Electrochemical characterisation of passive films on Ti alloys under simulated biological conditions
Electrochemical characterisation of passive films on Ti alloys under simulated biological conditions
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DOI：
10.1016/s0013-4686(02)00029-4
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发表时间：
2002-05-07
影响因子：
6.6
通讯作者：
Virtanen, S
中科院分区：
文献类型：
--
作者：
Hodgson, AWE;Mueller, Y;Virtanen, S
描述了在模拟生物条件下Ti及其合金Ti6 Al 4V和Ti6 Al 7 Nb上钝化膜的电化学特性。采用电化学阻抗谱和光电化学作为原位技术来监测暴露于模拟体液环境时钝化膜的演变。特别感兴趣的是，暴露后立即与氧化膜的模拟体液中存在的磷酸盐和钙离子的选择性相互作用。这些离子对二氧化钛-电解质界面的影响在37摄氏度下暴露的第一个小时内就可以检测到，并且被发现是模拟体液中存在的与二氧化钛表面相互作用的唯一离子。光电流谱表明，钝化膜的半导体性能没有变化。但是所产生的光电流强度的大的变化表明在表面上存在吸附的离子。还观察到所研究的三种金属之间的不同行为。(C)2002爱思唯尔科技有限公司版权所有。
An electrochemical characterisation of the passive film on Ti, and its alloys Ti6Al4V and Ti6Al7Nb under simulated biological conditions is described. Electrochemical impedance spectroscopy and photoelectrochemistry were employed as in-situ techniques to monitor the evolution of the passive film on exposure to simulated body fluid environments. Of particular interest were the selective interactions of phosphate and calcium ions present in simulated body fluid with the oxide films, immediately after exposure. The effects of these ions on the TiO2-electrolyte interface could be detected already within the first hour of exposure at 37 degreesC and were found to be the only ions present in simulated body fluid to interact with the titanium oxide surface. Photocurrent spectra showed no change in the semi-conductive properties of the passive Films on Ti and the two alloys. but large variations on the intensity of the generated photocurrent indicated the presence of adsorbed ions on the surface. Different behaviour between the three metals investigated was also observed. (C) 2002 Elsevier Science Ltd. All rights reserved.