Black chromate coatings

Details Black chromate coatings Black chromate coatings

1976-11-15

1977-12-27

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 62, 148 624, 148 315, C23F 726

Patent

active

040653277

ABSTRACT:
The properties of black chromate coatings on zinc and cadmium metal substrates are improved by treating the coating with an aqueous solution of sodium thiosulphate, sodium thioglycolate or thio urea. Treatment of the black chromate coating ensures that light fastness and corrosion resistance are reliably obtained.

REFERENCES:
patent: 2483510 (1949-10-01), Stareck
patent: 2548419 (1951-04-01), Chester et al.
patent: 2894865 (1959-07-01), Pryor
patent: 2898250 (1959-08-01), Pimbley
patent: 3493441 (1970-02-01), Rausch et al.

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