C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/26
C25D 3/58 (2006.01) C25D 3/62 (2006.01)
Patent
CA 1159006
ABSTRACT OF THE DISCLOSURE: The present invention is directed to a process comprising the galvanoplastic deposition of a gold-copper- cadmium alloy on a cathode in an aqueous bath containing 3 to 5 gr/l of gold in the form of alkali metal gold cyanide, 50 to 60 gr/l of copper in the form of alkali metal copper cyanide, 2 to 3 gr/l of cadmium in the form of alkali metal cadmium cyanide, a complexing agent, an organic wetting agent and an amount from 18 to 22 gr/l of an alkali metal sulfite sufficient current being provided to maintain a cathodic current density of from 2 to 3 amp/dm2 and an alloy deposition speed of greater than 0.65 micron thickness per minute, said bath being maintained at a temperature of from 70° to 75°C and at pH of from 9 to 11.
353977
Aliprandini Pino
Robic Robic & Associes/associates
LandOfFree
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