Method of blackening surfaces of steel parts with wet nitrogen

Details Method of blackening surfaces of steel parts with wet nitrogen Method of blackening surfaces of steel parts with wet nitrogen

1983-05-03

1984-05-15

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23C 1110

Patent

active

044486120

ABSTRACT:
A gaseous mixture of nitrogen and water vapor (dew point of about -8.degree. to 32.degree. C.), heated to 550.degree. to 750.degree. C., contacts the surfaces of a steel part for a sufficient time to produce adherent, deep-black layers on the part. Steel aperture masks and support frames for color television picture tubes may be blackened by the novel method.

REFERENCES:
patent: 2398012 (1946-04-01), Kiser
patent: 3510366 (1970-05-01), Mears
patent: 4035200 (1977-07-01), Valentijn
patent: 4141759 (1979-02-01), Pfistermeister et al.

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