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首页> 外文会议>Corrosion posters (general) - 222nd ECS meeting/PRiME 2012 >Electrochemical Behavior of Ti-6Al-7Nb in Simulated Physiological Body Fluid Environment
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Electrochemical Behavior of Ti-6Al-7Nb in Simulated Physiological Body Fluid Environment

机译：Ti-6Al-7Nb在模拟体液环境中的电化学行为

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摘要

The electrochemical behavior of Ti-6Al-7Nb was investigated, and compared with that of Ti-6Al-4V alloy, which is commonly used as implant material, particularly for dentistry, orthopaedic and osteosynthesis applications. The aim of present study was to evaluate their corrosion resistance in an artificial physiological conditions using Hanks solution at 37℃. This evaluation was carried out through the analysis of the potentiodynamic polarization (PD), and electrochemical impedance spectroscopy (EIS) tests. Very low current densities were obtained from the PD curves, indicating a typical passive behavior for two investigated alloys. The EIS results at open circuit potential and at different potential exhibited capacitive behavior (high corrosion resistance) with phase angles close to -90° and high impedance values at low and medium frequencies, which are indicative of the formation of a highly stable film on these alloys in the test solution. The resistance of TAN is slightly higher than that of TAV. This difference can be attributed to the alloying elements. For TAN, the formation of Nb_2O_5 oxide, which is chemically more stable and less soluble compared to V_2O_5 formed on the Ti-6Al-4V alloy, enhances resistance to dissolution of the surface film. Thus, it has been suggested that Ti-6Al-7Nb can be a better alternative to Ti-6Al-4V in simulated body fluid environment.
机译：研究了Ti-6Al-7Nb的电化学行为，并将其与通常用作植入物材料的Ti-6Al-4V合金进行了比较，特别是在牙科，骨科和骨合成应用中。本研究的目的是在37℃下使用Hanks溶液在人工生理条件下评估其耐腐蚀性。该评估是通过对电位动力学极化（PD）的分析和电化学阻抗谱（EIS）测试进行的。从PD曲线获得了非常低的电流密度，表明两种研究合金的典型被动行为。 EIS结果在开路电势下和在不同电势下表现出电容行为（高耐腐蚀性），相角接近-90°，在中低频时具有高阻抗值，这表明在这些条件下形成了高度稳定的膜测试溶液中的合金。 TAN的电阻略高于TAV。这种差异可以归因于合金元素。对于TAN，与在Ti-6Al-4V合金上形成的V_2O_5相比，化学上更稳定且易溶的Nb_2O_5氧化物的形成增强了对表面膜溶解的抵抗力。因此，已经提出在模拟的体液环境中，Ti-6Al-7Nb可以更好地替代Ti-6Al-4V。

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  • 会议地点 Honolulu HI(US)
  • 作者

    N. A. Al-Mobarak; A. A. Al-Swayih; F. A. Al-Rashoud;

  • 作者单位

    Department of Chemistry, College of Science, Princess Nora Bint Abdul Rahman University Pox:22559 Riyadh 11416 Kingdom of Saudi Arabia;

    Department of Chemistry, College of Science, Princess Nora Bint Abdul Rahman University Pox:22559 Riyadh 11416 Kingdom of Saudi Arabia;

    Department of Chemistry, College of Science, Princess Nora Bint Abdul Rahman University Pox:22559 Riyadh 11416 Kingdom of Saudi Arabia;

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