| 摘要 |
PROBLEM TO BE SOLVED: To enhance the productivity by eliminating intermediate annealing treatment and employing electroless etching in manufacturing an aluminum foil for electrolytic capacitor electrode. SOLUTION: The aluminum foil contains 10-30 ppm of Si, 5-30 ppm of Fe, 21-150 ppm of Ni, 0.1-3 ppm of Pb, less than 10 ppm of Cu, and Al and unavoidable impurities for 99.9% or above of the remaining portion. The aluminum foil is rolled to a thickness of 80-150μm by hot rolling at a processing rate of 95.0-99.8% and cold rolling at a processing rate of 90% or above without annealing during rolling. This aluminum foil is annealed for an hour or more at 530-580°C in an inactive gas and/or reducing gas atmosphere at a heat-up speed of 20-70°C/hour, which results in a high cubic crystal rate and an Al-Ni-based deposit having 0.1-5μm in diameter and 0.05-1μm in thickness dispersed in the lateral direction at a concentration of 0.1×10<SP>6</SP>-3.0×10<SP>6</SP>/cm<SP>2</SP>in a surface portion of the base material. COPYRIGHT: (C)2008,JPO&INPIT
|
