Magnesium alloy is a magnesium based alloy with the addition of other elements. It is characterized by: small density (about 1.8g/cm3 magnesium alloy), high specific strength, large elastic modulus, good shock elimination, bearing the impact load capacity than aluminum alloy, organic matter and alkali erosion resistance function is good.

At present the most widely used is magnesium aluminum alloy, followed by magnesium manganese alloy and magnesium zinc zirconium alloy.

Mainly used in aviation, aerospace, transportation, chemical, rocket and other industries. The lightest of the practical metals, magnesium is about two thirds as heavy as aluminum and a quarter as heavy as iron. It is the lightest metal in the practical metal, high strength, high rigidity.

At present, the application parts of magnesium alloy in automobile can be classified into two categories.