Electrobrightening of aluminium and aluminium-base alloys

US4247378A · kind A · utility

Assignee

• The British Aluminum Company Limited · GB

Inventor

• Peter Harris · Oslo, NO

Key dates

• Filing date: Sep 7, 1979
• Grant date: Jan 27, 1981
• Expiry date: Sep 7, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25F3/20
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A direct current electrobrightening process for aluminium and aluminium base alloy components capable of producing specular reflectivity values in excess of 80% in alloys down to 99.5% purity by maintaining the electrolyte with a pH of 9 to 10.7, as at a temperature of 70.degree. C., and dispersing local products of reaction and depleted solution from the components at a rate that enables the current density to increase automatically by a factor of 2 to 4.