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<p>The strong corrosiveness of molten chloride salt seriously restricts its commercial applications. In this paper, the corrosion mechanism of Ni-based alloy GH3539 in molten (Na,K,Ca)Cl at 800&#xa0;°C under Air and Ar atmosphere was investigated. The results indicated that GH3539 exhibited significant corrosion damage with a mass loss of 62.8&#xa0;mg·cm<sup>−2</sup> for 100&#xa0;h in molten chloride salt under Air environment, which is much severe than that under Ar atmosphere. The corrosion process under Air atmosphere is governed by oxidant diffusion in molten salt and the concentration of Cl<sub>2</sub> in molten salt is calculated to be approximately 410.9&#xa0;ppm. Under Ar atmosphere, corrosion of GH3539 occurs mainly due to the residual impurities such as H<sub>2</sub>O and O<sub>2</sub> in molten chloride salts, manifesting as the selective dissolution of Cr and intergranular corrosion. Additionally, some metallic matrix is carried away by the peeling off of CaO on the surface.</p>

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Investigation on the Corrosion of Ni-Based Alloy GH3539 in Ternary Molten Chloride Salt

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • Ruoyu Li,
  • Jinning Huang,
  • Chaoliu Zeng,
  • Yanli Wang

摘要

The strong corrosiveness of molten chloride salt seriously restricts its commercial applications. In this paper, the corrosion mechanism of Ni-based alloy GH3539 in molten (Na,K,Ca)Cl at 800 °C under Air and Ar atmosphere was investigated. The results indicated that GH3539 exhibited significant corrosion damage with a mass loss of 62.8 mg·cm−2 for 100 h in molten chloride salt under Air environment, which is much severe than that under Ar atmosphere. The corrosion process under Air atmosphere is governed by oxidant diffusion in molten salt and the concentration of Cl2 in molten salt is calculated to be approximately 410.9 ppm. Under Ar atmosphere, corrosion of GH3539 occurs mainly due to the residual impurities such as H2O and O2 in molten chloride salts, manifesting as the selective dissolution of Cr and intergranular corrosion. Additionally, some metallic matrix is carried away by the peeling off of CaO on the surface.