Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (10): 153 doi: 10.1007/s41365-019-0673-4

• ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

XAFS and SRGI-XRD studies of the local structure study of tellurium corrosion of Ni-18%Cr alloy

Mi Luo1,5, Sheng-Jue Deng3, Li Li1,2, Fei Song 1,2, Li-Hua Wang1,2, Zhi-Jun Li 4, Zheng Jiang 1,2   

  1. 1Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
    2Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
    3State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
    4Center for Thorium Molten Salts Reactor System, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    5University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2019-02-23 Revised:2019-05-24 Accepted:2019-06-01
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (No. 2016YFB0700404), National Natural Science Foundation of China (No. U1732267), National Natural Science Foundation of China (Nos. 51671122 and 51671154); Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA02004210), and Talent Development Fund of Shanghai (No. 201650).
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Mi Luo, Sheng-Jue Deng, Li Li, Fei Song, Li-Hua Wang, Zhi-Jun Li, Zheng Jiang. XAFS and SRGI-XRD studies of the local structure study of tellurium corrosion of Ni-18%Cr alloy .Nuclear Science and Techniques, 2019, 30(10): 153     doi: 10.1007/s41365-019-0673-4

Abstract: The speciation and atomic structures of corrosion products in Ni-based alloys could provide basic information for understanding the Te corrosion mechanism. In this paper, two-dimensional synchrotron-radiation-induced grazing-incidence X-ray diffraction (2D SRGI-XRD) was used to characterize the corrosion products of a Ni-18%Cr binary alloy at temperatures from 600 °C to 1000 °C. The results showed that a film of CrTe is preferentially formed when Te reacts with the Ni-based alloy at low temperatures (below 900 °C), while CrTe and Ni3Te2 are formed at 900 °C. Moreover, at a temperature of 1000 °C, a solid solution is formed without any changes in the Ni-Cr substrate lattice parameters. Furthermore, X-ray absorption fine structure (XAFS) and wavelet transform (WT) analyses were used to investigate the atomic local structure of Te. The investigation indicated that Te atoms diffuse into the Ni-Cr substrate to form a substitutional Ni-Cr-Te solid solution at 1000 °C. Notably, based on a discussion of the thermodynamics of the chemical reaction process, CrTe is considered to be the most stable and prevalent corrosion product due to its comparatively lower Gibbs free energy of formation. These results demonstrate that the Ni-18%Cr alloy is capable of resisting the diffusion of Te atoms.

Key words: Ni-Cr alloy, X-ray absorption spectroscopy (XAS), High temperature diffusion, Gibbs free energy, Solid solution