CN112941592A - Low-voltage formed foil production process for aluminum electrolytic capacitor - Google Patents
Low-voltage formed foil production process for aluminum electrolytic capacitor Download PDFInfo
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- CN112941592A CN112941592A CN202110115074.XA CN202110115074A CN112941592A CN 112941592 A CN112941592 A CN 112941592A CN 202110115074 A CN202110115074 A CN 202110115074A CN 112941592 A CN112941592 A CN 112941592A
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- foil
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- electrolytic capacitor
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/16—Pretreatment, e.g. desmutting
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/10—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing organic acids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
- H01G9/045—Electrodes or formation of dielectric layers thereon characterised by the material based on aluminium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G9/055—Etched foil electrodes
Abstract
The invention discloses a low-voltage formed foil production process of an aluminum electrolytic capacitor, which comprises the following steps: 1) pretreatment: alkali washing a low-pressure aluminum foil in a sodium hydroxide solution, then, dipping the aluminum foil after the alkali washing in a mixed solution of gamma-butyrolactone and maleic acid, and rinsing the corroded aluminum foil in high-temperature pure water after the acid washing is finished; 2) formation treatment: placing the etched foil subjected to high-temperature rinsing in an ammonium adipate, citric acid and triammonium citrate solution, taking the etched foil as a negative electrode, supplying current to the aluminum foil in a liquid power supply mode, forming into required voltage, then carrying out constant voltage for 3-8 minutes, and then rinsing with pure water; the production process of the low-voltage formed foil of the aluminum electrolytic capacitor has the advantages that the produced product has few impurities, the alumina crystals in the oxide film have compact structure, few defects and low leakage current, and the wavy edge of the low-voltage formed foil can be effectively reduced.
Description
Technical Field
The invention relates to the technical field of aluminum foil production, in particular to a low-voltage foil forming production process of an aluminum electrolytic capacitor.
Background
The electrolytic capacitor is widely applied to many related industries such as electronics, and now, the technological progress and the industrial development make higher requirements on the electrolytic capacitor in the aspects of power frequency, low impedance, long service life, and the like, with the development of the electronics industry, electronic products are more and more miniaturized and portable, so that various electronic components tend to develop in a microminiature direction, the capacitor is no exception, the volume of the aluminum electrolytic capacitor is mainly limited by the electrostatic capacity of an anode foil (namely a formed foil), the higher the electrostatic capacity of the anode foil is, the smaller the volume of the capacitor can be made, the electrostatic capacity of the anode foil is proportional to the dielectric constant and the specific surface area of an anode oxide film and inversely proportional to the thickness of the oxide film, the thickness of the oxide film depends on the working voltage of the capacitor, and according to the requirement of the whole machine, in order to improve the electrostatic capacity of the anode foil, a method of improving the specific surface area of the electrode foil and the dielectric constant of the, the corrosion process technology is a method for improving the specific surface area, after the treatment of the formation process technology, an oxide film with the main component of aluminum oxide is generated on the electrode foil, the dielectric constant of the aluminum oxide film manufactured by the process is 8-10, and the electrostatic capacity and the working voltage of the electrode foil are determined;
the product produced by the existing aluminum electrolytic capacitor low-voltage formed foil production process has more impurities and serious formed foil wavy edges.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a low-voltage formed foil production process for an aluminum electrolytic capacitor, produces products with less impurities, has compact structure among alumina crystals in an oxide film, has less defects and low leakage current, can effectively lighten the wavy edge of the low-voltage formed foil, and can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the low-voltage formed foil production process of the aluminum electrolytic capacitor comprises the following steps:
1) pretreatment: alkali washing a low-pressure aluminum foil in a sodium hydroxide solution, then, dipping the aluminum foil after the alkali washing in a mixed solution of gamma-butyrolactone and maleic acid, and rinsing the corroded aluminum foil in high-temperature pure water after the acid washing is finished;
2) formation treatment: placing the etched foil subjected to high-temperature rinsing in an ammonium adipate, citric acid and triammonium citrate solution, taking the etched foil as a negative electrode, supplying current to the aluminum foil in a liquid power supply mode, forming into required voltage, then carrying out constant voltage for 3-8 minutes, and then rinsing with pure water;
3) and (3) post-treatment: placing the aluminum foil after the formation treatment into an oven for drying, placing the aluminum foil into 1-10% ammonium dihydrogen phosphate for formation treatment after the drying is finished, and then rinsing with pure water;
4) and (3) drying treatment: and (4) putting the post-treated aluminum foil into a drying furnace for drying treatment to obtain a product.
As a preferable technical scheme of the invention, in the step 1), the concentration of the sodium hydroxide solution is 1-10%, and the alkali washing time is 2-5 minutes.
As a preferable technical scheme of the invention, in the step 1), the concentration of the gamma-butyrolactone is 15-30%, the concentration of the maleic acid is 3-6%, and the time of the dipping treatment is 1-4 minutes.
As a preferred technical scheme of the invention, in the step 1), the temperature of the pure water is 95-100 ℃, and the rinsing time is 9-13 minutes.
In a preferred embodiment of the present invention, in step 2), the concentration of ammonium adipate is 1-2%, the concentration of citric acid is 1-2%, and the concentration of triammonium citrate is 1-1.5%.
As a preferred technical scheme of the invention, in the step 2), the current density is 1-50 mA/cm2，The solution temperature of the chemical conversion treatment is 70-90 ℃.
As a preferred technical scheme of the invention, in the step 3), the temperature of the pure water is 100-110 ℃, and the rinsing time of the pure water is 3-5 minutes.
As a preferred technical proposal of the invention, in the step 4), the drying temperature is 200-400 ℃, and the drying time is 5-10 minutes
Compared with the prior art, the invention has the beneficial effects that: the production process of the low-voltage formed foil of the aluminum electrolytic capacitor has the advantages of less product impurities, compact structure between alumina crystals in an oxide film, less defects and low leakage current, and can effectively reduce the wavy edge of the low-voltage formed foil.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
The low-voltage formed foil production process of the aluminum electrolytic capacitor comprises the following steps:
1) pretreatment: alkali washing the low-pressure aluminum foil in a 1% sodium hydroxide solution for 2 minutes, then, dipping the aluminum foil after alkali washing in a mixed solution of 15% gamma-butyrolactone and 3% maleic acid for 1 minute, and rinsing the corroded aluminum foil in high-temperature pure water at the temperature of 95 ℃ for 9 minutes after acid washing;
2) formation treatment: placing the high-temperature rinsed corrosion foil into 1% ammonium adipate, 1% citric acid and 1% triammonium citrate solution, and supplying current to the aluminum foil in a manner of supplying power in the solution by using the corrosion foil as a negative electrode, wherein the current density is 1 mA/cm2，The temperature of the solution for formation treatment is 70 ℃, the voltage required by formation is constant for 3 minutes, and then the solution is rinsed by pure water, the temperature of the pure water is 100 ℃, and the rinsing time of the pure water is 3 minutes;
3) and (3) post-treatment: placing the aluminum foil after the formation treatment into an oven for drying, placing the aluminum foil into ammonium dihydrogen phosphate with the concentration of 1% for the formation treatment after the drying is finished, and then rinsing with pure water;
4) and (3) drying treatment: and (4) putting the post-treated aluminum foil into a drying furnace for drying treatment, wherein the drying temperature is 200 ℃, and the drying time is 5 minutes, so as to obtain the product.
Example two
The low-voltage formed foil production process of the aluminum electrolytic capacitor comprises the following steps:
1) pretreatment: alkali washing the low-pressure aluminum foil in a 5% sodium hydroxide solution for 3 minutes, then, dipping the aluminum foil after alkali washing in a mixed solution of 20% gamma-butyrolactone and 5% maleic acid for 2 minutes, rinsing the corroded aluminum foil in high-temperature pure water after acid washing, wherein the temperature of the pure water is 98 ℃, and the rinsing time is 11 minutes;
2) formation treatment: placing the high-temperature rinsed corrosion foil into 1.5% ammonium adipate, 1.5% citric acid and 1.2% triammonium citrate solution, and using the corrosion foil as a negative electrode to supply current to the aluminum foil in a liquid power supply mode, wherein the current density is 25 mA/cm2，The temperature of the solution for formation treatment is 80 ℃, the voltage required by formation is constant for 6 minutes, and then the solution is rinsed by pure water, wherein the temperature of the pure water is 105 ℃, and the rinsing time of the pure water is 4 minutes;
3) and (3) post-treatment: placing the aluminum foil after the formation treatment into an oven for drying, placing the aluminum foil into 5% ammonium dihydrogen phosphate for the formation treatment after the drying is finished, and then rinsing with pure water;
4) and (3) drying treatment: and (4) putting the post-treated aluminum foil into a drying furnace for drying treatment, wherein the drying temperature is 300 ℃, and the drying time is 8 minutes, so as to obtain the product.
EXAMPLE III
The low-voltage formed foil production process of the aluminum electrolytic capacitor comprises the following steps:
1) pretreatment: alkali washing the low-pressure aluminum foil in a 10% sodium hydroxide solution for 5 minutes, then, dipping the aluminum foil after alkali washing in a mixed solution of 30% gamma-butyrolactone and 6% maleic acid for 4 minutes, rinsing the corroded aluminum foil in high-temperature pure water after the acid washing is finished, wherein the temperature of the pure water is 100 ℃, and the rinsing time is 13 minutes;
2) formation treatment: placing the etched foil subjected to high-temperature rinsing in a solution containing 2% ammonium adipate, 2% citric acid and 1.5% triammonium citrateIn liquid, the corrosion foil is used as a negative electrode, and current is supplied to the aluminum foil in a manner of supplying power in the liquid, wherein the current density is 50 mA/cm2，The temperature of the solution for formation treatment is 90 ℃, the voltage required by formation is constant for 8 minutes, and then the solution is rinsed by pure water, the temperature of the pure water is 110 ℃, and the rinsing time of the pure water is 5 minutes;
3) and (3) post-treatment: placing the aluminum foil after the formation treatment into an oven for drying, placing the aluminum foil into 10% ammonium dihydrogen phosphate for the formation treatment after the drying is finished, and then rinsing with pure water;
4) and (3) drying treatment: and (4) putting the post-treated aluminum foil into a drying furnace for drying treatment, wherein the drying temperature is 400 ℃, and the drying time is 10 minutes, so as to obtain the product.
The product produced by the invention has less impurities, compact structure between alumina crystals in the oxide film, less defects and low leakage current, and can effectively reduce the wavy edge of the low-pressure formed foil.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The low-voltage formed foil production process of the aluminum electrolytic capacitor is characterized by comprising the following steps of: the method comprises the following steps:
1) pretreatment: alkali washing a low-pressure aluminum foil in a sodium hydroxide solution, then, dipping the aluminum foil after the alkali washing in a mixed solution of gamma-butyrolactone and maleic acid, and rinsing the corroded aluminum foil in high-temperature pure water after the acid washing is finished;
2) formation treatment: placing the etched foil subjected to high-temperature rinsing in an ammonium adipate, citric acid and triammonium citrate solution, taking the etched foil as a negative electrode, supplying current to the aluminum foil in a liquid power supply mode, forming into required voltage, then carrying out constant voltage for 3-8 minutes, and then rinsing with pure water;
3) and (3) post-treatment: placing the aluminum foil after the formation treatment into an oven for drying, placing the aluminum foil into 1-10% ammonium dihydrogen phosphate for formation treatment after the drying is finished, and then rinsing with pure water;
4) and (3) drying treatment: and (4) putting the post-treated aluminum foil into a drying furnace for drying treatment to obtain a product.
2. The aluminum electrolytic capacitor low-voltage formed foil production process according to claim 1, characterized in that: in the step 1), the concentration of the sodium hydroxide solution is 1-10%, and the alkali washing time is 2-5 minutes.
3. The aluminum electrolytic capacitor low-voltage formed foil production process according to claim 1, characterized in that: in the step 1), the concentration of the gamma-butyrolactone is 15-30%, the concentration of the maleic acid is 3-6%, and the time for dipping treatment is 1-4 minutes.
4. The aluminum electrolytic capacitor low-voltage formed foil production process according to claim 1, characterized in that: in step 1), the temperature of pure water is 95-100 ℃, and the rinsing time is 9-13 minutes.
5. The aluminum electrolytic capacitor low-voltage formed foil production process according to claim 1, characterized in that: in step 2), the concentration of ammonium adipate is 1-2%, the concentration of citric acid is 1-2%, and the concentration of triammonium citrate is 1-1.5%.
6. The aluminum electrolytic capacitor low-voltage formed foil production process according to claim 1, characterized in that: in the step 2), the current density is 1-50 mA/cm2，The solution temperature of the chemical conversion treatment is 70-90 ℃.
7. The aluminum electrolytic capacitor low-voltage formed foil production process according to claim 1, characterized in that: in step 3), the temperature of the pure water is 100-110 ℃, and the rinsing time of the pure water is 3-5 minutes.
8. The aluminum electrolytic capacitor low-voltage formed foil production process according to claim 1, characterized in that: in the step 4), the drying temperature is 200-400 ℃, and the drying time is 5-10 minutes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110115074.XA CN112941592A (en) | 2021-01-28 | 2021-01-28 | Low-voltage formed foil production process for aluminum electrolytic capacitor |
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| CN202110115074.XA CN112941592A (en) | 2021-01-28 | 2021-01-28 | Low-voltage formed foil production process for aluminum electrolytic capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113921282A (en) * | 2021-09-26 | 2022-01-11 | 内蒙古乌兰察布东阳光化成箔有限公司 | Low-loss formation process for medium-high voltage formed foil for aluminum electrolytic capacitor |
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2021
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| CN111270286A (en) * | 2020-03-11 | 2020-06-12 | 恒扬（韶关）工业有限公司 | Low-voltage formed foil production process for aluminum electrolytic capacitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113921282A (en) * | 2021-09-26 | 2022-01-11 | 内蒙古乌兰察布东阳光化成箔有限公司 | Low-loss formation process for medium-high voltage formed foil for aluminum electrolytic capacitor |
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