用极化曲线和交流阻抗等电化学方法研究了B510L热轧钢板表面氧化膜对基体钢板腐蚀行为的影响。结果表明：热轧钢板的阳极与阴极过程主要通过氧化膜自身缺陷在基体表面进行，氧化膜本身主要对基体金属起到物理屏蔽作用，并不影响膜下金属腐蚀反应的过程和机制。研究中发现腐蚀电流与氧化膜中存在的缺陷数量成正比，因此，氧化膜的孔隙率可以用有膜和无膜金属腐蚀电流比值表达。计算结果表明，测定氧化膜覆盖金属的腐蚀电流和极化电阻可以合理评价热轧钢板表面氧化膜的孔隙率。
Effect of oxide film on the corrosion behaviors of the steel of B510L hot rolled strip was investigated by potentiodynamic polarization curves and electrochemical impedance spectroscope(EIS). The results indicated that the oxide film had no effect on the mechanism of the anodic reaction, cathodic reaction and the corrosion of carbon steel. The poor protection of the oxide film with defects led to the corrosion of the metal. Porosity of the oxide film could be calculated from the analysis of potentiodynamic polarization curves and electrochemical impedance spectroscope(EIS).
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