Abstract The role of inclusions in the initiation of corrosion pits for a high strength pipeline steel in NaCl solution was investigated. The inclusions with typical compositions of Al-Mg-Ca-S-O were found typically spherical and responsible for the initiation of circular corrosion pits. The possible formation mechanism of the spherical inclusions and their role in the initiation of pitting corrosion are discussed. The electron irradiation in scanning electron microscopy, including the morphology observation and energy-dispersive X-ray spectroscopy test, was found to have significant influence on the pitting susceptibility around the inclusions.

中文翻译：

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夹杂物在管线钢点蚀引发中的作用及扫描电镜电子辐照的影响

摘要 研究了夹杂物在高强度管线钢在NaCl溶液中形成腐蚀坑的作用。发现具有典型组成的 Al-Mg-Ca-SO 的夹杂物通常呈球形，并负责形成圆形腐蚀坑。讨论了球形夹杂物的可能形成机制及其在引发点蚀中的作用。发现扫描电子显微镜中的电子辐照，包括形貌观察和能量色散X射线光谱测试，对夹杂物周围的点蚀敏感性有显着影响。