Multi-element microalloyed high-silicon manganese-rich high-corrosion-resistance die-casting aluminum alloy and preparation method thereof

The invention relates to a multi-element microalloyed high-silicon manganese-rich high-corrosion-resistance die-casting aluminum alloy and a preparation method thereof, in particular to an aluminum alloy product which is improved in corrosion resistance and is produced by adopting a die-casting process. Except for extremely excellent corrosion resistance and good mechanical performance, the corrosion-resistant steel plate comprises the following raw materials in percentage by weight: 7.0-13.5% of silicon (Si), less than or equal to 1.0% of iron (Fe), less than or equal to 1.2% of copper (Cu), less than or equal to 1.0% of silicon (Cu), less than or equal to 1.0% of copper (Cu 0.25-2.0% of manganese (Mn), 0.15-1.25% of magnesium (Mg), and less than 0.1% of single impurity element; preferably, the multi-element microalloying is a scientific combination of two or more than two of elements such as La, Ce, Y, Ho, Pr, Eu, Er, Sm, Dy, Zr, Ti and the like, the total content of the multi-element microalloying is 0.05-