Deposition of copper-tin and copper-tin-zinc alloy from electrolyte

摘要

The present invention relates to a cyanide-free electrolyte comprising phosphoric acid and an aliphatic or aromatic thio compound and to a process for the electrolytic deposition of elemental copper, tin and optionally zinc containing alloys is there. In these electrolytes and processes, the electrolyte used contains stannate ions, copper ions and optionally zinc (II) ions, as well as aliphatic and / or aromatic thio compounds. The electrolyte may additionally contain a carboxylic acid, a humectant and / or a brightening agent. The present invention further provides a process for electrolytically depositing alloys of copper, tin, and optionally zinc on consumer goods and accessories using the electrolyte of the present invention.