The effects of extreme stray current on the anodic dissolution and passivation of X80 steel in NaHCO₃ solution were investigated using measurements of polarization curves and EIS, AFM and SEM techniques. Under the interference of anodic current (i = 0~200 A/m²), main constituents of corrosion products of X80 steel were FeO(OH) and Fe₃O₄. A double-layer film formed at i = 100 A/m², in which FeOOH was in outer and Fe₃O₄ lied in inner. The formation mechanism of Fe₃O₄ was confirmed and described by the electrochemical reaction in various regions on anodic potentiodynamic polarization curve.

中文翻译：

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阳极溶解和钝化对NaHCO 3溶液中X80钢的影响

利用极化曲线的测量以及EIS，AFM和SEM技术研究了极端杂散电流对X80钢在NaHCO ₃溶液中阳极溶解和钝化的影响。在阳极电流（i  = 0〜200 A / m ²）的干扰下，X80钢腐蚀产物的主要成分为FeO（OH）和Fe ₃ O ₄。以i ＝ 100A / m ²形成的双层膜，其中FeOOH在外部，Fe ₃ O ₄在内部。Fe ₃ O ₄的形成机理 通过阳极电位动力学极化曲线上各个区域的电化学反应得到证实和描述。