bs 7079 part a2 preparation grades of previously coated steel substrates after.pdf

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Preparation of steel substrates before application of paints and related products Group A. Visuai assessment of surface cleanliness

Part A2. Preparation grades of previously coated steel substrates after localized removal of previous coatings

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

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BS 7079 : Part A2 : 1996

IS0 8501-2 : 1994

COPYRIGHT British Standards Institution on ERC Specs and StandardsLicensed by Information Handling ServicesCOPYRIGHT British Standards Institution on ERC Specs and StandardsLicensed by Information Handling Services

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National foreword

This Part of BS 7079 has been prepared by Technical Committee STlDl. It is identical with IS0 8501-2 : 1994 Pt,epa,ralim ofsteei substrates before applicutiwt of pnints arid related products - Visual assessment of surface cleanliness - Part 2: Prepa,ration

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(o IS0 1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. / Droits de reproduction rservs. Sauf prescription diffrente, aucune partie de cette publication ne peut &re reproduite ni utilise SOUS quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris Ia photocopie et les microfilms, sans l'accord crit de l'diteur.

International Organization for Standardization Case poctale 56 - CH-1211 Genve 20 * Switzerland

Printed in Swedenllmprim en Sude. 08 WeZata 1995 COPYRIGHT British Standards Institution on ERC Specs and StandardsLicensed by Information Handling ServicesCOPYRIGHT British Standards Institution on ERC Specs and StandardsLicensed by Information Handling Services

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IS0 8501-2:1994( E/F/R)

Foreword

I S 0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non- governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

International Standard IS0 8501-2 was prepared by Technical Committee ISOTTC 35, Paints and varnishes, Subcommittee SC 12, Preparation of steel substrates before application of paints and related products.

IS0 8501 consists at present of the following parts, under the general title Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness : - Pan 1: Rust grades and preparation grades of uncoated steel

substrates and of steel substrates afer overall removal of previous coatings.

- Informative Supplement to pan 1: Representative photographic examples of the change of appearance imparted to steel when blast- cleaned with different abrasives.

- Part 2: Preparation grades of previously coated steel substrates after localized removal of previous coatings.

- Part3: Preparation grades of welds, cut edges and surface imperfections.

Annexes A to J form an integral part of this part of IS0 8501.

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Avant-propos

L'ISO (Organisation internationale de normalisation) est une fdration mondiale d'organismes nationaux de normalisation (comits membres de I'ISO). L'laboration des Normes internationales est en gnral confie aux comits techniques de I'ISO. Chaque comit membre intress par une tude a le droit de faire partie du comit technique cr cet effet. Les organisations internationales, gouvernementales et non gouvernementales, en liaison avec I'ISO participent galement aux travaux. L'ISO collabore troitement avec la Commission lectrotechnique internationale (CEI) en ce qui concerne la normalisation lectrotechnique.

Les projets de Normes internationales adopts par les comits techniques sont soumis aux comits membres pour vote. Leur publication comme Normes internationales requiert l'approbation de 75 % au moins des comits membres votants.

La Norme internationale IS0 8501-2 a t labore par le comit technique ISOflC 35, Peintures et vernis, sous-comit SC 12, Prparation de subjectiles d'acier avant application de peintures et de produits assimils.

L'ISO 8501 comprend les parties suivantes, prsentes sous le titre gnral Prparation des subjectiles d'acier avant application de peintures et de produits assimils - valuation visuelle de la propret d'un subjectile ;

Partie 1: Degrs de rouille et degrs de prparation des subjectiles d'acier non recouverts et des subjectiles d'acier aprs dcapage sur toute la surface des revtements prcdents.

Supplment informatif la partie 1: Exemples de clichs reprsentatifs du changement d'aspect communiqu l'acier dcap avec des abrasifs diffrents.

Partie 2: Degrs de prparation des subjectiles d'acier prcdemment revtus aprs dcapage localis des couchas.

Partie3: Degrs de prparation des soudures, artes de coupe et imperfections de surface.

Les annexes A J font partie intgrante de la prsente partie de I'ISO 8501.

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INTERNATIONAL STANDARD IS0 8501-2:1994(E)

Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness -

Part 2: Preparation grades of previously coated steel substrates after localized removal of previous coatings

Introduction

The performance of protective coatings of paint and related products applied to steel is significantly affected by the state of the steel surface immediately prior to painting. The principal factors that are known to influence this performance are

a) the presence of rust and mill scale;

b) the presence of surface contaminants, including salts, dust, oils and greases;

c) the surface profile.

International Standards I S 0 8501, IS0 8502 and IS0 8503 have been prepared to provide methods of assessing these factors, while IS0 8504 provides guidance on the preparation methods that are available for cleaning steel substrates, indicating the capabilities of each in attaining specified levels of cleanliness.

These International Standards do not contain recommendations for the protective coating systems to be applied to the steel surface. Neither do they contain recommendations for the surface quality requirements for specific situations even though surface quality can have a direct influence on the choice of protective coating to be applied and on its performance. Such recommendations are found in other documents such as national standards

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and codes of practice. It will be necessary for the users of these International Standards to ensure that the qualities specified are

- compatible and appropriate both for the environmental conditions to which the steel will be exposed and for the protective coating system to be used;

- within the capability of the cleaning procedure specified.

The four International Standards referred to above deal with the following aspects of preparation of steel substrates:

IC0 8501 - Visual assessment of surface cleanliness;

IS0 8502 - Tests for the assessment ofsurface cleanliness;

IS0 8503 - Surface roughness characteristics of blast-cleaned steel substrates;

IS0 8504 - Surface preparation methods. Each of these International Standards is in turn divided into separate parts.

This part of IS0 8501 supplements IS0 8501-1. It identifies certain degrees of visual cleanliness (designated as "preparation grades") following surface preparation of steel surfaces after localized removal of previous paint coatings. These levels of visual cleanliness are related to the common methods of surface cleaning that are used prior to painting.

The photographic examples for preparation grades P Sa 2% and P Ma have been taken from DIN 55928, Part4, Supplement 1 (August 1978) and Supplement 2 (January 19861, respectively.

The basis of this part of IS0 8501 is the experience that complete removal of all previous paint coatings is not always necessary. This is especially true where maintenance work is carried out at regular intervals. For localized removal to be preferred, the following conditions should be fulfilled:

- the remaining intact coating should make a useful and durable contri- bution to the new corrosion protection system and be compatible with it;

- during cleaning of locally corroded areas down to the substrate, the coatings on the surrounding areas should not be irreparably or significantly damaged;

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- real savings in costs for the maintenance work should be made possible.

NOTE 1 This part of IS0 8501 contains the text in the three official languages of ISO, namely English, French and Russian. It also contains the following annexes giving the equivalent text in other languages, published under the responsibility of the respective bod y indicated:

Annex A: Swedish (SIS)

Annex B: German (DIN)

Annex C: Dutch ("I)

Annex D: Italian (UNI)

Annex E: Spanish (AENOR)

Annex F: Portuguese (IPQ)

Annex G: Arabic (CASO)

Annex H: Japanese (JISC)

Annex J: Chinese (CSBTSI


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1 Scope

This part of IS0 8501 specifies a series of preparation grades for steel surfaces after localized removal of previous paint coatings The various preparation grades are defined by written descriptions (see clause 4) together with the representative photographic examples given in IS0 8501-1. In ad- dition, photographs showing examples of preparation grades P Sa 2% and P Ma are given.

This part of IS0 8501 is applicable to surfaces prepared for painting by methods such as blast-cleaning, hand- and power-tool cleaning, and machine abrading.

This part of IS08501 relates the cleanliness of a surface to its visual appearance. In many instances this is sufficient, but for coatings likely to be exposed to severe environments, such as water immersion and continuous condensation conditions, consideration should be given to testing for soluble salts and other invisible contaminants on the visually clean surface by the physical and chemical methods which form the subjects of the various parts of IS0 8502. The roughness characteristics of the surface should also be considered by reference to IS0 8503.

2 Normative references

The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 8501. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS08501 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards.

IS0 2409:1992, Paints and varnishes - Cross-cut test.

IS0 4624:1978, Paints and varnishes - Pull-o17 test for adhesion. IS0 4627:1981, Paints and varnishes - Evaluation of the compatibility of a product with a surface to be painted - Methods of test.

IS0 4628-1:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 1: General principles and rating schemes.

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IS0 4628-2:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 2: Designation of degree of blistering.

IS0 4628-3:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 3: Designation of degree of rusting.

IS0 4628-4:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 4: Designation of degree of cracking.

IS0 4628-5:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 5: Designation of degree of flaking.

IS0 4628-6:1990, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - far t 6: Rating of degree of chalking by tape method.

I S 0 8501-1:1988, Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part I : Rust grades and preparation grades of uncoated steel substrates and steel substrates after overall removal of previous coatings.

3 Condition of the painted surface to be cleaned

The degrees of degradation which may be found on previously coated surfaces shall be assessed in accordance with IS0 4628, parts l to 6.

i f possible, supplementary information about the previous coating, concern- ing the generic type, number of coats applied, manufacturer's name, cor- rosive contaminants, adhesion and film thickness, shall be given.

4 Preparation grades

4.1 General

A number of preparation grades, indicating the method of surface preparation and the degree of cleariing, are specified. The preparation grades are defined (see 4.2, 4.3 and 4.4) by written descriptions of the surface appearance after the cleaning operation.


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Each preparation grade is designated by the appropriate letters "Sa", "St" or "Ma" to indicate the type of cleaning method used. The letter P before Sa, St or Ma indicates only localized removal of previous paint coatings. The number following, if any, indicates the degree of cleaning from mill scale, rust and previous coatings.

It should be realized that the various methods of cleaning do not give com- parable results. The degree of cleaning shall be compatible with the generic type of coating system to be used for recoating.

Reference is made in 4.2 and 4.3 to the photographs in IS0 8501-1 which are representative photographic examples of preparation grades.

NOTES

2 The term "foreign matter" used in 4.2, 4.3 and 4.4 includes water-soluble salts and residues from welding flux. These contaminants cannot be completely removed from the surface by dry blast-cleaning, hand- or power-tool cleaning or machine abrading; wet blast-cleaning can be used.

3' Mill scale, rust or a paint coating is considered to be poorly adhering if it can be removed by lifting with a blunt putty knife.

4 The photographic representations appended to this part of IS0 8501 show some typical examples of steel prior to and after localized cleaning.

4.2 Localized blast-cleaning of previously coated surfaces, P Sa

Surface preparation by localized blast-cleaning is designated by the letters "P Sa".

Prior to blast-cleaning, any heavy layers of rust shall be removed by chipping. Visible oil, grease and dirt shall also be removed.

After blast-cleaning, loose dust and debris shall be cleaned from the surface.

NOTE 5 For descriptions of surface preparation methods by blast-cleaning, including treatment prior to and after the blast-cleaning procedure, see IS0 8504-2.

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P Sa 2 Thorough localized blast-cleaning Firmly adhering paint coatings shall be intact. The surface of the other parts, when viewed without magnification, shall be free from visible oil, grease and dirt, from loose paint coatings and from most of the mill scale, rust and foreign matter. Any residual contamination shall be firmly adhering (see note 3 to 4.1). For comparison, see photographs C Sa 2 and D Sa 2 given in IS0 8501-1. The choice depends on the degree of pitting.

P Sa 2% Very thorough localized blasttleaning Firmly adhering paint coatings shall be intact. The surface of the other parts, when viewed without magnification, shall be free from visible oil, grease and dirt, from loose paint coatings and from mill scale, rust and foreign matter. Any remaining traces of contamination shall show only as slight stains in the form of spots or stripes. For comparison, see photographs C Sa 2% and D Sa 2% given in IS0 8501-1. The choice depends on the degree of pitting.

Photographs showing examples of preparation grade P Sa 2% are appended to this part of IS0 8501.

P Sa 3 Localized blast-cleaning to visually clean steel Firmly adhering paint coatings shall be intact. The surface of the other parts, when viewed without magnification, shall be free from visible oil, grease and dirt, from loose paint coatings and from mill scale, rust and foreign matter. It shall have a uniform metallic colour. For comparison, see photographs C Sa 3 and D Sa 3 given in IS0 8501-1. The choice depends on the degree of pitting.

NOTE 6 Preparation grade P Sa 1 is not included as it would correspond to a surface unsuitable for painting.

4.3 Localized hand- and power-tool cleaning') of previously coated surfaces, P St

Surface preparation by localized hand- and power-tool cleaning, such as scraping, brushing and grinding, is designated by the letters "P St"

Prior to hand- and power-tool cleaning, any layers of rust shall be removed by chipping. Visible oil, grease and dirt shall also be removed.

1) Except machine abrading, see 4.4.


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After hand- and power-tool cleaning, loose dust and debris shall be cleaned from the surface.

NOTE 7 For descriptions of surface preparation methods by hand- and power-tool cleaning, including treatment prior to and after the hand-power-tool cleaning procedure, see IS0 8504-3.

P St 2 Thorough localized hand- and power-tool cleaning Firmly adhering paint coatings shall be intact. The surface of the other parts, when viewed without magnification, shall be free from visible oil, grease and dirt and from poorly adhering mill scale, rust, paint coatings and foreign matter (see note 3 to 4.1). For comparison, see photographs C S t 2 and D S t 2 given in IS0 8501-1. The choice depends on the degree of pitting.

P St 3 Very thorough localized hand- and power-tool cleaning As for P St 2, but the surfaces to be cleaned shall be treated much more thoroughly to give a metallic sheen arising from the metallic substrate. For comparison, see photographs C Ct 3 and D St 3 given in IS0 8501-1. The choice depends on the degree of pitting.

NOTES

8 Preparation grades P St 2 and P St 3 are not associated in any way with the use of particular hand- or power-tools, but are determined solely by the preparation grade definitions interpreted with the help of the representative photographic examples.

9 Preparation grade P St 1 is not included as it would correspond to a surface unsuitable for painting.

4.4 Localized machine abrading of previously coated surfaces, P Ma

Surface preparation by localized machine abrading is designated by the letters "P Ma". It comprises cleaning by thorough machine abrading (for example by disc with abrasive paper) or by special rotating wire brushes, which may be used in conjunction with needle guns.

Prior to machine abrading, any heavy layers of rust shall be removed by chipping. Visible oil, grease and dirt shall also be removed.

After machine abrading, the surface shall be cleaned from loose dust and debris.

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P Ma Localized machine abrading

Firmly adhering paint coatings shall be intact. The surface of the other parts, when viewed without magnification, shall be free from visible oil, grease and dirt, from loose paint coatings and foreign matter (see note 2 to 4.1) and from mill scale and rust. Any remaining traces of contamination shall show only as slight stains in the form of spots or stripes. For comparison, photographs showing examples of preparation grade P Ma are appended to this part of I S 0 8501.

NOTE 10 Preparation grade P Ma is not associated in any way with the use of particular tools, but is determined solely by the preparation grade defirrition, interpreted with the help of the representative photographic example.

4.5 Treatment of remaining coatings

Prior to the application of further coatings, the remaining parts of the existing coatings, including any primers and undercoats that are firmly adhering after the surface preparation procedure, shall be freed from loose material and contaminants, if necessary, and roughened to ensure satisfactory adhesion. The adhesion of the remaining paint coating may be checked with a knife, by a cross-cut test in accordance with IS0 2409, by a portable apparatus for pull- off adhesion testing in accordance with IS0 4624, or by other suitable means.

Existing sound coatings adjacent to abraded or blast-cleaned areas shall be bevelled (feathered back) to give sound and firmly adhering edges. It is also imperative that subsequent coatings be compatible with the remai ni ng coatings. Advice on assessing compatibility is given in IS0 4627.

5 Photographs

The representative photographic examples given in this part of IS0 8501 are typical of the general appearance of areas before and after localized preparation prior to recoating (magnification between x5 and x6). For ease of manufacture, the plastic sheets on which the photographs have been reproduced do not carry page numbers. For convenience in use, the photographs are displayed in the order shown in figure 1. On each page, the


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upper photograph shows the surface condition before and the lower photograph the surface condition after surface preparation.

Detailed descriptions of the prepared areas are given in 5.1 to 5.3.

5.1 Typical cases of very thorough localized blast-cleaning (P Sa 2%)

The two pairs of photographs given in the first and second photographic plates and described in 5.1.1 and 5.1.2 illustrate two typical cases encountered in practice.

5.1.1 Iron oxide shop primer (first photographic plate)

These photos show a surface with a red iron oxide shop primer before and after the blast-cleaning procedure. On the left-hand side of the photo, a rusted weld joint is visible, while the upper right-hand side shows rusted weld runs.

5.1.2 Corrosion protection system (second plate)

These photos show a surface with a corrosion protection system (red lead/micaceous iron oxide), which has been exposed for a long period, before and after the blast-cleaning procedure. In the upper photo, wide- spread rusty regions and regions of sound coating can be seen. Before complete recoating of the surface, the regions of sound coating would have to be cleaned and roughened.

5.2 Extreme cases of very thorough localized blast-cleaning (P Sa 2%)

The two pairs of photographs given in the third and fourth photographic plates and described in 5.2.1 and 5.2.2 show extreme examples of the broad range of possibilities for application of preparation grade P Sa 2%.

5.2.1 A sound coating (third plate)

These photos show localized blast-cleaning of corroded spots on areas showing a generally sound coating that required only partial repair and which could also have been prepared by abrading or scraping and brushing the deteriorated areas.

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5.2.2 An unsuitable coating (fourth plate)

These photos show a coating that will have to be recoated completely in spite of only insignificant visible rust stains. Overall removal of the coating to preparation grade Sa 2% should also be considered.

5.3 Typical cases of localized machine abrading (P Ma)

The three pairs of photographs given on the fifth, sixth and seventh photographic plates and described in 5.3.1 and 5.3.2 illustrate three typical cases encountered in practice.

5.3.1 Repair work

5.3.1.1 Upper sides of a hatch cover (fifth plate)

These photos show a corrosion protective system, approximate age 15 years, applied by brush, consisting of two priming coats (orange and brown) based on red lead, followed by two grey finishing coats based on synthetic resin. Weathering of the coating system in the brush marks is clearly visible in the upper photo, because the surface has already been cleaned by steam jet.

The surface is shown before and after further preparation (derusting of the rusted areas by machine abrading using a disc followed by brushing of the surface).

5.3.1.2 Upper side of a steel girder (sixth plate)

These photos show a corrosion protection system, age unknown, consisting of two priming coats (orange and brown), followed by two grey finishing coats based on synthetic resin. The surface also has local mechanical damage.

The surface is shown before and after preparation (derusting of the rusted areas by machine abrading using a disc, followed by brushing of the surface).

5.3.2 New-construction work: Tubes in a power station (seventh plate)

Before assembly, all outer surfaces of the tubes were blast-cleaned to preparation grade Sa 2H, except in the region of weld joints, then coated with two


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priming coats based on epoxy resin/zinc chromate (reddish-brown), followed by two intermediate coats based on epoxy resin (red/orange).

The surface of one tube is shown before and after further preparation (derusting of rusted areas and the weld-joint region by machine abrading, followed by brushing and removal of any remaining impurities).

P Sa 2% P Sa 2H

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see 5.2.1 see 5.2.2

see 5.3.2

r- Figure 1 - Layout and sequence of the representative photographic

examples appended to this part of IS0 8501

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NORME INTERNATIONALE IS0 8501-2:1994(F)

Prparation des subjectiles d'acier avant application de peintures et de produits assimils - valuation visuelle de la propret d'un subjectile - Partie 2: Degr de prparation des subjectiles d'acier prcdemment revtus aprs dcapage localis des couches

Introduction

L'efficacit des revtements de peinture et produits assimils de protection appliqus sur de l'acier est nettement affecte par l'tat du subjectile juste avant l'application de la peinture. Les principaux facteurs connus affectant cette efficacit sont

a) la prsence de rouille et de calamine;

b) la prsence d'agents contaminants de surface, tels que sels, pous- sires, huiles, graisses;

c) le profil de surface.

Les Normes internationales I S 0 8501, IS0 8502 et IS0 8503 ont t labores afin de fournir des mthodes pour valuer ces facteurs, alors que I'ISO 8504 fournit des directives sur les mthodes de prparation existantes pour le nettoyage des subjectiles d'acier, avec les possibilits de chacune de par- venir aux niveaux de propret prescrits.

Ces Normes internationales ne proposent aucune recommandation pour les systmes de revtement de protection appliquer sur le subjectile d'acier. Elles ne proposent pas non plus de recommandations quant aux exigences sur ia qualit du subjectile dans des cas particuliers, bien que ce facteur puisse avoir une influence directe sur le revtement appliquer et sur son efficacit. On trouvera de telles recommandations dans d'autres documents


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tels que les normes nationales ou les codes d'utilisation. II conviendra que les utilisateurs de ces Normes internationales s'assurent que les qualits prescrites sont

- compatibles et adaptes tant l'environnement auquel le subjectile sera expos qu'aux revtements de protection utiliser;

- dans les limites des possibilits du mode de nettoyage prescrit.

Les quatre Normes internationales auxquelles il est fait rfrence ci-dessus traitent des aspects suivants de la prparation des subjectiles d'acier:

IS0 8501 - valuation visuelle de la propret d'un subjectile;

IS0 8502 - Essais pour l'valuation de la propret d'un subjecrile;

IS0 8503 - Caractristiques de rugosit des subjectiles d'acier dcaps;

IS0 8504 - Mthodes de prparation des surfaces.

Chacune de ces Normes internationales est son tour divise en parties spares.

La prsente partie de I'ISO 8501 complte I'ISO 8501-1. Elle identifie un certain nombre de degrs d'valuation visuelle (dsigns comme degrs de prparation))) aprs prparation de surface des subjectiles d'acier aprs dcapage localis des couches de peinture prcdentes. Les niveaux d'valuation visuels dpendent des mthodes courantes de nettoyage de surface utilises avant le peinturage.

Les clichs photographiques des degrs de prparation P Sa 2% et P Ma sont repris respectivement du supplment 1 (aot 1978) et du supplment 2 (janvier 1986) la norme DIN 55 928, partie 4.

La prsente partie de IWO. 8501 se base sur l'exprience selon laquelle un revtement complet des couches de peinture prcdentes n'est pas toujours ncessaire. Cela est particulirement vrifi dans le cas o les travaux d'entretien sont effectus intervalles rguliers. Lorsqu'on prfre I'enlvement localis, les conditions suivantes doivent tre runies:

- la couche qui demeure intacte doit contribuer utilement et durable- ment au nouveau systme anticorrosion et tre compatible avec lui;

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- durant le dcapage des plages corrodes jusqu'au subjectile, les revtements des plages adjacentes ne doivent pas tre irrmdiablement endommags;

- une relle conomie devrait tre ralise pour les travaux d'entretien.

NOTE 1 La prsente partie de I'ISO 8501 est rdige dans les trois langues officielles de I'ISO, savoir anglais, franais et russe. Elle contient galement les annexes suivantes donnant le texte quivalent dans d'autres langues, publi sous la responsabilit du comit respectif indiqu:

Annexe A sudois (SIS)

Annexe 6: allemand (DIN)

Annexe C: nerlandais ("I)

Annexe D: italien (UNI)

Annexe E: espagnol (AENOR)

Annexe F: portugais (IPQ)

Annexe G: arabe (SASOI

Annexe H: japonais (JISC)

Annexe J: chinois (CSBTS)


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1 Domaine d'application

La prsente partie de I'ISO8501 dcrit une srie de degrs de prparation des subjectiles d'acier aprs dcapage localis des couches de peinture prcdentes (voir article 4). Les diffrents degrs de prparation font l'objet d'une description crite avec rfrence aux clichs photographiques donns dans I'ISO 8501-1. De plus, on trouvera des clichs-types pour les degrs de prparation P Sa 2M et P Ma.

La prsente partie de I'ISO 8501 est applicable la prparation des surfaces peindre l'aide de mthodes telles que dcapage, nettoyage la main ou la machine et dcapage la machine. La prsente partie de I'ISO 8501 tablit un rapport entre la propret du subjectile et son aspect l'il nu. Cela est suffisant dans de nombreux cas, mais pour des revtements susceptibles d'tre exposs des conditions ambiantes rigoureuses, telles que I'immersion dans l'eau ou la condensation permanente, il faudra veiller faire des essais pour les sels solubles et autres facteurs contaminants invisibles sur une surface apparemment propre l'aide de mthodes physiques et chimiques qui feront l'objet des diffrentes parties de I'ISO 8502. Les caractristiques de rugosit du subjectile devraient galement tre tudies en rfrence I'ISO 8503.

2 Rfrences normatives

Les normes suivantes contiennent des dispositions qui, par suite de la rfrence qui est en faite, constituent des dispositions valables pour la prsente partie de I'ISO 8501. Au moment de la publication, les ditions indiques taient en vigueur. Toute norme est sujette rvision et les parties prenantes des accords fonds sur la prsente partie de I'ISO8501 sont invites rechercher la possibilit d'appliquer les ditions les plus rcentes des normes indiques ci-aprs. Les membres de la CE1 et de I'ISO possdent le registre des Normes internationales en vigueur un moment donn.

IS0 2409:1992, Peintures et vernis - Essais de quadrillage.

IS0 4624:1978, Peintures et vernis - Essai de traction.

IS0 4627:1981, Peintures et vernis - valuation de la compatibilit d'un produit avec la surface peindre - Mthodes d'essai.

IS0 4628-1:1982, Peintures et vernis - valuation de la dgradation des surfaces peintes - Dsignation de l'intensit, de la quantit et de la dimension

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des types courants de dfauts - Partie 7: Principes gnraux et modes de cotation.

IS0 4628-2:1982, Peintures et vernis - valuation de la dgradation des surfaces peintes - Dsignation de l'intensit, de la quantit et de la dimension des types courants de dfauts - Partie 2: Dsignation du degr de cloquage.

IS0 4628-3: 1982, Peintures et vernis - valuation de la dgradation des surfaces peintes - Dsignation de l'intensit, de la quantit et de la dimension des types courants de dfauts - Partie 3: Dsignation du degr d'enrouille- ment.

IS0 4628-4:1982, Peintures et vernis - valuation de la dgradation des surfaces peintes - Dsignation de l'intensit, de la quantit et de la dimension des types courants de dfauts - Partie 4: Dsignation du degr de craque- lage.

IS0 4628-5:1982, Peintures et vernis - Evaluation de la dgradation des surfaces peintes - Dsignation de l'intensit, de la quantit et de la dimension des types courants de dfauts -Partie 5: Dsignation du degr d'caillage.

IS0 4628-6:1990, Peintures er vernis - valuation de la dgradation des surfaces peintes - Dsignation de l'intensit, de la quantit et de la dimension des types courants de dfauts - Partie 6: Cotation du degr de farinage par la mthode du ruban adhsif

I C 0 8501-1:1988, Prparation des subjectiles d'acier avant application de peinture et de produits assimils - valuation visuelle de la propret d'un subjectile - Partie I : Degrs de rouille et degrs de prparation des subjectiles d'acier non recouverts et des subjectiles d'acier aprs dcapage sur toute la surface des revtements prcdents.

3 tat des surfaces peintes nettoyer

Les tats de dgradation qu'on peut rencontrer sur des surfaces dj revtues seront valus conformment I'ISO 4628, parties 1 6.

Dans la mesure du possible, on donnera des dtails supplmentaires sur le type gnrique du revtement prcdent, le nombre de couches appliques, le nom du fabricant, les facteurs de corrosion, l'adhrence et l'paisseur de la couche.


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4 Degrs de prparation

4.1 Gnralits

Un certain nombre de degrs de prparation est prescrit en indiquant la mthode de prparation de surface et le degr de nettoyage. Les degrs de prparation sont dfinis (voir 4.2, 4.3 et 4.4) en dcrivant par crit l'aspect de la surface aprs le nettoyage.

Chaque degr de prparation est dsign par les lettres appropries Sa, St ou Ma qui indiquent la mthode de nettoyage utilise. La lettre P avant Sa, St ou Ma indique un enlvement seulement localis des couches prcdentes. Le chiffre qui suit ventuellement la lettre indique le degr de nettoyage de la calamine, de la rouille et des couches prcdentes.

II convient de raliser que les diverses mthodes de nettoyage ne donnent pas des rsultats comparables. Le degr de nettoyage doit tre compatible avec le type gnrique du systme de revtement utiliser pour la sur- couche.

Il est fait rfrence en 4.2 et 4.3 aux photographies contenues dans I'ISO 8501-1 qui sont des exemples photographiques reprsentatifs des degrs de prparation.

NOTES

2 Le terme matire trangre)) utilis en 4.2, 4.3 et 4.4 peut inclure des sels solubles dans l'eau et des rsidus de soudage. Ces agents contaminants ne peuvent tre totalement limins du subjectile par dcapage sec, nettoyage la main ou la machine, ou dcapage la machine; il est possible d'effectuer un dcapage sous eau.

3 La calamine, la rouille ou une couche de peinture sont considrs comme peu adhrentes si elles peuvent tre souleves l'aide d'un couteau palette point.

4 La reprsentation photographique annexe la prsente padie de I'ISO 8501 donne quelques exemples-types d'acier avant et aprs nettoyage localis.

4.2 Dcapage localis de subjectiles revtus, P Sa

La prparation de surface par dcapage localis est dsigne par les lettres UP Sa.

Avant le dcapage, toutes les couches paisses de rouille doivent tre limines par martelage. II faut galement liminer l'huile, la graisse ou les salissures visibles.

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Aprs le dcapage, le subjectile devra tre dbarrass de la poussire volatile et des dbris.

NOTE 5 Pour une description des mthodes de prparation des subjectiles par dcapage, y compris le traitement avant et aprs le dcapage proprement dit, voir IS0 8504-2.

P Sa 2 Dcapage localis soigne

Les couches de peinture bien adhrentes doivent tre intactes. La surface des autres parties, examines l'il nu, doit tre exempte de traces visibles d'huile, de graisse ou de poussire, de dbris et du maximum de calamine, de rouille et de matire trangre. Toute contamination rsiduelle doit bien adhrer (voir 4.1, note 3). Pour comparaison, voir photographies C Sa 2 et D Sa 2 annexes I'ISO 8501-1. Le choix dpend du degr des piqres.

P Sa 2% Dcapage localis trs soign

Les couches de peinture bien adhrentes doivent tre intactes. La surface des autres parties, examines l'il nu, doit tre exempte de traces visibles d'huile, de graisse ou de poussire, de dbris de calamine et de matire trangre. Les agents contaminants ne doivent laisser que de lgres traces sous forme de taches ou de tranes. Pour comparaison, voir photographies C Sa 2% et D Sa 2H annexes I'ISO 8501-1. Le choix dpend du degr des piqres.

Des photographies illustrant le degr de prparation P Sa 2M sont annexes la prsente partie de I'ISO 8501.

P Sa 3 Dcapage localis jusqu' apparition du mtal

Les couches de peinture bien adhrentes doivent tre intactes. La surface des autres parties, examines l'il nu, doit tre exempte de traces visibles d'huile, de graisse ou de poussire, de dbris et de calamine, de rouille et de matire trangre. Elle doit prsenter un clat mtallique uniforme. Pour comparaison, voir photographies C Sa 3 et D Sa 3 annexes I'S0 8501-1. Le choix dpend du degr des piqres.

NOTE 6 Le degr de prparation P Sa 1 n'est pas inclus dans la mesure o il correspond une surface impropre l'application de la peinture.


IS0 8501-2:1994(F)

4.3 Nettoyage localis a la main ou la machinel) de surfaces pralablement revtues, P St

La prparation des surfaces par nettoyage localis la main ou la machine, par exemple au grattoir et la brosse mtallique, la ponceuse mcanique et la meule, est dsigne par les lettres P St.

Avant le nettoyage la main ou la machine, les couches paisses de rouille doivent tre limines par martelage. II faut galement liminer l'huile, la graisse ou les salissures visibles.

Aprs le nettoyage la main ou la machine, le subjectile devra tre dbarrass de la poussire volatile et des dbris.

NOTE 7 Pour une description des mthodes de prparation des subjectiles par nettoyage la main ou la machine, y compris le traitement avant et aprs le nettoyage proprement dit, voir IS0 8504-3.

P St 2 Nettoyage localis soign la main ou la machine Les couches de peinture bien adhrentes doivent tre intactes. La surface des autres parties, examines l'il nu, doit tre exempte de traces visibles d'huile, de graisse ou de poussire, de calamine, de rouille, des couches prcdentes et de matire trangre peu adhrentes (voir 4.1, note 3). Pour comparaison, voir photographies C St 2 et D St 2 annexes I'ISO 8501-1. Le choix dpend du degr des piqres.

P St 3 Nettoyage localis6 trs soign la main ou la machine Nettoyage identique P St 2, mais les surfaces nettoyer doivent tre traites avec plus de soin de sorte que le subjectile d'acier prenne un clat mtallique. Pour comparaison, voir photographies C St 3 et D St 3 annexes I'ISO 8501-1. Le choix dpend du degr des piqres.

NOTES

8 Les degrs de prparation P St 2 et P St 3 ne sont associs en aucune faon avec l'emploi d'outils manuels ou de machines particuliers, mais il sont dtermins seulement par les dfinitions des degrs de prparation que l'on interprte l'aide des clichs photographiques reprsentatifs.

9 Le degr de prparation P St 1 n'est pas mentionn dans la prsente partie de I'ISO 8501 car il correspond un tat de surface impropre au peinturage.

1) Sauf le dcapage la machine, voir 4.4.

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4.4 Dcapage localis la machine de surfaces pralablement revtues, P M a

La prparation de surface par dcapage localis la machine est dsigne par les lettres P Ma. II s'agit d'un nettoyage l'aide d'une machine abraser (par exemple un disque avec du papier abrasif) ou l'aide d'une brosse mtallique rotative reposant sur un support adquat.

Avant le dcapage la machine, toutes les couches paisses de rouille doivent tre limines par martelage. II faut galement liminer l'huile, la graisse ou les salissures visibles.

Aprs le dcapage la machine, le subjectile devra tre dbarrass de la poussire volatile et des dbris.

P Ma Dcapage localis la machine Les couches de peinture bien adhrentes doivent tre intactes. La surface des autres parties, examines l'il nu, doit tre exempte de traces visibles d'huile, de graisse ou de poussire, de particules des couches prcdentes et de matire trangre (voir 4.1, note 21, de rouille et de calamine. Les agents contaminants ne doivent laisser que de lgres traces sous forme de taches et de tranes. Pour comparaison, voir photographies P Ma annexes la prsente partie de I'ISO 8501.

NOTE 10 Le degr de prparation P Ma n'est associ en aucune faon avec l'emploi d'outils particuliers, mais il est dtermin seulement par la dfinition du degr de prparation que l'on interprte l'aide du clich photographique reprsentatif.

4.5 Traitement des couches restantes

Avant l'application des couches suivantes, les parties restantes des couches anciennes, y compris les primaires d'atelier et les sous-couches qui adhrent solidement aprs la prparation de surface, ne doivent pas prsenter de dbris et d'agents contaminants et peuvent tre grattes pour assurer une bonne adhsion. On peut apprcier l'adhrence de la peinture restante l'aide d'un couteau, par exemple en effectuant l'essai de quadrillage conformment I'ISO 2409, ou en effectuant l'essai de traction l'aide d'un appareil portable conforme I'ISO 4624 ou par tout autre moyen appropri.

Le raccordement entre les plages recouvertes de peinture saine et celles qui ont t dcapes doit se faire progressivement. II est galement impratif


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que les couches successives soient compatibles avec les couches existantes. En ce qui concerne la compatibilit, voir IS0 4627.

5 Photographies

Les clichs photographiques reprsentatifs annexs la prsente partie de 1'1SO8501 sont typiques de l'aspect gnral de surfaces avant et aprs la prparat;ion localise avant le peinturage (grossissement x 5 et x 6). Pour faciliter la fabrication, les feuillets plastiques au verso desquels sont reproduits les photographies ne sont pas pagins. Pour faciliter l'utilisation, les photographies sont disposes dans l'ordre indiqu la figure 1. Sur chaque planche, la photographie du haut illustre l'tat de surface avant dcapage et celle du bas l'tat de surface aprs dcapage.

Les descriptions dtailles des surfaces prpares sont donnes en 5.1 5.3.

5.1 Exemples types d'un dcapage localis trs soign (P Sa 2%)

Les quatre clichs des deux premires planches de photographies, dcrits en 5.1.1 et 5.1.2, illustrent deux cas types rencontrs dans la pratique.

5.1.1 Primaire d'atelier l'oxyde de fer (premire planche)

Ces photos montrent un subjectile recouvert d'un primaire d'atelier l'oxyde de fer rouge avant et aprs le dcapage. Un cordon de soudure rouill est visible gauche du clich ainsi qu' droite des traces de soudures rouilles.

5.1.2 Systme de protection contre la corrosion (deuxime planche)

Ces photos montrent un subjectile revtu d'un systme de protection contre la corrosion (minium/oxyde de fer micac), expos pendant une longue priode avant et aprs le dcapage. De grandes plages rouilles alternent avec des plages de revtement sain. En cas de peinturage complet du subjectile, les parties saines devront tre nettoyes et grattes.

5.2 Cas extrmes d'un dcapage localis trs soign (P Sa 2%)

Les quatre clichs des troisime et quatrime planches de photographies, dcrits en 5.2.1 et 5.2.2, montrent les limites du large ventail des possibilits pour l'application du degr de prparation P Sa 2M.

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5.2.1 Revtement sain (troisime planche)

Ces photos montrent un dcapage localis de parties corrodes sur les plages prsentant en gnral un revtement sain refaire en partie et qui aurait pu galement tre prpar par abrasion, grattage ou brossage des parties abmes.

5.2.2 Revtement impropre (quatrime planche)

Ces photos montrent un revtement qui doit tre compltement refait en dpit de quelques points de rouille insignifiants sur le revtement. II convient de se demander si un enlvement total selon le degr de prparation Sa 2% est ncessai re.

5.3 Cas type de dcapage localis la machine (P Mal

Les six clichs des cinquime, sixime et septime planches de photographies, en 5.3.1 et 5.3.2, illustrent trois cas types rencontrs dans la pratique.

5.3.1 Rparations

5.3.1.1 Cts suprieurs d'un panneau de descente (cinquime planche)

Ces photos montrent un systme de protection appliqu la brosse, d'une anciennet d'environ 15 ans, consistant en deux couches primaires (orange et marron) base minium, suivies de deux couches de finition grises base de rsine synthtique. La tenue aux intempries du systme de protection est nettement visible sur la photo du haut, car la surface a dj t nettoye par sablage avant le dcapage localis.

La surface est vue avant et aprs les travaux de prparation (enlvement de la rouille sur les zones rouilles par abrasion avec un disque, suivie de brossage de la surface).

5.3.1.2 Cts suprieurs d'une poutrelle d'acier (sixime planche)

Ces photos montrent un systme de protection contre la corrosion, d'anciennet inconnue, consistant en deux couches primaires (orange et marron) suivies de deux couches de finition grises base de rsine synthtique. Ces dtriorations localises de la surface sont dues des causes d'origine m- canique.


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La surface est vue avant et aprs les travaux de prparation (enlvement de la rouille sur les zones rouilles par abrasion avec un disque, suivie de brossage de la surface).

5.3.2 Ouvrage de construction neuf tubes de centrale (septime planche)

Avant assemblage, toutes les surfaces extrieures des tubes ont t dcapes un degr de prparation Sa 2H, except proximit des joints souds, puis elles ont t prpeintes avec deux couches primaires base de rsine poxy/chromate de zinc (brun rougetre), suivies de deux couches intermdiaires base de rsine poxy (rouge/orange).

La surface est vue avant et aprs les travaux de prparation subsquents (enlvement de la rouille sur les zones rouilles et prs des soudures par abrasion, suivie de brossage et limination des impurets restantes).

voir 5.2.2 P Sa 2H n

i $ L voir 5.3.1.1 voir 5.3.1.2 I /,T voir 5.3.2 Figure 1 - Disposition et ordre de prsentation des clichs photographiques

reprsentatifs annexs la prsente partie de I'ISO 8501


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Svensk IS0 8501-2:1994 Annex A Annexe A IlpMnoxeHMe A

Behandling av stlytor fre belggning med mlningsfrg och liknande produkter - Visuell utvrdering av ytrenhet - Del 2: Frbehandiingsgrader fr tidigare beiagda stiytor efter lokait avigsnande av tidigare mlningsfrg

Inledning

Skyddsfrmgan hos mlningsfrg p stl pverkas i hg grad av stlytans tillstnd omedelbart fre mlning. De huvudsakliga faktorer som man vet pverkar resultatet r

a) frekomst av rost och valshud;

b) frekomst av ytfroreningar, inklusive salter, damm oljor och fetter;

c) ytrhet.

I verensstmmelse harmed har IS0 8501, IS0 8502 och IS0 8503 ut-arbetats i avsikt att ge metoder fr bestmning av dessa faktorer, medan IS0 8504 ger ledning betrffande tillgngliga frbehandlingsmetoder fr rengring av stl och om mjligheten att uppn freskrivna renhetsniver med var och en av dessa.

Dessa internationella standarder innehller inga rekommendationer om vilka rostskyddssystem som skall anvndas fr stlytan. Inte heller innehller de ngra rekommendationer om ytkvalitetskrav i enskilda fall, trots att ytkvaliteten kan ha en avgrande betydelse fr valet av skyddsbelggning och fr dennas skyddsfrmga. Sdana rekommendationer terfinns i andra dokument ssom nationella standarder och anvisningar. Det ankommer p anvndaren av dessa internationella standarder att skerstlla att freskriven kva I itet


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- r frenlig med och Irnplig fr de miljmssiga frhllanden, som stlet komrner att utsttas fr och fr det rostskyddssystern som skall anvndas;

- kan uppns med den freskrivna rengringsproceduren.

De ovannmnda fyra internationella standarderna behandlar fljande:

IS0 8501, Visuell utvrdering av ytrenhet;

IS0 8502, Prov fr utvrdering av ytrenhet;

IS0 8503, Karakterisering av ytrhet hos blstrat stl;

IS0 8504, Frbehandlingsmetoder fr ytor.

Var och en av dessa internationella standarder r i sin tur uppdelad i fristende delar.

Denna del av IS0 8501 kompletterar I S 0 8501-1. Den beskriver vissa grader av visuell renhet (benrnnda "frbehandlingsgrader') eter frbehandling av stlytor sedan rester av tidigare frgskikt lokalt avlgsnats. Dessa niver av visuell renhet r knutna till de ytrengringsrnetoder vilka vanligtvis anvnds fre mlning.

De fotografiska exemplen pa frbehandlingsgraderna P Sa 2% och P Ma r tagna ur DIN 55 928, Part 4, Supplement 1 (augusti 1978) respektive Supplement 2 (januari 1986).

Grunden fr denna del av IS0 8501 r erfarenheten att fullstndigt avlgsnande av tidigare frgskikt inte alltid r ndvndigt. Detta gller i synnerhet nr underhll grs med regelbundna intervall. Om det skall vara ngon frdel med att bara lokalt avlgsna tidigare frbskikt br fljande villkor vara uppfyllda:

- den terstende intakta rnlningsfrgen br utgra ett anvndbart och bestende bidrag till det nya rostskyddssysternet och vara frenlig med detta;

- vid rengring ner till underlaget av lokalt rostiga ytor, far orngivande ytors rnlningsfrg inte skadas p ett oreparerbart eller avgrande stt;

- ptagliga kostnadsbesparingar fr underhllet skall mjliggras.

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1624667 0535817 378 = IS0 8501-2~1994

Annex A Annexe A npmoxeme A

ANM 1 Denna del av IS0 8501 innehller text p ISOs tre officiella sprk, nmligen engelska, franska och ryska. Den innehller ocks fljande bilagor (Annex) med motsvarande text p andra sprk, publicerade p respektive medlemsorgans ansvar.

Annex A: Svenska (SIS)

Annex 6: Tyska (DIN)

Annex C: Hollndska ("1)

Annex D: Italienska (UNI)

Annex E: Spanska (AENOR)

Annex F: Portugisiska (IPQ)

Annex G: Arabiska (SASO)

Annex H: Japanska (JISC)

Annex J: Kinesiska (CSBTS)


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1 Omfattning

Denna del av IS0 8501 anger en serie frbehandlingsgrader fr stlytor efter lokalt avlgsnande av tidigare frgskikt. De olika graderna definieras genom beskrivningar i ord (se avsnitt 4) tillsammans med de representativa fotografiska exemplen, som ges i IS0 8501-1. Dessutom visas fotografiska exempel p frbehandlingsgraderna P Sa 2% och P Ma.

Denna del av IS0 8501 r tillmplig p ytor som frbehandlats fr mlning med sdana metoder som blstring, manuell/maskinell bearbetning eller maskinslipning.

Denna del av IS0 8501 anger stlytans renhet med ledning av dess visuella utceende. I manga fall r detta tillrckligt fr ndamlet men fr belggningar, som troligen kommer att utsttas fr korrosiva frhllanden, ssom exponering i vatten och stndig kondensation, br man vervga prov fr att faststlla mngden Isliga salter och andra osynliga froreningar pa den tillsynes rena stlytan, detta med hjlp av de fysikaliska och kemiska metoder, som behandlas i olika delar av IS0 8502. Bestmning av ytrheten br ocks vervgas med hnvisning till IS0 8503.

2 Bindande referenser

Fljande standarder innehller bestmmelser som, genom hnvisning, aven utgr bestmmelser i IS0 8501. De utgvor som gllde vid utgivningen av denna standard anges. Alla standarder revideras fortlpande varfr man vid avtal baserat p denna standard br underska om cenaste utgvor av referensdokumenten kan anvndas. IECs och ISOs medlemmar tillhandahaller frteckningar ver gllande internationella standarder.

I S 0 2409:1992, Paints and varnishes - Cross-cut test

IS0 4624:1978, Paints and varnishes - Pull-off test for adhesion.

IS0 4627:1981, Paints and varnishes - Evaluation of the compatibility of a product with a surface to be painted - Methods of test.

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Svensk IS0 8501-2~1994 Annex A Annexe A ilpinnomeHine A

IS0 4628-1:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part I: General principles and rating schemes.

IS0 4628-2:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 2: Designation of degree of blistering.

IS0 4628-3:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 3: Designafion of degree of rusting.

IS0 4628-4:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 4: Designation of degree of cracking.

IS0 4628-5:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Parr 5: Designation of degree of flaking.

IS0 4628-6:1990, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of intensity, quantity and size of common types of defect - Part 6: Rating of degree of chalking by tape method.

I S 0 8501-1:1988, Preparation of steel substrates before application of paints and related products - Visual assessment of surface cleanliness - Part I : Rust grades and preparation grades of uncoated steel substrates after overall removal of previous coatings.

3 Tillstndet hos den malade yta som skall rengras

Graden av nedbrytning hos tidigare belagda ytor skall utvrderas enligt I S 0 4628, delarna 1 till 6.

Om mjligt ckall kompletterande information Imnac om den tidigare mlningcfrgen betrffande frgtyp, anta1 plagda skikt, tillverkarnamn, korrosiva froreningar, vidhftning och skikttjocklek.


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4 Frbehandlingsgrader

4.1 Allmnt

Ett anta1 frbehandlingsgrader, med angivande av frbehandlingsmetod och rengringens noggrannhet, specificeras. Frbehandlingsgraden definieras (se 4.2, 4.3 och 4.4) genom beskrivningar i ord av ytans utseende efter rengringen.

Varje frbehandlingsgrad betecknas med bokstverna 'Sa', 'St" eller "Ma' alltefter den typ av rengringsmetod som anvnts. Bokstaven P fre Sa, St eller Ma anger bara lokal borttagning av tidigare mlningsfrg. Eventuellt efterfljande siffror anger med vilken noggrannhet rengringen frn valshud, rost och tidigare mlningsfrg skett.

Det br noteras att de olika rengringsmetoderna inte ger jmfrbara resultat. Rengringsgraden skall vara frenlig med den typ av mlningssystem som skall anvndas vid ommlning.

I 4.2 och 4.3 hnvisas till fotografier i I S 0 8501-1, som ar representativa fotografiska exempel p frbehandlingsgrader.

ANMRKNINGAR

2 Begreppet 'andra froreningar', som anvnds i 4.2, 4.3 och 4.4, kan avse vattenlsliga salter och svetsrnedelsrester. Dessa froreningar kan inte fullstndigt avlgsnas frn stAlytan genom torrblstring, manuell/maskinell bearbetning eller rnaskinslipning; vtblstring kan anvndas.

3 Valshud, rost eller rnlningsfrg anses sina lst om den kan lyfas bort rned en sl spackelspade.

4 De fotografier som r bilagda denna del av IS0 8501 visar ngra typiska exernpel PA stai fre och efter lokal rengring.

4.2 Lokal blstring pa tidigare belagda ytor, P Sa

Frbehandling av stlytor lokalt genom blstring betecknas med bokstverna "P Sa".

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Fre blstring skall alia tjocka rostskikt hackas bort. Synlig frorening av olja, fett och smuts skall ocks avlgsnas.

Efter blstring skall ytan rengras frn lst damm och skrp.

ANM 5 fore och efter blstringsproceduren, beskrivs i IS0 8504-2.

Metoder fr frbehandling av stlytor genom blstring, inklusive behandling

P Sa 2 Noggrann lokal blstring

Frglager med god vidhftning skall vara intakta. Betraktad utan frstoring skall ytan av vriga delar vara fri frn synlig olja, fett och smuts, frn ls mlningsfrg och frn det mesta av valshud, rost och andra froreningar. Kvarvarande froreningar skall sitta ordentligt fast (se anm 3 under 4.1). Jmfr rned fotografierna CSa2 och D S a 2 i IS0 8501-1. Valet beror p graden av gropfrtning.

P Sa 2% Mycket noggrann lokal blstring

Frgbelggningar med god vidhftning skall vara intakta. Betraktad utan frstoring skali ytan av vriga deiar vara fri frn synlig oija, fett och smuts, frn ls mlningsfrg och frn valshud, rost och andra froreningar. Kvarvarande spar av froreningar far synas endast som svag missfrgning i form av prickar elier rnder. Jrnfr med fotografierna C Sa 2% och D Sa 2% i IS0 8501-1. Valet beror p graden av g ro pf rt ni ng.

Fotografier som visar exempei p frbehandiingsgraden P Sa 2% finns som bilaga till denna del av IS0 8501.

P Sa 3 Lokal blstring till ren metall

Frgbelggningar med god vidhftning skall vara intakta. Betraktad utan frstoring skall ytan av vriga delar vara fri frn synlig olja, fett och smuts, frn ls mlningsfrg och frn valshud, rost och andra froreningar. Den skall ha en enhetiig metailfrg. Jmfr med fotografierna C Sa 3 och D Sa 3 i IS0 8501-1. Valet beror p graden av gropfrtning.

ANM 6 Frbehandlingsgrad Sa 1 har inte tagits med eftersom motsvarande yta inte r Irnplig fr rnhlning.


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4.3 Lokal manuell/maskinell bearbetningl) av tidigare malade ytor, P St

Frbehandling av stlytor lokalt genom manuell/maskinell bearbetning ssom skrapning, borstning och slipning betecknas med bokstverna 'P St".

Fre manuell/maskinell bearbetning skall alla rostskikt hackas bort. Synlig frorening av oija, fett och smuts skall ocks avlgsnas.

Efter manuell/maskinell bearbetning skall ytan rengras frn lst damm och skrp.

ANM 7 inklusive behandling fre och efter rengringsproceduren, beskrivs i IS0 8504-3.

Metoder fr frbehandling av stlytor genom manuell/maskinell bearbetning,

P St 2 Noggrann lokal manuell/maskinell bearbetning

Frgbelggningar med god vidhftning skall vara intakta. Betraktad utan frstoring skall ytan av vriga delar vara fri frn synlig olja, fett och smuts och frn lst sittande valshud, rost, mlningsfrg och andra froreningar (se anm 3 under 4.1). Jmfr rned fotografierna C St 2 och D St 2 i IS0 8501-1. Valet beror p graden av gropfrtning.

P St 3 Mycket noggrann lokal manuell/maskinell bearbetning

Som fr P St 2, men ytan skall bearbetas mycket noggrannare s att den visar metallglans, som hrrr frn metallunderlaget. Jmfr med fotografierna C St 3 och D St 3 i IS0 8501-1. Valet beror pa graden av gropfrtning.

ANMRKNINGAR

8 Frbehandiingsgraderna P St 2 och P St 3 frutsatter inte att ngra speciella manuella/maskinella redskap anvnds, utan graderna bestms enbart av beskrivningarna tolkade med hjip av de representativa fotografiska exemplen.

9 Frbehandlingsgrad St 1 har inte tagits med eftersom motsvarande yta inte r Impiig fr malning.

1) Utom maskinslipning, se 4.4.

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= 1624669 0535623 671 IS0 8501 -2: 1994

Annex A Annexe A Ilpmoxetwe A

4.4 Lokal rnaskinslipning av tidigare malade ytor, P Ma

Frbehandling av stlytor lokalt genom maskinslipning betecknas med bokstverna "P Ma". Den omfattar rengring genom noggrann maskinslipning (t ex med slippappersrondell) eller med srskilda roterande stlborstar som kan anvndas tilisammans rned nlhammare.

Fre maskinslipning skail alla tjocka rostskikt hackas bort. Synliga froreningar av oija, fett och smuts skall ocks avlgsnas.

Efter maskinsiipning skali ytan rengras frn lst damm och skrp.

P Ma Lokal maskinslipning

Frgbelggningar med god vidhftning skall vara intakta. Betraktad utan frstoring skaii ytan av vriga deiar vara fri frn syniig oija, fett och smuts frn Isa frgskikt och andra froreningar (se anm 2 under 4.1) samt frn valshud och rost. Kvarvarande spar av froreningar far synas endast som svag missfrgning i form av prickar eller rnder. Fr jmfre

bs 7079 part a2 preparation grades of previously coated steel substrates after.pdf

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