Cyanide-free electroplating bath for the deposition of gold and gold alloys

US6165342A · kind A · utility

Assignee

• Degussa-Huels AG · DE

Inventors

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

Key dates

• Filing date: Jun 2, 1998
• Grant date: Dec 26, 2000
• Expiry date: Jun 2, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D3/48
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Cyanide-free electroplating baths for deposition of gold and gold alloy coatings, using sulphurous gold complexes that are stable for a relatively long time, can be used with current density over 1 A/dm.sup.2 and are practically odor-free, are obtained when the sulphurous compounds used are mercaptosulfonic acids, dye sulfide sulfonic acids or salts thereof.