中文摘要：

采用动电位极化法和交流阻抗法研究了X80钢焊接接头在抚顺地区土壤溶液、雨水和雪水中的腐蚀行为，利用光学显微镜观察了腐蚀形貌。结果表明：X80钢焊接接头母材和焊缝试样在3种腐蚀溶液中的极化曲线均表现出典型的活化溶解特性，在土壤溶液、雨水和雪水中的极化电阻和弥散指数均依次升高，即腐蚀速率依次降低，表面膜致密性依次升高；X80钢焊接接头在3种腐蚀溶液中的耐腐蚀性能由好到差依次为雪水、雨水、土壤溶液，在同种腐蚀溶液中焊缝试样的耐腐蚀性能优于母材试样的。

英文摘要：

The corrosion behaviors of X80 steel welded joint in soil solution, rain water and snow water in Fusbun area were investigated by the potentiodynamic polarization and electrochemical impedance spectroscopy, and then the corrosion morphology was observed by optical microscope. The results show that the polarization curves of the base material sample and weld sample from X80 steel welded joint exhibited typical active dissolution characteristics in the three corrosive solutions. The polarization resistance and diffusion index of the samples increased in soil solution, rain water and snow water in turn, indicating the decrease of corrosion rate and the increase of surface film density in turrL The corrosion resistance of the X80 steel welded joint in the three corrosive solutions decreased in the order of snow water, rain water and soil solution. In the same corrosive solution, the corrosion resistance of the weld sample was better than that of the base material sample.