Wear resistant titanium alloy coating

Details Wear resistant titanium alloy coating Wear resistant titanium alloy coating

1979-06-12

1980-12-02

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 315, 204 29, 204 37R, 427328, 4273839, C23B 552

Patent

active

042369401

ABSTRACT:
The adherence and wear resistance of chromium alloy electroplates on titanium is improved by pretreating the substrate to form a chromium conversion coating, and post-treating the substrate at a temperature at about 700-820.degree. C. (1300-1500.degree. F.) for about 1-300 hours. The pretreatment is comprised of the formation of a chromium conversion coating from an acid chromate solution; a preferred solution is comprised of hydrofluoric acid, sodium chromate, and water. The post treatment causes diffusion sufficient to obtain a bond but avoids completely interdiffusing the chromium alloy electroplate, to preserve the wear resistance of the electroplate surface.

REFERENCES:
patent: 2825682 (1958-03-01), Missel
patent: 2829091 (1958-04-01), Missel
patent: 2858600 (1958-11-01), Vigor
patent: 3439188 (1969-04-01), Glover
patent: 3560274 (1971-02-01), Ogden
patent: 3691029 (1972-09-01), Raymond
Metal Finishing Guide Book and Directory for 1975, Metals and Plastics Pub. Inc., Hackensack, NJ, pp. 72, 73.

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