Effect of cumulative gamma irradiation on microstructure and corrosion behaviour of X65 low carbon steel
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第11期
论文作者：Canshuai Liu Jianqiu Wang Zhiming Zhang En-Hou Han Wei Liu Dong Liang Zhongtian Yang Xingzhong Cao
文章页码：2131 - 2139
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.
Canshuai Liu1,2，Jianqiu Wang1，Zhiming Zhang1，En-Hou Han1，Wei Liu3，Dong Liang3，Zhongtian Yang3，Xingzhong Cao4
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 Protection4. Key Laboratory of Nuclear Analysis Techniques,Institute of High Energy Physics,CAS
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.
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