abstract |
(57) Abstract: An object of the present invention is to provide a method for forming an electrode foil for an aluminum electrolytic capacitor, which can increase the capacitance and reduce the leakage current. SOLUTION: A first chemical conversion tank 1 containing an adipic acid-based chemical solution, a second chemical conversion tank 2 containing a boric acid-based chemical solution, and a third chemical conversion tank 3 containing a phosphoric acid-based chemical solution in this order. At least one or more of these three formation tanks 1, 2 and 3 are arranged as one combination, and the aluminum electrode foil etched by these formation tanks 1, 2 and 3 is formed, and one combination is formed. The three formation tanks 1, 2 and 3 are adapted to apply the same formation voltage. |