Method of producing colored anodic coating on aluminum and its a

Details Method of producing colored anodic coating on aluminum and its a Method of producing colored anodic coating on aluminum and its a

1974-12-05

1976-03-23

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

C25D 1110

Patent

active

039458954

ABSTRACT:
Colored anodic coating of aluminum and its alloys can be obtained by immersing the aluminum or its alloys as an anode in an aqueous electrolyte solution containing aromatic sulfonic acid and at least one of formic acid and formate salts, which solution preferably contains at least one of sulfuric acid and water soluble sulfate or bisulfate salts and by passing electric current through the electrolyte solution for a predetermined time.

REFERENCES:
patent: 3265597 (1966-08-01), Neunzig et al.
patent: 3658665 (1972-04-01), Chretien et al.
patent: 3804731 (1974-04-01), Yanagida et al.

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