| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum foil for electrolytic capacitor anode, hardly causing an etched part at the time of etching. SOLUTION: This aluminum foil for electrolytic capacitor anode contains 5-50 ppm Fe, 6-70 ppm Si, 12-80 ppm Cu, and 0.1-5.0 ppm Pb and (Si content)/(Fe content) and (Cu content)/(Si content) are regulated to 1.1-3.4 and 2.0-4.8, respectively. Aluminum purity is >=99.9%. Such as aluminum foil for electrolytic capacitor anode can be obtained by subjecting the prescribed aluminum ingot to homogenizing treatment, hot rolling, cold rolling, process annealing, finish rolling, and final annealing. Particularly, it is preferable that, as final annealing conditions, holding temperature is regulated to 520-570 deg.C, the total quantity of heat supplied from the beginning of final annealing to its conclusion is regulated to 7.5×103 to 18.0×103 deg.C.h, and the total oxygen concentration in an atmosphere is regulated to <=150 ppm.h.
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