Method for manufacturing anodic foil of aluminum electrolytic capacitor

A technology for aluminum electrolytic capacitors and manufacturing methods, which is applied in the direction of electrolytic capacitors, capacitors, circuits, etc., can solve problems such as long hydration-resistant boosting time, decreased oxide film withstand voltage value, and fast boosting time recovery, etc., to improve product quality , the bending strength is improved, and the production process is simple

Inactive Publication Date: 2010-05-12
GUANGXI HEZHOU GUIDONG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The products produced by this method have poor bending strength, long hydration-resistant boosting time, fast boosting tim

Method used

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  • Method for manufacturing anodic foil of aluminum electrolytic capacitor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Use a medium-pressure corroded foil with a purity of more than 99.99% to boil in pure water at 96°C for 5 minutes, then conduct a primary constant pressure 130V formation for 10 minutes in the formation solution of citric acid and its salts; Secondary constant voltage 280V formation for 10min in the formation solution of salts; followed by a third level constant pressure 315V formation for 20min in the formation solution of azelaic acid and its salts; heat treatment at 400°C for 1min; Press 315V for 10 minutes; perform phosphoric acid treatment in 1v / v% phosphoric acid solution at 80°C for 5 minutes; phosphating treatment is immersion treatment at 5v / v% concentration of phosphoric acid-based treatment agent at 80°C for 1min , the phosphoric acid-based treatment agent is phosphoric acid. The temperature of the second heat treatment is 400° C. for 1 min.

[0014] After testing for 3 months of storage, the variation of the voltage rise time of the oxide film of the anode ...

Embodiment 2

[0019] Use a high-pressure corroded foil with a purity of more than 99.99% to boil in pure water at 96°C for 10 minutes, then conduct a primary constant pressure 200V formation for 15 minutes in the formation solution of citric acid and its salts; Carry out secondary constant pressure 400V for 15min in a similar chemical forming solution; followed by a third level of constant pressure 530V for 30min in a chemical forming solution containing azelaic acid and its salts; heat treatment at 500°C for 3min; Press 530V for 15 minutes; carry out phosphoric acid treatment in 6v / v% phosphoric acid solution at 70°C for 10 minutes; phosphating treatment is immersion treatment at 60°C for 5 minutes at a concentration of phosphoric acid-based treatment agent of 2v / v% , the phosphoric acid-based treatment agent is phosphorous acid. Ammonium dihydrogen solution and 85% phosphorous acid. The temperature of the second heat treatment is 300° C. for 3 minutes.

[0020] After testing for 3 month...

Embodiment 3

[0025] Use a high-pressure corroded foil with a purity of more than 99.99% to boil in pure water at 96°C for 15 minutes, and then conduct a primary constant pressure 250V formation for 20 minutes in the formation solution of citric acid and its salts; Carry out secondary constant pressure 480V for 20min in the chemical forming liquid of azelaic acid and its salts; then carry out three-stage constant pressure 590V for 40min in the chemical forming liquid of azelaic acid and its salts; conduct heat treatment at 550°C for 5min; 590V for 20 minutes; phosphoric acid treatment in 10v / v% phosphoric acid solution at 60°C for 15 minutes; phosphating treatment is 10 minutes of immersion treatment at a concentration of phosphoric acid-based treatment agent at 1v / v% and a temperature of 20°C. The phosphoric acid-based treatment agent is 50 wt% ammonium dihydrogen phosphate solution and 50 wt% ammonium hypophosphite solution. The temperature of the second heat treatment is 80° C. for 5 min...

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Abstract

The invention discloses a method for manufacturing an anodic foil of an aluminum electrolytic capacitor, which comprises the following steps of boiling treatment, three polarization, heat treatment, formation, phosphate treatment, formation, heat treatment, and reformation. Different from the prior art, the phosphate treatment is carried out before the second heat treatment, and an after-treatment is removed. The phosphate treatment is dipping treatment performed under the conditions of the concentration of a phosphate treating agent of between 1 and 5 v/v%, and the temperature of between 20 and 80 DEG C for 1 to 10 minutes. The method can ensure that after three months of storage, the anodic foil of the aluminum electrolytic capacitor has short boosting time, short hydration resistance boosting time, stable pressure resistance and good bending performance.

Description

technical field [0001] The invention belongs to the technical field of electronic material manufacturing, and in particular relates to a method for manufacturing an anode foil of an aluminum electrolytic capacitor. Background technique [0002] At present, the manufacturing method of high-voltage anode foil for aluminum electrolytic capacitors includes boiling treatment, followed by three-stage formation, heat treatment, formation, phosphoric acid treatment, formation, heat treatment, re-formation and post-treatment processes. The products produced by this chemical conversion method have poor bending strength, long hydration-resistant boosting time, fast boosting time recovery after storage for 3 months, reduced pressure resistance value of oxide film after boiling, and unstable product quality. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method that can improve the bending strength ...

Claims

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Application Information

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IPC IPC(8): H01G9/045H01G9/055C25D11/36
Inventor 宋洪洲陆宝琳杨林桑
Owner GUANGXI HEZHOU GUIDONG ELECTRONICS TECH
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