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<p>TiAl alloys are promising for high-temperature applications but suffer from poor hot corrosion resistance. In this study, a silicon-aluminizing coating and a duplex coating consisting of a silicon-aluminizing inner layer and an yttria-stabilized zirconia (YSZ) top layer were prepared on <i>γ</i>-TiAl alloy. Their hot corrosion behaviors were investigated in Na<sub>2</sub>SO<sub>4</sub> and Na<sub>2</sub>SO<sub>4</sub> + NaCl molten salts at 900&#xa0;°C. The results showed that both coatings significantly reduced the corrosion rate compared to the bare alloy. The addition of NaCl accelerated the degradation of the silicon-aluminizing coating but had limited effect on the duplex coating. The duplex coating exhibited superior performance due to the YSZ layer, which acted as a physical barrier, preventing direct contact between the molten salt and the inner coating, thereby suppressing the dissolution of the protective Al<sub>2</sub>O<sub>3</sub> scale and Al depletion.</p>

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Enhancing Hot Corrosion Resistance of TiAl Alloys by a Duplex Silicon-Aluminizing/YSZ Coating

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Xiaojie Lv,
  • Jiang Huang,
  • Jiqiang Wang

摘要

TiAl alloys are promising for high-temperature applications but suffer from poor hot corrosion resistance. In this study, a silicon-aluminizing coating and a duplex coating consisting of a silicon-aluminizing inner layer and an yttria-stabilized zirconia (YSZ) top layer were prepared on γ-TiAl alloy. Their hot corrosion behaviors were investigated in Na2SO4 and Na2SO4 + NaCl molten salts at 900 °C. The results showed that both coatings significantly reduced the corrosion rate compared to the bare alloy. The addition of NaCl accelerated the degradation of the silicon-aluminizing coating but had limited effect on the duplex coating. The duplex coating exhibited superior performance due to the YSZ layer, which acted as a physical barrier, preventing direct contact between the molten salt and the inner coating, thereby suppressing the dissolution of the protective Al2O3 scale and Al depletion.