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<p>The objective of this study is to find an alloy with excellent corrosion resistance that can be used as a structural material for molten salt reactors (MSRs). For this purpose, a corrosion test is conducted using Fe- and Ni-based alloys with different Mo and Cr contents in a chlorine-based molten salt. The corrosion behaviors of 316L stainless steel (SUS316L), Hastelloy C-276, and Hastelloy N are compared by conducting an accelerated experiment at a temperature higher than the operating temperature of the MSR in the presence of oxygen, moisture, and Cl– ions. SUS316L, which has a low Mo content, exhibits corrosion along the grain boundaries, whereas Hastelloy N, which has a low Cr content, exhibits corrosion on the surface. Hastelloy C-276, which has high Cr and Mo contents, exhibits a lower corrosion depth and weight loss rate compared with the other samples. The results reveal that corrosion in a chloride environment depends on the Cr and Mo contents.</p>

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Corrosion effect of Fe- and Ni-based alloys for molten salt reactors according to additional trivalent salt

  • 期刊论文

  • 发表日期：

    2025年4月4日

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  • Su Hyeong Kim,
  • Jisu Na,
  • Sung Joong Kim,
  • Dong-Joo Kim,
  • Young Soo Yoon

摘要

The objective of this study is to find an alloy with excellent corrosion resistance that can be used as a structural material for molten salt reactors (MSRs). For this purpose, a corrosion test is conducted using Fe- and Ni-based alloys with different Mo and Cr contents in a chlorine-based molten salt. The corrosion behaviors of 316L stainless steel (SUS316L), Hastelloy C-276, and Hastelloy N are compared by conducting an accelerated experiment at a temperature higher than the operating temperature of the MSR in the presence of oxygen, moisture, and Cl– ions. SUS316L, which has a low Mo content, exhibits corrosion along the grain boundaries, whereas Hastelloy N, which has a low Cr content, exhibits corrosion on the surface. Hastelloy C-276, which has high Cr and Mo contents, exhibits a lower corrosion depth and weight loss rate compared with the other samples. The results reveal that corrosion in a chloride environment depends on the Cr and Mo contents.