Abstract: A cyanide-free bath for producing bright, adherent electrodeposits of palladium uses 3-butyne-2-ol as the brightener.

Abstract: A novel bath is provided for producing bright and relatively stress free electrodeposits of palladium/nickel alloy upon a workpiece. The bath includes, in addition to palladium and nickel ions as ammino complexes, amounts of saccharin and 3-butyne-2-ol that are, respectively, effective to reduce internal stresses and to brighten the deposit.

Abstract: A bath for electroplating hard gold deposits at relatively high current efficiencies comprises an aqueous solution of a phosphate electrolyte, 1-hydroxyethylidene-1,1-diphosphonic acid, metal constituent, alkali metal gold cyanide and a small amount of free alkali metal cyanide. The bath is maintained at a pH of 3.0-13.0 and operated at a current density of 0.1-165 amperes per square decimeter.

Abstract: A bath for electroplating hard gold deposits at relatively high current efficiencies comprises an aqueous solution of an alkali metal dihydrogen phosphate, nitrilotris(methylene) triphosphonic acid, a nickel and/or cobalt phosphate compound, triethanolamine borate, alkali metal gold cyanide and a small amount of free alkali metal cyanide. The bath is maintained at a pH of 3.8-4.5 and operated at a current density of 0.1-20 amperes per square decimeter.

Abstract: An aqueous bath for electroplating a gold/silver alloy includes a water soluble electrolyte such as potassium pyrophosphate, gold and silver present as their respective alkali metal cyanides, and a water soluble brightener system. The water soluble brightener system comprises a selenium compound containing selenium in the -2 valance state and a polyethyleneimine compound. The bath has a pH of about 8 to 10 and may include tetraethanolamine borate ester to decrease the tensile stress of the electrodeposit.

Abstract: An electroplating test cell comprises a tank having a housing supported within it, the housing being divided into an annular anode compartment and an inner cathode compartment. A cylindrical cathode support is mounted for rotation within the cathode compartment and is vertically adjustable therein to vary its position relative to electrolyte flowed within the compartment. The housing is supported near the bottom of the tank so that different levels of electrolyte may be maintained above the housing to provide varying liquid conditions ranging from a static pressure head to spray chamber plating. Rotation speed of the cathode support is variable to simulate different speeds of material movement through a plating bath.

Abstract: A dry powder composition for stripping gold and silver contains 78.0-95.0 percent of a soluble cyanide compound, 0.01-5.0 percent of a soluble lithium compound, 0.01-0.5 percent of a soluble lead or bismuth compound as an auxiliary agent, and 5.0-22.0 percent of a water soluble ring-substituted nitrobenzene acid compound. The nitrobenzene acid compounds are selected from the group consisting of the alkali metal and ammonium salts of methyl-nitrobenzoic acid, chloro-nitrobenzoic acid and amino nitrobenzoic acid and of chloro-nitrobenzenesulfonamides. In using the composition, 7.5-60.0 grams per liter of the dry powder composition is dissolved inwater and the resultant aqueous solution is maintained at a temperature of 18.degree.-55.degree. Centigrade. The solution may be replenished as the stripping rate decreases by addition of further amounts of the dry powder composition.