Electrodeposition of Cu-Cd alloys

Cu-Cd alloys have been electrodeposited from a bath containing copper sulphate, cadmium sulphate, ammonium sulphate and ammonium hydroxide. Increase in current density or duration of electrolysis increases the cadmium content in the deposit. The brightness of the deposit and the cadmium content, however, fall with decrease in the concentration of ammonium sulphate or ammonium hydroxide in the electrolyte. Increase in current density usually increases the cathode efficiency, except in very concentrated baths, where the cathode efficiency first increases with current density, but later decreases. (author)