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Method for Two-Stage Hole Reaming Corrosion of Medium and High Voltage Electronic Aluminum Foil

An electronic aluminum foil, medium and high voltage technology, applied in the direction of circuits, capacitors, electrical components, etc., can solve the problems of decreased specific capacitance, small increase in specific volume of aluminum foil, and insignificant effect of suppressing thinning, so as to improve mechanical strength and obtain foil rate-enhancing effect

Active Publication Date: 2015-11-18
新疆广投桂东电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of the polymer corrosion inhibitor in the corrosion solution has a great influence on the corrosion of aluminum foil hole expansion: the content of the polymer corrosion inhibitor is small, the effect of inhibiting thinning is not obvious, and the specific volume of the aluminum foil is increased slightly; the polymer corrosion inhibitor The content is large, although the thinning of the aluminum foil is inhibited obviously, but because the tunnel hole is strongly suppressed, most of the current enters the hole, and the diameter of the hole is too large, resulting in the occurrence of holes in the hole, which reduces the specific capacitance.

Method used

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  • Method for Two-Stage Hole Reaming Corrosion of Medium and High Voltage Electronic Aluminum Foil

Examples

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no. 1 example

[0026] The first example of the method for two-stage pore expansion corrosion of medium and high voltage electronic aluminum foil described in the present invention comprises the following steps: carrying out the same pretreatment and pore corrosion on the aluminum light foil as in the comparative example, and then putting the pore foil into the temperature 70°C, in a mixed solution containing 3% nitric acid and 2% polyacrylic acid by mass percentage, the applied current density is 100mAcm -2 The direct current was used for the first-stage hole expansion corrosion for 180s, and then it was placed in a mixed solution containing 3% nitric acid and 0.03% polyacrylic acid in a temperature of 70°C, and the applied current density was 100mAcm -2 The direct current is used for second-stage hole expansion corrosion for 540s, and finally the same post-treatment and 520V chemical formation treatment as in the comparative example are carried out.

no. 2 example

[0028] The second example of the method for two-stage hole expansion corrosion of medium and high voltage electronic aluminum foil according to the present invention includes the following steps: carrying out the same pretreatment and hole corrosion on the aluminum light foil as in the comparative example, and then putting the hole foil into the temperature 70°C, in a mixed solution containing 3% nitric acid and 2% polyacrylic acid by mass percentage, the applied current density is 100mAcm -2 The DC current was used for the first-stage hole expansion corrosion for 360s, and then it was placed in a mixed solution containing 3% nitric acid and 0.03% polyacrylic acid at a temperature of 70°C, and the applied current density was 100mAcm -2 The direct current is used for second-stage hole expansion corrosion for 360s, and finally the same post-treatment and 520V chemical formation treatment as in the comparative example are carried out.

no. 3 example

[0030] The third example of the method for two-stage hole expansion corrosion of medium and high voltage electronic aluminum foil according to the present invention includes the following steps: carrying out the same pretreatment and hole corrosion on the aluminum light foil as in the comparative example, and then putting the hole foil into the temperature 70°C, in a mixed solution containing 3% nitric acid and 2% polyacrylic acid by mass percentage, the applied current density is 100mAcm -2 The direct current was used for the first-level hole expansion corrosion for 540s, and then it was placed in a mixed solution containing 3% nitric acid and 0.03% polyacrylic acid at a temperature of 70°C, and the applied current density was 100mAcm -2The direct current is used for the second-stage hole expansion corrosion for 180s, and finally the same post-treatment and 520V chemical formation treatment as in the comparative example are carried out.

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Abstract

The invention relates to a method for reaming and corroding a high-medium-voltage electronic aluminum foil in two levels. The method comprises the following steps that a conical tunnel hole with a large opening and small interior is formed the high-medium-voltage electronic aluminum foil after being pretreated and perforated, the two-level reaming corrosion is adopted, the primary reaming corrosion is anode reaming corrosion which is carried out in a corrosive solution with 0.1 to 5 percent by weight of macromolecular corrosion inhibitor, and the secondary reaming corrosion is the anode reaming corrosion which is carried out in a corrosive solution with 0.01 to 0.1 percent by weight of macromolecular corrosion inhibitor. By adopting the method, the tunnel holes with high consistency in aperture can be obtained, not only can the specific capacitance of the aluminum foil be remarkably improved, but also the corrosion thinning of the aluminum foil can be efficiently inhibited, and the yield and the bending performance of the aluminum foil can be improved.

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 two-stage hole expansion corrosion of medium and high voltage electronic aluminum foil. 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 pretreatment, hole corrosion, 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 length) on the surface of hi...

Claims

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Application Information

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IPC IPC(8): H01G9/055H01G13/06
Inventor 梁力勃何业东宋洪洲杨小飞蔡小宇
Owner 新疆广投桂东电子科技有限公司
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