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ELECTROLESS Ni-P PLATING ON THE AZ91D MAGNESIUM ALLOY

Jiang Zhonghao

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Abstract

Direct electroless Ni-P plating on the AZ91D magnesium alloy from a plating bath containing sulfate nickel was investigated.The morphology and microstructure of the electroless Ni-P coating was studied by using SEM and XRD.The electroless Ni-P coating was compact and no obvious defects.The hardness values of the Ni-P coatings were about 660 VHN and the phosphorus content of this coating was about 3.72 mass%.The deposition rate of the electroless Ni-P alloy was about 23 μm/h.The acid pickle pretreatment on the AZ91D magnesium alloy substrate provides surface pits to act as sites for mechanical interlocking to improve adhesion of the coating and the substrate.

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What this paper is about

Direct electroless Ni-P plating on the AZ91D magnesium alloy from a plating bath containing sulfate nickel was investigated.The morphology and microstructure of the electroless Ni-P coating was studied by using SEM and XRD.The electroless Ni-P coating was compact and no obvious defects.The hardness values of the Ni-P coatings were about 660 VHN and the phosphorus content of this coating was about 3.72 mass%.The deposition rate of the electroless Ni-P alloy was about 23 μm/h.The acid pickle pretreatment on the AZ91D magnesium alloy substrate provides surface pits to act as sites for mechanical interlocking to improve adhesion of the coating and the substrate.

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Available abstract

Direct electroless Ni-P plating on the AZ91D magnesium alloy from a plating bath containing sulfate nickel was investigated.The morphology and microstructure of the electroless Ni-P coating was studied by using SEM and XRD.The electroless Ni-P coating was compact and no obvious defects.The hardness values of the Ni-P coatings were about 660 VHN and the phosphorus content of this coating was about 3.72 mass%.The deposition rate of the electroless Ni-P alloy was about 23 μm/h.The acid pickle pretreatment on the AZ91D magnesium alloy substrate provides surface pits to act as sites for mechanical interlocking to improve adhesion of the coating and the substrate.

Key concepts: Materials science, Magnesium alloy, Coating, Electroless nickel plating, Metallurgy, Magnesium, Plating (geology), Alloy

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