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<p>To further investigate the corrosion behavior of titanium alloys at high temperatures, this study successfully utilized Electron Beam Freeform Fabrication (EBF) technology to fabricate a near-α type TA1/TC4 titanium alloy. The alloy was immersed in mixed salt solutions (NaCl + Na₂SO₄) of varying concentrations and forms, and subjected to a molten salt corrosion test at 750&#xa0;°C for 50&#xa0;h to explore the corrosion mechanisms of this alloy. The experimental results indicate that the chloride (Cl⁻) and sulfate (SO₄²⁻) ion concentrations in the mixed salt solution significantly affect the sulfur-chlorine cycle reactions during corrosion. Observations of the affected layer depth revealed that, in a molten salt environment, the titanium alloy tends to form a loose, non-protective TiO₂ layer, accompanied by the formation of sulfides such as TiS₂. Additionally, Cl⁻ ions promote the generation of volatile TiCl₄. Consequently, the corrosion-affected layer under high-concentration salt solutions is significantly enhanced.</p>

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Thermal corrosion behavior of TA1/TC4 titanium alloy fabricated by electron beam dual-wire additive manufacturing in a mixed salt of NaCl and Na₂SO₄

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Pengfei Li,
  • Jiacheng Wu,
  • Yiming Shen,
  • Sailan Wang,
  • Jingjing Zhang,
  • Liping Liu,
  • Yuchun Peng,
  • Yongbing Chen

摘要

To further investigate the corrosion behavior of titanium alloys at high temperatures, this study successfully utilized Electron Beam Freeform Fabrication (EBF) technology to fabricate a near-α type TA1/TC4 titanium alloy. The alloy was immersed in mixed salt solutions (NaCl + Na₂SO₄) of varying concentrations and forms, and subjected to a molten salt corrosion test at 750 °C for 50 h to explore the corrosion mechanisms of this alloy. The experimental results indicate that the chloride (Cl⁻) and sulfate (SO₄²⁻) ion concentrations in the mixed salt solution significantly affect the sulfur-chlorine cycle reactions during corrosion. Observations of the affected layer depth revealed that, in a molten salt environment, the titanium alloy tends to form a loose, non-protective TiO₂ layer, accompanied by the formation of sulfides such as TiS₂. Additionally, Cl⁻ ions promote the generation of volatile TiCl₄. Consequently, the corrosion-affected layer under high-concentration salt solutions is significantly enhanced.