| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing aluminum foil for electrolytic capacitor electrode less prone to cause an unetched part at etching. SOLUTION: Homogenizing treatment is applied to an aluminum ingot having 99.90-99.99% aluminum purity, and then hot rolling is applied at 400-500 deg.C initial hot rolling temperature and <=300 deg.C hot rolling finishing temperature to obtain an aluminum plate. Subsequently, cold rolling is applied to the aluminum plate. Before, in the course of, or after the cold rolling, cleaning treatment is performed by using an alkalescent aqueous solution of <pH 9.5. This cleaning treatment is performed in such a way that the thickness of the aluminum plate or sheet at cleaning is decreased by 0.05-0.1%. After the cold rolling and the cleaning treatment are finished, final annealing is applied in general to obtain the aluminum foil for electrolytic capacitor electrode. Moreover, the aluminum foil can be degreased and cleaned before final annealing.
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