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Formation processing method for reducing leaking current of low-voltage formation foil

A technology of chemical formation treatment and foil formation, which is applied in the direction of capacitor electrodes and capacitor parts, can solve the problems of large leakage current, unstable product performance, and short life of capacitors, so as to prolong the service life, be easy to implement, and reduce the leakage current of products Effect

Active Publication Date: 2015-05-20
NANTONG HAIXING ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With this method of manufacturing electrode foil, the leakage current of the product is large, the life of the capacitor is short, and the performance of the product is unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Take the corroded aluminum foil with a purity of 99.9%, place the aluminum foil in a 0.5% adipic acid aqueous solution by mass ratio, soak it at 50°C for 3 minutes and take it out; The aluminum foil impregnated in the saline solution is placed in the aqueous solution of adipate with a mass percentage of 8%, at 72°C, the current density is 20mA / cm 2 , Under the condition of a voltage of 48V, form it for 20 minutes, take it out and wash it for the first time; put the aluminum foil after the first washing into a 6% phosphoric acid aqueous solution at a temperature of 55°C for 1 to 5 minutes Passivation treatment, take it out and wash it for the second time; place the aluminum foil after the second water washing in a mixed aqueous solution of 2% adipate by mass percentage and 0.1% by mass percentage of dihydrogen phosphate, at 85°C , the current density is 20mA / cm 2 , Under the condition of a voltage of 48V, it is formed for 5 minutes, taken out and washed for t...

Embodiment 2

[0017] Example 2: Take corroded aluminum foil with a purity of 99.9%, place the aluminum foil in an aqueous adipate solution with a mass ratio of 0.8%, and take it out after immersion at 60°C for 3 minutes; The aluminum foil impregnated in the saline solution is placed in the aqueous solution of adipate with a mass percentage of 5%, at 78°C, the current density is 20mA / cm 2 , Under the condition of a voltage of 48V, form it for 20 minutes, take it out and wash it for the first time; put the aluminum foil after the first washing into a 6% phosphoric acid aqueous solution at a temperature of 55°C for 1 to 5 minutes Passivation treatment, take it out and wash it for the second time; put the aluminum foil after the second water washing in the mixed aqueous solution of 4% adipate and 0.5% dihydrogen phosphate by mass percentage, at 85°C , the current density is 20mA / cm 2 , Under the condition of a voltage of 48V, it is formed for 5 minutes, taken out and washed for the third time;...

Embodiment 3

[0018] Example 3: Take corroded aluminum foil with a purity of 99.9%, place the aluminum foil in a 1.2% adipate aqueous solution by mass ratio, and take it out after immersion at 60°C for 3 minutes; The aluminum foil impregnated in the saline solution is placed in the aqueous solution of adipate with a mass percentage of 5%, at 78°C, the current density is 20mA / cm 2 , Under the condition of a voltage of 48V, form it for 20 minutes, take it out and wash it for the first time; put the aluminum foil after the first washing into a 6% phosphoric acid aqueous solution at a temperature of 55°C for 1 to 5 minutes Passivation treatment, take it out for the second washing; put the aluminum foil after the second washing in the mixed aqueous solution of ammonium adipate with a mass percentage of 5% and dihydrogen phosphate with a mass percentage of 0.3%, at 85°C , the current density is 20mA / cm 2 , Under the condition of a voltage of 48V, it is formed for 5 minutes, taken out and washed ...

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PUM

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Abstract

The invention discloses a formation processing method for reducing leaking current of low-voltage formation foil. The method comprises the steps as follows: placing aluminum foil in an adipate water solution of 0.5% to 2%, and dipping for 3 minutes under the condition of 40 to 60 DEG C; taking out the aluminum foil, then placing in an adipate water solution of 3% to 10%, and forming the aluminum foil for 20 minutes under the condition of 65 to 80 DEG C, 20mA / (cm)2 and 48 V; taking out the aluminum foil, and washing the aluminum foil with water; processing the aluminum foil in the phosphoric acid solution of 1% to 8% at the temperature from 50 to 80 DEG C; taking out the aluminum foil and then washing with water; placing the aluminum foil in the mixed water solution of adipate of 1% to 5% and dihydric phosphate of 0.1% to 1%, and forming for 5 minutes under the condition of 85 DEG C, 20mA / (cm)2 and 48V; taking out the aluminum foil and washing the aluminum foil with water; carrying out high-temperature thermal treatment of 400 to 550 DEG C for 1 to 5 minutes; placing the aluminum foil in the dihydric phosphate water solution of 0.1% to 1%, and forming for 5 minutes under the condition of 85 DEG C, 20mA / (cm)2 and 48V; and then taking out the aluminum foil, washing the aluminum foil with water and drying out the aluminum foil. The formation processing method for reducing leaking current of low-voltage formation foil has the advantages of obviously reducing the leaking current of the product and prolonging the service life of a capacitor.

Description

technical field [0001] The invention relates to a treatment method for reducing the leakage current of an electrode foil for a capacitor, and is especially suitable for a chemical conversion treatment method for reducing the leakage current of a low-voltage formation foil. Background technique [0002] The existing manufacturing method of electrode foil for low-voltage aluminum electrolytic capacitors is as follows: the corroded aluminum foil with a purity of 99.9% is placed in an aqueous solution of 3 to 10% ammonium adipate and adipate, and the 65~80℃, the current density is 20mA / cm 2 , Under the condition of a voltage of 48V, form for 20 minutes; take it out and wash it; treat it in a 1-8% phosphoric acid solution at a temperature of 50-80°C; take it out and wash it; put it in a 1-5% ammonium adipate aqueous solution, At 85°C, the current density is 20mA / cm 2 , Under the condition of a voltage of 48V, form for 5 minutes; take it out and wash it; then perform a high-temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/04
Inventor 严季新王建中金志刚
Owner NANTONG HAIXING ELECTRONICS