【摘要】 磁性温度感知合金可用于钠冷快堆非能动停堆系统,当堆内温度高于磁性合金居里点时,与合金连接的控制棒掉落堆芯,实现安全停堆。本工作对新研发的Fe-Ni磁性温度感知合金与530℃、560℃、600℃高温核级钠相容性开展了试验研究;试验后,进行了腐蚀深度、微观形貌以及表面腐蚀产物等分析。结果表明:试验后Fe-Ni合金表现为微小增重,随温度升高平均增重率升高;结合宏观形貌和线扫描能谱分析,表明样品表面形成了含锰氧化膜,该膜层可有效地阻止材料组分元素的溶解。经高温钠浸泡后,样品表面未发现点腐蚀和晶间腐蚀等局部腐蚀迹象,表明材料在高温钠中有较好的耐蚀性能。更多还原

【Abstract】 Magnetic alloys are suggested to be used as structural materials for passive shut-down system in sodium-cooled fast reactor. When the temperature in the reactor exceeds the Curie temperature of the magnetic alloy, the control rod connected with magnetic alloy would insert into core to shut down the reactor. This paper presents the investigation on the compatibility of Fe-Ni magnetic alloy with high temperature sodium at 530 ℃, 560 ℃ and 600 ℃, respectively. After corrosion tests, a series of examinations including morphology analysis, corrosion rate evaluation, SEM analysis were performed. The results showed that, the weight of all specimens increased slightly after testing, and the average weight gain increased as the temperature rose. According to morphology analysis and EDS line scan analysis, a manganese oxide layer formed on the surface of samples, which could prevent the steel elements dissolving into sodium. No pitting corrosion and intergranular corrosion were detected, the materials showed a good corrosion resistance in sodium at high temperature.更多还原