Plasma and Fusion Research

Volume 13, 3405079 (2018)

Regular Articles

Corrosion Mitigation of Ferritic Steels in HF-Containing FLiNaK by Titanium Sacrificial Anodes
Gaku YAMAZAKI1), Juro YAGI1,2), Teruya TANAKA1,2), Takashi WATANABE2) and Akio SAGARA1,2)
1)
SOKENDAI (The Graduate University for Advanced Studies), Toki 509-5292, Japan
2)
National Institute for Fusion Science, Toki 509-5292, Japan
(Received 28 December 2017 / Accepted 16 May 2018 / Published 25 June 2018)

Abstract

Sacrificial anode methods are focused upon for suppression of the tritium fluoride corrosion of structural materials in molten salt blankets in fusion reactors. Stainless Steel 430 (SS430) is immersed into hydrogen fluoride (HF)-containing LiF-NaF-KF (FLiNaK) for 6 hours at 773 K with Ti. It has been found that (1) the presence of Ti suppresses the corrosion of SS430 by HF. Further, by the electrical connection between SS430 and Ti, (2) Ti can sufficiently lower the potential of SS430, (3) the weight loss of Ti increases, and (4) the grain boundary corrosion of SS430 by Cr dissolution is mitigated. The applicability of sacrificial anode methods to molten salt blankets has been established.

Keywords

corrosion protection, FLiNaK, titanium, hydrogen fluoride, sacrificial anode, electrochemistry

DOI: 10.1585/pfr.13.3405079

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References

  • [1] A. Sagara et al., Fusion Eng. Des. 89, 2114 (2014).
  • [2] S. Delpech et al., Mater. Today 13, 34 (2010).
  • [3] D. Olander, J. Nucl. Mater. 300, 270 (2002).
  • [4] M.F. Simpson et al., Fusion Eng. Des. 81, 541 (2006).
  • [5] P. Calderoni et al., J. Nucl. Mater. 386, 1102 (2009).
  • [6] G. Yamazaki et al., Fusion Eng. Des. (in press).
  • [7] M. Kondo et al., Fusion Eng. Des. 85, 1430 (2010).
  • [8] M. Kondo et al., Fusion Eng. Des. 84, 1081 (2009).
  • [9] A.J. Bard et al. (Eds.), Standard Potentials in Aqueous Solution (Marcel Dekker, 1985).
  • [10] L.C. Olson et al., J. Fluorine Chem. 130, 67 (2009).
  • [11] M. Kondo et al., J. Nucl. Mater. 386-388, 685 (2009).