• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Electrochemistry of CoCrMo Implant in Hanks' Solution and Mott-Schottky Probe of Alloy's Passive Films
【24h】

Electrochemistry of CoCrMo Implant in Hanks' Solution and Mott-Schottky Probe of Alloy's Passive Films

机译：Electrochemistry of CoCrMo Implant in Hanks' Solution and Mott-Schottky Probe of Alloy's Passive Films

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相关主题

摘要

CoCrMo alloy has become one of the most important load-bearing materials in orthopedics. The influence of alloying components on the alloy's electrochemical behavior (passivity, pitting corrosion, and transpassivity) has been investigated in situ under in vitro conditions in Hanks' solution. It was shown that anodic oxidation provides specific alloy's surface functionalization that imparts high corrosion resistance to the alloy, thus determining material's biocompatibility and implantation applicability. The deep understanding of the electronic (semiconducting) properties of passive films anodically formed on CoCrMo alloy is needed to predict long-term corrosion resistance of implant materials in simulated body fluids. Mott-Schottky tests were used to probe electronic properties of the passive films formed on the alloy and pure chromium (as a result of the "chromium-like" alloys passivity). Both films were found to behave as p-type semiconductors, exhibiting the same flat-band potential, E-FB, and the acceptor density values, N-A, corrected for the frequency dispersion. One order of magnitude lower N-A for the alloy, which corresponds to the point defects and/or film's nonstoichiometry, was explained by interaction of cation vacancies, V-Cr(3-), with highly charged Mo-ions, segregated in the film during alloy's anodic polarization. This complexation led to an increase in electronic conductivity of the surface film and in turn to an increased alloy's resistance against general and pitting corrosion. It is important to point out that the semiconducting parameter E-FB determines the accurate value of the transpassivity onset potential. At potentials E E-FB, the surface film enters an accumulation mode and undergoes transpassive dissolution.

著录项

获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号