中国物理B ›› 2021, Vol. 30 ›› Issue (5): 56109-056109.doi: 10.1088/1674-1056/abf03b

所属专题： SPECIAL TOPIC — Ion beam modification of materials and applications

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

Qianglin Wei(魏强林)1,2, Yuhong Li(李玉红)1,†, Yanliang Huang(黄彦良)3, Dongyan Yang(杨冬燕)1, Bo Yang(杨波)2, and Yibao Liu(刘义保)2,‡   

  1. 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
  • 收稿日期:2020-12-21 修回日期:2021-01-23 接受日期:2021-03-19 出版日期:2021-05-14 发布日期:2021-05-14
  • 通讯作者: Yuhong Li, Yibao Liu E-mail:liyuhong@lzu.edu.cn;ybliu@ecut.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51471160, 11775102, and 11965001) and the Fundamental Research Funds for the Central Universities, China (Lanzhou University, Grant No. lzujbky-2018-19).

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

Qianglin Wei(魏强林)1,2, Yuhong Li(李玉红)1,†, Yanliang Huang(黄彦良)3, Dongyan Yang(杨冬燕)1, Bo Yang(杨波)2, and Yibao Liu(刘义保)2,‡   

  1. 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
  • Received:2020-12-21 Revised:2021-01-23 Accepted:2021-03-19 Online:2021-05-14 Published:2021-05-14
  • Contact: Yuhong Li, Yibao Liu E-mail:liyuhong@lzu.edu.cn;ybliu@ecut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 51471160, 11775102, and 11965001) and the Fundamental Research Funds for the Central Universities, China (Lanzhou University, Grant No. lzujbky-2018-19).

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摘要： Titanium and titanium-palladium alloys are important potential materials for nuclear waste container, which will endure both intense γ-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) under γ-irradiation was studied based on the geological disposal of nuclear wastes. The irradiation experiments were performed at room temperature using 60Co 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 TiO2 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

Abstract: Titanium and titanium-palladium alloys are important potential materials for nuclear waste container, which will endure both intense γ-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) under γ-irradiation was studied based on the geological disposal of nuclear wastes. The irradiation experiments were performed at room temperature using 60Co 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 TiO2 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.

Key words: γ-irradiation, corrosion, high-level waste, container material

中图分类号:  (Radiation treatment)

  • 81.40.Wx
61.80.-x (Physical radiation effects, radiation damage) 61.82.Bg (Metals and alloys)