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Aluminum foil for electrolytic capacitor electrode

A technology of electrolytic capacitors and electrodes, applied in the direction of electrolytic capacitors, capacitor electrodes, capacitors, etc., can solve the problem of high cost, and achieve the effect of low cost, low cost and high electrostatic capacity

Inactive Publication Date: 2008-04-16
MITSUBISHI ALUMINUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the above-mentioned conventional pure Al-based aluminum foil must be electrolytically etched, there is a problem of high cost.

Method used

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  • Aluminum foil for electrolytic capacitor electrode
  • Aluminum foil for electrolytic capacitor electrode

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Embodiment 1

[0048] Embodiments of the present invention are described below.

[0049] According to the composition shown in Table 1 (the remainder is Al and other impurities), an aluminum alloy ingot was obtained by a conventional method, and the aluminum alloy ingot was homogenized. Next, the ingot was subjected to a soaking treatment, then hot rolled to a thickness of 7 mm, and then cold rolled to a final thickness of 50 μm to obtain a test material. In Example 11, intermediate annealing was performed when the sheet thickness was 1 mm.

[0050] For the test material obtained, utilize SEM (scanning electron microscope, scanning electron microscope)-EDS (Energy Dispersive X-ray Spectrometer, energy dispersive X-ray spectrometer) to confirm as Al-Fe-Ni-Si system precipitate The density of Al-Fe-Ni-Si-based precipitates (circle-equivalent diameter of 1-5 μm) in the cross-section was observed for the particles by image analysis. The results are shown in Table 1.

[0051] In addition, the ...

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Abstract

The present invention relates to an aluminum foil used by the electrode of the electrolytic capacitor, the invention is characterized in that when calculated with mass % the invention comprises the following elements: Si 0.01 to 0.30%, Fe 0.01 to 0.30%, Ni 0.021 to less than 0.05%, Cu more than 0.010% to less than 0.10%, and the rest part includes Al and the inevitable impurity.

Description

technical field [0001] The present invention relates to an aluminum foil for an electrolytic capacitor electrode that is etched when used as an electrode of an electrolytic capacitor. Background technique [0002] As aluminum foils used for cathodes of electrolytic capacitors, pure Al-based and alloy-based (mainly Al-Cu-based and Al-Mn-based) have been used. Among them, the pure Al system has few impurities and high reliability, but has a problem of high cost due to its low solubility and the use of electrolytic etching. On the other hand, it is generally considered that the alloy system contains many impurities and has low reliability. For example, the Al—Cu system (for example, refer to Patent Document 1) improves etchability by containing Cu, but when assembled in a capacitor, Cu eluted into the electrolytic solution precipitates, causing safety (reliability) problems such as short circuits. In addition, in the Al-Mn system (for example, refer to Patent Document 2), the...

Claims

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Application Information

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IPC IPC(8): H01G9/04H01G9/045H01G9/055C22C21/00
Inventor 远藤昌也渡边英雄
Owner MITSUBISHI ALUMINUM CO LTD
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