Surface treatment with durable low-friction material

Details Surface treatment with durable low-friction material Surface treatment with durable low-friction material

1976-07-06

1978-06-13

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 34, 204 35R, 204 37R, 204 38E, 428613, 428626, 428681, C25D 500, C25D 548

Patent

active

040947491

ABSTRACT:
The present invention pertains to the treatment of a metal surface with a durable low-friction material in such a way as to greatly enhance the lubricant properties of the metal surfaces. The surface coating formed is a chromium plated surface containing microcracks so prepared as to permit injection or insertion of perfluorocarbon compositions such as polytetrafluoroethylene in a fused or nearly-fused state. In the method of forming the surface coating as described, the surface is plated by electrodeposition in a chromic acid bath followed by baking to oxidize the external plated surface. In this way, the surface may then be reverse etched to expand the microcracks without affecting the external surface, following which the plated surface may be heated to, or in excess of, the fusion point of the polytetrafluoroethylene material which is inserted preferably by application to the surface from a solid rod.

REFERENCES:
patent: 2430750 (1947-11-01), Webersinn et al.
patent: 2450296 (1948-09-01), Passalacqua
patent: 3279936 (1966-10-01), Forestek
patent: 3591468 (1971-07-01), Nishio et al.

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