Process for phosphating electrolytically zinc-coated metals

US4762572A · kind A · utility

Assignee

• Gerhard Collardin GmbH · DE

Inventors

• Raschad Mady · Frechen, DE
• Caecillie Daniel · Monheim, DE
• Detlev Bohnhorst · Cologne, DE
• Karl-Heinz Gottwald · Lechenich, DE
• Roland Morlock · Bergheim, DE

Key dates

• Filing date: Oct 20, 1986
• Grant date: Aug 9, 1988
• Expiry date: Oct 20, 2006

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C22/182
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A method for phosphate coating zinc or nickel-zinc alloy electrolytically coated metal surfaces, in which they are exposed to a phosphating solution containing zinc, manganese, and phosphate ions, and optionally cobalt and/or nitrate ions. The method is conducted at an elevated temperature for up to slightly more than 5 seconds.