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Anode foil corrosion process for aluminum electrolytic capacitor

A technology for aluminum electrolytic capacitors and anode foils, applied in electrolytic capacitors, electrolytic capacitor manufacturing, capacitors, etc., can solve the problems of tunnel hole length and poor uniformity of hole diameter, large taper of corrosion holes, unfavorable electrode foil capacity, etc.

Active Publication Date: 2020-07-07
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional electrochemical porosity process, the mass transfer process in the tunnel hole is slow, and the corrosion product Al 3+ It is easy to enrich and hydrolyze to form a passivation film in the tunnel hole, and the growth of corrosion holes is hindered, resulting in poor tunnel hole length and uniformity of hole diameter, large corrosion hole taper, and a large number of transverse branch holes, which eventually lead to poor mechanical properties of the corroded foil. It is not conducive to the improvement of electrode foil capacity

Method used

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  • Anode foil corrosion process for aluminum electrolytic capacitor
  • Anode foil corrosion process for aluminum electrolytic capacitor
  • Anode foil corrosion process for aluminum electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Pretreatment: use high-purity aluminum foil produced by Dongyang Guangguang, with an aluminum content of ≥99.99% and a cubic texture of >95%. 3 PO 4 After soaking in the solution for 60s, rinse with deionized water.

[0055] (2) First-order porosity corrosion: the above-mentioned pretreated aluminum foil is heated in 3wt%HCl+30wt%H 2 SO 4 +20mMEDTA-2Na in aqueous solution for primary corrosion, corrosion time is 60s, current density is 0.6A / cm 2 , the temperature is 70°C, after the corrosion is completed, it is cleaned with deionized water to obtain a first-grade corroded foil with pores;

[0056] (3) Secondary hole-expanding corrosion: the first-level hole-corroding foil is exposed to 7wt% HNO 3 Corrosion in the solution for 500s, the current density is 0.15A / cm 2 , the temperature is 70°C, and after the etching is completed, it is cleaned with deionized water to obtain a secondary hole expansion corrosion foil;

[0057] (4) post-corrosion treatment: immerse ...

Embodiment 2

[0059] (1) Pretreatment: use high-purity aluminum foil produced by Dongyang Guangguang, with an aluminum content of ≥99.99% and a cubic texture of >95%. 3 PO 4 After soaking in the solution for 60s, rinse with deionized water.

[0060] (2) First-order porosity corrosion: the above-mentioned pretreated aluminum foil is heated in 3wt%HCl+30wt%H 2 SO 4 +40mMEDTA-2Na aqueous solution for primary corrosion, corrosion time is 60s, current density is 0.6A / cm 2 , the temperature is 70°C, after the corrosion is completed, it is cleaned with deionized water to obtain a first-grade corroded foil with pores;

[0061] (3) Secondary hole-expanding corrosion: the first-level hole-corroding foil is exposed to 7wt% HNO 3 Corrosion in the solution for 500s, the current density is 0.15A / cm 2 , the temperature is 70°C, and after the etching is completed, it is cleaned with deionized water to obtain a secondary hole expansion corrosion foil;

[0062] (4) post-corrosion treatment: immerse the...

Embodiment 3

[0064] (1) Pretreatment: use high-purity aluminum foil produced by Dongyang Guangguang, with an aluminum content of ≥99.99% and a cubic texture of >95%. 3 PO 4 After soaking in the solution for 60s, rinse with deionized water.

[0065] (2) First-order porosity corrosion: the above-mentioned pretreated aluminum foil is heated in 3wt%HCl+30wt%H 2 SO 4 Carry out primary corrosion in +36mM gluconic acid aqueous solution, the corrosion time is 60s, and the current density is 0.6A / cm 2 , the temperature is 70°C, after the corrosion is completed, it is cleaned with deionized water to obtain a first-grade corroded foil with pores;

[0066] (3) Secondary hole-expanding corrosion: the first-level hole-corroding foil is exposed to 7wt% HNO 3 Corrosion in the solution for 500s, the current density is 0.15A / cm 2 , the temperature is 70°C, and after the etching is completed, it is cleaned with deionized water to obtain a secondary hole expansion corrosion foil;

[0067] (4) post-corro...

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Abstract

The invention provides an anode foil corrosion process for aluminum electrolytic capacitors, including pretreatment, first-level porosity corrosion, second-level hole expansion corrosion, and post-treatment. A complexing agent is added to the corrosion solution for the first-level porosity corrosion. The complexing agent is a carboxylic acid compound or a salt thereof. The carboxylic acid-containing compound or its salt complexing agent can be combined with the free Al in the corrosion solution 3+ Combining to improve Al in the tunnel hole 3+ The mass transfer process prevents it from being enriched in the tunnel hole and hydrolyzed to form a passivation film, which significantly improves the consistency of the corrosion hole depth of the corroded foil, reduces lateral branch holes, and improves the capacity and bending performance of the electrode foil.

Description

technical field [0001] The invention relates to the technical field of anode foils for capacitors, in particular, the invention relates to an corrosion process for anode foils for aluminum electrolytic capacitors. [0002] technical background [0003] Aluminum electrolytic capacitors are widely used in the fields of electronic energy-saving lamps, electronic power circuits, and vehicles. Large capacity, long life, high temperature resistance, low impedance" has become the development trend of aluminum electrolytic capacitors. Electrode foil is the key material for the production of aluminum electrolytic capacitors. The performance of the electrode foil largely determines the capacity, volume, leakage current, loss, life and other key technical indicators of aluminum electrolytic capacitors. Anode foils for aluminum electrolytic capacitors generally use electrochemical corrosion to form tunnel holes on the surface of the aluminum foil with a certain depth and perpendicular t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/055
CPCH01G9/055H01G9/045H01G9/0032
Inventor 张霞何凤荣曹文亮肖远龙向云刚
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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