Patent ID: 8168056
Filing Date: 2012-05-01
Classification: C25D,Y10T

Abstract:
1. A method for electrolytically coating an article, comprising: a) providing an article to be coated; b) disposing the article in an electrolytic cell, the cell including a soluble anode, a cathode in operable communication with the article, and an electrolyte bath, the electrolyte bath, during electrolysis, comprising cobalt ions from the soluble anode, phosphorous obtained by separately introducing phosphorous acid into the bath, and ceramic tribological particles selected from the group consisting of silicon carbide, chromium carbide, boron carbide, tungsten carbide, titanium carbide, silicon nitride, aluminum oxide, chromium oxide, and mixtures thereof dispersed therein, wherein the pH of the electrolyte bath is between about 0.5 and about 2.0; c) applying steady direct electric current through the anode, the electrolyte bath and the cathode at a current density between about 0.2 Amps/in d) heat treating the article after it has been coated to cause the precipitation of cobalt-phosphides at a temperature between about 150° C. and about 500° C.