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Anode aluminum corrosion method for media and high voltage aluminum electrolysis capacitor

A technology of aluminum electrolytic capacitors and anode aluminum foil, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of reducing mechanical strength, limiting application fields, reducing the effective surface area of ​​corroded foil, etc., to ensure mechanical strength, high area expansion rate, The effect of specific volume enhancement

Inactive Publication Date: 2009-07-15
横店集团东磁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the previous etching process, the increase in hole density was also accompanied by the dissolution of the surface of the aluminum foil, which not only reduced the effective surface area of ​​the etched foil, but also reduced its mechanical strength, which limited its application field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Pretreatment

[0047] Soak the aluminum foil in a mixed solution of 2.4wt% hydrochloric acid and 31wt% sulfuric acid for 1 minute and take it out at a temperature of 63°C.

[0048] 2. Class I DC corrosion

[0049] Put the pretreated aluminum foil in the mixed solution of 2.4wt% hydrochloric acid and 31wt% sulfuric acid for DC electrolytic corrosion, and the current density is 0.60A / cm 2 , the power is 33C / cm 2 , the temperature is 76°C.

[0050] 3. Secondary direct current corrosion

[0051] Put the aluminum foil that has been corroded by primary direct current in a solution of 3.8wt% hydrochloric acid for direct current electrolytic corrosion, and its current density is 0.08A / cm 2 , the electricity is 55C / cm 2, the temperature is 80°C.

[0052] 4. Post-processing

[0053] The aluminum foil etched by secondary direct current was placed in 5.7wt% nitric acid solution for 4 minutes and then taken out at a temperature of 35°C.

[0054] Formation conditions:

[...

Embodiment 2

[0060] 1. Pretreatment

[0061] Soak the aluminum foil in a mixed solution of 2.6wt% hydrochloric acid and 30wt% sulfuric acid for 2 minutes and take it out at a temperature of 68°C.

[0062] 2. Class I DC corrosion

[0063] Put the pretreated aluminum foil in the mixed solution of 2.6wt% hydrochloric acid and 30wt% sulfuric acid for DC electrolytic corrosion, and the current density is 0.65A / cm 2 , the power is 36C / cm 2 , the temperature is 73°C.

[0064] 3. Secondary direct current corrosion

[0065] Put the aluminum foil that has been corroded by primary direct current in a solution of 3.3wt% hydrochloric acid for direct current electrolytic corrosion, and its current density is 0.10A / cm 2 , the electricity is 67C / cm 2 , the temperature is 75°C.

[0066] 4. Post-processing

[0067] The aluminum foil corroded by the secondary direct current was placed in 8wt% nitric acid solution for 3.5 minutes and then taken out at a temperature of 35°C.

[0068] Formation conditio...

Embodiment 3

[0074] 1. Pretreatment

[0075] Soak the aluminum foil in a mixed solution of 2.8wt% hydrochloric acid and 29.8wt% sulfuric acid for 1 minute and take it out at a temperature of 70°C.

[0076] 2. Class I DC corrosion

[0077] Put the pretreated aluminum foil in the mixed solution of 2.8wt% hydrochloric acid and 29.8wt% sulfuric acid for DC electrolytic corrosion, and the current density is 0.55A / cm 2 , the power is 35C / cm 2 , the temperature is 74°C.

[0078] 3. Secondary direct current corrosion

[0079] Put the aluminum foil that has been corroded by primary direct current in a solution of 3wt% hydrochloric acid for direct current electrolytic corrosion, and the current density is 0.08A / cm 2 , the electricity is 60C / cm 2 , the temperature is 84°C.

[0080] 4. Post-processing

[0081] The aluminum foil etched by secondary direct current was placed in 6.8wt% nitric acid solution for 3 minutes and then taken out at a temperature of 35°C.

[0082] Formation conditions: ...

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Abstract

The present invention relates to an anode aluminum foil corrosion process for middle-and high-voltage aluminum-electrolytic capacitor. The present invention solves the existence technical problems in the prior art such as the mechanical strength is reduced in the anode aluminum foil corrosion process for the high-voltage aluminum-electrolytic capacitor, the invention provides an anode aluminum foil corrosion process which can simultaneously hold the mechanical strength while achieving the prior corrosion affection. The invention has main step of: a pretreatment of soaking the aluminum foil in a mixed solution of 1.5wt%-5wt% of hydrochloric acid and 20wt%-38wt% of sulfuric acid; a first stage direct current corrosion of performing direct current electrolytic corrosion to the aluminum foil after pretreatment in the mixed solution of 1.5wt%-5wt% of hydrochloric acid and 20wt%-38wt% of sulfuric acid; a second stage direct current corrosion of performing direct current electrolytic corrosion to the aluminum foil after first stage direct current corrosion in a 0.5wt%-4wt% hydrochloric acid solution; and a post-processing of putting the aluminum foil after the second stage direct current corrosion in a 2wt%-15wt% of nitric acid solution for immersion.

Description

technical field [0001] The invention relates to an anode aluminum foil corrosion process for medium and high voltage aluminum electrolytic capacitors. Background technique [0002] The anode foil for electrolytic capacitors increases the electrostatic capacity per unit area by enlarging its effective surface area. Generally, the aluminum foil is treated with electrochemical or chemical corrosion. In the previous etching process, the increase in hole density was accompanied by the dissolution of the surface of the aluminum foil, which not only reduced the effective surface area of ​​the etched foil, but also reduced its mechanical strength, which limited its application field. Contents of the invention [0003] The invention solves the technical problems in the prior art that the mechanical strength of the anode aluminum foil used in the high-voltage aluminum electrolytic capacitor is reduced during the corrosion process, and provides a method for the corrosion of the anode...

Claims

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Application Information

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IPC IPC(8): H01G9/045H01G9/055C25F3/04
Inventor 刘裕良金丹君
Owner 横店集团东磁有限公司
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