Post-treatment of conversion-coated metal surfaces

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

C - Chemistry, Metallurgy

09

D

117/194, 400/734

C09D 5/08 (2006.01) C23C 22/83 (2006.01) C23F 11/10 (2006.01)

Patent

CA 1066442

ABSTRACT OF THE DISCLOSURE 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.

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