Process for treating surfaces of a perforated mask

Details Process for treating surfaces of a perforated mask Process for treating surfaces of a perforated mask

1973-10-12

1976-07-06

Weiffenbach, Cameron K.

Metal treatment

Compositions

Heat treating

148 615R, C23F 710, C23F 704

Patent

active

039679853

ABSTRACT:
Surfaces of a perforated mask made of iron are allowed to contact with an acidic aqueous solution of antimony trichloride, e.g., a hydrochloric acid solution to form a thin film of metallic antimony on said surfaces. A protective coating of a phosphate is allowed to be deposited onto said thin film. Thereafter, said surfaces is heated in an oxygen atmosphere to produce a grayish black coating having an excellent thermal emission power. The perforated mask thus treated has no permanent deformation like wrinkles produced at a perforated sheet member and is uniform in color.

REFERENCES:
patent: 2529414 (1950-11-01), Pfeffer
patent: 2979430 (1961-04-01), Keller et al.
patent: 3015594 (1962-01-01), Russell
patent: 3060066 (1962-08-01), Ross et al.
patent: 3372064 (1968-03-01), Jones et al.
patent: 3644152 (1972-02-01), Schlossberg et al.
patent: 3749611 (1931-07-01), Leon et al.

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