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Formation method of electrode foil for low voltage low leakage aluminum electrolysis capacitor

A technology of aluminum electrolytic capacitors and chemical formation methods, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problem of high leakage current of electrode foil, achieve the effect of reducing leakage current, simple and practical method, and reduce leakage current

Active Publication Date: 2009-03-11
NANTONG HAIYI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the existing electrode foil formation methods still have disadvantages such as relatively high leakage current of the electrode foil.

Method used

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  • Formation method of electrode foil for low voltage low leakage aluminum electrolysis capacitor

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Embodiment 1

[0021] Embodiment 1 According to the method of the present invention, the formation of electrode foil for low-voltage aluminum electrolytic capacitors comprises the following steps:

[0022] (1) First place the corrosion foil with a purity of 99.99% (wt%) in an aqueous solution of ammonium adipate and 1% (wt%) boric acid at a temperature of 80°C and a concentration of 2.5% (wt%), 50mA / cm 2 Under the current density, an applied voltage of 50V is used for primary formation; and

[0023] (2) At a temperature of 80°C, a concentration of 1.5% (wt%) ammonium adipate and 1.2% (wt%) boric acid aqueous solution, 50mA / cm 2 Under the current density, apply a voltage of 65V for secondary formation;

[0024] (3) Thereafter, place the aluminum foil in a 0.9% (wt%) ammonium dihydrogen phosphate solution at a liquid temperature of 55° C. for 70 seconds;

[0025] (4) In order to repair the defects in the anodized film, the impregnated aluminum foil is first depolarized in a heat treatment ...

Embodiment 2

[0028] A method for forming an electrode foil for a low-voltage low-leakage current aluminum electrolytic capacitor, comprising the following steps:

[0029] (1) First place the corroded foil with a purity of 99.99% in an aqueous solution of 5% ammonium adipate and 1.5% boric acid at a temperature of 80°C and a concentration of 50mA / cm 2 Under the current density, the applied voltage is 50V for one-stage formation, and

[0030] (2) At a temperature of 80°C, in an aqueous solution of 2.0% ammonium adipate and 1.5% boric acid, 50mA / cm 2 Under the current density, apply a voltage of 65V for secondary formation,

[0031] (3) Thereafter, place the aluminum foil in a 1.5% ammonium dihydrogen phosphate solution at a liquid temperature of 65° C. for 60 seconds;

[0032] (4) depolarize the impregnated aluminum foil in a heat treatment furnace at 530° C. for 3 minutes;

[0033] (5) Thereafter, place the depolarized aluminum foil in an aqueous solution of 2.0% ammonium adipate and 1.5...

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Abstract

The invention discloses a formation method of electrode foil for a low-voltage and low leakage current aluminium electrolysis capacitor. The method comprises the following steps: etched foil is put into an ammonium adipate and boric acid aqueous solution at the temperature of 60 to 90 DEG C to carry out first-grade formation and second-grade formation; and after the aluminum foil which carries out the second-grade formation is put into an ammonium biphosphate solution and is dipped, the aluminum foil carries out depolarization treatment and post-formation treatment to form an anode oxide film on the surface of the aluminum foil. The leakage current of the electrode foil for the low-voltage aluminium electrolysis capacitor can be further reduced according to the formation method and can be reduced by 20 to 35 percent. The method of the invention is simple and practical and is easy to implement after being improved on the basis of the prior art and the prior device, the method can produce the electrode foil for the low leakage current and low-voltage aluminium electrolysis capacitor, and the quality of the electrode foil can be increased.

Description

technical field [0001] The invention relates to a method for manufacturing an electrode foil for a capacitor, in particular to a method for manufacturing an electrode foil for a low-voltage aluminum electrolytic capacitor. Background technique [0002] The manufacture of electrode foil for low-voltage aluminum electrolytic capacitors requires the formation of a dense oxide film on the surface of the aluminum foil as the working medium of the capacitor. The method often adopts chemical conversion treatment. The so-called chemical conversion treatment is to treat the metal surface with chemical or electrochemical methods to obtain a coating of metal compounds. The purpose is to improve corrosion resistance, coating adhesion, and metal coloring. and chemical grinding. [0003] In the prior art, the method for forming electrode foils for aluminum electrolytic capacitors is to hydrate the aluminum foil after electrolytic corrosion treatment in pure water, and then hydrate it in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055
Inventor 严季新王建中张传超
Owner NANTONG HAIYI ELECTRONICS
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