(1) Surface preparation treatment: the surface of the profile is cleaned in the way of organic chemistry or physics, and the pure matrix is exposed to facilitate the detailed and high density human oxide film. It can also obtain mirror glass or no light (matte) surface according to mechanical equipment.

        (2) Anodic oxidation: after surface preparation treatment of the profile, 2020 aluminum profile in a certain technical standard, the substrate surface anodic oxidation, transformed into a layer of high density, porous structure, strong adsorption AL203 film layer.

        (3) Hole sealing: the porosity of the porous structure of the oxide film formed after anodic oxidation is closed, so as to improve the pollution treatment, corrosion resistance and wear resistance of the oxide film. The oxide film is colorless and transparent, using the strong adsorption force of the oxide film before sealing the hole, the aluminum door lock in the membrane hole absorption of some metal salt accumulation, can make the surface of the profile present primary color (silver) many colors, such as: gray black, copper, orange yellow and stainless steel plate color.