A method for improving the leakage current performance of medium and high voltage electronic aluminum foil

An electronic aluminum foil, medium and high voltage corrosion foil technology, applied in circuits, capacitors, electrical components, etc., can solve the problem of insufficient leakage current effect, and achieve the effect of improving the leakage current characteristics of aluminum foil, improving the density, and improving the leakage current performance.

Active Publication Date: 2020-02-21
新疆广投桂东电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In patent application numbers CN200510038770.6 and CN201310007914.6, after oxalic acid is used for boiling, before electrochemical conversion, the corroded foil after boiling is mainly processed; in patent application number CN200910162682.5, although oxalic acid is used, but The effect of reducing the leakage current is not obvious enough
At present, there is no research report on the use of oxalic acid, ammonia water and boric acid to eliminate the influence of the porous oxide film on the outermost layer of the dielectric oxide film, thereby improving the leakage current performance of electronic aluminum foil.

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  • A method for improving the leakage current performance of medium and high voltage electronic aluminum foil

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Embodiment 1

[0023] A method for improving the leakage current performance of medium and high voltage electronic aluminum foil, the rated voltage is 230VF, the specific steps are as follows:

[0024] (1) Boiling: Boil the corroded foil in pure water at 90°C for 5 minutes;

[0025] (2) Soaking in boric acid: soak the boiled corroded foil in 4wt% boric acid solution at 60°C for 5 minutes;

[0026] (3) Primary formation: put the corroded foil soaked in boric acid in the primary formation solution for formation, the formation voltage is 58V, the formation temperature is 90°C, and the formation time is 5 minutes;

[0027] (4) Two-stage formation: perform two-stage formation on the corroded foil after one-stage formation, the formation voltage is 138V, the formation temperature is 90°C, and the formation time is 5 minutes;

[0028] (5) Three-stage formation: The corrosion foil after two-stage formation is subjected to three-stage formation, the formation voltage is 230V, the formation temperatu...

Embodiment 2

[0040] A method for improving the leakage current performance of medium and high voltage electronic aluminum foil, the rated voltage is 360VF, the specific steps are as follows:

[0041] (1) Boiling: Boil the corroded foil in pure water at 95°C for 7 minutes;

[0042] (2) Boric acid soaking: soak the boiled corroded foil in 6wt% boric acid solution at 80°C for 8 minutes;

[0043] (3) Primary formation: Put the corroded foil soaked in boric acid in the primary formation solution for formation, the formation voltage is 126V, the formation temperature is 92°C, and the formation time is 10 minutes;

[0044] (4) Two-stage formation: The corroded foil that has undergone primary formation is subjected to two-stage formation, the formation voltage is 270V, the formation temperature is 92°C, and the formation time is 10 minutes;

[0045] (5) Three-stage formation: The corroded foil after two-stage formation is subjected to three-stage formation, the formation voltage is 360V, the form...

Embodiment 3

[0057] A method for improving the leakage current performance of medium and high voltage electronic aluminum foil, the rated voltage is 660VF, the specific steps are as follows:

[0058] (1) Boiling: Boil the corroded foil in pure water at 98°C for 20 minutes;

[0059] (2) Boric acid soaking: soak the boiled corroded foil in 8wt% boric acid solution at 80°C for 10 minutes;

[0060] (3) Primary formation: Put the corroded foil soaked in boric acid in the primary formation liquid for formation, the formation voltage is 231V, the formation temperature is 92°C, and the formation time is 20 minutes;

[0061] (4) Two-stage formation: The corroded foil that has undergone primary formation is subjected to two-stage formation, the formation voltage is 490V, the formation temperature is 92°C, and the formation time is 20 minutes;

[0062] (5) Three-stage formation: The corroded foil after two-stage formation is subjected to three-stage formation, the formation voltage is 660V, the form...

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Abstract

The invention discloses a method for improving current leakage performance of a medium- and high-voltage electronic aluminum foil. The method comprises the steps of performing boiling, boric acid immersion, multi-stage formation, ammonia water immersion, high-temperature thermal processing A, formation again A, oxalic acid immersion, formation again B, high-temperature thermal processing B, formation again C, phosphorization and drying on the medium- and high-voltage electronic aluminum foil, in the step of boric acid immersion, the boiled corrosion foil is placed in 4-8wt% of boric acid solution at 60-80 DEG C for immersion, and the time is 5-10 minutes; in the step of ammonia water immersion, the corrosion foil after multi-stage formation is placed in an ammonia solution for immersion, apH value of the ammonia solution is 8.0-10.0, and the immersion time is 2-10 minutes; and in the step of oxalic acid immersion, the corrosion foil after formation again A is placed in 0.5-2.0wt% of oxalic acid solution for immersion, the time is 5-20 minutes, and the temperature is 70-90 DEG C. By the method, the state of a dielectric oxide film at an outer layer of the aluminum foil can be changed, so that the current leakage performance of the electronic aluminum foil is improved.

Description

technical field [0001] The invention belongs to the technical field of electronic aluminum foil manufacturing, in particular to a method for improving the leakage current performance of medium and high voltage electronic aluminum foil. Background technique [0002] The formation process of conventional medium and high voltage electronic aluminum foil generally includes boiling treatment, multi-stage formation, heat treatment, re-formation, phosphoric acid treatment, re-formation, post-treatment, drying and other processes. The boiling treatment is to boil the corroded foil in pure water above 95°C for 5 to 15 minutes, and the formation temperature is above 85°C to finally obtain a dielectric oxide film (γ’-Al 2 o 3 (γ-Al 2 o 3 )); the outermost layer of this dielectric oxide film is a porous oxide film (industrial production is characterized by serious foil dust or aluminum powder), with a loose structure and no insulating properties. Excessive porous oxide films will inc...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H01G13/00
CPCH01G13/00
Inventor陆宝琳杨林桑黄胜权
Owner新疆广投桂东电子科技有限公司