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<p>The GH3535 alloy as a candidate material for molten salt metallurgy suffered serious corrosion that threatened the safety of nuclear facility. An amorphous enamel coating based on SiO<sub>2</sub>-B<sub>2</sub>O<sub>3</sub>-Na<sub>2</sub>O-CaO was designed to protect GH3535 alloy in molten LiCl-KCl salt vapor atmosphere at 550&#xa0;°C. Under the protection of this coating, its mass gain was merely 0.31&#xa0;mg/cm<sup>2</sup> after 300&#xa0;h of corrosion, while the mass loss of the bare substrate had reached to 6.34&#xa0;mg/cm<sup>2</sup>. Internal oxidation occurred on the bare alloy, which a loose feather-like NiCr<sub>2</sub>O<sub>4</sub> with sporadic Ni<sub>3</sub>Fe particles failed to separate the alloy matrix from corrosive medium attacking. A series of silicate products (SiO<sub>2</sub>-Li<sub>2</sub>SiO<sub>3</sub>-Ca<sub>2</sub>SiO<sub>4</sub>) were formed on enamel coating, which effectively blocks the diffusion of chloride salt.</p>

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Corrosion Behavior of GH3535 Alloy and Its Enamel Coating in KCl-LiCl Gas at 550 °C

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Zhongdi Yu,
  • Chaochao Wang,
  • Jumei Zhang,
  • Jinping Wu

摘要

The GH3535 alloy as a candidate material for molten salt metallurgy suffered serious corrosion that threatened the safety of nuclear facility. An amorphous enamel coating based on SiO2-B2O3-Na2O-CaO was designed to protect GH3535 alloy in molten LiCl-KCl salt vapor atmosphere at 550 °C. Under the protection of this coating, its mass gain was merely 0.31 mg/cm2 after 300 h of corrosion, while the mass loss of the bare substrate had reached to 6.34 mg/cm2. Internal oxidation occurred on the bare alloy, which a loose feather-like NiCr2O4 with sporadic Ni3Fe particles failed to separate the alloy matrix from corrosive medium attacking. A series of silicate products (SiO2-Li2SiO3-Ca2SiO4) were formed on enamel coating, which effectively blocks the diffusion of chloride salt.