论文部分内容阅读
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。
Atomic force microscopy and conventional electrochemical testing techniques were used to study the early corrosion of 35CrMo steel in saturated CO2 solution from the nanoscopic level. The results show that the corrosion potential of 35CrMo steel is -503 mV in simulated oil-water saturated CO2 solution, which belongs to the corrosive process of activation polarization control. The initial surface structure of 35CrMo steel is undulating. When 35CrMo steel is anodically polarized in solution, The undulation of the protruding part of the intergranular composition caused by the dissolution of the first priority, resulting in reduced height and reduce the height of the border, so that the surface of 35CrMo steel gradually acicular, corrosion from local corrosion into full corrosion.