Chromate treatment of a metal coated steel sheet

Details Chromate treatment of a metal coated steel sheet Chromate treatment of a metal coated steel sheet

1987-05-12

1988-11-15

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 561, 204 384, 204 42, C25D 500

Patent

active

047847310

ABSTRACT:
A chromate treatment of metal coated steel sheets comprising subjecting the sheets to a cathodic electrolytic treatment to form a chromate film thereon and subjecting the sheet to an anodic electrolytic treatment to form an anodic electrolytic film on the chromate film and to convert the chromate film. The treatment is applicable to various metal coated steel sheets, such as those coated with zinc, zinc alloy, aluminum, aluminum alloy, lead and lead alloy, and is effective to improve the corrosion resistance of the sheets, the quality of paint coating applied on the sheets and the adaptability of the sheets to a cation electro-deposition paint coating.

REFERENCES:
patent: 4519879 (1985-05-01), Ichida et al.
patent: 4545871 (1985-10-01), Krijl et al.

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