The invention relates to a biomedical
magnesium alloy with dual
corrosion resistance and a preparation method thereof. The biomedical
magnesium alloy with the dual
corrosion resistance is composed ofa biological
magnesium alloy matrix, inner layer
graphene and outer layer stannic
oxide, wherein the inner layer
graphene and the outer layer stannic
oxide are evenly distributed on a magnesium alloycrystal boundary, dual resistance is provided through the two-layer structure of
graphene and stannic
oxide, and thus the degradation resistance of the
magnesium alloy is improved. The preparation method comprises the steps that firstly,
magnesium alloy powder is soaked in an NaOH solution for
etching, so that electronegative hydroxyl is formed on the particle surface; then the
powder is soaked ina PDDA solution so that the particle surface can be electropositive; then the
powder is soaked in a graphene oxide solution to obtain a PDDA-graphene oxide wrapping layer, and then the powder is soaked in an alkalescent stannic
chloride aqueous solution, so that
magnesium alloy powder wrapped with a graphene-stannic oxide two-layer structure is obtained; and finally, under a protective
atmosphere, the biomedical magnesium alloy with excellent
corrosion resistance is prepared through
selective laser melting. According to the biomedical magnesium alloy with the dual corrosion resistance and thepreparation method thereof, magnesium alloy grains are wrapped with the graphene-stannic oxide two-layer structure so that a two-layer protection shield can be achieved to isolate contact between themagnesium alloy and a corroding medium, and the corrosion resistance is improved.