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<p>Molten salt reactors offer several key advantages over currently deployed generation III reactors, including lower operating pressure, higher operating temperature, and potential recycling of transmutated constituents. However, the degradation of containment vessel materials by the molten salt is a known issue that requires additional focused research. Nickel-based alloys have been investigated for their resistance to molten salt corrosion, but few studies have investigated the combined effects of corrosion and irradiation simultaneously. This study evaluates the 550°C NaCl-CeCl<sub>3</sub> molten salt corrosion of pure Ni samples exposed to static corrosion as well as corrosion and simultaneous 5.8&#xa0;MeV proton irradiation. Microstructure analysis via scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM) suggests corrosion is accelerated by proton irradiation. Specifically, during the combined irradiation and corrosion experiment, after only 35&#xa0;min of beam exposure, characterization of the microstructure of the sample reveals grain growth, faceting, and widening of the grain boundaries. However, it is important to note that it is challenging, if not impossible, to determine whether the driving mechanism for each phenomenon is the beam interaction with the sample (beam heating) or irradiation damage.</p>

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Coupled Proton Beam Irradiation and Molten Chloride Salt Corrosion of Nickel

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Elizabeth S. Sooby,
  • Patrick Henry Warren,
  • Joseph Tesmer,
  • Robert Houlton,
  • Stephen Scott Parker,
  • Michelle Voges,
  • Peter M. McIntyre,
  • Yongqiang Wang

摘要

Molten salt reactors offer several key advantages over currently deployed generation III reactors, including lower operating pressure, higher operating temperature, and potential recycling of transmutated constituents. However, the degradation of containment vessel materials by the molten salt is a known issue that requires additional focused research. Nickel-based alloys have been investigated for their resistance to molten salt corrosion, but few studies have investigated the combined effects of corrosion and irradiation simultaneously. This study evaluates the 550°C NaCl-CeCl3 molten salt corrosion of pure Ni samples exposed to static corrosion as well as corrosion and simultaneous 5.8 MeV proton irradiation. Microstructure analysis via scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM) suggests corrosion is accelerated by proton irradiation. Specifically, during the combined irradiation and corrosion experiment, after only 35 min of beam exposure, characterization of the microstructure of the sample reveals grain growth, faceting, and widening of the grain boundaries. However, it is important to note that it is challenging, if not impossible, to determine whether the driving mechanism for each phenomenon is the beam interaction with the sample (beam heating) or irradiation damage.