paint residue comprising contacting with a solvent mixture consisting essentially of 15 to 35% by weight of one or more glycol ethers and 65 to 85% of o~e or more ali- phatic ketones.

Process for Imparting a Blue Color to Zinc/Aluminum Alloy U.S. Patent 5,700,334. Dec. 23, 1977 H, Ishii and Z Ogino, assignors to Henket Corp,, Plymouth Meeting, Pa.

A process for imparting a bright blue color to a zinc/aluminum alloy surface that

contains 0.1 to 60% aluminum by treat- ment of the surface with an aqueous liquid treatment composition that has a pH of 3.5 to 6, tha~ does no1 comain chromium, arid that contains a molybdenum compound content of 0.2 to 3.0% by weight calculated as molybdenum an a fluoride content of 0.1 to 2.0% by weight calculated as fluorine.

M e t h o d of Treat ing C o p p e r Foil u.s. Patent 5,700,362. Dec. 23, 1977 M. Yano and M. Takami, assignors to Fukuda Metal Foil and Powder Co. Ltd., Kyoto, Japan

Electrodeposition: The Materials Science of Coatings and Substrates

by J, W. Dini 367 pages $78.00

The first comprehens ive b o o k on materials science and its relat ionship to e tectrodeposi t ion and o ther coating technologies. The au thor demonstra tes how the principles of materials science can be used to explain the structure of electrodeposi ts and shows h o w these structures inf luence deposi t properties. Topics covered inc lude hydrogen embrit- t lement, adhes ion, diffusion, porosity, stress additives, corrosion, a nd wear.

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The Self-Cleaning phoenix Electrode Company introduces the next generation of self-cleaning pH electrodes:

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A method for surface treating copper foil having a shiny side for printed circuits comprising a step of forming a first layer of a zir~c a}loy of zinc and r~icke} and cobalt by electroplating the shiny side surface of the copper foil, an a step of forming a second layer by immersing the first layer in an aqueous solution bath containing benzo- triazole derivative and a phosphorus com- pounds,

Cleaning an Coating Process U.S. Patent 5,700,366. Dec. 23, 1977 VL. Steblianko and VM. Riabkov, assignors to Metal Technology Inc., Mandeville, La.

An electrolytic process for simultaneously cleaning and metal coating the surface of a workpiece of an electrically conducting ma- terial, which comprises providing an electro- lyric cell with a cathode comprising the sur- face of the workpiece and an anode comprising the metal for metal coating of the surface of the workpiece.

Etching Solution for Copper or Copper Alloy U.S. Patent 5,700,389. Dec. 23, 1977 T. Nakagawa, assignor to MEC Co. Ltd., Amagasaki, Japan

An etching soiutlon for copper or copper alloys comprising sulfuric acid; a persul- fate; at lease one compound selected from the group consisting of imidazole, imida- zole derivatives, or pyridine derivatives; water; and amidosulfuric acid or an ali- phatic sulfonic acid.

Rotary Valve for Regenerative Thermal Oxidizer U.S. Patent 5,700,433. Dec. 23, 1977 G. Somary, assignor to Eisenmann Corp., Crystal Lake, lit.

A system for use in a regenerative ther- mal oxidizer comprising a rotatable valve body between and relative to an upper sur- face and a fixed lower surface of the regen- erative thermal oxidizer so as to direct gas flow in a substantially leak-free manner between the lower surface, the valve body, and the upper surface.

Optimizing Gray Primer in Multilayer Coatings U.S. Patent 5,700,515. Dec. 23, 1977 A.B.J. Rodr~gues, assignor to E.L du Pont de Nemours and Ca., Wilmington, DeL

A method for applying multiple layers of coating compositions on a previously painted snbstrate by first applying a layer of a coating of a primer composition and then applying over the primer coating a topcoating that matches the color of the painted substrate at less than complete hid- ing to achieve a color match of the topcoat-

178 METAL FINISHING • JUNE 1998