The price of aluminium is higher than that of carbon steel, but aluminum does not rust and is easily remelted for recycling, making it one of the most recyclable resources on earth. Excellent characteristics of alu for human use 1-3) mainly embodied in the following several aspects: (1) formability, use of forming and comply with appropriate temperature and time of annealing processing, into a soft metal, suitable for a variety of forming, such as aluminium alloy wheel group, POTS and pans, heat exchanger, LED lamps and lanterns, aluminium capacitor shell, aluminum pot, etc.; (2) high strength, the use of alloying smelting, rolling, and heat treatment, it can process products of different hardness levels, for example, used in capacitor and packaging industry 0.006mm thick aluminumfoil, in 0 state (soft state) tensile strength of about 75MPa; (3) Lightweight, the proportion of aluminium is only one third of that of steel; (4) Corrosion resistance, aluminium surface spontaneously formed in the natural environment dense A10, film can effectively prevent strong oxidizing substances to deep oxidation, good corrosion resistance; If the aluminium surface is roughened by chromic acid and coated with organic high marksSurface technology treatment, the corrosion resistance is stronger, can be used in the harsh environment inside and outside the slaughter;