The corrosion behavior of X80 pipeline steel in silty soil containing chloride ions at different temperatures was investigated using different electrochemical techniques. Scanning electron microscopy and energy-dispersive spectroscopy were used to characterize the corrosion morphology and physicochemical properties of the X80 steel. The lower chloride ion concentration and the ambient temperature were associated with the lower the unfrozen water content in the soil and the easier it to form an anoxic corrosion environment. As the chloride ion concentration increased, the corrosion rate increased at − 10 °C and first increased and then decreased at − 20 °C. The steel corroded surface were present irregular elliptical uncorroded areas in a soil environment at the sub-zero temperature, which may be caused by the liquid–solid phase transition hindering the transportation of the reducing medium. The rust layers in a positive temperature soil environment were present relatively dry. This phenomenon is due to the current density is high, and the exothermic process is evident.

采用不同电化学技术研究了X80管线钢在不同温度下在含氯离子粉质土壤中的腐蚀行为。扫描电子显微镜和能量色散光谱用于表征X80钢的腐蚀形貌和理化性能。氯离子浓度越低，环境温度越低，土壤中未冻水含量越低，越容易形成缺氧腐蚀环境。随着氯离子浓度的增加，腐蚀速率在−10 °C 时增加，在−20 °C 时先增加后减小。钢腐蚀表面在低于零温度的土壤环境中呈现不规则的椭圆形未腐蚀区域，这可能是由于液固相变阻碍了还原介质的输送。正温土壤环境中的锈层相对干燥。这种现象是由于电流密度高，放热过程明显。