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Corrosion Electrochemical Behavior of Molybdenum in the LiCl–KCl Melt Containing Additives of Cerium and Neodymium Trichlorides

Authors
  • Kazakovtseva, N. A.1
  • Mazannikov, M. V.1, 2
  • Nikitina, E. V.1, 2
  • Karfidov, E. A.1, 2
  • Potapov, A. M.1, 2, 3
  • 1 Institute of High-Temperature Electrochemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia , Yekaterinburg (Russia)
  • 2 Ural Federal University, Yekaterinburg, Russia , Yekaterinburg (Russia)
  • 3 Ural State Mining University, Yekaterinburg, Russia , Yekaterinburg (Russia)
Type
Published Article
Journal
Russian Metallurgy (Metally)
Publisher
Pleiades Publishing
Publication Date
Aug 03, 2020
Volume
2020
Issue
8
Pages
925–931
Identifiers
DOI: 10.1134/S0036029520080066
Source
Springer Nature
Keywords
License
Yellow

Abstract

AbstractThe corrosion electrochemical behavior of molybdenum depending on the melt composition (imitators of spent nuclear fuel (SNF) components) in an oxidizing atmosphere is studied. Thermodynamic analysis of possible corrosion processes is performed using the HSC Chemistry 9.0 software in the Equilibrium calculations module. The rate of metal corrosion is estimated using gravimetry. The real products of the corrosion process and those expected from the thermodynamic calculations are compared using electron probe microanalysis (EPMA) and X-ray diffraction (XRD) analysis. The molybdenum concentration in frozen melt samples is studied by an atomic absorption method. The rate of molybdenum corrosion depends on the testing time. The decrease in the corrosion rate in time can be explained by the accumulation of Nd3+ and Ce3+ ions in the near-electrode layer, and corrosion occurs in the diffusion mode. The corrosive activity of the salt melt increases with the temperature and the ionic strength of the melt.

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