Method for mfg of anode foil of aluminium electrolytic capacitor

A technology of aluminum electrolytic capacitor and manufacturing method, applied in electrolytic capacitors, capacitor manufacturing, capacitors and other directions, can solve the problems of large leakage current of electrode foil, large leakage current, attenuation of foil capacitance, etc., and achieve large capacitance and water resistance. Good, small leakage current effect

Inactive Publication Date: 2004-03-24
深圳市东阳光化成箔股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this formation method will lead to the attenuation of the foil capacitance, and the leakage current is large
The method of manufacturing anode foil for aluminum electrolytic capacitors disclosed by the Chinese Patent Office with the application number 94103155.1, firstly soaks the corroded foil in pure water at a high temperature of 98°C, and then electrolyzes the foil with organic acids containing aromatic rings and hydrocarbon groups and their salts. However, the electrode foil prepared by this method has a large leakage current and poor water resistance. The electrolytic capacitor made of this electrode foil has a rapid rise in leakage current and cannot Meet the high performance requirements of aluminum electrolytic capacitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A. Boil the corroded foil in pure water for 10 minutes;

[0013] B. Add 0.1g / L hypophosphorous acid to the electrolytic solution of 50g / L boric acid and 0.5g / L ammonium pentaborate at a temperature of 85°C;

[0014] C. Immerse the corroded foil into the above-mentioned electrolytic solution at 20mA / cm 2 After the current density rises to 70V, keep the voltage constant for 10 minutes;

[0015] D. In the same electrolyte, at 20mA / cm 2 After the current density rises to 150V, keep the voltage constant for 10 minutes;

[0016] E. In the same electrolyte, at 20mA / cm 2 After the current density rises to 250V, keep the voltage constant for 40 minutes;

[0017] F. Heat-treat the foil formed above at 500°C for 2 minutes;

[0018] G. In the above electrolyte, 250V is converted into another 10 minutes;

[0019] H, be immersed in the 3% phosphoric acid aqueous solution of 50 ℃ in temperature for 3 minutes;

[0020] I. In the above electrolyte, 250V is converted into 10 minut...

Embodiment 2

[0025] A. Boil the corroded foil in pure water for 10 minutes;

[0026] B. Add 0.2g / L citric acid to the electrolytic solution of 50g / L boric acid and 0.5g / L ammonium pentaborate at a temperature of 85°C;

[0027] C. Immerse the corroded foil into the above-mentioned electrolytic solution at 20mA / cm 2 After the current density rises to 70V, keep the voltage constant for 10 minutes;

[0028] D. In the same electrolyte, at 20mA / cm 2 After the current density rises to 150V, keep the voltage constant for 10 minutes;

[0029] E. In the same electrolyte, at 20mA / cm 2 After the current density rises to 250V, keep the voltage constant for 40 minutes;

[0030] F. Heat-treat the foil formed above at 500°C for 2 minutes;

[0031] G. In the above electrolyte, 250V is converted into another 10 minutes;

[0032] H, be immersed in the 3% phosphoric acid aqueous solution of 50 ℃ in temperature for 3 minutes;

[0033] I. In the above electrolytic solution, 250V is converted into another...

Embodiment 3

[0038] A. Boil the corroded foil in pure water for 10 minutes;

[0039] B. Add 0.08g / L hypophosphorous acid as an active substance and 0.15g / L citric acid as a complexing agent in the chemical formation electrolyte of 50g / L boric acid and 0.5g / L ammonium pentaborate at a temperature of 85°C;

[0040] C. Immerse the corroded foil into the above-mentioned electrolytic solution at 20mA / cm 2 After the current density rises to 70V, keep the voltage constant for 10 minutes;

[0041] D. In the same electrolyte, at 20mA / cm 2 After the current density rises to 150V, keep the voltage constant for 10 minutes;

[0042] E. In the same electrolyte, at 20mA / cm 2 After the current density rises to 250V, keep the voltage constant for 40 minutes;

[0043] F. Heat-treat the foil formed above at 500°C for 2 minutes;

[0044] G. In the above electrolyte, 250V is converted into another 10 minutes;

[0045] H, be immersed in the 3% phosphoric acid aqueous solution of 50 ℃ in temperature for 3 ...

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PUM

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Abstract

This invention relates to a method for manufacturing electrode foils of aluminium electrolytic condensers including pure water boiling, formation, depolarization and reformation in which, the formation liquid electrolyte includes one of solutions of mineral acid containing boric acid or phosphoric acid or organic acid with oxalic acid or their saline material characterizing in adding soppm~5000ppm hypophosphorous acid, phosphorous acid, or their saline materials as the active material added by 100ppm~10000ppm citric acid, tartaric acid or their saline material as the complexant suppressing solution of the foil to reduce attenuation of capacitance.

Description

Technical field [0001] The invention relates to a method for manufacturing electrode foils of aluminum electrolytic capacitors, in particular to a method for forming anode foils for medium and high voltage aluminum electrolytic capacitors. Background technique [0002] The anode foil of an aluminum electrolytic capacitor generally includes pure water boiling, formation, depolarization, and further formation treatment. Usually, the aluminum foil that has been corroded by surface expansion is first hydrated, and then anodized in an aqueous solution containing at least one of boric acid, phosphoric acid, adipic acid and other inorganic acids or organic acids and their salts. Chemical conversion treatment, such as chemical conversion treatment in the chemical conversion electrolyte is a mixed aqueous solution containing 20-100g / L boric acid and 0.2-5g / L ammonium pentaborate, so as to form a layer of γ'- Al 2 o 3 As the dielectric of the capacitor, of course, the chemical conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06H01G9/045H01G9/055
Inventor 吴炜
Owner 深圳市东阳光化成箔股份有限公司
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