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

        If the copper content in the tank is also high, the unsmooth surface will be more serious. Usually, 6005A aluminum profile if the nitric acid content in the bath is too high, the anodic oxidation process reflects strongly, there is a "boiling" condition. If the content of nitric acid is normal and the content of copper is high, there is a layer of characteristic color of copper on the surface of the aluminum profile 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 content contains copper, add as little as possible; If the copper in the tank comes from the anodic oxidation process of copper aluminum profiles, some effective measures should be taken to add non-copper additives or adjust the tank liquid.