Process for the electrolytic deposition of gold and gold alloy coatings and compositions therefore

US4274927A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Franz Simon · Schmitten, DE
• Wolfgang Zilske · Hanau, DE
• Manfred Schmidt · Krefeld, DE

Key dates

• Filing date: Mar 31, 1980
• Grant date: Jun 23, 1981
• Expiry date: Mar 31, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D3/66
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

For the electrolytic deposition of gold alloys there is required a process with which low carat coatings can be deposited which nevertheless have a high resistance to tarnish. Such coatings are obtained from electrolytes which consist of a salt melt and contain gold salts, alkali thiocyanate and salts of one or more alloyings elements as constituents. Preferably the electrolyte contains per liter of salt melt 0.5 to 20 grams of gold, up to 300 grams of Cu, Zn, Sn, Cd, Ni, Ag, Pd, Ru and/or Pt, up to 200 grams of alkali cyanide and/or water.