Process for the galvanoplastic deposition of a gold alloy
OwnerPino Aliprandiniinventor
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Abstract
A method comprising the galvano-plastic deposition of a gold alloy on a cathode in an aqueous bath containing gold in the form of alkali metal and gold cyanide in the presence of alkali metal and copper cyanide, alkali metal and cadmium cyanide, a chelating agent and an organic wetting agent, wherein the conductivity of the bath is adjusted by the addition thereto of an amount of an alkali metal sulfite sufficient to maintain a specific cathodic current density alloy deposition speed.
Claims4
A method comprising the galvano-plastic 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 and gold cyanide, 50 to 60 gr/l of copper in the form of alkali metal and copper cyanide, 2 to 3 gr/l of cadmium in the form of alkali metal and cadmium cyanide, a chelating agent, an organic wetting agent and an amount from 18 to 22 gr/l of an alkali metal sulfite sufficient to maintain a cathodic current density of from 2 to 3 amp/dm.sup.2 and an alloy deposition speed of greater than 0.65 micron thickness per minute, said bath being maintained at a temperature of from 70.degree. to 75.degree. C. and at a pH of from 9 to 11.
Dependencies are inferred from the claim text.