采用动电位极化和交流阻抗技术研究了四种常用管线钢(Q235钢、20钢、X70钢和X80钢)在满洲里土壤模拟溶液中的腐蚀行为，并观察了它们的腐蚀形貌。结果表明：四种管线钢的极化曲线均呈典型的活化溶解特征；Q235钢、20钢、X70钢和 X80钢的电极极化电阻和弥散指数均依次增大，氧化膜完整性和致密性依次增强，腐蚀速率依次减小；Q235钢发生了显著的全面腐蚀，腐蚀最严重；20钢同时发生全面腐蚀和局部腐蚀，腐蚀程度较 Q235钢轻；X70钢和 X80钢均以点蚀为主，前者腐蚀轻微，后者的腐蚀现象不明显。
Corrosion behavior of four commonly used pipeline steels (Q235 steel,20 steel,X70 steel and X80 steel)in simulated Manzhouli soil solution were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS ), and their corrosion morphology were observed.The results show that, the polarization curves of four pipeline steels all presented typical active dissolution characteristics in simulated Manzhouli soil solution.From Q235 steel,20 steel,X70 steel to X80 steel,the electrode polarization resistance and diffusion index increased in turn,oxide film′s integrity and compactness enhanced in turn,and corrosion rate presented decreasing trend in turn.Q235 steel exhibited serious general corrosion,and it′s corrosion degree was the heaviest in the four kinds of steels.For 20 steel,general corrosion and local corrosion coexisted,and it′s corrosion degree was the lower than Q235 steel.X70 and X80 steels all mainly exhibited pitting corrosion,the corrosion degree of X70 steel was slight,while X80 steel′s corrosion was not obvious.
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