Method of making a trivalent chromium plated engine valve

Details Method of making a trivalent chromium plated engine valve Method of making a trivalent chromium plated engine valve

1992-06-17

1993-12-21

Gorgos, Kathryn

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Treating electrolytic or nonelectrolytic coating after it is...

205319, 205229, C25D 306

Patent

active

052718239

ABSTRACT:
An internal combustion engine valve (100) is provided having a stem (4) onto which a plating or coating of trivalent chromium is electrodeposited and which is then heated at a temperature of at least about 150.degree. F. for at least about 3 hours to provide a wear resistant surface that is superior to coatings of hexavalent chromium heretofor used for such purpose.

REFERENCES:
patent: Re29749 (1978-08-01), Gyllenspetz et al.
patent: Re31508 (1984-01-01), Barclay et al.
patent: 3930527 (1976-01-01), French
patent: 4108770 (1978-08-01), Roy
patent: 4690735 (1987-09-01), Laitinen et al.
patent: 4804446 (1989-02-01), Lashmore et al.
patent: 4875983 (1989-10-01), Alota et al.
Metals Handbook, Desk Edition, American Society for Metals, "Hard Chromium Plating", Donald F. Gagas, pp. 29.14-29.16 (1985).

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