Interactive effects of albumin and phosphate ions on the corrosion of CoCrMo implant alloy

被引：135
作者：
Munoz, A. Igual [1 ]
Mischler, S.
机构：
[1] Univ Politecn Valencia, Dept Ingn Quim & Nucl, ETSI Ind, E-46071 Valencia, Spain
[2] Ecole Polytech Fed Lausanne, Inst Mat, CH-1015 Lausanne, Switzerland
来源：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2007年 / 154卷 / 10期
关键词：
BOVINE SERUM-ALBUMIN; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; CR-MO ALLOY; PASSIVE FILM; BIOLOGICAL ENVIRONMENTS; ADSORPTION BEHAVIOR; CHROMIUM; TITANIUM; IRON; MOLYBDENUM;
D O I：
10.1149/1.2764238
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The corrosion behavior of CoCrMo alloy in simulated body fluids has been analyzed by electrochemical techniques and surface analysis. Interaction of albumin and phosphates present in the body fluids on the passive film of the alloy was also investigated. Electrochemical techniques such as potentiodynamic and potentiostatic polarization and electrochemical impedance spectroscopy were employed. Further, ex situ X-ray photoelectron spectroscopy and Auger electron spectroscopy analysis of the passive films were carried out. The study reveals that phosphates and proteins present in simulated body fluid play a significant role in the electrochemical properties of the metal/oxide/electrolyte interface. Surface analysis showed that both species competitively adsorb on the alloy surface. For a given passive potential, the impedance behavior of passive CoCrMo was found to depend on the way passive conditions were established. A simple model has been developed assuming a multilayer structure of the surface including an outer layer where albumin and phosphate ions adsorb, the passive film (inner layer), and the metal. This model is consistent with the obtained electrochemical and surface analysis results. (c) 2007 The Electrochemical Society.
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收藏
页码：C562 / C570
页数：9
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