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<p><b>Abstract</b>—The melt of alkali metal fluorides, FLiNaK (46.5 LiF–11.5 NaF–42.0 KF mol %), is a promising technological medium for use as a fuel salt and coolant in developing molten salt nuclear reactors (MSRs). Since this salt composition aggressively affects structural materials, there is a need to develop fundamentally new corrosion protection methods. One of the possible approaches to monitoring and controlling the corrosive activity of a molten salt medium is to control its redox potential. In this work, we investigate the influence of a change in the redox potential of a medium, which is controlled by introducing titanium fluorides in the salt electrolyte composition (fraction of trivalent titanium fluoride in a TiF<sub>4</sub>/TiF<sub>3</sub> additive is 5–95%), on the corrosion characteristics of 12Kh18N10T stainless steel in FLiNaK. Corrosion tests are performed at 550°C for 100 h in an inert argon atmosphere with a water content below 0.1 ppm and an oxygen below 10 ppm. The redox potential of the medium is measured relative to a dynamic potassium reference electrode (K<sup>+</sup>/K). An increase in the fraction of trivalent titanium fluoride in an introduced TiF<sub><i>n</i></sub> additive is found to decrease the redox potential (from 2.26 to 1.54 V relative to K<sup>+</sup>/K) and the corrosion rate of the steel (from 3.041 ± 0.021 to 0.628 ± 0.016 g/(m<sup>2</sup> h)).</p>

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Effect of the Redox Potential of a Medium on the Degradation of 12Kh18N10T Steel the FLiNaK–TiF4/TiF3 Melt

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • K. E. Seliverstov,
  • E. A. Karfidov,
  • E. V. Nikitina,
  • A. E. Dedyukhin

摘要

Abstract—The melt of alkali metal fluorides, FLiNaK (46.5 LiF–11.5 NaF–42.0 KF mol %), is a promising technological medium for use as a fuel salt and coolant in developing molten salt nuclear reactors (MSRs). Since this salt composition aggressively affects structural materials, there is a need to develop fundamentally new corrosion protection methods. One of the possible approaches to monitoring and controlling the corrosive activity of a molten salt medium is to control its redox potential. In this work, we investigate the influence of a change in the redox potential of a medium, which is controlled by introducing titanium fluorides in the salt electrolyte composition (fraction of trivalent titanium fluoride in a TiF4/TiF3 additive is 5–95%), on the corrosion characteristics of 12Kh18N10T stainless steel in FLiNaK. Corrosion tests are performed at 550°C for 100 h in an inert argon atmosphere with a water content below 0.1 ppm and an oxygen below 10 ppm. The redox potential of the medium is measured relative to a dynamic potassium reference electrode (K+/K). An increase in the fraction of trivalent titanium fluoride in an introduced TiFn additive is found to decrease the redox potential (from 2.26 to 1.54 V relative to K+/K) and the corrosion rate of the steel (from 3.041 ± 0.021 to 0.628 ± 0.016 g/(m2 h)).