地质处置后期无氧阶段X65低碳钢腐蚀行为研究  

Corrosion Behaivour of X65 Low Carbon Steel During Anaerobic Period of High Level Nuclear Waste Disposal

作　　者：刘灿帅 田朝晖 张志明[1] 王俭秋[1] 韩恩厚[1] LIU Canshuai;TIAN Zhaohui;ZHANG Zhiming;WANG Jianqiu;HAN En-Hou(Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy ofSciences, Shenyang 110016, China;Suzhou Nuclear Power Research Institute Co., Ltd., Suzhou 215008, China)

机构地区：[1]中国科学院金属研究所中国科学院核用材料与安全评价重点实验室,沈阳110016 [2]苏州热工研究院有限公司,苏州215008

出　　处：《腐蚀科学与防护技术》2019年第4期371-378,共8页Corrosion Science and Protection Technology

基　　金：中国科学院前沿科技重点研发计划(QYZDY-SSWJSC012)和中国科学院重点计划(ZDRW-CN-2017-1)~~

摘　　要：X65低碳钢在模拟地质处置后期50℃无氧模拟地下水溶液中的主要腐蚀类型为均匀腐蚀;利用扫描电子显微镜(SEM)、能量散射谱(EDS)和微区X射线衍射仪(μ-XRD)表征X65低碳钢腐蚀产物的形貌、元素和物相组成。结果表明,腐蚀产物有针状和颗粒状两种类型,包含Fe和O两种元素,产物物相为Fe3O4;使用失重法测得X65低碳钢平均腐蚀速率在360d内逐渐从4.17μm/a降低到1.42μm/a,腐蚀速率随时间的变化规律符合降幂函数关系式V50=1.36t-0.56,腐蚀过程受扩散控制。The corrosion type of X65 low carbon steel in an artificial 50 ℃ anaerobic groundwater,which aims to simulate the environment for the later stage of geological disposal of nuclear waste, was studied. It follows that the X65 steel suffered mainly from general corrosion in the simulated groundwater.The morphologies, compositions, and phases of the corrosion product scale formed on the carbon steel surface were examined by using scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDS), and X-ray micro diffraction(μ-XRD). The results indicated that the scale was mainly composed of needle-and particle-oxides, which contain mainly elements of Fe and O, and they are all magnetite. The measured average corrosion rate of the X65 steel decreased gradually from 4.17 μm/a to1.42 μm/a in 360 d, which can be described as a power function V50=1.36 t-0.56, indicating that the film growth process was controlled by diffusion.

关 键 词：地质处置 低碳钢 腐蚀 电化学 扩散 

分 类 号：TG172[金属学及工艺—金属表面处理]