Circle 010 on reader information card

agent has a higher specific gravity than that of the solvating agent.

Vapor Degreasing Method US. Patenf 5,716,458. Feb. 10, 1998 K. Machino, assignor to Nikon Corp., Tokyo

A method for washing and drying an article comprising providing an azeotropic liquid in a tank, said azeotropic liquid con- taining water and an alcohol having one to six carbon atoms: providing an article in the tank disposed above a surface level of the azeotropic liquid; heating the azeotro- pit liquid for producing a vapor to wash the article; maintaining the vapor to have a temperature of not more than 100°C during the heating step; and drying the article.

Sputtering Apparatus U.S. Patent 5,716,505. Feb. 10, 1996 M. Scherer, assignor to Balzers Prozess-Systems GmbH, Hanau, Germany

An apparatus for coating substrates by cathode sputtering with a hollow target.

Device for Electrolytic Surface Coating U.S. Patent 5,716,509. Feb. 10. 1996 R. Kamm, assignor to Ecograph AG, Weesen, Switzerland

A process for electrolytic surface coat- ing of an electrically conductive workpiece by means of a fluid electrolyte conveying the electrolyte in a controlled circuit into an

electrolysis tank and into and around an electrolysis region in the electrolysis tank, the electrolysis region being defined by an anode and a cathodically connected work- piece, the electrolysis tank having an over- flow region through which electrolyte can flow from the electrolysis region and into an overflow tank, the anode having a first side closest to the workpiece and a second side farthest from the workpiece, a greater portion of the electrolyte being conveyed in a first stream from a first inlet at a higher flow rate into a space between the cathodi- caliy connected workpiece and the anode, the first stream flowing adjacent to and generally parallel to the first side of the anode and flowing toward and into the overflow region, a lesser proportion of the electrolyte being conveyed in a second stream from a second inlet at a lower flow rate, the second stream flowing adjacent to and generally parallel to the second side of the anode and tlowing toward and into the overflow region; removing the electrolyte into the overflow tank once the electrolyte has passed through the electrolysis region and the overflow region; separating anode sludge from the electrolyte in the overtlow tank; and feeding the electrolyte back from the overflow tank into and around the elec- trolysis region.

Anodizing Electrolyte U.S. Patent 5,716,511. Feb. IO, 1998 B.J. Melody et a/., assignors to Kemet Electronics Corp., Greenville, S. C.

A process for anodizing a valve metal comprising conducting the anodization at a temperature below 50°C in an aqueous electrolyte containing a polyethylene gly- co1 dimethyl ether having from 4 to IO repeating ethylene oxide units and phos- phoric acid or an electrolyte-soluble salt thereof, said electrolyte having a resistivity below about 5,000 ohm cm at 30°C.

Paint Spraying with Compressed Fluids U.S. Patent 5,716,558. Feb. IO, 1998 K.A. Nielsen ef a/., assignors to Union Carbide Chemicals & Plastics Technology Corp., Danbow Corm.

A method for producing coating pow- ders, catalysts, and drier waterborne coat- ings by spraying compositions with com- pressed fluids.

Protective Coatings for Polyimide Composites U.S. Patenf 5,716,677. Feb. 10, 1996 A.M. lwazany and SG. Prybya, assignors to Ohio Aerospace Institute, Brook Park, Ohio

A method of protecting a polyimide ma- trix article against oxidation comprising synthesizing a coating solution by reacting an aromatic dianhydride with an aromatic

78 METAL FINISHING l AUGUST 1998

diamine including a mixture of paraphe- prised of bright nickel; a third layer com- nylenediamine and metaphenylenediamine prised of palladium alloy; a fourth layer in a ratio of metaphenylenediamine to par- comprised of zirconium or titanium; and a aphenylenediamine of 90: 10 to 1523.5; and, fifth layer comprised of a zirconium com- coating the article with the solution. pound or a titanium compound.

Two-Coat Finish U.S. Went 5,716,678. Feb. i0, 1998 U. R&krath et al., assignors to BASF Lacke Farben, AG, Muenster-H&up, Germany

A process for the production of a two-coat finish on a substrate surface comprising ap- plying a pigmented basecoat to the substrate surface; drying the basecoat film; applying to the basecoat film a nonaqueous, transparent topcoat comprising a hydroxyl group-con- taining polyacrylate resin and a crosslinking agent, and baking and curing the basecoat and the topcoat together.

Multilayer Coated Article U,S. Patent 5,716,721. Feb. 10, 1998 S.R. Moysan, 111 and R. W Sugg, assignors to Baldwin Hardwere Corp., Reading, Pa.

An article comprising a metallic sub- strate having on at least a portion of its surface a first layer comprised of semibright nickel; a second layer com-

Method to Eliminate the Use of a Solder Mask U.S. Patent 5,716,760. Feb. II?, 1998 E Juskey et al., assignors to Motorola Inc., Schaumburg, 111.

A method for plating a substrate to elim- inate the need for a solder mask during subsequent component solder attachment processes comprising coating with a poly- mer catalyst; coating with a first plating mask photopolymer; photo-optically imag- ing a circuit pattern; developing the thus exposed first plating mask photopolymer thereby forming windows; at least partially filling the windows with copper; covering the copper with nickel, said nickel oxidiz- ing rapidly when exposed to air. thereby rendering the exposed surface unsolder- able; removing the first plating mask pho- topolymer without removing the copper or nickel or said polymer catalyst; coating the

polymer catalyst and nickel with a second plating mask photopolymer; photo-opti- cally imaging an inteconnect pattern; de- veloping the thus exposed second plating mask photopolymer; plating over the inter- connect pattern with gold; removing the second plating mask photopolymer without removing the copper, nickel, or gold, wherein the nickel selectively prevents ad- hesion of solder applied to the substrate to provide electrical interconnection between the circuit pattern and an external compo- nent.

Recovery of Secondary Polyols from Paint Sludges U.S. Patent 5,776,9%X Feb. 70, 1998 B-U. Kefiemann and M. h4elchione, assignors to Mercedes-Benz AG, Stuttgart, Germany

A method for recovering secondary polyols from paint sludge coagulate formed from paint overspray collected during spray painting to which a coagulant has been added and which has been dewatered, said method comprising heating the paint coagulate to a temperature above IOO”C, and glycolytically splitting organic compo- nents of the paint coagulate into polyols,

There may be other power supply manufacturers, but only one with 30 years experience in producing state-of-the-art plating and process systems. You can rely on HBS for all of your power supply requirements.

b LABORATORY b PORTABLE POWER SilPPLlES .

b MFTFRS ANn TIMFRS ) VARIABLE

TRANSFORMERS b PERIODIC REVERSE UNITS

) PRECIOUS METAL PLATING k POWER SUPPLY PARTS

) SWITCH MODE ) CHEMICAL FEEDERS

) SOLID STATE ) AMP/HOUR METERS

b ANODIZING

For more information. contact us todav

E&pm&t Corporation

14700 Alondra Boulevard l La Mirada l CA l 90638 Fax 714521.4488 l Phone 7l4.522.4100

Circle 103 on reader information card

METAL FINISHING l AUGUST 1998 79