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<p>A NiCrAlY/NiAlHfY composite coating was deposited on a Ni-based superalloy substrate by arc ion plating (AIP) technology. Hot corrosion testing was conducted on the coatings and substrate coated with 75 wt% Na<sub>2</sub>SO<sub>4</sub> and 25 wt% NaCl mixed salt at 900 °C. The result demonstrated that average depths of corrosion were observed to be 45&#xa0;μm and 375&#xa0;μm, respectively. Therefore, it can be concluded that the NiCrAlY/NiAlHfY coatings provide a certain corrosion resistance for the substrate. The underlying mechanism was that the Cr<sub>2</sub>O<sub>3</sub>/Al<sub>2</sub>O<sub>3</sub> double oxide layer prevented the internal diffusion of corrosive ions. The thermodynamic results indicated that the Y and Cr elements could capture and pin S, which further hindered the internal diffusion of S. Additionally, the NiAlHfY layer provided an adequate amount of Al for the NiCrAlY layer, ensuring Al<sub>2</sub>O<sub>3</sub> layer formation on the coatings surface and reducing the diffusion channels of corrosive ions. The results demonstrate that the NiCrAlY/NiAlHfY coatings exhibit a certain extent corrosion resistance when employed on superalloy substrate.</p>

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Effect and corrosion mechanism of NiCrAlY/NiAlHfY composite coatings exposed to Na2SO4 and NaCl mixed molten salt

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • Xiaoya Li,
  • Hongzhi Yang,
  • Caifeng Zheng,
  • Songsheng Lin,
  • Yifan Su,
  • Jianpeng Zou,
  • Qian Shi,
  • Mingjiang Dai,
  • Kesong Zhou

摘要

A NiCrAlY/NiAlHfY composite coating was deposited on a Ni-based superalloy substrate by arc ion plating (AIP) technology. Hot corrosion testing was conducted on the coatings and substrate coated with 75 wt% Na2SO4 and 25 wt% NaCl mixed salt at 900 °C. The result demonstrated that average depths of corrosion were observed to be 45 μm and 375 μm, respectively. Therefore, it can be concluded that the NiCrAlY/NiAlHfY coatings provide a certain corrosion resistance for the substrate. The underlying mechanism was that the Cr2O3/Al2O3 double oxide layer prevented the internal diffusion of corrosive ions. The thermodynamic results indicated that the Y and Cr elements could capture and pin S, which further hindered the internal diffusion of S. Additionally, the NiAlHfY layer provided an adequate amount of Al for the NiCrAlY layer, ensuring Al2O3 layer formation on the coatings surface and reducing the diffusion channels of corrosive ions. The results demonstrate that the NiCrAlY/NiAlHfY coatings exhibit a certain extent corrosion resistance when employed on superalloy substrate.