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Preparation method of electrode foil for low-voltage aluminum electrolytic capacitor

A technology of aluminum electrolytic capacitors and electrode foils, which is applied in the manufacture of electrolytic capacitors, electrolytic capacitors, capacitors, etc., can solve the problems of not being able to achieve current efficiency, achieve the effects of improving pore efficiency, good mechanical strength, and reducing surface dissolution

Active Publication Date: 2020-07-03
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

However, the starting points of pure sine waves, triangular waves, and improved current waveforms in the prior art are generally at zero current. After power-on, it takes a certain amount of time to break down the passivation film on the surface of the aluminum foil, and then corrode the holes. growth, cannot achieve higher current efficiencies

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  • Preparation method of electrode foil for low-voltage aluminum electrolytic capacitor
  • Preparation method of electrode foil for low-voltage aluminum electrolytic capacitor
  • Preparation method of electrode foil for low-voltage aluminum electrolytic capacitor

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Embodiment approach

[0026] According to the embodiment provided by the present invention, the preparation method of the electrode foil for low-voltage aluminum electrolytic capacitors includes:

[0027] 1) Pre-treatment: soak the aluminum foil in an aqueous solution of 0.1-1 wt.% sodium hydroxide at 30-60°C for 30-90 seconds, and then wash it with water;

[0028] 2) Pore corrosion: put the pretreated aluminum foil in an aqueous solution containing 5-15wt.% hydrochloric acid, 0.01-0.1wt.% sulfuric acid and 0.1-2.0wt.% aluminum chloride solution at 10-50°C Pore ​​corrosion, the current density is 0.1~0.5A / cm 2 , the power-on time is 10-50 seconds, the frequency is 10-40 Hz, the power-on waveform used in the hole corrosion is an offset sine wave whose initial current is not zero and the value of the peak deviation from zero is 0-0.25T, and The peak deviates from the zero point value is not the endpoint value, and then washed;

[0029] 3) Intermediate treatment: put the aluminum foil corroded by th...

Embodiment 1

[0113] 1) Pretreatment: Soak the aluminum foil in an aqueous solution of 1 wt.% sodium hydroxide at 40°C for 80 seconds, then wash it with water at room temperature for 60 seconds;

[0114] 2) Pore corrosion: place the aluminum foil after the above pretreatment in an aqueous solution containing 6wt.% hydrochloric acid, 0.03wt.% sulfuric acid and 1wt% aluminum chloride at 50°C, and the current density is 0.5A / cm 2 , the power-on time is 20 seconds, the frequency is 20Hz, the power-on waveform is an offset sine wave whose current starting point is not zero and the peak deviates from zero with a value of 0.05T, and then washed with water at room temperature for 120 seconds;

[0115] 3) Intermediate treatment: put the above-mentioned aluminum foil corroded by the hole layout in an aqueous solution of potassium dihydrogen phosphate containing 2wt.% at 60°C for intermediate treatment, the treatment time is 80 seconds, and then wash with water at room temperature for 100 seconds;

...

Embodiment 2

[0122] 1) Pretreatment: Soak the aluminum foil in an aqueous solution of 0.4wt.% sodium hydroxide at 60°C for 40 seconds, then wash it with water at room temperature for 60 seconds;

[0123] 2) Pore corrosion: put the aluminum foil after the above pretreatment in 30°C containing 10wt.% hydrochloric acid, 0.06wt.% sulfuric acid and 0.6wt.% aluminum trichloride aqueous solution, and the current density is 0.3A / cm 2 , the power-on time is 40 seconds, the frequency is 30Hz, the power-on waveform is an offset sine wave whose current starting point is not zero and the peak deviates from zero with a value of 0.10T, and then washed with water at room temperature for 180 seconds;

[0124] 3) Medium treatment: put the above-mentioned aluminum foil corroded by the hole layout in an aqueous solution of potassium dihydrogen phosphate containing 6wt.% at 80°C for medium treatment, the treatment time is 80 seconds, and then wash with water at room temperature for 120 seconds;

[0125] 4) De...

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Abstract

The invention provides a preparation method of an electrode foil for a low-voltage aluminum electrolytic capacitor. The method comprises the steps of pretreatment, hole distribution corrosion, intermediate treatment, deep growth corrosion, aftertreatment and drying. A power-up waveform adopted by the hole distribution corrosion is an offset sine wave with the initial current not being zero and thewave crest offset zero value being 0-0.25 T, and the wave crest offset zero value is not an end point value. A power-up waveform adopted by the deep growth corrosion is an offset sine wave of which the initial current is not zero and the wave crest offset zero value is 0-0.5 T, the wave crest offset value during the deep growth corrosion is greater than the hole distribution corrosion, and the wave crest offset zero value is not an endpoint value. T is the period of the standard sine wave. According to the method, new current power-up waveforms are adopted for hole distribution and depth longhole distribution,and corrosion process parameters are matched with one another, on the premise that the thickness of the aluminum foil is not reduced, a corrosion layer uniformly and effectively grows in the depth direction, and the prepared corrosion foil is high in specific volume and good in mechanical strength.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for capacitors, and in particular relates to a method for preparing electrode foils for low-voltage aluminum electrolytic capacitors. Background technique [0002] In recent years, the miniaturization of electronic equipment has required the size of aluminum electrolytic capacitors to be smaller and smaller. Accordingly, electrode foils used have been required to have higher capacitance than before, and the surface area of ​​aluminum foil has been enlarged more efficiently. Aluminum foil for aluminum electrolytic capacitors is usually roughened by chemical or electrochemical corrosion in a corrosive solution containing phosphoric acid, sulfuric acid, nitric acid, oxalic acid, etc. mixed with hydrochloric acid, thereby enlarging the surface area of ​​the aluminum foil. After corrosion, the surface area and capacitance of the aluminum foil increase, but as the etching progresses, the mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045H01G9/00
CPCH01G9/045H01G9/0029
Inventor 方铭清肖远龙闫小宇蒋燕
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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