Method of blackening steel components for cathode ray tubes

Details Method of blackening steel components for cathode ray tubes Method of blackening steel components for cathode ray tubes

Filed on

1981-03-20

Date issued

1982-11-02

Examiner

Smith, John D.

Patent Class

Coating processes

SubClass

Electrical product produced

SubSubClass

Fluorescent or phosphorescent base coating

Other Related Categories

148 63, 427160, 4273837, 427436, 427437, C23C 300, C23F 500

Type

Patent

Status

active

Patent number

043573673

Description

ABSTRACT:
An adhering bismuth layer is provided on steel components for cathode ray tubes by electroless plating in an acidic aqueous solution of bismuth oxynitrate. The bismuth coated steel components are heated in an oxidizing atmosphere, for example in air, at temperatures between 350.degree. C. and 650.degree. C. until the bismuth coating becomes black.

REFERENCES:
patent: 3562518 (1971-02-01), Javorik
patent: 3615892 (1971-10-01), Heinzelman
Fishlock, "Metal Colouring", Robert Draper Ltd., 1962, pp. 197-198; 280-281.

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