Ag离子注入Ti6Al4V合金抗Hank’s溶液腐蚀性能研究

Corrosion Resistance of Ti6Al4V Alloy Modified by Ag Ion Implantation in Hank's Solution

采用注入不同剂量5×1016,1×1017,5×1017和9×1017ions/cm2,加速电压30kV对Ti6Al4V合金进行Ag离子注入表面改性。使用动电位极化曲线研究Ag离子注入前后Ti6Al4V合金抗Hank’s溶液腐蚀性能,利用小角掠射X射线衍射技术研究Ag离子注入前后Ti6Al4V合金表面物相组成,用X射线光电子能谱技术分析离子注入合金表面和腐蚀样品表面元素存在的化合态。结果表明,Ag离子注入提高了合金抗Hank’s溶液腐蚀性能,腐蚀电流密度随Ag离子注入剂量的增加稍有变化。离子注入Ti6Al4V合金表面的氧化物腐蚀阻挡层、离子注入表面合金层和表面生成的Ag和TiAg有利于合金抗Hank’s溶液腐蚀性能的改善。

Ti6Al4V alloy samples were modified by implanting silver ion at the dose of 5×10^16,1×10^17,5×10^17 and 9×10^17 ions/cm^2 under an acceleration voltage of 30 kV.The potentiodynamic polarization curve was used to investigate the corrosion resistance of un-implanted and Ag＋-ion-implanted Ti6Al4V alloy in Hank＇s solution.The glancing angle X-ray diffraction and X-ray photoelectron spectroscopy were used to investigate the phase composition and chemical states of elements on Ti6Al4V alloy surface.The results show that silver ion implantation can improve the corrosion resistance of Ti6Al4V alloy in Hank＇s solution.The corrosion current density of Ag^＋-ion-implanted Ti6Al4V alloy changed slightly with the Ag ion dose increasing.The corrosion resistance improvement of Ag^＋-ion-implanted Ti6Al4V alloy samples in Hank＇s solution is attributed to all kinds of corrosion-resistant oxide layer,surface alloy layer produced during ion implantation and Ag and TiAg existing in the outermost surface of the Ag^＋-ion-implanted Ti6Al4V alloy.