新型医用Ti-24Nb-4Zr-8Sn合金在Hanks溶液中的电化学腐蚀行为研究

The electrochemical corrosion behavior of a new medical Ti - 24Nb - 4Zr - 8Sn alloy in Hanks' artificial simulated body fluid at 37 °C was studied by means of polarization curve analysis, electrochemical impedance spectroscopy (EIS) testing and immersion experiments, and combined with analytical methods such as XPS, XRD and SEM, and compared with pure Ti and Ti - 6Al - 4V alloy. The results show that in Hanks' solution at 37 °C, the corrosion current density of the Ti - 24Nb - 4Zr - 8Sn alloy is equal to that of pure Ti, and its passivation performance is better than that of pure Ti and Ti - 6Al - 4V, which is closely related to the large amount of Nb₂O₅ in its passive film; the EIS results show that a double - layer passive film structure with a dense inner layer and a loose outer layer is formed on the surface of the Ti - 24Nb - 4Zr - 8Sn alloy, and the characteristics of the dense layer play a decisive role in the corrosion resistance of the material; with the extension of the immersion time,...

采用极化曲线分析、电化学阻抗谱(EIS)测试和浸泡实验的方法,并结合XPS,XRD和SEM等分析手段对新型医用Ti-24Nb-4Zr-8Sn合金在37℃的Hanks人工模拟体液中的电化学腐蚀行为进行了研究,并与纯Ti和Ti-6Al-4V合金进行了比较.结果表明:在37℃的Hanks溶液中,Ti-24Nb-4Zr-8Sn合金的腐蚀电流密度与纯Ti相等,并且钝化性能优于纯Ti和Ti-6Al-4V,这与其钝化膜中存在大量的Nb_2O_5密切相关;EIS结果显示,Ti-24Nb-4Zr-8Sn合金表面形成内层致密而外层疏松的双层钝化膜结构,致密层特性对材料的耐蚀性能起到决定性作用;随着浸泡时间的延长,...