Title:
ALUMINUM ELECTRODE PLATE FOR ELECTROLYTIC CAPACITOR
Document Type and Number:
WIPO Patent Application WO/2008/035454
Kind Code:
A1
Abstract:
This invention provides an aluminum electrode plate for an electrolytic capacitor, which, even when the thickness of an etching layer is large, can realize a high level of impregnation of a solid electrolyte and can reduce ESR of a capacitor. An aluminum plate having an aluminum purity of not less than 99.98% by mass is etched to form an etching layer having a depth of 70 μm or above. When a plane cross section of a position deeper than 20 μm from the surface in the etching layer is measured with an image analyzer, for each measured face, not less than 70% of the total number of pits within the measured face is accounted for by pits having a diameter of 0.01 to 1 μmφ in terms of equivalent circle diameter. The aluminum plate has an aluminum purity of not less than 99.98% by mass and comprises 5 to 50 ppm of Fe and 5 to 40 ppm of Cu with the balance consisting of inevitable impurities. The aluminum plate further contains 1 Œ 107 to1010/cm3 iron-containing intermetallic compound having a particle diameter of 0.1 to 1.0 μmφ in terms of spheres.
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Inventors:
KATANO MASAHIKO (JP)
ISOBE MASASHI (JP)
YOSHIDA YUYA (JP)
ISOBE MASASHI (JP)
YOSHIDA YUYA (JP)
Application Number:
PCT/JP2007/000901
Publication Date:
March 27, 2008
Filing Date:
August 24, 2007
Export Citation:
Assignee:
NIPPON LIGHT METAL CO (JP)
KATANO MASAHIKO (JP)
ISOBE MASASHI (JP)
YOSHIDA YUYA (JP)
KATANO MASAHIKO (JP)
ISOBE MASASHI (JP)
YOSHIDA YUYA (JP)
International Classes:
H01G9/04; H01G9/042
Foreign References:
| JP2004319795A | 2004-11-11 | |||
| JP2005264288A | 2005-09-29 | |||
| JPH0971832A | 1997-03-18 |
Attorney, Agent or Firm:
YOKOZAWA, Shiro (Shimadachi Matsumoto-sh, Nagano 52, JP)
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