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HOT CORROSION BEHAVIOR OF AN Al-Si COATING IN PRESENCE OF MOLTEN SULFATE FILM AT 900℃

Xin Ren

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Abstract

An Al-Si diffusion coating was prepared on a nickel-base cast superalloy by slurry aluminizing.The hot corrosion behavior of the cast alloy without and with Al-Si coating was examined in the presence of 75mass%Na_2SO_4+25mass%K_2SO_4 film at 900℃.The cast alloy suffered from catastrophic hot corrosion and serious internal oxidation and sulfidation.Because of the formation of protective Al_2O_3 scale,the beneficial effect of Cr element and some Si-rich phases in the coating,Al-Si coating had excellent resistance to hot corrosion.

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What this paper is about

An Al-Si diffusion coating was prepared on a nickel-base cast superalloy by slurry aluminizing.The hot corrosion behavior of the cast alloy without and with Al-Si coating was examined in the presence of 75mass%Na_2SO_4+25mass%K_2SO_4 film at 900℃.The cast alloy suffered from catastrophic hot corrosion and serious internal oxidation and sulfidation.Because of the formation of protective Al_2O_3 scale,the beneficial effect of Cr element and some Si-rich phases in the coating,Al-Si coating had excellent resistance to hot corrosion.

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Available abstract

An Al-Si diffusion coating was prepared on a nickel-base cast superalloy by slurry aluminizing.The hot corrosion behavior of the cast alloy without and with Al-Si coating was examined in the presence of 75mass%Na_2SO_4+25mass%K_2SO_4 film at 900℃.The cast alloy suffered from catastrophic hot corrosion and serious internal oxidation and sulfidation.Because of the formation of protective Al_2O_3 scale,the beneficial effect of Cr element and some Si-rich phases in the coating,Al-Si coating had excellent resistance to hot corrosion.

Key concepts: Materials science, Corrosion, Sulfidation, Superalloy, Metallurgy, Coating, Alloy, Slurry

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HOT CORROSION BEHAVIOR OF AN Al-Si COATING IN PRESENCE OF MOLTEN SULFATE FILM AT 900℃ — Research Paper | ScholarLens