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用内转换电子穆斯堡尔谱(CEMS)、俄歇电子能谱(AES)和X-光电子能谱(XPS)研究比较了316和321两种奥氏体不锈钢在含Cl~-2000ppm,含O_28～9ppm高温水中应力腐蚀开裂前后的氧化膜结构及其元素分布,发现合金氧化膜层组成和结构与其抗应力腐蚀性间有一定的对应关系。合金元素Mo在一定条件下与介质作用形成Fe_2(MoO_4)_3相。Mo能控制铁的氧化物相,降低Cr的过钝化溶解速率以及抑制Cl-向膜穿透,起着延长应力腐蚀孕育期的作用。所得结果为阐明含Mo的316钢较不含Mo的321钢有较高的抗应力腐蚀性、以及两者有不同的SCC断口形貌提洪论据。文中还根据合金热力学的作用进一步作了讨论。
The results of internal conversion electron Mossbauer spectroscopy (CEMS), Auger electron spectroscopy (AES) and X-ray photoelectron spectroscopy (XPS) were compared between 316 and 321 austenitic stainless steels containing Cl ~ 2000ppm, containing O_28 ~ 9ppm high temperature water stress corrosion cracking before and after the oxide film structure and its elemental distribution, alloy oxide film layer composition and structure and its resistance to stress corrosion between a certain correspondence. The alloying element Mo interacts with the medium to form Fe_2 (MoO_4) _3 phase under certain conditions. Mo can control the oxide phase of iron, reduce the over-passivation rate of Cr and inhibit the penetration of Cl- into the film, which plays a role in prolonging the period of stress corrosion. The results obtained demonstrate the high resistance to stress corrosion of 321 steels containing Mo compared to 321 steels containing no Mo, and the two have different TSP profiles. The article also made further discussion according to the role of alloy thermodynamics.