Aluminum magnesium alloy and surface modifying method thereof

The invention relates to the technical field of metal alloy, in particular to an aluminum magnesium alloy and a surface modifying method thereof. The aluminum magnesium alloy is prepared from aluminum, manganese, titanium, chromium, magnesium, iron and rare earth metals. The surface modifying method of the aluminum magnesium alloy comprises the steps that the aluminum magnesium alloy is polished and cleaned with acetone till the surface is clean; an electric arc spraying method is adopted to form a silicon substrate coating and a chromium-aluminum coating on a base body; a magnetron sputtering coating method is adopted to form a titanium metal layer, the electric arc spraying method is adopted to form an inorganic silicon layer, and finally the alloy is coated with a protective layer. The aluminum magnesium alloy obtained by adopting the surface modifying method has the good anti-explosion and electromagnetic shielding effects, and also has the advantages of being resistant to corrosion and high temperature and high in comprehensive chemical property.