Method for chromium plating titanium alloy
First Claim
1. A method for chromium plating a surface of a part made of titanium or an alloy thereof, comprising:
- mechanically cleaning the surface of the part to remove impurities therefrom;
electrically connecting the part to a negative terminal of a direct current power supply; and
while the part is connected to the negative terminal of the power supply, immersing the part in a bath of a chromium plating solution which contains an anode element connected to a positive terminal of the direct current power supply, and maintaining the part immersed for a period of time such that a plating of chromium is deposited on the surface of the part.
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Accused Products
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.
15 Citations
16 Claims
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1. A method for chromium plating a surface of a part made of titanium or an alloy thereof, comprising:
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mechanically cleaning the surface of the part to remove impurities therefrom; electrically connecting the part to a negative terminal of a direct current power supply; and while the part is connected to the negative terminal of the power supply, immersing the part in a bath of a chromium plating solution which contains an anode element connected to a positive terminal of the direct current power supply, and maintaining the part immersed for a period of time such that a plating of chromium is deposited on the surface of the part. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for chromium plating a surface of a part made predominantly of titanium, comprising the steps of:
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degreasing the surface of the part; after the degreasing step, grit-blasting the surface of the part; within three minutes of completion of the grit-blasting step, electrically connecting the part to a negative terminal of a direct current power supply and thereafter immersing the part in a bath of chromic acid solution which contains an anode element connected to a positive terminal of the direct current power supply; and maintaining the part immersed for a period of time such that a plating of chromium is deposited on the surface of the part. - View Dependent Claims (14, 15, 16)
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Specification