agent for Au(I) ion to the buffered solution, wherein the complexing agent is an alkali metal cyanide; adding ammonium pyrroli- dine dithiocarbamate as a complexing agent for the AsO,-’ ion; extracting the ammonium pyrrolidine dithiocarbamate- AsO;’ ion; and analyzing the extracted ammonium pyrrolidine dithiocarbamate- AsO,-’ ion for As.

Aqueous Two-Component Polyurethane Coating U.S. Patent 5,723,5X3. Mar. 3, 1998 1. Kahl et al., assignors to Bayer AG, Leverkusen, Germany

A bimodal aqueous coating composition containing in dispersed form as binder an isocyanate-reactive component and a poly- isocyanate component.

Cathodic Electrocoating Composition USPatent 5,723,519. Mar. 3, 1998 A. Gam and D.Y. Chung, assignors to E.I. du Pant de Nemours and Co., Wilmington, Del.

An improved cathodic electrocoating composition comprising an aqueous carrier having dispersed therein a film-forming binder comprising an epoxy-amine adduct

and a blocked polyisocyanate crosslinking agent; wherein the improvement consists of an anticrater agent, which consists of a silane-terminated reaction product of poly- oxy alkylene diamine and garnma-gylci- doxy alkyl alkoxy silane.

Polyurethane Clearcoat U.S. Patent 5723,536. Mar. 3, 1998 5. Baumbach ef a/., assignors to Sayer AG, Levetkusen, Germany

An aqueous or water-dilutable blocked polyisocyanate for preparing polyurethane clearcoats having substantially reduced thermal yellowing.

Electrostatic Spray System U.S. Patent $725,761. Mar. 10, 1998 R.J. Had/e, assignor to No&cf~ Corp., Westike, Ohio

An electrostatic coating system including an improved spray gun for conductive paints.

Nonformaldehyde Immersion Coating U.S. Patent 5,725,640. Mar. 70, 1998 N.E. Joshi et al, assignors to Afotech USA Inc., N.J.

A composition of matter for treating a metallic surface prior to microetching and electrolytically applying a metal coating comprising a solution of an acid and a salt of hydrazine, an aliphatic amine, heterocy- clic amine, aromatic amine, diarylamine, diaminotoluene, methylenedianiline, phe- nylenediamine, or derivatives thereof, the molar ratios of acids to acid salts being from 0.5 to 0.8 to 1.

Polishing Pad U.S. Patent 5,725,420. Mar. 10, 1998 K. Jorii, assignor to NEC Corp., Tokyo

A polishing device having a pad, which has grooves and holes.

Car Body Surface Treatment Device U.S. Patent 5,725,669. Mar. 70, 1998 N. Heckmann, assignor to A&? N&t A5, Sfcckholm, Sweden

An apparatus for the surface treatment of one or more car bodies comprising a rotating device to which at least one car body mounted on a loading carriage is de- tachably connectable and which dips the car body into a treatment bath by rotation and in turn guides the body out of the bath

c-lz! AlETnmm for nickel, s&r, chrome, gold,

copper, paint, glass, and ceramics.

, . . . . er 1st m

Recommended for use on Wafers and in the Elecronic Circuit Board Industry.

controls, retards, and stabilizes sodiim carbonates in any cyanide plating bath.

www.pumachemical.com

Puma Chemical

hL Ab

P.O. Box 67, Warne, NC 28909 Voice: 800 211-7993

Fax: 828 389-4423 Global: 001-828-389-3074

Circle 098 on reader information card Circle 095 on reader information card

Advanced Automation & Waste Treatment Solutions

for Metal Finishing

features-i li,ooo pound capacity hoist

with air driven lank and up barrel

rotation system.

Small, specialized needs are met accurately with space saving Batch Waste Treatment Svstems. Phosohatino Svstem

4 Our state-of-the-art Tube Platmg Machine wdl continuously plate tubmg at speeds up to 5&l feet per minute.

Mid-Western Processes, Inc. 32043 Howard Street Madison Helghta;, MI 48071 248/M%-5500 Fax 248/585-8538

88 METAL FINISHING l AUGUST 1998