Aluminum with its proportion is small, easy processing, high mechanical strength and other characteristics over the years is widely used in building doors and windows, curtain wall and other products. Aluminum is a silvery sheen of active light metal, its corrosion resistance has the following two features:

The higher the purity, better corrosion resistance, mainly because of pure aluminum in the air and oxygen generating function, in the aluminum surface to produce a thin layer of dense natural oxide film, metal oxide film formation than other fast and thick, and prevent the harmful gases in air and water further corrosion, plays a protective role;

Aluminum with high mechanical strength, but the corrosion resistance. Pure aluminum corrosion resistance is good, but the poor mechanical strength, this was restricted on certain level of aluminum application, therefore, the people in the aluminum adding magnesium, copper, zinc and other metal, made of various types of aluminum alloy, aluminum mechanical strength greatly enhanced, scope of application is greatly enlarged, but the corrosion resistance than the pure aluminum is poor, thus possibly due to oxidation and corrosion. This needs to carry on powder coating on aluminum alloy profile is protected.

After the powder coating of aluminum with high corrosion resistance, but also has various colors, surface texture and many other advantages, and various colors of paint of the wall outside the building echoes, to adapt to different building style.