Characterization of Corrosion Behavior of Irradiated X65 Low Carbon Steel in Aerobic and Unsaturated Gaomiaozi Bentonite
来源期刊：Acta Metallurgica Sinica2019年第4期
论文作者：Canshuai Liu Jianqiu Wang Zhiming Zhang En-Hou Han Wei Liu Dong Liang Zhongtian Yang
文章页码：506 - 516
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 Fe3O4 with segregated FeCO3 at the corrosion front and an external DPL mainly composed of Fe3O4 with segregated α-Fe2O3 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.
Canshuai Liu1,2，Jianqiu Wang1，Zhiming Zhang1，En-Hou Han1，Wei Liu3，Dong Liang3，Zhongtian Yang3
1. Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences2. University of Chinese Academy of Sciences3. China Institute for Radiation Protection
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 Fe3O4 with segregated FeCO3 at the corrosion front and an external DPL mainly composed of Fe3O4 with segregated α-Fe2O3 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.
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