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Variable-frequency alternating-current anodic oxidation method for anode aluminum foil for aluminium electrolytic capacitor

An aluminum electrolytic capacitor, anodizing technology, applied in electrolytic capacitors, electrolytic capacitor manufacturing, anodizing and other directions, to achieve the effect of improving compactness, improving production efficiency, and repairing damage

Active Publication Date: 2016-07-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation technology of anode aluminum foil for aluminum electrolytic capacitors mainly adopts the DC anodizing method, and the frequency conversion AC anodizing method of anode aluminum foil has not been reported.

Method used

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  • Variable-frequency alternating-current anodic oxidation method for anode aluminum foil for aluminium electrolytic capacitor
  • Variable-frequency alternating-current anodic oxidation method for anode aluminum foil for aluminium electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Connect the two poles of the variable frequency AC power supply to their respective corroded aluminum foils, and immerse them in 20% ammonium azelate solution at 20°C, at 3V, 5A / cm 2 , Anodizing under the condition of 1000Hz. During the formation process, after the applied voltage increased to 3V, constant voltage anodization was carried out for 20min. Subsequently, the aluminum foil was heat-treated in an air atmosphere at 550° C. for 3 minutes, and then anodized for 2 minutes under the same conditions as above. Through the test, compared with the corroded aluminum foil after DC anodization, under the same withstand voltage, the specific capacitance value increases by 1%, the loss value decreases by 5%, and the production efficiency increases by 85%. The obtained anode aluminum foil leakage current parameter K=0.002μA·V -1 ·µF -1 .

Embodiment 2

[0024] Connect the two poles of the variable frequency AC power supply to their respective corroded aluminum foils, and immerse them in 10% ammonium adipate solution at 90°C, at 20V, 100mA / cm 2 , Anodizing under the condition of 5Hz. During the formation process, after the applied voltage increased to 20V, the constant voltage anodized for 10min. Subsequently, the aluminum foil was heat-treated in an air atmosphere at 550° C. for 3 minutes, and then anodized for 2 minutes under the same conditions as above. Through the test, compared with the corroded aluminum foil after DC anodization, under the same withstand voltage, the specific capacitance value increases by 1%, the loss value decreases by 1%, and the production efficiency increases by 85%. The obtained anode aluminum foil leakage current parameter K=0.005μA·V -1 ·µF -1 .

[0025] see figure 1 , 2 . in figure 1 It is a photograph of the cross-section morphology of the low-pressure corroded aluminum foil obtained by...

Embodiment 3

[0027] Connect the two poles of the variable frequency AC power supply to their respective corroded aluminum foils, immerse them in 1% citric acid solution at 70°C, 2 , Anodizing under the condition of 50Hz. During the formation process, after the applied voltage increased to 50V, constant voltage anodization was carried out for 5min. Subsequently, the aluminum foil was heat-treated in an air atmosphere at 600° C. for 2 minutes, and then anodized for 2 minutes under the same conditions as above. Through the test, compared with the corroded aluminum foil after DC anodization, under the same withstand voltage, the specific capacitance value increases by 2%, the loss value decreases by 5%, and the production efficiency increases by 100%. The obtained anode aluminum foil leakage current parameter K=0.008μA·V -1 ·µF -1 .

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Abstract

The invention discloses a variable-frequency alternating-current anodic oxidation method for an anode aluminum foil for an aluminium electrolytic capacitor and belongs to the technical field of aluminium electrolytic capacitors. According to the adopted technical scheme, the method comprises the following steps: firstly respectively connecting two poles of a variable-frequency alternating-current power source to respective corroded aluminium foils, then immersing to a forming solution for anode oxidation treatment, and after impressed voltage is boosted to set voltage, continuing constant-voltage anode oxidation treatment for 5-20min; and finally, carrying out heat treatment on the aluminium foils subjected to anode oxidation treatment, so as to form an AI2O3 medium film on the surface of the corroded aluminium foils. According to the invention, alternated anode oxidation of the aluminium foils on two poles can be realized by alternation of positive and negative voltages of variable-frequency alternating current; meanwhile, by utilizing the period of the negative voltage of the variable-frequency alternating current, joule heat and oxygen emission caused by anode oxidation can be accelerated, and heat dissolution and internal stress of aluminium oxide can be reduced; and furthermore, during anode oxidation, a dielectric medium achieves repeated polarization under the action of an alternating electric field, thus being favorable for dense arrangement of atoms and improving the compactness of an oxidation film.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolytic capacitors, and in particular relates to a frequency conversion AC anodic oxidation method of anode aluminum foils for aluminum electrolytic capacitors. Background technique [0002] Generally, an aluminum electrolytic capacitor is composed of a corroded and anodized anode aluminum foil, a separator, an electrolyte, and a corroded cathode aluminum foil, wherein the formation of a dielectric film by anodic oxidation is a key step in the preparation of an aluminum electrolytic capacitor. Frequency conversion alternating current has been studied in the fields of electroplating, electrodeposition, electrocorrosion, anodic oxidation, etc., especially in the anodic oxidation of other simple substances and alloys: in 2001, Yung-ChiehChen et al applied pulsed square wave alternating current on silicon wafers After anodic oxidation and rapid heat treatment, it was found that the oxide film ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04C25D11/18H01G9/00
CPCH01G9/0032C25D11/04C25D11/18
Inventor 杜显锋林白阁徐友龙
Owner XI AN JIAOTONG UNIV
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