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Hot Corrosion Behaviour of NiCrAlY Coating by Arc Ion Plating at 900

Zhu De-gang

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Abstract

Ni28Cr11Al0.5Y coating was deposited on Ni-base single crystal superalloy substrate by arc ion plating.The corrosion behaviors of the superalloy with Ni28Cr11Al0.5Y coating and the superalloy in molten 75%Na2SO4+25%K2SO4at 900 ℃ were studied.The results indicate that the superalloy suffered catastrophic hot corrosion,and serious internal oxidation and internal sulfidation appeared;the coating protected the superalloy from hot corrosion destruction and improved the hot corrosion resistance of the superalloy due to the formation of a continuous and dense Al2O3scale.

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What this paper is about

Ni28Cr11Al0.5Y coating was deposited on Ni-base single crystal superalloy substrate by arc ion plating.The corrosion behaviors of the superalloy with Ni28Cr11Al0.5Y coating and the superalloy in molten 75%Na2SO4+25%K2SO4at 900 ℃ were studied.The results indicate that the superalloy suffered catastrophic hot corrosion,and serious internal oxidation and internal sulfidation appeared;the coating protected the superalloy from hot corrosion destruction and improved the hot corrosion resistance of the superalloy due to the formation of a continuous and dense Al2O3scale.

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Available abstract

Ni28Cr11Al0.5Y coating was deposited on Ni-base single crystal superalloy substrate by arc ion plating.The corrosion behaviors of the superalloy with Ni28Cr11Al0.5Y coating and the superalloy in molten 75%Na2SO4+25%K2SO4at 900 ℃ were studied.The results indicate that the superalloy suffered catastrophic hot corrosion,and serious internal oxidation and internal sulfidation appeared;the coating protected the superalloy from hot corrosion destruction and improved the hot corrosion resistance of the superalloy due to the formation of a continuous and dense Al2O3scale.

Key concepts: Superalloy, Materials science, Metallurgy, Corrosion, Coating, Ion plating, Sulfidation, High-temperature corrosion

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