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

作　　者：Canshuai Liu Jianqiu Wang Zhiming Zhang En-Hou Han Wei Liu Dong Liang Zhongtian Yang Xingzhong Cao 

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

出　　处：《Journal of Materials Science & Technology》2018年第11期2131-2139,共9页材料科学技术（英文版）

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℃ 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.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℃ 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：A. Irradiation B. Low carbon steel C. Defects D. Potential E. Corrosion 

分 类 号：TG142.1[一般工业技术—材料科学与工程]