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在研究奥氏体不锈钢的空泡腐蚀规律和SEM形貌的基础上,采用原子力显微镜(AFM)观察奥氏体不锈钢空泡腐蚀过程中的形貌变化,并利用电化学极化技术进一步验证.结果表明:AFM腐蚀形貌并非呈塑性断口特征,而是晶界优先腐蚀、晶粒凸显且受到明显磨损与腐蚀的形态.电化学极化研究进一步验证在空化作用下不锈钢表面的钝化膜由局部被冲蚀逐渐转变为全部被冲蚀,且空化作用主要促进电极的阳极溶解过程,而对阴极过程影响不显著.
On the basis of studying cavitation corrosion and SEM morphology of austenitic stainless steel, AFM was used to observe the morphological changes during the cavitation corrosion of austenitic stainless steel. The electrochemical polarization was used to further verify the results. The results show that the corrosion morphology of AFM is not a plastic fracture, but the grain boundary preferentially corrodes and the grains are obviously worn out and corroded. Electrochemical polarization study further verifies the passivation film of stainless steel on cavitation From the local erosion gradually transformed into the full erosion, and the role of cavitation to promote the anode anodic dissolution process, while the cathode process is not significant.