Method and electrolytic bath for the deposition of low carat bright gold-silver alloy coatings

US4487664A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Bernd Dorbath · Alzenau, DE
• Rainer Schlodder · Rodenbach, DE
• Norbert Giesecke · Bruchköbel, DE

Key dates

• Filing date: Mar 13, 1984
• Grant date: Dec 11, 1984
• Expiry date: Mar 13, 2004

Classification

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

Abstract

Bright, low carat gold-silver-alloy coatings which are ductile and have a thickness up to over 100 .mu.m are obtained from an electrolytic bath containing 0.5 to 25 g/l of gold in the form of alkali gold cyanide, 0.25 to 15 g/l of silver in the form of alkali silver cyanide and 10 to 200 g/l of alkali cyanide as well as 0.001 to 5 g/l of tellurium in the form of a water soluble tellurium compound.