目前,有关X100管线钢钝化表面点蚀的研究报道较少.在0.50 mol/L NaHCO3溶液中对X100高强管线钢进行恒电位极化,在其表面形成钝化膜,借助Mott-Schottky曲线计算钝化膜的缺陷密度,采用扫描电镜和能谱仪分析了X100管线钢钝化后第二相夹杂物的物相.采用循环极化曲线及扫描电镜分析了X100管线钢在0.50 mol/L NaHCO3 +0.01 mol/L NaCl溶液中钝化表面产生点蚀的原因.结果表明:X100管线钢表面钝化膜的主要成分为Fe2O3和Fe3O4,钝化膜并不完整,氧空位缺陷和无钝化膜的第二相夹杂物同时存在;钝化膜缺陷的不均匀和第二相夹杂物处均可形成闭塞电池,导致稳态点蚀发生.
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