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Erosion-corrosion of aluminium alloys in ethylene glycol-water solutions in absence and presence of sand particles

机译：在不存在和存在沙粒的情况下，铝合金在乙二醇-水溶液中的腐蚀腐蚀

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摘要

The erosion-corrosion of aluminium alloys in ethylene glycol-water solutions that simulated the automotive coolant was studied by a rotating cylinder electrode (RCE) through the measurements of potentiodynamic polarisation curves, electrochemical impedance spectroscopy and weight loss. In the absence of sand particles, the turbulent flow developed on RCE produces weakening effects and damage to the oxide film on the Al electrode, which becomes more active with the increasing fluid flow, as indicated by the negative shift of corrosion potential and the decreasing film resistance. In the presence of sand particles, both the turbulent flow of solution and the mechanical impingement of sand particles contribute to the weakening and damage to the oxide film. However, the interfacial reaction mechanism is not changed upon the sand addition. In the ethylene glycol-water-sand solution, weight loss of Al alloys is mainly due to the contribution of the mechanical erosion of sand particles. The corrosion induced weight loss is negligible.
机译：通过旋转圆柱电极（RCE），通过测量电位动力学极化曲线，电化学阻抗谱和重量损失，研究了铝合金在乙二醇-水溶液中的腐蚀腐蚀，以模拟汽车冷却液。在没有沙粒的情况下，RCE上产生的湍流会减弱作用并损坏Al电极上的氧化膜，随着流体流量的增加，Al电极上的氧化膜变得更加活跃，这表现为腐蚀电位的负移和膜层的减少抵抗性。在存在沙粒的情况下，溶液的湍流和沙粒的机械撞击都有助于削弱和损坏氧化膜。但是，添加砂子后界面反应机理不会改变。在乙二醇-水-沙溶液中，铝合金的重量损失主要归因于沙粒的机械侵蚀。腐蚀引起的重量损失可以忽略不计。

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  • 来源
    《Corrosion Engineering, Science and Technology》 |2009年第5期|389-393|共5页
  • 作者

    Niu L.; Cheng Y.F.;

  • 作者单位

    Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada;

    Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta, T2N 1N4, Canada, Email: fcheng@ucalgary.ca;

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