| 摘要 |
PROBLEM TO BE SOLVED: To realize an increased productivity when manufacturing an aluminum foil for an electrolytic capacitor electrode, by eliminating intermediate annealing. SOLUTION: An aluminum material for an electrolytic capacitor electrode comprises, by mass, 5-40 ppm Si, 5-40 ppm Fe, 0.1-3 ppm Pb, 15-150 ppm Ni and the balance being Al and unavoidable impurities, provided that the amount of Cu contained in the unavoidable impurities is <10 ppm and the total amount of the unavoidable impurities other than Cu is≤100 ppm. The aluminum material is subjected to cold rolling without undergoing any intermediate annealing and subsequently subjected to a final annealing heat treatment to achieve a high cubic crystal rate. A high cubic crystal rate can be achieved at the final annealing, even without performing any intermediate annealing, so that the productivity can be markedly improved without deteriorating the quality. Moreover, a high cubic crystal rate can be achieved over a broad range of thickness of the aluminum foil, just by the final annealing. COPYRIGHT: (C)2008,JPO&INPIT
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