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Effect of oxygen impurity in sodium–potassium melt on the corrosion processes at the interface between vanadium alloy and eutectic melt

Authors
  • Krasin, V. P.1
  • Lyublinski, I. E.1, 2
  • Sojustova, S. I.1
  • Semenov, V. V.2
  • 1 Moscow Polytechnic University, Moscow, 129626, Russia , Moscow (Russia)
  • 2 JSC Red Star, Moscow, 115230, Russia , Moscow (Russia)
Type
Published Article
Journal
Inorganic Materials: Applied Research
Publisher
Pleiades Publishing
Publication Date
Mar 01, 2017
Volume
8
Issue
2
Pages
260–267
Identifiers
DOI: 10.1134/S2075113317020125
Source
Springer Nature
Keywords
License
Yellow

Abstract

An analysis of available experimental data on thermodynamic activity coefficient of oxygen in binary liquid metal Na–K alloys is carried out. Thermodynamic correlations based on the coordination cluster model are used for theoretical evaluation of the effect of oxygen impurity on the solubility of vanadium in sodium–potassium eutectic alloy in the temperature range of 400–800°C. Isothermal capsule experiments qualitatively confirm the results of calculations of vanadium solubility in Na–K melt. On the basis of derived thermodynamic relationships the threshold concentration for the formation of ternary oxide NaVO2 on the surface of the solid vanadium in the Na0.32K0.68 melt has been calculated. The calculation results are compared with the corresponding values for the sodium coolant.

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