Corrosion method for ultra-high-voltage and high-specific-capacity positive electrode corrosion foil

An anode corrosion and ultra-high voltage technology, applied in capacitors, electrolytic capacitors, electrical components, etc., can solve the problems of small corrosion holes, high loss, and easy blockage of anode foils, and achieve the effects of large pore size, moderate density, and high mechanical strength

Inactive Publication Date: 2017-02-15
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for corroding anode foil with ultra-high pressure and high specific volume aimed at the defects and deficiencies of the above-mentioned prior art. low, high loss, etc., and has high mechanical strength under the premise of obtaining high specific capacity and low loss of the anode foil

Method used

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  • Corrosion method for ultra-high-voltage and high-specific-capacity positive electrode corrosion foil
  • Corrosion method for ultra-high-voltage and high-specific-capacity positive electrode corrosion foil
  • Corrosion method for ultra-high-voltage and high-specific-capacity positive electrode corrosion foil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The previous treatment: put the light foil into a sodium hydroxide solution with a concentration of 2wt%, and soak it at 30°C for 120s.

[0043] The first two treatments: put the above-mentioned aluminum foil that has undergone the first treatment into a mixed solution of 1 wt% sulfuric acid and 10 wt% nitric acid, and soak it at 50°C for 180s.

[0044] First-level DC electrochemical corrosion: put the aluminum foil that has undergone the above two treatments into a solution of 30Wt% sulfuric acid, 3Wt% hydrochloric acid, and 1Wt% aluminum ions, and electrolyze at 60°C for 50s, with a current density of 0.6A / cm 2 .

[0045] Intermediate treatment: put the aluminum foil that has undergone the above-mentioned one-stage direct current electrochemical corrosion into a dilute phosphoric acid solution with a concentration of pH=5.0, and soak at 20°C for 300s.

[0046] Secondary direct current electrochemical corrosion: put the aluminum foil treated above into a solution of...

Embodiment 2

[0050] The previous treatment: put the light foil into a sodium hydroxide solution with a concentration of 3wt%, and soak it at 40°C for 90s.

[0051] First-level DC electrochemical corrosion: Put the aluminum foil that has undergone the above two treatments into a solution of 35Wt% sulfuric acid, 4Wt% hydrochloric acid, and 1.5Wt% aluminum ions, electrolyze at 65°C for 60s, and the current density is 0.5A / cm 2 .

[0052] Intermediate treatment: put the aluminum foil that has undergone the above-mentioned first-stage direct current electrochemical corrosion into a sodium bicarbonate solution with a concentration of pH=9.0, and soak at 25°C for 240s.

[0053] Secondary direct current electrochemical corrosion: Put the aluminum foil treated above into a solution of 6wt% nitric acid and 0.3wt% aluminum ion, electrolyze at 70°C for 300s, and the current density is 0.15A / cm 2 .

[0054] Three-stage direct current electrochemical corrosion: put the aluminum foil that has undergo...

Embodiment 3

[0057] The previous treatment: put the light foil into a sodium hydroxide solution with a concentration of 4wt%, and soak it at 50°C for 90s.

[0058] The first two treatments: put the above-mentioned aluminum foil that has undergone the first treatment into a mixed solution of 3 wt% sulfuric acid and 15 wt% nitric acid, and soak it at 60°C for 150s.

[0059] First-level DC electrochemical corrosion: Put the aluminum foil that has undergone the above two treatments into a solution of 40Wt% sulfuric acid, 5Wt% hydrochloric acid, and 1Wt% aluminum ions, and electrolyze it at 70°C for 75s, with a current density of 0.4A / cm 2 .

[0060] Intermediate treatment: put the aluminum foil that has undergone the above-mentioned one-stage direct current electrochemical corrosion into a sodium carbonate solution with a concentration of pH=8.0, and soak at 30°C for 180s.

[0061] Two-stage direct current electrochemical corrosion: put the aluminum foil treated in the above process into a ...

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Abstract

The invention discloses a corrosion method for an ultra-high-voltage and high-specific-capacity positive electrode corrosion foil. The ultra-high-voltage positive electrode corrosion foil is a positive electrode foil used for an aluminium electrolytic capacitor, wherein Vt of the positive electrode foil is greater than or equal to 1,050V; and the corrosion method comprises the following steps of pre-treatment, first-stage corrosion, second-stage corrosion, third-stage corrosion and post-treatment. Through improvement of a corrosion process, corrosion mixed solution prescription and the like, the produced aluminum foil can satisfy the ultra-high-voltage formation requirement with Vt which is greater than or equal to 1,050V; in addition, the shortcoming of low specific capacity caused by high probability of blocking after formation due to small corrosion foil hole in the prior art is also overcome; higher mechanical strength and longer service life are achieved under the premise of obtaining higher pore diameter and static specific capacity; and meanwhile, the produced formation foil is high in stability, low in electric leakage, quick in voltage boosting time, and capable of filling up the blank in the field of the ultra-high-voltage corrosion foil in the prior art.

Description

technical field [0001] The invention relates to a treatment method for an anode foil for an aluminum electrolytic capacitor, in particular to an etching method for an ultra-high voltage anode corrosion foil for an aluminum electrolytic capacitor, and belongs to the field of aluminum electrolytic capacitor manufacturing. Background technique [0002] Due to its high voltage, high energy storage, fast charge and discharge, and low heat generation, ultra-high voltage aluminum electrolytic capacitors are widely required by aerospace, automotive inverters, and industrial inverters and other fields and industries. The main goal of research is to increase the voltage and lower the current of the variable frequency power supply for high-power drive, but in many cases now, multiple capacitors are used in series in the power supply to meet the high voltage requirements. In order to save space, reduce costs, and improve the life and reliability of equipment, manufacturers in the electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045H01G9/055C25F3/04
CPCH01G9/045C25F3/04H01G9/055
Inventor 王洪飞汝英明邓利松
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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