316L不锈钢表面核素Co的扩散行为研究  

Diffusion Behavior of Nuclide Co on 316L Stainless Steel Surface

作　　者：陈扬帆 王永强[1] 黄超 邓健[1] Chen Yangfan;Wang Yongqiang;Huang Chao;Deng Jian(School of Mechanical Engineering,University of South China,Hengyang,Hunan 421000,China)

机构地区：[1]南华大学机械工程学院,湖南衡阳421000

出　　处：《机电工程技术》2023年第3期80-83,共4页Mechanical & Electrical Engineering Technology

基　　金：湖南省自然科学基金面上项目(编号:2021JJ30578);国家重点基础研究发展计划(编号:2019YFC1907704)。

摘　　要：压水堆一回路在长期运行期间,其不锈钢管道内核素60Co沉积扩散,导致核退役过程中产生了大量的放射性金属废物。为探究钴元素在不锈钢表面的腐蚀及扩散行为,采用非放射性的Co2+溶液对316L不锈钢表面进行施镀,再通过热处理的方式加快钴元素向不锈钢基材内部的扩散,制备出钴污染模拟样。利用辉光光谱仪(GD-OES)、扫描电镜(SEM)和能谱仪(EDS)对样品表面形貌以及元素分布进行分析,结果表明:通过在316L不锈钢表面电镀一层50μm以上的纯钴镀层后,再用马弗炉837 K保温48 h,Co元素可向不锈钢基材内渗透9μm的深度。During the long-term operation of pressurized water reactor,the deposition and diffusion of nuclide 60Co in the primary stainless steel pipeline lead to the generation of a large amount of radioactive metal waste in the process of nuclear decommissioning.In order to explore the corrosion and diffusion behavior of cobalt on the surface of stainless steel,this paper uses non-radioactive Co2+solution to plating the surface of 316L stainless steel,and then through heat treatment to accelerate the diffusion of cobalt into the stainless steel substrate,so as to prepare a cobalt pollution simulation sample.The surface morphology and element distribution of the samples were analyzed by glow spectrometer(GD-OES),scanning electron microscope(SEM)and energy dispersive spectrometer(EDS).The results showed that:By plating a layer of pure cobalt over 50μm on the surface of 316L stainless steel,and then holding it at 837 K in Muffle furnace for 48 h,Co element can penetrate into the stainless steel substrate to a depth of 9μm.

关 键 词：316L不锈钢 钴 热扩散 

分 类 号：TG111.6[金属学及工艺—物理冶金]