采用动电位极化方法研究Ti−25Nb−10Ta−1Zr−0.2Fe (质量分数，%)(TNTZF)合金37°C下在林格溶液中的抗腐蚀性能，并在同样的条件下用Ti−6Al−4V ELI(低间隙)合金做对比实验。结果表明：TNTZF比Ti−6Al−4V ELI合金表现出更高的腐蚀电位，更低的腐蚀电流密度，更加稳定的钝化电流密度和更宽的钝化区间，因此具有更加优越的抗腐蚀性能。除此之外，在Ti−6Al−4V ELI合金的表面钝化膜上观察到了点蚀现象，但是在TNTZF合金表面没有发现点蚀现象。XPS 分析结果表明：TNTZF 合金表面钝化膜由 TiO2基体以及 Nb2O5、NbO2、Ta2O5、ZrO2、TiO和Ti2O3等氧化物共同组成，从而使得钝化膜更加稳定且保护作用更强，因此TNTZF合金比Ti−6Al−4V ELI合金表现出更加优越的抗腐蚀性能。%The corrosion resistance of Ti−25Nb−10Ta−1Zr−0.2Fe (mass fraction, %) (TNTZF) alloy in Ringer’s solution at 37 °C was investigated by potentiodynamic polarization measurement. Ti−6Al−4V ELI (Extra low interstitial) alloy was also investigated to make a comparison. The results show that TNTZF alloy has higher corrosion potential, lower corrosion current density, more stable passive current density and wider passive region compared with Ti–6Al–4V ELI alloy, which indicates that TNTZF alloy has better corrosion resistance. In addition, pitting corrosion is observed on the surface passive film of Ti–6Al–4V ELI alloy but is not found on that of TNTZF alloy. The XPS analysis results reveal that the passive film formed on TNTZF alloy is composed of Nb2O5, NbO2, Ta2O5, ZrO2, TiO and Ti2O3oxides in the matrix of TiO2, which makes the passive film more stable and protective than that formed on Ti−6Al−4V ELI alloy and contributes much to its superior corrosion resistance.
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