Method for treating coated ferrous substrates

Details Method for treating coated ferrous substrates Method for treating coated ferrous substrates

1975-02-03

1976-07-06

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 62, C23F 726

Patent

active

039679845

ABSTRACT:
An aqueous solution of 2.0 to 12.0 gm/l hexavalent chromium and 0.7 to 4.0 gm/l of sodium or ammonium bifluoride, adjusted to a pH of 2.7 to 5.5, is applied to coated (eg. Zn) ferrous substrates, metered to result in a final thickness of 0.8 to 2.0 mg of Cr per square foot of substrate surface, and thereafter dried to remove physically bound water.

REFERENCES:
patent: 2507956 (1950-05-01), Bruno et al.
patent: 2798829 (1957-07-01), Newhard et al.
De Long, Abstract of S.N. 725750, published 8-30-49.

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