Composition and method for gold plating

摘要

A bath for electroplating hard gold deposits at relatively high current efficiencies comprises an aqueous solution of a phosphate electrolyte, 1-hydroxyethylidene-1,1-diphosphonic acid, metal constituent, alkali metal gold cyanide and a small amount of free alkali metal cyanide. The bath is maintained at a pH of 3.0-13.0 and operated at a current density of 0.1-165 amperes per square decimeter.