CN115305369B - 8021 aluminum foil and preparation method thereof, and 8021 aluminum alloy material - Google Patents

8021 aluminum foil and preparation method thereof, and 8021 aluminum alloy material Download PDF

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CN115305369B
CN115305369B CN202210999327.9A CN202210999327A CN115305369B CN 115305369 B CN115305369 B CN 115305369B CN 202210999327 A CN202210999327 A CN 202210999327A CN 115305369 B CN115305369 B CN 115305369B
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aluminum alloy
aluminum foil
aluminum
rolling
foil
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CN115305369A (en
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王维
李玉芝
孙启蕊
王伟彬
张子阳
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Henan University of Science and Technology
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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
    • 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
    • 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
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • 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
    • Y02E60/10—Energy storage using batteries

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Abstract

The invention relates to an 8021 aluminum foil and a preparation method thereof, and an 8021 aluminum alloy material, belonging to the technical field of aluminum-based materials. The 8021 aluminum foil provided by the invention comprises the following elements in percentage by mass: 1.3 to 1.5 percent of Fe, 0.5 to 1 percent of Cr, 0.5 to 1 percent of Sr, 0.05 to 0.1 percent of Si, 0.005 to 0.01 percent of Mn, 0.005 to 0.01 percent of Cu and the balance of Al. The Sr and Cr elements in the 8021 aluminum foil can play a role of an alterant, can change the crystallization condition of liquid aluminum, and ensures that Fe and Si are favorable for forming alpha phases, thereby effectively reducing the formation of coarse beta phases and theta phases in the aluminum foil, further controlling the size and the number of coarse second phases in an aluminum foil structure, reducing the number of pinholes, improving the processing performance of the aluminum foil for soft packaging, and ensuring that the aluminum foil has good metallurgical performance, high tensile strength and high elongation.

Description

8021 aluminum foil and preparation method thereof, and 8021 aluminum alloy material
Technical Field
The invention relates to an 8021 aluminum foil and a preparation method thereof, and an 8021 aluminum alloy material, belonging to the technical field of aluminum-based materials.
Background
8000 series aluminium alloy has the characteristics of low price, light weight, good heat resistance, excellent electric conductivity, easy processing, etc., and is gradually widely used in the fields of packaging, construction and electromechanics, becoming a main alloy system for producing ultrathin double-zero aluminium foil. However, 8000-series aluminum alloys have high contents of Fe and Si, and are liable to generate a second phase (round granular alpha-phase-Al 8 Fe 2 Si, disk-like beta-phase-Al 5 FeSi and needle-like theta phase-Al 3 Fe) and the second phase is large in number and complex in composition, and the coarse needle-like theta phase and beta phase contained therein are extremely liable to formIs a crack source and is expanded into pinholes, thereby reducing the mechanical properties of the alloy. The second phase becomes the most important factor affecting the quality of 8000 series double-zero aluminum foil finished products, and further affects the application of 8000 series aluminum alloy in industrial production.
The 8021 aluminum alloy has obvious advantages in the aspects of strength, elongation and calendaring, so that the 8021 aluminum foil can be used for flexible packaging of lithium ion batteries, but the 8021 aluminum alloy is used as 8000 series aluminum alloy, and the product often has the defects of exceeding standard of pinholes, low elongation, cupping value and the like, and is extremely easy to cause the quality problems of electrolyte leakage and the like of the lithium ion batteries. Aiming at the defects of the 8021 aluminum foil, the Chinese patent application with the document number of CN106191544A discloses an 8021 soft package aluminum foil for a lithium battery, wherein the 8021 soft package aluminum foil is prepared by smelting and casting an aluminum alloy containing alloy elements Si, fe, cu, mn, mg, cr, zn, ti and the balance of Al, and then carrying out surface milling and soaking treatment, hot rolling, cold rolling and annealing, foil rolling, coiling annealing and coiling separating on the casting ingot to obtain the soft package aluminum foil for the lithium battery. The 8021 soft-package aluminum foil material for the lithium battery is a finished product in an O state, the elongation reaches 18-20%, the cupping value is more than or equal to 7mm, and the folding resistance, the punching resistance and the like of the soft-package aluminum foil are effectively improved. Although the 8021 soft-covered aluminum foil for lithium batteries has higher elongation and cupping value, the tensile strength of the 8021 soft-covered aluminum foil cannot be improved because the second phase in the alloy is not treated.
Disclosure of Invention
The invention aims to provide an 8021 aluminum foil with high tensile strength.
The invention also provides a preparation method of the 8021 aluminum foil.
The invention also provides an 8021 aluminum alloy material with high tensile strength.
In order to achieve the above purpose, the technical scheme adopted by the 8021 aluminum foil of the invention is as follows:
an 8021 aluminum foil comprises the following elements in percentage by mass: 1.3 to 1.5 percent of Fe, 0.5 to 1 percent of Cr, 0.5 to 1 percent of Sr, 0.05 to 0.1 percent of Si, 0.005 to 0.01 percent of Mn, 0.005 to 0.01 percent of Cu and the balance of Al.
The Sr and Cr elements in the 8021 aluminum foil can play a role of an alterant, can change the crystallization condition of liquid aluminum, and ensures that Fe and Si are favorable for forming alpha phases, thereby effectively reducing the formation of coarse beta phases and theta phases in the aluminum foil, further controlling the size and the number of coarse second phases in an aluminum foil structure, reducing the number of pinholes, improving the processing performance of the aluminum foil for soft packaging, and ensuring that the aluminum foil has good metallurgical performance, high tensile strength and high elongation. The 8021 aluminum foil provided by the invention can reduce the number of pinholes by using Sr and Cr elements, improve the tensile strength and the elongation of the aluminum foil, and has the advantages of low cost, easiness in realization and remarkable economic benefit.
The 8021 aluminum foil can be used as an aluminum foil for a lithium battery soft package, and can be applied to the fields of packaging, construction and electromechanics, such as a smoke foil, an aluminum foil for an electrolytic capacitor, a decorative foil, a medicinal foil, a cable foil and an air-conditioning foil.
Further, the 8021 aluminum foil is composed of the following elements in percentage by mass: 1.3 to 1.4 percent of Fe, 0.7 to 0.9 percent of Cr, 0.6 to 0.8 percent of Sr, 0.07 to 0.09 percent of Si, 0.008 to 0.009 percent of Mn, 0.006 to 0.007 percent of Cu and the balance of Al.
The technical scheme adopted by the preparation method of the 8021 aluminum foil is as follows:
the preparation method of the 8021 aluminum foil comprises the following steps: preparing an aluminum alloy ingot according to the mass percentage of each element in the 8021 aluminum foil, milling the surface of the aluminum alloy ingot, performing homogenization annealing treatment, rolling into a single-layer aluminum foil coiled material, performing coiling treatment on the single-layer aluminum foil coiled material, performing rolling, and then cutting.
The preparation method of the 8021 aluminum foil has simple and convenient process and is suitable for large-scale processing and manufacturing of the aluminum foil.
Further, the aluminum alloy cast ingot is prepared by adopting a vacuum suction casting method. The vacuum suction casting method is adopted to prepare the aluminum alloy cast ingot, so that the success rate of the cast can be improved, the risk of alloy liquid waste is reduced, the defects of the aluminum alloy cast ingot can be reduced, the metallurgical performance, the hot working organization performance, the strength and the toughness of the aluminum foil are further improved, and the soft package aluminum foil which is free of holes and pinholes, high in tensile strength, high in yield strength and high in elongation is obtained.
Further, the vacuum suction casting method comprises the following steps: filling the aluminum alloy melt in a crystallizer, and then solidifying the aluminum alloy melt in the crystallizer to form an aluminum alloy cast ingot; in the process of filling and solidifying the aluminum alloy melt, controlling the vacuum degree in the crystallizer to be 10 -1 Pa～10 -2 Pa. The filling and solidification forming processes of the aluminum alloy melt are carried out in a state that negative pressure difference is formed in a vacuum environment, so that the aluminum alloy melt is prevented from being wrapped to generate air holes, various harmful gases and impurities in the aluminum liquid can be removed, the aluminum alloy melt with high purity is obtained, and the hydrogen content of a finished aluminum foil can be controlled below 0.1mL/100 gAl.
Further, the aluminum alloy melt is prepared by a method comprising the following steps: taking aluminum ingots and intermediate alloy according to the mass percentages of the elements in the 8021 aluminum foil, smelting at 850-880 ℃, then cooling to 710-720 ℃ and preserving heat to obtain the aluminum foil. For example, the smelting temperature is 860 or 870 ℃, and the holding temperature is 712 or 715 ℃. The smelting time is preferably 1.5-2 hours. The time for the heat preservation is preferably 0.5 to 2 hours. The master alloy comprises an Al-Cr master alloy, an Al-Sr master alloy, an Al-Fe master alloy, an Al-Si master alloy, an Al-Mn master alloy and an Al-Cu master alloy.
Further, the thickness of the single-layer aluminum foil coiled material is 0.05-0.07 mm. The rolling comprises hot rolling, cold rolling and foil rolling which are sequentially carried out. The hot rolling gives an aluminum alloy coil having a thickness of 2.5 to 4mm, for example, 3 to 3.5mm. The cold rolling comprises cold rough rolling and cold finish rolling which are sequentially carried out; the cold rough rolling rolls the aluminum alloy coil to a thickness of 1.0 to 1.3mm, for example, 1.1mm or 1.2mm or 1.3mm; the cold finish rolling rolls the aluminum alloy coil to a thickness of 0.2 to 0.4mm, for example, 0.3mm. The foil rolling is carried out for 4 to 5 passes. The double-layer aluminum foil coiled material is obtained after the rolling, and the thickness of the double-layer aluminum foil coiled material obtained by the rolling is 0.04-0.09 mm, for example, the thickness is 0.05m or 0.06mm. The rolling is carried out for 1 pass.
Further, the single-layer aluminum foil coiled material is subjected to the coiling treatment, the coiling treatment is performed after one single-layer aluminum foil coiled material is coiled, or more than two single-layer aluminum foil coiled materials are directly coiled. The separation is to break in the middle of a single-layer aluminum foil large roll and divide the large roll into two small rolls.
For 8021 aluminum foil requiring soft state delivery, annealing treatment can be performed before or after slitting, and for 8021 aluminum foil requiring hard state delivery, annealing treatment before or after slitting is not required. Further, before slitting, annealing the double-layer aluminum foil coiled material obtained by the lap rolling to an O state.
Further, the temperature of the homogenizing annealing treatment is 460-520 ℃ and the time is 6-8 h. For example, the temperature of the homogenizing annealing treatment is 500, 505 or 510 ℃. The homogenizing annealing treatment time is 6 hours or 7 hours. By controlling the temperature of the homogenizing annealing treatment to be between 460 and 520 ℃, the risk of sticking and coiling caused by high recrystallization temperature due to high Mn content in the alloy can be avoided.
Further, the thickness of the 8021 aluminum foil is 0.025-0.045 mm.
The technical scheme adopted by the 8021 aluminum alloy material is as follows:
an 8021 aluminum alloy material comprises the following elements in percentage by mass: 1.3 to 1.5 percent of Fe, 0.5 to 1 percent of Cr, 0.5 to 1 percent of Sr, 0.05 to 0.1 percent of Si, 0.005 to 0.01 percent of Mn, 0.005 to 0.01 percent of Cu and the balance of Al.
According to the 8021 aluminum alloy material, the added alloy elements Sr and Cr can be used as an modifier, so that the crystallization condition of liquid aluminum can be changed, the internal structure of the 8021 aluminum alloy material is optimized, and Fe and Si are beneficial to forming alpha phases, so that the formation of coarse beta phases and theta phases in the 8021 aluminum alloy material is effectively reduced, the size and the number of coarse second phases in a structure are further controlled, the number of pinholes is reduced, the processability of the 8021 aluminum alloy material is improved, and the tensile strength and the elongation of the 8021 aluminum alloy material are improved.
Further, the 8021 aluminum alloy material consists of the following elements in percentage by mass: 1.3 to 1.4 percent of Fe, 0.7 to 0.9 percent of Cr, 0.6 to 0.8 percent of Sr, 0.07 to 0.09 percent of Si, 0.008 to 0.009 percent of Mn, 0.006 to 0.007 percent of Cu and the balance of Al.
Detailed Description
The technical scheme of the invention is further described below with reference to the specific embodiments.
Example 1
The 8021 aluminum alloy material of the embodiment comprises the following elements in percentage by mass: fe 1.4%, cr 0.7%, sr 0.8%, si 0.09%, mn 0.008%, cu 0.006% and the balance Al.
Example 2
The 8021 aluminum alloy material of the embodiment comprises the following elements in percentage by mass: fe 1.3%, cr 0.9%, sr 0.8%, si 0.08%, mn 0.009%, cu 0.007% and the balance Al.
Example 3
The 8021 aluminum alloy material of the embodiment comprises the following elements in percentage by mass: fe 1.4%, cr 0.7%, sr 0.6%, si 0.07%, mn 0.009%, cu 0.007% and the balance Al.
Example 4
The 8021 aluminum foil of the embodiment comprises the following elements in percentage by mass: fe 1.4%, cr 0.7%, sr 0.8%, si 0.09%, mn 0.008%, cu 0.006% and the balance Al. This example 8021 aluminum foil was prepared using the preparation method of example 7.
Example 5
The 8021 aluminum foil of the embodiment comprises the following elements in percentage by mass: fe 1.3%, cr 0.9%, sr 0.8%, si 0.08%, mn 0.009%, cu 0.007% and the balance Al. The 8021 aluminum foil of this example was prepared using the preparation method of example 8.
Example 6
The 8021 aluminum foil of the embodiment comprises the following elements in percentage by mass: fe 1.4%, cr 0.7%, sr 0.6%, si 0.07%, mn 0.009%, cu 0.007% and the balance Al. The 8021 aluminum foil of this example was prepared using the preparation method of example 9.
Example 7
The preparation method of the 8021 aluminum foil in the embodiment comprises the following steps:
1) Preparing materials according to the mass percentage of each element in the 8021 aluminum foil, adding aluminum ingots and intermediate alloys (specifically Al-Cr, al-Sr, al-Fe, al-Si, al-Mn and Al-Cu intermediate alloys) into a smelting furnace, smelting in an argon atmosphere at a furnace temperature of 870 ℃ for 2 hours, leveling aluminum after smelting, reducing the temperature of the aluminum liquid to 712 ℃, and preserving the temperature for 0.5 hour to finally obtain an evenly mixed aluminum alloy melt;
2) Vacuum suction casting method for preparing aluminum alloy plate ingot: under the argon atmosphere, the crystallizer stretches into the prepared aluminum alloy melt, a vacuum pump is started to enable the crystallizer to be in a vacuum state, the aluminum alloy liquid is filled by utilizing the formed negative pressure difference, and the aluminum alloy melt is cooled to be solidified into a slab ingot; controlling the vacuum degree in the crystallizer to be kept at 10 in the process of filling and gelling the aluminum alloy melt -1 Pa；
3) Sawing and milling a plate ingot, performing homogenizing annealing treatment (the homogenizing annealing treatment is to keep the temperature at 500 ℃ for 7 hours), then performing hot rolling, adopting emulsion to lubricate in the hot rolling process, and cooling to obtain an aluminum alloy coiled material with the thickness of 3mm; then cold rough rolling the aluminum alloy coiled material to 1.3mm, finish rolling to 0.3mm in thickness, and rolling for 4 passes by a foil rolling mill to obtain a single-layer aluminum foil coiled material with the thickness of 0.06 mm;
4) And (3) after the prepared single-layer aluminum foil coiled material is coiled by an on-line oil spraying coiling machine, coiling to obtain a double-layer coiled material with the thickness of 0.12mm, rolling the double-layer aluminum foil coiled material to the thickness of 0.06mm by 1 pass of an aluminum foil rolling mill, then completely annealing to an O state, and then dividing the double-layer coiled material into single layers by a dividing and cutting machine. Cutting the prepared 8021 aluminum foil according to the required size, packaging and warehousing after the aluminum foil is qualified by inspection.
Example 8
The preparation method of the 8021 aluminum foil in the embodiment comprises the following steps:
1) Preparing materials according to the mass percentage of each element in the 8021 aluminum foil, adding aluminum ingots and intermediate alloys (specifically Al-Cr, al-Sr, al-Fe, al-Si, al-Mn and Al-Cu intermediate alloys) into a smelting furnace, smelting in an argon atmosphere at the furnace temperature of 860 ℃ for 1.5 hours, leveling aluminum after smelting, cooling the aluminum liquid to 710 ℃ and preserving the heat for 0.5 hour to finally obtain an evenly mixed aluminum alloy melt;
2) Vacuum suction casting method for preparing aluminum alloy plate ingot: under the argon atmosphere, the crystallizer stretches into the prepared aluminum alloy melt, a vacuum pump is started to enable the crystallizer to be in a vacuum state, the aluminum alloy liquid is filled by utilizing the formed negative pressure difference, and the aluminum alloy melt is cooled to be solidified into a slab ingot; controlling the vacuum degree in the crystallizer to be kept at 10 in the process of filling and gelling the aluminum alloy melt -2 Pa；
3) Sawing and milling a plate ingot, performing homogenizing annealing treatment (the homogenizing annealing treatment is to keep the temperature at 510 ℃ for 7 hours), then performing hot rolling, adopting emulsion to lubricate in the hot rolling process, and cooling to obtain an aluminum alloy coiled material with the thickness of 3mm; then cold rough rolling the aluminum alloy coiled material to 1.1mm, finish rolling to 0.3mm in thickness, and rolling for 4 passes by a foil rolling mill to obtain a single-layer aluminum foil coiled material with the thickness of 0.05 mm;
4) And (3) after the prepared single-layer aluminum foil coiled material is coiled by an on-line oil spraying coiling machine, coiling to obtain a double-layer coiled material with the thickness of 0.1mm, rolling the double-layer aluminum foil coiled material to the thickness of 0.06mm by an aluminum foil rolling mill for 1 pass, then completely annealing to an O state, and then dividing the double-layer coiled material into single layers by a dividing and cutting machine. Cutting the prepared 8021 aluminum foil according to the required size, packaging and warehousing after the aluminum foil is qualified by inspection.
Example 9
The preparation method of the 8021 aluminum foil in the embodiment comprises the following steps:
1) Preparing materials according to the mass percentage of each element in the 8021 aluminum foil, adding aluminum ingots and intermediate alloys (specifically Al-Cr, al-Sr, al-Fe, al-Si, al-Mn and Al-Cu intermediate alloys) into a smelting furnace, smelting in an argon atmosphere at a furnace temperature of 850 ℃ for 2 hours, leveling aluminum after smelting, reducing the temperature of the aluminum liquid to 715 ℃ and preserving the heat for 2 hours to finally obtain a uniformly mixed aluminum alloy melt;
2) Vacuum suction casting method for preparing aluminum alloy plate ingot: under argon atmosphere, the crystallizer is stretched into the prepared aluminum alloy melt, a vacuum pump is started to enable the crystallizer to be in a vacuum state, the aluminum alloy liquid is filled by utilizing the formed negative pressure difference, and the temperature is reduced to enable the aluminum alloy melt to be solidifiedForming a slab ingot; controlling the vacuum degree in the crystallizer to be kept at 10 in the process of filling and gelling the aluminum alloy melt -1 Pa；
3) Sawing and milling the slab ingot, carrying out homogenizing annealing treatment (the homogenizing annealing treatment is that the temperature is kept at 505 ℃ for 6 hours), then carrying out hot rolling, adopting emulsion to lubricate in the hot rolling process, and cooling to obtain an aluminum alloy coiled material with the thickness of 3.5 mm; then cold rough rolling the aluminum alloy coiled material to 1.2mm, finish rolling to 0.4mm in thickness, and rolling for 4 passes by a foil rolling mill to obtain a single-layer aluminum foil coiled material with the thickness of 0.07mm;
4) And (3) after the prepared single-layer aluminum foil coiled material is coiled by an on-line oil spraying coiling machine, coiling to obtain a double-layer coiled material with the thickness of 0.14mm, rolling the double-layer aluminum foil coiled material to the thickness of 0.04mm by an aluminum foil rolling mill for 1 pass, then completely annealing to an O state, and then dividing the double-layer coiled material into single layers by a dividing and cutting machine. Cutting the prepared 8021 aluminum foil according to the required size, packaging and warehousing after the aluminum foil is qualified by inspection.
Comparative example 1
The aluminum foil of the comparative example consists of the following elements in percentage by mass: fe 1.4%, si 0.09%, mn 0.008%, cu 0.006%, the balance being Al. The aluminum foil of this comparative example was prepared in the same manner as in example 7, but since Cr and Sr were not contained, the intermediate alloy of Al-Cr and Al-Sr was omitted when the intermediate alloy was added.
Comparative example 2
The aluminum foil of the comparative example consists of the following elements in percentage by mass: fe 1.4%, cr 1.2%, sr 1.1%, si 0.09%, mn 0.008%, cu 0.006%, the balance being Al. The aluminum foil of this comparative example was prepared by the preparation method of example 7.
Comparative example 3
The aluminum foil of the comparative example consists of the following elements in percentage by mass: fe 1.4%, cr 0.3%, sr 0.4%, si 0.09%, mn 0.008%, cu 0.006%, the balance being Al. The aluminum foil of this comparative example was prepared by the preparation method of example 7.
Experimental example
The aluminum foils 8021 of examples 4 to 6 and the aluminum foils of comparative examples 1 to 3 were respectively tested for tensile strength, upper yield strength, total elongation, cupping value, needle hole ratio and hydrogen content, wherein the test methods and test samples of the tensile strength, upper yield strength and total elongation were conducted in accordance with the specifications of the YB/T4334-2013 metal foil room temperature tensile test method standard; the cup number is tested according to YS/T419-2000 aluminum and aluminum alloy cup test method; the needle hole rate is tested according to the national standard GB/T22638.2-2008, and the hydrogen content is tested by adopting an ALSCAN on-line hydrogen meter.
The test results are shown in Table 1.
TABLE 1 Performance test results of aluminum foil

Claims (8)

1. An 8021 aluminum foil, wherein: the composite material consists of the following elements in percentage by mass: 1.3-1.5% of Fe, 0.5-1% of Cr, 0.5-1% of Sr, 0.05-0.1% of Si, 0.005-0.01% of Mn, 0.005-0.01% of Cu and the balance of Al; the 8021 aluminum foil is prepared by a method comprising the following steps: preparing an aluminum alloy ingot according to the mass percent of each element in the 8021 aluminum foil, milling the surface of the aluminum alloy ingot, performing homogenization annealing treatment, rolling into a single-layer aluminum foil coiled material, performing coiling treatment on the single-layer aluminum foil coiled material, performing rolling, and then cutting; the aluminum alloy cast ingot is prepared by adopting a vacuum suction casting method; the vacuum suction casting method comprises the following steps: filling the aluminum alloy melt in a crystallizer, and then solidifying the aluminum alloy melt in the crystallizer to form an aluminum alloy cast ingot; in the process of filling and solidifying the aluminum alloy melt, controlling the vacuum degree in the crystallizer to be 10 -1 Pa~10 - 2 Pa; the temperature of the homogenizing annealing treatment is 460-520 ℃.
2. The 8021 aluminum foil according to claim 1, wherein: the composite material consists of the following elements in percentage by mass: 1.3-1.4% of Fe, 0.7-0.9% of Cr, 0.6-0.8% of Sr, 0.07-0.09% of Si, 0.008-0.009% of Mn, 0.006-0.007% of Cu and the balance of Al.
3. A method of preparing an 8021 aluminium foil according to claim 1 or 2, wherein: the method comprises the following steps: preparing an aluminum alloy ingot according to the mass percent of each element in the 8021 aluminum foil, milling the surface of the aluminum alloy ingot, performing homogenization annealing treatment, rolling into a single-layer aluminum foil coiled material, performing coiling treatment on the single-layer aluminum foil coiled material, performing rolling, and then cutting; the aluminum alloy cast ingot is prepared by adopting a vacuum suction casting method; the vacuum suction casting method comprises the following steps: filling the aluminum alloy melt in a crystallizer, and then solidifying the aluminum alloy melt in the crystallizer to form an aluminum alloy cast ingot; in the process of filling and solidifying the aluminum alloy melt, controlling the vacuum degree in the crystallizer to be 10 -1 Pa~10 -2 Pa; the temperature of the homogenizing annealing treatment is 460-520 ℃.
4. A method of making an 8021 aluminum foil in accordance with claim 3, wherein: the thickness of the single-layer aluminum foil coiled material is 0.05-0.07 mm; the rolling comprises hot rolling, cold rolling and foil rolling which are sequentially carried out; the aluminum alloy coiled material with the thickness of 2.5-4 mm is obtained through hot rolling; the cold rolling comprises cold rough rolling and cold finish rolling which are sequentially carried out; the cold rough rolling rolls the aluminum alloy coiled material to a thickness of 1.0-1.3 mm, and the cold finish rolling rolls the aluminum alloy coiled material to a thickness of 0.2-0.4 mm; the foil rolling is carried out for 4-5 passes; the thickness of the double-layer aluminum foil coiled material obtained by the folding rolling is 0.04-0.09 mm.
5. The method for preparing an 8021 aluminum foil according to claim 3 or 4, wherein: and (3) before slitting, annealing the double-layer aluminum foil coiled material obtained by the lapping to an O state.
6. The method for preparing an 8021 aluminum foil according to claim 3 or 4, wherein: the homogenizing annealing treatment time is 6-8 hours.
7.8021 aluminum alloy material, characterized in that: the composite material consists of the following elements in percentage by mass: 1.3-1.5% of Fe, 0.5-1% of Cr, 0.5-1% of Sr, 0.05-0.1% of Si, 0.005-0.01% of Mn, 0.005-0.01% of Cu and the balance of Al; the 8021 aluminum alloy material is prepared by a method comprising the following steps: preparing an aluminum alloy ingot according to the mass percent of each element in the 8021 aluminum alloy material, milling the surface of the aluminum alloy ingot, performing homogenization annealing treatment, rolling into a single-layer aluminum foil coiled material, performing coiling treatment on the single-layer aluminum foil coiled material, performing rolling, and then cutting; the aluminum alloy cast ingot is prepared by adopting a vacuum suction casting method; the vacuum suction casting method comprises the following steps: filling the aluminum alloy melt in a crystallizer, and then solidifying the aluminum alloy melt in the crystallizer to form an aluminum alloy cast ingot; in the process of filling and solidifying the aluminum alloy melt, controlling the vacuum degree in the crystallizer to be 10 -1 Pa~10 -2 Pa; the temperature of the homogenizing annealing treatment is 460-520 ℃.
8. The 8021 aluminum alloy material according to claim 7, wherein: the composite material consists of the following elements in percentage by mass: 1.3-1.4% of Fe, 0.7-0.9% of Cr, 0.6-0.8% of Sr, 0.007-0.09% of Si, 0.008-0.009% of Mn, 0.006-0.007% of Cu and the balance of Al.
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