Single-phase Si-modified β-NiAl coatings with molten Na2SO4+NaCl salts-induced corrosion behavior at 700 and 900 °C

doi:10.1016/j.jmst.2025.02.084

Abstract

Abstract: Single-phase Si modified β-NiAl coatings with Si contents of 1.5 at.%, 2.0 at.%, and 2.7 at.% were prepared using Al-Si plasma irradiation, which are distinctively different from that of the conventional AlSi slurry-diffusion process that normally generates silicides precipitation. Their corrosion behavior under Na₂SO₄+NaCl salt mixture deposits at 700 and 900 °C were investigated. Increasing the Si concentration from 1.5 at.% to 2.7 at.% improved the hot corrosion resistance of the β-NiAl coatings significantly. Si forms α-SiO₂ nano-particles within the oxide scale and promotes α-Al₂O₃ formation at the initially, and thus inhibits basic fluxing. HRTEM analysis showed that S was captured in some SiO₂ particles, so its inward migration was slow down. Inside the coating, Mo is pinned by Si-rich particles in the interdiffusion zone, preventing acidic fluxing.

Key words: Si-modification, NiAl, Hot corrosion, α-Al₂O₃, SiO₂, Molten salt

Wei Wang, Xiaojing Wang, Yuesui Lei, Zejie Li, Yuxian Cheng, Mingli Shen, Shenglong Zhu, Fuhui Wang. Single-phase Si-modified β-NiAl coatings with molten Na₂SO₄+NaCl salts-induced corrosion behavior at 700 and 900 °C[J]. J. Mater. Sci. Technol., 2026, 241: 78-92.

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Single-phase Si-modified β-NiAl coatings with molten Na₂SO₄+NaCl salts-induced corrosion behavior at 700 and 900 °C

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