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<p>A new Pt-modified NiSiAlY coating was prepared in this study. Oxidation and hot corrosion behaviors were investigated at 750 ℃. The coating exhibited good resistance against oxidation, attributed to the formation of a dense and continuous Al₂O₃ scale. Pt could promote the selective oxidation of Al by increasing the Al/Ni ratio and suppressing the formation of NiO. During the hot corrosion, the coating caused more intense attack when exposed to NaCl. NaCl could cause oxychlorination reaction in the initial stage, leading to cyclic corrosion. The corrosion mechanism, including the role of NaCl in initiating and accelerating degradation, was discussed, providing insights into performance of the Pt-modified NiSiAlY coating in harsh environments.</p>

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The oxidation and hot corrosion behaviors of the Pt-modified NiSiAlY coating at 750 ℃

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Miao Yu,
  • Bing Zhu,
  • Fangming Wang,
  • Shoufeng Wang,
  • Shichao Du,
  • Kai Xu

摘要

A new Pt-modified NiSiAlY coating was prepared in this study. Oxidation and hot corrosion behaviors were investigated at 750 ℃. The coating exhibited good resistance against oxidation, attributed to the formation of a dense and continuous Al₂O₃ scale. Pt could promote the selective oxidation of Al by increasing the Al/Ni ratio and suppressing the formation of NiO. During the hot corrosion, the coating caused more intense attack when exposed to NaCl. NaCl could cause oxychlorination reaction in the initial stage, leading to cyclic corrosion. The corrosion mechanism, including the role of NaCl in initiating and accelerating degradation, was discussed, providing insights into performance of the Pt-modified NiSiAlY coating in harsh environments.