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Manufacturing method of ultra-high-capacity corrosion foil

A manufacturing method and a technology for corroding foils, which are applied in the field of electrode materials for capacitors, can solve the problems affecting the application and development of corroded foils, and reduce the capacity, and achieve the effect of satisfying usage requirements and improving specific volume.

Inactive Publication Date: 2021-12-17
南通南辉电子材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of forming holes, it is very easy to only corrode the surface of the electronic light foil without expanding the holes inward, or merge the holes formed in the early stage, resulting in a decrease in capacity and affecting the application and development of the etched foil.

Method used

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  • Manufacturing method of ultra-high-capacity corrosion foil
  • Manufacturing method of ultra-high-capacity corrosion foil
  • Manufacturing method of ultra-high-capacity corrosion foil

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0027] figure 1 It is a flow chart of a method for manufacturing an ultra-high-capacity corroded foil of the present invention, from which it can be seen that the method for manufacturing an ultra-high-capacity corroded foil of the present invention specifically includes the following steps:

[0028] Step S1: Pretreatment: placing the high-purity aluminum foil in phosphoric acid aqueous solution to remove surface impurities.

[0029] Step S2: Electrochemical corrosion: place the above pretreated foil in 0.55mol / L hydrochloric acid, 3.4mol / L sulfuric acid, 0.45mol / L Al 3+ Soak in the mixed solution at 70°C for 4 minutes.

[0030] Step S3: Pore corrosion: place the above electrochemically etched foil in 0.55mol / L hydrochloric acid, 3.4mol / L sulfuric acid, 0.45mol / L Al 3+ In the mixed solution, at 65°C and a current density of 300mA / cm 2 Under direct current conditions, soak and corrode for 80s.

[0031] Step S4: Hole expansion corrosion: the above-mentioned foil after hole c...

specific Embodiment 2

[0034] figure 1 It is a flow chart of a method for manufacturing an ultra-high-capacity corroded foil of the present invention, from which it can be seen that the method for manufacturing an ultra-high-capacity corroded foil of the present invention specifically includes the following steps:

[0035] Step S1: Pretreatment: placing the high-purity aluminum foil in phosphoric acid aqueous solution to remove surface impurities.

[0036] Step S2: Electrochemical corrosion: place the above pretreated foil in 1.4mol / L hydrochloric acid, 4.0mol / L sulfuric acid, 0.9mol / L Al 3+ Soak in the mixed solution for 2 minutes at 85°C.

[0037] Step S3: Pore corrosion: place the above electrochemically etched foil in 1.4mol / L hydrochloric acid, 4.0mol / L sulfuric acid, 0.9mol / L Al 3+ In the mixed solution, at 80°C and a current density of 400mA / cm 2 Under direct current conditions, soak and corrode for 40s.

[0038] Step S4: Hole expansion corrosion: the above-mentioned foil after hole corro...

specific Embodiment 3

[0041] figure 1 It is a flow chart of a method for manufacturing an ultra-high-capacity corroded foil of the present invention, from which it can be seen that the method for manufacturing an ultra-high-capacity corroded foil of the present invention specifically includes the following steps:

[0042] Step S1: Pretreatment: placing the high-purity aluminum foil in phosphoric acid aqueous solution to remove surface impurities.

[0043] Step S2: Electrochemical corrosion: place the above pretreated foil in 0.75mol / L hydrochloric acid, 3.8mol / L sulfuric acid, 0.45mol / L Al 3+ Soak in the mixture for 2 minutes at 75°C.

[0044] Step S3: Pore corrosion: place the above electrochemically etched foil in 0.75mol / L hydrochloric acid, 3.8mol / L sulfuric acid, 0.45mol / L Al 3+ In the mixed solution, at 72°C and the current density is 350mA / cm 2 Under direct current conditions, soak and corrode for 50s.

[0045] Step S4: Hole expansion corrosion: the above-mentioned foil after hole corros...

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Abstract

The invention relates to the technical field of electrode materials for capacitors, in particular to a manufacturing method of an ultrahigh-capacity corrosion foil. The manufacturing method comprises the following steps of firstly, putting a high-purity aluminum foil into a pretreatment solution, and removing surface impurities; then, soaking in an electrochemical corrosion solution at a certain temperature, and carrying out electrochemical corrosion; next, placing in a hole-forming corrosive liquid under the direct current condition of certain temperature and current density A for soaking and corrosion, and performing hole-forming corrosion; after cleaning, placing in a chambering corrosive liquid containing a macromolecular corrosion inhibitor, and under the direct current condition of certain temperature and current density B, soaking and corroding to perform chambering corrosion; and finally, carrying out post-treatment of washing and drying to obtain the ultrahigh-capacity corrosion foil. According to the manufacturing method, the resistance of electrochemical reaction on the surface of the aluminum foil and near the tunnel orifice can be greatly improved, the reaming process in the hole is accelerated, the specific volume is greatly improved, and the use requirement of the ultra-high-capacity corrosion foil is met.

Description

technical field [0001] The invention relates to the technical field of electrode materials for capacitors, in particular to a method for manufacturing ultra-high capacity corrosion foil. Background technique [0002] The prosperity of the electronic industry has driven the development of the electronic information industry. People's demand for medium and high-end electrolytic capacitor corrosion foil is increasing, which also leads to the short supply of the electrolytic capacitor corrosion foil market. , people urgently demand that the specific capacity of electrolytic capacitors be continuously improved. [0003] Corrosion foil uses electronic light foil as raw material, and etches the electronic light foil inwardly to form holes by electrochemical corrosion method, thereby expanding the effective area and forming a higher specific volume. In the process of forming holes, it is very easy to only corrode the surface of the electronic optical foil without expanding the hole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/04C25F1/00C23F1/20
CPCC25F3/04C25F1/00C23F1/20
Inventor 刑闯陈小兵李晓天
Owner 南通南辉电子材料股份有限公司