摘要
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。
Biomedical Ti-35Nb-7Zr-5Ta（Ti-Osteum） alloys was prepared by spark plasma sintering（SPS）. Corrosion behavior and mechanism of the alloys was investigated in Hank＇s solution by means of open-circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy（EIS） techniques. Both commercially pure titanium（TA1） and Ti- 6Al- 4V（TC4） alloy were also investigated to make a comparison. The results showed that, in comparison with TA1 and TC4 alloy, the Ti-Osteum alloy prepared by SPS exhibited a good corrosion resistance with lower corrosion current, lower passive current density and higher polarization resistance, but more or less the similar corrosion potential. As a result, the corrosion resistance of the three materials may be ranked as follows： Ti-Osteum〉TC4〉TA1. The excellent corrosion resistance of Ti-Osteum alloy prepared by SPS in simulated artificial body fluid may be attributed to its higher sintered density, β-type single phase microstructure, and a stable passive film mainly consisted of titanium oxide, nio-bium oxide, zirconium oxide, and tantalum oxide on its surface.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2016年第6期543-548,共6页
Corrosion Science and Protection Technology
基金
国家自然科学基金项目(31160197)
云南省省院省校科技合作专项项目(2013IB006)资助
