Method of obtaining a yellow gold alloy deposition by galvanoplasty without using toxic materials

摘要

The invention concerns the field of galvanic depositions and relates to a method of galvanoplastic deposition of a gold alloy on an electrode dipped into a bath including metal gold in alkaline aurocyanide form, organometallic compounds, a wetting agent, a sequestering agent and free cyanide. According to the invention, the alloy metals are copper, in double copper and potassium cyanide form, and silver in cyanide form, allowing a mirror bright yellow gold alloy to be deposited on the electrode.

主权项

1. An electrolytic deposition comprising:
a galvanoplastically deposited gold alloy layer, said alloy being a bright 3N colour gold alloy composition of 75% gold, 21% copper, and 4% silver, and being free of cadmium and zinc, said layer being between about 1 μm and about 800 μm thick, wherein a structure of said alloy composition is formed by dipping an electrode into a bath comprising a proportion of 9.08% gold metal in alkaline aurocyanide form, 90.85% copper metal in alkaline double cyanide form, 0.07% silver metal, organometallic compounds, a wetting agent, a sequestering agent, and free cyanide.