Corrosion Characteristic of Double Glow Plasma Hydrogen-Free Carburizing on Titanium

Abstract

Using high purity solid graphite as a source cathode, purity titanium as the cathode, titanium surface was carburized by a double glow plasma hydrogen-free carburizing. Experimental results indicate that a higher hardness carburized layer, containing higher hardness TiC phase and dissociate state carbon antifriction phase was formed on the titanium surface. The carbon concentration and the hardness of carburized layer distribute in the gradient along the carburized layer. The surface hardness reaches 1000HK. The polarization curve of Ti carburized has the passivation peak of wider range, and corrosion rate of 0.089 is lower than that of Ti(0.225),indicating that corrosion resistance of titanium carburized is higher than that of Ti untreated.