Electroplating bath for the electrodeposition of silver-tin alloys

US5514261A · kind A · utility

Assignee

• W. C. Heraeus GmbH · DE

Inventors

• Gunter Herklotz · Bruchköbel, DE
• Thomas Frey · Brighton, US
• Wolfgang Hempel · Dresden, DE

Key dates

• Filing date: Jan 30, 1995
• Grant date: May 7, 1996
• Expiry date: Jan 30, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D3/64
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Silver-tin alloys can be deposited by the galvanic method from a cyanide-free bath which is prepared using silver as the nitrate or diammine complex, tin as the soluble tin(II) or tin(IV) compound and mercaptoalkane-carboxylic acids and -sulfonic acids, Uniform and adhering coatings of silver-tin alloys with a silver content of approximately 20 to 99 weight % can be deposited from said bath. Silver-tin alloys are electrodeposited from said bath at a pH of 0 to 14 and a current density of 0.1 to 10 A/dm.sup.2.