Black conversion coating

Details Black conversion coating Black conversion coating

1986-12-05

1988-12-06

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23C 2258

Patent

active

047894091

ABSTRACT:
A black conversion coating for substrates contains sodium thiosulfate, nickel sulfate (pentahydrate), zinc sulfate (monohydrate), and sodium fluoborate. The coating comes in a powdered formulation in which the sodium thiosulfate, nickel sulfate, zinc sulfate, and sodium fluoborate comprise, respectively, 54%, 30%, 15% and 1% by weight of the formulation. The powdered matter is mixed with water at a concentration of 30-60 grams per liter of water. The coating is applied at a liquid temperature of 160.degree.-180.degree. F.

REFERENCES:
patent: 4061830 (1977-12-01), Greenberg
Metal Coloring, Fishlock 1962, pp. 119-120.

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