Mg alloys as one of the lightest structural metals ，It's 75% lighter than steel, 33% lighter than aluminum. it has become one of the main directions to use low-density magnesium alloy materials for the future development of automotive materials

Electroless Ni plating on Mg alloy, it can enhance the corrosion resistance and wear resistance of the product. it is one of the most common and economical surface treatments for Magnesium alloy nowadays.

AZ91D is an excellent light weight and high strength material,it has the advantages of low density，high specific strength, good heat dispersion, mechanical properties and electromagnetic shielding etc, however, the poor corrosion resistance seriously limits its wide application. electroless Ni plating is one of the most common and economical surface treatments for AZ91D ,because electroless nickel plating can form a uniform thickness coating, it has good corrosion and wear resistance.

Magnesium (Mg) and its alloys are being used as structural components in industries because of their high strength-to-weight ratio and relatively high stiffness. A shortcoming of Mg alloys is poor corrosion and wear resistance that have hindered its widespread applications.