Coated valve metal article formed by spark anodizing

Details Coated valve metal article formed by spark anodizing Coated valve metal article formed by spark anodizing

1974-08-22

1976-05-11

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 56M, 204 58, 427344, 428450, 106 74, C25D 1104, C25D 1130, C25D 1126

Patent

active

039560805

ABSTRACT:
Metals and alloys which have the property of electrolytic rectification are coated by immersion in an aqueous bath comprising an alkali metal hydroxide, an alkali metal silicate and a catalyst and application of a sufficiently high voltage to obtain spark discharge at the surface to be coated thereby to provide a durable coating on the surface.

REFERENCES:
patent: 2978361 (1961-04-01), Seidl
patent: 3748172 (1973-07-01), Speirs et al.
patent: 3843392 (1974-10-01), Sterling et al.

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