| 摘要 |
PROBLEM TO BE SOLVED: To provide hard aluminum foil for electrolytic capacitor electrode for obtaining electrode foil for an electrolytic capacitor having high capacitance. SOLUTION: This foil contains aluminum of >=99.9% purity, Fe, Si and Cu with other inevitable impurities. The average grain size of sub-grains or cells in the aluminum foil is 1 to 10μm. Moreover, the average grain size of the crystal grains having the (100) orientation is 5 to 20μm, and the density thereof is >=400 pieces/mm2. This aluminum foil can suitably be obtained by controlling the cold rolling temp. to 70 to 120 deg.C in the conventional well-known method for producing rolled aluminum foil. Moreover, the foil can suitably be obtained by executing process annealing at 180 to 250 deg.C for 5 to 40 hr after the cold rolling and controlling the draft in the finish cold rolling after the process annealing to 15 to 50%.
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