METHOD FOR ELIMINATING ALUMINUM OXIDE FILM ON ALUMINUM SURFACE AND METHOD FOR REGENERATING ALUMIMUM OXIDE FILM INCLUDING THE SAME

摘要

The present invention relates to a method for removing an aluminum oxide film without damaging an aluminum (Al) base material from an anodized aluminum (Al) surface and to a method for regenerating an aluminum oxide film including the same. The method for removing an aluminum oxide film comprises a heating step of heating anodized aluminum having an aluminum (Al) base material and an aluminum oxide (Al2O3) film formed thereon to weaken bonding force between the aluminum base material and the aluminum oxide film; an ultrasonic forcing step of immersing the anodized aluminum in water after the heating step and applying shock by ultrasonic vibration; a first film removal step of immersing the anodized aluminum in an alkali solution after the ultrasonic forcing step and melting the aluminum oxide film to be removed; and a second film removal step of immersing the anodized aluminum in a heavy metal acid solution after the first film removal step to further remove the remaining aluminum oxide film from the surface of the aluminum base material.