Post-treatment of conversion-coated metal surfaces

Details Post-treatment of conversion-coated metal surfaces Post-treatment of conversion-coated metal surfaces

1975-11-13

1977-08-02

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 615Z, 148 62, 148 614R, 260 294R, C23F 710

Patent

active

040393534

ABSTRACT:
Disclosed is a process for the post-treatment of conversion-coated metal surfaces. The aqueous treating solution contains a melamine-formaldehyde resin and preferably contains a vegetable tannin and is free of chromium. Treatment with the melamine-formaldehyde resin-containing solution provides improved corrosion-resistance over that obtained with a water rinse and treatment with the melamine-formaldehyde resin and vegetable tannin combination solution gives corrosion results as measured by salt spray resistance comparable to those obtained with the use of the commercial dilute chromium-containing rinse.

REFERENCES:
patent: 1303627 (1919-05-01), Baines
patent: 2854368 (1958-09-01), Shreir
patent: 3877998 (1975-04-01), Guhde

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