Process for forming a blackened layer on a zinciferous surface b

Details Process for forming a blackened layer on a zinciferous surface b Process for forming a blackened layer on a zinciferous surface b

1990-06-27

1992-02-25

Beck, Shrive

Coating processes

With post-treatment of coating or coating material

Heating or drying

427427, 427428, 427429, 427436, B05D 302

Patent

active

050912232

ABSTRACT:
Zinciferous surfaces, particularly those of galvanized steel, may be effectively coated with an adherent corrosion resistant black layer of fine metal particles by contacting the surfaces with an aqueous solution containing (A) at least 0.5 g/L of the treatment solution of Ni.sup.2+ and/or Co.sup.2+ ions; and (B) an amount, sufficient to complex all the ions of component (A), of a weak complexing component selected from the group consisting of ammonia, saturated aliphatic compounds having at least two amino groups of which at least one is a primary amino group, and/or amino acids; and, optionally but preferably, (C) at least 50 parts per million ("ppm") by weight of a component selected from the group consisting of nitrite ions, nitrate ions, carbonate ions, thiocyanate ions, thiosulfate ions, thiourea, hypophosphite ions, phosphite ions, and/or perchlorate ions.

REFERENCES:
patent: 3147154 (1964-09-01), Cole et al.
patent: 3403035 (1968-09-01), Schneble, Jr.
patent: 3444007 (1969-05-01), Maurer
patent: 3597267 (1971-08-01), Mallory, Jr. et al.
patent: 3876434 (1975-04-01), Dutkewych et al.
patent: 4880476 (1989-11-01), Matsuda et al.
patent: 4904544 (1990-02-01), Mori et al.

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