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INFLUENCE OF THE ROOM-TEMPERATURE CORROSION ONTHE CYCLIC OXIDATION BEHAVIOR OF Al-Si COATINGS

Fubin Song, Qi Zhang

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Abstract

The cyclic oxidation behavior of Al-Si coatings on the Ni-base superalloy DZ125 has been investigated,which has been corroded by room temperature corrosion.The results indicated that the room temperature corrosion decreased the Al content,and increased the surface roughness of the coating.During the subsequent cyclic oxidation,the phase transformation of β NiAl to γ ′ Ni 3Al and the spallation of Al 2O 3 scale are accelerated.As a result,the oxidation resistance and lifetime of the coating are decreased.

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What this paper is about

The cyclic oxidation behavior of Al-Si coatings on the Ni-base superalloy DZ125 has been investigated,which has been corroded by room temperature corrosion.The results indicated that the room temperature corrosion decreased the Al content,and increased the surface roughness of the coating.During the subsequent cyclic oxidation,the phase transformation of β NiAl to γ ′ Ni 3Al and the spallation of Al 2O 3 scale are accelerated.As a result,the oxidation resistance and lifetime of the coating are decreased.

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Available abstract

The cyclic oxidation behavior of Al-Si coatings on the Ni-base superalloy DZ125 has been investigated,which has been corroded by room temperature corrosion.The results indicated that the room temperature corrosion decreased the Al content,and increased the surface roughness of the coating.During the subsequent cyclic oxidation,the phase transformation of β NiAl to γ ′ Ni 3Al and the spallation of Al 2O 3 scale are accelerated.As a result,the oxidation resistance and lifetime of the coating are decreased.

Key concepts: Materials science, Spallation, Corrosion, Coating, Superalloy, Nial, Metallurgy, High-temperature corrosion

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INFLUENCE OF THE ROOM-TEMPERATURE CORROSION ONTHE CYCLIC OXIDATION BEHAVIOR OF Al-Si COATINGS — Research Paper | ScholarLens