CN112117128B - High-specific-volume and high-strength medium-high voltage corrosion electrode foil and preparation method and application thereof - Google Patents
High-specific-volume and high-strength medium-high voltage corrosion electrode foil and preparation method and application thereof Download PDFInfo
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- CN112117128B CN112117128B CN202010776769.8A CN202010776769A CN112117128B CN 112117128 B CN112117128 B CN 112117128B CN 202010776769 A CN202010776769 A CN 202010776769A CN 112117128 B CN112117128 B CN 112117128B
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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
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G9/055—Etched foil electrodes
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F3/00—Electrolytic etching or polishing
- C25F3/02—Etching
- C25F3/04—Etching of light metals
Abstract
The invention relates to a high-specific-volume and high-strength medium-high voltage corrosion electrode foil and a preparation method and application thereof. The preparation method comprises the steps of pretreatment, primary direct-current electrolytic corrosion, intermediate treatment 1, secondary direct-current electrolytic corrosion, intermediate treatment 2, tertiary direct-current corrosion and post-treatment, and the medium-high voltage corrosion electrode foil is obtained. The medium-high voltage corrosion foil prepared by the method has high specific capacity, good bending strength, uniform corrosion on the surface of aluminum and high consistency.
Description
Technical Field
The invention belongs to the field of medium and high voltage electrode foils, and particularly relates to a high specific volume and high strength medium and high voltage corrosion electrode foil, and a preparation method and application thereof.
Background
The medium and high voltage anode electronic aluminum foil is a high-end product of aluminum foil and is widely applied to aluminum electrolytic capacitors of electronic components. With the development of electronic products towards volume miniaturization and integration, higher requirements are also put forward on the performance of the aluminum electrolytic capacitor: namely, the volume is reduced as much as possible on the premise of ensuring various electrical properties. Therefore, the research and development of the miniaturization of the aluminum electrolytic capacitor, namely the realization of higher unit electrostatic capacity (specific capacitance), is not only the key for developing high-performance electric products at present, but also the hot spot of high specific volume research. At present, the surface expanding corrosion of the anode aluminum foil is an effective method for improving the specific surface area of the corrosion foil and increasing the specific capacitance; the high-voltage and ultrahigh-voltage corrosion foil is urgently required in the fields of aerospace, vehicle frequency converters, industrial frequency converters and the like, the corrosion electrode foil is a key material for manufacturing the aluminum electrolytic capacitor, and the demand of various high-voltage and high-capacity resistant electrolytic capacitors is increased rapidly along with the continuous demand of the large-scale high-power electronic equipment market. The basic principle of increasing the capacitance of the electrode foil is that corrosive liquid is used for electrochemically generating holes and chambering on the surface of the electrode foil to increase the surface area of the electrode foil, so that the charge storage capacity of the electrode foil is improved, the uniformity and density of the holes and the chambering directly influence the capacitance of the electrode foil, but the bending strength of the electrode foil is not improved due to the fact that the holes are too dense or the chambering is too deep and the aperture is too large. In the prior art at present, holes formed by corrosion are complex in structure, different in depth and uneven in aluminum core, so that bending is promoted, but specific volume cannot meet requirements. For capacitors, the electrode foil is the most important component of the capacitor, and is required to have characteristics such as high strength, low loss, long life, and low leakage current. The electrode foil is etched in an electrochemical method by taking the electronic optical foil as a raw material in the etching process of the electrode foil, so that holes are formed on the surface of the electrode optical foil, the specific surface area of the electrode optical foil is increased, and the etching capacity is improved. In the existing domestic middle-high pressure corrosion foil manufacturing method, the hole expanding process is generally electrochemical hole expanding of mixed solution of nitric acid (hydrochloric acid) and phosphoric acid; electrolyte or electrochemical pore-enlarging electrolyte of mixed solution of nitric acid (hydrochloric acid), phosphoric acid and polyethylene glycol ion active agent. For example, CN101210341 discloses a method for producing a hole-expanding electrolyte and an aluminum electrolytic capacitor electrode foil with high specific surface area; CN101250744 discloses a method for etching an extra-high voltage high specific volume anode foil.
Therefore, the development of a preparation method of the medium-high voltage corrosion electrode foil with high specific volume and high strength has important research significance and economic value.
Disclosure of Invention
The invention aims to overcome the defect or deficiency that the specific volume and the bending performance of the medium-high voltage corrosion electrode foil in the prior art cannot be considered at the same time, and provides a preparation method of the medium-high voltage corrosion electrode foil with high specific volume and high strength. According to the invention, by adjusting the conditions such as the components and the content of the solution (electrolyte) subjected to direct-current electrolytic corrosion at each stage, the holes at the hole forming stage can be conveniently germinated, and the hole uniformity at the hole expanding stage can be improved; in addition, by adding the intermediate treatment process of soaking in phosphoric acid solution between each stage of direct current electrolytic corrosion, the distribution uniformity of aluminum foil corrosion hole-generating tunnel holes can be effectively improved, and excessive ineffective holes are prevented from being generated in the hole expanding process of the aluminum foil, so that the uniform aperture and the hole-forming density in the corrosion process are ensured, and the occurrence probability of self-corrosion in the corrosion process is also reduced.
The invention also aims to provide a medium-high voltage corrosion electrode foil with high specific volume and high strength.
The invention also aims to provide application of the medium-high voltage corrosion electrode foil in preparing a capacitor.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a medium-high voltage corrosion electrode foil with high specific volume and high strength comprises the following steps:
s1, preprocessing the aluminum foil;
s2, primary direct-current electrolytic corrosion: placing the aluminum foil obtained in the step S1 in a mixed solution of sulfuric acid and hydrochloric acid to carry out primary direct-current electrolytic corrosion to obtain a corrosion foil; the mass concentration of sulfuric acid in the mixed solution is 20-40%, and the mass concentration of hydrochloric acid is 0.5-1%;
s3, intermediate process 1: soaking the etched foil obtained in the step S2 in a phosphoric acid solution; the mass concentration of the phosphoric acid solution is 0.1-1%;
s4, secondary direct current electrolytic corrosion: placing the etched foil soaked in the S3 into a mixed solution of nitric acid and phosphoric acid for secondary direct-current electrolytic etching; the mass concentration of nitric acid in the mixed solution is 1-5%, and the mass concentration of phosphoric acid is 0.1-1%;
s5, intermediate process 2: soaking the etched foil obtained in the step S4 in a phosphoric acid solution; the mass concentration of the phosphoric acid solution is 0.1-1%;
s6, three-stage direct current corrosion: placing the etched foil soaked in the S5 into a mixed solution of nitric acid and phosphoric acid for three-stage direct-current etching; the mass concentration of nitric acid in the mixed solution is 1-5%, and the mass concentration of phosphoric acid is 0.1-1%;
and S7, carrying out post-treatment on the etched foil processed in the S6 to obtain the medium-high voltage etched electrode foil.
In the preparation method provided by the invention, grease on the surface of the aluminum foil is removed through pretreatment, pretreatment is carried out before primary hole forming, hole forming is carried out through primary direct-current electrolytic corrosion, hole expansion is carried out through secondary direct-current electrolytic corrosion, holes are adjusted through intermediate treatment, further hole expansion is carried out through tertiary direct-current corrosion, and then post-treatment is carried out, wherein the post-treatment mainly has the function of cleaning residual chloride ions on the surface of the aluminum foil.
According to the invention, researches show that the generation of invalid holes can be effectively prevented by adding the step of soaking in phosphoric acid with specific concentration between the hole forming and the hole expanding and between the hole expanding and further hole expanding, so that the distribution uniformity of aluminum foil corrosion hole forming tunnel holes is effectively improved, excessive invalid holes are prevented from being generated in the hole expanding process, the uniform hole diameter and the hole forming density in the corrosion process are ensured, and the occurrence probability of self-corrosion in the corrosion process is reduced. The reason for this may be that the ineffective holes are shallow and small during the hole opening, and after being soaked in phosphoric acid, the phosphoric acid will be adsorbed on the inner surfaces of the ineffective holes to form a complete and compact film, preventing the hole opening and further hole opening; the holes of the normal hair holes have certain depth and diameter, the inner surfaces of the holes can not form a complete and compact film, and the holes can be normally reamed and further reamed in the subsequent direct-current corrosion; finally, holes with uniform apertures and proper density are obtained, and ineffective holes are greatly reduced.
The medium-high voltage corrosion foil prepared by the method has high specific capacity, good bending strength, uniform corrosion on the surface of aluminum and high consistency.
Any pretreatment conventional in the art can be used in the present invention.
Preferably, the pretreatment process in S1 is: soaking the aluminum foil in an alkali solution; the soaking temperature is 40-45 ℃; the concentration of the alkali solution is 0.3-1%.
More preferably, the alkali solution is a sodium hydroxide solution, a potassium hydroxide solution, a sodium carbonate solution or a potassium carbonate solution.
Preferably, the step of pickling neutralization is further included after the soaking by the alkali solution.
Specifically, the neutralization can be carried out using an acidic solution such as hydrochloric acid.
Preferably, the temperature of the primary direct current electrolytic corrosion in the S2 is 65-75 ℃, and the time is 45-90 seconds.
Preferably, the current density of the primary direct current electrolytic corrosion in S2 is 0.284-0.341A/cm2The electric quantity is 39.4-41.66C/cm2。
Preferably, the soaking time in the S3 is 30-90 seconds, and the soaking temperature is 45-90 ℃.
Preferably, the temperature of the secondary direct current electrolytic corrosion in S4 is 65-75 ℃, and the corrosion time is 4-6 minutes.
Preferably, the current density of the secondary direct current electrolytic corrosion in S4 is 0.0758-0.095A/cm2The electric quantity is 36.36-45.45C/cm2。
Preferably, the soaking time in the S5 is 30-90 seconds, and the soaking temperature is 45-90 ℃.
Preferably, the temperature of the three-stage direct current corrosion in the S6 is 65-75 ℃ and the time is 4-6 minutes.
Preferably, the current density of the three-stage direct current corrosion in S6 is 0.0758-0.095A/cm2The electric quantity is 36.36-45.45C/cm2。
Post-treatments conventional in the art may be used in the present invention.
Preferably, the post-processing in S7 is as follows: and (4) soaking the etched foil treated by the S6 in a nitric acid solution, washing and drying to obtain the medium and high voltage etched electrode foil.
More preferably, the mass concentration of the nitric acid solution is 0.5-3%, and the soaking time is 1-3 minutes.
A medium-high voltage corrosion electrode foil with high specific volume and high strength is prepared by the preparation method.
The application of the medium-high voltage corrosion electrode foil in the preparation of the capacitor is also within the protection scope of the invention.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by adding the intermediate treatment process of soaking in the phosphoric acid solution between each stage of direct current electrolytic corrosion, the uniformity of the distribution of aluminum foil corrosion hole-generating tunnel holes can be effectively improved, and excessive ineffective holes of the aluminum foil in the hole expanding process can be prevented, so that the uniform aperture and the hole-forming density in the corrosion process are ensured, and the occurrence probability of self-corrosion in the corrosion process is reduced.
Detailed Description
The invention is further illustrated by the following examples. These examples are intended to illustrate the invention and are not intended to limit the scope of the invention. Experimental procedures without specific conditions noted in the examples below, generally according to conditions conventional in the art or as suggested by the manufacturer; the raw materials, reagents and the like used are, unless otherwise specified, those commercially available from the conventional markets and the like. Any insubstantial changes and substitutions made by those skilled in the art based on the present invention are intended to be covered by the claims.
The aluminum foils selected for the examples and comparative examples of the present invention had a thickness of 123 μm.
Example 1
The embodiment provides a preparation method of a medium-high voltage corrosion electrode foil with high specific volume and high strength, which comprises the following steps:
(1) pretreatment: the aluminum foil was immersed in a sodium hydroxide solution having a concentration of 0.5% (mass concentration), and then taken out and pickled with an overflow waste liquid (containing hydrochloric acid) from the primary tank.
(2) Primary direct current hair hole corrosion: placing the pretreated aluminum foil into a mixed solution (with the temperature of 70 ℃) of sulfuric acid with the concentration of 30 percent (mass concentration) and hydrochloric acid with the concentration of 0.8 percent (mass concentration) for primary direct-current hole-forming corrosion, wherein the current density is 0.3A/cm2The electric quantity is 40C/cm2The time was 65 seconds.
(3) Intermediate treatment: the aluminum foil corroded by the primary direct current electrolysis pore is placed in a phosphoric acid solution with the concentration of 0.5 percent (mass concentration) for soaking for 65 seconds at the treatment temperature of 60 ℃.
(4) Secondary direct current electrolysis reaming corrosion: then the etched foil after intermediate treatment is placed in a mixed solution of nitric acid with the concentration of 3 percent (mass concentration) and phosphoric acid with the concentration of 0.4 percent (mass concentration) for secondary direct-current electrolytic reaming corrosion, and the current density is 0.08A/cm2The electric quantity is 40C/cm2The temperature was 70 ℃ and the time was 6 minutes.
(5) Intermediate treatment: and (3) soaking the aluminum foil subjected to the secondary direct current electrolytic reaming corrosion in a phosphoric acid solution with the concentration of 0.5% (mass concentration) for 45 seconds at a treatment temperature of 65 ℃.
(6) Rot to be subjected to secondary intermediate treatmentThe etched foil is then put into a mixed solution of nitric acid with the concentration of 3 percent (mass concentration) and phosphoric acid with the concentration of 0.4 percent (mass concentration) for three-stage direct-current hole expanding corrosion, and the current density is 0.08A/cm2The electric quantity is 40C/cm2The temperature was 70 ℃ and the time was 6 minutes.
(7) And (3) placing the aluminum foil subjected to the three-stage direct current reaming corrosion in a nitric acid water solution with the temperature of 50 ℃ and the concentration of 2% (mass concentration) for soaking for 2 minutes, taking out, washing with water, washing with pure water, and drying.
Example 2
The embodiment provides a preparation method of a medium-high voltage corrosion electrode foil with high specific volume and high strength, which comprises the following steps:
(1) pretreatment: the aluminum foil is put into a sodium hydroxide solution with the concentration of 0.5 percent (mass concentration), and is taken out after being soaked and is pickled by overflow waste liquid (containing hydrochloric acid) of a primary tank.
(2) Primary direct current hair hole corrosion: placing the pretreated aluminum foil into a mixed solution (65 ℃) of sulfuric acid with the concentration of 20 percent (mass concentration) and hydrochloric acid with the concentration of 0.5 percent (mass concentration) for primary direct-current hole-forming corrosion, wherein the current density is 0.34A/cm2The electric quantity is 41.6C/cm2The time was 45 seconds.
(3) Intermediate treatment: the aluminum foil corroded by the primary direct current electrolysis pore is placed in a phosphoric acid solution with the concentration of 0.1 percent (mass concentration) for soaking for 90 seconds, and the treatment temperature is 90 ℃.
(4) Secondary direct current electrolysis reaming corrosion: then the etched foil after intermediate treatment is placed in a mixed solution of nitric acid with the concentration of 1 percent (mass concentration) and phosphoric acid with the concentration of 0.1 percent (mass concentration) for secondary direct-current electrolytic reaming corrosion, and the current density is 0.076A/cm2The electric quantity is 36.4C/cm2The temperature was 65 ℃ for 5 minutes.
(5) Intermediate treatment: and (3) soaking the aluminum foil subjected to the secondary direct current electrolytic reaming corrosion in a phosphoric acid solution with the concentration of 0.1% (mass concentration) for 90 seconds at the treatment temperature of 90 ℃.
(6) Placing the etched foil after the secondary intermediate treatment in a concentration of 1% (by mass)Quantitative concentration) of nitric acid and 0.1% (mass concentration) of phosphoric acid, and performing three-stage DC hole expansion corrosion at current density of 0.076A/cm2The electric quantity is 36.4C/cm2The temperature was 65 ℃ for 5 minutes.
(7) And (3) placing the aluminum foil subjected to the three-stage direct current reaming corrosion in a nitric acid water solution with the temperature of 50 ℃ and the concentration of 2% (mass concentration) for soaking for 2 minutes, taking out, washing with water, washing with pure water, and drying.
Example 3
The embodiment provides a preparation method of a medium-high voltage corrosion electrode foil with high specific volume and high strength, which comprises the following steps:
(1) pretreatment: the aluminum foil was immersed in a sodium hydroxide solution having a concentration of 0.5% (mass concentration), taken out, and acid-washed with an overflow waste liquid (containing hydrochloric acid) from the primary tank.
(2) Primary direct current hair hole corrosion: placing the pretreated aluminum foil into a mixed solution (at 75 ℃) of sulfuric acid with the concentration of 40 percent (mass concentration) and hydrochloric acid with the concentration of 1 percent (mass concentration) for primary direct-current pore-forming corrosion, wherein the current density is 0.0285A/cm2The electric quantity is 39.4C/cm2The time was 90 seconds.
(3) Intermediate treatment: the aluminum foil corroded by the primary direct current electrolysis pore is placed in a phosphoric acid solution with the concentration of 1 percent (mass concentration) for soaking for 30 seconds at the treatment temperature of 45 ℃.
(4) Secondary direct current electrolysis reaming corrosion: then the etched foil after intermediate treatment is placed in a mixed solution of nitric acid with the concentration of 5 percent (mass concentration) and phosphoric acid with the concentration of 1 percent (mass concentration) for secondary direct current electrolytic reaming corrosion, and the current density is 0.095A/cm2The electric quantity is 45.4C/cm2The time period was 4 minutes.
(5) Intermediate treatment: and (3) soaking the aluminum foil subjected to the secondary direct current electrolytic reaming corrosion in a phosphoric acid solution with the concentration of 1% (mass concentration) for 30 seconds at the treatment temperature of 45 ℃.
(6) The etched foil subjected to the secondary intermediate treatment is placed again in nitric acid having a concentration of 5% (mass concentration) and in nitric acid having a concentration of 1% (mass concentration)Carrying out three-stage DC reaming corrosion in the mixed solution of phosphoric acid, wherein the current density is 0.095A/cm2The electric quantity is 45.4C/cm2The time period was 4 minutes.
(7) And (3) placing the aluminum foil subjected to the three-stage direct current reaming corrosion in a nitric acid water solution with the temperature of 50 ℃ and the concentration of 2% (mass concentration) for soaking for 2 minutes, taking out, washing with water, washing with pure water, and drying.
Comparative example 1
This comparative example provides a process for producing a medium-high voltage etched electrode foil, which process was identical to example 1 except that steps (3) and (5) were not included.
Comparative example 2
This comparative example provides a process for producing a medium-high voltage etched electrode foil, which process was identical to example 1 except that step (5) was not included.
Comparative example 3
This comparative example provides a process for preparing a medium-to high-voltage etched electrode foil, which process was identical to example 1 except that step (3) was not included.
Performance testing
The specific capacity of 520V was measured according to the test methods of JCC and KDK in Japan, and the test results are shown in Table 1.
TABLE 1 specific value and bending Strength results
(2) Measurement of bending Strength
The 520V bending strength was measured according to the test methods of JCC and KDK in Japan, and the test results are shown in Table 1.
As can be seen from table 1, the present invention: by adopting the two intermediate processing modes of the step (3) and the step (5), the distribution uniformity of aluminum foil corrosion hole-emitting tunnel holes can be effectively improved, excessive invalid holes are prevented from being generated in the hole expanding process of the aluminum foil, the uniform pore diameter and the pore-forming density in the corrosion process are further ensured, and the occurrence probability of self-corrosion in the corrosion process is also reduced, so that the specific volume is improved, and the breaking strength is also improved.
Therefore, the medium-high voltage corrosion foil prepared by the method has high specific volume, good bending strength, uniform corrosion on the surface of aluminum and high consistency.
It will be appreciated by those of ordinary skill in the art that the examples provided herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited examples and embodiments. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (8)
1. A preparation method of a medium-high voltage corrosion electrode foil with high specific volume and high strength is characterized by comprising the following steps:
s1, preprocessing the aluminum foil;
s2, primary direct-current electrolytic corrosion: placing the aluminum foil obtained in the step S1 in a mixed solution of sulfuric acid and hydrochloric acid to carry out primary direct-current electrolytic corrosion to obtain a corrosion foil; the mass concentration of sulfuric acid in the mixed solution is 20-40%, and the mass concentration of hydrochloric acid is 0.5-1%;
s3, intermediate process 1: soaking the corrosion foil obtained in the step S2 in a phosphoric acid solution for 30-90 seconds at 45-90 ℃; the mass concentration of the phosphoric acid solution is 0.1-1%;
s4, secondary direct current electrolytic corrosion: placing the etched foil soaked in the S3 into a mixed solution of nitric acid and phosphoric acid for secondary direct-current electrolytic etching; the mass concentration of nitric acid in the mixed solution is 1-5%, and the mass concentration of phosphoric acid is 0.1-1%;
s5, intermediate process 2: soaking the corrosion foil obtained in the step S4 in a phosphoric acid solution for 30-90 seconds at 45-90 ℃; the mass concentration of the phosphoric acid solution is 0.1-1%;
s6, three-stage direct current corrosion: placing the etched foil soaked in the S5 into a mixed solution of nitric acid and phosphoric acid for three-stage direct-current etching; the mass concentration of nitric acid in the mixed solution is 1-5%, and the mass concentration of phosphoric acid is 0.1-1%;
and S7, carrying out post-treatment on the etched foil processed in the S6 to obtain the medium-high voltage etched electrode foil.
2. The method according to claim 1, wherein the pretreatment in S1 comprises: soaking the aluminum foil in an alkali solution; the soaking temperature is 40-45 ℃; the concentration of the alkali solution is 0.3-1%.
3. The method according to claim 1, wherein the temperature of the primary direct current electrolytic corrosion in S2 is 65-75 ℃ for 45-90 seconds.
4. The preparation method according to claim 1, wherein the temperature of the secondary direct current electrolytic corrosion in S4 is 65-75 ℃ and the corrosion time is 4-6 minutes.
5. The method according to claim 1, wherein the temperature of the third stage DC etching in S6 is 65-75 ℃ and the time is 4-6 minutes.
6. The method according to claim 1, wherein the post-treatment in S7 comprises: and (4) soaking the etched foil treated by the S6 in a nitric acid solution, washing and drying to obtain the medium and high voltage etched electrode foil.
7. A high-specific-volume high-strength medium-high voltage corrosion electrode foil is characterized by being prepared by the preparation method of any one of claims 1 to 6.
8. Use of the medium-high voltage etched electrode foil according to claim 7 for the manufacture of a capacitor.
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| CN114686960B (en) * | 2022-03-01 | 2023-08-22 | 乳源瑶族自治县东阳光化成箔有限公司 | Pretreatment method for preparing medium-high pressure corrosion foil and application thereof |
| CN114540932B (en) * | 2022-03-02 | 2023-09-08 | 南通海星电子股份有限公司 | Technological method for improving uniformity of electrode foil hole forming |
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| CN104505260A (en) * | 2014-12-03 | 2015-04-08 | 东莞市长安东阳光铝业研发有限公司 | Method for preparing mid-high voltage corrosion foil by using pulse DC superposed current |
| WO2019085387A1 (en) * | 2017-11-06 | 2019-05-09 | 南通海星电子股份有限公司 | Pre-treatment method for increasing pore-generation density of electrode foil for aluminum electrolytic capacitor |
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| CN101029413B (en) * | 2006-12-19 | 2010-05-12 | 东莞市东阳光电容器有限公司 | Production of medium-high voltage anode corrosive foil |
| CN100559527C (en) * | 2007-03-28 | 2009-11-11 | 横店集团东磁有限公司 | The caustic solution of high pressure high specific volume anode foil |
| JP2018100438A (en) * | 2016-12-21 | 2018-06-28 | 株式会社Adeka | Surface treatment agent, surface treatment method, and electrode for aluminum electrolytic capacitor |
| CN108456916B (en) * | 2017-12-29 | 2020-07-14 | 广西贺州市桂东电子科技有限责任公司 | Corrosion method of medium-high voltage electronic aluminum foil |
| CN109797424B (en) * | 2018-12-28 | 2021-08-10 | 广西贺州市桂东电子科技有限责任公司 | Method for treating five-level pore formation corrosion of medium-high voltage anode aluminum foil |
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| CN104505260A (en) * | 2014-12-03 | 2015-04-08 | 东莞市长安东阳光铝业研发有限公司 | Method for preparing mid-high voltage corrosion foil by using pulse DC superposed current |
| WO2019085387A1 (en) * | 2017-11-06 | 2019-05-09 | 南通海星电子股份有限公司 | Pre-treatment method for increasing pore-generation density of electrode foil for aluminum electrolytic capacitor |
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