The surface of aluminum alloy after anodic oxidation process is not smooth, which may be caused by the high content of nitric acid in the tank liquid, acid and alkaline corrosion. There may also be defects in the internal mechanism of aluminum causing the surface is not smooth        

        If the copper content in the bath is also high, the surface of the industrial aluminum profile finishing factory will be more serious. Usually, if the nitric acid content in the tank is too high, the anodic oxidation process reflects strongly, resulting in "boiling" condition. If the nitric acid content is normal and the copper content is high, there is a layer of characteristic color of copper on the surface of the aluminum material adhered to after water cleaning. If the characteristic color of copper is very dark, the copper content in the surface bath is high, and some effective measures should be taken to adjust the content of nitric acid and copper to the conventional range. If the aluminum profile processing additive copper content, as little as possible; If the copper in the tank solution comes from the anodic oxidation process of copper aluminum material, some effective measures should be taken to add non-copper additives or adjust the tank solution.