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Direct current and pulse superposition corrosion process

A pulse superposition and process technology, applied in the field of aluminum foil corrosion, can solve the problems of easy deformation of corrosion holes, small corrosion holes of anode foil, poor uniformity, etc., and achieve uniform corrosion holes, strong adaptability and excellent mechanical properties. Effect

Pending Publication Date: 2022-03-04
JIANGSU LIFU ELECTRODE FOIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional process uses DC current for porosity corrosion. The anode foil produced has small pits and poor uniformity. When high voltage is formed, the pits are easy to be blocked, and after pitting corrosion and pore expansion corrosion, the corroded holes are easy to deform and block. Therefore, urgently need a kind of improved technology to solve this problem that exists in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A process for direct current and pulse superposition etching, comprising the following steps:

[0029] Step 1: Pretreatment: Put the light foil raw material into a bath solution with a concentration of 20Wt% sulfuric acid, 3Wt% hydrochloric acid, and 1Wt% aluminum ion, and treat it at 60°C for 120Sec;

[0030] Step 2: Pore corrosion: put the aluminum foil after the above pretreatment into a bath solution with a concentration of 30wt% sulfuric acid, 3wt% hydrochloric acid, and 1wt% aluminum ion, and electrolyze at 60°C for 80Sec;

[0031] Step 3: Cleaning: Move the aluminum foil treated in step 2 into an environment of -6°C for 20 sec, and then rinse it with deionized water for 2 min;

[0032] Step 4: Hole expansion corrosion: put the treated aluminum foil into the solution of 5Wt% nitric acid, 0.2-Wt% aluminum ion and 0.01Wt% sodium polystyrene sulfonate solution at 80°C DC power-on treatment for 18 minutes;

[0033] Step 5: post-treatment: put the aluminum foil corro...

Embodiment 2

[0037] A process for direct current and pulse superposition etching, comprising the following steps:

[0038] Step 1: Pretreatment: Put the light foil raw material into a bath solution with a concentration of 30wt% sulfuric acid, 5wt% hydrochloric acid, and 2wt% aluminum ion, and treat it at 70°C for 60Sec;

[0039] Step 2: Pore corrosion: put the aluminum foil after the above pretreatment into a bath solution with a concentration of 50Wt% sulfuric acid, 5Wt% hydrochloric acid, and 2Wt% aluminum ions, and electrolyze at 80°C for 50Sec;

[0040] Step 3: Cleaning: Move the aluminum foil treated in step 2 into an environment of 0°C for 30 sec, and then rinse it with deionized water for 2 min;

[0041] Step 4: Hole expansion corrosion: Put the aluminum foil through the intermediate treatment into the solution of 10Wt% nitric acid, 0.6Wt% aluminum ion and 0.6Wt% polystyrene sodium sulfonate solution in the composition ratio of the bath solution, and direct-flow at 80°C Power on fo...

Embodiment 3

[0046] A process for direct current and pulse superposition etching, comprising the following steps:

[0047] Step 1: Pretreatment: Put the light foil raw material into a bath solution with a concentration of 25wt% sulfuric acid, 3-5wt% hydrochloric acid, and 1.5wt% aluminum ion, and treat it at 65°C for 90Sec;

[0048] Step 2: Pore corrosion: put the aluminum foil after the above pretreatment into a bath solution with a concentration of 40Wt% sulfuric acid, 4Wt% hydrochloric acid, and 1.5Wt% aluminum ion, and electrolyze at 70°C for 60Sec;

[0049] Step 3: Cleaning: Move the aluminum foil treated in step 2 into an environment at -3°C for 25 sec, and then rinse it with deionized water for 3 min;

[0050] Step 4: Hole expansion corrosion: put the treated aluminum foil into the solution of 8wt% nitric acid, 0.4wt% aluminum ion and 0.3wt% polystyrene sodium sulfonate solution in the bath composition ratio, and direct current at 70°C Power on for 15 minutes;

[0051] Step 5: pos...

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PUM

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Abstract

The invention discloses a direct current and pulse superposition corrosion technology which comprises the following steps of pretreatment, hole forming corrosion, cleaning, hole expanding corrosion, aftertreatment, cleaning and drying, in the two cleaning processes, low-temperature environment treatment is conducted firstly, and finally aluminum foil with even corrosion holes and not prone to deformation and blockage is obtained. The method is high in adaptability to change of corrosion tank liquid, generated corrosion holes are uniform and flat, the electrostatic capacity of the corrosion foil is greatly improved, meanwhile, the good mechanical performance is achieved, two-time cleaning is adopted, low-temperature treatment is conducted before cleaning, and the corrosion resistance of the corrosion foil is improved. It is ensured that the aperture of the corroded hole after hole-forming corrosion and hole-expanding corrosion post-treatment is not changed or burrs are not generated any more, and therefore the corroded hole is prevented from being blocked.

Description

technical field [0001] The invention relates to the technical field of aluminum foil corrosion, in particular to a DC and pulse superimposed corrosion process. Background technique [0002] The traditional process uses DC current for porosity corrosion. The anode foil produced has small pits and poor uniformity. When high voltage is formed, the pits are easy to be blocked, and after pitting corrosion and pore expansion corrosion, the corroded holes are easy to deform and block. Therefore, there is an urgent need for an improved technology to solve this problem in the prior art. Contents of the invention [0003] The purpose of the present invention is to provide a direct current and pulse superimposed corrosion process that is highly adaptable to changes in the corrosion bath solution, and the corrosion holes produced are uniform and smooth, greatly improving the electrostatic capacity of the corrosion foil, and at the same time having relatively good mechanical properties...

Claims

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Application Information

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IPC IPC(8): H01G9/055C25F3/04
CPCH01G9/055C25F3/04
Inventor 袁烨袁欣欣杨小东
Owner JIANGSU LIFU ELECTRODE FOIL
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