Aluminum foil and a manufacturing method thereof for electrolytic capacitor electrode, method of manufacturing electrolytic capacitor electrode material, electrode material and an aluminum electrolytic capacitor for aluminum electrolytic capacitor

摘要

PROBLEM TO BE SOLVED: To provide aluminum material for an electrolytic capacitor electrode in which (100) orientation density of a high level and uniformization of distribution density of etching pits in a high purity aluminum material coil are achieved, thereby the local generation of unetched parts elongating in a rolling direction which has sometimes occurred depending on some DC electrolytic etching conditions is eliminated, and to provide a method for producing the same or the like.;SOLUTION: The aluminum foil for an electrolytic capacitor electrode is produced by subjecting an aluminum ingot having an Al purity of 99.95% to soaking, hot rolling and cold rolling, wherein defects caused by the aluminum oxide found in the foil surface are suppressed to an extremely low frequency. Further, the average value of the (100) orientation density showing the occupancy ratio of cube orientation crystal grains is 98%, and also, the standard deviation thereof is 1%. In this way, high and uniform electrostatic capacitance by etching treatment can be obtained.;COPYRIGHT: (C)2008,JPO&INPIT