文献类型：期刊文献

英文题名：Electrochemical and surface analyses of nanostructured Ti-24Nb-4Zr-8Sn alloys in simulated body solution

作者：Li, J.[1];Li, S. J.[1];Hao, Y. L.[1];Huang, H. H.[2];Bai, Y.[1];Hao, Y. Q.[3];Guo, Z.[4];Xue, J. Q.[5];Yang, R.[1]

机构：[1]Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China;[2]Natl Yang Ming Univ, Dept Dent, Taipei 112, Taiwan;[3]China Med Univ, Sch Stomatol, Dept Prosthodont, Shenyang 110002, Peoples R China;[4]Fourth Mil Med Univ, Dept Orthopaed, Xijing Hosp, Xian 710032, Peoples R China;[5]E China Univ Sci & Technol, Dept Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：10

期号：6

起止页码：2866

外文期刊名：ACTA BIOMATERIALIA

收录：;EI(收录号：20215111347564);WOS:【SCI-EXPANDED(收录号:WOS:000336345900050)】；

基金：This study was partially supported by the National Basic Research Program of China (2012CB619103, 2012CB933901 and 2012CB933902) and the National Natural Science Foundation of China (51271180, 51271182 and 51071152).

语种：英文

外文关键词：Titanium alloys; Corrosion behavior; Nanostructure; Passive film

摘要：The use of nanostructuring to improve the stability of passive thin films on biomaterials can enhance their effectiveness in corrosion resistance and reduce the release of ions. The thickness of the ultrathin films that cover Ti and Ti alloys (only several nanometers) has prevented researchers from establishing systematic methods for their characterization. This study employed a multifunctional biomedical titanium alloy Ti-24Nb-4Zr-8Sn (wt.%) as a model material. Coarse-grained (CG) and nanostructured (NS) alloys were analyzed in 0.9% NaCl solution at 37 degrees C. To reveal the details of the passive film, a method of sample preparation producing a passive layer suitable for transmission electron microscope analysis was developed. Electrochemical corrosion behavior was evaluated by potentiodynamic polarization tests and Mott-Schottky measurements. Surface depth chemical profile and morphology evolution were performed by X-ray photoelectron spectroscopy and in situ atomic force microscopy, respectively. A mechanism was proposed on the basis of the point defect model to compare the corrosion resistance of the passive film on NS and CG alloys. Results showed that the protective amorphous film on NS alloy is thicker, denser and more homogeneous with fewer defects than that on CG alloy. The film on NS alloy contains more oxygen and corrosion-resistant elements (Ti and Nb), as well as their suboxides, compared with the film on CG alloy. These characteristics can be attributed to the rapid, uniform growth of the passive film facilitated by nanostructuring. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.