Characterization of Corrosion Behavior of Irradiated X65 Low Carbon Steel in Aerobic and Unsaturated Gaomiaozi Bentonite

查看全文 作　　者：Canshuai [1,2]Liu;Jianqiu [1]Wang;Zhiming [1]Zhang;En-Hou [1]Han;Wei [3]Liu;Dong [3]Liang;Zhongtian [3]Yang

机构地区：[1]Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences;[2]University of Chinese Academy of Sciences;[3]China Institute for Radiation Protection

出　　处：《Acta Metallurgica Sinica(English Letters)》索引2019年第32卷第4期,共11页

基　　金：supported by Key Research Program of Frontier Sciences, Chinese Academy of Sciences (QYZDYSSWJSC012);the National Natural Science Foundation of China (No. 51771211);the National Key Research and Development Program of China (2017YFB0702100, 2016YFE0105200);Key Program of the Chinese Academy of Sciences (ZDRW-CN-2017-1) 摘　　要：2.98 kGy/h(1007 h) gamma irradiation and 90 ℃(2000 h) thermal aging were exerted to X65 grade low carbon steel buried in Gaomiaozi bentonite containing 17 wt% Beishan groundwater. The average corrosion rate of X65 low carbon steel was measured. The elemental and phase distribution on cross section was characterized by using electron probe micro-analysis, high-resolution X-ray diffraction, and micro-X-ray diffraction. The following conclusions can be made: the average aerobic corrosion rate of the carbon steel is(45.16 ± 1.53) μm/year. Taking the original surface as boundary, the corrosion scale is divided into an internal dense product layer(DPL) mainly composed of Fe_3O_4 with segregated FeCO_3 at the corrosion front and an external DPL mainly composed of Fe_3O_4 with segregated α-Fe_2O_3 and bentonite at some relics.Si, S, and Cl are concentrated at the corrosion front of the internal DPL, while Si and Al are concentrated at the external DPL. 关键词：Low carbon steel Corrosion rate Phase distribution ELEMENTAL concentration

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Characterization of Corrosion Behavior of Irradiated X65 Low Carbon Steel in Aerobic and Unsaturated Gaomiaozi Bentonite

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