通过扫描微电极法研究敏化处理奥氏体不锈钢(304ss)的局部腐蚀行为，并结合传统电化学方法及光学显微镜进行测试观察. 结果表明，在10% FeCl3溶液未敏化处理(304ss-NS)或550 oC轻度敏化处理(304ss-S1)的不锈钢倾向于发生点腐蚀，而650 oC(304ss-S2)或750 oC(304ss-S3)深度敏化处理不锈钢则倾向于发生晶间腐蚀.
Based on a home-built setup of scanning reference electrode technique, and combined with conventional electrochemical measurements, the localized corrosion behavior of sensitized 304 stainless steel (304ss) had been investigated in this work. The results showed that, the non-sensitized 304ss or 304ss sensitized at 550 oC was susceptible to pitting; while 304ss sensitized at 650 oC or 750 oC suffered severe intergranular corrosion in 10% FeCl3 solution.
[1] Arutunow A, Darowicki K, Zielinski A. Atomic force microscopy based approach to local impedance measurements of grain interiors and grain boundaries of sensitized AISI 304 stainless steel[J]. Electrochimica Acta, 2011, 56(5): 2372-2377.
[2] Pujar M G, Parvathavarthini N, Daya R K. et al. Assessment of galvanic corrosion in galvanic couples of sensitized and nonsensitized AISI type 304 stainless steel in nitric acid[J]. International Journal of Electrochemical Science, 2008, (3): 44-55.
[3] Fang X Y, Wang W G, Guo H, et al. Corrosion behaviors of random and special grain boundaries in a sensitized 304 stainless steel[J]. Journal of Iron and Steel Research International, 2007, 14(S1): 339-343.
[4] Fan G W(范光伟), Zhang S L(张寿禄), Qin H Y(秦丽雁). Electrochemical impedance spectroscopy of 304 stainless steels during intergranular corrosion[J]. Research Studies on Foundry Equipment(铸造设备研究), 2007, (3): 12-15.
[5] Isaacs H S, Vyas B F [M]// Mansfield F, Bertocci U (Editors). Electrochemical corrosion testing, American Society for Testing and Materials, ASTM STP 727, Philadelphia, 1981: 3-33.
[6] Lin C J, Lou J L, Zhou X D, et al. Scanning microelectrode studies of early pitting corrosion of 18/8 stainless steel[J]. Corrosion, 1998, 54(4): 265-270.
[7] Lin B, Hu R G, Ye C Q, et al. A study on the initiation of pitting corrosion in carbon steel in chloride-containing media using scanning electrochemical probes[J]. Electrochimica Acta, 2010, 55(22): 6542-6545.
[8] Xu H, Liu Y, Lin C J, et al. Corrosion behavior of reinforcing steel in simulated concrete pore solutions: A scanning micro-reference electrode study[J]. Electrochimica Acta, 2009, 54(16): 4067-4072.
[9] Xiao J M(肖纪美). The metallography of stainless steel (2nd Ed)[M]. Beijing: Metallurgical Industry Press(冶金工业出版社), 2006: 173-177.
[10] Qin H Y(秦丽雁), Zhang S L(张寿禄), Song S Z(宋诗哲). Sensitive temperatures for intergranular corrosion of typical stainless steels[J]. Journal of Chinese Society for Corrosion and Protection, 2006, 26(1): 1-5.
