Electroplating gold-cobalt alloys

Details Electroplating gold-cobalt alloys Electroplating gold-cobalt alloys

C - Chemistry, Metallurgy

25

D

204/26

C25D 3/62 (2006.01)

Patent

CA 1103197

Abstract - CANADA A gold-cobalt alloy is electroplated on a substrate by passing an electric current between an anode and the substrate in a bath comprising an aqueous solution of: (a) gold potassium cyanide (b) nitrilotriacetic acid and (c) a cobalt salt in amount to provide 0.1 to 7.0 gpl of cobalt in the solution, the bath being at a pH of 3.5 to 6Ø The preferred bath comprises an aqueous solution containing: (a) 1.0 to 4.0 troy ounces per U.S. gallon (8.2 to 32.8 gpl) of gold, added as K Au (CN)2. (b) 3 to 100 gpl of nitrilotriacetic acid and (c) 0.1 to 7.0 gpl of cobalt added as cobalt sulphate, halide, nitrate or carbonate, the bath being at a pH of 3.5 to 6.0 and a temperature of 80 to 150 F (27 to 66°C) and the current passing at a density of between 1 and 100 ASF (0.1 to 11 ASD) at the cathode. The solution may also contain one or more of tripotassium citrate, dipotassium hydrogen phosphate and potassium dihydrogen phosphate as electrolytes.

288930

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