| 摘要 |
PROBLEM TO BE SOLVED: To provide aluminum foil in electrolytic capacitor for improving the increasing area ratio by generating deep etching pit uniformly and further enhancing the electrostatic capacity. SOLUTION: This aluminum foil in an electrolytic capacitor electrode has a chemical composition containing Al of purity not less than 99.96%, Si: 2 to 20 ppm, Fe:2 to 15 ppm, and Cu: 20 to 200 ppm, and also at least one kind from among Ti Zr, and V is not less than 26 ppm, and the total thereof is 26 to 100 ppm. Then, content of B is limited to 3 ppm or lower, and the rest is made of Al and impurity. Average grain size is not more than 300μm, the area of crystal grain with a difference of orientation from cubic orientation of 100} <100> which is not lager 10 deg. occupies not less than 75%.
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