Ultrahigh voltage anode foil corrosion method for aluminum electrolytic capacitor

An aluminum electrolytic capacitor, ultra-high voltage technology, applied in the direction of electrolytic capacitors, capacitors, circuits, etc., can solve the problems of small holes in the anode foil, low specific volume, and inability to achieve the effect of low leakage current

Inactive Publication Date: 2013-03-20
GUANGXI HEZHOU GUIDONG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the defects that the anode foil produced by the existing corrosion technology has small holes, is easy to be blocked after formation, and has a low specific volume, and can only be used in the producti

Method used

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  • Ultrahigh voltage anode foil corrosion method for aluminum electrolytic capacitor

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Comparison scheme
Effect test

Embodiment 1

[0022] The corrosion method of ultra-high voltage anode foil for aluminum electrolytic capacitor of the present invention includes the following steps:

[0023] 1. Pretreatment:

[0024] The aluminum foil is immersed in a hydrochloric acid solution with a concentration of 2.0 wt% at 70°C for 150 seconds, and then taken out.

[0025] 2. Level 1 DC electrochemical corrosion:

[0026] Put the above pre-treated aluminum foil into a mixture of 3wt% hydrochloric acid, 20wt% sulfuric acid and 0.1wt% phosphoric acid at a temperature of 85°C and a concentration of 3wt% hydrochloric acid, 20wt% sulfuric acid and 0.1wt% phosphoric acid for direct current electrochemical corrosion. The current density is 0.5A / cm 2 , The power is 30C / cm 2 .

[0027] 3. Medium processing 1:

[0028] Put the above-mentioned aluminum foil that has undergone the first-level direct current electrochemical corrosion into a mixed solution of 3.5wt% hydrochloric acid and 0.08wt% oxalic acid at a temperature of 65°C and a cur...

Embodiment 2

[0038] Another embodiment of the ultra-high voltage anode foil corrosion method for aluminum electrolytic capacitors of the present invention includes the following steps:

[0039] 1. Pretreatment:

[0040] The aluminum foil is immersed in a hydrochloric acid solution with a concentration of 3.5 wt% at 65° C. for 120 seconds and taken out.

[0041] 2. Level 1 DC electrochemical corrosion:

[0042] Put the above-mentioned pre-treated aluminum foil into a mixed solution of 5wt% hydrochloric acid, 15wt% sulfuric acid and 0.25wt% phosphoric acid at a temperature of 80℃ and a concentration of 0.25wt% phosphoric acid for direct current electrochemical corrosion. The current density is 0.4A / cm 2 , The power is 30C / cm 2 .

[0043] 3. Medium processing 1:

[0044] Put the above-mentioned aluminum foil that has undergone the first-level direct current electrochemical corrosion into a mixed solution of 2wt% hydrochloric acid and 0.02wt% oxalic acid at a temperature of 70°C and a current density of ...

Embodiment 3

[0054] Another embodiment of the ultra-high voltage anode foil corrosion method for aluminum electrolytic capacitors of the present invention includes the following steps:

[0055] 1. Pretreatment:

[0056] The aluminum foil is soaked in a hydrochloric acid solution with a concentration of 5 wt% at 60° C. for 120 seconds and taken out.

[0057] 2. Level 1 DC electrochemical corrosion:

[0058] Put the above-mentioned pre-treated aluminum foil into a mixture of 7.5wt% hydrochloric acid, 35wt% sulfuric acid and 0.35wt% phosphoric acid at a temperature of 75°C and a concentration of 7.5wt% for DC electrochemical corrosion. The current density is 0.35A / cm 2 , The power is 25C / cm 2 .

[0059] 3. Medium processing 1:

[0060] Put the above-mentioned aluminum foil that has undergone the first-level DC electrochemical corrosion into a mixed solution of 2wt% hydrochloric acid and 0.14wt% oxalic acid at a temperature of 78°C and a current density of 0.075A / cm 2 , The power is 5C / cm 2 .

[0061] 4. ...

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Abstract

Disclosed is an ultrahigh voltage anode foil corrosion method for an aluminum electrolytic capacitor. The method comprises steps of conducting pretreatment, conducting first direct current electrochemical corrosion, conducting first middle treatment, conducting second direct current electrochemical corrosion, conducting second middle treatment, conducting third direct current electrochemical corrosion, and conducting post treatment. By the aid of the method, produced anode foil can meet ultrahigh voltage requirements of 800 V to 1000 V, and produced products have the advantages of being low in drain current, quick in boost time and good in mechanical performance.

Description

Technical field [0001] The invention relates to the field of manufacturing anode foils of aluminum electrolytic capacitors, in particular to an ultra-high voltage anode foil corrosion method for aluminum electrolytic capacitors. Background technique [0002] Ultra-high voltage aluminum electrolytic capacitors are widely used in aerospace, automotive frequency converters, industrial frequency converters and other fields and industries because of their high voltage, high energy storage, fast charge and discharge, and low heat generation. At present, there have been reports of ultra-high voltage anode foil corrosion or formation methods in the domestic industry, but the voltage is mostly within 700V. There are few reports or patent applications on the anode foil corrosion process with ultra-high voltage greater than 800V. In domestic electronic materials, ultra-high voltage The aluminum electrolytic capacitor anode foil production process is basically still in a blank, and the resea...

Claims

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Application Information

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IPC IPC(8): H01G9/055
Inventor 宋洪洲蔡小宇熊传勇刘继林
Owner GUANGXI HEZHOU GUIDONG ELECTRONICS TECH
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