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Process for Dezincing Galvanized Steel us. Patent 5,779,878. July 14, 1998 WA. Morgan et al., assignors to Metal Recovery Industries (US) Inc., East Chicago, Ind. A process of removing zinc from galva• nized steel comprising immersing in an aqueous electrolyte containing sodium or potassium hydroxide. galvanically corrod• ing the zinc from the surface of the galva• nized steel in a reaction in which there is an anode and a cathode. wherein the zinc serves as the anode and the material serv• ing as the cathode is principally a material having a standard electrode potential inler• mediate of the standard electrode potentials of zinc and cadmium in the electrochemical series, and treating the galvanized steel to accelerate the corrosion rate of the zinc from the galvanized steel, said treatment comprising increasing the number density of corrosion sites in the galvanized steel by mechanically abrading or deforming the galvanized steel: heating the galvanized steel to form an alloy of zinc on the surface of the galvanized steel; mixing the galva• nized steel with a material having a stan- dard electrode potential intermediate of the standard electrode potentials of zinc and cadmium in the electrochemical series with the proportion of said material being at least 5% by weight of the mixture; or caus• ing the galvanized steel to move relative to itself and to the electrolyte while immersed in the electrolyte. Method for Selective Plating us. Patent 5,779,921. July 14, 1998 HE. Haslow el al., assignors 10 WL. Gore & Associates Inc., Newark, Del. A method for making a substrate having differential front-to-back terminal metal thickness comprising providing an organic• based substrate having a conductive metal layer on a front and back side Ihereof: protecting the back side of the substrate. metallizing the front side wherein the met• allizing is conducted by electroplating while electrically bussing the front side with the back side; and unprolecling the back side and protecting the front side and metallizing the back side by at least one of electroless plating or immersion plating. Multilayer Coating us. Patent 5.780,113. July 14, 1998 Y. Masuda et al., assignors to Kansai Paint Co. Ltd., Japan A method for fomling a multilayer coating film by applying a clear coating on a film of a leafing aluminum flake-containing metallic coating. which method comprises forming a film of the metallic coating. curing the film, applying thereon a composition containing a polymer formed from an unsaturated mono• mer having a phosphoric acid group and a hydroxyl group-containing unsaturated monomer. and then applying the clear coating on a film of the composition. Pretreatment Method us. Patent 5,780,122. July 14, 1998 S. Shirahata et al., assignors to Nippon Paint Co. Ltd., Osaka, Japan A pretreatment method for coating on a molded metal article having a substantially horizontal surface comprising carrying and dipping the molded metal anicle in a solu• tion stored in a treatment bath; and agitat• ing the solution around the horizontal sur- Elcomeler 355 - - ... Model capacities: 7, 75, 150 and 250 Ibs. New Holland dryers are the right choice to dry your parts spot-free in 60 'seconds. Heavy-duty construction gives you years of dependable service. Phone (717) 355-1458 or Fax (717) 355-3440 New Holland North America, Inc. P.O. Box 262 New Holland, PA 17557 www.newholland.cominalProductslDryers.html Dry 250 Ibs. of small parts in seconds The handheld tester with +/- 10/0 accuracy you can take anywhere. The Elcometer 355 packs a lot in one small package.This shop hardened coating thickness gage will store batch calibrations allowing you to go from part to part without additional set-up time. Absolute Accuracy You Can Put Your Hands On ••• •• •• •• •• •• a. """""-' 800-521-0635 e ® Rochester Hills, MI48309 e-..., e-mail: illc@elcometel:col/I • 1V1V1V.elcollletel:colII And the 355 modular probe concept allows for a wide array of optional probes for electroplating : and other coatings. Plus the 355 stores data and easily outputs reports, statistics and histograms to printer or Pc. ••• details or aFREE brochure, call: Circle 020 on reader information card Circle 040 on reader information card METAL FINISHING • DECEMBER 1998 73
