Aluminum alloy product with uniformly grey, light-fast surface and process for its manufacture

US4806211A · kind A · utility

Assignee

• Swiss Aluminium Ltd. · CH

Inventors

• Jurgen Timm · Seevetal, DE
• Jean-Francois Paulet · Siblingen, CH
• Jorg Maier · Echterdingen, DE

Key dates

• Filing date: May 12, 1987
• Grant date: Feb 21, 1989
• Expiry date: May 12, 2007

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D11/14
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An anodized aluminum product prepared by anodizing an alloy comprising 1.20-1.60% iron and 0.25-0.55% manganese with a weight ratio of iron to manganese between 2.8 and 5, up to 0.20% silicon, up to 0.30% copper, up to 5% magnesium, up to 0.10% chromium, up to 2% zinc, up to 0.25% zirconium, up to 0.10% titanium, remainder aluminum and in total up to 0.50% of other by anodic oxidation in an electrolyte at a temperature of less than 560.degree. C. for no more than 4 hours so as to produce an oxide thickness of 5 to 30 .mu.m.