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Formation foil for aluminium electrolytic capacitor and production process of formation foil

A technology of aluminum electrolytic capacitors and production technology, applied in electrolytic capacitors, electrolytic capacitor manufacturing, capacitors, etc., can solve the problems of low oxide film quality, low specific volume, blocking, etc., achieve dense oxide film, improve specific volume and resistance Effect of small bending strength and compressive thickness

Active Publication Date: 2017-05-10
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 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 spray time is 1 minute; the formation voltage of the primary formation is 80V, and the current density is 60mA / cm 2 , 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, and the current density is 60mA / cm 2 , 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 showe...

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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 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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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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