Journal
BIOMATERIALS
Volume 23, Issue 14, Pages 2917-2925Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0142-9612(01)00420-3
Keywords
titanium; surface modification; passivation; XPS; AES; biocompatibility
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This study examined the influence of chemistries and surface characteristics of Ti6A14V on the adsorption of Ca and P species and ion dissolution behavior of the material exposed in Hank's solution with 8.0mM ethylene diamine tetra-acetic acid at 37degreesC. The variation of chemistries of the alloy and nano-surface characteristics (chemistries of nano-surface oxides, amphoteric OH group adsorbed on oxides, and oxide thickness) was effected by surface modification and three passivation methods (34% nitric acid passivation, 400degreesC heated in air, and aged in 100degreesC water). X-ray photoelectron spectroscopy and Auger electron spectroscopy were used for surface analyses. The chemistries of nano-surface oxides in a range studied should not change the capability of Ca and P adsorption. Nor is the capability affected significantly by amphoteric OH group and oxide thickness. However, passivations influence the surface oxide thickness and the early stage ion dissolution rate of the alloy. The rate-limiting step of the rate can be best explained by metal-ion transport through the oxide film, rather than hydrolysis of the film. Variation of the chemistries of titanium alloy alters the electromotive force potential of the metal, thereby affecting the corrosion and ion dissolution rate. (C) 2002 Elsevier Science Ltd. All rights reserved.
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