1. The higher the purity, the better the corrosion resistance. It is well known that pure aluminium in the air and oxygen attack effect, on the surface of aluminium will produce a very thin layer of dense natural oxide film, faster and thicker than other metal oxide film, thus preventing harmful gas and water corrosion in the air, playing a maintenance effect.
2. The corrosion resistance of pure aluminium is good, but its mechanical strength is poor, which restricts the use of aluminium to a certain extent. Therefore, people add appropriate amounts of magnesium, copper, zinc and other metals into aluminium to make various types of aluminium alloys.
Aluminum alloy has high mechanical strength, which greatly improves its mechanical strength and enlarges its use. Aluminum alloy has high mechanical strength, but its corrosion resistance is worse than pure aluminum, so it may be corroded by oxidation.
This requires the maintenance of aluminium alloy profiles by powder coating. Aluminum alloy has been widely used in doors, windows and curtain walls of buildings for many years because of its small proportion, easy processing and high mechanical strength. ,
Through powder coating, aluminium profiles have many advantages, such as high corrosion resistance, diversified colors, good surface texture and so on. It corresponds to different exterior wall coatings to build colorful construction.