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Investigation of the corrosion resistance of nickel-based alloys in fluoride melts

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Abstract

The results of tests of the compatibility of nickel-based alloys and metal-fluoride melts are generalized for molten-salt reactors.

The structure and strength characteristics of the alloys Kh80MTYu, KhN80M-VI, and MONIKR in the initial state, after thermomechanical treatment and quenching, exposure for 1200 h to thermal convection loop filled with 58NaF-15LiF-27BeF2 with heating by 100°C, are investigated. A method for removing impurities from the melt has been developed.

The results of corrosion tests performed on samples of nickel-based alloys in a setup with natural circulation with maximum melt temperature up to 700°C and redox potential of the system 1.25–1.33 V relative to a beryllium comparison electrode are presented. It is shown that deep removal of oxidizing impurities from the melt and maintaining a low redox potential give slow uniform corrosion (less than 5 µm/yr) of Kh80MTYu and KhN80M-VI samples. After the tests were completed, none of the alloys studied exhibited any tendency toward intercrystallite absorption.

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Authors and Affiliations

  1. Russian Science Center Kurchatov Institute, Russia

    V. V. Ignat’ev, A. I. Surenkov, I. P. Gnidoi, V. I. Fedulov & V. S. Uglov

  2. Russian Federal Nuclear Center — All-Russia Research Institute of Technical Physics, Russia

    A. V. Panov, V. V. Sagaradze, V. G. Subbotin & A. D. Toropov

  3. Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences, Russia

    V. K. Afonichkin & A. L. Bove

Authors
  1. V. V. Ignat’ev
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  2. A. I. Surenkov
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  3. I. P. Gnidoi
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  4. V. I. Fedulov
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  5. V. S. Uglov
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  6. A. V. Panov
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  7. V. V. Sagaradze
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  8. V. G. Subbotin
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  9. A. D. Toropov
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  10. V. K. Afonichkin
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  11. A. L. Bove
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Translated from Atomnaya Énergiya, Vol. 101, No. 4, pp. 278–286, October, 2006.

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Ignat’ev, V.V., Surenkov, A.I., Gnidoi, I.P. et al. Investigation of the corrosion resistance of nickel-based alloys in fluoride melts. At Energy 101, 730–738 (2006). https://doi.org/10.1007/s10512-006-0160-y

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  • DOI: https://doi.org/10.1007/s10512-006-0160-y

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