Aluminum (Al) is a kind of light metal, its compounds are widely distributed in nature, and the resources of aluminum in the crust are about 400 to 50 billion tons, second only to oxygen and silicon, ranking third. In the metal varieties for the first category of metal. Aluminum has special chemical and physical properties, not only light weight, strong texture, but also has good ductility, electrical conductivity, thermal conductivity, heat resistance and nuclear radiation resistance, is an important basic raw material for national economic development.
Aluminum is a very rich metal element on the earth, and its reserves rank first among metals. By the end of the 19th century, aluminum had emerged as a competitive metal in engineering applications and was all the rage. The development of three important industries, aviation, construction and automotive, requires material characteristics with the unique properties of aluminum and its alloys, which greatly facilitates the production and application of this new metal - aluminum.