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针对超级马氏体不锈钢Super-Cr13,研究其在150℃、CO2分压为1 MPa且有不同Cl-含量的模拟工况环境下的腐蚀行为,并与传统2Cr13马氏体不锈钢进行对比。采用腐蚀质量损失以及SEM观察等方法,对不锈钢的腐蚀程度、表面形貌和微观组织进行分析;比较高温高压腐蚀后钝化膜的结构特点,并分析讨论CO2和Cl-腐蚀的交互作用。结果表明:Super-Cr13表面能够形成保护性很强的钝化膜,可有效减缓均匀腐蚀和阻止点蚀的形成。
In the super martensitic stainless steel Super-Cr13, the corrosion behavior of the super martensite stainless steel Super-Cr13 under simulated working conditions of 150 ℃, partial pressure of CO2 of 1 MPa and different content of Cl- was studied and compared with that of traditional 2Cr13 martensitic stainless steel. The corrosion degree, surface morphology and microstructure of stainless steel were analyzed by means of corrosion mass loss and SEM observation. The structural characteristics of passivation film after high temperature and high pressure corrosion were compared and the interaction between CO2 and Cl-corrosion was analyzed. The results show that the super-Cr13 surface can form a protective film with a strong protective effect, which can effectively reduce the uniform corrosion and prevent the formation of pitting corrosion.