中文摘要：

在模拟油田CO2腐蚀环境下,利用失重法、极化曲线及交流阻抗技术研究了X65钢在不同腐蚀时间和不同温度下形成的腐蚀产物膜特征。结果表明,腐蚀产物膜的生成可以显著降低腐蚀电流密度;从65℃,75℃到90℃时,随着温度的升高,腐蚀速率逐渐下降;从90℃到115℃时,腐蚀速率又开始上升。不同腐蚀时间电化学阻抗谱（EIS）曲线主要有高频容抗弧、低频感抗弧和低频容抗弧,其中低频感抗弧与试样表面活化溶解有关,低频容抗弧与试样表面腐蚀产物膜的生成有关。随着温度的升高,腐蚀产物膜的交流阻抗谱形状发生了变化。

英文摘要：

The CO2 corrosion is widely found in oil and gas industries, and has been a research topic for a long time. In the CO2 eorrosion proeess, the eorrosion product seale will be formed on the steel surfaee, providing protection for the steel or ehanging its morphology and meehanieal properties. The formation and growth of COz eorrosion product seale are affeeted by several faetors, sueh as temperature, CO2 partial pressure, pH value and flow rate of the solution and others. In this paper, the formation and growth of CO2 eorrosion produet scale on X65 steel at a flow condition are studied using EIS teehniques. Results show that the eorrosion produet seale eould observably reduce the corrosion rate, whieh decreases with increasing temperature from 65℃,75℃ to 90℃ while increases from 90℃ to 115℃. Electrochemical Impedance Spectroscopy （EIS） curve includes capacitive loop in high- frequency, and both inductive and capacitive loops in low-frequency. The inductive loop in low-frequency is due to activation dissolution of the specimen surface, while the capacitive loop in low-frequency is related with corrosion product scale formation on the specimen surface. EIS of CO2 corrosion product scales change with increasing temperature.