35CrMo钢CO2腐蚀早期过程中的电化学AFM原位观察研究
Observation and Study of CO2 Corrosion for 35CrMo Steel Using In-situ AFM
鲁 亮, 李春福
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作者单位：西南石油大学 材料科学与工程学院, 四川 成都 610500
中文关键字：电化学AFM； 35CrMo钢； CO2腐蚀； 原位
英文关键字：ECAFM; 35CrMo steel; CO2 corrosion; in-situ
中文摘要：运用原子力显微镜结合传统的电化学测试技术从纳米微观的层次上对35CrMo钢在饱和CO2溶液中的早期腐蚀进行了原位研究。结果表明，35CrMo钢在模拟油田水饱和CO2溶液中的自腐蚀电位为-503 mV，属于活化极化控制的腐蚀过程；其初始表面结构为起伏状，35CrMo钢在溶液中进行阳极极化时，其起伏的突起部分由于晶间成分不同造成了优先溶解，导致起伏形高度降低，边界扩大蔓延，使35CrMo钢的表面逐渐呈针岛状，腐蚀由局部腐蚀转换成全面腐蚀。
英文摘要：The corrosion morphology of 35CrMo steel in saturated CO2 solution was studied by in-situ atomic force microscope (AFM) and electrode reactions technology from nanometer micro level. The results show that the corrosion potential of 35CrMo steel in saturated CO2 solution is -503 mV, belonging to the potential activation process. Its initial shape of surface structure is bumped. As anode polarization, it rolls prominence partly because of intergranular composition dissolves, causing priority shape highly reduced. Its boundary expansion spread the steel and its surface is gradually becoming needle island, so that local corrosion is going to convert into comprehensive corrosion.