Patent ID: 6358391
Filing Date: 2002-03-19
Classification: C25D,H01G

Abstract:
A method for making an anode foil for an aluminum electrolytic capacitor comprising:a first anodizing step of forming a first anodized film on a surface of an aluminum foil, an immersion treatment step of immersing the aluminum foil after said first anodizing step in an aqueous solution containing an alkaline metal compound, a current feeding step of feeding an electric current to the aluminum foil after said immersion treatment step in a current feeding solution in a current feeding cell disposing a current feeding electrode connected to an anode of a direct-current power source, to expose defects included in the first anodized film, and a second anodizing step of restoring the defects and forming a second anodized film on a surface of the aluminum foil after said current feeding step by applying a higher voltage than a voltage in said first anodizing step.