Electrochemical characterisation of passive films on Ti alloys under simulated biological conditions

被引:173
作者
Hodgson, AWE [1 ]
Mueller, Y
Forster, D
Virtanen, S
机构
[1] Swiss Fed Inst Technol, Inst Mat Chem & Corros, CH-8093 Zurich, Switzerland
[2] Swiss Fed Inst Technol, Dept Mat, CH-8093 Zurich, Switzerland
关键词
titanium; titanium alloys; passive film; simulated body fluid; calcium phosphate;
D O I
10.1016/S0013-4686(02)00029-4
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
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.
引用
收藏
页码:1913 / 1923
页数:11
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