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Pre-treating process for high-voltage aluminum foil corrosion

A technology of anode aluminum foil and pretreatment liquid, applied in electrical components, electrolytic capacitors, capacitors, etc., can solve problems such as small specific volume, achieve good mechanical strength, and improve the effect of corrosion area expansion rate

Inactive Publication Date: 2009-05-06
DONGGUAN HEC CONDENSER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese Patent Publication No. is CN1458658, and the patent application document titled "Electrolytic Capacitor Anode Aluminum Foil Corrosion Process" discloses a pretreatment scheme for aluminum foil corrosion. The patent uses alkali or acid as pretreatment or mixed acid or mixed alkali as pretreatment When adding a certain concentration of zinc or lead in the pretreatment, the area expansion rate and tensile strength of the aluminum foil are partially improved, but the specific volume is still small

Method used

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  • Pre-treating process for high-voltage aluminum foil corrosion
  • Pre-treating process for high-voltage aluminum foil corrosion

Examples

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Embodiment 1

[0018] Example 1 is to place the aluminum foil at a temperature of 40°C, a concentration of 5.0% sodium hydroxide (NaOH) and 0.005% bismuth nitrate (Bi(NO 3 ) 3 ) in the pretreatment solution for 120 seconds, and then carry out the usual porosity corrosion, hole expansion corrosion and post-treatment.

Embodiment 2

[0019] Embodiment 2 is to place the aluminum foil at a temperature of 80°C and a concentration of 5.0% sulfuric acid (H 2 SO 4 ) and 0.005% indium nitrate (In(NO 3 ) 3 ) in the pretreatment solution for 120 seconds, and then carry out the usual porosity corrosion, hole expansion corrosion and post-treatment.

Embodiment 3

[0020] Embodiment 3 is that aluminum foil is placed in temperature and is 70 ℃, concentration 5.0% phosphoric acid (H 3 PO 4 ) and 0.005% bismuth nitrate (Bi(NO 3 ) 3 ) in the pretreatment solution for 120 seconds, and then carry out the usual porosity corrosion, hole expansion corrosion and post-treatment.

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Abstract

The invention relates to the technical field of electrolytic capacitors, in particular to a pretreatment technology of high-voltage anode aluminum foil corrosion, which mainly comprises the following steps: 0.001-0.025 percent bismuth-containing or indium-containing compound or bismuth and indium mixture by weight is added in treatment fluid of alkali, acid, mixed alkali or mixed acid; aluminum foil is placed in pretreatment fluid and soaked for 10-200 seconds under the temperature of 30-80 DEG C; and the even pitting corrosion of the aluminum foil can happen easily when the pitting corrosion happens as the precipitation of the bismuth or the indium from the surface of the aluminum foil, thereby not only the face expansion ratio of the anode aluminum foil is improved, but also the loss of the mechanism strength can not be caused, and the specific volume of the aluminum foil is greatly improved.

Description

Technical field: [0001] The invention relates to the technical field of electrolytic capacitors, in particular to a pretreatment process for high-voltage anode aluminum foil corrosion. Background technique: [0002] The anode foil of the aluminum electrolytic capacitor is high-purity aluminum foil. The capacitance of the capacitor is proportional to the real surface area of ​​the capacitor electrode material. The larger the real surface area per unit apparent area of ​​the capacitor electrode material, the greater the capacitance. In order to make the anode aluminum foil have a larger real surface area and reduce the volume of the capacitor to meet the needs of miniaturization of electronic equipment, people have been constantly exploring ways to obtain a larger real surface area of ​​the anode aluminum foil. [0003] At present, the high-voltage anode foil for electrolytic capacitors is generally treated by electrochemical corrosion to form tunnel holes with high density, u...

Claims

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Application Information

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IPC IPC(8): H01G9/045H01G9/055C25F3/04
Inventor 汪俊锋
Owner DONGGUAN HEC CONDENSER CO LTD
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