Zinc-based multi-element alloy for hot dipping and preparation method thereof

The invention provides a zinc-based multi-element alloy for hot dipping and a preparation method thereof. The zinc-based multi-element alloy comprises the following components in percentage by mass: 2 to 3 percent of Al, 0.1 to 0.2 percent of RE(LA, Ce and PR mixed rare earth), 0.02 to 0.03 percent of Ni, 0.01 to 0.02 percent of Si, 0.01 to 0.02 percent of Mg, 0.005 to 0.01 percent of Cu and the balance of Zn. The zinc-based multi-element alloy has the advantages that: (1) in the alloy, the Al, Ni, Si, Cu and other elements are reasonably mixed, so the corrosion resistance of a hot-dip coating is obviously improved by over 20 percent than that of a pure zinc coating, meanwhile, the aluminium content is controlled within 3 percent so as to ensure that the alloy has good dip plating performance; and (2) in the alloy, La, Ce, Pr and other rare-earth elements and Mg element are reasonably mixed, so the fluidity and wetting performance of alloy plating solution are further improved, the surface quality of the coating is good, and the metal consumption is reduced by over 20 percent than that of the traditional galvanization. The zinc-based multi-element alloy and the preparation method thereof have obvious advantages in the aspects such as improving performance quality of hot-dip galvanized products, reducing metal consumption and reducing production cost.