Chemical formation treatment method for improving water resistance of low pressure chemical formation foil

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: 2016-04-13
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 corroded aluminum foil with a purity of 99.9%, place the aluminum foil in 0.5% by mass percent adipate aqueous solution, dip it at 40°C for 3 minutes, then take out the adipic acid with a mass percent 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 solution with a...

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% by mass percent adipate aqueous solution, dip it for 3 minutes at 50°C, and take out the adipic acid with a mass percent 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 acid ...

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PUM

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Abstract

The invention discloses a chemical conversion treatment method for improving the water resistance of low-pressure chemical formed foil, which comprises dipping the aluminum foil in an aqueous solution of adipate, taking it out and placing it in an aqueous solution of ammonium adipate and adipate, and then Formation, take out and wash with water, then conduct high-temperature heat treatment, then place in the mixed aqueous solution of ammonium adipate and dihydrogen phosphate, perform secondary formation, take out and wash with water, and then treat in phosphoric acid solution at high temperature, then perform high-temperature heat treatment and water washing, Finally, put it in the dihydrogen phosphate aqueous solution, take it out after the tertiary formation, wash it with water, and dry it. The invention has the advantages of obviously improving the water resistance of the product, prolonging the storage time and improving the performance of the capacitor.

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 Patents(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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