There are three stages for aluminum extrusion processes: Casting, extruding and oxidization.
Compounding in the aluminum extrusion press
Calculate specific amount of various alloy and fix various raw materials properly according to the specific alloy grades of the required products.
Smelting the prepared raw material
Put the prepared raw material into the smelting furnace for smelting by following specific requirements of smelting process and eliminate slags and gas from the furnace by degassing and slag removal.
Conduct cool casting to the molten aluminum under certain casting condition through the deep wall system to achieve round casting billets diversified in specifications.
The extruded aluminum profiles feature poor corrosion resistance, in which surface anodizing is required to enhance corrosion resistance, abrasiveness and appearance of the aluminum profiles.
Conducting surface cleaning to the aluminum profiles through chemical or physical approach to make the pure aluminum profile exposed, thus getting complete and compact artificial oxide film, besides, the polished finish of surface can also available by mechanical processing.
The aluminum profiles, after undergoing a surface pretreatment process, can achieve anodizing on its surface under proper process conditions and forming AL203 surface film featuring compact, multi-pore and highly absorptive.
Seal the film pore of anodized porous oxide film to make the film pollution, corrosion and abrasiveness free. The oxide film is colorless and clear, using high absorption of pre-sealed oxide film to absorb and deposit some metal salt within in the film pore, which can give aluminum profiles multiple colors in appearance except fot its original color.