Method for chromium plating titanium alloy

Details Method for chromium plating titanium alloy Method for chromium plating titanium alloy

1998-11-09

2000-03-21

Wong, Edna

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Treating substrate prior to coating

205206, 205222, 148264, C25D 534, C25D 552, C23C 2224

Patent

active

060398604

ABSTRACT:
A method for chromium plating a part made of titanium or titanium alloy eliminates the conventional chemical cleaning of the part prior to electroplating, and instead employs a mechanical cleaning of the part including degreasing the part and then grit-blasting the part with aluminum oxide particles. Immediately following the grit-blasting step, for example within one minute of its completion, the part is connected to the negative terminal of a DC power supply and is then immersed into a bath of chromium plating solution which contains an anode element connected to the positive terminal of the power supply. The part is left in the bath for a period of time so as to deposit a plating of chromium on the surface of the part. For final finishing of the part, a post-plating grinding operation is performed in which the surface speed of the grinding wheel is not greater than about 6500 surface feet per minute and the in-feed rate is less than about 0.00015 inch per pass of the grinding wheel, and preferably is about 0.0001 inch per pass.

REFERENCES:
patent: 4846940 (1989-07-01), Neuhauser et al.
patent: 4904352 (1990-02-01), Witts
L. Missel, Electroplating on Titanium Alloys, Metal Finishing, Sep., 1957, pp. 46-54.

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