Influences of ZrO_2 Content and Duty Ratio on Microstructure and Corrosion Resistance of Ni-Co-ZrO_2 Composite Coating AITranslate

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Chinese Library Classification Number:TG174.4[金属学及工艺—金属表面处理]

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Ni-Co-ZrO_2 composite coating was successfully fabricated on the substrate of Q235 steel by pulse electro-deposition of nickel sulfate(NiSO4·6H2O),cobalt sulfate(CoSO4·7H2O)and zirconia(ZrO_2)particles.Microstructure and chemical components of the composite coating were analyzed by SEM and EDS,respectively.Moreover,the corrosion resistance of Ni-Co-ZrO_2 composite coating was investigated.The results show that the coating has homogeneous and compact microstructure without defects such as pores and cracks at the interface with the substrate.ZrO_2 particles dispersed in Ni-Co alloy substrate,and the morphology of Ni-Co alloy grains changes from fibril-like shape to cauliflower-like shape with the addition of ZrO_2 particles.The thickness of the coating is about 60μm after 1.5hdeposition,and Ni-Co-ZrO_2 composite coating has crystalline microstructure in the coated state.With the content of ZrO_2 particles increasing and duty ratio decreasing in the coating,Ni-Co alloy grains are refined and the corrosion resistance of the composite coating is significantly improved.The best corrosion resistance is obtained when ZrO_2 content is 20g/L and duty ratio is 40%.