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A kind of 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, and achieve the effects of improving pore efficiency, reducing dissolution, and high mechanical strength

Active Publication Date: 2022-01-11
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of preparation method of electrode foil for low-voltage aluminum electrolytic capacitor
  • A kind of preparation method of electrode foil for low-voltage aluminum electrolytic capacitor
  • A kind of 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 method for preparing electrode foil for low-voltage aluminum electrolytic capacitors, which includes pretreatment, hole formation corrosion, intermediate treatment, deep growth corrosion, post-treatment and drying. An offset sine wave that is not zero and the value of the peak deviation from zero is 0-0.25T, and the value of the peak deviation from zero is not the endpoint value; the power-on waveform used for the deep growth and corrosion is that the initial current is not zero and the peak deviation from zero An offset sine wave with a value of 0-0.5T, and the peak offset value during deep growth corrosion is greater than that of hole corrosion, and the peak offset value from zero is not the endpoint value; where T is the period of the standard sine wave. The invention adopts new current energization waveforms for hole layout and deep long holes, and at the same time matches the corrosion process parameters. Under the premise that the thickness of the aluminum foil is not thinned, the corrosion layer grows uniformly and effectively in the direction of depth. The corroded foil has high specific volume and good 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 Patents(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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