Protective and color receptive coating for aluminum

Details Protective and color receptive coating for aluminum Protective and color receptive coating for aluminum

1978-12-11

1980-07-15

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 627, 204 35N, C23B 902, C23F 714

Patent

active

042126851

ABSTRACT:
The invention is for a process for providing a protective, color receptive coating over aluminum using chemical means without a requirement for the use of an electric current as in electrical anodizing. Absent conventional steps such as water rinses, the process comprises cleaning, including desmutting of the surface of an aluminum part as necessary, and treatment with an aqueous alkaline solution of ferric citrate for a time sufficient to provide the coating over the part. The treated aluminum part has enhanced corrosion resistance and the coating over the part acts as a base for other coatings such as paint, and is readily dyed.

REFERENCES:
patent: 1735286 (1929-11-01), Kujirai et al.
patent: 2290364 (1942-07-01), Tosterud
patent: 2408910 (1946-10-01), Burnham
patent: 3275537 (1966-09-01), Petin
patent: 3284202 (1966-11-01), Leonard
patent: 3374155 (1968-03-01), Weber
patent: 4024039 (1977-05-01), Yoshida et al.

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