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Method for ultrasonic-assisted corrosion of middle-high voltage anode aluminum foil

An anode aluminum foil and ultrasonic technology, which is applied to circuits, capacitors, electrolytic capacitors, etc., can solve the problems that the specific capacity of aluminum foil cannot be effectively improved, the length of tunnel holes is uneven, etc., to achieve large-scale industrial production, low cost, Easy-to-use effects

Inactive Publication Date: 2016-03-23
GUANGXI HEZHOU GUIDONG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to the uneven length of the tunnel hole, and the specific volume of the aluminum foil cannot be effectively improved.

Method used

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  • Method for ultrasonic-assisted corrosion of middle-high voltage anode aluminum foil

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Effect test

Embodiment 1

[0032] A method for ultrasonically assisted corrosion of medium and high voltage anode aluminum foil, comprising the following steps:

[0033] (1) Pre-treatment: soak the aluminum foil in a mixed solution containing 3% hydrochloric acid and 35% sulfuric acid by mass percentage for 120s at a temperature of 80°C;

[0034] (2) Ultrasonic-assisted primary porosity corrosion: put the pretreated aluminum foil in a porosity corrosion solution at a temperature of 75°C, and apply a current density of 600mAcm -2 The direct current is carried out porosity corrosion 80s, and supersonic treatment with 25KHz is assisted at the same time of porosity corrosion, and described porosity corrosion solution is the mixed solution that contains mass percent and is 3% hydrochloric acid and 35% sulfuric acid;

[0035] (3) Secondary hole expansion corrosion: put the aluminum foil with holes in it in a hole expansion corrosion solution at a temperature of 70°C, and apply a current density of 100mAcm -2...

Embodiment 2

[0039] A method for ultrasonically assisted corrosion of medium and high voltage anode aluminum foil, comprising the following steps:

[0040] (1) Pretreatment: soak the aluminum foil in a mixed solution containing 0.1% hydrochloric acid and 40% sulfuric acid by mass percentage at a temperature of 40°C for 30 seconds;

[0041] (2) Ultrasonic-assisted primary porosity corrosion: put the pretreated aluminum foil in a porosity corrosion solution at a temperature of 65°C, and apply a current density of 400mAcm -2 direct current for pore corrosion for 30s, assisted with 28KHz ultrasonic treatment while pore corrosion, the pore corrosion solution is a mixed solution containing 1% hydrochloric acid and 40% sulfuric acid in mass percentage;

[0042] (3) Secondary hole expansion corrosion: put the aluminum foil with holes in it in the hole expansion corrosion solution at a temperature of 65°C, and apply a current density of 50mAcm -2 The DC current is used for hole expansion corrosion...

Embodiment 3

[0046]A method for ultrasonically assisted corrosion of medium and high voltage anode aluminum foil, comprising the following steps:

[0047] (1) Pre-treatment: soak the aluminum foil in a mixed solution containing 10% hydrochloric acid and 10% sulfuric acid by mass percentage at 80°C for 180s;

[0048] (2) Ultrasonic-assisted primary porosity corrosion: put the pretreated aluminum foil in a porosity corrosion solution at a temperature of 80°C, and apply a current density of 1000mAcm -2 The direct current is carried out porosity corrosion 180s, and supersonic treatment with 35KHz is assisted at the same time of porosity corrosion, and described porosity corrosion liquid is the mixed solution that contains mass percent and is 10% hydrochloric acid and 20% sulfuric acid;

[0049] (3) Secondary hole expansion corrosion: put the aluminum foil with holes in it in a hole expansion corrosion solution at a temperature of 85°C, and apply a current density of 200mAcm -2 The direct curr...

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Abstract

The invention relates to the technical field of corrosion of anode foil for aluminum electrolytic capacitors, in particular to a method for ultrasonic-assisted corrosion of middle-high voltage anode aluminum foil. The method comprises the four steps of pretreatment, ultrasonic-assisted first-stage hole forming corrosion, second-stage hole expansion corrosion and aftertreatment. In the process of first-stage hole forming corrosion, ultrasonic treatment with the frequency of 20-40 KHz is used for assisting. By means of the method, the hole forming density of the corrosion foil and length consistency of tunnel holes can be increased, and the specific volume of the corrosion foil is relatively increased by more than 10%. The method is simple in process, convenient to operate and capable of achieving large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of anode foil corrosion for aluminum electrolytic capacitors, in particular to a method for ultrasonically assisted corrosion of medium and high voltage anode aluminum foils. Background technique [0002] Miniaturization is an inevitable trend in the development of aluminum electrolytic capacitors. Electrolytic corrosion of high-purity aluminum foil with {100} texture to expand its specific surface area and increase specific capacitance is the most effective technical approach for the miniaturization of aluminum electrolytic capacitors. [0003] At present, the electrolytic corrosion process of medium and high pressure aluminum foil generally includes four steps: pretreatment, primary hole corrosion, secondary hole expansion corrosion, and posttreatment. The key to obtain high specific capacitance is to form evenly distributed tunnel holes with high density and reasonable size (aperture diameter and pore len...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/04H01G9/055
CPCC25F3/04H01G9/055
Inventor 杨小飞蔡小宇梁力勃蒋碧君
Owner GUANGXI HEZHOU GUIDONG ELECTRONICS TECH
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