| 摘要 |
PROBLEM TO BE SOLVED: To enable the increase of the capacitance of a capacitor and its miniaturization by improving the surface roughening treating ratio of aluminum foil used for an electrolytic capacitor. SOLUTION: As to the method for producing aluminum foil for an electrolytic capacitor electrode in which aluminum foil is subjected to final annealing and is thereafter subjected to surface roughening treatment, in the temp. rising stage in final annealing, aluminum foil is heated in an oxygen-added reducing atmosphere contg. 0.01 to 1.0% oxygen and 0 to 50% inert gas, and the balance reducing gas, and, subsequently, in a stage including a holding stage, the aluminum foil is heated in an oxygen-nonadded reducing atmosphere contg. 0 to 25% inert gas, and the balance reducing gas and is annealed. Its expansing ratio in surface roughening treatment is improved, the capacitance of an electrolytic capacitor is increased, and its miniaturization is made possible.
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