Abstract: An anode micro-arc plasma boriding technique was performed on titanium alloy to investigate the microstructure and properties of boriding layer. The morphology and microstructure of the surface and section of boriding layer, phase composition and elements distribution were examined using optical microscopy (SEM), scanning electron microscopy, X-ray diffractometer (XRD) and the energy dispersion spectrum (EDS). And the wear resistance of layer was assessed by conducting pin-on-disk wear tests and friction coefficient tests. Furthermore, the corrosion resistance was investigated by measuring polarization curves. The results showed that the boriding layer prepared by the anodic micro-arc plasma boriding on the titanium alloy was continuous and compact. Moreover, the boriding layer was mainly composed of intermetallic compounds TiB2 and TiB combined with the oxide layer, which could significantly improve its surface wear resistance. But the corrosion resistance of boriding layer was lower than that of the substrate. Anode micro-arc plasma technology is a kind of novel method of titanium alloy surface modification.
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