Pyrophosphate-based bath for plating of tin alloy layers

US8647491B2 · kind B2 · utility

Assignee

• Atotech Deutschland GmbH & Co. KG · DE

Inventors

• Philip Hartmann · Berlin, DE
• Lars Kohlmann · Berlin, DE
• Heiko Brunner · Berlin, DE
• Klaus Schulz · Berlin, DE

Key dates

• Filing date: Feb 5, 2009
• Grant date: Feb 11, 2014
• Expiry date: Feb 10, 2030

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D3/60
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

An aqueous cyanide-free electrolyte bath for plating of tin alloy layers on substrate surfaces comprising (i) a tin ion source and a source for another alloy element, characterized in that it further contains (ii) N-methyl pyrrolidone is described.