Production method of high-pressure formation foil in the foil-free ash

A production method, medium and high voltage technology, applied in the direction of circuits, capacitors, electrolytic capacitors, etc., can solve the problems of reduced and undetected hydration sensitivity of aluminum oxide film, and achieve miniaturization, improved dust control and long life Effect

Inactive Publication Date: 2018-08-07
GUANGXI HEZHOU GUIDONG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These substances can reduce the sensitivity of the aluminum oxide film to hydration, thereby playing a passivation role and improving the hydration resistance of the formed foil and its capacitor products, such as application numbers 200710124278.X and 200610063522.1, but it has not been found that by removing A Study of the Way to Improve the Performance of Aluminum Electrolytic Capacitors

Method used

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  • Production method of high-pressure formation foil in the foil-free ash

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Effect test

Embodiment 1

[0051] A production method for foil-free ash medium-high pressure forming foil, the steps of which are:

[0052] (1) Pretreatment: Soak the medium and high pressure corroded foil in pure water with a temperature of 96°C and a resistance greater than 1MΩ for 12 minutes;

[0053] (2) Primary chemical conversion treatment: place the corroded foil after pretreatment in a mixed solution with a temperature of 90°C and a mass content of 3% boric acid and 0.5‰ ammonium pentaborate, apply a voltage of 150V, and treat at a constant voltage for 10 minutes;

[0054] (3) Secondary chemical conversion treatment: place the corroded foil after primary chemical conversion treatment in a mixed solution with a temperature of 90°C, a mass content of 3% boric acid and 0.5‰ ammonium pentaborate, apply a voltage of 310V, and treat at a constant voltage for 10 minutes;

[0055] (4) Three-stage chemical conversion treatment: place the corroded foil after the two-stage chemical conversion treatment in ...

Embodiment 2

[0065] A production method for foil-free ash medium-high pressure forming foil, the steps of which are:

[0066] (1) Pretreatment: Soak the medium and high pressure corroded foil in pure water with a temperature of 96°C and a resistance greater than 1MΩ for 12 minutes;

[0067] (2) Primary chemical conversion treatment: place the corroded foil after pretreatment in a mixed solution with a temperature of 90°C and a mass content of 3% boric acid and 0.8‰ ammonium pentaborate, apply a voltage of 150V, and treat at a constant voltage for 10 minutes;

[0068] (3) Secondary chemical conversion treatment: place the corroded foil after primary chemical conversion treatment in a mixed solution with a temperature of 90°C, a mass content of 3% boric acid and 0.5‰ ammonium pentaborate, apply a voltage of 310V, and treat at a constant voltage for 10 minutes;

[0069] (4) Three-stage chemical conversion treatment: place the corroded foil after the two-stage chemical conversion treatment in ...

Embodiment 3

[0079] A production method for foil-free ash medium-high pressure forming foil, the steps of which are:

[0080] (1) Pretreatment: Soak the medium and high pressure corroded foil in pure water with a temperature of 96°C and a resistance greater than 1MΩ for 12 minutes;

[0081] (2) Primary chemical conversion treatment: place the corroded foil after pretreatment in a mixed solution with a temperature of 90°C and a mass content of 3% boric acid and 1‰ ammonium pentaborate, apply a voltage of 150V, and treat at a constant voltage for 10 minutes;

[0082] (3) Secondary chemical conversion treatment: place the corroded foil after primary chemical conversion treatment in a mixed solution with a temperature of 90°C, a mass content of 3% boric acid and 0.5‰ ammonium pentaborate, apply a voltage of 310V, and treat at a constant voltage for 10 minutes;

[0083] (4) Three-stage chemical conversion treatment: place the corroded foil after the two-stage chemical conversion treatment in a ...

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Abstract

The invention discloses a production method of high-pressure formation foil in foil-free ash, wherein medium and high pressure corrosion foil is subjected to pre-treatment, multi-stage formation treatment, primary high-temperature roasting treatment, primary formation repair treatment, secondary formation repair treatment, secondary high-temperature roasting treatment, and third-time formation repair treatment and post-treatment in sequence. Middle treatment is added between the primary formation repair treatment and the secondary formation repair treatment. In the middle treatment, the corrosion foil subjected to primary formation repair treatment is subjected to acid pickling by adopting a phosphoric acid solution, wherein the concentration of the phosphoric acid solution is 1.4-2.0 mol/L, and the acid pickling temperature ranges from 60 DEG C to 80 DEG C, and the acid pickling time is 8-20 min. According to the method, the relation between the foil ash and the performance of the aluminum electrolytic capacitor is found for the first time. A middle process of phosphoric acid pickling is added to remove formation foil ash powder, so that the dust control can be improved, and aluminum electrolytic capacitor breakdown phenomena can be reduced in an aluminum electrolytic capacitor manufacturing and cutting process.

Description

technical field [0001] The invention relates to the technical field of anode foil corrosion for aluminum electrolytic capacitors, in particular to a production method for foil-free ash medium-high voltage forming foil. Background technique [0002] Long life and miniaturization are inevitable trends in the development of aluminum electrolytic capacitors. Electrolytic etching of high-purity aluminum foil with {100} texture to expand its specific surface area and increase specific capacitance is the most effective technical way to miniaturize aluminum electrolytic capacitors. [0003] At present, the formation process of medium and high pressure aluminum foil generally includes pretreatment, primary chemical formation treatment, secondary chemical formation treatment, third-level chemical formation treatment, fourth-level chemical formation treatment, one-time high-temperature roasting treatment, one-time chemical formation repair treatment, intermediate treatment, and second ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055C25F3/04
CPCC25F3/04H01G9/055
Inventor 杨小飞彭游其陆宝琳
Owner GUANGXI HEZHOU GUIDONG ELECTRONICS TECH
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