Method for producing colored anodic film on aluminum-based mater

Details Method for producing colored anodic film on aluminum-based mater Method for producing colored anodic film on aluminum-based mater

1977-12-05

1979-03-13

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

C25D 1108, C25D 1114, C25D 1130

Patent

active

041441427

ABSTRACT:
A method for inexpensively producing a colored anodized film on aluminum or aluminum alloy material by electrolyzing the aluminum material in a sulphuric acid bath in the presence of a resistivity agent selected from trivalent aluminum ions and oxalic acid, by applying thereto a pulsating electric current having a peak voltage of 25 to 45 volts and a pulse duration of 5 to 70 milliseconds (m.sec.) and a ratio of pulse frequency to pulse duration of between 2 and 7.

REFERENCES:
patent: 3836439 (1974-09-01), Ikegaya et al.

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