CN111702009A - Preparation method of T4 or T42-state 2024 aluminum alloy coated aluminum sheet - Google Patents

Preparation method of T4 or T42-state 2024 aluminum alloy coated aluminum sheet Download PDF

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CN111702009A
CN111702009A CN202010596111.9A CN202010596111A CN111702009A CN 111702009 A CN111702009 A CN 111702009A CN 202010596111 A CN202010596111 A CN 202010596111A CN 111702009 A CN111702009 A CN 111702009A
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ingot
aluminum alloy
plate
state
sheet
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CN111702009B (en
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吕正风
隋信栋
黄同瑊
晁代义
于芳
曹慧霞
王志雄
张华�
顾华锋
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Shandong Nanshan Aluminium Co Ltd
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Shandong Nanshan Aluminium Co Ltd
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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
    • B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/46—Roll speed or drive motor control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C3/00—Milling particular work; Special milling operations; Machines therefor
    • B23C3/13—Surface milling of plates, sheets or strips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • 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
    • 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
    • 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
    • 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
    • C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
    • 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
    • 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
    • B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B21B2001/383—Cladded or coated products
    • 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
    • B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B21B2001/386—Plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/001—Aluminium or its alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2201/00—Special rolling modes
    • B21B2201/06—Thermomechanical rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/20—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2275/00—Mill drive parameters
    • B21B2275/02—Speed
    • B21B2275/04—Roll speed

Abstract

The invention provides a preparation method of a T4 or T42 state 2024 aluminum alloy coated aluminum sheet, which comprises the following steps: carrying out two-pass homogenization process treatment on the aluminum alloy ingot to obtain a high-quality soaking ingot with the volume fraction of the residual second phase less than 0.9%; coating the high-quality soaking ingot to obtain a composite ingot plate; carrying out hot rolling treatment on the composite ingot plate to obtain a hot-rolled composite ingot plate; performing cold rolling treatment on the hot-rolled composite ingot plate to obtain a cold-rolled composite ingot plate; annealing the cold-rolled composite ingot plate to obtain an O-state coated aluminum sheet; and carrying out solution aging treatment on the O-state coated aluminum sheet to obtain the T4 or T42-state 2024 aluminum alloy coated aluminum sheet. The invention can solve the problems that the prior preparation process for preparing the T4 or T42-state 2024 aluminum alloy has uneven performance, low coating rate, easy occurrence of cracks, uneven coating thickness, difficult plate shape control and the like, and cannot well meet the AMS QQ-A-250/5 standard requirement.

Description

Preparation method of T4 or T42-state 2024 aluminum alloy coated aluminum sheet
Technical Field
The invention relates to the technical field of aluminum alloy sheet manufacturing, in particular to a preparation method of a T4 or T42-state 2024 aluminum alloy coated aluminum sheet.
Background
The 2-series aluminum alloy imported from abroad and mainly used for the skin of the large aircraft in China for a long time is protected by foreign patents and blocked by technologies in related technologies, and the research and development force of aluminum alloy plates and profiles for civil aircrafts is increased by depending on the national aluminum alloy industry alliance in recent high-end domestic aluminum alloy enterprises, the foreign technology blocking is overcome in an effort, and a foundation is laid for the localization of aviation aluminum alloy for the large aircraft in China. The 2024 aluminum alloy T42 clad aluminum sheet is mainly applied to wings as a skin material in foreign passenger aircraft. The alloy has the advantages of high strength, low specific gravity, good chemical milling roughness, high corrosion resistance and the like, is used as a substitute material for the wing skin of a large airplane and is listed in national civil airplane aluminum material key research and development projects.
2024 aluminum alloy belongs to one of Al-Cu-Mg series aluminum alloys, is a heat-treatment strengthening hard aluminum alloy, has the advantages of high strength, low specific gravity, good heat resistance, good fatigue strength and the like, is a typical high-strength structural aluminum alloy with excellent comprehensive performance, and is widely applied to manufacturing key structural members of high-cycle loads on spacecrafts such as airplane frameworks, rib beams, partition frames, skins and space satellites.
The aluminum-clad thin plate gives higher corrosion resistance to the alloy, and the design and use requirements of high safety and long service life of the airplane can be met. The 2024 alloy T42 state aluminum-clad thin plate has the problems of easy generation of cracks, low control precision of plate thickness, difficult control of surface roughness and the like in the process of cladding and rolling in the development process, so that the comprehensive performance can not meet the technical design requirement. Leading to the dependence of skin materials on imports for large aircraft projects made in China.
The skin material for large civil aircraft is 2 series aluminum alloy thin plate material with high strength, low density, good heat resistance and high damage tolerance capacity, skin material 2024-T351/2324-T3911 commonly used in the aviation field, spacer material 2124-T85 and the like.
The 2024 alloy O-state aluminum-clad thin plate can be subjected to related treatment according to requirements, the aluminum alloy in the state is subjected to solid solution natural aging to be in a T42 state, and the aluminum alloy in the state has high strength, high damage tolerance, high corrosion resistance and the like and is a preferred material for civil aircraft skins at present. The coating is used for A sheet for A large civil aircraft skin, but the prior art has the defects of uneven performance, low coating rate, easy crack generation, uneven coating thickness, difficult plate shape control and the like in the preparation process of materials, and cannot well meet the AMS QQ-A-250/5 standard requirement.
Disclosure of Invention
In view of the above problems, the present invention aims to provide A T4 or T42 state 2024 aluminum alloy clad aluminum sheet, so as to solve the problems that the performance is not uniform, the cladding rate is low, cracks are easy to occur, the thickness of A cladding layer is not uniform, the sheet shape control is difficult, and the like in the conventional preparation process of preparing the T4 or T42 state 2024 aluminum alloy, and the requirements of the AMS QQ- A-250/5 standard cannot be well met.
The invention provides a T4 or T42 state 2024 aluminum alloy coated aluminum sheet, which comprises:
carrying out two-pass homogenization process treatment on the aluminum alloy ingot to obtain a high-quality soaking ingot with the volume fraction of the residual second phase less than 0.9%;
coating the high-quality soaking ingot to obtain a composite ingot plate;
carrying out hot rolling treatment on the composite ingot casting plate to obtain a hot-rolled composite ingot casting plate;
performing cold rolling treatment on the hot-rolled composite ingot plate to obtain a cold-rolled composite ingot plate;
annealing the cold-rolled composite ingot plate to obtain an O-state coated aluminum sheet;
and carrying out solution aging treatment on the O-state coated aluminum sheet to obtain the T4 or T42-state 2024 aluminum alloy coated aluminum sheet.
In addition, preferably, the aluminum alloy ingot comprises the following elements: the steel is characterized by comprising the following components, by weight, less than 0.08% of Si, less than 0.20% of Fe, 4.4% -4.8% of Cu, 1.3% -1.7% of Mg, 0.4% -0.8% of Mn, less than 0.1% of Cr, less than 0.3% of Zn, less than 0.1% of Ti, other impurity elements, less than 0.05% of single element, less than 0.15% of total amount and the balance of aluminum.
In addition, the preferable scheme is that before the aluminum alloy ingot is subjected to two homogenization processes to obtain a high-quality soaking ingot with the volume fraction of the residual second phase less than 0.9%, the method further comprises the following steps:
preparing the aluminum alloy ingot; wherein the content of the first and second substances,
preparing the aluminum alloy ingot, comprising:
adding the raw materials of the aluminum alloy sheet into a capacity furnace according to a preset raw material ratio, drying at 220 +/-10 ℃ for 40 +/-5 min, adding an electrolyte, and smelting at 740 +/-10 ℃ to obtain a mixed raw material melt; wherein the content of the first and second substances,
adding a covering agent when the raw material of the aluminum alloy sheet begins to melt;
starting electromagnetic stirring after 60% -70% of the raw material of the aluminum alloy sheet is melted;
after the raw materials of the aluminum alloy sheet are completely melted, adding an aluminum alloy element additive into the melted raw materials of the aluminum alloy sheet for component adjustment;
carrying out slag skimming treatment on the mixed raw material melt;
and transferring the mixed raw material melt subjected to slagging-off treatment to a heat preservation furnace, refining mixed gas on the side of the heat preservation furnace for 40min +/-5 min, standing for 40min +/-5 min when the temperature of the mixed raw material melt reaches 705-710 ℃, and casting into an aluminum alloy cast ingot after online filtration.
In addition, the preferred scheme is that the aluminum alloy ingot is subjected to two homogenization processes to obtain a high-quality soaking ingot with the volume fraction of the residual second phase less than 0.9%, and the method comprises the following steps:
carrying out stress relief treatment on the aluminum alloy cast ingot;
and (3) placing the aluminum alloy ingot subjected to stress relief treatment in a furnace, heating to 400-480 ℃, preserving heat for 45-50 h, and naturally cooling after discharging.
In addition, it is preferable that the composite ingot plate is obtained by coating the high-quality soaking ingot, and includes:
carrying out double-sided surface milling treatment on the high-quality soaking ingot to obtain a smooth ingot;
respectively coating each milled surface of the smooth cast ingot by adopting a 1050 pure aluminum plate to obtain a composite cast ingot plate; wherein, the formula of the coating rate is as follows:
Figure BDA0002557297310000041
wherein a is the thickness of a coating layer of each milling surface; b is the thickness of the high-quality soaking ingot;
the thickness of the 1050 pure aluminum plate is 13-15 mm;
and when the high-quality soaking ingot is subjected to surface milling treatment, the surface milling depth is 20 mm.
Further, it is preferable that before the hot rolling of the composite ingot plate, the method further comprises:
performing surface brushing treatment on the clad material to remove an oxide layer on the surface;
and adopting aviation kerosene and sand paper to clean and polish the high-quality soaking cast ingot.
Further, it is preferable that the hot rolling treatment is performed on the composite ingot plate to obtain a hot-rolled composite ingot plate, including:
pushing the composite ingot plate into a stepping pushing furnace to heat to 400-480 ℃, and carrying out hot rough rolling, wherein 19-21 times of hot rough rolling are carried out, the first two times of welding rolling are carried out, the rolling reduction is 2-3 mm, the rolling speed is 0.35m/s, the later 17-19 times are carried out in a conventional rolling mode, the rolling reduction of each time is less than or equal to 27mm, the rolling speed is less than or equal to 2.0m/s, and the final rolling temperature is 300-320 ℃, so as to obtain the hot-rolled composite ingot plate;
in the process of carrying out hot rolling treatment on the composite ingot casting plate,
when the brush roller is opened in the 9 th pass, the brush roller is internally cooled for auxiliary lubrication;
at pass 13, the emulsion was fully opened to provide adequate lubrication.
Further, it is preferable that the cold rolling process is performed on the hot-rolled composite ingot plate to obtain a cold-rolled composite ingot plate, and the cold rolling process includes:
carrying out first cold rolling on the hot-rolled composite ingot plate, wherein the pressing rate of the first cold rolling is 12 +/-2%;
and carrying out second cold rolling on the composite ingot plate subjected to the first cold rolling, wherein the pressing rate of the second cold rolling is 13 +/-2%, so as to obtain the cold-rolled composite ingot plate.
In addition, preferably, in the process of annealing the cold-rolled composite ingot plate to obtain the O-state coated aluminum sheet,
preserving the heat of the cold-rolled composite ingot plate for 2 hours at the temperature of 340-380 ℃; then cooling, wherein the cooling rate is as follows: and (3) less than or equal to 15 ℃/h, and when the temperature is lower than 150 ℃, discharging the cold-rolled composite ingot plate out of the furnace to obtain the O-state coated aluminum sheet.
In addition, preferably, in the process of carrying out solution aging treatment on the O-state coated aluminum sheet to obtain the T4 or T42-state 2024 aluminum alloy coated aluminum sheet,
and (3) placing the O-state coated aluminum sheet obtained after annealing treatment at 480-485 ℃, preserving heat for 20-40 min, quenching, cooling to room temperature by water, and naturally aging for 96h to obtain the T4 or T42-state 2024 aluminum alloy coated aluminum sheet.
According to the technical scheme, the T4 or T42-state 2024 aluminum alloy aluminum-clad sheet provided by the invention ensures the uniformity of the thickness of the sheet and the thickness of the cladding layer and the uniformity of the grain structure by matching with hot rolling and cold rolling processes (the pressing amount and the rolling speed); the thickness of the coating layer can be designed according to the requirement of the thickness of the coating layer by taking the final coating layer thickness higher than the requirement of 50 percent as a standard for the thickness of the original slab ingot, the rolling process parameters and the like; the homogenization treatment is carried out on the aluminum alloy ingot, the uniformity of the annealed and recrystallized structure after cold rolling can be improved, and the uniformity of crystal grains can influence the roughness, the corrosion resistance and the like of the alloy. And the proper solid solution temperature is selected, so that residual second phases can be eliminated to the maximum extent, the higher supersaturated solid solution can be ensured, sufficient solute atoms are provided for subsequent natural aging, and the T42 state strength of the alloy reaches a higher level.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
FIG. 1 is a diagram of the coating treatment of the soaking ingot of the present invention;
FIG. 2 is a graph of clad thickness of an aluminum alloy-clad aluminum sheet according to the present invention;
FIG. 3 is a schematic view of the surface quality of the anodized aluminum-clad sheet of the present invention.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.
Aiming at the problems that the plate aluminum-coated thickness is not uniform, the aluminum-coated layer is cracked, the plate shape is difficult to control, the chemical milling roughness is poor and other comprehensive properties are low in the developing process of the conventional high-performance 2024 alloy T42 state aluminum-coated thin plate for aviation, the invention provides A T4 or T42 state 2024 aluminum alloy aluminum-coated thin plate, and the T42 state aluminum-coated thin plate for civil aircraft skin, which can comprehensively meet the performance requirements of AMS QQ-A-250/5 standard in all performance indexes, can be prepared by adopting the method provided by the invention.
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In order to illustrate the preparation method of the film-coated propping agent provided by the invention, a coating treatment diagram for a high-quality soaking ingot according to an embodiment of the invention is shown in fig. 1.
As shown in fig. 1, the T4 or T42 state 2024 aluminum alloy clad aluminum sheet provided by the invention comprises:
s110, carrying out two homogenization processes on the aluminum alloy ingot to obtain a high-quality soaking ingot with the volume fraction of the residual second phase less than 0.9%;
s120, coating the high-quality soaking ingot to obtain a composite ingot plate;
s130, carrying out hot rolling treatment on the composite ingot casting plate to obtain a hot-rolled composite ingot casting plate;
s140, performing cold rolling treatment on the hot-rolled composite ingot plate to obtain a cold-rolled composite ingot plate;
s150, annealing the cold-rolled composite ingot plate to obtain an O-state coated aluminum sheet;
and S160, carrying out solution aging treatment on the O-state coated aluminum sheet to obtain the T4 or T42-state 2024 aluminum alloy coated aluminum sheet.
By matching with hot rolling and cold rolling processes (pressing amount and rolling speed), the uniformity of the thickness of the plate and the thickness of a coating layer and the uniformity of a grain structure are ensured; the thickness of the coating layer can be designed according to the requirement of the thickness of the coating layer by taking the final coating layer thickness higher than the requirement of 50 percent as a standard for the thickness of the original slab ingot, the rolling process parameters and the like; the homogenization treatment is carried out on the aluminum alloy ingot, the uniformity of the annealed and recrystallized structure after cold rolling can be improved, and the uniformity of crystal grains can influence the roughness, the corrosion resistance and the like of the alloy. And the proper solid solution temperature is selected, so that residual second phases can be eliminated to the maximum extent, the higher supersaturated solid solution can be ensured, sufficient solute atoms are provided for subsequent natural aging, and the T42 state strength of the alloy reaches a higher level.
In a preferred embodiment of the present invention, the aluminum alloy ingot comprises the following elements: the steel is characterized by comprising the following components, by weight, less than 0.08% of Si, less than 0.20% of Fe, 4.4% -4.8% of Cu, 1.3% -1.7% of Mg, 0.4% -0.8% of Mn, less than 0.1% of Cr, less than 0.3% of Zn, less than 0.1% of Ti, other impurity elements, less than 0.05% of single element, less than 0.15% of total amount and the balance of aluminum.
The T4 or T42 state 2024 aluminum alloy coated aluminum sheet prepared by the aluminum alloy cast ingot has higher strength and better performance.
As the preferred scheme of the invention, before the aluminum alloy ingot is subjected to two homogenization processes to obtain the high-quality soaking ingot with the volume fraction of the residual second phase less than 0.9 percent, the method also comprises the following steps:
preparing an aluminum alloy ingot; wherein the content of the first and second substances,
preparing an aluminum alloy ingot, comprising:
adding the raw materials of the aluminum alloy sheet into a capacity furnace according to a preset raw material ratio, drying at 220 +/-10 ℃ for 40 +/-5 min, adding an electrolyte, and smelting at 740 +/-10 ℃ to obtain a mixed raw material melt; wherein the content of the first and second substances,
when the raw material of the aluminum alloy sheet begins to melt, adding a covering agent;
starting electromagnetic stirring after 60-70% of the raw material of the aluminum alloy sheet is melted;
after the raw materials of the aluminum alloy sheet are completely melted, adding an aluminum alloy element additive into the melted raw materials of the aluminum alloy sheet for component adjustment;
carrying out slag skimming treatment on the mixed raw material melt;
and transferring the mixed raw material melt subjected to slagging-off treatment to a heat preservation furnace, refining the mixed gas at the side of the heat preservation furnace for 40min +/-5 min, standing for 40min +/-5 min when the temperature of the mixed raw material melt reaches 705-710 ℃, filtering on line, and casting into an aluminum alloy ingot.
The aluminum alloy ingot prepared by the method has better quality, wherein in the preparation process of the aluminum alloy ingot, the online filtering comprises the following steps: SNIF degassing, adding a refiner (Al5Ti1B point input amount is 1.5-2.0kg/t), CCF double-layer filtering and the like; in the process, the hydrogen content is less than 0.08mL/100g, the Na content is less than 2ppm, and the Ca content is less than 3 ppm. The removal rate of the slag with the size of more than 20 mu m is more than 95 percent. Ensuring that the content of hydrogen and slag in the melt meets the requirement of aviation aluminum alloy. The cast aluminum alloy ingot is a flat ingot alloy with the thickness of 400-.
As a preferred scheme of the invention, the aluminum alloy ingot is subjected to two homogenization processes to obtain a high-quality soaking ingot with the volume fraction of the residual second phase less than 0.9%, and the method comprises the following steps:
carrying out stress relief treatment on the aluminum alloy cast ingot;
and (3) placing the aluminum alloy ingot subjected to stress relief treatment in a furnace, heating to 400-480 ℃, preserving heat for 45-50 h, and naturally cooling after discharging.
The two homogenization processes are adopted to consider the uniformity of the annealed and recrystallized structure after cold rolling, and the uniformity of crystal grains can influence the roughness, the corrosion resistance and the like of the alloy. And selecting proper solid solution temperature can eliminate residual second phase to the maximum extent, can ensure higher supersaturated solid solubility, provides sufficient solute atoms for subsequent natural aging, enables the alloy T42 state strength to reach a higher level, and determines the optimal homogenization process parameters through the research of large-size ingot casting homogenization process, so that the content of homogenized crystal phase is lower than 0.9%.
As a preferable aspect of the present invention, a composite ingot plate obtained by coating a high-quality soaking ingot comprises:
carrying out double-sided surface milling treatment on the high-quality soaking ingot to obtain a smooth surface ingot;
respectively coating each milled surface of the smooth cast ingot by adopting a 1050 pure aluminum plate to obtain a composite cast ingot plate; wherein, the formula of the coating rate is as follows:
Figure BDA0002557297310000091
wherein a is the thickness of a coating layer of each milling surface; b is the thickness of the high-quality soaking ingot;
1050 the thickness of the pure aluminum plate is 13mm-15 mm;
when the high-quality soaking ingot is subjected to surface milling treatment, the surface milling depth is 20 mm.
In the coating treatment process, the design target coating rate is 1.0 +/-0.4% higher than the coating rate required value required by the specification. If the coating rate is more than or equal to 2% according to the specification requirement of the T4 or T42 state 2024 aluminum alloy coated aluminum sheet with the thickness of 5.5mm-6.0mm, the coating sheet adopts a 13mm-15mm pure aluminum sheet. According to the requirement of the thickness of the coating layer, the thickness of the coating layer is designed by taking the final coating layer thickness higher than the required 50% allowance as a standard for the thickness of the original slab ingot, the rolling process parameters and the like.
As a preferable aspect of the present invention, before the hot rolling of the composite ingot plate, the method further comprises:
performing surface brushing treatment on the clad material to remove an oxide layer on the surface;
and adopting aviation kerosene and sand paper to clean and polish the high-quality soaking cast ingot.
Before production, the surface of the cladding material is brushed and ground to remove an oxide layer on the surface, so that the contact surface of the cladding material and the core cast ingot is effectively welded during welding rolling; aviation kerosene and abrasive paper are used for strictly cleaning and polishing the core cast ingot, so that oil stains and impurities on the surface are removed, and interlayer slag inclusion is avoided. So as to avoid the risk of "bagging" of the cladding sheet during subsequent use.
As a preferable aspect of the present invention, a hot rolling process is performed on a composite ingot plate to obtain a hot-rolled composite ingot plate, including:
pushing the composite ingot plate into a stepping pushing furnace to heat to 400-480 ℃, and carrying out hot rough rolling, wherein the hot rough rolling is carried out for 19-21 times, the previous two times of welding rolling is carried out, the rolling reduction is 2-3 mm, the rolling speed is 0.35m/s, the later 17-19 times of welding rolling adopt a conventional rolling mode, the rolling reduction of each time is less than or equal to 27mm, the rolling speed is less than or equal to 2.0m/s, and the final rolling temperature is 300-320 ℃, so as to obtain the hot-rolled composite ingot plate;
in the process of hot rolling the composite ingot plate,
when the brush roller is opened in the 9 th pass, the brush roller is internally cooled for auxiliary lubrication;
at pass 13, the emulsion was fully opened to provide adequate lubrication.
The hot rolling and cold rolling processes (the pressing amount and the rolling speed) are matched to ensure the uniformity of the thickness of the plate and the thickness of the cladding layer and the uniformity of the grain structure. The pass setting, the lubricant pass use and the cold rolling deformation control in the hot rolling process realize the design goal that the coating reaches more than 2 percent, and successfully ensure the problems of uneven thickness and poor surface quality of the coating layer; and the mass of the surface after anodic oxidation is more than B grade.
As a preferred aspect of the present invention, a cold-rolled composite ingot plate obtained by cold-rolling a hot-rolled composite ingot plate, comprises:
carrying out first cold rolling on the hot-rolled composite ingot plate, wherein the pressing rate of the first cold rolling is 12 +/-2%;
and carrying out second cold rolling on the composite ingot plate subjected to the first cold rolling, wherein the pressing rate of the second cold rolling is 13 +/-2%, so as to obtain the cold-rolled composite ingot plate.
Taking the preparation of a thin plate with the thickness of 5.5mm-6.0mm as an example, a composite ingot plate with the thickness of 7.0mm-8.0mm after hot rolling is subjected to 2 times of cold rolling to be 5.5mm-6.0mm, the reduction rate of the first cold rolling is controlled to be 12 +/-2%, and the reduction rate of the second cold rolling is controlled to be 13 +/-2%; after cold rolling, the design coating rate is guaranteed to reach 3.0-3.5%, the coating rate required by the specification is more than or equal to 2%, the coating rate is increased by about 50% compared with the coating rate required by the specification, and the difference between the maximum thickness point 5.725mm and the minimum thickness point 5.705mm of the plate coating is 0.02mm and is far lower than the required tolerance +/-0.4 mm. The surface quality is good, no crack and other defects are generated, and the problem of uneven thickness of the coating layer is solved well.
In the preferred embodiment of the invention, in the process of annealing the cold-rolled composite ingot plate to obtain the O-state coated aluminum sheet,
keeping the temperature of the cold-rolled composite ingot plate at 340-380 ℃ for 2 h; then cooling, wherein the cooling rate is as follows: and (3) less than or equal to 15 ℃/h, and when the temperature is lower than 150 ℃, discharging the cold-rolled composite ingot plate out of the furnace to obtain the O-state coated aluminum sheet. A structure with higher elongation and a completely recrystallized state is obtained.
In the preferable mode of the invention, in the process of carrying out solution aging treatment on the O-state coated aluminum sheet to obtain the T4 or T42-state 2024 aluminum alloy coated aluminum sheet,
and (3) placing the O-state coated aluminum sheet obtained after annealing treatment at 480-485 ℃, preserving heat for 20-40 min, quenching, cooling to room temperature by water, and naturally aging for 96h to obtain the T4 or T42-state 2024 aluminum alloy coated aluminum sheet. The T4 or T42 state 2024 aluminum alloy clad aluminum sheet can be obtained by carrying out solution aging treatment on the O state clad aluminum sheet.
The following are examples of the present invention.
Example 1
1. Through chemical analysis, the aluminum alloy cast ingot contains 0.05% of Si, 0.15% of Fe, 4.6% of Cu, 1.6% of Mg, 0.6% of Mn, 0.06% of Cr, 0.25% of Zn, 0.07% of Ti, 0.13% of the total of other impurity elements and the balance of aluminum.
2. After casting the aluminum alloy ingot, performing 2-pass homogenization heat treatment: the temperature is kept at 400 ℃ for 8h for stress relief annealing, the temperature is kept at 495 ℃ for 48h for homogenization treatment, the aluminum alloy ingot after soaking has no defects of overburning, looseness, non-metallic inclusion and the like, the second phase residue is less than 0.9 percent, and the quality of the ingot is excellent.
3. When the coating rate is designed, in order to ensure that the risk of 'package penetration' does not occur in the subsequent rolling process, the design coating rate is 1.0 +/-0.4% higher than the coating rate required value required by the specification;
4. and (3) pushing the composite ingot plate into a stepping pushing furnace to heat to 460 ℃, then adopting hot rough rolling, setting the hot rough rolling for 20 times, carrying out the first two times of welding rolling, controlling the reduction amount to be 2-3 mm, and the rolling speed to be 0.35m/s, closing the emulsion, and welding the coating material and the core material under pressure. And adopting a conventional rolling mode for the last 18 passes, wherein the reduction of each pass is 2027mm, the rolling speed is 1.5-2.0m/s, and the final rolling temperature is controlled to be 300-320 ℃, so that the hot-rolled composite aluminum plate with the thickness of 7.7mm is obtained.
5. In the lubricating process, the internal cooling auxiliary lubrication of the brush roll is started in the 9 th pass, and the emulsion is fully started in the 13 th pass to provide sufficient lubrication.
6. The cold rolling process comprises the following steps: and (3) carrying out 2 times of cold rolling on the hot-rolled 7.7 mm-thick plate to 5.7mm to obtain the cold-rolled composite aluminum plate.
7. Annealing process: keeping the temperature at 360 ℃ for 2h, cooling to room temperature at the cooling speed of 13 ℃/h, and discharging to obtain the O-state coated aluminum sheet.
8. Solid solution aging process: and taking the plate with the specified size from the annealed O-state clad aluminum sheet, putting the plate into a furnace at 480-.
Example 2
1. Through chemical analysis, the aluminum alloy cast ingot contains 0.05% of Si, 0.15% of Fe, 4.6% of Cu, 1.6% of Mg, 0.6% of Mn, 0.06% of Cr, 0.25% of Zn, 0.07% of Ti, 0.13% of the total of other impurity elements and the balance of aluminum.
2. After casting the aluminum alloy cast ingot, carrying out heat preservation at 500 ℃ for 47h for homogenization treatment, wherein the aluminum alloy cast ingot after soaking has no defects of overburning, looseness, non-metallic inclusions and the like, the second phase residue is less than 0.9%, and the cast ingot quality is excellent.
3. When the coating rate is designed, in order to ensure that the risk of 'package penetration' does not occur in the subsequent rolling process, the design coating rate is 1.0 +/-0.4% higher than the coating rate required value required by the specification;
4. and (3) pushing the composite ingot plate into a stepping pushing furnace to heat to 480 ℃, then adopting hot rough rolling, setting 21 times of hot rough rolling, carrying out the first two times of welding rolling, controlling the reduction amount to be 2-3 mm, and the rolling speed to be 0.35m/s, closing the emulsion, and welding the coating material and the core material under pressure. And adopting a conventional rolling mode for the next 19 passes, wherein the reduction of each pass is 17-25mm, the rolling speed is 1.3-1.8m/s, the final rolling temperature is controlled to be 300-320 ℃, and the thickness of the hot-rolled composite aluminum plate is 7.2 mm.
5. In the lubricating process, the internal cooling auxiliary lubrication of the brush roll is started in the 9 th pass, and the emulsion is fully started in the 13 th pass to provide sufficient lubrication.
6. The cold rolling process comprises the following steps: and (3) carrying out 2 times of cold rolling on the hot-rolled 7.2 mm-thick plate to 5.5mm to obtain the cold-rolled composite aluminum plate.
7. Annealing process: keeping the temperature at 370 ℃ for 2h, cooling to room temperature at the speed of 14 ℃/h, and discharging to obtain the O-state coated aluminum sheet.
8. Solid solution aging process: and taking the plate with the specified size from the annealed O-state clad aluminum sheet, putting the plate into a furnace at 480-.
Example 3
1. Through chemical analysis, the aluminum alloy cast ingot contains 0.05% of Si, 0.15% of Fe, 4.6% of Cu, 1.6% of Mg, 0.6% of Mn, 0.06% of Cr, 0.25% of Zn, 0.07% of Ti, 0.13% of the total of other impurity elements and the balance of aluminum.
2. After casting, the aluminum alloy cast ingot is subjected to heat preservation at 492 ℃ for 45h homogenization treatment, the aluminum alloy cast ingot after soaking is free from the defects of overburning, looseness, non-metallic inclusions and the like, the second phase residue is less than 0.9%, and the cast ingot quality is excellent.
3. When the coating rate is designed, in order to ensure that the risk of 'packet penetration' does not occur in the subsequent rolling process, the innovatively proposed design coating rate is 1.0 +/-0.4% higher than the coating rate required value required by the specification;
4. and (3) pushing the composite ingot plate into a stepping pushing furnace to heat to 430 ℃, then adopting hot rough rolling, setting 21 times of hot rough rolling, carrying out the first two times of welding rolling, controlling the reduction amount to be 2-3 mm, and the rolling speed to be 0.35m/s, closing the emulsion, and welding the coating material and the core material under pressure. And adopting a conventional rolling mode for the next 19 passes, wherein the reduction of each pass is 14-23mm, the rolling speed is 1.3-1.7m/s, the final rolling temperature is controlled to be 300-320 ℃, and the thickness of the hot-rolled composite aluminum plate is 7.4 mm.
5. In the lubricating process, the emulsion is fully started from the second time after the internal cooling auxiliary lubrication of the brush roll is started in the 13 th pass, so that sufficient lubrication is provided.
6. The cold rolling process comprises the following steps: and (3) carrying out 2 times of cold rolling on the hot-rolled 7.4 mm-thick plate to 5.8mm to obtain the cold-rolled composite aluminum plate.
7. Annealing process: keeping the temperature at 350 ℃ for 2h, cooling to room temperature at the cooling speed of 12 ℃/h, and discharging to obtain the O-state coated aluminum sheet.
8. Solid solution aging process: and taking the plate with the specified size from the annealed O-state coated aluminum sheet, putting the plate into a reaction chamber with 480 ℃ plus 485 ℃, preserving the heat for 35min, quenching, cooling the plate to room temperature by water, and naturally aging for 96h to obtain the T4 or T42-state 2024 aluminum alloy coated aluminum sheet.
The first table shows the performance tests of the T4 or T42 temper 2024 aluminum alloy clad aluminum sheets obtained in examples 1-3.
Figure BDA0002557297310000151
Watch 1
In conclusion, the aviation coated 2-series aluminum alloy sheets prepared in the embodiments 1 to 3 meet the AMS-QQ-A-250/5 standard requirements on comprehensive properties. The tensile strength is more than or equal to 410 MPa; the yield strength is more than or equal to 265 MPa; the elongation is more than or equal to 12 percent; the chemical milling roughness Ra is less than or equal to 1.6 mu m; the acid-washed anodized surface has no defects such as black lines, color difference, inclusions and the like, and the aviation coated 2-series aluminum alloy sheet prepared in the embodiments 1 to 3 has surface quality of oil mass and corrosion resistance, so that the performance of the existing aircraft skin can be improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A method for preparing an aluminum-clad sheet of T4 or T42-state 2024 aluminum alloy is characterized by comprising the following steps:
carrying out two-pass homogenization process treatment on the aluminum alloy ingot to obtain a high-quality soaking ingot with the volume fraction of the residual second phase less than 0.9%;
coating the high-quality soaking ingot to obtain a composite ingot plate;
carrying out hot rolling treatment on the composite ingot casting plate to obtain a hot-rolled composite ingot casting plate;
performing cold rolling treatment on the hot-rolled composite ingot plate to obtain a cold-rolled composite ingot plate;
annealing the cold-rolled composite ingot plate to obtain an O-state coated aluminum sheet;
and carrying out solution aging treatment on the O-state coated aluminum sheet to obtain the T4 or T42-state 2024 aluminum alloy coated aluminum sheet.
2. The method of claim 1, wherein the T4 or T42 state 2024 aluminum alloy clad aluminum sheet is made by the method,
the aluminum alloy cast ingot comprises the following elements: the steel is characterized by comprising the following components, by weight, less than 0.08% of Si, less than 0.20% of Fe, 4.4% -4.8% of Cu, 1.3% -1.7% of Mg, 0.4% -0.8% of Mn, less than 0.1% of Cr, less than 0.3% of Zn, less than 0.1% of Ti, other impurity elements, less than 0.05% of single element, less than 0.15% of total amount and the balance of aluminum.
3. The method for preparing the T4 or T42-state 2024 aluminum alloy coated aluminum sheet as claimed in claim 1, wherein before the aluminum alloy ingot is subjected to two homogenization processes to obtain a high-quality soaking ingot with the volume fraction of the residual second phase being less than 0.9%, the method further comprises the following steps:
preparing the aluminum alloy ingot; wherein the content of the first and second substances,
preparing the aluminum alloy ingot, comprising:
adding the raw materials of the aluminum alloy sheet into a capacity furnace according to a preset raw material ratio, drying at 220 +/-10 ℃ for 40 +/-5 min, adding an electrolyte, and smelting at 740 +/-10 ℃ to obtain a mixed raw material melt; wherein the content of the first and second substances,
adding a covering agent when the raw material of the aluminum alloy sheet begins to melt;
starting electromagnetic stirring after 60% -70% of the raw material of the aluminum alloy sheet is melted;
after the raw materials of the aluminum alloy sheet are completely melted, adding an aluminum alloy element additive into the melted raw materials of the aluminum alloy sheet for component adjustment;
carrying out slag skimming treatment on the mixed raw material melt;
and transferring the mixed raw material melt subjected to slagging-off treatment to a heat preservation furnace, refining mixed gas on the side of the heat preservation furnace for 40min +/-5 min, standing for 40min +/-5 min when the temperature of the mixed raw material melt reaches 705-710 ℃, and casting into an aluminum alloy cast ingot after online filtration.
4. The method for preparing the T4 or T42-state 2024 aluminum alloy coated aluminum sheet as claimed in claim 1, wherein the aluminum alloy ingot is subjected to two homogenization processes to obtain a high-quality soaking ingot with the volume fraction of the residual second phase less than 0.9%, and the method comprises the following steps:
carrying out stress relief treatment on the aluminum alloy cast ingot;
and (3) placing the aluminum alloy ingot subjected to stress relief treatment in a furnace, heating to 400-480 ℃, preserving heat for 45-50 h, and naturally cooling after discharging.
5. The method for preparing the aluminum-clad sheet of the T4 or T42-state 2024 aluminum alloy as claimed in claim 1, wherein the high-quality soaking ingot is clad to obtain a composite ingot plate, comprising:
carrying out double-sided surface milling treatment on the high-quality soaking ingot to obtain a smooth ingot;
respectively coating each milled surface of the smooth cast ingot by adopting a 1050 pure aluminum plate to obtain a composite cast ingot plate; wherein, the formula of the coating rate is as follows:
Figure FDA0002557297300000021
wherein a is the thickness of a coating layer of each milling surface; b is the thickness of the high-quality soaking ingot;
the thickness of the 1050 pure aluminum plate is 13-15 mm;
and when the high-quality soaking ingot is subjected to surface milling treatment, the surface milling depth is 20 mm.
6. The method of claim 1, wherein the hot rolling of the composite ingot plate is preceded by the step of preparing the T4 or T42 state 2024 aluminum alloy coated aluminum sheet, further comprising:
performing surface brushing treatment on the clad material to remove an oxide layer on the surface;
and adopting aviation kerosene and sand paper to clean and polish the high-quality soaking cast ingot.
7. The method of claim 1, wherein the hot rolling of the composite ingot plate to obtain a hot rolled composite ingot plate comprises:
pushing the composite ingot plate into a stepping pushing furnace to heat to 400-480 ℃, and carrying out hot rough rolling, wherein 19-21 times of hot rough rolling are carried out, the first two times of welding rolling are carried out, the rolling reduction is 2-3 mm, the rolling speed is 0.35m/s, the later 17-19 times are carried out in a conventional rolling mode, the rolling reduction of each time is less than or equal to 27mm, the rolling speed is less than or equal to 2.0m/s, and the final rolling temperature is 300-320 ℃, so as to obtain the hot-rolled composite ingot plate;
in the process of carrying out hot rolling treatment on the composite ingot casting plate,
when the brush roller is opened in the 9 th pass, the brush roller is internally cooled for auxiliary lubrication;
at pass 13, the emulsion was fully opened to provide adequate lubrication.
8. The method for preparing the T4 or T42-state 2024 aluminum alloy coated aluminum sheet as claimed in claim 1, wherein the step of performing cold rolling treatment on the hot-rolled composite ingot plate to obtain a cold-rolled composite ingot plate comprises the following steps:
carrying out first cold rolling on the hot-rolled composite ingot plate, wherein the pressing rate of the first cold rolling is 12 +/-2%;
and carrying out second cold rolling on the composite ingot plate subjected to the first cold rolling, wherein the pressing rate of the second cold rolling is 13 +/-2%, so as to obtain the cold-rolled composite ingot plate.
9. The method for preparing the aluminum-clad sheet of the T4 or T42 state 2024 aluminum alloy as claimed in claim 1, wherein in the process of annealing the cold-rolled composite ingot plate to obtain the O state clad aluminum sheet,
preserving the heat of the cold-rolled composite ingot plate for 2 hours at the temperature of 340-380 ℃; then cooling, wherein the cooling rate is as follows: and (3) less than or equal to 15 ℃/h, and when the temperature is lower than 150 ℃, discharging the cold-rolled composite ingot plate out of the furnace to obtain the O-state coated aluminum sheet.
10. The method for preparing the T4 or T42 state 2024 aluminum alloy coated aluminum sheet as claimed in claim 1, wherein during the solution aging treatment of the O state coated aluminum sheet to obtain the T4 or T42 state 2024 aluminum alloy coated aluminum sheet,
and (3) placing the O-state coated aluminum sheet obtained after annealing treatment at 480-485 ℃, preserving heat for 20-40 min, quenching, cooling to room temperature by water, and naturally aging for 96h to obtain the T4 or T42-state 2024 aluminum alloy coated aluminum sheet.
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