模拟高放废物深地质处置条件下Se在铁基材料上的氧化还原行为  

Redox Behavior of Se on Iron-Based Materialsin Simulated Geological Disposal Environment of HLW

作　　者：许强伟 方升 刘晨 龙浩骑[1] 陈曦[1] 王波[1] 徐毓炜 周舵[1] XU Qiang-wei;FANG Sheng;LIU Chen;LONG Hao-qi;CHEN Xi;WANG Bo;XU Yu-wei;ZHOU Duo(China Institute of Atomic Energy,P.O.Box 275(93),Beijing 102413,China)

机构地区：[1]中国原子能科学研究院放射化学研究所,北京102413

出　　处：《核化学与放射化学》2022年第6期627-634,I0005,共9页Journal of Nuclear and Radiochemistry

摘　　要：以铁基材料(纯铁和304L不锈钢)和Na_(2)SeO_(4)/Na_(2)SeO_(3)溶液为研究对象,依托低氧手套箱,在常温、低氧条件下,采用静态批式法开展了Se(Ⅵ/Ⅳ)和铁基材料氧化还原作用研究,利用离子色谱法分析研究浸泡铁基材料的Na_(2)SeO_(4)溶液和Na_(2)SeO_(3)溶液浓度变化,运用扫描电子显微镜(SEM)、X射线能谱分析(EDS)和拉曼光谱(Raman)等技术,对反应前后铁基材料样品的表观形貌、元素分布、物相组成进行较为系统的物理-化学表征。结果表明,SeO_(4)^(2-)/SeO_(3)^(2-)在纯铁体系中的反应速率明显快于其在304L不锈钢体系中的反应速率;铁基材料还原SeO_(3)^(2-)的速率快于SeO_(4)^(2-)的。In this paper,reduction-oxidation between Se and iron-based materials(pure iron and 304L stainless steel)was carried out in glove box under ambient temperature and low-oxygen.Using ion chromatography to analyse the concentration changes of sodium selenate solution and sodium selenite solution in which iron-based materials were immersed.The iron-based material samples before and after the reaction were analysed by scanning electron microscopy(SEM),energy dispersive spectrometer(EDS)and Raman spectrometry.The results show that the oxidation-reduction reaction rate of SeO_(4)^(2-)/SeO_(3)^(2-) and pure iron is significantly faster than that of SeO_(4)^(2-)/SeO_(3)^(2-) and 304L stainless steel;the reaction rate of iron-based materials and SeO_(3)^(2-) is higher than that of iron-based materials and SeO_(4)^(2-).

关 键 词：低氧 铁基材料 SE 氧化还原 

分 类 号：TL941[核科学技术—辐射防护及环境保护]