【摘要】 本文采用AFS和FPMA以及旋转圆盘—圆环电极等方法,对三种Fe-Cr合金在3.5％NaCl溶液中的钝化和点蚀行为进行了研究,考察了铬的作用和溶解机理,并据此提出了两种点蚀发展模型。更多还原

【Abstract】 The passivity and pitting mechanisms of Fe-Cr alloys which contain 13%Cr, 17%Cr and 28%Cr in 3.5%NaCl solution have been presented by AES, EPMA technique and rotating disc-ring electrochemical measurement, especially, the behaviour of element Cr was investigated. By experiments and analysis, the following conclusions have been obtained: (a) The most important factor that control corrosion resistance of Fe-Cr alloys is the ratio Cr/Fe in passive film. (b) For diffenent Fe-Cr alloys, dissolution of Cr within pit is different. For alloys of Fe-13Cr and Fe-17Cr, dissolution of Cr follow dissolution-deposition reaction but following adsorption-desorption reaction is occurred for Fe-28Cr alloy.(c) Based on the experimental results and analytical discussion,models of pitting propagation mechanism for Fe-13Cr, Fe-17Cr alloys and for Fe-28Cr alloy have bene proposed respectively.更多还原