Corrosion Resistance of Molybdenum Nitride Modified Ti6Al4V Alloy in HCl Solution

摘要

The Mo-N surface modified layer on Ti6Al4V alloy was obtained by the plasma surface alloying technique.The structure and composition of the Mo-N modified Ti6Al4V alloy were investigated by X-ray diffraction(XRD)and glow discharge optical emission spectroscopy(GDOES).The Mo-N modified layer contains Mo-N coating on subsurface and diffusion layers between the subsurface and substrate.The X-ray diffraction analysis of the Mo-N modified Ti6Al4V alloy reveals that the outmost surface of the Mo-N modified Ti6Al4V alloy is composed of phase Mo 2 N(fcc)and Mo 2 N(tetr).The electrochemical corrosion performance of the Mo-N modified Ti6Al4V alloy in 0.5 mol/L HCl solution was investigated and compared with that of Ti6Al4V alloy.The chemical corrosion performance of the Mo-N modified Ti6Al4V alloy in boiling 37%HCl solution was investigated and compared with that of Ti6Al4V alloy.Results indicate that self-corroding electric potentials and corrosion-rate of the Mo-N modified Ti6Al4V alloy are higher than that of Ti6Al4V alloy in 0.5 mol/L HCl solution.The corrosion-rate of the Mo-N modified Ti6Al4V alloy is lower than that of Ti6Al4V alloy in boiling 37%HCl solution.