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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℃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-4VELI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TiO_2基体以及Nb_2O_5、NbO_2、Ta_2O_5、ZrO_2、TiO和Ti_2O_3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 ℃ was investigated by potentiodynamic polarization. Under the same conditions, the corrosion resistance of Ti-6Al- 4V-ELI (low-gap) alloy for comparative experiments. The results show that TNTZF exhibits superior corrosion resistance, lower corrosion current density, more stable passivation current density and wider passivation interval than Ti-6Al-4V-ELI alloy performance. In addition, pitting corrosion was observed on the surface passivation film of Ti-6Al-4VELI alloy, but no pitting corrosion was observed on the surface of TNTZF alloy. The results of XPS analysis show that the passivation film of TNTZF alloy consists of TiO 2 matrix and Nb 2 O 5, NbO 2, Ta 2 O 5, ZrO 2, TiO and Ti 2 O 3 oxides, which makes the passivation film more stable and more protective. Therefore, -6Al-4V ELI alloy showed superior corrosion resistance.