Method for blackening the surfaces of a body of ferrous metal

Details Method for blackening the surfaces of a body of ferrous metal Method for blackening the surfaces of a body of ferrous metal

1977-09-26

1979-04-17

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 611, 148 614R, C23F 704

Patent

active

041499085

ABSTRACT:
The surfaces of a ferrous metal body are coated with a heat-fusible, chemically-oxidizing composition, such as sodium nitrate or potassium nitrate. Then, the coated body is heated above the melting temperature of the coating, preferably above 350.degree. C., until the coating melts, spreads over the surfaces, reacts with the material of the surfaces and produces a black oxide coating thereon.

REFERENCES:
patent: 2289443 (1942-07-01), Mange
patent: 2618578 (1952-11-01), Kreml
patent: 3085035 (1963-04-01), Ireland et al.
patent: 3437532 (1969-04-01), Helgert et al.
patent: 3540942 (1970-11-01), Lewis et al.
patent: 3867207 (1975-02-01), Decker et al.
patent: 3935036 (1976-01-01), Kinsch

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