Electrochemical corrosive process of anode aluminum foil

An anode aluminum foil, electrochemical technology, applied in the direction of capacitor electrodes, capacitor parts, etc., can solve the problems of unsuitability for high-voltage aluminum electrolytic capacitors, poor mechanical strength of aluminum foil, inconvenient operation and management, etc., and achieve uniform appearance and improved mechanical strength , good water resistance

Inactive Publication Date: 2007-09-05
DONGGUAN HEC CONDENSER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But also because of the particularity of this hole structure, it is not suitable for high-voltage aluminum electrolytic capacitors, and the mechanical strength of aluminum foil is poor
[0006] Japanese Patent Laid-Open No. 2005-203530 discloses an etching method for increasing the specific volume and strength of the anode aluminum foil, but the process flow and mechanical equipment are complicated, the investment is large and the operation and management are inconvenient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Use a specific type of electronic optical foil with an aluminum content greater than 99.9% and a cubic texture greater than 98%. After proper pretreatment to remove the grease on the surface of the foil, perform two electrochemical corrosions: the first electrochemical corrosion solution The mass percentage of sulfuric acid in the medium is 30%, the chloride ion is added in the form of hydrochloric acid, the mass percentage is 4.0%, the solution temperature is 75.0°C, and the current density applied on the aluminum foil is 0.50A / cm 2 . The mass percentage of chloride ions in the second electrochemical corrosion solution is 6.0%, the added ATMP mass percentage is about 0.61%, the solution temperature is 85°C, and the current density applied on the aluminum foil is 0.10A / cm 2 .

Embodiment 2

[0022] Use a specific type of electronic optical foil with an aluminum content greater than 99.9% and a cubic texture greater than 98%. After proper pretreatment to remove the grease on the surface of the foil, perform two electrochemical corrosions: the first electrochemical corrosion solution The mass percentage of sulfuric acid in the medium is 30%, the chloride ion is added in the form of ammonium chloride, its mass percentage is 5.9%, the solution temperature is 75.0°C, and the current density applied on the aluminum foil is 0.50A / cm 2 . The mass percentage of chloride ions in the second electrochemical corrosion solution is 6.0%, the added HEDP mass percentage is about 0.42%, the solution temperature is 85°C, and the current density applied on the aluminum foil is 0.10A / cm 2 .

Embodiment 3

[0024] Use a specific type of electronic optical foil with an aluminum content greater than 99.9% and a cubic texture greater than 98%. After proper pretreatment to remove the grease on the surface of the foil, perform two electrochemical corrosions: the first electrochemical corrosion solution The mass percentage of sulfuric acid in the medium is 30%, the chloride ion is added in the form of sodium chloride, its mass percentage is 6.4%, the solution temperature is 75.0°C, and the current density applied on the aluminum foil is 0.50A / cm 2 . The mass percentage of chloride ions in the second electrochemical corrosion solution is 6.0%, the added EDTMP mass percentage is about 0.94%, the solution temperature is 85°C, and the current density applied on the aluminum foil is 0.10A / cm 2 .

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Abstract

An electrochemical corrosion technology for anode aluminum foils consists of two DC electrochemical corrosion processes. The first electrochemical corrosion process is carried out in mixed solution sulfuric acid, chlorine ion and aluminum ion; the second electrochemical corrosion process is carried out by adding into organic phosphonic acid or phosphate, ATMP, HEDP and EDTMP. It has homogenous appearance, large capacity ration, excellent mechanical strength and water-proof performance.

Description

technical field [0001] The invention belongs to a method for manufacturing an anode aluminum foil for medium and high voltage aluminum electrolytic capacitors. Background technique [0002] With the rapid development of electronic technology, the trend of miniaturization of electronic complete machines has continued, and the volume of aluminum electrolytic capacitors, one of the most important components of various complete machines, is also required to be reduced accordingly. Among them, the most important factor restricting the size reduction of aluminum electrolytic capacitors is the specific capacitance of the core raw material - anode aluminum foil. [0003] Chinese patent CN85101035 discloses a method for surface-expanding corrosion of high-voltage anode aluminum foil. In the second corrosion process of the patent, direct current is not applied, but a mixed solution of nitric acid and aluminum nitrate is used for pure chemical corrosion. Due to the serious erosion of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/04H01G9/04
Inventor 李建霖
Owner DONGGUAN HEC CONDENSER CO LTD
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