铅冷快堆堆内结构元件长期工作于强中子辐照、高温冷却剂等极端环境中，其服役性能会不断退化进而影响反应堆的运行安全。中子辐照和冷却剂耦合环境中构件材料腐蚀动力学行为研究在国际上备受关注，是铅冷快堆发展面临的迫切需要解决的关键科学问题之一。本项目选择铅冷快堆可能的候选结构材料马氏体钢为研究对象，依托近物所重离子加速器(HIRFL)和液态LBE腐蚀实验平台，采用“离子辐照+LBE腐蚀”实验方法，以材料近表面腐蚀层生成与演化为研究主线，深入开展不同条件下马氏体钢中辐照损伤影响液态LBE腐蚀动力学研究，建立材料近表面腐蚀层形成、生长演化的动力学规律，获得马氏体钢在辐照和液态LBE耦合环境中腐蚀性能评价数据。在此基础上，结合理论模拟计算，探索辐照损伤影响马氏体钢液态LBE腐蚀动力学的物理机制，尝试建立铅冷快堆结构材料腐蚀寿命预测模型，为我国未来铅冷快堆结构材料选择和寿命评估提供重要的科学依据和数据支撑。

Core structural components Long-term served in lead cooled fast reactor (LFR) always endure extreme conditions of intensive high energy neutron irradiations and coolant Corrosions. Such harsh environment will gradually deteriorate the service performance of structural components, thus affect safe operations of the nuclear reactor. The evolution of corrosion kinetics of structural materials under combined neutron radiation and corrosive coolant has attracted much attentions worldwide, and are one of the key issues needed to be solved urgently for research and development (R&D) of LFR. Relying on HIRFL and facilities for compatibility testing of lead bismuth eutectic (LBE) and materials, a martensitic steel considered as an important candidate material for future LFR will be selected to systematically investigate the influence of irradiation damage on the corrosion kinetics in this study. Taking the formation and evolution of corrosion layers on the material surface as a main research direction, it aims to establish a dynamic law of the formation, growth and evolution of corrosion layer of martensitic steel under irradiation. Through the obtained data, an evaluation of LBE corrosion performance of the martensitic steel under irradiation will be gained. Based on these approaches, the mechanism of the effect of irradiation damage on the corrosion kinetics of LBE towards martensitic steel will be explored by combined with computer calculations. Through this study, it is expected to obtain a corrosion lifetime prediction model, and thus provide basic scientific rules and databases for the material selection and service lifetime assessment of core structural components for China’s future LFRs.