乏燃料池中钴在不锈钢覆面的沉积规律研究  

Deposition rule of cobalt on stainless steel cladding in spent fuel pool

作　　者：招观荣 雷泽勇[1] 邓健[1] 赵木 李全兴 ZHAO Guan-rong;LEI Ze-yong;DENG Jian;ZHAO Mu;LI Quan-xing(College of Mechanical Engineering,University of South China,Hengyang 421001,Hunan Province,China;CNNC Environmental Protection Engineering Design&Research Co.,Ltd.,Hengyang 421001,Hunan Province,China)

机构地区：[1]南华大学机械工程学院,湖南衡阳421001 [2]中核环保工程设计研究有限公司,湖南衡阳421001

出　　处：《化学工程》2023年第1期26-29,35,共5页Chemical Engineering(China)

基　　金：国家重点基础研究发展计划项目(2019YFC1907704)。

摘　　要：为在普通实验室对乏燃料池中^(60)Co在不锈钢表层的沉积规律进行研究,采用放射性核素^(60)Co的稳定同位素^(59)Co模拟乏燃料池水环境(温度60℃),以避免真实放射性环境带来的影响。进行304不锈钢浸泡腐蚀实验,采用扫描电镜(SEM)、能谱仪(EDS)及辉光放电质谱仪(GDOES)对不锈钢样品表面与截面进行微观形貌与成分分析。结果表明:钴元素大部分沉积在不锈钢表层的氧化物中,以浸泡腐蚀70 d为例,氧化层厚度约为0.48μm,钴元素主要沉积在0—0.05μm的氧化层中;溶液的pH值以及溶液中的氯离子对钴元素在不锈钢表面的沉积有明显影响;在pH值为5.2且含氯离子的溶液中,样品浸泡腐蚀30 d的表面钴元素的质量分数最高,相对增长速率达164.58%。In order to study the deposition of^(60)Co on the surface of stainless steel in the spent fuel pool in the general laboratory,and to avoid the effects of real radioactive environment,^(59)Co,a stable isotope of^(60)Co,was used to simulate the water environment of spent fuel pool(60℃).304 stainless steel was immersed in corrosion experiments,and the surface and cross section of stainless steel samples were analyzed by SEM,EDS and GDOES.The results show that according to the immersion corrosion test for 70 days,most of the cobalt is deposited in the oxide layer on the surface of stainless steel,and the thickness of the oxide layer is about 0.48μm,and the cobalt is mainly deposited in the 0-0.05μm oxide layer.The pH of the solution and the chloride ion in the solution have obvious effect on the deposition of cobalt on the surface of stainless steel.In the solution of pH 5.2 and containing chloride ions,the mass fraction of cobalt on the surface of the sample after 30 days of immersion corrosion is the highest,and the relative growth rate reaches 164.58%.

关 键 词：304不锈钢 钴元素 金属腐蚀 

分 类 号：TG174.3[金属学及工艺—金属表面处理]