中文摘要：

采用动电位极化、金相显微镜及电化学阻抗谱等方法研究了X80钢在不同温度（25℃，45℃和65℃）的高pH土壤模拟溶液（0．5tool·L^-Na2CO3＋1．0mol·L^-1NaHCO3）中的腐蚀电化学行为。动电位极化及金相显微镜结果表明，随着温度的升高，X80钢腐蚀速率增加，钝化膜耐蚀性降低，且65~C时最为严重；不同温度下钝化膜的电化学阻抗谱均呈现高、中频段容抗弧和低频段Warburg阻抗特征，随着温度的升高，X80钢表面钝化膜致密性逐渐变差，对基体的保护作用逐渐降低。

英文摘要：

The electrochemical behavior of X80 steel in simulated soil solutions with high pH （0. 5 mol ·L^-1 Na2CO3＋1. 0 mol·L^- 1 NaHCOa ） at different temperatures （25 ℃, 45 ℃ and 65℃） was investigated by potentiodynamic polarization, metallurgical microscopy and eleetrochemiscal impedance spectroscopy （EIS）. The results of potentiodynamic polarization and metallurgical microscopy showed that the corrosion resistance of the steel and its passive films were weakened gradually as the temperature increasesd, and the worst condition was at 65 ℃. All electrochemical impedance spectroscopy（EIS） of passive films at different temperatures showed the characters of double capacitive arcs and Warburg impedance. As the temperature increased, the compactness of passive films on XS0 steel surface became worse and thus the protection of passive film for XS0 was weakened gradually.