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

A technology of aluminum electrolytic capacitors and anode aluminum foil, which is applied in electrolytic capacitors, capacitors, anodizing and other directions, can solve problems such as small capacity, and achieve the effect of increasing capacity and practical process.

Inactive Publication Date: 2010-06-23
YIDU DONGYANGGUANG FORMED FOIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anode aluminum foil for aluminum electrolytic capacitors made by this process has a small capacity

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: A method for forming anode aluminum foil for high-voltage aluminum electrolytic capacitors: Take a high-purity aluminum foil with a purity of 99.99% after corrosion and expansion, and soak it in deionized water at 94°C for 20 minutes. In an aqueous solution of 9% boric acid, 0.3% phosphate and 0.6% ammonium pentaborate, at 85℃, 170V voltage and 100mA / cm 2 One-stage formation under current conditions for 15 minutes; then the aluminum foil is placed in an aqueous solution of 9% boric acid, 0.3% phosphate and 0.4% ammonium pentaborate at a temperature of 85°C, a voltage of 350V and a voltage of 100mA / cm 2 Under the condition of current, the second stage is 15 minutes; then the aluminum foil is placed in an aqueous solution of 9% boric acid and 0.1% ammonium pentaborate at a temperature of 85°C, a voltage of 540V and a voltage of 50mA / cm 2 Three-stage formation under current conditions for 30 minutes; then the aluminum foil is placed in an aqueous solution of 9% bori...

Embodiment 2

[0010] Example 2: A method for forming anode aluminum foil for high-voltage aluminum electrolytic capacitors: take a high-purity aluminum foil with a purity of 99.99% that has been corroded and expanded, and soak it in deionized water at 96°C for 30 minutes. In an aqueous solution of 7% boric acid, 0.2% phosphate and 0.6% ammonium pentaborate, at 85°C, 170V voltage and 100mA / cm 2 One-stage formation under current conditions for 15 minutes; then the aluminum foil is placed in an aqueous solution of 7% boric acid, 0.2% phosphate and 0.4% ammonium pentaborate, at a temperature of 85°C, a voltage of 350V and a voltage of 100mA / cm 2 Under the condition of electric current, the secondary formation is 15 minutes; then the aluminum foil is placed in an aqueous solution of 7% boric acid and 0.1% ammonium pentaborate at a temperature of 85°C, a voltage of 540V and a voltage of 50mA / cm 2 Three-stage formation under current conditions for 30 minutes; then the aluminum foil is placed in an aqu...

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PUM

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Abstract

The invention relates to a formation process of an anode aluminum foil for a high-voltage aluminum electrolytic capacitor, which comprises the following steps sequentially: pretreatment, 100-240V first order formation treatment, 300-450V second order formation treatment, 400-600V third order formation treatment, 500-620V fourth order formation treatment, depolarizing treatment and drying, wherein in the pretreatment step, the aluminum foil after erosion pore expanding is put in de-ionized water of 92-100 DEG C for soaking treatment, and the treating solution of the formation treatment is a mixed water solution of some materials of boric acid, phosphate and ammonium pentaborate. The invention has the beneficial effects that the process is practical and can improve the volume of the anode aluminum foil by 8-10% for the high-voltage aluminum electrolytic capacitor with voltage of 400-650V.

Description

Background technique [0001] Anode aluminum foil for high-voltage aluminum electrolytic capacitors is manufactured through a series of chemical conversion processes such as electrochemical anodic oxidation of high-purity aluminum foil after corrosion and expansion. Prior to this, the formation process of anode aluminum foil for high-voltage aluminum electrolytic capacitors is: First Soak the high-purity aluminum foil after corrosion and expansion in deionized water at 92-100°C for 20-30 minutes, and then conduct a 100-240V primary chemical conversion treatment. Place the aluminum foil in a concentration of 1-10% boric acid and 0.1- In 1% ammonium pentaborate aqueous solution, at 80-95℃ temperature, 100-240V voltage and 50-200mA / cm 2 Formed under current conditions for 15-20 minutes; followed by 300-450V secondary chemical conversion treatment, where the aluminum foil is placed in an aqueous solution of 1-10% boric acid and 0.1-1% ammonium pentaborate at 80-95℃ Temperature, 300-45...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/04H01G9/045
Inventor 邓本委李宝良蒋海波
Owner YIDU DONGYANGGUANG FORMED FOIL
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