Formed foil for aluminum electrolytic capacitor and production process thereof

An aluminum electrolytic capacitor and production process technology, applied in the direction of electrolytic capacitors, electrolytic capacitor manufacturing, capacitors, etc., can solve the problems of low oxide film quality, blockage, low specific volume, etc., and achieve dense oxide film, small pressure resistance thickness, Effect of improving specific volume and flexural strength

Active Publication Date: 2019-01-11
RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, with this production process, the oxide film produced during the chemical formation process is relatively thick, and it is easy to block the micropores in the corroded aluminum foil, reducing the surface area of ​​the oxide film, and the quality of the obtained oxide film is low. Therefore, the prepared formed foil has the defects of low mechanical strength and low specific volume in actual work, which cannot meet the needs of producing aluminum electrolytic capacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A production process for forming foils with high strength and high specific capacity in aluminum electrolytic capacitors, including the following steps:

[0028] The aluminum foil with a purity of 99.99% after electrolytic corrosion was immersed in pure water at 97°C for 12 minutes.

[0029] In the primary formation tank, liquid spray the pre-treated aluminum foil with a 2wt% boric acid solution at 85°C and perform primary formation to obtain primary formation foil; the flow rate of the liquid spray is 20L / h, The spraying time is 1 minute; the formation voltage of the first-level formation is 80V, and the current density is 60mA / cm 2 , The transformation time is 5 minutes.

[0030] In the secondary formation tank, the primary formation foil is sprayed with a 2wt% boric acid solution at 85℃, and the secondary formation is carried out to obtain the secondary formation foil; where the liquid spray flow rate is 20L / h, and the spray The shower time is 1 minute, the formation volta...

Embodiment 2

[0040] A production process for forming foils with high strength and high specific capacity in aluminum electrolytic capacitors, including the following steps:

[0041] The aluminum foil with a purity of 99.99% after electrolytic corrosion was immersed in pure water at 97°C for 12 minutes.

[0042] In the primary formation tank, liquid spray the pre-treated aluminum foil with a 2wt% boric acid solution at 85°C and perform primary formation to obtain primary formation foil; wherein the liquid spray flow rate is 40L / h, spray The shower time is 1 minute; the first-level formation voltage is 80V, and the current density is 60mA / cm 2 , The transformation time is 5 minutes.

[0043] In the secondary formation tank, the primary formation foil is sprayed with a 2wt% boric acid solution at 85°C, and the secondary formation is carried out to obtain the secondary formation foil; the liquid spray flow rate is 40L / h, and the spray The shower time is 1 minute, the secondary formation voltage is 1...

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PUM

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Abstract

The invention relates to a formation foil for an aluminium electrolytic capacitor and a production process of the formation foil. The production process comprises the following steps of 1) performing pretreatment on an electrolytic corrosion foil; 2) performing liquid spraying and four-stage formation on an aluminium foil by a formation solution; 3) cleaning; 3) performing sheet burning; 5) performing five-stage formation and six-stage formation on the four-stage formed foil to obtain six-stage formed foil; 6) performing after treatment; and 7) cleaning the six-stage formed foil after the foil is subjected to after treatment, and putting into a drying oven to be dried. According to the formation process of the formation foil for the aluminium electrolytic capacitor disclosed by the invention, a technology of spraying by formation groove liquid is added, so that impurities in corrosion holes can be effectively removed and surface fiber-shaped aluminium oxide crystals can be dissolved, and growth of outer layer hydrate is controlled; and a compact oxide film is generated through six-stage formation, so that specific capacity and anti-bending strength of the formation foil are further improved.

Description

Technical field [0001] The invention relates to a formed foil and its production process, in particular to a formed foil for aluminum electrolytic capacitors and its production process. Background technique [0002] The basic structure of a general-purpose aluminum electrolytic capacitor is a foil-wound structure, which is made up of 4 layers of overlapped and wound anode aluminum foil, electrolytic paper, cathode aluminum foil, and electrolytic paper. The working medium is to form an oxide film on the surface of the aluminum foil through anodizing, and this oxide film dielectric layer is combined with the anode of the capacitor to form a complete system. The selected anode foil and cathode foil are usually formed foils after corrosion treatment. The reason is that corrosion can make the surface area of ​​the aluminum foil much larger than its apparent surface area, so that a large electrostatic capacity can be obtained after formation (energization). Effective use of its actual...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/055H01G9/045H01G9/00
CPCH01G9/0029H01G9/045H01G9/055
Inventor 郭旭东汪启桥
Owner RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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