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利用放电等离子烧结技术制备了生物医用Ti-35Nb-7Zr-5Ta(Ti-Osteum)合金,采用开路电位、动电位极化曲线和电化学阻抗谱方法研究了该合金在Hank’s模拟人工体液中的电化学腐蚀行为及其腐蚀机理,并与纯Ti(TA1)和Ti-6Al-4V(TC4)合金进行了对比研究。结果表明:与TA1和TC4合金相比,SPS烧结Ti-Osteum合金在模拟人工体液中具有最小的腐蚀电流与钝化电流密度、最大的极化电阻以及接近的腐蚀电位,从而显示了良好的耐腐蚀性能,3种材料耐腐蚀性能高低依次为:Ti-Osteum>TC4>TA1;SPS烧结Ti-Osteum合金在模拟人工体液中耐腐蚀性能优异的主要原因是具有高的致密度、单相β型组织以及表面容易形成稳定的复合氧化物钝化保护膜。
The biomedical Ti-35Nb-7Zr-5Ta (Ti-Osteum) alloy was prepared by spark plasma sintering technique. The open circuit potential, potentiodynamic polarization curve and electrochemical impedance spectroscopy were used to study the electrochemical behavior of Ti-35Nb- The chemical corrosion behavior and corrosion mechanism were compared with pure Ti (TA1) and Ti-6Al-4V (TC4) alloys. The results show that the SPS sintered Ti-Osteum alloy has the lowest corrosion current and passivation current density, the largest polarization resistance and the near corrosion potential in simulated artificial body fluids compared to TA1 and TC4 alloys, thus showing good resistance Corrosion resistance and corrosion resistance of the three materials were as follows: Ti-Osteum> TC4> TA1. The main reason for the excellent corrosion resistance of SPS sintered Ti-Osteum alloys in simulated artificial body fluids was high density, Tissue and the surface easily form a stable composite oxide passivation protective film.