Method of forming a dark, very adherent coating on a CRT mask as

Details Method of forming a dark, very adherent coating on a CRT mask as Method of forming a dark, very adherent coating on a CRT mask as

1974-02-19

1976-01-27

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 635, 313402, 313408, C23F 702

Patent

active

039350363

ABSTRACT:
An improved, cathode ray tube mask assembly having a dark, adherent coating and a method of forming such a coating. A clean mask assembly is treated with a hot solution of chromic and phosphoric acid to form a preliminary protective coating. The mask assembly is then baked to convert the preliminary protective coating to a final dark, very adherent coating.

REFERENCES:
patent: 2418608 (1947-04-01), Thompson et al.
patent: 2832708 (1958-04-01), Karchner
patent: 3094441 (1963-06-01), Curtin et al.

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