Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (4): 506-516.DOI: 10.1007/s40195-018-0760-2

Special Issue: 2019年腐蚀专辑-1

• Orginal Article • Previous Articles     Next Articles

Characterization of Corrosion Behavior of Irradiated X65 Low Carbon Steel in Aerobic and Unsaturated Gaomiaozi Bentonite

Canshuai Liu1,2, Jianqiu Wang1(), Zhiming Zhang1, En-Hou Han1, Wei Liu3, Dong Liang3, Zhongtian Yang3   

  1. 1 Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
    2 University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
    3 China Institute for Radiation Protection, Taiyuan 030006, China
  • Received:2018-03-22 Revised:2018-04-25 Online:2019-04-10 Published:2019-04-19
  • Contact: Wang Jianqiu
  • About author:

    Dr. Kun-Kun Deng was born in 1983 and was awarded Ph. D in Harbin University of Technology in 2011. After graduation, he worked in the College of Materials Science and Engineering, Taiyuan University of Technology. At the same time, he continued his research work on the design, fabrication and processing of advanced Mg-based material in. Now, he is the vice chairman of Youth Committee in Magnesium Alloy Branch of Chinese Materials Research Society. He was denoted as young academic pacemaker of Shanxi Province in 2018. He has held two projects of National Nature Science Foundation of China, one project of Specialized Research Fund for the Doctoral Program of Higher Education, one Project of International Cooperation in Shanxi and two projects of Natural Science Foundation of Shanxi. He has published more than 60 articles. The time cited is more than 840 (without selfcitations), and the H-index is 22. In addition, he has published one academic monograph and acquired eight Chinese patents.

Abstract:

2.98 kGy/h (1007 h) gamma irradiation and 90 °C (2000 h) thermal aging were exerted to X65 grade low carbon steel buried in Gaomiaozi bentonite containing 17 wt% Beishan groundwater. The average corrosion rate of X65 low carbon steel was measured. The elemental and phase distribution on cross section was characterized by using electron probe micro-analysis, high-resolution X-ray diffraction, and micro-X-ray diffraction. The following conclusions can be made: the average aerobic corrosion rate of the carbon steel is (45.16 ± 1.53) μm/year. Taking the original surface as boundary, the corrosion scale is divided into an internal dense product layer (DPL) mainly composed of Fe3O4 with segregated FeCO3 at the corrosion front and an external DPL mainly composed of Fe3O4 with segregated α-Fe2O3 and bentonite at some relics. Si, S, and Cl are concentrated at the corrosion front of the internal DPL, while Si and Al are concentrated at the external DPL.

Key words: Low carbon steel, Corrosion rate, Phase distribution, Elemental concentration