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采用放电等离子烧结技术制备了Ti-35Nb-7Zr-5Ta(Ti-Osteum)生物医用钛合金。以生物医用金属材料纯Ti(TA1)和Ti-6Al-4V(TC4)合金为对比材料,利用开路电位、动电位极化曲线和电化学阻抗谱等方法研究了该合金在Ringer’s模拟体液中的电化学腐蚀行为及其腐蚀机理。结果表明:与TA1和TC4合金相比,SPS烧结的Ti-Osteum合金在模拟体液中具有最小的腐蚀电流密度和较小的钝化电流密度、较大的容抗弧以及接近的腐蚀电位,从而显示了优于TC4和TA1的良好耐腐蚀性能。SPS烧结Ti-Osteum合金在模拟体液中耐腐蚀性优异的主要原因是具有单相β型组织,并且表面出现稳定的复合氧化物钝化膜。
Ti-35Nb-7Zr-5Ta (Ti-Osteum) biomedical titanium alloy was prepared by spark plasma sintering. The biomaterials Ti (TA1) and Ti-6Al-4V (TC4) were used as reference materials to study the effect of the alloy in Ringer’s simulated body fluid using open-circuit potential, potentiodynamic polarization curve and electrochemical impedance spectroscopy Electrochemical Corrosion Behavior and Corrosion Mechanism. The results show that compared with TA1 and TC4 alloys, the SPS sintered Ti-Osteum alloy has the lowest corrosion current density and the smaller passivation current density, the larger capacitive reactance arc and the close corrosion potential in the simulated body fluid Shows better corrosion resistance than TC4 and TA1. The main reason for the superior corrosion resistance of SPS sintered Ti-Osteum alloys in simulated body fluids is the presence of a single-phase β-type structure with a stable composite oxide passivation film on the surface.