Electrolytic coloring of anodized aluminum

US4877495A · kind A · utility

Assignee

• Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

• Willi Buchmeier · Goldkronach, DE
• Dieter Brodalla · Düsseldorf, DE

Key dates

• Filing date: Feb 2, 1989
• Grant date: Oct 31, 1989
• Expiry date: Feb 2, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D11/22
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A process for the electrolytic coloring of anodized surfaces of aluminum or aluminum alloys using alternating current or direct current superimposed on alternating current, the electrolytic coloring being carried out with an electrolyte which contains cationic organic dyes and, optionally, conducting salts.