Electrochemical stability and corrosion resistance of Ti-Mo alloys for biomedical applications
Electrochemical stability and corrosion resistance of Ti-Mo alloys for biomedical applications
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DOI：
10.1016/j.actbio.2008.07.010
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发表时间：
2009-01-01
影响因子：
9.7
通讯作者：
Guastaldi, A. C.
中科院分区：
文献类型：
--
作者：
Oliveira, N. T. C.;Guastaldi, A. C.
研究了纯钛和钛钼合金（6-20 wt.% Mo）的电化学行为，作为电解质模拟生理介质中浸泡时间的函数。开路电位值表明，所有研究的钛钼合金和纯钛在含氯化物的溶液中由于自发形成的氧化膜钝化金属表面而经历自发钝化。它还表明，在纯钛中添加高达 15 wt.% 的 Mo 似乎可以改善其自发氧化物的保护特性。电化学阻抗谱 (EIS) 研究表明，所有样品的阻抗值均较高，并随着浸泡时间的延长而增加，表明自发氧化膜的耐腐蚀性有所改善。获得的拟合表明金属表面存在单一钝化膜，随着浸泡时间的延长其电阻不断提高，Ti-15Mo 合金的电阻值最高。动电位极化显示出典型的阀金属行为，阳极形成阻挡型氧化膜，即使在含氯化物的溶液中也没有点蚀。在所有情况下，无源电流值都很小，并且在浸泡 360 小时后下降。所有这些电化学结果表明Ti-15Mo合金是一种有前途的骨科器械材料，因为电化学稳定性与生物相容性直接相关，并且是应用该材料作为生物材料的必要条件。 (C) 2008 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
Electrochemical behavior of pure Ti and Ti-Mo alloys (6-20 wt.% Mo) was investigated as a function of immersion time in electrolyte simulating physiological media. Open-circuit potential values indicated that all Ti-Mo alloys studied and pure Ti undergo spontaneous passivation due to spontaneously formed oxide film passivating the metallic surface, in the chloride-containing solution. It also indicated that the addition of Mo to pure Ti up to 15 wt.% seems to improve the protection characteristics of its spontaneous oxides. Electrochemical impedance spectroscopy (EIS) studies showed high impedance values for all samples, increasing with immersion time, indicating an improvement in corrosion resistance of the spontaneous oxide film. The fit obtained suggests a single passive film present on the metals' surface, improving their resistance with immersion time, presenting the highest values to Ti-15Mo alloy. Potentiodynamic polarization showed a typical valve-metal behavior, with anodic formation of barrier-type oxide films, without pitting corrosion, even in chloride-containing solution. In all cases, the passive current values were quite small, and decrease after 360 h of immersion. All these electrochemical results suggest that the Ti-15Mo alloy is a promising material for orthopedic devices, since electrochemical stability is directly associated with biocompatibility and is a necessary condition for applying a material as biomaterial. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.