Corrosion behavior of high-level waste container materials Ti and Ti-Pd alloy under long-term gamma irradiation in Beishan groundwater  

作　　者：Qianglin Wei Yuhong Li Yanliang Huang Dongyan Yang Bo Yang Yibao Liu 魏强林;李玉红;黄彦良;杨冬燕;杨波;刘义保(School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China;Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China)

机构地区：[1]School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China [2]State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China [3]Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China

出　　处：《Chinese Physics B》2021年第5期93-100,共8页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.51471160,11775102,and 11965001);the Fundamental Research Funds for the Central Universities,China(Lanzhou University,Grant No.lzujbky-2018-19).

摘　　要：Titanium and titanium-palladium alloys are important potential materials for nuclear waste container,which will endure both intenseγ-irradiation and groundwater erosion.Therefore,it is very important to investigate the corrosion behavior of the container materials.In this research,the cumulative dose effect of TA8-1 type titanium-palladium alloy(TA8-1)and TA2-type pure titanium(TA2)underγ-irradiation was studied based on the geological disposal of nuclear wastes.The irradiation experiments were performed at room temperature using^(60)Co gamma sources with a 5.0-kGy·h^(-1)intensity for 40,80 or 160 days,respectively.The pH value and conductivity of Beishan groundwater were investigated.The results showed that the pH value changed from alkaline(8.22)to acidic(2.46 for TA8-1 and 2.44 for TA2),while the un-irradiated solution remained alkaline(8.17 for TA8-1 and 8.20 for TA2)after 160 days.With the increase of irradiation dose,the conductivity increases rapidly and then tends to become stable,which indicates that the titanium dioxide corrosion layer formed on the surface of the sample surface effectively prevents further corrosion.Meanwhile,XRD and SEM-EDS analysis results show that the main components of corrosion products are TiO_(2) and TiO.The titanium on the surface of the sample is oxidized,resulting in slight uneven local corrosion.The results show that TA8-1 and TA2 are suitable to be used as candidate materials for high-level waste(HLW)disposal containers due to their excellent performance under long-term and high-dose irradiation corrosion.

关 键 词：Γ-IRRADIATION CORROSION high-level waste container material 

分 类 号：TG174.3[金属学及工艺—金属表面处理] TL942[金属学及工艺—金属学]