Efficient preparation of blackened steel strip

Details Efficient preparation of blackened steel strip Efficient preparation of blackened steel strip

1993-09-22

1995-03-07

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Coating moving substrate

205152, 205199, 205217, 205219, 205320, C25D 104

Patent

active

053955102

ABSTRACT:
A blackened steel strip having improved blackness is produced in an efficient manner by anodizing a zinc alloy-plated steel strip in a solution containing 5 to 100 g/l of ClO.sub.3.sup.- and 10 to 300 g/l of SO.sub.4.sup.2- at pH 0.5 to 2.5 at a temperature of 30.degree. to 75.degree. C. and with a quantity of electricity of 10 to 300 C/dm.sup.2, and forming an acrylic resin chromate layer on the anodized steel strip to a thickness of 0.3 to 2.5 .mu.m. The solution may contain 5 to 100 g/l in total of at least one co-additive selected from Cl.sup.-, NO.sub.3.sup.-, H.sub.2 O.sub.2, Ni.sup.2+, Co.sup.2+, Fe.sup.2+, and Mn.sup.2+. The acrylic resin chromate layer contains 2 to 10 parts by weight of in the form of a chromate Cr per 100 parts by weight of acrylic resin.

REFERENCES:
patent: 4637840 (1987-01-01), Fujii et al.
patent: 4861441 (1989-08-01), Saito et al.

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