Sealing anodically produced oxide layers, on aluminum

US4445983A · kind A · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Hans J. Gohausen · Hilden, DE
• Winfried Kirchhoff · Düsseldorf, DE
• Jurgen Lindener · Monheim, DE
• Harald Wennemann · Erkrath, DE

Key dates

• Filing date: Aug 30, 1983
• Grant date: May 1, 1984
• Expiry date: Aug 30, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D11/246
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process for sealing anodically produced oxide layers on aluminum and aluminum alloys by treating them with an aqueous solution at a temperature between about 90.degree. C. and its boiling point, wherein the aqueous solution has a pH of from about 4 to about 8 and and contains from about 0.0005 to about 0.5 g/l of at least one phosphinocarboxylic acid or its water-soluble salt.