Manufacturing method of producing high-purity cathode foil by virtue of electrochemical corrosion

A manufacturing method and high-purity technology, applied in capacitor electrodes, circuits, capacitors, etc., can solve problems such as low production efficiency and complicated process, and achieve the effects of simplified production process, reduced process flow, and good mechanical properties

Active Publication Date: 2015-04-01
GUANGDONG HUAFENG NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems that the existing production process of high-purity negative electrode foil is relatively complex and the production efficiency is low,

Method used

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  • Manufacturing method of producing high-purity cathode foil by virtue of electrochemical corrosion

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The pure aluminum-based aluminum foil (up to 99.8%) is pretreated (primary corrosion overflow solution) at a temperature of 20°C, and the action time: 90s. In a 60°C corrosion solution with 0.5mol / L aluminum chloride, the applied current density is 0.15A / cm 2 Under the conditions of primary corrosion for 10s, followed by surface chemical corrosion treatment, the temperature is 30°C, the action time is 80s, and then put into the 60°C corrosion solution with a total acidity of 3.0mol / L and an aluminum chloride of 0.5mol / L, and apply Current density: first level 0.02A / cm 2 , Level 2 0.05A / cm 2 , Level 3 0.08A / cm 2 , level 4 0.11A / cm 2 , level 5 0.13A / cm 2 , Level 6 0.18A / cm 2 , carry out staged corrosion for 50s, and finally process the treatment temperature is 60 ℃, the action time is 50s and post-treatment temperature is 70 ℃, the action time is 40s.

Embodiment 2

[0019] The pure aluminum-based aluminum foil (up to 99.8%) is pretreated (primary corrosion overflow liquid) at a temperature of 30°C, and the action time: 80s. In a 50°C corrosion solution with 0.8mol / L aluminum chloride, the applied current density is 0.18A / cm 2 Under the conditions of primary corrosion for 10s, followed by surface chemical corrosion treatment, the temperature is 40°C, the action time is 70s, and then put into the 50°C corrosion solution with a total acidity of 3.5mol / L and an aluminum chloride of 1.2mol / L, and apply Current density: first level 0.04A / cm 2 , Level 2 0.07A / cm 2 , Level 3 0.09A / cm 2 , level 4 0.11A / cm 2 , level 5 0.15A / cm 2 , Level 6 0.18A / cm 2 , carry out staged corrosion for 45s, the final in-process treatment temperature is 50°C, and the action time is 60s; the post-treatment temperature is 60°C, and the action time is 50s.

Embodiment 3

[0021] The pure aluminum-based aluminum foil (up to 99.8%) is pretreated (primary corrosion overflow solution) at a temperature of 40°C, and the action time: 70s. In a 40°C corrosion solution with 1.0mol / L aluminum chloride, the applied current density is 0.20A / cm 2 Under the condition of primary corrosion for 10s, followed by surface chemical corrosion treatment, the temperature is 50°C, the action time is 60s, and then it is put into a 40°C corrosion solution with a total acidity of 4.0mol / L and an aluminum chloride of 0.7mol / L. Current density: first level 0.05A / cm 2 , Level 2 0.07A / cm 2 , Level 3 0.09A / cm 2 , level 4 0.12A / cm 2, level 5 0.15A / cm 2 , Level 6 0.20A / cm 2 , carry out staged corrosion for 40s, and finally process the treatment temperature is 40 ℃, the action time is 70s and post-treatment temperature is 50 ℃, the action time is 60s.

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Abstract

The invention relates to a manufacturing method of producing a high-purity cathode foil by virtue of electrochemical corrosion and belongs to the technical field of manufacturing aluminum foils. The manufacturing method comprises the following technological process steps: pretreatment, primary corrosion, multi-stage corrosion, middle treatment, post-treatment, foil rewinding by drying and the like, wherein the multi-stage corrosion is the core of the whole process, is the key process for high specific capacitance and is a process of continuous electrolytic corrosion by virtue of different current densities, generally corrosion by virtue of 3-6 different alternating currents; during the multi-stage corrosion, the current densities change from small to large, the phenomena of powder dropping and polarization are avoided in the continuous electrochemical corrosion, and the production efficiency is relatively high. With the adoption of the manufacturing method, the produced high-purity cathode foil is low in content of impurity, the phenomenon of leakage current is relatively reduced as for an electrolytic capacitor, the production process is simplified, and the technological process is reduced due to the continuous electrochemical corrosion.

Description

technical field [0001] The invention relates to a method for manufacturing negative electrode foil, in particular to a method for producing high-purity negative electrode foil by electrochemical corrosion, and belongs to the technical field of aluminum foil manufacturing. Background technique [0002] Since its appearance in 1930, aluminum electrolytic capacitors have been widely used in the capacitor industry due to their excellent performance, reliable quality, mature technology, and low cost, making them widely used in radio components. occupy a considerable proportion. It is estimated that the output value of aluminum electrolytic capacitors accounts for more than 50% of the output value of capacitors of the same type. [0003] With the rapid development of electronic technology, the assembly density and integration of electronic machines are further increased, and new requirements are put forward for aluminum electrolytic capacitors. It is urgent to further reduce the ...

Claims

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Application Information

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IPC IPC(8): C25F3/04H01G9/04H01G9/045H01G9/055
Inventor 陈乾钧梁锦华钟思敏谭惠忠冯秀群
Owner GUANGDONG HUAFENG NEW ENERGY TECH CO LTD
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