Semi-solid die-casting and difluorination combined manufacturing method for magnesium alloy building formwork

The invention discloses a semi-solid die-casting and difluorination combined manufacturing method for a magnesium alloy building formwork. The method comprises the following steps that firstly, a magnesium alloy building formwork is prepared through a semi-solid die-casting method; and secondly, the magnesium alloy building formwork prepared in the first step is immersed in a difluorination treatment solution for difluorination combined treatment to obtain the magnesium alloy building formwork subjected to difluorination combined treatment. The magnesium alloy formwork manufactured by the method has a flat and defect-free surface, high tensile strength, large elongation, high surface hardness, a small friction coefficient and excellent scratch resistance and hydrophobicity, and can effectively reduce friction damage caused by concrete aggregate and corrosion damage caused by external corrosive media, prevent chemical reaction and physical adsorption caused by cement, and guarantee theconstruction quality and