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对N80钢在不同CO2压力下进行高温、高压腐蚀实验,根据失重法计算N80钢的腐蚀速率,利用扫描电镜观察腐蚀产物膜的微观形态,分析腐蚀产物膜的厚度和Ca元素含量,利用电化学阻抗谱和极化曲线法测试了腐蚀产物膜的电化学性能,并对腐蚀产物膜与基体间的剪切强度进行了测试.结果表明,随CO2压力增加,N80钢腐蚀速率增大;腐蚀产物膜晶粒尺寸基本不变,膜中微观缺陷数量逐渐增多;腐蚀产物膜电阻和反应电阻呈逐渐增加的趋势;腐蚀产物膜与N80钢基体结合的剪切强度下降,促进了N80钢的腐蚀.
The corrosion rate of N80 steel was calculated by weight loss method. The microstructure of the corrosion product film was observed by scanning electron microscopy. The thickness of the corrosion product film and the content of Ca element were analyzed. Electrochemical The electrochemical properties of the corrosion product film were tested by impedance spectroscopy and polarization curve method, and the shear strength between the corrosion product film and the matrix was tested. The results showed that the corrosion rate of N80 steel increased with the increase of CO2 pressure. The size of the film is basically unchanged, the number of micro-defects in the film gradually increases; the film resistance and the reaction resistance of the corrosion product are gradually increasing; the shear strength of the corrosion product film combined with the N80 steel substrate is decreased, which promotes the corrosion of the N80 steel.