采用室内模拟实验的方法，研究了 Q345钢在铅污染土壤中不同时间的腐蚀行为。利用SEM、XRD和电化学测试技术分别研究了Q345钢腐蚀后的形貌、腐蚀产物组成、电荷转移电阻和腐蚀电流密度变化规律。实验结果表明：在腐蚀初期发生局部腐蚀出现腐蚀坑，随时间的延长，其腐蚀形式转变为全面腐蚀加点蚀，腐蚀初期在金属表面形成一层均匀的腐蚀产物膜，对基体起到保护的作用，但随着浸泡时间延长，腐蚀产物膜增厚且有脱落的趋势。电化学测试结果表明：随着时间的延长电荷转移电阻增大，但第3周时突然降低使其保护性降低。%The lab simulation test of corrosion behavior of Q345 steel in soil contaminated by lead was investigated as time proceeds .The corrosion morphology ,corrosion products ,charge-transfer resistance and electric current density of Q345 steel were studied by SEM , XRD and electrochemical measurement technology . The experimental results showed that local corrosion and corrosion pits occur at the initial stage ,and then with the increase of immersion time ,the corrosion forms turn to general corrosion and pitting corrosion .At the initial stage ,it could form homogeneous corrosion product film in the sample surface ,which had protection effect for matrix ,but with the immersion time increases ,the corrosion film thicken and fall off . The electrochemical measurement technology research showed that the charge-transfer resistance increased with the time ,but decreased suddenly three weeks later and the protective capability of film got weak .
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