CN113192754A - Control method of aluminum formed foil voltage withstanding value for aluminum electrolytic capacitor - Google Patents
Control method of aluminum formed foil voltage withstanding value for aluminum electrolytic capacitor Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 55
- 239000011888 foil Substances 0.000 title claims abstract description 47
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 28
- 239000003990 capacitor Substances 0.000 title claims abstract description 21
- 239000000126 substance Substances 0.000 claims abstract description 61
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 113
- 238000006243 chemical reaction Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 74
- 239000000243 solution Substances 0.000 description 41
- 238000005406 washing Methods 0.000 description 31
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 22
- 239000000203 mixture Substances 0.000 description 17
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 11
- 238000001035 drying Methods 0.000 description 11
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 description 8
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 235000019837 monoammonium phosphate Nutrition 0.000 description 8
- 230000008439 repair process Effects 0.000 description 8
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 7
- 239000004327 boric acid Substances 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 7
- OTRAYOBSWCVTIN-UHFFFAOYSA-N OB(O)O.OB(O)O.OB(O)O.OB(O)O.OB(O)O.N.N.N.N.N.N.N.N.N.N.N.N.N.N.N Chemical compound OB(O)O.OB(O)O.OB(O)O.OB(O)O.OB(O)O.N.N.N.N.N.N.N.N.N.N.N.N.N.N.N OTRAYOBSWCVTIN-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000010306 acid treatment Methods 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- FLDCSPABIQBYKP-UHFFFAOYSA-N 5-chloro-1,2-dimethylbenzimidazole Chemical compound ClC1=CC=C2N(C)C(C)=NC2=C1 FLDCSPABIQBYKP-UHFFFAOYSA-N 0.000 description 2
- 239000001741 Ammonium adipate Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 235000019293 ammonium adipate Nutrition 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000008367 deionised water Substances 0.000 description 2
- 229910021641 deionized water Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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, LIGHT-SENSITIVE OR TEMPERATURE-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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention relates to a control method of an aluminized foil withstand voltage value for an aluminum electrolytic capacitor. A control method of the withstand voltage value of an aluminized foil for an aluminum electrolytic capacitor is as follows: the voltage of the last-stage chemical forming tank for forming the main body oxide film in the chemical forming process is controlled to control the voltage withstanding value of the aluminum chemical foil. According to the control method of the withstand voltage value of the aluminized formed foil for the aluminum electrolytic capacitor, the detection point of the forming voltage of the withstand voltage value is adjusted to the cathode and foil surface of the last-stage forming tank formed by the oxide film main body from the cathode and foil surface of the traditional repairing tank, and the point with the largest influence on the withstand voltage value is skillfully positioned, so that the withstand voltage value is controlled, the problem of unstable withstand voltage value control is solved, and the influence of capacity, vehicle speed and the like is avoided.
Description
Technical Field
The invention belongs to the technical field of formed foil, and particularly relates to a method for controlling the withstand voltage value of formed foil for an aluminum electrolytic capacitor.
Background
Electrolytic capacitors are widely used in many related industries such as electronics. The technological progress and the industrial development put higher demands on the electrolytic capacitor in terms of power frequency, low impedance, long service life and the like. The volume of the aluminum electrolytic capacitor is mainly limited by the electrostatic capacity of the anode foil (i.e., formed foil). The higher the electrostatic capacity of the anode foil, the smaller the volume of the capacitor can be made. In order to increase the electrostatic capacity of the anode foil, a method of increasing the specific surface area of the electrode foil and the dielectric constant of the oxide film is generally used.
The conventional capacitor anode foil generally adopts the following processing technology: firstly, a corrosion process, namely placing the aluminum foil with the surface subjected to decontamination treatment in a corrosion tank for electro-corrosion to form compact micropores on the surface of the aluminum foil so as to increase the specific surface area of the anode foil; and secondly, a formation process, namely immersing the corrosion foil obtained by the corrosion process into the electrolyte in the formation process, applying a certain current on the anode, and performing oxidation reaction on the surface of the corrosion foil at a certain temperature to form an oxide film dielectric layer. In the conventional formation process, a multi-stage formation mode is usually adopted to gradually increase the thickness of the formed oxide film, and phosphoric acid treatment, high-temperature treatment and re-formation processes are performed during the process.
In the conventional anode foil formation, boric acid, adipic acid, citric acid, phosphoric acid, hypophosphorous acid or salts of the acids are mostly adopted as the electrolyte to prepare the electrolyte, and a plurality of limitations of the formation process conditions are added. In the production of a formed foil for an aluminum electrolytic capacitor, the method of controlling the withstand voltage is relatively fixed, and the final withstand voltage is controlled by adjusting the forming voltage with the potential difference between the negative electrode of the final stage power supply and the foil surface after being discharged from the drying oven being Vfe (forming voltage).
However, this method of controlling the withstand voltage value has a problem that the withstand voltage value control is unstable, such as: the capacity of the raw material corrosion foil fluctuates, the raw material corrosion foil is fixed Vfe and the pressure resistance value fluctuates; the pressure resistance value fluctuates by adjusting the vehicle speed; the product specification changes and the appropriate Vfe needs to be fumbled again.
In view of the above, the present invention provides a novel method for controlling the formed foil withstand voltage value for an aluminum electrolytic capacitor, which is directed to the problem that even Vfe fluctuation in the Vfe (forming voltage) control method of the formed foil withstand voltage value for an aluminum electrolytic capacitor can cause fluctuation in the withstand voltage value.
Disclosure of Invention
The invention aims to provide a method for controlling the withstand voltage value of an aluminized formed foil for an aluminum electrolytic capacitor, which adopts more accurate control, reduces the fluctuation of applied voltage caused by the fluctuation of capacity, the fluctuation of vehicle speed and the like by accurately controlling the real voltage for forming an oxide film in the formation production, quickly and accurately controls the withstand voltage value of the formed foil, and can be directly used in the formation production.
In order to realize the purpose, the adopted technical scheme is as follows:
a control method of the withstand voltage value of an aluminized foil for an aluminum electrolytic capacitor is as follows: the voltage of the last-stage chemical forming tank for forming the main body oxide film in the chemical forming process is controlled to control the voltage withstanding value of the aluminum chemical foil.
Further, the control method comprises the following steps: before the restoration chemical conversion treatment, a conductive roller is added in a chemical conversion groove with the main body oxide film basically formed, and the voltage between conductive electrode plates of the chemical conversion groove is a forming voltage.
And the voltage forming detection point is the cathode and foil surface of the last-stage forming groove formed by the main body oxide film.
Further, the formation process is a multi-stage formation process.
Compared with the prior art, the invention has the beneficial effects that:
the technical scheme of the invention is based on the control key point deduced from the oxide film forming and repairing theory, the final voltage formed by the oxide film main body determines the basis of the voltage withstanding value, and the universal voltage applied by the control and repair tank is adjusted to the voltage applied by the control and repair tank, which is irrelevant to the voltage applied by the repair oxide film. Therefore, the pressure resistance value of the product is stably controlled, the problems that the pressure resistance value is too low to meet the technological requirements and the power consumption loss and the capacity loss are caused by too high pressure resistance value are solved, and the control capability can be improved.
Drawings
FIG. 1 is a schematic diagram showing a change in the pressure resistance value detection position.
Detailed Description
In order to further illustrate the method for controlling the voltage withstanding value of the formed aluminum foil for the aluminum electrolytic capacitor according to the present invention, and achieve the intended purpose of the invention, the following detailed description will be made with reference to the preferred embodiments of the method for controlling the voltage withstanding value of the formed aluminum foil for the aluminum electrolytic capacitor according to the present invention. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The method for controlling the withstand voltage of the formed aluminum foil for the aluminum electrolytic capacitor according to the present invention will be described in detail with reference to the following embodiments:
in combination with the generation characteristic of the withstand voltage, the formation process includes a first-stage heat treatment (or acid treatment) and the subsequent steps are called as a destruction and repair process. The former formation step is referred to as a process of forming the oxide film main body, and the final breakdown voltage is also derived from this. The voltage difference between the cathode of the last stage power supply and the position after the last stage power supply is taken out of the drying box is changed into the potential difference between the last stage power supply and the position before or after the first heat treatment (or acid treatment) as a control point (as shown in figure 1). The control repair voltage is changed into the final voltage formed by the oxide film main body, so that the fluctuation of the withstand voltage value caused by the capacity fluctuation, the vehicle speed adjustment and the like can be avoided.
The technical scheme of the invention is as follows:
a control method of the withstand voltage value of an aluminized foil for an aluminum electrolytic capacitor is as follows: the voltage of the last-stage chemical forming tank for forming the main body oxide film in the chemical forming process is controlled to control the voltage withstanding value of the aluminum chemical foil.
Preferably, the control method is as follows: before the restoration chemical conversion treatment, a conductive roller is added in a chemical conversion groove with the main body oxide film basically formed, and the voltage between conductive electrode plates of the chemical conversion groove is a forming voltage.
Further preferably, the voltage forming detection point is a cathode and a foil surface of a final-stage forming groove formed by the main oxide film.
Preferably, the formation process is a multi-stage formation process.
Example 1.
The specific operation steps are as follows:
(1) soaking the etched foil in deionized water at 90 deg.C or above for 10 min, taking out, placing in a first-stage formation tank containing 2.0% boric acid and 0.1% ammonium adipate water solution, and treating at 85 deg.C and 0.25mA/cm2Under the condition of 100V, the formation lasts for 8 minutes, and after the first-stage formation is finished, the water is flushed;
(2) then placing in a second stage chemical tank, and treating with the same water solution as the first stage chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 220V, the formation lasts for 8 minutes, and after the secondary formation is finished, the washing is carried out by running water;
(3) then placing in a third-stage formation tank containing 4.0% boric acid and 0.1% ammonium pentaborate water solution at 85 deg.C and 0.25mA/cm2Under the condition of 350V, the formation lasts for 12 minutes, and after the third-level formation is finished, the water is flushed;
(4) then placing the mixture in a fourth-stage chemical tank, wherein the tank is an aqueous solution containing 5.0 percent of boric acid and 0.05 percent of ammonium pentaborate, and the temperature is 85 ℃ and the mA/cm is 0.252Under the condition of 510V, the formation is carried out for 24 minutes, and after the four-stage formation is finished, the water is flushed;
(5) and (3) heat treatment: heat-treating in a high temperature furnace at 500 deg.C for 2 min;
(6) taking out, placing in a fifth stage formation tank, treating with the same water solution as the fourth stage formation tank at 85 deg.C and 0.25mA/cm2Under the condition of 510V, the formation lasts for 4 minutes, and after the five-level formation is finished, the water is flushed;
(7) then placing the mixture in 35g/L phosphoric acid solution, carrying out washing for 10 minutes at 65 ℃, and after the treatment is finished, washing with running water;
(8) then placing in a sixth chemical tank, and treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 510V, the formation lasts for 4 minutes, and after the six-level formation is finished, the washing is carried out by running water;
(9) and (3) heat treatment: heat-treating in a high temperature furnace at 500 deg.C for 2 min;
(10) taking out, placing in a seventh chemical tank, treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 510V, the formation lasts for 4 minutes, and after the five-level formation is finished, the water is flushed;
(11) then placing the mixture into 2% ammonium dihydrogen phosphate solution, carrying out normal temperature treatment for 4 minutes, washing with running water after the treatment is finished, and drying.
Example 2.
The specific operation steps are as follows:
(1) before the fifth stage formation, the same treatment procedure as in example 1 was carried out, and the resultant was taken out and placed in a fifth stage formation tank, and the same aqueous solution as in the fourth stage formation tank was heated at 85 ℃ and 0.25mA/cm2Under the condition of 500V, the formation lasts for 4 minutes, and after the five-level formation is finished, the water is flushed;
(2) then placing the mixture in 35g/L phosphoric acid solution, carrying out washing for 10 minutes at 65 ℃, and after the treatment is finished, washing with running water;
(3) then placing in a sixth chemical tank, and treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 500V, the formation lasts for 4 minutes, and after the six-level formation is finished, the washing is carried out by running water;
(4) then heat-treating for 2 minutes in a high temperature furnace at 500 ℃;
(5) taking out and placing in a seventh chemical tank to be in contact with a fourth chemical tankThe same aqueous solution, 0.25mA/cm at 85 DEG C2Under the condition of 500V, the formation lasts for 4 minutes, and after the five-level formation is finished, the water is flushed;
(6) then placing the mixture into 2% ammonium dihydrogen phosphate solution, carrying out normal temperature treatment for 4 minutes, washing with running water after the treatment is finished, and drying.
Example 3.
The specific operation steps are as follows:
(1) before the fifth stage formation, the same treatment procedure as in example 1 was carried out, and the resultant was taken out and placed in a fifth stage formation tank, and the same aqueous solution as in the fourth stage formation tank was heated at 85 ℃ and 0.25mA/cm2Under the condition of 515V, the formation is carried out for 4 minutes, and after the five-level formation is finished, the water is flushed;
(2) then placing the mixture in 35g/L phosphoric acid solution, carrying out washing for 10 minutes at 65 ℃, and after the treatment is finished, washing with running water;
(3) then placing in a sixth chemical tank, and treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 515V, the formation is carried out for 4 minutes, and after the six-level formation is finished, the water is flushed;
(4) then heat-treating for 2 minutes in a high temperature furnace at 500 ℃;
(5) taking out, placing in a seventh chemical tank, treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 515V, the formation is carried out for 4 minutes, and after the five-level formation is finished, the water is flushed;
(6) then placing the mixture into 2% ammonium dihydrogen phosphate solution, carrying out normal temperature treatment for 4 minutes, washing with running water after the treatment is finished, and drying.
Example 4.
The specific operation steps are as follows:
(1) before the fifth stage formation, the same treatment procedure as in example 1 was carried out, and the resultant was taken out and placed in a fifth stage formation tank, and the same aqueous solution as in the fourth stage formation tank was heated at 85 ℃ and 0.25mA/cm2Under the condition of 520V, the formation is carried out for 4 minutes, and after the five-level formation is finished, the water is flushed;
(2) then placing the mixture in 35g/L phosphoric acid solution, carrying out washing for 10 minutes at 65 ℃, and after the treatment is finished, washing with running water;
(3) then placing in a sixth chemical tank, and treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 520V, the formation lasts for 4 minutes, and after the six-level formation is finished, the washing is carried out by running water;
(4) then heat-treating in a high temperature furnace at 520 ℃ for 2 minutes;
(5) taking out, placing in a seventh chemical tank, treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 520V, the formation is carried out for 4 minutes, and after the five-level formation is finished, the water is flushed;
(6) then placing the mixture into 2% ammonium dihydrogen phosphate solution, carrying out normal temperature treatment for 4 minutes, washing with running water after the treatment is finished, and drying.
Example 5.
The specific operation steps are as follows:
(1) soaking the etched foil in deionized water at 90 deg.C or above for 10 min, taking out, placing in a first-stage formation tank containing 2.0% boric acid and 0.1% ammonium adipate in water solution, and treating at 85 deg.C and 0.25mA/cm2Under the condition of 100V, the formation lasts for 8 minutes, and after the first-stage formation is finished, the water is flushed;
(2) then placing in a second stage chemical tank, and treating with the same water solution as the first stage chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 220V, the formation lasts for 8 minutes, and after the secondary formation is finished, the washing is carried out by running water;
(3) then placing in a third-stage formation tank containing 4.0% boric acid and 0.1% ammonium pentaborate water solution at 85 deg.C and 0.25mA/cm2Under the condition of 350V, the formation lasts for 12 minutes, and after the third-level formation is finished, the water is flushed;
(4) then placing in a fourth chemical tank containing 5.0% boric acid and 0.05% ammonium pentaborate water solution at 85 deg.C and 0.25mA/cm2Under the condition of 515V, the formation is carried out for 24 minutes, and after the four-stage formation is finished, the water is flushed;
(5) high-temperature treatment: heat-treating in a high temperature furnace at 500 deg.C for 2 min;
(6) taking out, placing in a fifth stage formation tank, treating with the same water solution as the fourth stage formation tank at 85 deg.C and 0.25mA/cm2Under the condition of 515V, the formation is carried out for 4 minutes, and after the five-level formation is finished, the water is flushed;
(7) then placing the mixture in 35g/L phosphoric acid solution, carrying out washing for 10 minutes at 65 ℃, and after the treatment is finished, washing with running water;
(8) then placing in a sixth chemical tank, and treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 515V, the formation is carried out for 4 minutes, and after the six-level formation is finished, the water is flushed;
(9) then heat-treating for 2 minutes in a high temperature furnace at 500 ℃;
(10) taking out, placing in a seventh chemical tank, treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 515V, the formation is carried out for 4 minutes, and after the five-level formation is finished, the water is flushed;
(11) then placing the mixture into 2% ammonium dihydrogen phosphate solution, carrying out normal temperature treatment for 4 minutes, washing with running water after the treatment is finished, and drying.
Example 6.
The specific operation steps are as follows:
(1) before the fifth stage formation, the same treatment procedure as in example 1 was carried out, and the resultant was taken out and placed in a fifth stage formation tank, and the same aqueous solution as in the fourth stage formation tank was heated at 85 ℃ and 0.25mA/cm2Under the condition of 505V, the formation lasts for 4 minutes, and after the five-level formation is finished, the water is flushed;
(2) then placing the mixture in 35g/L phosphoric acid solution, carrying out washing for 10 minutes at 65 ℃, and after the treatment is finished, washing with running water;
(3) then placing in a sixth chemical tank, and treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 505V, the formation time is 4 minutes, and after the six-level formation is finished, the water is flushed;
(4) then heat-treating for 2 minutes in a high temperature furnace at 505 ℃;
(5) taking out, placing in a seventh chemical tank, treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 500V, the formation lasts for 4 minutes, and after the five-level formation is finished, the water is flushed;
(6) then placing the mixture into 2% ammonium dihydrogen phosphate solution, carrying out normal temperature treatment for 4 minutes, washing with running water after the treatment is finished, and drying.
Example 7.
The specific operation steps are as follows:
(1) before the fifth stage formation, the same treatment procedure as in example 1 was carried out, and the resultant was taken out and placed in a fifth stage formation tank, and the same aqueous solution as in the fourth stage formation tank was heated at 85 ℃ and 0.25mA/cm2Under the condition of 520V, the formation is carried out for 4 minutes, and after the five-level formation is finished, the water is flushed;
(2) then placing the mixture in 35g/L phosphoric acid solution, carrying out washing for 10 minutes at 65 ℃, and after the treatment is finished, washing with running water;
(3) then placing in a sixth chemical tank, and treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 520V, the formation lasts for 4 minutes, and after the six-level formation is finished, the washing is carried out by running water;
(4) then heat-treating for 2 minutes in a high temperature furnace at 500 ℃;
(5) taking out, placing in a seventh chemical tank, treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 520V, the formation is carried out for 4 minutes, and after the five-level formation is finished, the water is flushed;
(6) then placing the mixture into 2% ammonium dihydrogen phosphate solution, carrying out normal temperature treatment for 4 minutes, washing with running water after the treatment is finished, and drying.
Example 8.
The specific operation steps are as follows:
(1) before the fifth stage formation, the same treatment procedure as in example 1 was carried out, and the resultant was taken out and placed in a fifth stage formation tank, and the same aqueous solution as in the fourth stage formation tank was heated at 85 ℃ and 0.25mA/cm2Under the condition of 525V, the formation is carried out for 4 minutes, and after the five-level formation is finished, the water is flushed;
(2) then placing the mixture in 35g/L phosphoric acid solution, carrying out washing for 10 minutes at 65 ℃, and after the treatment is finished, washing with running water;
(3) then placing in a sixth chemical tank, and treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 525V, the formation lasts for 4 minutes, and after the six-level formation is finished, the washing is carried out by running water;
(4) then heat-treating in a high temperature furnace at 520 ℃ for 2 minutes;
(5) taking out, placing in a seventh chemical tank, treating with the same water solution as the fourth chemical tank at 85 deg.C and 0.25mA/cm2Under the condition of 525V, the formation is carried out for 4 minutes, and after the five-level formation is finished, the water is flushed;
(6) then placing the mixture into 2% ammonium dihydrogen phosphate solution, carrying out normal temperature treatment for 4 minutes, washing with running water after the treatment is finished, and drying.
The pressure resistance values and capacity indexes of the samples produced by different methods in examples 1-8 are compared, and are shown in Table 1.
TABLE 1
As can be seen from table 1, in the system in which Vfe of the cell for the repair process is separately controlled, the repair cell control voltage is determined by the final voltage for the oxide film main body regardless of the final breakdown voltage.
In the present invention, in the formation process, a conductive roller is added to a guide roller of a formation tank before the formation of the entire oxide film is substantially completed, that is, a conductive electrode plate of the formation tank in which the formation of the oxide film is substantially completed is tested to obtain a formation voltage. The detection point of the formation voltage of the withstand voltage value is adjusted to the cathode and the foil surface of the last-stage chemical tank formed by the oxide film main body from the cathode and the foil surface of the traditional repair tank, and the withstand voltage value of the chemical tank is more favorably controlled.
In the original voltage forming control technology, the voltage between the foil surface and the last stage of electrified cathode plate after all electrified processes are finished is adopted. Compared with the present invention, the detection voltage value is lower, and the detection voltage value is mainly subjected to the electrification process after the restoration process (mainly a first-stage drying box or the treatment of phosphoric acid (or other acid or alkali)), the current is required to be electrified, the current is fluctuated by the fluctuation of the vehicle speed and the specific capacitance, the voltage actually forming the oxide film is directly caused, and the voltage resistance value is finally influenced. The voltage formed in the invention is irrelevant to the speed and the capacity, and the voltage withstanding value can be stably controlled.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (4)
1. A control method of the withstand voltage value of an aluminized foil for an aluminum electrolytic capacitor is characterized by comprising the following steps: the voltage of the last-stage chemical forming tank for forming the main body oxide film in the chemical forming process is controlled to control the voltage withstanding value of the aluminum chemical foil.
2. The control method according to claim 1,
the control method comprises the following steps: before the restoration chemical conversion treatment, a conductive roller is added in a chemical conversion groove with the main body oxide film basically formed, and the voltage between conductive electrode plates of the chemical conversion groove is a forming voltage.
3. The control method according to claim 2,
the detection point of the forming voltage is the cathode and the foil surface of the last-stage forming groove formed by the main body oxide film.
4. The control method according to claim 1,
the formation process is a multi-stage formation process.
Priority Applications (1)
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| CN116752198A (en) * | 2023-07-26 | 2023-09-15 | 深圳市凯琦佳科技股份有限公司 | Novel formation method of anode foil of aluminum electrolytic capacitor |
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