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首页> 外文期刊>British Corrosion Journal >Corrosion behaviour fo Al–Si/SiC composite in sea water
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Corrosion behaviour fo Al–Si/SiC composite in sea water

机译：Al-Si / SiC复合材料在海水中的腐蚀行为

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摘要

A study was made of the corrosion behaviour in sea water of a metal matrix composite (MMC) of Al–Si alloy reinforced with SiC particles. Free corrosion and electrochemical tests were carried out at 25°C in quiescent sea water at pH 8·2 containing 6·5 ppm dissolved oxygen. The microstructure was examined by metallographic microscopy and by X-ray microdiffractometry; electrochemical properties (pitting resistance, polarisation resistance) were investigated by potentiodynamic polarisation and electrochemical impedance spec troscopy; pitting formation was observed by optical microscopy; and the corrosion layer was characterised by X-ray photoelectron spectroscopy. In sea water the MMC suffered localised corrosion of the metallic matrix where Al–Cu intermetallic compounds are present. Pit formation was enhanced by copper enrichment in the surface layer. The MMC showed a small passivity domain which increased slowly with immersion time. No domain of perfect passivity was present. The SiC particles acted as cathodic sites with respect to the metallic matrix, which experienced selective aluminium dissolution.
机译：对SiC颗粒增强的Al-Si合金的金属基复合材料（MMC）在海水中的腐蚀行为进行了研究。在25°C的静态海水中，pH为8·2的水中含有6·5 ppm的溶解氧，进行了自由腐蚀和电化学测试。通过金相显微镜和X射线微衍射法检查其微观结构。通过电位动力学极化和电化学阻抗谱研究了电化学性能（耐点蚀性，极化电阻）。用光学显微镜观察点蚀的形成。用X射线光电子能谱对腐蚀层进行表征。在海水中，MMC遭受了存在Al-Cu金属间化合物的金属基质的局部腐蚀。通过表面层中铜的富集增强了坑的形成。 MMC显示出一个小的钝化域，该钝化域随浸入时间而缓慢增加。没有完美被动性的领域存在。相对于金属基质，SiC颗粒充当了阴极位置，经历了选择性的铝溶解。

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  • 来源
    《British Corrosion Journal》 |1999年第1期|57-62|共6页
  • 作者

    Gnecco F.; Beccaria A.M.;

  • 作者单位

    The Istituto per la Corrosione Marina dei Metalli, MITER-CNR, Via De Marini 6 16149, Genoa, Italy;

    The Istituto per la Corrosione Marina dei Metalli, MITER-CNR, Via De Marini 6 16149, Genoa, Italy;

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