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Effect of cumulative gamma irradiation on microstructure and corrosion behaviour of X65 low carbon steel

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;Xingzhong [4]Cao 高影响力作者 机构地区：[1]Key Laboratory of Nuclear Materials and Safety Assessment,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[2]University of Chinese Academy of Sciences,Shenyang 110016,China;[3]China Institute for Radiation Protection,Taiyuan 030006,Shanxi,China;[4]Key Laboratory of Nuclear Analysis Techniques,Institute of High Energy Physics,CAS,100049 Beijing,China高影响力机构 出　　处：《Journal of Materials Science & Technology》索引2018年第34卷第11期,共9页高影响力期刊 基　　金：supported by Key Research Program of Frontier Sciences,Chinese Academy of Sciences[QYZDY-SSWJSC012];National Natural Science Foundation[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：X65 low carbon steel was exposed to Co-60 radiation source with 1.25 MeV gamma rays, and cumulatively absorbed gamma irradiation doses(1, 2, and 3 MGy) were obtained after different exposure time(333, 667, and 1000 h). The effect of cumulative gamma irradiation on microstructure and corrosion behaviour of the carbon steel in unirradiated aerobic Beishan groundwater at 25?C was investigated by using positron annihilation, scanning vibrating electrode, and electrochemical techniques. Cumulative gamma irradiation increases vacancy intensity and decreases open circuit potential(OCP) of carbon steel. They indicate that the irradiated carbon steel is activated. Measured current density distribution above the irradiated carbon steel shows that cumulative gamma irradiation accelerates localized corrosion after 0.5 h of immersion. In contrast, the analysis of electrochemical impedance spectroscopy of the irradiated carbon steel indicates that localized corrosion is transformed into general corrosion after 12 h of immersion, which is also accelerated by cumulative gamma irradiation. 关 键 词：GAMMA 腐蚀行为 微观结构 低碳钢 累积 电气化学 暴露时间 正电子
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