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Mechanism of (Mg,Al,Ca)-oxide inclusion-induced pitting corrosion in 316L stainless steel exposed to sulphur environments containing chloride ion

机译:暴露于含氯离子硫环境中的316L不锈钢中(Mg,Al,Ca)-氧化物夹杂物引起的点蚀的机理

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摘要

The mechanism of oxide inclusion-induced pitting corrosion in 316L stainless steel exposed to sulphur environments containing chloride ions was investigated by scanning electron microscope analysis, electrochemical measurements and scanning Kelvin probe force microscopy (SKPFM). Two inclusion types were observed. The (Mg,Al,Ca)-oxide inclusions play an important role in pitting formation. SKPFM measurement results show that the inclusion sites exhibited a lower surface potential than the matrix. Finally, the schematic representation of the initiation and propagation process of the (Mg,Al,Ca)-oxide inclusion-induced pitting corrosion in 316L stainless steel exposed to sulphur environments containing chloride ions was established.
机译:通过扫描电子显微镜分析,电化学测量和扫描开尔文探针力显微镜(SKPFM),研究了316L不锈钢在含氯离子的硫环境中氧化物夹杂物引起的点蚀的机理。观察到两种夹杂物类型。 (Mg,Al,Ca)-氧化物夹杂物在点蚀形成中起重要作用。 SKPFM测量结果表明,包含位点的表面电势低于基质。最后,建立了在暴露于含氯离子硫环境中的316L不锈钢中(Mg,Al,Ca)-氧化物夹杂物引起的点蚀的引发和传播过程的示意图。

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  • 来源
    《Corrosion science》 |2013年第2期|20-31|共12页
  • 作者单位

    Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China;

    Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China;

    School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;

    Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China;

    Department of Materials Science and Engineering, China University of Petroleum, Beijing 102249, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A. Stainless steel; B. AFM; C. Pitting corrosion; C. Inclusions; C. Acid corrosion;

    机译:A.不锈钢;B.原子力显微镜;C.点蚀;C.夹杂物;C.酸腐蚀;

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