01 01 03 alkaline degreasing

©AIRBUS INDUSTRIEPROCESS AND MATERIAL SPECIFICATION

PROCESS SPECIFICATION

01-01-03

ALKALINE DEGREASING

Printed in Germany

®AIRBUS INDUSTRIEPROCESS AND MATERIAL SPECIFICATION

RECORD OF REVISIONS

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©AIRBUS IHDUSTRIEPROCESS AND MATERIAL SPECIFICATION

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®AIRBUS INDUSTRIEPROCESS AND MATERIAL SPECIFICATION

TABLE OF CONTENTS

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TOC 01-01-03Page 1Aug 01/93

SUBJECT PAGE

1 . GENERAL 1

1 .1 Scope 11 .2 Limitations 1

2 . EQUIPMENT, MATERIALS , PERSONNEL 1

2 .1 Equipment and plant 12 .2 Materials 22 .3 Health and safety statement 2

3 . PROCESS 2

3 .1 Immersion cleaning 23 .2 Spray cleaning 4

4 . QUALITY REQUIREMENTS 5

4 .1 General 54 .2 Quality requirements 5

5 . REFERENCED DOCUMENTS 6

1 . GENERAL

This Document shall not be used as a basis for manufacture and supply oforiginal and replacement parts to AIRBUS INDUSTRIE unless specificallyrequired in a contract or purchase agreement .

1 .1 Scope

This specification describes methods for cleaning andalkaline solutions for metal parts .

The process shall be carried out prior to subsequentin order to ensure that the components are free fromwhen they are placed in the pickling baths .

Cleaning methods are :

a) Immersion cleaning

b) Spray cleaning

1 .2 Limitations

The


NOTE : Spray cleaning is only applicable for thefluids from aluminum alloy parts prior tosuch as machining, deburring etc .

following parts shall not be treated according to this specification .

a) Assemblies or welded structures with faying surfacesentrapment of solution may occur .

b) Parts with anodic or chromate conversion coatings because the levelof corrosion protection will be reduced by this treatment .

NOTE : Titanium parts and its alloys may not be degreased withchlorinated solvents .

2 . EQUIPMENT. MATERIALS, PERSONNEL

2 .1

Equipment and plant

a) Rinsing and cleaning equipment shall be capable ofrequirements of this specification .

b)

c)

Printed in Germany

degreasing with

pickling processesgrease and dust

removal of cuttingmanufacturing operations

in which

satisfying the

The immersion cleaning tanks made of plastic, stainless steel orsteel with plastic lining shall be provided with :- a heating system to maintain the solutions at the specified

temperature,- facilities for agitating the solutions if necessary to minimize

temperature and concentration variations,- adequate fume extraction .

Compressed air used for solution agitation or drying shall be freefrom moisture, oil and solid particles .

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2 .2 Materials

Alkaline cleaner Turco 4215-NC

Alkaline cleaner P3-Almeco 18

Alkaline cleaner Turco 4215-NC-LT

Alkaline cleaner Turco 4215 additive when necessary (presence of inks)(1 - 2%)

Deionized water

Nylon brush

2 .3

Health and safety statement

This specification does not necessarily detail the precautions necessaryto meet the requirements of health and safety . It is the responsibilityof the user of this specification to consult and establish appropriatehealth and safety precautions and the method should be operated only bytrained personnel .

3 . PROCESS

3 .1

Immersion cleaning

3 .1 .1 General remarks

©AIRBUS IHDUSTRIEPROCESS AND MATERIAL SPECIFICATION

a) Parts shall be racked or wired in such a manner that :- solutions and rinse water will contact all surfaces to be treated,- carry over of solutions is limited to a minimum and- damage to parts is prevented .

Tubes which cannot be racked so that they will drain, must be givenspecial handling treatments to remove solutions which would otherwisebe entrapped and to prevent air pockets . Flush and/or repositiontubes as necessary to completely remove all pickling solution andrinse water .

b) When possible, cleaning solutions, rinse water, or parts shall beagitated during processing . All cleaning solutions shall be agitatedafter prolonged standing or after addition of chemicals or water toensure uniformity of concentration . Air or mechanical agitation canbe used . For air agitation the bath shall be at the requiredtemperature to avoid the formation of excessive foam .

c) After cleaning and rinsing the parts shall be free from grease, oil,smut and other contamination . This means the surfaces shall bewater-break free . A water-break free surface is one which, whenwetted with clean water (max . 35 ° C), either by immersion or spraywill maintain a continuous film of water, for a minimum of 30seconds .

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3 .1 .2 Selection of cleaning solution


d) The temperatures of the cleaning solutions shall be within theallowable ranges during processing . Ensure that the temperature ofany solution shall never rise above 80°C as emulsifiers might becomeinsoluble .

e) Mixing acid and alkaline solutions in the same water rinse mightresult in a precipitation of insoluble material on the surface ofthe part . Therefore alkaline cleaned parts shall not be rinsed inimmersion rinse tanks that follow acid processing .

The appropriate cleaning solution shall be selected from Table 1 .

3 .1 .3 Cleaning solutions (General)

Table 1

a) The cleaning solutions shall be kept free of visible debrisOperations shall be suspended and corrections made when :

surfaces do not remain water-break free after cleaning,a non removable smut is formed or particles are deposited on thesurface of the parts,the solution temperature or composition is outside the controlLimits,the solution is not at the required operating level,the solution is no longer effective,parts are pitted andthe sludge which forms at the bottom of the tank interferes withthe proper operation of the solution .

b) Oil, grease, etc ., accumulating on the surface of the solutions,shall be removed by skimming, overflowing or other suitable means asoften as is necessary .

c) The following procedure shall be used for making-up alkaline cleanersolutions :

Fill the clean tank to aproximately 2/3 full with deionized or tapwater .Heat within the required temperature limits .Distribute the required quantity of cleaner uniformly over thewater surface in small quantities and agitate thoroughly .When the cleaner is completely dissolved fill the tank withdeionized or tap water to the operating level and agitate .

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CLEANER Concentr . Temp . Immersion Metals and their alloys totime be cleaned

solution g/L ° C (minutes) AL Mg Other metals

Turco 4215-NC 30 - 50 60 - 90 5 - 20 X X X

P3-ALmeco 18 30 - 50 60 - 80 20 - 22 X X X

3 .1 .5 Cleaning procedure


d) The level of the cleaning solutions shall be maintained within 5 cmof the operating level .

3 .1 .4 Pre-cleaning

The parts shall be relatively free of visible contamination and temporarylacquer coatings to minimize the contamination in the cleaning tanks . Ifthis is not the case, the parts shall be pre-cleaned by vapourdegreasing in accordance with PMS 01-01-01 (for titanium parts thelimitations in 1 .2 shall be observed) or by solvent cleaning inaccordance with PMS 01-01-16 .

Remark : After vapour degreasing and prior to commencing alkalinecleaning, parts shall be throughly dried to preventcontamination of alkaline cleaner solutions with solvent .

The parts shall be treated as follows :

a) Immerse the parts in the applicable cleaner solution in accordancewith Table 1 . Consult 3 .1 .1 b) for the use of agitation . Lightlyscrub the wet surface with a nylon brush, if necessary, to assistremoval of stubborn contamination .

b) Remove the parts from the cleaning solution and rinse immediately incold running water for a minimum of 5 minutes without allowing theparts to dry . Wherever possible, rinsing after cleaning in asolution operated above 70°C should include the use of a waterfogcurtain above the alkaline tank to avoid the solution drying on thepart .

c) Inspect parts for water-break according to 3 .1 .1 c) during draining .

d) Repeat steps a) through c) until water-break free surface isobtained .

e) Rinse in hot (e .g . 60 - 80°C) deionized water (see PMS 01-01-18) ifdesired to facilitate drying .

f) Allow parts to air dry, 90° C maximum, except where a wet processfollows immediately .

g) Protect the dried parts from contamination and abrasion . Wrap ifnecessary .

3 .2

Spray cleaning

3 .2 .1 General remarks

a) Parts shall be racked or positioned in such a manner that solutionsand rinse water will contact all surfaces to be treated .

b) After final rinsing the parts shall be visibly clean, a water-breakfree surface i s prefered but not

required .

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c)

3 .2 .2 Cleaning solution (General)

Operations shall be suspended and corrections made when :

a)b)

c)

The temperature of the cleaning solution shall be within theallowable ranges during processing . The temperature of the solutionshall never rise above 80°C as emulsifiers might become insoluble .

surfaces do not become visibly clean after cleaningthe solution temperature or composition is outside the control limitsorthe solution is no longer effective

3 .2 .3 Cleaning procedure

The

a)

b)

parts shall be treated as follows :

Spray clean with Turco 4215-NC-LT (see Table 2) as long as necessaryto obtain a visibly clean surface (1 - 5 minutes) .

Spray rinse immediately after cleaning with cold water and check forcontamination .

c) Repeat steps 3 .2 .3 a) and 3 .2 .3 b) if parts are not visibly clean .

4 . QUALITY REQUIREMENTS

4 .1 General

4 .2

Quality requirements

®AIRBUS IHDUSTRIEPROCESS AND MATERIAL SPECIFICATION

Table 2

Processing shall conform the requirements of this specification . Ifsuspected during processing that the materials, equipment, plant orprocess do not comply with the requirements of this specification, theprocess shall be discontinued until to the satisfaction of the QualityAssurance Department the requirements are met again .

a) Cleaning solution and hot water rinses shall be checked to determineconformance with the requieements of 3 .1 .3 and 3 .2 .2 .

b) Immension cleaned surfaces shall meet the requirements of 3 .1 .1 c) .Spray cleaned surfaces shall meet the reqiurements of 3 .2 .1 b) .

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CLEANER Concentr . Temp . Spray time Metals and their alloysto be cleaned

solution g/l °C (minutes) AL Mg Other metals

Turco 4215-NC-LT 7 - 13 40 - 50 1 - 5 X NO X

5 . REFERENCED DOCUMENTS

®AIRBUS IHDUSTRIEPROCESS AND MATERIAL SPECIFICATION

PMS 01-01-01

Degreasing using chlorinated solvent in vapour phase

PMS 01-01-16

Cold agent cleaning (solvents)

PMS 01-01-18

Water for chemical treatments

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01 01 03 alkaline degreasing

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