| 简介 |
PROBLEM TO BE SOLVED : To provide aluminum foil for electrolytic capacitor electrode in which foil thickness can be increased and higher capacitance can be attained and also to provide its manufacturing method.
SOLUTION : When manufacturing the aluminum foil for electrolytic capacitor electrode which has a purity of ≥99.9% and a composition consisting of 5 to 30 ppm Si, 5 to 30 ppm Fe, 10 to 100 ppm Cu, 0.1 to 3 ppm Pb and the balance Al with inevitable impurities and further containing, if necessary, 1 to 20 ppm, in total, of one or more elements among Li, Na, Ca and rare earth elements, and also has 111 to 200μm foil thickness, degassing treatment is performed at casting to regulate a gas value in a casting to ≤0.12 cc/100g and final annealing is carried out at ≥550°C for 6 h. By this method, the aluminum foil for electrolytic capacitor electrode in which cubic crystal rate is made to ≥95% and the area ratio of coarse crystal grains of ≥5 mm circle-equivalent diameter is made to ≤0.01% can be obtained and high capacitance can be attained.
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