Chemistry: electrical and wave energy – Processes and products
Patent
1979-04-25
1980-09-30
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
204274, 204275, C25D 1106
Patent
active
042253993
ABSTRACT:
Anodizing of aluminum or aluminum alloys at an exceptionally high film forming rate is conducted by the employment of a current density greater than 1.5 A/dm.sup.2 and a concentration of sulfuric acid of from 20% to 30% by weight in an electrolyte solution bath, and by the use of a racking device and cooling device which is designed for said severe conditions of current density and sulfuric acid concentration. A careful selection and regulation of the anodizing temperature enables the option of forming a soft or hard oxide film of greater thickness than achieved heretofore. Bath temperatures of around 30.degree. C. permit the formation of a soft oxide film, while bath temperatures of around 5.degree. C. permit the formation of a hard oxide film.
REFERENCES:
patent: 3532607 (1970-10-01), Roberts
patent: 3692640 (1972-09-01), Hamabe et al.
patent: 4133725 (1979-01-01), Lerner et al.
patent: 4152221 (1979-05-01), Schaedel
S. Wernick et al., "The Surface Treatment & Finishing of Aluminum & Its Alloys", pp. 308-312 & 404-405, (1964).
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