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Add the nanoscale materials in conventional magnesium alloy flux to absorb the oxide in the melt, And add the surface active agent in the process of preparing fluxes, to prevent reunion of the nano particles. Remove the silicon and iron which have a great influence on the properties of the melt. Form protective gas, Make the melt surface protective layer is foamy, Increasing the contact area between the melt and the flux, Achieve better refining effect, Increase the strength of the magnesium alloy by 4-8%, And elongation increase by 5-10%.