Process for producing aluminum electrode plate for electrolytic capacitor

A technology of electrolytic capacitor and manufacturing method, applied in the direction of electrolytic capacitor manufacturing, electrolytic capacitor, capacitor electrode, etc., can solve the problems such as the inability to increase the etching rate and the dissolution of the etched part.

Inactive Publication Date: 2011-01-26
NIPPON LIGHT METAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, when a thick aluminum foil is used and the etched part is deepened, there is a problem in the conventional etchin...

Method used

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  • Process for producing aluminum electrode plate for electrolytic capacitor
  • Process for producing aluminum electrode plate for electrolytic capacitor
  • Process for producing aluminum electrode plate for electrolytic capacitor

Examples

Experimental program
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Embodiment

[0040] Next, examples of the present invention will be described.

[0041] (examination result of kind of additive)

[0042] Firstly, the slab with the purity of aluminum above 99.99% by mass, containing 15ppm of copper, 30ppm of iron, 40ppm of silicon, and the rest of other unavoidable impurities undergoes specified rolling to obtain an aluminum plate with a thickness of 0.25mm, and then , Alternating current etching was performed on the aluminum plate under the following conditions to obtain an etched plate.

[0043] First stage etching (first etching process)

[0044] Composition of etching solution: mixed aqueous solution of 3 mol / L hydrochloric acid + 0.5 mol / L sulfuric acid

[0045] Etching solution temperature: 40°C

[0046] Electrolysis waveform: sine wave AC, frequency 50Hz

[0047] Current density: 0.5A / cm 2

[0048] Power: 30C / cm 2

[0049] Second stage etching (Second etching process)

[0050] Composition of etching solution: mixed aqueous solution of 7 mo...

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Abstract

In the production of an aluminum etched plate (1) for an electrolytic capacitor having a high level of capacitance by subjecting an aluminum plate to alternating current etching in an etching liquid to enlarge the face, an aluminum plate having an aluminum purity of not less than 99.98% by mass, a copper content of less than 30 ppm, and an iron content of 5 to 50 ppm is subjected to alternating current etching in an etching liquid containing not less than 0.01 ppm and less than 100 ppm of an additive such as diethylenetriaminepentaacetic acid, ethylenediaminetetraacetic acid, or diethylhexyl phthalate mixed therein.

Description

technical field [0001] The present invention relates to a method for manufacturing an aluminum electrode plate for an electrolytic capacitor obtained by etching an aluminum plate. Background technique [0002] In recent years, with the digitalization and high frequency of personal computers and information equipment, electrolytic capacitors are required to be thinner, lower in impedance, and lower in ESR, and lower in ESL and higher in capacity. In response to these demands, development of solid aluminum electrolytic capacitors is underway. However, in order to increase the capacity of electrolytic capacitors, it is necessary to increase the etching ratio of aluminum foil. [0003] Therefore, it has been proposed to increase the capacitance by thickening the aluminum foil and performing deep etching (see Patent Document 1). [0004] Patent Document 1: Japanese Patent Laid-Open No. 2005-150705 [0005] However, when a thick aluminum foil is used and the etched portion is d...

Claims

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Application Information

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IPC IPC(8): H01G9/04
CPCH01G9/055H01G9/045H01G9/0032
Inventor 片野雅彦矶部昌司小林达由树吉田祐也
Owner NIPPON LIGHT METAL CO LTD
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