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Production process of low-voltage formed foil of aluminum electrolytic capacitor

A technology of aluminum electrolytic capacitors and production process, which is applied in the direction of electrolytic capacitors, capacitors, electrolytic coatings, etc., which can solve the problems of many impurities in products and serious wavy edges of formed foils, and achieve the effects of less impurities, low leakage current and fewer defects in products

Inactive Publication Date: 2021-06-11
恒扬(韶关)工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing aluminum electrolytic capacitor low-voltage forming foil production process produces products with many impurities, and the forming foil has serious wavy edges.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Aluminum electrolytic capacitor low-voltage forming foil production process, including the following steps:

[0021] 1) Pretreatment: Alkali washing the low-pressure aluminum foil in 1% sodium hydroxide solution for 2 minutes. Dip in a mixed solution of 3% maleic acid for 1 minute. After pickling, rinse the corroded aluminum foil in high-temperature pure water. The temperature of pure water is 95°C and the rinsing time is 9 minute;

[0022] 2) Chemical conversion treatment: place the corroded foil rinsed at high temperature in a solution of 1% ammonium adipate, 1% citric acid and 1% triammonium citrate, and use the corroded foil as a negative electrode. In the way of power supply in the liquid, the current is delivered to the aluminum foil, and the current density is 1mA / ㎝ 2， The temperature of the solution for chemical conversion treatment is 70°C. After the required voltage is formed, the voltage is kept constant for 3 minutes, and then rinsed with pure water. The t...

Embodiment 2

[0026] Aluminum electrolytic capacitor low-voltage forming foil production process, including the following steps:

[0027] 1) Pretreatment: Wash the low-pressure aluminum foil with a concentration of 5% sodium hydroxide solution for 3 minutes, and then wash the aluminum foil with a concentration of 20% gamma-butyrolactone and a concentration of 5% maleic acid mixed solution for immersion treatment, the immersion treatment time is 2 minutes, after the pickling is completed, the corroded aluminum foil is rinsed in high-temperature pure water, the temperature of pure water is 98 ° C, and the rinsing time is 11 minute;

[0028] 2) Chemical conversion treatment: place the corroded foil rinsed at high temperature in ammonium adipate with a concentration of 1.5%, citric acid with a concentration of 1.5% and triammonium citrate with a concentration of 1.2%, and use the corroded foil as a negative electrode. In the way of power supply in the liquid, the current is delivered to the al...

Embodiment 3

[0032] Aluminum electrolytic capacitor low-voltage forming foil production process, including the following steps:

[0033] 1) Pretreatment: the low-pressure aluminum foil is alkali-washed in a sodium hydroxide solution with a concentration of 10%, and the alkali-cleaning time is 5 minutes. 6% maleic acid mixed solution for immersion treatment, the immersion treatment time is 4 minutes, after the pickling is completed, the corroded aluminum foil is rinsed in high-temperature pure water, the temperature of pure water is 100 ° C, and the rinsing time is 13 minute;

[0034] 2) Chemical conversion treatment: place the corroded foil rinsed at high temperature in a solution of 2% ammonium adipate, 2% citric acid and 1.5% triammonium citrate, and use the corroded foil as a negative electrode. In the way of power supply in the liquid, the current is delivered to the aluminum foil, and the current density is 50mA / ㎝ 2， The temperature of the solution for the chemical conversion treatm...

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Abstract

The invention discloses a production process of a low-voltage formed foil of an aluminum electrolytic capacitor. The production process comprises the following steps of 1) pretreatment, specifically, carrying out alkali washing on a low-voltage aluminum foil in a sodium hydroxide solution, then carrying out dipping treatment on the aluminum foil subjected to alkali washing in a gamma-butyrolactone and maleic acid mixed solution, and rinsing the etched aluminum foil in high-temperature pure water after acid washing is completed; and 2) formation treatment, specifically, placing the etched foil rinsed at high temperature in a solution of ammonium adipate, citric acid and triammonium citrate, taking the etched foil as a negative electrode, conveying current to the aluminum foil in a manner of supplying power in the solution, keeping the voltage for 3 minutes-8 minutes after formation, and then rinsing the aluminum foil in pure water. According to the production process of the low-voltage formed foil of the aluminum electrolytic capacitor, the produced product has few impurities, the aluminum oxide crystals in an oxidation film are compact in structure, defects are few, the leakage current is low, and the wavy edge of the low-voltage formed foil can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of aluminum foil production, in particular to a production process of aluminum electrolytic capacitor low-voltage forming foil. Background technique [0002] Electrolytic capacitors are widely used in many related industries such as electronics. Now, technological progress and industrial development have put forward higher requirements for electrolytic capacitors in terms of power frequency, low impedance, and long life. With the development of the electronics industry, electronic products More and more miniaturization and portability, so various electronic components tend to develop in the direction of miniaturization, and capacitors are no exception. The volume of aluminum electrolytic capacitors is mainly restricted by the electrostatic capacity of the anode foil (that is, the formed foil). The higher the electrostatic capacity, the smaller the volume of the capacitor can be made. The electrostatic capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/16C25D11/10H01G9/055H01G9/045
CPCC25D11/16C25D11/10H01G9/055H01G9/045
Inventor 王中浩黄调王建飞徐运雄梁学坚
Owner 恒扬(韶关)工业有限公司
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