Process and bath for the electrolytic deposition of gold-tin alloy coatings

US4634505A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

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

Key dates

• Filing date: Feb 26, 1986
• Grant date: Jan 6, 1987
• Expiry date: Feb 26, 2006

Classification

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

Abstract

To produce electrolytic deposition of glossy gold/tin alloys there are employed baths having a pH below 3 which contain 1 to 20 g/l gold in the form of tetracyanoaurate (III), 0.1 to 10 g/l tin, an acid and a conducting salt, whereby the tin is in the form of a tin (IV)-oxalato complex.