Chemistry: electrical and wave energy – Processes and products
Patent
1989-02-10
1989-10-24
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
C25D 1138
Patent
active
048759848
ABSTRACT:
A method for manufacturing an electrolytically chromated steel sheet, comprising the steps of: subjecting a steel sheet to an anodic electrolytic treatment with a quantity of electricity of from 0.3 to 30 coulomb/dm.sup.2 in an acidic electrolyte containing at least one of chromic anhydride, chromate and bichromate, to form a hydrated chromium oxide film having numerous holes and numerous thin portions over the entire area of at least one surface of the steel sheet; and then subjecting the anodically treated steel sheet to a cathodic electrolytic chromate treatment in an acidic electrolytic chromating solution to form on the at least one surface of the steel sheet a chromate film comprising a metallic chromium layer as a lower layer having thereon numerous granular projections, and a hydrated chromium oxide layer as an upper layer. The electrolytically chromated steel sheet manufactured in accordance with the method of the present invention has excellent secondary paint adhesion and weldability, and has a satisfactory surface hue.
REFERENCES:
Metal Surface Technology, A Journal of the Metal Finishing Society of Japan, vol. 35, No. 7, pp. 34-38, issued on July 1, 1984.
Furuya Hirohide
Iwasa Hiroki
Watanabe Toyofumi
NKK Corporation
Tufariello T. M.
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