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Corrosion behaviour of Ti_(40)Cu_(60) alloy in H_3PO_4 solutions

机译：Ti_（40）Cu_（60）合金在H_3PO_4溶液中的腐蚀行为

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摘要

The electrochemical behaviour of Ti_(40)Cu_(60) alloy has been investigated in aerated H_3PO_4 (0.5-4.5 M), at 37 ℃ by means of electrochemical impedance spectroscopy, potentiodynamic polarization, galvanostatic polarization and Mott-Schottky techniques. The passivation of the sample has been discussed in term of time constant RC, in particular. The highest value of time constant (355.3 ms) has been obtained after potentiodynamic polarization in 1 M H_3PO_4; at this same concentration, passivation and corrosion currents are the weakest. On the other hand, in 0.5 M the time constant has the weakest value (251.2 ms); this result is in good agreement with chronopotentiometry curve which indicates a weak dissolution of the passive film at the beginning of the galvanostatic polarization and with potentiodynamic polarization which reveals the highest passivation plateau at this concentration. The Mott-Schottky technique performed in 1 M H_3PO_4 and 10 Hz shows that the passive film has a semi-conductor character of n-type.
机译：通过电化学阻抗谱，恒电位极化，恒电流极化和Mott-Schottky技术，在37℃充气H_3PO_4（0.5-4.5 M）中研究了Ti_（40）Cu_（60）合金的电化学行为。尤其是根据时间常数RC讨论了样品的钝化。在1 M H_3PO_4中进行电势极化后，获得了最大的时间常数（355.3 ms）；在相同的浓度下，钝化和腐蚀电流最弱。另一方面，在0.5 M中，时间常数具有最弱的值（251.2 ms）；该结果与计时电位曲线很好地吻合，计时电位曲线表明在恒电流极化开始时钝化膜的溶解较弱，而电位动力学极化则在该浓度下显示出最高的钝化平台。在1 M H_3PO_4和10 Hz下执行的Mott-Schottky技术表明，无源薄膜具有n型半导体特性。

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  • 来源
    《Materials Chemistry and Physics.》 |2009年第3期|572-577|共6页
  • 作者

    H. Bouchemel; A. Benchettara;

  • 作者单位

    Laboratory of Electrochemistry-Corrosion, Metallurgy and Inorganic Chemistry, Faculty of Chemistry- USTHB-BP 32, El Alia-Bab Ezzouar, Algiers 16079, Algeria;

    Laboratory of Electrochemistry-Corrosion, Metallurgy and Inorganic Chemistry, Faculty of Chemistry- USTHB-BP 32, El Alia-Bab Ezzouar, Algiers 16079, Algeria;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ti_(40)Cu_(60) alloy; fusion; EIS; corrosion;

    机译：Ti_（40）Cu_（60）合金;融合EIS;腐蚀;

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