Process for producing a surface-blackened steel sheet

Details Process for producing a surface-blackened steel sheet Process for producing a surface-blackened steel sheet

1990-06-21

1991-07-16

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

204 387, 204 561, C25D 706, C25D 500, C25D 1138

Patent

active

050322362

ABSTRACT:
A surface-blackened steel sheet is produced by electrolyzing a steel sheet at a cathode in an acidic aqueous solution containing Zn.sup.2+, at least one of Fe.sup.2+, Co.sup.2+ and Ni.sup.2+, a film-improving ion consisting of at least one member selected from the group consisting of Cr.sup.3+, Fe.sup.2+, Pb.sup.2+, In.sup.2+, Ag.sup.2+, Sn.sup.2+, Ti.sup.2+, Al.sup.3+, Cu.sup.2+, Mo.sup.6+, V.sup.3+, V.sup.6+, Mn.sup.2+, Mn.sup.4+, Mn.sup.6+, Bi.sup.2+, sulfite ion, thiosulfate ion, thiocyanate ion, sulfamate ion and sulfonate ion, an oxidizing ion and an organic hydroxy-compound as main components, thereby forming a black film on the steel sheet, followed by water washing, a chromate treatment, if required, and coating with a guard coat.

REFERENCES:
patent: 4749449 (1988-06-01), Scott
patent: 4861441 (1989-08-01), Saito et al.
patent: 4968391 (1990-11-01), Saito et al.

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