Anodizing process

Details Anodizing process Anodizing process

1974-03-28

1976-01-27

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

25D 1108, C25D 1114

Patent

active

039350843

ABSTRACT:
A colored oxide film on the surface of aluminium or an alloy thereof can be formed by anodizing at a D.C. voltage in an electrolyte based on sulfuric acid, followed by alternating current electrolysis at an A.C. voltage which is lower than the D.C. voltage.
In order to increase the degree of coloring of the colored oxide film, after the alternating current electrolysis the A.C. voltage is raised to a higher level but lower than the D.C. voltage, followed by dropping the voltage down to a level of the A.C. voltage or thereabout.

REFERENCES:
patent: 3759801 (1973-09-01), Patrie et al.
patent: 3773631 (1973-11-01), Immel et al.

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