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<p>This study investigates hot corrosion resistance in gas turbine components under molten sulfate-chloride environments, alongside the challenge of nickel resource scarcity in remanufacturing. A nitrogen-containing nickel-based alloy powder was designed and deposited via plasma cladding onto an Inconel 625 substrate, and its performance was compared with a standard Inconel 625 cladding. Through hot corrosion tests in Na<sub>2</sub>SO<sub>4</sub> + NaCl salt at 600-800&#xa0;°C, along with microstructural and compositional analyses, the N-containing cladding demonstrated significantly better corrosion resistance than Inconel 625, showing lower mass loss and corrosion rates. The improvement is attributed to nitrogen promoting a denser and more continuous Cr<sub>2</sub>O<sub>3</sub> layer, inhibiting sulfur and chlorine penetration, and aiding the formation of an inner Al<sub>2</sub>O<sub>3</sub> film at higher temperatures. This work offers a material design strategy for cost-effective, high-performance remanufacturing of turbine hot-section components.</p>

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Study on the Hot Corrosion Resistance of Nitrogen-Containing Nickel-Based Cladding Layer in Na2SO4 + NaCl

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Lilan Li,
  • Chengjie Wei,
  • Zhixin Yang

摘要

This study investigates hot corrosion resistance in gas turbine components under molten sulfate-chloride environments, alongside the challenge of nickel resource scarcity in remanufacturing. A nitrogen-containing nickel-based alloy powder was designed and deposited via plasma cladding onto an Inconel 625 substrate, and its performance was compared with a standard Inconel 625 cladding. Through hot corrosion tests in Na2SO4 + NaCl salt at 600-800 °C, along with microstructural and compositional analyses, the N-containing cladding demonstrated significantly better corrosion resistance than Inconel 625, showing lower mass loss and corrosion rates. The improvement is attributed to nitrogen promoting a denser and more continuous Cr2O3 layer, inhibiting sulfur and chlorine penetration, and aiding the formation of an inner Al2O3 film at higher temperatures. This work offers a material design strategy for cost-effective, high-performance remanufacturing of turbine hot-section components.