Method of making a black surface treated steel sheet

Details Method of making a black surface treated steel sheet Method of making a black surface treated steel sheet

1987-08-13

1989-08-29

Rutledge, L. Dewayne

Chemistry: electrical and wave energy

Processes and products

204 442, 428623, C25D 526

Patent

active

048614416

ABSTRACT:
A colored zinc composite-plated steel sheet which comprises a steel sheet or a plated steel sheet, a colored composite-plating film comprising zinc and an oxide of a coloring metal such as nickel, cobalt, iron, chromium, tin or copper and provided on the steel sheet at a coverage of 0.1-5 g/m.sup.2 and a transparent guard coat of 3 .mu.m or less thick provided on the film is obtained by carrying out electrolysis in an acidic aqueous solution containing zinc ion, a coloring metal ion and nitrate ion, nitrite ion, perchlorate ion, chlorate ion, condensed phosphate ion and having a pH of 1-4 using the steel sheet or plated steel sheet as a cathode at a current density of 5-100 A/dm.sup.2 and a current quantity of 20-200 coulomb/dm.sup.2.

REFERENCES:
patent: 4313802 (1982-02-01), Shibuya et al.
patent: 4629659 (1986-12-01), Kyono et al.
patent: 4707415 (1987-11-01), Ikeda et al.
Jitsumu Hyomen Gijutsu, vol. 32, No. 10, p. 541.

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