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2010•Surface TechnologyRequires access

Microstructure and Corrosion Behavior of Hot Dipping Ni-based Alloy Coating

Zhimeng Guo

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Abstract

Ni-based alloy coating was prepared by hot dipping on Q235 steel.Before and after corrosion,the phases and the microstructures of the coating were investigated by XRD and SEM-EDS,respectively,and the mechanism of corrosion of the coating was discussed.The results show that there are many forms of the precipitates in the coating.The width of transition zone is 5~8 μm.The corrosion products of the coating are Ni(OH)2,Fe3O4 and Fe+3O(OH).And the average corrosion rate of hot dipped Ni-based alloy is about 1.18×10-7 g/(h·mm2).Due to the different corrosion potentials of the alloy elements and the non-homogeneous structures,the corrosion is characterized of local corrosion,which first occurres around pores and the borders of precipitates.

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What this paper is about

Ni-based alloy coating was prepared by hot dipping on Q235 steel.Before and after corrosion,the phases and the microstructures of the coating were investigated by XRD and SEM-EDS,respectively,and the mechanism of corrosion of the coating was discussed.The results show that there are many forms of the precipitates in the coating.The width of transition zone is 5~8 μm.The corrosion products of the coating are Ni(OH)2,Fe3O4 and Fe+3O(OH).And the average corrosion rate of hot dipped Ni-based alloy is about 1.18×10-7 g/(h·mm2).Due to the different corrosion potentials of the alloy elements and the non-homogeneous structures,the corrosion is characterized of local corrosion,which first occurres around pores and the borders of precipitates.

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Available abstract

Ni-based alloy coating was prepared by hot dipping on Q235 steel.Before and after corrosion,the phases and the microstructures of the coating were investigated by XRD and SEM-EDS,respectively,and the mechanism of corrosion of the coating was discussed.The results show that there are many forms of the precipitates in the coating.The width of transition zone is 5~8 μm.The corrosion products of the coating are Ni(OH)2,Fe3O4 and Fe+3O(OH).And the average corrosion rate of hot dipped Ni-based alloy is about 1.18×10-7 g/(h·mm2).Due to the different corrosion potentials of the alloy elements and the non-homogeneous structures,the corrosion is characterized of local corrosion,which first occurres around pores and the borders of precipitates.

Key concepts: Corrosion, Materials science, Coating, Microstructure, Alloy, Metallurgy, Homogeneous, Composite material

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