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Formation treatment method for improving water resistance of high-middle-pressure formed foil

A technology of chemical formation treatment and foil formation, which is applied in the direction of superimposed layer plating, metal material coating process, coating, etc., can solve the problems of poor water resistance and unstable product performance, shorten the boosting time, and be easy to implement. Effects that are easy to store

Active Publication Date: 2012-09-19
NANTONG HAIYI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With this manufacturing method of electrode foil, the hydrophobic film of the product is relatively thin, the boosting time after boiling is poor, the water resistance is poor, and the product performance is unstable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Take corroded aluminum foil with a purity of 99.99%, soak it in water at a temperature of 95°C for 5 minutes, then take it out and put it in an aqueous solution of fumaric acid with a mass percentage of 1%, at 80°C , take it out after dipping for 8 minutes; put the aluminum foil impregnated in the fumaric acid aqueous solution into the dihydrogen phosphate aqueous solution with a mass percentage of 5%, at 85°C, the current density is 20mA / cm 2 1. Under the condition of a voltage of 200V, carry out primary formation, and the formation time is 8 minutes; the aluminum foil after the primary formation is taken out for the first water washing; the aluminum foil after the first water washing is put into phosphoric acid with a mass percentage of 3%. In dihydrogen salt solution, at 85°C, the current density is 20mA / ㎝ 2 1. Under the condition that the voltage is 430V, carry out secondary formation, and the formation time is 8 minutes; the aluminum foil after the secon...

Embodiment 2

[0023] Example 2: Take the corroded aluminum foil with a purity of 99.99%, soak it in water at a temperature of 95°C for 12 minutes, take it out and put it in an aqueous solution of fumaric acid with a mass percentage of 0.4%, at 60°C , take it out after dipping for 8 minutes; put the aluminum foil impregnated in the fumaric acid aqueous solution into the dihydrogen phosphate aqueous solution with a mass percentage of 0.1%, at 85°C, the current density is 20mA / cm 2 1. Under the condition of a voltage of 200V, carry out primary formation, and the formation time is 15 minutes; take out the aluminum foil after the primary formation and wash it for the first time; put the aluminum foil after the first water washing into 0.1% by mass percentage of phosphoric acid In dihydrogen salt solution, at 85°C, the current density is 20mA / ㎝ 2 1. Under the condition that the voltage is 430V, carry out secondary formation, and the formation time is 15 minutes; take out the aluminum foil after t...

Embodiment 3

[0024] Example 3: Take the corroded aluminum foil with a purity of 99.99%, soak it in water at a temperature of 95°C for 12 minutes, take it out and put it in an aqueous solution of fumaric acid with a mass percentage of 1%, at 80°C , take it out after dipping for 8 minutes; put the aluminum foil impregnated in the fumaric acid aqueous solution into the dihydrogen phosphate aqueous solution with a mass percentage of 5%, at 85°C, the current density is 20mA / cm 2 1. Under the condition of a voltage of 200V, carry out primary formation, and the formation time is 15 minutes; take out the aluminum foil after the primary formation and wash it for the first time; put the aluminum foil after the first water washing into 3% phosphoric acid In dihydrogen salt solution, at 85°C, the current density is 20mA / ㎝ 21. Under the condition that the voltage is 430V, carry out the secondary formation, and the formation time is 15 minutes; the aluminum foil after the secondary formation is taken ou...

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PUM

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Abstract

The invention discloses a formation treatment method for improving water resistance of high-middle-pressure formed foil. The formation treatment method comprises immersing corroded aluminum foil with purity of 99.99% in water, taking the aluminum foil out, immersing the aluminum foil into fumaric acid water solution and then taking out; putting the aluminum foil into dihydric phosphate water solution to perform first-grade formation; taking out to perform washing; putting the washed aluminum foil into the dihydric phosphate water solution to perform second-grade formation; taking out to perform washing; putting the secondarily-washed aluminum foil into mixed water solution formed by boric acid and borate to perform third-grade formation; taking out the third-grade formed aluminum foil andputting into the water solution to perform fourth-grade formation; taking out the fourth-grade formed aluminum foil to perform high-temperature heat treatment and then putting into the water solutionto perform fifth-grade formation; taking out the fifth-grade formed aluminum foil and putting into phosphoric acid solution to perform processing; taking out the aluminum foil to perform washing and putting into the water solution to perform sixth-grade formation; and taking out the sixth-grade formed aluminum foil, immersing the aluminum foil in the dihydric phosphate water solution to perform washing, and performing drying. The formation treatment method has the advantages that the formation treatment method is simple, pressure rising time of manufactured products after boiling is shortened, and the water resistance is improved.

Description

technical field [0001] The invention relates to a treatment method for improving the water resistance of electrode foils for capacitors, in particular a chemical conversion treatment method suitable for improving the water resistance of electrode foils for medium and high voltage aluminum electrolytic capacitors. Background technique [0002] The existing manufacturing method of electrode foil for medium and high voltage aluminum electrolytic capacitors is as follows: immerse corroded aluminum foil with a purity of 99.99% in water at 95°C for 5-12 minutes; take it out and place it in 0.1-5% phosphoric acid diphosphate In hydrogen salt solution, at 70-95°C, 20mA / (cm) 2 , 200V, into 8-15 minutes; take out and wash; put in 0.1-3% dihydrogen phosphate aqueous solution, at 85°C, 20mA / (cm) 2 , 430V, into 8-15 minutes; take out and wash; put in 4-9% boric acid and 0.1-1% borate aqueous solution, at 85°C, 20mA / (cm) 2 , 590V conditions, into 8-15 minutes; placed in the same three-l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/04
Inventor 严季新王建中朱鸿伟
Owner NANTONG HAIYI ELECTRONICS
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