Electroless Deposition of Gold from Aqueous Solution on Base Metals of Nickel and Iron-Nickel-Cobalt Alloys

A new solution formulation for the chemical (electroless) deposition of gold is proposed. The main constituents of this solution are potassium gold cyanide, citric acid or tartaric acid, tungstic acid, and N,N‐diethylglycine sodium salt. Optimum concentrations of these constituents were determined by a statistical evaluation of the solution at four concentration levels. Investigation of such variables as immersion time, solution temperature, and pH, which affect the chemical deposition of gold from solution, enabled determination of optimum operating conditions.