JP7033664B2 - Manufacturing method of 1XXX cathode foil for aluminum electrolytic capacitors - Google Patents

Description

The present invention relates to the technical field of aluminum foil for aluminum electrolytic capacitors, and more specifically to a method for manufacturing a 1XXX-based cathode foil for aluminum electrolytic capacitors.

Cathode electronic aluminum foil is one of the important raw materials for manufacturing aluminum electrolytic capacitors. Currently, the materials commonly used for producing cathode electronic aluminum foil are pure aluminum (1XXX series), aluminum copper (2XXX), and aluminum manganese (3XXX). In the current disclosure, 1XXX-based cathode foils for aluminum electrolytic capacitors produced by the casting and rolling process usually require heat treatment in the process of rolling from the casting and rolling coil to the thickness of the finished product, or hot rolling. Produced by. The prior art CN105908021A discloses the production of pure aluminum cathode foils for capacitors and the production thereof for the problem of non-uniform corrosion of commonly used cathode foils, but the heat treatment corresponding to the production process thereof. Is required. JP-A-07-090519, JP-A-7-180008, JP-A-2002-47522, JP-A-2001-294960, JP-A-2010-248551 and JP-A-2008-78277 are all pure aluminum for capacitors by the hot rolling method. Produces cathode foil. In fact, when 1XXX cathode foil for aluminum electrolytic capacitors with a purity of 99.85% or more is produced by the hot rolling method, the phenomenon that the ingot structure is coarse and asymmetric during the casting process can be solved. However, misalignment often occurs during hot rolling, causing cracks, poor shape, low yield, and soaring production costs. If the misalignment is large, the original coil material pops out of the roller table and the equipment collides. It can be damaged and pose a safety issue. A method of improving the uniformity of the structure in the production process of the cathode foil is also an important problem in the production technology of the cathode electronic aluminum foil.

Therefore, the present invention provides a method for producing a 1XXX-based cathode foil for an aluminum electrolytic capacitor by casting and rolling, and can obtain the same specific volume as a 1XXX-based cathode foil for an aluminum electrolytic capacitor by a hot rolling method. Various abnormal conditions due to uneven tissue can be avoided. It is very important as a method for manufacturing a 1XXX-based cathode foil for aluminum electrolytic capacitors.

The technical problem to be solved by the present invention is that in the conventional manufacturing process of 1XXX cathode foil for aluminum electrolytic capacitors, the structure of the ingot tends to be non-uniform, and misalignment, cracks, shape defects, etc. occur during hot rolling. It is an object of the present invention to solve defects and deficiencies that are likely to occur, and to provide a 1XXX-based cathode foil for an aluminum electrolytic capacitor and a method for manufacturing the same. The manufacturing method of the present invention does not use a refining agent, does not add a crystal micronizing agent, does not require heat treatment before rolling the product to the thickness of the finished product, and is manufactured by the manufacturing method of the present invention. The product has excellent specific volume and mechanical properties.

The above object of the present invention is realized by the following technical proposals.

A method for manufacturing 1XXX cathode foil for aluminum electrolytic capacitors.
5.5 to 7 using Al ≧ 99.85%, Si ≦ 350 ppm, Fe ≦ 400 ppm, Cu ≦ 100 ppm, Mg ≦ 200 ppm, Zn ≦ 200 ppm, Ti ≦ 50 ppm, Mn ≦ 50 ppm as components based on mass percentage. Step S1 to manufacture a .5 mm cast-rolled billet,
The cast-rolled billet obtained in S1 is cold-rolled and foil-rolled to obtain a 1XXX-based cathode foil having a thickness of 0.02 to 0.06 mm, which includes cold-rolling and foil-rolling steps S2.

INDUSTRIAL APPLICABILITY The present invention uses a casting and rolling method to produce a 1XXX-based cathode foil for an aluminum electrolytic capacitor, which has a short production process, does not require a hot rolling process, and has an intermediate product of a casting and rolling structure. Since there is no, the problem of uneven tissue can be effectively avoided. According to the present invention, when a cathode foil product for an aluminum electrolytic capacitor is produced by a hot rolling method, rolling misalignment, cracking, poor shape, low yield, safety risk, etc. due to the uneven structure of the cast ingot, etc. It avoids various problems and obtains the same specific volume as the product of the same composition by the hot rolling method.

In the present invention, the production process of the 1XXX-based cathode foil in each state is specifically as follows.
H22 / H24 / 0 Condition: Casting Rolling-Cold Rolling-Trimming-Cold Rolling-Trimming-Intermediate Cleaning-Foil Rolling-Completed Product Cleaning-Cutting-Completed Product Baking or Casting Rolling-Cold Rolling-Trimming-Cold Rolling-Intermediate Washing-Foil Rolling-Completed Product Cleaning-Cut-Completed Product Burning or Casting Rolling-Cold Rolling-Trimming-Cold Rolling-Intermediate Cleaning-Foil Rolling-Completed Product Cleaning-Completed Product Burning-Cut Trimming and Cleaning Is determined mainly according to the effect on the surface quality of the product, but preferably two trimmings are performed.
H18 state: Casting rolling-cold rolling-trimming-cold rolling-trimming-intermediate cleaning-foil rolling-cutting or casting rolling-cold rolling-trimming-intermediate cleaning-foil rolling-cutting trimming and cleaning are mainly Although determined depending on the effect on the surface quality of the product, two trimmings are preferably performed in consideration of the yield rate of the product.

The O-state or H22 product produced by the method of the present invention has a thickness of 0.040 to 0.060 mm and a tensile strength of 55 to 100 MPa, and the H18 or H24 product has a thickness of 0.020 to 0.040 mm. When the product state is H18, the tensile strength is 170 MPa or more, and when the product state is H24, the tensile strength is 110 to 150 MPa.

In S1, the thickness of the cast and rolled billet may be 5.7 mm, 5.8 mm, 6.1 mm, and 7.1 mm, but is preferably 6.1 mm.

Preferably, the second phase of the 1XXX-based cathode foil is spherical, needle-shaped or hexagonal. If the shape of the second phase is different, the influence on rolling is different, and the shape of the second phase of the present invention is advantageous for smooth rolling.

Preferably, the 1XXX-based cathode foil is in the H18 state, and the size of the second phase is less than 2.0 μm.

Preferably, in the above-mentioned production method, no heat treatment is performed before the 1XXX-based cathode foil having a diameter of 0.02 to 0.06 mm is obtained by rolling. The second phase is too small or too small due to the heat treatment, which is disadvantageous for subsequent corrosion. In the production method of the present invention, the heat treatment is not performed, which is advantageous for the formation of the second phase and contributes to the subsequent processing of the electrode foil. do.

Preferably, when the cast-rolled billet is manufactured in S1, nitrogen gas or argon gas is introduced while adjusting each component in the melt and the mass percentage thereof to control the temperature of the melt from 730 ° C to 760 ° C. After refining for 12 to 30 minutes, it is allowed to stand for 15 to 30 minutes, de-slagged, degassed and filtered and purified while controlling the temperature to 735 ° C to 750 ° C. To get.

The casting and rolling is continuous casting and rolling at a casting and rolling temperature of 685 to 710 ° C. and a casting and rolling speed of 700 to 1100 mm / min. The casting and rolling temperature may be 690 ± 5 ° C., 695 ± 5 ° C. or 705 ± 5 ° C.

Preferably, the degassing is performed by removing the hydrogen gas in the molten aluminum using argon gas, and the deslag operation is performed in an atmosphere of nitrogen gas, and is performed twice or more. Fluorine slag on the surface can be sufficiently removed by multiple de-slags, and when hydrogen gas in the molten aluminum is removed using argon gas, the hydrogen content after degassing is 0.12 ml / 100 gAl or less. ..

Preferably, for the degassing, an argon gas is spin-sprayed onto the molten aluminum using a silicon nitride rotor while controlling the rotation speed of the rotor to 400 to 550 r / min.

Preferably, for the degassing, a graphite rotor is used to spin-spray argon gas onto the molten aluminum while controlling the rotation speed of the rotor to 360 to 500 r / min.

Preferably, in S2, the material temperature after each rolling of the cold rolling and the foil rolling is 150 ° C. or lower.

Preferably, the 1XXX-based cathode foil is in the H22, H24 or O state.
Further included is a step of performing an annealing operation on a finished product having an annealing temperature of 255 to 350 ° C. and an annealing time of 6 to 30 hours.

The annealing temperature affects the final tensile strength and surface quality of the product, and by controlling the temperature and time of the annealing operation of related products, it is possible to give the product more stable tensile strength and excellent surface quality. Can be done. The surface quality of the present invention mainly refers to a surface defect called foil adhesion, and the degree of foil adhesion differs depending on the annealing temperature and time, and the degree of foil adhesion is based on whether or not it can be smoothly rewound. In the preferred annealing process of, both the inner and outer rings can be successfully rewound.

Preferably, the annealing temperature of the finished product is 270 to 310 ° C., and the annealing time is 10 to 25 hours. For example, it may be 280 ° C., 16h; 288 ° C., 14h; 295 ° C., 12h or 305 ° C., 25h.

Compared with the prior art, the beneficial effects of the present invention are as follows.
(1) In the present invention, when a 1XXX cathode foil for an aluminum electrolytic capacitor is produced by a hot rolling method, the structure of the ingot is coarse and asymmetrical, resulting in rolling misalignment, cracking, and poor shape. Provided is a method for producing a 1XXX-based cathode foil for an aluminum electrolytic capacitor by a casting and rolling method, which can avoid various problems such as low yield and safety risk.
(2) After the cast-rolled coil produced by the present invention is rolled to the thickness of the finished product, the size of the second phase is smaller than the size of the product produced by the hot rolling method, and the distribution of the second phase. Is more uniform than the distribution of the second phase of the finished product by the hot rolling method, and is more advantageous due to the corrosion uniformity of the 1XXX-based cathode foil for aluminum electrolytic capacitors.
(3) The cast-rolled coil according to the production method of the present invention does not require heat treatment during the rolling process and is directly rolled until the thickness of the finished product is 0.020 to 0.060 mm.
(4) The tensile strength of the O state or the H22 cathode foil produced by the production method of the present invention is 55 to 100 MPa, the tensile strength of the H18 cathode foil is 170 MPa or more, and the tensile strength of the H24 cathode foil is 110 to 150 MPa. Is.

It is a distribution map of the cathode foil of the comparative example 1. FIG. 6 is a scanning electron microscope image of the size of the cathode foil of Comparative Example 1. It is a distribution map of the cathode foil of Example 2. 6 is a scanning electron microscope image of the size of the cathode foil of Example 2. It is a distribution map of the cathode foil of Example 4. 6 is a scanning electron microscope image of the size of the cathode foil of Example 4. It is a distribution map of the cathode foil of Example 6. 6 is a scanning electron microscope image of the size of the cathode foil of Example 6. It is a distribution map of the cathode foil of Example 7. 6 is a scanning electron microscope image of the size of the cathode foil of Example 7.

Hereinafter, the present invention will be further described in a specific embodiment, but the examples do not limit the present invention in any way. The raw materials and reagents used in the examples of the present invention are generally available raw materials and reagents unless otherwise specified.

The method for detecting the tensile strength is GB / T228, but GB / T16865 may also be used.

鋳造圧延コイルを完成品の厚さまで冷間圧延、箔圧延するときにいかなる熱処理も必要としない。完成品は、厚さ０．０２２ｍｍ規格であり、製品状態Ｈ１８状態、製品強度１９２ＭＰａである。顧客であるＡメーカーが試用したところ、製品の比容積は合格した。 Example 1
A method for manufacturing a 1XXX-based cathode foil for an aluminum electrolytic capacitor, the method including steps S1 and S2.
S1. A cast-rolled billet is manufactured using the following mass percentage components. The alloy components shown in Table 1 are blended, nitrogen gas is introduced while controlling the temperature of the smelting furnace to 745 ° C., refining for 15 minutes, de-slag, sufficient stirring, and then sampling. After analysis, adjustment and passing, it is placed in a static furnace, allowed to stand for 20 minutes, smelted in a static furnace at 736 ° C, smelted and de-slagped, and at 505 rpm using a silicon nitride rotor. After degassing, it is sent to a casting and rolling machine and cast and rolled at a casting and rolling temperature of 697 ° C. and a casting and rolling speed of 730 mm / min to obtain a 7.1 mm casting and rolling coil.
S2. Cold rolling and foil rolling: The cast-rolled billet obtained in S1 is cold-rolled and foil-rolled to obtain a 0.022 mm 1XXX-based cathode foil. The material temperature after each rolling of cold rolling and foil rolling is 150 ° C. or lower.
The components of the alloy are shown in Table 1.
Table 1. Ingredients of Example 1

No heat treatment is required when the cast-rolled coil is cold-rolled or foil-rolled to the thickness of the finished product. The finished product has a thickness of 0.022 mm, a product state of H18, and a product strength of 192 MPa. When the customer, manufacturer A, tried it, the specific volume of the product passed.

Example 2
A cast-rolled coil was obtained in the same manner as in Example 1, and the cast-rolled coil was cold-rolled-trimming-cold-rolled-trimming-intermediate cleaning-foil rolling to the thickness of the finished product-finished product cleaning-cutting-. Finished product is annealed and does not require any heat treatment before rolling to the finished product thickness, finished product thickness 0.050 mm standard, product condition O state, finished product annealed process: 305 ° C * 25h, product strength It was 56 MPa, and when the customer B manufacturer tried it, the specific volume of the product passed, and it was 100.6% of the specific volume of the material by hot rolling.

鋳造圧延コイルを完成品の厚さまで冷間圧延、箔圧延するときにいかなる熱処理も必要としない。完成品は、厚さ０．０２２ｍｍ規格であり、製品状態Ｈ１８状態、製品強度１９６ＭＰａである。顧客であるＡメーカーが試用したところ、製品の比容積は合格した。 Example 3
A method for manufacturing a 1XXX-based cathode foil for an aluminum electrolytic capacitor, the method including steps S1 and S2.
S1. A cast-rolled billet is manufactured using the following mass percentage components. The alloy components shown in Table 1 are blended, nitrogen gas is introduced while controlling the temperature of the smelting furnace to 737 ° C., refining for 15 minutes, de-slag, sufficient stirring, and then sampling. After analysis, adjustment, and passing, it is placed in a static furnace, allowed to stand for 20 minutes, smelted in a static furnace at 730 ° C., de-slagged, and 505 rpm using a silicon nitride rotor. After degassing, it is sent to a casting and rolling machine and cast and rolled at a casting and rolling temperature of 688 ° C. and a casting and rolling speed of 950 mm / min to obtain a casting and rolling coil of 5.8 mm. Cold rolling and foil rolling: The cast-rolled billet obtained in S1 is cold-rolled and foil-rolled to obtain a 0.022 mm 1XXX-based cathode foil. The material temperature after each rolling of cold rolling and foil rolling was 150 ° C. or lower.
Alloy composition Table 2.
Table 2 Ingredient 3 of Example 3

No heat treatment is required when the cast-rolled coil is cold-rolled or foil-rolled to the thickness of the finished product. The finished product has a thickness of 0.022 mm, a product state of H18, and a product strength of 196 MPa. When the customer, manufacturer A, tried it, the specific volume of the product passed.

Example 4
A cast-rolled coil is obtained in the same manner as in Implementation 3, and the cast-rolled coil is cold-rolled-trimmed-cold-rolled-trimming-intermediate cleaning-foil rolling to the thickness of the finished product-finished product cleaning-cutting- Finished product is annealed and does not require any heat treatment before rolling to the finished product thickness, finished product thickness 0.048 mm standard, product state H22 state, finished product annealed process: 280 ° C * 16h, product strength 71MPa When the customer C manufacturer tried it, the specific volume of the product passed, and it was 103.5% of the specific volume of the material by hot rolling.

鋳造圧延コイルを完成品の厚さまで冷間圧延、箔圧延するときにいかなる熱処理も必要としない。完成品は、厚さ０．０２２ｍｍ規格であり、製品状態Ｈ１８状態、製品強度２０４ＭＰａである。顧客であるＡメーカーが使用したところ、製品の比容積は合格した。 Example 5
A method for manufacturing a 1XXX-based cathode foil for an aluminum electrolytic capacitor, the method including steps S1 and S2.
S1. A cast-rolled billet is manufactured using the following mass percentage components. The alloy components shown in Table 3 are blended, nitrogen gas is introduced while controlling the temperature of the smelting furnace to 760 ° C., refining for 15 minutes, de-slag, sufficient stirring, and then sampling. After analysis, adjustment and passing, it is placed in a static furnace, allowed to stand for 20 minutes, smelted in a static furnace at 748 ° C., de-slagged, and 480 rpm using a silicon nitride rotor. After degassing, it is sent to a casting and rolling machine and cast and rolled at a casting and rolling temperature of 706 ° C. and a casting and rolling speed of 850 mm / min to obtain a 6.1 mm casting and rolling coil.
S2. Cold rolling and foil rolling: The cast-rolled billet obtained in S1 is cold-rolled and foil-rolled to obtain a 0.022 mm 1XXX-based cathode foil. The material temperature after each rolling of cold rolling and foil rolling is 150 ° C. or lower.
Table 3 Ingredients of Example 5

No heat treatment is required when the cast-rolled coil is cold-rolled or foil-rolled to the thickness of the finished product. The finished product has a thickness of 0.022 mm, a product state of H18, and a product strength of 204 MPa. When used by the customer, manufacturer A, the specific volume of the product passed.

Example 6
A cast-rolled coil was obtained in the same manner as in Example 5, and the cast-rolled coil was cold-rolled-trimming-cold-rolled-trimming-intermediate cleaning-foil rolling to the thickness of the finished product-finished product cleaning-cutting-. Finished product is annealed and does not require any heat treatment before rolling to the finished product thickness, finished product thickness 0.050 mm standard, product state H22 state, finished product annealed process: 295 ° C * 12h, product strength 80MPa When the customer, manufacturer B, tried it, the specific volume of the product passed, and it was 100.2% of the specific volume of the material by hot rolling.

鋳造圧延コイルを完成品の厚さまで冷間圧延、箔圧延－完成品洗浄－切断－完成品焼鈍を行い、完成品の厚さに圧延する前にいかなる熱処理を必要とせず、完成品厚さ０．０３０ｍｍ規格であり、製品状態Ｈ２４状態、完成品焼鈍プロセス：２５５℃＊１５ｈ、製品強度１３３ＭＰａであり、顧客であるＤメーカーが試用したところ、合格した。 Example 7
A method for manufacturing a 1XXX-based cathode foil for an aluminum electrolytic capacitor, the method including steps S1 and S2.
S1. A cast-rolled billet is manufactured using the following mass percentage components. The alloy components shown in Table 4 are blended, nitrogen gas is introduced while controlling the temperature of the smelting furnace to 755 ° C., smelting is performed for 15 minutes, de-slag is performed, the mixture is sufficiently stirred, and then sampling is performed. After analysis, adjustment and passing, it is placed in a static furnace, allowed to stand for 20 minutes, smelted in a static furnace at 746 ° C, smelted and de-slagped, and at 480 rpm using a silicon nitride rotor. After degassing, it is sent to a casting and rolling machine and cast and rolled at a casting and rolling temperature of 693 ° C. and a casting and rolling speed of 1100 mm / min to obtain a 5.7 mm casting and rolling coil. Cold rolling and foil rolling: The cast-rolled billet obtained in S1 is cold-rolled and foil-rolled to obtain a 0.030 mm 1XXX-based cathode foil. The material temperature after each rolling of cold rolling and foil rolling is 150 ° C. or lower.
Table 4 Ingredients of Example 7

Cold-rolled cast-rolled coil to the thickness of the finished product, foil rolling-cleaning of the finished product-cutting-anbling of the finished product, no heat treatment is required before rolling to the thickness of the finished product, and the thickness of the finished product is 0. It is a 030 mm standard, the product state is H24 state, the finished product is annealed process: 255 ° C. * 15h, and the product strength is 133MPa. When the customer D manufacturer tried it, it passed.

インゴットの表面に表面ミリング、インゴットに均熱を行い、インゴットの保温温度を６０５℃、インゴットの保温時間を２５時間とした。熱間圧延の圧延開始温度を５３５℃、圧延終了温度を２８０℃に制御し、熱間圧延ビレットの厚さを６．０ｍｍ、総回数を２３回として、熱間圧延ビレットを完成品厚さまで冷間圧延した。
完成品厚さ０．０２２ｍｍ、製品状態Ｈ１８状態、引張強度１８３ＭＰａであり、顧客Ａが試用したところ、製品の比容積を１００％とした。
完成品厚さ０．０５０ｍｍ、製品状態Ｏ状態、引張強度７０ＭＰａであり、顧客Ｂが試用したところ、製品の比容積を１００％とした。
完成品厚さ０．０４８ｍｍ、製品状態Ｈ２２状態、引張強度６９ＭＰａであり、顧客Ｃが試用したところ、製品の比容積を１００％とした。
完成品厚さ０．０３０ｍｍ、製品状態Ｈ２４状態、引張強度１１６ＭＰａであり、顧客Ｄが試用したところ、製品は合格した。

Comparative Example 1 Hot rolling method After blending the alloy components, setting the temperature of the smelting furnace to 745 ° C, refining, de-slagging, and stirring sufficiently, sampling, analysis, adjustment, and passing are accepted. Put it in a static furnace, set the temperature of the static furnace to 736 ° C, smelt it in the static furnace to remove slag, put it in a casting machine, cast it at a temperature of 700 ° C to make an ingot, and show the chemical composition of the material in Table 5. show.
Table 5 Ingredients of Comparative Example

Surface milling was performed on the surface of the ingot and heat was equalized to the ingot, and the heat retention temperature of the ingot was set to 605 ° C. and the heat retention time of the ingot was set to 25 hours. The rolling start temperature of hot rolling is controlled to 535 ° C, the rolling end temperature is controlled to 280 ° C, the thickness of the hot rolling billet is 6.0 mm, the total number of times is 23 times, and the hot rolling billet is cooled to the thickness of the finished product. Rolled for a while.
The thickness of the finished product was 0.022 mm, the product state was H18, and the tensile strength was 183 MPa. When customer A tried it, the specific volume of the product was set to 100%.
The thickness of the finished product was 0.050 mm, the product state was O, and the tensile strength was 70 MPa. When customer B tried it, the specific volume of the product was set to 100%.
The thickness of the finished product was 0.048 mm, the product state was H22, and the tensile strength was 69 MPa. When customer C tried it, the specific volume of the product was set to 100%.
The finished product had a thickness of 0.030 mm, a product state of H24, and a tensile strength of 116 MPa. When customer D tried it, the product passed.

The specific volumes of the examples are all relative specific volumes obtained in comparison with this comparative example, and the larger the relative specific volume, the higher the measured value of the specific volume, which is suitable as a product.

Result detection Comparison of the second phase distribution, morphology and size of the comparative example and the example when the finished product is rolled to the H18 state Comparative Example 1 (FIGS. 1 and 2) and Examples (FIGS. 3 to 3). As can be seen from 10), the distribution of the second phase of the 1XXX-based cathode foil for aluminum electrolytic capacitors produced by the casting and rolling method is more uniform than that of the 1XXX-based cathode foil for aluminum electrolytic capacitors produced by the hot rolling method. The size of the second phase of the 1XXX-based cathode foil for aluminum electrolytic capacitors produced by the casting and rolling method is less than 2.0 μm, and the number of the second phases is relatively large, while it is produced by the hot rolling method. The size of the second phase of the 1XXX-based cathode foil for aluminum electrolytic capacitors reached approximately 4 μm, and the number of second phases was larger than that of the second phase of the 1XXX-based cathode foil for aluminum electrolytic capacitors produced by the casting and rolling method. Significantly less. Seen from the shape of the second phase, the hot rolling method mainly produces a rod-shaped second phase, which is disadvantageous for the subsequent cold rolling, and the 1XXX cathode foil for aluminum electrolytic capacitors produced by the casting rolling method is It has a spherical, needle-like and hexagonal second phase, which is mainly advantageous for rolling the product, which makes the machining process smoother.

FIGS. 1, 3, 5, 7 and 9 are images observed with a metallurgical microscope, and the black dots in FIGS. 1, 3, 5, 7 and 9 are the second phase, and the distribution of the second phase of the present invention is more detailed. It was found to be uniform.

As is clear, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and do not limit the embodiments of the present invention. Those skilled in the art may also make various other forms of change or modification based on the above description. A comprehensive list of all embodiments is not necessary and impossible. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention shall be included in the claims of the present invention.

Claims (9)

A method for manufacturing 1XXX cathode foil for aluminum electrolytic capacitors.
5.5 to 7 using Al ≧ 99.85%, Si ≦ 350 ppm, Fe ≦ 400 ppm, Cu ≦ 100 ppm, Mg ≦ 200 ppm, Zn ≦ 200 ppm, Ti ≦ 50 ppm, Mn ≦ 50 ppm as components based on mass percentage. Step S1 to manufacture a .5 mm cast-rolled billet,
The cast-rolled billet obtained in step S1 is cold-rolled and foil-rolled to obtain a 1XXX -based cathode foil having a thickness of 0.02 to 0.06 mm. ,
When the cast-rolled billet was manufactured in step S1, nitrogen gas or argon gas was introduced while controlling the temperature of the melt from 730 ° C to 760 ° C by adjusting each component in the melt and the mass percentage thereof. After refining for 12 to 30 minutes, it is allowed to stand for 15 to 30 minutes, de-slagged, degassed and filtered and purified while controlling the temperature to 735 ° C to 750 ° C, and cast-rolled to obtain a cast-rolled billet. , A method for manufacturing a 1XXX-based cathode foil for an aluminum electrolytic capacitor. The method for producing a 1XXX-based cathode foil for an aluminum electrolytic capacitor according to claim 1, wherein the second phase of the 1XXX-based cathode foil is spherical, needle-shaped, or hexagonal. The method for producing a 1XXX-based cathode foil for an aluminum electrolytic capacitor according to claim 2, wherein the 1XXX-based cathode foil is in the H18 state and the size of the second phase is less than 2.0 μm. The 1XXX for an aluminum electrolytic capacitor according to any one of claims 1 to 3, wherein no heat treatment is performed before a 0.02-0.06 mm 1XXX-based cathode foil is obtained by rolling. A method for manufacturing a cathode foil . The first aspect of claim 1 , wherein the degassing is performed by removing hydrogen gas in the molten aluminum using argon gas, and the de-slag operation is performed in an atmosphere of nitrogen gas and is performed twice or more. A method for manufacturing a 1XXX-based cathode foil for an aluminum electrolytic capacitor. The aluminum according to claim 5 , wherein the degassing is performed by spin-spraying argon gas onto the molten aluminum using a silicon nitride rotor while controlling the rotation speed of the rotor to 400 to 550 r / min. A method for manufacturing a 1XXX cathode foil for an electrolytic capacitor. The aluminum according to claim 5 , wherein the degassing is performed by using a graphite rotor to spin-spray argon gas onto the molten aluminum while controlling the rotation speed of the rotor to 360 to 500 r / min. A method for manufacturing a 1XXX-based cathode foil for an electrolytic capacitor. In step S2, the 1XXX-based cathode for an aluminum electrolytic capacitor according to any one of claims 1 to 3, wherein the material temperature after each of the cold rolling and foil rolling is 150 ° C. or lower. How to make foil. The 1XXX-based cathode foil is in the H22, H24 or O state, and is in the H22, H24 or O state.
The 1XXX-based cathode for an aluminum electrolytic capacitor according to any one of claims 1 to 3, further comprising a step of performing an annealing operation on a finished product having an annealing temperature of 255 to 350 ° C. and an annealing time of 6 to 30 hours. How to make foil.

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