Inventors:
Brian A. Manty - Lake Park FL
Herbert R. Liss - Stuart FL
Henry Lada - Lake Park FL
Assignee:
United Technologies Corporation - Hartford CT
International Classification:
C23B 552
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.