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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, capacitors, circuits, etc., can solve the problems of blockage, low-quality oxide film, low specific volume, etc. The effect of volume and flexural strength

Inactive Publication Date: 2019-05-21
TIANQUAN JUNLI ELECTRONICS MATERIAL
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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

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Comparison scheme
Effect test

Embodiment 1

[0027] A high-strength and high-capacity forming foil production process for aluminum electrolytic capacitors, comprising the following steps:

[0028] Take an aluminum foil with a purity of 99.99% after electrolytic corrosion and place it in pure water at 97° C. for 12 minutes.

[0029] In the primary formation tank, the pretreated aluminum foil is sprayed with a 2wt% boric acid solution at 85°C and subjected to primary formation to obtain a primary formation foil; wherein, the flow rate of the liquid spray is 20L / h, The spraying time is 1 minute; the formation voltage of the primary formation is 80V, the current density is 60mA / cm2, and the formation time is 5 minutes.

[0030] In the secondary chemical formation tank, the primary chemical formation foil is sprayed with 2wt% boric acid solution at 85°C, and the secondary chemical formation is performed to obtain the secondary chemical formation foil; wherein, the liquid spray flow rate is 20L / h, and the spraying rate is 20L / ...

Embodiment 2

[0040] A high-strength and high-capacity forming foil production process for aluminum electrolytic capacitors, comprising the following steps:

[0041] Take an aluminum foil with a purity of 99.99% after electrolytic corrosion and place it in pure water at 97° C. for 12 minutes.

[0042]In the primary formation tank, the pretreated aluminum foil is sprayed with a 2wt% boric acid solution at 85°C and subjected to primary formation to obtain a primary formation foil; wherein, the liquid spray flow rate is 40L / h, and the spraying rate is 40L / h. The shower time is 1 minute; the primary formation voltage is 80V, the current density is 60mA / cm2, and the formation time is 5 minutes.

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

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Abstract

The invention relates to a formed foil for an aluminum electrolytic capacitor and a production process thereof. The production process comprises the following steps of 1) pre-treating the electrolyticcorrosion foil; 2) performing liquid spraying and four-stage formation on the aluminum foil with a formed solution; 3) cleaning ; 4) burning tablets; 5) performing five-stage and six-stage formationon four-stage formed oil to obtain a six-stage formed foil; 6) performing post-treatment; and 7) cleaning and placing the post-treated six-stage formed foil in an oven for drying. The process of a formed foil for an aluminum electrolytic capacitor according to the invention adds the technique of using liquidized spray for formed slots in the formation process to effectively remove impurities in corrosion holes, dissolve the surface fibrous alumina crystals and control the growth of the outer layer hydrate, and generates a dense oxide film by a six-stage formation to further increase the specific volume and bending strength of the formed foil.

Description

technical field [0001] The invention relates to a chemically formed foil and a production process thereof, in particular to a chemically formed foil for an aluminum electrolytic capacitor and a production process thereof. Background technique [0002] The basic structure of a general-purpose aluminum electrolytic capacitor is a foil winding structure, which is formed by overlapping and winding four layers of anode aluminum foil, electrolytic paper, cathode aluminum foil, and electrolytic paper. Its working medium is to form a layer of oxide film on the surface of aluminum foil through anodic oxidation, 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 ​​aluminum foil much larger than its apparent surface area, so that after formation (energization), a large electrostati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045H01G9/055
Inventor 杨小兵费新金
Owner TIANQUAN JUNLI ELECTRONICS MATERIAL
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