Chemistry: electrical and wave energy – Processes and products
Patent
1986-10-14
1988-07-12
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204 384, 204 41, 204 561, C25D 1138
Patent
active
047568054
ABSTRACT:
A method of treating a zinc plated steel surface provides improved corrosion resistance and painting properties. The surface is rendered cathodic in the presence of an aqueous treatment liquor containing 5-70 g/l of hexavalent chromium, 0.01 to 5 g/l of trivalent chromium, 5-100 g/l of silica and/or silicate and 0.05-10 g/l of nitrate in which the ratio of Cr.sup.3+ /Cr.sup.6+ is within the range 1/50-1/3.
REFERENCES:
patent: 3880772 (1975-04-01), Rekertas et al.
patent: 4003760 (1977-01-01), Labenski et al.
patent: 4137132 (1979-01-01), Ward et al.
patent: 4578122 (1986-03-01), Crotty
F. A. Lowenheim, Electroplating, McGraw-Hill Book Co., New York, 1978, pp. 442-447.
Fukuda Akimitsu
Oho Yohji
Terada Haruyoshi
Kluegel Arthur E.
Leader William T.
Niebling John F.
Nihon Parkerizing Co. Ltd.
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