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Process method for treating and thinning middle-high voltage anode aluminum foil

A technology of anode aluminum foil and process method, which is applied to capacitors, circuits, electrical components, etc., can solve the problem of increased thickness of corroded foils, and achieve the effects of avoiding different thicknesses, increasing specific surface area, and improving efficiency

Active Publication Date: 2021-05-28
GUANGXI HEZHOU GUIDONG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the simplest and most effective way in industrial production is to increase the thickness of the optical foil to achieve the purpose of increasing the specific capacity, but this is followed by an increase in the excess thickness of the corroded foil, which leads to a contradiction with the development of miniaturization of capacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A process method for thinning medium and high voltage anode aluminum foil, which comprises the following steps:

[0023] (1) Pretreatment: Put the aluminum foil into solution A at a temperature of 80°C for 120 seconds, and the solution A contains the following components in mass percentage: 6% hydrochloric acid, 25% sulfuric acid;

[0024] (2) First-order porosity corrosion: wash the aluminum foil treated in step (1) with water, and then put it into solution B at a temperature of 74°C for first-level direct current porosity corrosion. The solution B contains the following mass percentage of Components: 6% hydrochloric acid, 25% sulfuric acid; in the first-order DC porosity corrosion, the applied current density is 600mA / cm 2 , the time of applying current is 80s;

[0025] (3) Intermediate corrosion treatment: Wash the aluminum foil treated in step (2) with water, and then soak it in solution C at a temperature of 60°C. The solution C contains the following components i...

Embodiment 2

[0030] A process method for thinning medium and high voltage anode aluminum foil, which comprises the following steps:

[0031] (1) Pretreatment: Put the aluminum foil into solution A at a temperature of 80°C for 120 seconds, and the solution A contains the following components in mass percentage: 6% hydrochloric acid, 25% sulfuric acid;

[0032] (2) First-order porosity corrosion: wash the aluminum foil treated in step (1) with water, and then put it into solution B at a temperature of 74°C for first-level direct current porosity corrosion. The solution B contains the following mass percentage of Components: 6% hydrochloric acid, 25% sulfuric acid; in the first-order DC porosity corrosion, the applied current density is 600mA / cm 2 , the time of applying current is 80s;

[0033] (3) Intermediate corrosion treatment: Wash the aluminum foil treated in step (2) with water, and then soak it in solution C at a temperature of 60°C. The solution C contains the following components i...

Embodiment 3

[0038] A process method for thinning medium and high voltage anode aluminum foil, which comprises the following steps:

[0039] (1) Pretreatment: Put the aluminum foil into solution A at a temperature of 80°C for 120 seconds, and the solution A contains the following components in mass percentage: 6% hydrochloric acid, 25% sulfuric acid;

[0040] (2) First-order porosity corrosion: wash the aluminum foil treated in step (1) with water, and then put it into solution B at a temperature of 74°C for first-level direct current porosity corrosion. The solution B contains the following mass percentage of Components: 6% hydrochloric acid, 25% sulfuric acid; in the first-order DC porosity corrosion, the applied current density is 600mA / cm 2 , the time of applying current is 80s;

[0041] (3) Intermediate corrosion treatment: wash the aluminum foil treated in step (2) with water, and then immerse it in solution C at a temperature of 60°C. The solution C contains the following components ...

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Abstract

The invention discloses a process method for treating and thinning a middle-high voltage anode aluminum foil. The method comprises the steps of pretreatment, first-stage hole forming corrosion, middle treatment corrosion, second-stage hole expanding corrosion, post-treatment and the like, and comprises the following steps: soaking aluminum foil in a mixed solution of hydrochloric acid and sulfuric acid, applying current to the mixed solution of hydrochloric acid and sulfuric acid to carry out direct-current hole-forming corrosion and carry out first-stage direct-current hole-forming corrosion, soaking the aluminum foil in a mixed solution of silicon hydrofluoric acid and phosphoric acid, then applying current to the aluminum foil in a nitric acid solution to carry out second-stage direct-current hole-forming corrosion, repeating the processes of intermediate treatment corrosion and second-stage hole-forming corrosion many times, soaking the aluminum foil in the nitric acid solution for post-treatment, finally cleaning the aluminum foil with tap water, cleaning the aluminum foil with pure water, and then drying and rolling the aluminum foil to obtain the corroded foil. The method can effectively remove the porous layer on the surface of the finished corrosion foil, reduces the residual thickness of the corrosion foil, does not reduce the specific volume, and improves the specific volume of the corrosion foil in unit thickness.

Description

technical field [0001] The invention belongs to the technical field of electrode foil production, and in particular relates to a process method for medium and high voltage anode aluminum foil treatment and thinning. Background technique [0002] Aluminum electrolytic capacitor is an energy storage component widely used in the electronic and electrical industry, and the anode foil for aluminum electrolytic capacitor is its energy storage raw material. With the rapid development of electronic information technology, the trend of miniaturization and large-capacity capacitors is becoming more and more obvious, and more and more attention is paid to the environmental protection of products. In the pursuit of increasing the capacity of medium and high voltage anode aluminum foil, more requirements are put forward. High environmental requirements. [0003] At present, the electrolytic corrosion process of medium and high voltage anode aluminum foil generally includes four main ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045
CPCH01G9/045
Inventor 杨小飞蒋碧君梁力勃蔡小宇熊传勇
Owner GUANGXI HEZHOU GUIDONG ELECTRONICS TECH
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