5052 aluminum alloy foil, preparation method thereof and air conditioner radiator fin

Abstract

The invention provides a 5052 aluminum alloy foil, a preparation method thereof and an air conditioner radiator fin, and the preparation method of the 5052 aluminum alloy foil comprises the following steps: smelting and casting an aluminum alloy raw material to obtain a 5052 aluminum alloy cast ingot; a 5052 aluminum alloy cast ingot is subjected to homogenizing heat treatment and then hot-rolled to the thickness of 4-5 mm, and a hot-rolled blank is obtained; and after the hot-rolled blank is subjected to cold rolling till the thickness ranges from 0.4 mm to 0.5 mm, the foil is rolled till the thickness ranges from 0.080 mm to 0.085 mm, and the 5052 aluminum alloy foil is obtained. According to the 5052 aluminum alloy foil, the preparation method of the 5052 aluminum alloy foil and the air conditioner radiator fin, a foil product with the thickness of 0.080-0.085 mm can be produced, and the tensile strength and the corrosion resistance are greatly improved on the premise that the high elongation of a finished product is kept.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy casting, and in particular to a 5052 aluminum alloy foil material and a preparation method thereof, and an air conditioner radiator fin. Background Art

[0002] With the development of my country's economy and the continuous improvement of people's living standards, the popularity of air conditioners has increased year by year. Aluminum alloys are widely used in the production of air conditioner heat exchangers due to their low density, high specific strength, good thermal conductivity, easy processing and high cost performance. In recent years, air conditioners have gradually developed in the direction of miniaturization, high efficiency and long life. Therefore, the requirements for air conditioner radiators have gradually increased. Aluminum foil for air conditioner radiators has developed in the direction of ultra-thinness, high tensile strength, high deformability and high corrosion resistance.

[0003] For example, the thickness of aluminum foil for air conditioner radiators has developed from the original thinnest 0.08mm to 0.04mm. With the trend of aluminum foil for air conditioner radiators becoming thinner, the requirements for tensile strength, elongation and corrosion resistance have also increased. The most commonly used aluminum alloy foil for air conditioner radiators are 3102, 8011 and other Al-Mn-Fe-Si series aluminum alloys. Due to the high content of alloying elements such as Mn, Si, and Fe, they will produce strengthening effects such as solid solution, fine grains, and work hardening. These alloying elements have limited effects on strength and elongation, and it is increasingly difficult to meet the requirements. At the same time, the products produced by 3102, 8011 and other Al-Mn-Fe-Si series aluminum alloys have unstable organization and performance, and the foil is prone to coarse grains, resulting in extremely poor deformation performance and easy cracking, which greatly reduces the yield rate. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a 5052 aluminum alloy foil and a preparation method thereof and an air conditioner radiator fin, which can produce foil products with a thickness of 0.080-0.085 mm, greatly improving the tensile strength and corrosion resistance while maintaining a high finished product elongation.

[0005] The present invention provides a method for preparing a 5052 aluminum alloy foil, comprising the following steps:

[0006] S1, smelting and casting the aluminum alloy raw material to obtain a 5052 aluminum alloy ingot;

[0007] S2, after homogenizing heat treatment of the 5052 aluminum alloy ingot, hot rolling to a thickness of 4-5 mm to obtain a hot-rolled billet;

[0008] S3. After the hot-rolled billet is cold-rolled to a thickness of 0.4-0.5 mm, the foil is rolled to a thickness of 0.080-0.085 mm, thereby obtaining the 5052 aluminum alloy foil.

[0009] In the present invention, the aluminum alloy raw material is melted and cast after being batched to obtain an aluminum alloy ingot, and then the aluminum alloy ingot is subjected to a homogenization treatment, hot rolling, cold rolling, and foil rolling to prepare a 5052 aluminum alloy foil. When the 5052 aluminum alloy foil is used to manufacture air conditioner radiator fins, the tensile strength can be maintained to be above 200 MPa while ensuring that the elongation of the aluminum foil product, i.e., the air conditioner radiator fin, is high, so that the strength of the product obtained after the fin is punched is very high.

[0010] Preferably, the composition of the 5052 aluminum alloy includes, by weight percentage: Mg: 2.2-2.5%, Fe: 0.1-0.3%, Mn: 0.05-0.1%, Cr: 0.1-0.4%, Cu: 0.05-0.08%, Zn: 0.05-0.1%, Si: ≤0.06%, V: ≤0.05%, Ti: ≤0.015%, and the balance is Al;

[0011] In the present invention, the design principle of each chemical element in the composition of 5052 aluminum alloy is as follows: Mg is used as the main alloy element, which can play the role of work hardening and solid solution strengthening at the same time. By controlling the Mg content, strengthening phases such as α (Al) and β (Mg5Al8) are formed to improve the mechanical properties of the 5052 aluminum alloy; Mn, Cr, Cu and the like are used as trace elements in the aluminum alloy, which promote the nucleation of crystallization by forming dispersed compounds with the effect of particle induced nucleation (PSN effect), pin the grain boundary, and inhibit the growth of grains, thereby playing a strengthening role; Fe and Si are usually impurity elements in the aluminum alloy. In the 5052 aluminum alloy of the present invention, by controlling the Fe content, it plays a certain role in refining grains, and also participates in the formation of AlMnFe phase, and can interact with Si to form AlMnFeSi phase, which plays a role in controlling the size and morphology of the Mn-containing phase, and is beneficial to improving the elongation of the alloy; trace Zn element can precipitate T phase (Al-Zn-Mg ternary phase), which reduces the number of precipitated phases at the grain boundary and improves the intergranular corrosion resistance of the aluminum alloy.

[0012] Preferably, the composition of the 5052 aluminum alloy further includes: Zr: 0.1-0.2%, and the contents of Fe and Mn satisfy: Fe / Mn=2-4.

[0013] In the present invention, by adding a certain amount of Zr on the basis of the formula of 5052 aluminum alloy, and controlling the content ratio of Fe / Mn to 2-4, not only the strength and plasticity of the aluminum foil product processed from 5052 aluminum alloy can be improved, but also the deep drawing performance can be optimized: since Zr is a transition metal element that can greatly improve the comprehensive performance of aluminum alloy, controlling the content of Zr in the aluminum alloy can make Zr effectively dissolved in the aluminum matrix, and spherical Al3Zr phase will precipitate at a certain temperature. The Al3Zr phase is dispersed in the matrix and has a coherent relationship with the matrix, so that the comprehensive performance of the aluminum alloy can be greatly improved; however, whether the Zr element can form a spherical Al3Zr phase when dissolved in the aluminum matrix is ​​not only controlled by the amount of Zr added, but also depends on the influence of other alloying elements in the aluminum alloy matrix. The inventors found that the solid solution phase of the Zr element is affected by the Fe impurity element. By controlling the Fe / Mn content ratio to 1-5, the Fe impurity atoms can be combined with Mn on a large scale to generate Al6(Fe Mn) phase, which not only offsets the negative impact of Fe on the alloy, but also avoids affecting the solid solution state of Zr element, ensuring the generation of required Al3Zr phase particles, so that the rolled alloy can maintain a small angle grain boundary state and improve the strength. At the same time, the small angle grain boundary is more conducive to the improvement of corrosion resistance.

[0014] Preferably, step S1 specifically comprises: adding the aluminum alloy raw material into a smelting furnace to melt into a liquid state, after slagging, adding it into a refining furnace for refining, then introducing an inert gas for degassing, filtering, refining, and casting to obtain the 5052 aluminum alloy ingot;

[0015] Preferably, the melting temperature is 730-750°C, the refining temperature is 715-735°C, and the casting temperature is 710-740°C;

[0016] Preferably, the refiner used in the refinement is Al-Ti-B, preferably Al-3Ti-1B or Al-5Ti-0.2B;

[0017] Preferably, the ingot thickness is 490-530 mm.

[0018] Preferably, the homogenization heat treatment temperature is 430-460° C. and the time is 3-5 hours.

[0019] Preferably, the hot rolling start temperature is 410-450°C, and the final rolling temperature is 240-270°C;

[0020] Preferably, the total hot rolling deformation is not less than 90%.

[0021] Preferably, the total cold rolling deformation is not less than 90%;

[0022] Preferably, the intermediate annealing temperature during the cold rolling process is 300-350° C. and the time is 4-7 hours.

[0023] Preferably, the total deformation of the foil rolling is not less than 80%.

[0024] Preferably, the preparation method further comprises S4, annealing the finished 5052 aluminum alloy foil;

[0025] Preferably, the finished product annealing temperature is 150-200°C.

[0026] Preferably, the preparation method further comprises S5, dipping the 5052 aluminum alloy foil in a corrosion-resistant coating;

[0027] Preferably, the corrosion-resistant coating comprises acrylamide, 4-vinylbenzo-18-crown-6, sodium silicate and initiator in a mass ratio of 10:1-3:1-2:0.01-0.03.

[0028] In the present invention, a 5052 aluminum alloy foil is dip-coated with a coating containing acrylamide, 4-vinylbenzo-18-crown-6, sodium silicate and an initiator. During the dipping process, acrylamide and 4-vinylbenzo-18-crown-6 are copolymerized in the presence of an initiator to form a copolymer containing amide and crown ether groups. The polar effect of the amide group enables the copolymer to be effectively adsorbed on the surface of the foil, while the cyclic ether structure of the crown ether group can form a complex with sodium ions, thereby causing sodium silicate to be precipitated on the surface of the aluminum alloy. Finally, a coating film composed of the acrylamide-crown ether copolymer and the sodium silicate is formed on the surface of the foil, and the coating film enables the aluminum alloy foil to have excellent corrosion resistance.

[0029] The present invention also provides a 5052 aluminum alloy foil, which is prepared by the above preparation method.

[0030] The present invention also provides an air conditioner radiator fin, which is made of the above-mentioned 5052 aluminum alloy foil.

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows: the 5052 aluminum alloy foil and the preparation method thereof disclosed in the present invention take the 5052 aluminum alloy as the processing object, reasonably design the alloy composition, casting parameters and rolling process, and produce foil with high elongation, high tensile strength and high corrosion resistance, thereby providing a new production process for the production of air conditioner radiator fins. DETAILED DESCRIPTION

[0032] The technical solutions of the present invention are described in detail below through specific embodiments. However, it should be clearly stated that these embodiments are for illustration only and are not to be construed as limiting the scope of the present invention.

[0033] Example 1

[0034] The present embodiment provides a method for preparing a 5052 aluminum alloy foil, which specifically comprises the following steps:

[0035] (1) The aluminum alloy raw material is prepared according to the composition described in Table 1 below, and the prepared aluminum alloy raw material is added to a smelting furnace to be smelted into a liquid state at a smelting temperature of 740°C. After stirring and slagging, the raw material is added to a refining furnace for refining at a refining temperature of 725°C. After refining, the raw material is allowed to stand for 20 minutes, and high-purity argon gas is introduced into the refining furnace and stirred. The impurity gas in the melt is removed by using the high-purity argon gas, and then the degassed melt is filtered using a foam ceramic filter plate with a pore size of ≥50ppi, and then an Al-3Ti-1B wire refiner is used for online refinement, and then the melt is cast at a casting temperature of 725°C to obtain an aluminum alloy ingot with a thickness of 510 mm;

[0036] (2) adding the aluminum alloy ingot to a heating furnace for homogenization heat treatment at a temperature of 445° C. for 4 h, and then hot rolling the ingot using a hot rolling mill at a starting rolling temperature of 430° C. and a final rolling temperature of 255° C. to obtain a hot-rolled billet with a thickness of 4.6 mm;

[0037] (3) cold rolling the hot rolled billet using a cold rolling mill, wherein the cold rolling includes seven passes, the first pass is pressed to 3.5 mm, the second pass is pressed to 2.4 mm, the third pass is pressed to 1.8 mm, the fourth pass is pressed to 1.4 mm, the fifth pass is pressed to 0.92 mm, the sixth pass is pressed to 0.69 mm, and the seventh pass is pressed to 0.47 mm, and then the billet is placed in a heating furnace for intermediate annealing at a temperature of 330° C. for 5 h, cooled to room temperature and taken out of the furnace to obtain a cold rolled billet; foil rolling the cold rolled billet in an aluminum foil rolling mill, wherein the foil rolling includes two passes, the first pass is pressed to 0.26 mm, and the second pass is pressed to 0.083 mm, to obtain an aluminum foil billet;

[0038] (4) The aluminum foil blank is placed in a heating furnace for annealing at a temperature of 180° C., thereby obtaining the 5052 aluminum alloy foil.

[0039] Example 2

[0040] The present embodiment provides a method for preparing a 5052 aluminum alloy foil, which specifically comprises the following steps:

[0041] (1) The aluminum alloy raw material is prepared according to the composition described in Table 1 below, and the prepared aluminum alloy raw material is added to a smelting furnace to be melted into a liquid state at a smelting temperature of 730°C. After stirring and slagging, the raw material is added to a refining furnace for refining at a refining temperature of 735°C. After refining, the raw material is allowed to stand for 20 minutes, and high-purity argon gas is introduced into the refining furnace and stirred. The impurity gas in the melt is removed by the high-purity argon gas, and then the degassed melt is filtered using a foam ceramic filter plate with a pore size of ≥50ppi, and then an Al-5Ti-0.2B wire refiner is used for online refinement, and then the melt is cast at a casting temperature of 710°C to obtain an aluminum alloy ingot with a thickness of 530 mm;

[0042] (2) adding the aluminum alloy ingot to a heating furnace for homogenization heat treatment at a temperature of 430° C. for 5 h, and hot rolling using a hot rolling mill after being taken out of the furnace, with a starting rolling temperature of 410° C. and a final rolling temperature of 270° C. to obtain a hot-rolled billet with a thickness of 5.0 mm;

[0043] (3) cold rolling the hot rolled billet using a cold rolling mill, wherein the cold rolling includes seven passes, the first pass is pressed to 3.7 mm, the second pass is pressed to 2.6 mm, the third pass is pressed to 1.9 mm, the fourth pass is pressed to 1.5 mm, the fifth pass is pressed to 0.99 mm, the sixth pass is pressed to 0.74 mm, and the seventh pass is pressed to 0.50 mm, and then the billet is placed in a heating furnace for intermediate annealing at a temperature of 350° C. for 4 h, cooled to room temperature and removed from the furnace to obtain a cold rolled billet; foil rolling the cold rolled billet using an aluminum foil rolling mill, wherein the foil rolling includes two passes, the first pass is pressed to 0.30 mm, and the second pass is pressed to 0.085 mm, to obtain an aluminum foil billet;

[0044] (4) The aluminum foil blank is placed in a heating furnace for annealing at a temperature of 150° C., thereby obtaining the 5052 aluminum alloy foil.

[0045] Example 3

[0046] The present embodiment provides a method for preparing a 5052 aluminum alloy foil, which specifically comprises the following steps:

[0047] (1) The aluminum alloy raw material is prepared according to the composition described in Table 1 below, and the prepared aluminum alloy raw material is added to a smelting furnace to be melted into a liquid state at a smelting temperature of 750°C. After stirring and slagging, the raw material is added to a refining furnace for refining at a refining temperature of 715°C. After refining, the raw material is allowed to stand for 20 minutes, and high-purity argon gas is introduced into the refining furnace and stirred. The impurity gas in the melt is removed by using the high-purity argon gas, and then the degassed melt is filtered using a foam ceramic filter plate with a pore size of ≥50ppi, and then an Al-3Ti-1B wire refiner is used for online refinement, and then the melt is cast at a casting temperature of 740°C to obtain an aluminum alloy ingot with a thickness of 490 mm;

[0048] (2) adding the aluminum alloy ingot to a heating furnace for homogenization heat treatment at a temperature of 460° C. for 3 h, and then hot rolling the ingot using a hot rolling mill at a starting rolling temperature of 450° C. and a final rolling temperature of 240° C. to obtain a hot-rolled billet with a thickness of 4.0 mm;

[0049] (3) cold rolling the hot rolled billet using a cold rolling mill, wherein the cold rolling includes seven passes, the first pass is pressed to 3.3 mm, the second pass is pressed to 2.2 mm, the third pass is pressed to 1.7 mm, the fourth pass is pressed to 1.3 mm, the fifth pass is pressed to 0.85 mm, the sixth pass is pressed to 0.61 mm, and the seventh pass is pressed to 0.40 mm, and then the billet is placed in a heating furnace for intermediate annealing at a temperature of 300° C. for 7 hours, cooled to room temperature and taken out of the furnace to obtain a cold rolled billet; foil rolling the cold rolled billet in an aluminum foil rolling mill, wherein the foil rolling includes two passes, the first pass is pressed to 0.25 mm, and the second pass is pressed to 0.080 mm, to obtain an aluminum foil billet;

[0050] (4) The aluminum foil blank is placed in a heating furnace for annealing at a temperature of 200° C., thereby obtaining the 5052 aluminum alloy foil.

[0051] Example 4

[0052] The present embodiment provides a method for preparing a 5052 aluminum alloy foil, which specifically comprises the following steps:

[0053] (1) The aluminum alloy raw material is prepared according to the composition described in Table 1 below, and the prepared aluminum alloy raw material is added to a smelting furnace to be smelted into a liquid state at a smelting temperature of 740°C. After stirring and slagging, the raw material is added to a refining furnace for refining at a refining temperature of 725°C. After refining, the raw material is allowed to stand for 20 minutes, and high-purity argon gas is introduced into the refining furnace and stirred. The impurity gas in the melt is removed by using the high-purity argon gas, and then the degassed melt is filtered using a foam ceramic filter plate with a pore size of ≥50ppi, and then an Al-3Ti-1B wire refiner is used for online refinement, and then the melt is cast at a casting temperature of 725°C to obtain an aluminum alloy ingot with a thickness of 510 mm;

[0054] (2) adding the aluminum alloy ingot to a heating furnace for homogenization heat treatment at a temperature of 445° C. for 4 h, and then hot rolling the ingot using a hot rolling mill at a starting rolling temperature of 430° C. and a final rolling temperature of 255° C. to obtain a hot-rolled billet with a thickness of 4.6 mm;

[0055] (3) cold rolling the hot rolled billet using a cold rolling mill, wherein the cold rolling includes seven passes, the first pass is pressed to 3.5 mm, the second pass is pressed to 2.4 mm, the third pass is pressed to 1.8 mm, the fourth pass is pressed to 1.4 mm, the fifth pass is pressed to 0.92 mm, the sixth pass is pressed to 0.69 mm, and the seventh pass is pressed to 0.47 mm, and then the billet is placed in a heating furnace for intermediate annealing at a temperature of 330° C. for 5 h, cooled to room temperature and taken out of the furnace to obtain a cold rolled billet; foil rolling the cold rolled billet in an aluminum foil rolling mill, wherein the foil rolling includes two passes, the first pass is pressed to 0.26 mm, and the second pass is pressed to 0.083 mm, to obtain an aluminum foil billet;

[0056] (4) The aluminum foil blank is placed in a heating furnace for annealing at a temperature of 180° C., thereby obtaining the 5052 aluminum alloy foil.

[0057] Example 5

[0058] The present embodiment provides a method for preparing a 5052 aluminum alloy foil, which specifically comprises the following steps:

[0059] (1) The aluminum alloy raw material is prepared according to the composition described in Table 1 below, and the prepared aluminum alloy raw material is added to a smelting furnace to be smelted into a liquid state at a smelting temperature of 740°C. After stirring and slagging, the raw material is added to a refining furnace for refining at a refining temperature of 725°C. After refining, the raw material is allowed to stand for 20 minutes, and high-purity argon gas is introduced into the refining furnace and stirred. The impurity gas in the melt is removed by using the high-purity argon gas, and then the degassed melt is filtered using a foam ceramic filter plate with a pore size of ≥50ppi, and then an Al-3Ti-1B wire refiner is used for online refinement, and then the melt is cast at a casting temperature of 725°C to obtain an aluminum alloy ingot with a thickness of 510 mm;

[0060] (2) adding the aluminum alloy ingot to a heating furnace for homogenization heat treatment at a temperature of 445° C. for 4 h, and then hot rolling the ingot using a hot rolling mill at a starting rolling temperature of 430° C. and a final rolling temperature of 255° C. to obtain a hot-rolled billet with a thickness of 4.6 mm;

[0061] (3) cold rolling the hot rolled billet using a cold rolling mill, wherein the cold rolling includes seven passes, the first pass is pressed to 3.5 mm, the second pass is pressed to 2.4 mm, the third pass is pressed to 1.8 mm, the fourth pass is pressed to 1.4 mm, the fifth pass is pressed to 0.92 mm, the sixth pass is pressed to 0.69 mm, and the seventh pass is pressed to 0.47 mm, and then the billet is placed in a heating furnace for intermediate annealing at a temperature of 330° C. for 5 h, cooled to room temperature and taken out of the furnace to obtain a cold rolled billet; foil rolling the cold rolled billet in an aluminum foil rolling mill, wherein the foil rolling includes two passes, the first pass is pressed to 0.26 mm, and the second pass is pressed to 0.083 mm, to obtain an aluminum foil billet;

[0062] (4) adding the aluminum foil blank to a heating furnace for annealing at a temperature of 180° C. to obtain a primary aluminum alloy foil;

[0063] (5) The aluminum alloy foil is immersed in an aqueous solution containing acrylamide, 4-vinylbenzo-18-crown ether-6, sodium silicate, potassium persulfate and sodium bisulfite in a mass ratio of 10:2:1:0.01:0.01, the concentration of sodium silicate is 0.05 g / L, and treated at 80° C. for 72 h. After being taken out, it is washed with water and dried to obtain the 5052 aluminum alloy foil.

[0064] Comparative Example 1

[0065] The preparation method of a 5052 aluminum alloy foil proposed in this comparative example is specifically referred to Example 1, except that in step (1), the aluminum alloy raw material is configured according to the components described in Table 1 below.

[0066] Comparative Example 2

[0067] The preparation method of a 5052 aluminum alloy foil proposed in this comparative example is specifically referred to Example 5, except that in step (5), the aluminum alloy foil is immersed in an aqueous solution containing acrylamide, sodium silicate, potassium persulfate and sodium bisulfite in a mass ratio of 10:2:0.01:0.01.

[0068] The composition and content of the aluminum alloy ingots in the embodiments and comparative examples are shown in Table 1:

[0069] Table 1 5052 aluminum alloy composition content (wt%)

[0070] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Mg 2.363 2.212 2.495 2.363 2.363 2.363 Fe 0.181 0.294 0.103 0.181 0.181 0.287 Mn 0.073 0.052 0.098 0.073 0.073 0.061 Cr 0.252 0.380 0.103 0.252 0.252 0.252 Cu 0.061 0.052 0.079 0.061 0.061 0.061 Zn 0.083 0.099 0.055 0.083 0.083 0.083 Si 0.035 0.036 0.037 0.035 0.035 0.035 V 0.022 0.020 0.021 0.022 0.022 0.022 Ti 0.005 0.005 0.006 0.005 0.005 0.005 Zr / / / 0.156 / 0.156 Fe / Mn 2.48 5.65 1.05 2.48 2.48 4.70 Al margin margin margin margin margin margin

[0071] The properties of the aluminum alloy foil obtained in the embodiment are shown in Table 2:

[0072] Table 2 Properties of 5052 aluminum alloy foil

[0073]

[0074]

[0075] Neutral salt spray resistance: spray chamber temperature 35±2℃, salt water concentration 5±1% NaCl solution, spray solution pH is neutral (pH 6.5-7.2), continuous spray.

[0076] As can be seen from the above table, the present invention uses 5052 aluminum alloy as the processing object, reasonably designs the alloy composition, casting parameters and rolling process, and produces foil with high elongation, high tensile strength and high corrosion resistance, providing a new production process for the production of air conditioner radiator fins.

[0077] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a 5052 aluminum alloy foil, characterized in that: The steps include: S1, smelting and casting the aluminum alloy raw material to obtain a 5052 aluminum alloy ingot; S2, after homogenizing heat treatment of the 5052 aluminum alloy ingot, hot rolling to a thickness of 4-5 mm to obtain a hot-rolled billet; S3. After the hot-rolled billet is cold-rolled to a thickness of 0.4-0.5 mm, the foil is rolled to a thickness of 0.080-0.085 mm, thereby obtaining the 5052 aluminum alloy foil.

2. The method for preparing the 5052 aluminum alloy foil according to claim 1, characterized in that: The composition of the 5052 aluminum alloy includes, by weight percentage: Mg: 2.2-2.5%, Fe: 0.1-0.3%, Mn: 0.05-0.1%, Cr: 0.1-0.4%, Cu: 0.05-0.08%, Zn: 0.05-0.1%, Si: ≤0.06%, V: ≤0.05%, Ti: ≤0.015%, and the balance is Al; Preferably, the composition of the 5052 aluminum alloy further includes: Zr: 0.1-0.2%, and the contents of Fe and Mn satisfy: Fe / Mn=2-4.

3. The method for preparing the 5052 aluminum alloy foil according to claim 1 or 2, characterized in that: Step S1 specifically comprises: adding the aluminum alloy raw material into a smelting furnace to melt into a liquid state, after slagging, adding the raw material into a refining furnace for refining, then introducing an inert gas for degassing, filtering, refining, and casting to obtain the 5052 aluminum alloy ingot; Preferably, the melting temperature is 730-750°C, the refining temperature is 715-735°C, and the casting temperature is 710-740°C; Preferably, the refiner used in the refinement is Al-Ti-B, preferably Al-3Ti-1B or Al-5Ti-0.2B; Preferably, the ingot thickness is 490-530 mm.

4. The method for preparing the 5052 aluminum alloy foil according to any one of claims 1 to 3, characterized in that: The homogenization heat treatment temperature is 430-460° C. and the time is 3-5 hours.

5. The method for preparing the 5052 aluminum alloy foil according to any one of claims 1 to 4, characterized in that: The hot rolling start temperature is 410-450°C, and the final rolling temperature is 240-270°C; Preferably, the total hot rolling deformation is not less than 90%.

6. The method for preparing the 5052 aluminum alloy foil according to any one of claims 1 to 5, characterized in that: The total cold rolling deformation is not less than 90%; Preferably, the intermediate annealing temperature during the cold rolling process is 300-350° C. and the time is 4-7 hours.

7. The method for preparing the 5052 aluminum alloy foil according to any one of claims 1 to 6, characterized in that: The total deformation of the foil rolling is not less than 80%.

8. The method for preparing the 5052 aluminum alloy foil according to any one of claims 1 to 7, characterized in that: It also includes S4, annealing the finished 5052 aluminum alloy foil; Preferably, the finished product annealing temperature is 150-200°C.

9. A 5052 aluminum alloy foil, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 8.

10. An air conditioner radiator fin, characterized in that: It is made of the 5052 aluminum alloy foil described in claim 9.

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