| 摘要 |
PROBLEM TO BE SOLVED: To provide a method which can manufacture a high-capacity anode foil for an electrolytic capacitor by controlling a pit generating point uniformly using an inexpensive and simple method in an etching step. SOLUTION: In a method for manufacturing the anode foil for aluminum electrolytic capacitor which has a first etching step of generating a tunnel-like pit in an aluminum foil, and a second etching step for expanding the bore diameter of the pit generated in the first etching step, the method has, before the first etching step, a step of performing a first pretreatment of immersing the aluminum foil in first pretreatment solution containing phosphorous acid and nitric acid, and a second pretreatment of immersing the aluminum foil in an alkaline second pretreatment solution containing metal ion. It is desirable to performing a drying treatment without modification after the second pretreatment. COPYRIGHT: (C)2009,JPO&INPIT
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