Bath and process for the electrolytic deposition of gold-indium alloys

US4617096A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Werner Kuhn · Rodenbach, DE
• Wolfgang Zilske · Hanau, DE

Key dates

• Filing date: Jan 28, 1986
• Grant date: Oct 14, 1986
• Expiry date: Jan 28, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D3/62
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Light yellow, glossy and ductile gold-indium alloys which have a good resistance to gradual corrosion by silver sulfide are obtained from electrolytic (galvanic) baths containing 1 to 20 g/l of gold in the form of alkali or ammonium tetracyanoaurate (III), 0.5-50 g/l of indium in the form of a water soluble indium salt, a buffer or conducting salt and 0.5 to 10 mg/l of selenium and/or tellurium.