You are a good question. Generally, aluminum profiles need surface treatment after extrusion. Only after surface treatment can they have anti-oxygen and corrosion resistance, because the molecular structure of aluminum is very active and can easily react with oxygen in the air.

Surface treatment of aluminum profile

At present, the surface treatment technology of aluminum profiles is also very mature, mainly including anodizing, electrophoresis, spraying, sandblasting, baking paint and other surface treatment technologies.