Formation processing method for improving low-voltage formed foil water resistance

A chemical formation treatment and foil formation technology, which is applied in the direction of metal surface removal regulations, electrical components, electrolytic capacitors, etc., can solve the problems of unstable product performance, poor water resistance, etc., and achieve the effect of prolonging storage time and capacitor life, and improving water resistance

Active Publication Date: 2013-08-21
NANTONG HAIXING ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manufacturing method of this electrode foil has poor water resistance and unstable product performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Take the corroded aluminum foil with a purity of 99.9%, place the aluminum foil in a 0.5% adipate aqueous solution by mass percentage, dip it for 3 minutes at 40°C, and take out the adipate with a mass percentage of 3%. In aqueous solution of ammonium diacid and adipate, at 65°C, current density 20mA / cm 2 , Under the condition of a voltage of 48V, perform primary formation for 20 minutes, then take it out and wash it for the first time, then heat-treat the aluminum foil after the first washing at 400°C for 1 minute, and then place the aluminum foil after the high-temperature treatment in In a mixed aqueous solution of 1% ammonium adipate and 0.1% dihydrogen phosphate by mass, at 85°C and a current density of 20mA / cm 2 , Under the condition of a voltage of 48V, the secondary formation was carried out for 5 minutes, and the aluminum foil was taken out for the second washing, and the aluminum foil after the second washing was treated in a phosphoric acid solutio...

Embodiment 2

[0016] Example 2: Take the corroded aluminum foil with a purity of 99.9%, place the aluminum foil in a 2% adipate aqueous solution by mass percentage, dip it for 3 minutes at 60°C, take out the adipate with a mass percentage of 10% In the aqueous solution of ammonium diacid and adipate, at 85°C, current density 20mA / cm 2 , Under the condition of a voltage of 48V, carry out the first-stage chemical conversion for 20 minutes, then take it out for the first water washing, and then perform the high-temperature heat treatment at 550°C for 5 minutes on the aluminum foil after the first water washing, and then place the aluminum foil after the high-temperature treatment in In a mixed aqueous solution of 5% ammonium adipate and 1% dihydrogen phosphate by mass, at 85°C and a current density of 20mA / cm 2 , Under the condition of a voltage of 48V, the secondary formation was carried out for 5 minutes, and the aluminum foil was taken out for the second washing, and the aluminum foil after...

Embodiment 3

[0017] Example 3: Take the corroded aluminum foil with a purity of 99.9%, place the aluminum foil in a 1% adipate aqueous solution by mass percentage, dip it for 3 minutes at 50°C, and take out the adipate with a mass percentage of 7%. In the aqueous solution of ammonium diacid and adipate, at 72°C, current density 20mA / cm 2 , Under the condition of a voltage of 48V, perform primary formation for 20 minutes, then take it out and wash it for the first time, then heat-treat the aluminum foil after the first water washing at 480°C for 3 minutes, and then place the aluminum foil after the high-temperature treatment in In a mixed aqueous solution of 3% ammonium adipate and 0.5% dihydrogen phosphate by mass, at 85°C and a current density of 20mA / cm 2 , Under the condition of a voltage of 48V, the secondary formation was carried out for 5 minutes, and the aluminum foil was taken out for the second washing, and the aluminum foil after the second washing was treated in a phosphoric aci...

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PUM

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Abstract

The invention discloses a formation processing method for improving low-voltage formed foil water resistance. The formation processing method comprises the steps that an aluminum foil is placed in an adipic acid saline solution for dipping, the aluminum foil is taken out and then placed in an ammonium adipate and adipate water solution, the aluminum foil is taken out for washing after first-level formation, and then high-temperature treatment is carried out; then the aluminum foil is placed in an ammonium adipate and dihydric phosphate mixed water solution for second-level formation, after being taken out and washed, the aluminum foil is placed in a phosphoric acid solution for heat treatment, then high-temperature treatment and washing are carried out, finally, the aluminum foil is placed in a dihydric phosphate water solution, and the aluminum foil is taken out after third-level formation and washed and dried. The formation processing method has the advantages that product water resistance is obviously improved, storage time is prolonged, and capacitor performance is improved.

Description

technical field [0001] The invention relates to a treatment method for improving the water resistance of an electrode foil for capacitors, and is especially suitable for a chemical conversion treatment method for improving the water resistance of a low-pressure formed foil. Background technique [0002] The existing manufacturing method of electrode foil for low-voltage aluminum electrolytic capacitors is as follows: take corroded aluminum foil with a purity of 99.9%, place the aluminum foil in a 0.5-2% adipate aqueous solution, and heat it at 40-60°C Immerse for 3 minutes under certain conditions; take it out and put it in the aqueous solution of adipate and adipate with a concentration of 3~10%, at 65~80°C, current density 20mA / (cm) 2 , Under the condition of a voltage of 48V, it was formed for 20 minutes; it was taken out and washed with water; then it was subjected to a high temperature heat treatment at 400~550°C for 1~5 minutes; Hydrogen salt mixed aqueous solution, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055H01G13/06
Inventor 严季新王建中朱鸿伟张校刚
Owner NANTONG HAIXING ELECTRONICS
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