Chemistry: electrical and wave energy – Processes and products
Patent
1987-08-17
1990-02-20
Tung, T.
Chemistry: electrical and wave energy
Processes and products
204 351, 204 41, 204 561, C25D 706, C25D 1138
Patent
active
049023870
ABSTRACT:
A chromate-treated steel strip comprising a chromate film on a zinc plated steel strip is improved in corrosion resistance and coating adherence by forming the chromate film of three layer structure consisting of a metallic Cr layer, a Cr.sup.3+ oxide layer, and an outermost surface layer of SiO.sub.2, and Cr.sup.3+ oxide plus Cr.sup.6+ oxide. The three layered chromate film is deposited on a zinc plated steel strip by effecting cathodic electrolysis in a bath containing hexavalent chromium, colloidal silica, optional alumina sol, and a fluoride, by supplying electricity at a specific current density to a controlled quantity.
REFERENCES:
patent: 4137132 (1979-01-01), Ward et al.
patent: 4437944 (1984-03-01), Bruno et al.
patent: 4548868 (1985-10-01), Yohezawa et al.
patent: 4659394 (1987-04-01), Hara et al.
Kimura Hajime
Nakahara Yuki
Okano Shinobu
Takeuchi Yuko
Kawasaki Steel Corporation
Leader William T.
Tung T.
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