Colorless sealing layers for anodized aluminum surfaces

US4756771A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Dieter Brodalla · Düsseldorf, DE
• Winfried Kirchhoff · Düsseldorf, DE
• Hans J. Goehausen · Langenfeld, DE

Key dates

• Filing date: Apr 14, 1987
• Grant date: Jul 12, 1988
• Expiry date: Apr 14, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D11/243
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process and composition for producing colorless, cold-sealed, anodized aluminum or aluminum alloy surfaces. The composition comprises an aqueous solution containing nickel ions and a solution of at least one azo or azo metal dye, the colors imparted by the nickel ions and dye offsetting each other.