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The main alloying elements in the commonly used rustproof aluminum alloy are manganese and magnesium, adding manganese can improve its corrosion resistance, adding magnesium makes it strengthen and reduce the specific gravity, its characteristics are corrosion resistance, good polishability, can keep the bright surface for a long time, the strength is higher than pure aluminum, mostly used in the manufacture of parts in contact with liquid, pipes, daily necessities, decorations, etc.; hard aluminum, also called duralumin, is an alloy of aluminum, copper and magnesium, and contains a small amount of manganese. Copper and magnesium are more soluble in aluminum and have a strengthening effect, and manganese makes it corrosion resistant. Hard aluminum according to its different alloy element content can be manufactured respectively rivets, aircraft propellers and aircraft high-strength parts; super hard aluminum is hard aluminum containing zinc, its hardness and strength are higher than..