Formation Method for Reducing Leakage Current of Medium and High Voltage Formation Foil

A chemical formation method and foil formation technology, which are applied to circuits, capacitors, electrical components, etc., can solve the problems of large leakage current, low production efficiency, and long time consumption of electrode foils, and achieve reduced leakage current rate, improved production efficiency, and short formation time. The effect of shortening

Active Publication Date: 2019-02-12
FOSHAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] It is not difficult to see that the chemical formation method disclosed in Chinese patent application CN201310178213.9 includes seven stages of chemical formation, the process is complex, time-consuming and low in production efficiency
Although the Chinese patent application CN201010158549.5 discloses a relatively simplified process, which only includes 5-stage formation, the electrode foil prepared by this method has a large leakage current, and the problem of low production efficiency has not been solved, and the process is still time-consuming.

Method used

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  • Formation Method for Reducing Leakage Current of Medium and High Voltage Formation Foil

Examples

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Effect test

Embodiment 1

[0027] Take the corroded aluminum foil with a purity of 99.99%, immerse the aluminum foil in water at 85°C for 5 minutes, and then place it in 0.4% sodium azelate aqueous solution with a mass percentage of 0.4%, at 78°C, the current density is 40mA / cm 2 1. Under the condition of a voltage of 150V, the first stage is formed for 5 minutes, and the first water washing is taken out. Place the aluminum foil after washing once in a 1.5% aqueous solution of sodium azelate at 82°C with a current density of 40mA / cm 2 1. Under the condition of the voltage of 310V, the second stage is formed for 4 minutes, and then taken out and washed with water for the second time. Place the aluminum foil after the secondary water washing in 0.8% by mass percent sodium azelate aqueous solution, at 80°C, the current density is 40mA / cm 2 1. Under the condition of 450V voltage, the three-stage formation takes 5 minutes. The aluminum foil after the tertiary chemical synthesis was placed in 0.7% 3,5-dihyd...

Embodiment 2

[0029] Take corroded aluminum foil with a purity of 99.99%, immerse the aluminum foil in water at 88°C for 5 minutes, then place it in 1.5% aqueous solution of sodium azelate by mass, at 77°C, the current density is 40mA / cm 2 , Under the condition of a voltage of 150V, the first stage was formed for 4 minutes, and the first water washing was taken out; the aluminum foil after the first water washing was placed in an aqueous solution of sodium azelate with a mass percentage of 1.8%, at 83°C, and the current density was 40mA / cm 2 , Under the condition of a voltage of 310V, the secondary formation was carried out for 6 minutes, and the second water washing was taken out; the aluminum foil after the second water washing was placed in an aqueous solution of 0.8% by mass of sodium azelate, at 77°C, the current density was 40mA / cm 2 , Under the condition of voltage of 450V, the three-stage chemical conversion was carried out for 6 minutes; the aluminum foil after the three-stage che...

Embodiment 3

[0031] Take the corroded aluminum foil with a purity of 99.99%, immerse the aluminum foil in 82°C water for 6 minutes, then place it in a 2% sodium azelate aqueous solution by mass, at 80°C, the current density is 40mA / cm 2 , Under the condition of a voltage of 150V, the first stage is formed for 4 minutes, and the first washing is taken out; the aluminum foil after the first washing is placed in a 1.2% aqueous solution of sodium azelate at 81°C, and the current density is 40mA / cm 2 , Under the condition of a voltage of 310V, the secondary formation was carried out for 4 minutes, and the second water washing was taken out; the aluminum foil after the second water washing was placed in an aqueous solution of sodium azelate with a mass percentage of 1.3%, at 80°C, the current density was 40mA / cm 2 , Under the condition of a voltage of 450V, the three-stage chemical reaction was performed for 4 minutes; the aluminum foil after the three-stage chemical reaction was placed in 0.7%...

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Abstract

The invention discloses a formation method capable of reducing the leak current in medium and high voltage formed foils. The method herein includes the following steps: immersing an aluminum foil in water, then immersing the aluminum foil in an azelate solution, performing first level formation, then performing first level rinsing, then placing the aluminum foil in the azelate solution, perform second level formation, and second level formation, placing the aluminum foil in the azelate solution, performing third level formation, immersing the aluminum foil which undergoes formation through the third level formation to a 3, 5 dihydroxy-benzoic acid solution, performing high-temperature heat treatment, placing the aluminum foil which undergoes the high temperature treatment in a boric acid and strontium phosphate solution, performing fourth level formation, performing high temperature heat treatment, finally placing the aluminum foil in a boric acid and strontium phosphate solution and performing fifth level formation, then immersing the aluminum foil in a phosphoric acid solution, taking out the aluminum foil, rinsing the aluminum foil, and drying the aluminum foil. According to the invention, the method herein allows products to have explicit reduction of leak current, and since the intensity of the formed current has doubled, the time for formation reduced by half, and seven formation steps has reduced to five, production efficiency has doubled.

Description

technical field [0001] The invention relates to a formation method for reducing the leakage current of an anode foil for a capacitor, and is especially suitable for a formation method for reducing the leakage current of an anode foil for a medium-high voltage aluminum electrolytic capacitor. Background technique [0002] In the manufacture of electrode foil for aluminum electrolytic capacitors, a dense oxide film needs to be formed on the surface of the aluminum foil as the working medium of the capacitor. The method often adopts chemical conversion treatment. The so-called chemical conversion treatment is to treat the metal surface by chemical or electrochemical methods to obtain a coating of metal compounds. The purpose is to improve corrosion resistance, coating adhesion, metal coloring and chemical grinding. [0003] At present, the chemical conversion systems mainly include boric acid forming liquid system, phosphoric acid forming liquid system, and adipic acid forming ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G13/06H01G9/055
CPCH01G9/055H01G13/06
Inventor 杨富国杨飞张玉红
Owner FOSHAN UNIVERSITY
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