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

US4274926A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Franz Simon · Schmitten, 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: C25D3/64
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

There are needed galvanic baths for the deposition of silver and silver alloys which exhibit a high resistance to sulfur and contain the least possible amounts of alloyed platinum group metals and/or gold. This is attained by using a salt melt as the electrolyte which melt contains a silver salt, alkali thiocyanate and salts of at least one alloying metal. Preferably the electrolyte contains per liter of salt melt 0.1 to 40 grams of silver and 1 to 200 grams of platinum metal and/or gold.