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Pulse-direct current alternate mixed anodizing method for anode foil for aluminum electrolytic capacitor

A technology of aluminum electrolytic capacitors and mixed anodes, applied in anodizing, electrolytic coatings, surface reaction electrolytic coatings, etc., to achieve the effects of increasing service life, increasing specific capacity, and improving uniformity

Active Publication Date: 2020-01-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, there is no relevant report on the rational combination of the above two methods for the preparation of anode foils.

Method used

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  • Pulse-direct current alternate mixed anodizing method for anode foil for aluminum electrolytic capacitor
  • Pulse-direct current alternate mixed anodizing method for anode foil for aluminum electrolytic capacitor
  • Pulse-direct current alternate mixed anodizing method for anode foil for aluminum electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Connect two pieces of corroded aluminum foil to the positive and negative output terminals of the pulse power supply respectively, immerse in 10% ammonium adipate and 0.04% oxalic acid solution at 85°C, at 10V, 100mA·cm -2 , Continue to oxidize under the condition of 0.5Hz. After the applied voltage rises to 10V, the constant voltage value lasts for 3 minutes. Then the aluminum foil was heat-treated in an air atmosphere at 600°C for 2 minutes, and then heated at 10V, 1mA·cm -2 Under the conditions of DC anodizing, it was formed for 2 minutes.

[0032] Through the test, the specific capacity of the DC sample is increased by 1.1%, the leakage current is reduced by 2.8%, the power consumption is reduced by 11.1%, and the production efficiency is increased by 60%; the specific capacity of the pulse sample is increased by 5% and the leakage current is reduced under the same withstand voltage 46.1%, power consumption is reduced by 9.8%, and production efficiency is increase...

Embodiment 2

[0034] Connect two pieces of corroded aluminum foil to the positive and negative output terminals of the pulse power supply respectively, immerse in 12% ammonium adipate and 0.04% maleic acid solution at 80 °C, and set the temperature at 25V, 100mA·cm -2 , Continue to oxidize under the condition of 2Hz. After the applied voltage rises to 25V, the constant voltage value lasts for 5 minutes. Then the aluminum foil was heat-treated in an air atmosphere at 600°C for 2 minutes, and then heated at 25V, 20mA·cm -2 Under the conditions of DC anodizing, it was formed for 2 minutes.

[0035] Through the test, the specific capacity of the DC sample is increased by 2.5%, the leakage current is reduced by 19.8%, the power consumption is reduced by 21.1%, and the production efficiency is increased by 70%; the specific capacity of the pulse sample is increased by 4% and the leakage current is reduced under the same withstand voltage. 41.2%, power consumption is reduced by 10.4%, and produc...

Embodiment 3

[0038] Connect two pieces of corroded foil to the positive and negative output ends of the pulse power supply respectively, immerse in 20% ammonium adipate and 0.5% ammonium oxalate solution at 75°C, at 51V, 130mA·cm -2, Continue to oxidize under the condition of 5Hz. After the applied voltage rises to 51V, the constant voltage value lasts for 6 minutes. Then the aluminum foil was heat-treated in an air atmosphere of 580°C for 2min, and then heated at 51V, 25mA·cm -2 Under the conditions of direct current anodizing, it was formed for 1min.

[0039] Through the test, the specific capacity of the DC sample is increased by 4.6%, the leakage current is reduced by 13%, the power consumption is reduced by 15%, and the production efficiency is increased by 80%; the specific capacity of the pulse sample is increased by 4% and the leakage current is reduced under the same withstand voltage. 27.2%, power consumption is reduced by 15.5%, and production efficiency is increased by 15%. ...

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Abstract

The invention discloses a pulse-direct current alternate mixed anodizing method for an anode foil for an aluminum electrolytic capacitor. An aluminum oxide dielectric layer which is compact and higherin breakdown field strength resistance is obtained by arranging aluminum oxide atoms tightly by means of a pulse electric field. Polarization of an electrode caused by rapid changes of upper and lower edges of a current pulse in a pulse process can be eliminated under the direct current electric field, so that the withstand voltage of the anode foil is improved and the leak current of the anode foil is reduced. Compared with a direct current or pulse sample, the specific capacity of the anode foil is increased by 1-10%, the leak current is decreased by 10-50% and the production efficiency isincreased by 10-110% in a same voltage resistant condition.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolytic capacitors, and relates to a pulse-direct current alternate mixed anodic oxidation method for anode foils used in aluminum electrolytic capacitors. Background technique [0002] At present, the preparation of anode aluminum foil for aluminum electrolytic capacitors mainly adopts DC anodic oxidation technology. However, in the traditional DC anodization, due to the continuous thickening of the oxide film and the increase of ohmic resistance, the aluminum foil heats up severely, and the thermal dissolution of aluminum oxide increases; 3+ and O 2- migration, resulting in prolonged anodic oxidation time; in addition, side reactions such as oxygen evolution, hydration, and breakdown of the oxide film also occur on the electrode, resulting in low anodic oxidation efficiency. [0003] In recent years, in response to the above problems, the applicant’s research group has innovatively propo...

Claims

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Application Information

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IPC IPC(8): C25D11/08C25D11/10C25D11/12C25D11/18
CPCC25D11/024C25D11/08C25D11/10C25D11/12C25D11/18
Inventor 杜显锋纪亨李响熊礼龙
Owner XI AN JIAOTONG UNIV
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