CN113462916B - Production method of cathode foil blank with high specific capacitance for aluminum electrolytic capacitor - Google Patents
Production method of cathode foil blank with high specific capacitance for aluminum electrolytic capacitor Download PDFInfo
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- CN113462916B CN113462916B CN202110753082.7A CN202110753082A CN113462916B CN 113462916 B CN113462916 B CN 113462916B CN 202110753082 A CN202110753082 A CN 202110753082A CN 113462916 B CN113462916 B CN 113462916B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/40—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling foils which present special problems, e.g. because of thinness
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/14—Alloys based on aluminium with copper as the next major constituent with silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/12—Alloys based on aluminium with copper as the next major constituent
- C22C21/18—Alloys based on aluminium with copper as the next major constituent with zinc
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/057—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with copper as the next major constituent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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Abstract
The invention relates to a production method of a cathode foil blank with high specific capacitance of an aluminum electrolytic capacitor, which is characterized in that: the pure aluminum cathode foil for the capacitor comprises the following components in percentage by mass: 0.08-0.13%, cu 0.2-0.3%, mn 0.01%, mg:0.01%, cr 0.01%, zn:0.02 percent of Ti, 0.015 to 0.025 percent of Ti, and 1, the invention finally produces the cathode foil blank with the specific capacitance of the final product larger than 550 mu f/cm < 2 >.
Description
Technical Field
The invention relates to the technical field of a production method of a cathode foil blank with high specific capacitance of an aluminum electrolytic capacitor, in particular to a production method of a cathode foil blank with high specific capacitance of an aluminum electrolytic capacitor.
Background
The cathode foil is used as a core raw material of the aluminum electrolytic capacitor, the development of the cathode foil industry is highly dependent on the development of the aluminum electrolytic capacitor industry, the aluminum electrolytic capacitor in China is developed very fast, the cathode foil is a large country for producing the electrolytic capacitor in the world, the speed of the cathode foil is increased by about 9%, and the market supply and demand of the cathode foil and the market scale of the aluminum electrolytic capacitor basically keep the same direction change. The cathode foil blank in China is produced by a casting and rolling method at present, but the cathode foil blank produced by the casting and rolling method is uneven after the subsequent corrosion process and has low porosity and low specific capacitance of the final product due to the problems of uneven components, thick grains and the like of the casting and rolling blank, and the specific capacitance of the final product produced by the casting and rolling method at present can only reach about 450 mu f/cm < 2 > at the highest.
Disclosure of Invention
The invention aims to provide a production method of a cathode foil blank with high specific capacitance for an aluminum electrolytic capacitor.
In order to solve the above problems, the present invention provides a method for producing a cathode foil blank with high specific capacitance for an aluminum electrolytic capacitor, which is characterized in that: the pure aluminum cathode foil for the capacitor comprises the following components in percentage by mass: 0.08-0.13%, cu 0.2-0.3%, mn 0.01%, mg:0.01%, cr 0.01%, zn:0.02 percent of Ti, 0.015 to 0.025 percent;
the method comprises the following steps:
firstly, preparing cast ingots according to the components and the mass percentages;
secondly, homogenizing heat treatment and hot rolling process;
s1, homogenizing and heat treating the cast ingot in the first step at 580-600 ℃ for 8-10 hours;
s2, rolling into a hot rolled coil with the thickness of 7mm by a 1+4 hot continuous rolling production mode, wherein the final rolling temperature is 320-330 ℃;
thirdly, cold rolling and heat treatment process;
s1, rolling the hot rolled coil in the second step to 0.2-0.25mm, then recrystallizing and annealing at 320-340 ℃ for 4 hours, and air cooling;
s2, cold rolling the recrystallized annealed blank to the thickness required by the cathode foil
The invention provides a production method of a cathode foil blank with high specific capacitance for an aluminum electrolytic capacitor, which is characterized by comprising the following steps:
optimally, the specific process of the second step is as follows:
s1, homogenizing and heat-treating the cast ingot in the first step at 580 ℃ for 8 hours;
s2, rolling by using a 1+4 hot continuous rolling mill, wherein the thickness of a hot rolled blank is matched with the distribution of rolling reduction in the rolling process of a slab ingot from 610mm to 6-7mm of a finished product;
the hot rough rolling is distributed in 17 passes; the thickness of the intermediate slab at the hot rough rolling outlet is set at 40mm;
the pass allocation in production is as follows:
slab thickness 610mm, hot rolled blank thickness 7mm:
rough rolling for 17 times, wherein the pass thickness is as follows: 610mm, 592mm, 559mm, 524mm, 483mm, 442mm, 402mm, 361mm, 321mm, 281mm, 238mm, 197mm, 157mm, 121mm, 95mm, 70mm, 53mm, 40mm, and the thickness of the intermediate slab is 40mm;
the finish rolling thickness is as follows: 40mm, 30mm, 20mm, 12.5mm, 7mm;
the final rolling temperature of the hot finish rolling outlet is controlled at 320 DEG C
Optimally, the specific process of the second step is as follows:
s1, rolling the hot rolled coil in the second step to 0.2mm, and then recrystallizing and annealing at 320 ℃ for 4 hours, and air-cooling;
s2, cold rolling the recrystallized annealed blank to the thickness required by the cathode foil
Optimally, the hot rolled coil in the second step is rolled to 0.2mm in S1, and the specific process is as follows:
s1, hot rolling the thickness of a blank to be 7mm, and cold rolling the thickness of the blank to be 0.2mm;
the specific passes are sequentially distributed as follows: 7mm, 3.5mm, 1.8mm, 1.0mm, 0.63mm, 0.35mm, 0.2mm.
Optimally, the preparation process of the first cast-rolling blank comprises the following steps:
s1, adjusting the components and the mass percentages of pure aluminum cathode foil in a melt to be as follows: si:0.03%, fe 0.1%, cu:0.25%, ti:0.03%, mn 0.01%, mg:0.01%, cr 0.01%, zn:0.02% and controlling the temperature of the melt within 580 DEG C
The invention has the following beneficial effects:
1. the invention finally produces the cathode foil blank with the final specific capacitance of more than 550 mu f/cm < 2 >.
2. The homogenization heat treatment process of the invention adopts the heat preservation for 8 hours at 580-600 ℃, and the homogenization aims to mainly eliminate the segregation in the crystal and lead the components to be more uniform.
3. The invention needs 17 coarse knots when hot knots and cold knots are needed, so that the total processing rate can increase the dislocation on the surface of the material, and the corrosion is more uniform and the porosity is higher due to a large number of evenly distributed dislocations in the corrosion process. When the cathode foil is corroded, the core and the corrosion channel are needed, and the corrosion channel is related to the total processing rate and the pass processing rate of the product.
4. Recrystallizing and annealing the cold-rolled blank with the thickness of 0.2mm at 340 ℃ for 4 hours; after cold working, the aluminum alloy blank has the advantages that crystal lattices are distorted, crystal grains are damaged, broken or elongated, the crystal grains slide relatively, meanwhile, a work hardening phenomenon is generated, the crystallographic defects generated in the cold plastic deformation process are basically eliminated by the purpose of recrystallization annealing, uniform crystal grains are reformed, and the deformation strengthening effect and residual stress are eliminated.
Drawings
FIG. 1 is a schematic diagram showing the steps of a method for producing a cathode foil blank with high specific capacitance for an aluminum electrolytic capacitor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
One embodiment is,
As shown in fig. 1, a method for producing a cathode foil blank with high specific capacitance for an aluminum electrolytic capacitor is characterized in that: the pure aluminum cathode foil for the capacitor comprises the following components in percentage by mass: 0.08-0.13%, cu 0.2-0.3%, mn 0.01%, mg:0.01%, cr 0.01%, zn:0.02 percent of Ti, 0.015 to 0.025 percent;
the method comprises the following steps:
firstly, preparing cast ingots according to the components and the mass percentages;
secondly, homogenizing heat treatment and hot rolling process;
s1, homogenizing and heat treating the cast ingot in the first step at 580-600 ℃ for 8-10 hours;
s2, rolling into a hot rolled coil with the thickness of 7mm by a 1+4 hot continuous rolling production mode, wherein the final rolling temperature is 320-330 ℃;
thirdly, cold rolling and heat treatment process;
s1, rolling the hot rolled coil in the second step to 0.2-0.25mm, then recrystallizing and annealing at 320-340 ℃ for 4 hours, and air cooling;
s2, cold rolling the recrystallized annealed blank to the thickness required by the cathode foil.
The invention finally produces the cathode foil blank with the final specific capacitance of more than 550 mu f/cm < 2 >.
The homogenization heat treatment process of the invention adopts the heat preservation for 8 hours at 580-600 ℃, and the homogenization aims to mainly eliminate the segregation in the crystal and lead the components to be more uniform.
Recrystallizing and annealing the cold-rolled blank with the thickness of 0.2mm at 340 ℃ for 4 hours; after cold working, the aluminum alloy blank has the advantages that crystal lattices are distorted, crystal grains are damaged, broken or elongated, the crystal grains slide relatively, meanwhile, a work hardening phenomenon is generated, the crystallographic defects generated in the cold plastic deformation process are basically eliminated by the purpose of recrystallization annealing, uniform crystal grains are reformed, and the deformation strengthening effect and residual stress are eliminated.
Implementation column two,
Secondly, homogenizing heat treatment and hot rolling process;
the specific process of the second step is as follows:
s1, homogenizing and heat-treating the cast ingot in the first step at 580 ℃ for 8 hours;
s2, rolling by using a 1+4 hot continuous rolling mill, wherein the thickness of a hot rolled blank is matched with the distribution of rolling reduction in the rolling process of a slab ingot from 610mm to 6-7mm of a finished product;
the hot rough rolling is distributed in 17 passes; the thickness of the intermediate slab at the hot rough rolling outlet is set at 40mm;
the pass allocation in production is as follows:
slab thickness 610mm, hot rolled blank thickness 7mm:
rough rolling for 17 times, wherein the pass thickness is as follows: 610mm, 592mm, 559mm, 524mm, 483mm, 442mm, 402mm, 361mm, 321mm, 281mm, 238mm, 197mm, 157mm, 121mm, 95mm, 70mm, 53mm, 40mm, and the thickness of the intermediate slab is 40mm;
the finish rolling thickness is as follows: 40mm, 30mm, 20mm, 12.5mm, 7mm;
the final rolling temperature of the hot finish rolling outlet is controlled at 320 ℃.
Thirdly, cold rolling and heat treatment process;
the specific process of the third step is as follows:
s1, rolling the hot rolled coil in the second step to 0.2mm, and then recrystallizing and annealing at 320 ℃ for 4 hours, and air-cooling;
s2, cold rolling the recrystallized annealed blank to the thickness required by the cathode foil.
In the third step, rolling the S1 rolled coil to 0.2mm, wherein the specific process is as follows:
s1, hot rolling the thickness of a blank to be 7mm, and cold rolling the thickness of the blank to be 0.2mm;
the specific passes are sequentially distributed as follows: 7mm, 3.5mm, 1.8mm, 1.0mm, 0.63mm, 0.35mm, 0.2mm.
The invention needs 17 coarse knots when hot knots and cold knots are needed, so that the total processing rate can increase the dislocation on the surface of the material, and the corrosion is more uniform and the porosity is higher due to a large number of evenly distributed dislocations in the corrosion process. When the cathode foil is corroded, the core and the corrosion channel are needed, and the corrosion channel is related to the total processing rate and the pass processing rate of the product.
Implementation III,
The first step of cast rolling blank preparation process comprises the following steps:
s1, adjusting the components and the mass percentages of pure aluminum cathode foil in a melt to be as follows: si:0.03%, fe 0.1%, cu:0.25%, ti:0.03%, mn 0.01%, mg:0.01%, cr 0.01%, zn:0.02% and controlling the melt temperature within 580 ℃.
The remaining steps are the same as those of the first and second embodiments.
The invention finally produces the cathode foil blank with the final specific capacitance of more than 550 mu f/cm < 2 >.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A method for producing cathode foil blanks with high specific capacitance of an aluminum electrolytic capacitor is characterized in that: the pure aluminum cathode foil for the capacitor comprises the following components in percentage by mass: 0.08-0.13%, cu 0.2-0.3%, mn 0.01%, mg:0.01%, cr 0.01%, zn:0.02 percent of Ti, 0.015 to 0.025 percent;
the method comprises the following steps:
firstly, preparing cast ingots according to the components and the mass percentages;
secondly, homogenizing heat treatment and hot rolling process;
s1, homogenizing and heat treating the cast ingot in the first step at 580-600 ℃ for 8-10 hours;
s2, rolling into a hot rolled coil with the thickness of 7mm by a 1+4 hot continuous rolling production mode, wherein the final rolling temperature is 320-330 ℃;
thirdly, cold rolling and heat treatment process;
s1, rolling the hot rolled coil in the second step to 0.2-0.25mm, then recrystallizing and annealing at 320-340 ℃ for 4 hours, and air cooling;
s2, cold rolling the recrystallized annealed blank to the thickness required by the cathode foil;
the specific process of the second step is as follows:
rolling by using a 1+4 hot continuous rolling mill, wherein the thickness of a hot rolled blank and the rolling reduction distribution are matched in the rolling process of a slab ingot from 610mm to 6-7mm of a finished product;
the hot rough rolling is distributed in 17 passes; the thickness of the intermediate slab at the hot rough rolling outlet is set at 40mm;
the pass allocation in production is as follows:
slab thickness 610mm, hot rolled blank thickness 7mm:
rough rolling for 17 times, wherein the pass thickness is as follows: 610mm, 592mm, 559mm, 524mm, 483mm, 442mm, 402mm, 361mm, 321mm, 281mm, 238mm, 197mm, 157mm, 121mm, 95mm, 70mm, 53mm, 40mm, intermediate slab thickness 40mm;
the finish rolling thickness is as follows: 40mm, 30mm, 20mm, 12.5mm, 7mm;
the final rolling temperature of the hot finish rolling outlet is controlled at 320 ℃.
2. The method for producing a cathode foil blank with high specific capacitance for an aluminum electrolytic capacitor according to claim 1, wherein: the specific process of the third step is as follows:
s1, rolling the hot rolled coil in the third step to 0.2mm, and then recrystallizing and annealing at 320 ℃ for 4 hours, and air-cooling;
s2, cold rolling the recrystallized annealed blank to the thickness required by the cathode foil.
3. The method for producing a cathode foil blank with high specific capacitance for an aluminum electrolytic capacitor according to claim 2, characterized by: in S1, rolling the hot rolled coil in the third step to 0.2mm, wherein the specific process is as follows:
s1, hot rolling the thickness of a blank to be 7mm, and cold rolling the thickness of the blank to be 0.2mm;
the specific passes are sequentially distributed as follows: 7mm, 3.5mm, 1.8mm, 1.0mm, 0.63mm, 0.35mm, 0.2mm.
4. The method for producing a cathode foil blank with high specific capacitance for an aluminum electrolytic capacitor according to claim 1, wherein: the preparation process of the cast-rolled ingot in the first step comprises the following steps:
s1, adjusting the components and the mass percentages of pure aluminum cathode foil in a melt to be as follows: si:0.03%, fe 0.1%, cu:0.25%, ti:0.03%, mn 0.01%, mg:0.01%, cr 0.01%, zn:0.02% and controlling the melt temperature within 580 ℃.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908021A (en) * | 2016-05-18 | 2016-08-31 | 登电集团铝加工有限公司 | Pure aluminum cathode foil for capacitors and manufacturing method thereof |
| CN110060871A (en) * | 2019-04-04 | 2019-07-26 | 乳源东阳光优艾希杰精箔有限公司 | A kind of preparation method of aluminium electrolutic capacitor 1XXX series cathode foil |
| CN112281028A (en) * | 2020-09-23 | 2021-01-29 | 永杰新材料股份有限公司 | Aluminum foil for electrolytic capacitor and production method thereof |
| CN112582182A (en) * | 2020-12-30 | 2021-03-30 | 郑州金辉新能源电子材料有限公司 | Aluminum foil for high-specific-capacitance capacitor cathode and preparation process thereof |
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- 2021-07-02 CN CN202110753082.7A patent/CN113462916B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908021A (en) * | 2016-05-18 | 2016-08-31 | 登电集团铝加工有限公司 | Pure aluminum cathode foil for capacitors and manufacturing method thereof |
| CN110060871A (en) * | 2019-04-04 | 2019-07-26 | 乳源东阳光优艾希杰精箔有限公司 | A kind of preparation method of aluminium electrolutic capacitor 1XXX series cathode foil |
| CN112281028A (en) * | 2020-09-23 | 2021-01-29 | 永杰新材料股份有限公司 | Aluminum foil for electrolytic capacitor and production method thereof |
| CN112582182A (en) * | 2020-12-30 | 2021-03-30 | 郑州金辉新能源电子材料有限公司 | Aluminum foil for high-specific-capacitance capacitor cathode and preparation process thereof |
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