The higher the purity, the better the corrosion resistance. As we all know, pure aluminum reacts with oxygen in the air and produces a thin and dense natural oxide film on the surface of aluminum, which is faster and faster than other metal oxide films. It is much thicker, which prevents the corrosion of harmful gases and moisture in the air and plays a protective role.
Although pure aluminum has good corrosion resistance, it has poor mechanical strength, which restricts the application of aluminum to a certain extent. Therefore, people add appropriate amounts of magnesium, copper, zinc and other metals to aluminum to make various types Alloy thin-walled aluminum pipehas high mechanical strength, which greatly improves the mechanical strength of aluminum and greatly expands its application range. Although alloy thin-walled aluminum tube has high mechanical strength, its corrosion resistance is worse than pure aluminum, so it is possible Corrosion due to oxidation. This requires powder coating to protect the aluminum alloy profile. Aluminum alloy has been widely used in building doors, windows, curtain walls and other products for many years because of its small specific gravity, easy processing, and high mechanical strength.