The electroless plating Ni–P is prepared on the surface of Mg–7.5Li–2Zn–1Y alloys with different pickling processes.The microstructure and properties of Ni–P coating are investigated.The results show that the Ni–P coatings deposited using the different pickling processes have a different high phosphorus content amorphous Ni–P solid solution structure,and the Ni–P coatings exhibit higher hardness.There is higher phosphorus content of Ni–P amorphous coating using 125 g/L Cr O3and 110 ml/L HNO3(w68%)than using 180 g/L Cr O3and 1 g/L KF during pre-treatment,and the coating structure is more compact,and the Ni–P coatings exhibit more excellent adhesion with substrate(Fcup to22 N).The corrosion potential of Ni–P coating is improved and exhibits good corrosion resistance.As a result,Mg-7.5Li-2Zn-1Y alloy is remarkably protected by the Ni–P coating. The electroless plating of Ni-P is prepared on the surface of Mg-7.5Li-2Zn-1Y alloys with different pickling processes. The microstructure and properties of Ni-P coating are investigated. The results show that the Ni-P coatings deposited using the The different pickling processes have a different high phosphorus content Ni-P solid solution structure, and the Ni-P coatings exhibit higher hardness.There is a higher phosphorus content of Ni-P amorphous coating using 125 g / L Cr O3 and 110 ml / L HNO3 (w68%) than using 180 g / L Cr O3 and 1 g / L KF during pre-treatment, and the coating structure is more compact, and the Ni-P coatings exhibit more excellent adhesion with substrate (Fcup to22 N) .corrosion potential of Ni-P coating is improved and exhibits good corrosion resistance. As a result, Mg-7.5Li-2Zn-1Y alloy is remarkably protected by the Ni-P coating.