通过Mott-Schottky曲线和点缺陷模型(PDM),计算了不同氯离子浓度下钝化膜的缺陷密度和缺陷扩散系数,测量了X100高强管线钢在不同氯离子浓度下的循环极化曲线,并对腐蚀形貌进行了观察。结果表明:X100高强管线钢表面钝化膜并不完整,随氯离子浓度的增加,缺陷密度随之增多,击破电位和保护电位随之下降,蚀坑数量随之增多。 Through the Mott-Schottky curve and point defect model (PDM), the defect densities and defect diffusion coefficients of passivation films at different concentrations of chloride ion were calculated. The cyclic polarization curves of X100 high strength pipeline steel under different chloride ion concentrations The corrosion morphology was observed. The results show that the passivation film on the surface of X100 high strength pipeline steel is not complete. With the increase of chloride ion concentration, the defect density increases, the breaking potential and the protective potential decrease, and the number of etch pits increases.