ODS钢液态重金属环境腐蚀研究进展

铅基快堆(Lead-cooled fast reactor,LFR)采用液态重金属(铅/铅铋合金)作为冷却剂,具有高安全性、高经济性等特点,并且在核能可持续发展方面具有一定的优势,目前被列为第四代核能系统六种参考堆型之一。液态金属冷却剂在服役过程中具有高温、高流速和高密度等特点,会对堆芯结构材料产生严重的腐蚀破坏。纳米氧化物弥散强化钢(Oxide dispersion strengthened steel,ODS)具有优异的抗辐照性能和优良的高温力学性能,目前已经成为先进快中子反应堆堆芯候选结构材料研究热点,其抗液态金属冷却剂腐蚀的能力是影响反应堆安全运行的关键性能之一。对目前有代表性的ODS钢在液态重金属环境中的腐蚀研究进展进行了综述,并结合ODS钢在氧化性气体环境和超临界水中的氧化腐蚀研究进展,对影响ODS钢液态金属腐蚀行为的因素进行了讨论。

Research Progress of ODS Steels Corrosion in Heavy Liquid Metal Environment

Lead-cooled fast reactor (LFR) has been selected as one of the six reactor concepts in the generation IV technology roadmap. The LFR system's enhanced safety and economic performance are of great importance for the choice of a next-generation nuclear system. However,the structural materials of reactor core suffer serious corrosion damage caused by LFR's coolant-heavy liquid metal due to the high density,high flowing rate and high temperature during operation. Oxide dispersion strengthened (ODS) steel,which has excellent irradiation resistance and high temperature mechanical behavior,has been selected as candidate structural material of the advanced fast neutron reactor. The compatibility of ODS steel in contact with heavy liquid metal is one of the key characteristics for the safety of LFR system. The current research progress of ODS steels corrosion in heavy liquid metal environment is reviewed. The factors affecting the corrosion behavior in liquid metal are discussed combined with the oxidation corrosion results in oxidizing gas mixture and supercritical water environment.