Tannin treatment of aluminum

Details Tannin treatment of aluminum Tannin treatment of aluminum

1976-02-09

1977-10-18

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

106 14, C23F 700

Patent

active

040544664

ABSTRACT:
Disclosed are a composition and process useful for the treatment of an aluminum surface comprising contacting the surface with an aqueous solution containing at least 0.000025 weight percent of a vegetable tannin, which solution exhibits a pH of at least 3. Best results can be obtained via a two-stage tanin treatment in which the treating solution of the first stage also contains titanium and fluoride in dissolved form.

REFERENCES:
patent: 2146840 (1939-02-01), Newsome et al.
patent: 2502441 (1950-04-01), Dodd et al.
patent: 2854368 (1958-09-01), Shreir
patent: 3443992 (1969-05-01), Schmidt et al.

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