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Formation method for anode foil of intermediate-voltage aluminum electrolytic capacitor

A technology of aluminum electrolytic capacitors and formation methods, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems that the technology cannot meet the requirements, and achieve the effects of good hydration resistance, reduced Tr60 value, and reduced boosting time

Inactive Publication Date: 2012-10-03
YONGJI SUHAI ALUMINUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many reports on the domestic research on the formation process, but the aluminum electrolytic capacitor anode foil produced by the existing method still cannot meet the requirements technically.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A method for forming an anode foil of a medium-voltage aluminum electrolytic capacitor is carried out according to the following steps:

[0013] (1) First put the aluminum foil after electrolytic corrosion treatment in pure water with a temperature of 95°C and above, and soak for 5 minutes; The density is 90mA / cm 2 , The formation temperature is 90°C, the formation time is 20 minutes, and the first-grade chemically formed aluminum foil is obtained;

[0014] (2) Put the first-grade chemically formed aluminum foil into an aqueous solution of ammonium adipate with a concentration of 0.04wt%, with a forming voltage of 170V and a current density of 90mA / cm 2 , The formation temperature is 90°C, the formation time is 20 minutes, and the secondary formation aluminum foil is obtained;

[0015] (3) Put the secondary formed aluminum foil into an aqueous solution with a concentration of 0.04wt% ammonium adipate, the formed voltage is 230V, and the current density is 90mA / cm 2 ,...

Embodiment 2

[0018] A method for forming an anode foil of a medium-voltage aluminum electrolytic capacitor is carried out according to the following steps:

[0019] (1) First put the aluminum foil after electrolytic corrosion treatment in pure water with a temperature of 95°C and above, and soak for 12 minutes; The density is 120mA / cm 2 , The formation temperature is 86°C, the formation time is 10 minutes, and the first-grade chemically formed aluminum foil is obtained;

[0020] (2) Put the first-grade chemically formed aluminum foil into an aqueous solution of ammonium adipate with a concentration of 0.01wt%, with a forming voltage of 155V and a current density of 120mA / cm 2 , The formation temperature is 86°C, the formation time is 10 minutes, and the secondary formation aluminum foil is obtained;

[0021] (3) Put the secondary formed aluminum foil into an aqueous solution with a concentration of 0.01wt% ammonium adipate, the formed voltage is 200V, and the current density is 120mA / cm ...

Embodiment 3

[0024] A method for forming an anode foil of a medium-voltage aluminum electrolytic capacitor is carried out according to the following steps:

[0025] (1) First put the aluminum foil after electrolytic corrosion treatment in pure water with a temperature of 95°C and above, and soak for 10 minutes; The density is 100mA / cm 2 , The formation temperature is 88°C, the formation time is 16 minutes, and the first-grade chemically formed aluminum foil is obtained;

[0026] (2) Put the first-grade chemically formed aluminum foil into an aqueous solution of ammonium adipate with a concentration of 0.02wt%, with a forming voltage of 160V and a current density of 100mA / cm 2 , The formation temperature is 88°C, the formation time is 16 minutes, and the secondary formation aluminum foil is obtained;

[0027] (3) Put the secondary formed aluminum foil into an aqueous solution with a concentration of 0.02wt% ammonium adipate, the formed voltage is 220V, and the current density is 100mA / cm ...

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Abstract

The invention discloses a formation method for an anode foil of an intermediate-voltage aluminum electrolytic capacitor, and belongs to the technical field of manufacture of anode foils of aluminum electrolytic capacitors. According to the formation method for the anode foil of the intermediate-voltage aluminum electrolytic capacitor, ammonium adipate is adopted as four-stage formation electrolyte. The technical scheme is that: the method comprises the following steps of: performing three-stage formation by adopting a solution of ammonium adipate as electrolyte, performing the formation of a fourth stage by using a boric acid and ammonium dihydrogen phosphate, performing high-temperature treatment, performing treatment by using a phosphate solution, and performing drying to obtain the anode foil of the intermediate-voltage aluminum electrolytic capacitor. The ammonium adipate is adopted as the formation electrolyte, so that the obtained anode foil of the capacitor is high in specific capacity and high in hydration resistance, boosting time is shortened, and a Tr60 value is decreased.

Description

technical field [0001] The invention discloses a method for forming an anode foil of a medium-voltage aluminum electrolytic capacitor, which belongs to the technical field of manufacturing the anode foil of an aluminum electrolytic capacitor. Background technique [0002] At present, the existing technology usually adds a certain amount of phosphoric acid passivating agent in the post-treatment of the chemical formation process and the post-treatment bath, such as phosphoric acid for chemical post-treatment, that is, after the chemical formation foil reaches the highest formation voltage, it is Soak in phosphoric acid for a certain period of time. During the chemical post-treatment process, phosphoric acid dissolves a part of the aluminum oxide film to form a phosphating film. In addition to using phosphoric acid as the passivation solution, boric acid, citric acid, etc., or salts of these acids are generally used as the electrolyte. There are many reports on the domestic r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055
Inventor 朱苏海徐麦管吕海华关心凯严建华陈兴旺师爱民卫春艳
Owner YONGJI SUHAI ALUMINUM
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