High-strength corrosion-resistant aluminum alloy material and production process thereof

Abstract

The invention belongs to the technical field of aluminum alloy materials, and provides a high-strength corrosion-resistant aluminum alloy material and a production process thereof.The high-strength corrosion-resistant aluminum alloy material comprises, by mass, 5.5%-7.0% of Zn, 2.0%-2.5% of Mg, 1.5%-2.5% of Cu, 0.15%-0.3% of Fe, 0.06%-0.08% of Si, 0.20%-0.25% of Cr, 0.03%-0.05% of Ti, 0.01%-0.03% of Mn, 0.04%-0.06% of Sr, 0.03%-0.05% of modified graphene, less than 0.1% of impurities and the balance Al. The high-strength corrosion-resistant aluminum alloy material provided by the invention has the advantages of high strength, high toughness, corrosion resistance and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum alloy materials, and particularly relates to a high-strength corrosion-resistant aluminum alloy material and its production process. Background Art

[0002] Aluminum alloys are widely used in the aerospace field as structural and functional components due to their low density, good mechanical properties, and good corrosion resistance, and play an important role in reducing the structural mass of spacecraft, increasing flight speed, and reducing energy consumption.

[0003] With the rapid development of science and technology and industrial economy, the demand for aluminum alloys is increasing day by day, and a series of requirements such as high load, light weight, high strength, high toughness, high modulus, and good corrosion resistance are put forward. Existing high-strength aluminum alloys usually use elements such as silicon, copper, and magnesium for alloying to enhance the strength, hardness, and corrosion resistance of the materials. In practical applications, these alloying elements have the following problems: (1) The proportion of alloying elements in traditional high-strength aluminum alloys is often based on experience or certain standard formulas, lacking optimization for specific application requirements, which results in deficiencies in certain specific properties of the alloy, such as insufficient high-temperature stability, fatigue resistance, or corrosion resistance, and it is difficult to meet the increasingly stringent requirements of modern industry for material properties; (2) In high-strength aluminum alloys, trace elements such as iron and titanium have an important impact on the comprehensive properties of the materials. In the existing technology, how to accurately control the content of these elements and make them evenly distributed in the alloy is still an operation difficulty. If not handled properly, these elements may form harmful phases, leading to a decrease in the mechanical properties of the alloy and increasing the brittleness of the material.

[0004] Therefore, it is an urgent technical problem at present to develop an aluminum alloy material with high strength, uniformity, excellent wear resistance, and corrosion resistance. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-strength corrosion-resistant aluminum alloy material and its production process to solve the problems of low strength and poor corrosion resistance of aluminum alloy materials in the existing technology.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The first aspect of the present invention provides a high-strength corrosion-resistant aluminum alloy material, including the following components by mass percentage: Zn 5.5 - 7.0%, Mg 2.0 - 2.5%, Cu 1.5 - 2.5%, Fe 0.15 - 0.3%, Si 0.06 - 0.08%, Cr 0.20 - 0.25%, Ti 0.03 - 0.05%, Mn 0.01 - 0.03%, Sr 0.04 - 0.06%, modified graphene 0.03 - 0.05%, impurities < 0.1%, and the balance is Al.

[0008] As a preferred embodiment, the preparation steps of the modified graphene are as follows:

[0009] Graphene and pure silicon powder are added as raw materials into absolute ethanol for ball milling for 24 to 36 hours to obtain a composite slurry; then the composite slurry is vacuum dried until absolute ethanol completely volatilizes to obtain modified graphene. Using pure silicon powder and graphene for ball milling and mixing can effectively adhere to the surface of graphene, play a role in avoiding easy agglomeration of graphene, and the graphene sheet structure is relatively complete without being severely ground.

[0010] As a preferred embodiment, the dosage ratio of graphene, pure silicon powder and absolute ethanol is 1.2 - 0.5 g: 1.2 - 0.5 g: 15 mL.

[0011] As a preferred embodiment, the sheet diameter of the graphene is 5 - 35 μm.

[0012] As a preferred embodiment, the particle size of the pure silicon powder is 60 - 80 nm. By reasonably controlling the sizes of graphene and pure silicon powder, the silicon particles can be well embedded into the graphene layer to form a "sandwich" structure, and then uniformly compounded modified graphene can be obtained.

[0013] As a preferred embodiment, the ball milling medium in the ball milling process is zirconia, the particle size of zirconia is 0.20 - 0.25 mm, and the ball-to-material ratio is 30:1.

[0014] The second aspect of the present invention provides a production process of a high-strength corrosion-resistant aluminum alloy material, including the following steps:

[0015] Step 1: Dry each raw material separately according to the weight percentages of the components of the aluminum alloy;

[0016] Step 2: Add the dried aluminum into a melting furnace for melting at a melting temperature of 740 - 750 °C, keep it standing and heat-insulated for 35 - 50 min, add the remaining raw materials, raise the temperature to 760 - 800 °C and continue the melting reaction, keep it standing and heat-insulated for 30 - 50 min to obtain an aluminum alloy melt;

[0017] Step 3: Add a refining agent into the aluminum alloy melt obtained in Step 2 for refining to remove slag and exhaust gas to obtain an aluminum alloy melt;

[0018] Step 4: Cast the aluminum alloy melt, and then obtain the aluminum alloy material after homogenization annealing process, hot extrusion process, solution heat treatment, aging treatment, and finishing.

[0019] As a preferred solution, in step 3, the refining agent is at least one of silicate and chloride. The silicate refining agent can form a protective film to prevent the corrosion of the aluminum alloy surface; the chloride refining agent can improve the separation between the molten aluminum and the slag, reduce the inclusion mixing, and thus improve the casting quality. Therefore, the use of the refining agent can significantly improve the refining effect and casting quality of the aluminum alloy.

[0020] As a preferred solution, the dosage of the refining agent in step 3 is 0.35 - 0.50% of the mass of the aluminum alloy melt obtained in step 2.

[0021] As a preferred solution, in step 4, the temperature in the homogenization annealing process is 460 - 520 °C, and the holding time is 2 - 3 h.

[0022] Advantages of the present invention:

[0023] 1. In the high-strength and corrosion-resistant aluminum alloy material provided by the present invention, through the selection of elements and the reasonable preparation of the dosages of each component, Zn element and Mg element, as the main strengthening elements of the aluminum alloy, can effectively increase the mechanical strength of the aluminum alloy material; the addition of Cu element can improve the corrosion resistance of the material, and the addition of Fe element can improve the elongation of the aluminum alloy material, so that the finally prepared aluminum alloy material has the advantages of high strength, high toughness, and corrosion resistance.

[0024] 2. The addition of modified graphene in the raw materials of the present invention can refine the grains of the matrix alloy, thereby improving the processing plasticity of the aluminum alloy material, and can also improve the strength and dent resistance of the aluminum alloy material, so that the aluminum alloy material obtains more excellent comprehensive mechanical properties. Compared with the traditional method of directly mixing graphene to improve the mechanical strength of the aluminum alloy material, due to the small volume and large surface area of graphene, agglomeration is likely to occur during the raw material mixing, resulting in insufficient interfacial bonding and thus unable to fully play a role in improving the mechanical strength of the aluminum alloy material. The modified graphene in the present invention is composed of graphene and pure silicon powder. On the one hand, the silicon particles are loaded between the graphene layers, which can effectively avoid the easy agglomeration of graphene, and then can be better mixed with the raw materials, effectively improving the mechanical properties of the aluminum alloy material; on the other hand, the silicon carbide formed by the modified graphene in the aluminum alloy preparation process can effectively improve the impact resistance and wear resistance of the aluminum alloy material.

[0025] 3. The production process of the high-strength and corrosion-resistant aluminum alloy material provided by the present invention is simple, easy to control, convenient for large-scale production, and has broad application prospects. Specific embodiments

[0026] Next, in combination with the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0027] Obviously, the following description is only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for those of ordinary skill in the art related to the content disclosed in the present application, some design, manufacturing or production changes based on the technical content disclosed in the present application are only conventional technical means and should not be understood as the content disclosed in the present application being insufficient.

[0028] However, there will be cases where unnecessary detailed descriptions are omitted. For example, there are cases where detailed descriptions of well-known matters are omitted and repeated descriptions of actually identical structures are omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate the understanding of those skilled in the art. In addition, the following description is provided for those skilled in the art to fully understand the present application and is not intended to limit the subject matter recited in the claims.

[0029] If there is no special description, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions. All technical features and optional technical features of the present application can be combined with each other to form new technical solutions.

[0030] Embodiment 1

[0031] This embodiment provides a high-strength corrosion-resistant aluminum alloy material and its production process:

[0032] A high-strength corrosion-resistant aluminum alloy material, including the following components by mass percentage: Zn 5.5%, Mg 2.0%, Cu 1.5%, Fe 0.15%, Si 0.068%, Cr 0.2%, Ti 0.03%, Mn 0.01%, Sr 0.04%, modified graphene 0.03%, impurities <0.1%, and the balance is Al.

[0033] The preparation steps of the modified graphene are as follows:

[0034] 1.2 g of graphene (flake diameter of 15 μm) and 1.8 g of pure silicon powder (particle size of 60 nm) were added as raw materials to 15 mL of absolute ethanol for ball milling. Among them, the ball milling medium was zirconia with a particle size of 0.20 mm, the ball-to-material ratio was 30:1, and the ball milling time was 28 h to obtain a composite slurry; then the composite slurry was placed in a vacuum oven at 60 °C and dried until the absolute ethanol completely volatilized to obtain modified graphene.

[0035] The production process of the above high-strength corrosion-resistant aluminum alloy material includes the following preparation steps:

[0036] Step 1: Dry each raw material according to the weight percentages of the components of the aluminum alloy.

[0037] Step 2: Add the dried aluminum to a melting furnace for melting. The melting temperature is 740 °C, hold for 45 min for static heat preservation, add the remaining raw materials, raise the temperature to 760 °C and continue the melting reaction, and hold for 35 min for static heat preservation to obtain an aluminum alloy melt.

[0038] Step 3: Add a refining agent to the aluminum alloy melt obtained in Step 2 for refining. The refining agent is potassium chloride, and the dosage of potassium chloride is 0.35% of the mass of the aluminum alloy melt. Remove slag and exhaust gas to obtain an aluminum alloy melt.

[0039] Step 4: Cast the aluminum alloy melt, and then undergo a homogenization annealing process, where the temperature in the homogenization annealing process is 460 °C, the holding time is 3 h, a hot extrusion process, a solution heat treatment, an aging treatment, and after finishing, an aluminum alloy material is obtained.

[0040] Example 2

[0041] This example provides a high-strength corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the difference is only in the preparation of modified graphene:

[0042] A high-strength corrosion-resistant aluminum alloy material includes the following components by mass percentage: Zn 5.5%, Mg 2.0%, Cu 1.5%, Fe 0.15%, Si 0.068%, Cr 0.2%, Ti 0.03%, Mn 0.01%, Sr 0.04%, modified graphene 0.03%, impurities < 0.1%, and the balance is Al.

[0043] The preparation steps of the modified graphene are as follows:

[0044] 1.4 g of graphene (flake diameter of 15 μm) and 1.6 g of pure silicon powder (particle size of 60 nm) were added as raw materials into 15 mL of absolute ethanol for ball milling. Among them, the ball milling medium was zirconia with a particle size of 0.20 mm, the ball-to-material ratio was 30:1, and the ball milling time was 28 h to obtain a composite slurry; then the composite slurry was placed in a vacuum oven at 60 °C and dried until the absolute ethanol completely evaporated to obtain modified graphene.

[0045] Example 3

[0046] This example provides a high-strength corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference is the preparation of modified graphene:

[0047] A high-strength corrosion-resistant aluminum alloy material includes the following components by mass percentage: Zn 5.5%, Mg 2.0%, Cu 1.5%, Fe 0.15%, Si 0.068%, Cr 0.2%, Ti 0.03%, Mn 0.01%, Sr 0.04%, modified graphene 0.03%, impurities < 0.1%, and the balance is Al.

[0048] The preparation steps of the modified graphene are as follows:

[0049] 1.5 g of graphene (flake diameter of 15 μm) and 1.5 g of pure silicon powder (particle size of 60 nm) were added as raw materials into 15 mL of absolute ethanol for ball milling. Among them, the ball milling medium was zirconia with a particle size of 0.20 mm, the ball-to-material ratio was 30:1, and the ball milling time was 28 h to obtain a composite slurry; then the composite slurry was placed in a vacuum oven at 60 °C and dried until the absolute ethanol completely evaporated to obtain modified graphene.

[0050] Example 4

[0051] This example provides a high-strength corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference is the amount of raw materials used in the aluminum alloy material:

[0052] A high-strength corrosion-resistant aluminum alloy material includes the following components by mass percentage: Zn 7.0%, Mg 2.5%, Cu 2.5%, Fe 0.3%, Si 0.08%, Cr 0.25%, Ti 0.05%, Mn 0.03%, Sr 0.06%, modified graphene 0.05%, impurities < 0.1%, and the balance is Al.

[0053] Example 5

[0054] This example provides a high-strength corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference is the amount of raw materials used in the aluminum alloy material:

[0055] A high-strength corrosion-resistant aluminum alloy material, comprising the following components in mass percentage: Zn 6.0%, Mg 2.0%, Cu 2.0%, Fe 0.18%, Si 0.07%, Cr 0.22%, Ti 0.035%, Mn 0.015%, Sr 0.05%, modified graphene 0.035%, impurities < 0.1%, and the balance is Al.

[0056] Example 6

[0057] This example provides a high-strength corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference is the different dosages of the raw materials of the aluminum alloy material:

[0058] A high-strength corrosion-resistant aluminum alloy material, comprising the following components in mass percentage: Zn 7.0%, Mg 2.3%, Cu 2.0%, Fe 0.15%, Si 0.065%, Cr 0.23%, Ti 0.04%, Mn 0.03%, Sr 0.045%, modified graphite 0.05%, impurities < 0.1%, and the balance is Al.

[0059] Example 7

[0060] This example provides a high-strength corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference is the different preparation steps of the aluminum alloy material:

[0061] A high-strength corrosion-resistant aluminum alloy material, comprising the following components in mass percentage: Zn 5.5%, Mg 2.0%, Cu 1.5%, Fe 0.15%, Si 0.068%, Cr 0.2%, Ti 0.03%, Mn 0.01%, Sr 0.04%, modified graphene 0.03%, impurities < 0.1%, and the balance is Al.

[0062] A production process of a high-strength corrosion-resistant aluminum alloy material, comprising the following preparation steps:

[0063] Step 1: Dry each raw material according to the weight percentage of each component of the aluminum alloy.

[0064] Step 2: Add the dried aluminum into a melting furnace for melting. The melting temperature is 750 °C, keep it static and heat-insulated for 35 min, add the remaining raw materials, raise the temperature to 800 °C and continue the melting reaction, keep it static and heat-insulated for 30 min to obtain an aluminum alloy melt.

[0065] Step 3: Add a refining agent into the aluminum alloy melt obtained in Step 2 for refining. The refining agent is potassium chloride, and the dosage of potassium chloride is 0.35% of the mass of the aluminum alloy melt. Remove slag and exhaust gas to obtain an aluminum alloy melt.

[0066] Step 4: Cast the aluminum alloy melt and then perform homogenization annealing. The temperature in the homogenization annealing process is 460°C, the holding time is 3 h, followed by hot extrusion process, solution heat treatment, aging treatment, and finishing to obtain the aluminum alloy material.

[0067] Example 8

[0068] This example provides a high-strength and corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference lies in the different preparation steps of the aluminum alloy material:

[0069] A high-strength and corrosion-resistant aluminum alloy material, including the following components by mass percentage: Zn 5.5%, Mg 2.0%, Cu 1.5%, Fe 0.15%, Si 0.068%, Cr 0.2%, Ti 0.03%, Mn 0.01%, Sr 0.04%, modified graphene 0.03%, impurities <0.1%, and the balance is Al.

[0070] A production process of a high-strength and corrosion-resistant aluminum alloy material, including the following preparation steps:

[0071] Step 1: Dry each raw material according to the weight percentage of each component of the aluminum alloy.

[0072] Step 2: Add the dried aluminum into a melting furnace for melting. The melting temperature is 740°C, hold for 45 min, add the remaining raw materials, raise the temperature to 760°C and continue the melting reaction, hold for 35 min to obtain the aluminum alloy melt.

[0073] Step 3: Add a refining agent into the aluminum alloy melt obtained in Step 2 for refining. The refining agent is potassium chloride, and the dosage of potassium chloride is 0.45% of the mass of the aluminum alloy melt. Remove slag and exhaust gas to obtain the aluminum alloy melt.

[0074] Step 4: Cast the aluminum alloy melt and then perform homogenization annealing. The temperature in the homogenization annealing process is 460°C, the holding time is 3 h, followed by hot extrusion process, solution heat treatment, aging treatment, and finishing to obtain the aluminum alloy material.

[0075] Example 9

[0076] This example provides a high-strength and corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference lies in the different preparation steps of the aluminum alloy material:

[0077] A high-strength and corrosion-resistant aluminum alloy material, comprising the following components by mass percentage: Zn 5.5%, Mg 2.0%, Cu 1.5%, Fe 0.15%, Si 0.068%, Cr 0.2%, Ti 0.03%, Mn 0.01%, Sr 0.04%, modified graphene 0.03%, impurities <0.1%, and the balance is Al.

[0078] A production process of a high-strength and corrosion-resistant aluminum alloy material, comprising the following preparation steps:

[0079] Step 1: Dry each raw material separately according to the weight percentage of each component of the aluminum alloy.

[0080] Step 2: Add the dried aluminum into a melting furnace for melting. The melting temperature is 740 °C, hold for 45 min for static heat preservation, add the remaining raw materials, raise the temperature to 760 °C and continue the melting reaction, hold for 35 min for static heat preservation to obtain an aluminum alloy melt.

[0081] Step 3: Add a refining agent into the aluminum alloy melt obtained in Step 2 for refining. The refining agent is potassium chloride, and the dosage of potassium chloride is 0.35% of the mass of the aluminum alloy melt. Remove slag and exhaust gas to obtain an aluminum alloy melt.

[0082] Step 4: Cast the aluminum alloy melt, and then perform a homogenization annealing process. The temperature in the homogenization annealing process is 520 °C, the heat preservation time is 2 h, a hot extrusion process, a solution heat treatment, an aging treatment, and finish machining to obtain the aluminum alloy material.

[0083] Comparative Example 1

[0084] This comparative example provides a high-strength and corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the difference is only that modified graphene is not added to the aluminum alloy raw materials:

[0085] A high-strength and corrosion-resistant aluminum alloy material, comprising the following components by mass percentage: Zn 5.5%, Mg 2.0%, Cu 1.5%, Fe 0.15%, Si 0.068%, Cr 0.2%, Ti 0.03%, Mn 0.01%, Sr 0.04%, impurities <0.1%, and the balance is Al.

[0086] Comparative Example 2

[0087] This comparative example provides a high-strength and corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the difference is only that only graphene is added to the aluminum alloy raw materials:

[0088] A high-strength and corrosion-resistant aluminum alloy material, comprising the following components by mass percentage: Zn 5.5%, Mg 2.0%, Cu 1.5%, Fe 0.15%, Si 0.068%, Cr 0.2%, Ti 0.03%, Mn 0.01%, Sr 0.04%, graphene 0.03%, impurities < 0.1%, and the balance is Al.

[0089] Comparative Example 3

[0090] This comparative example provides a high-strength and corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference is the different amounts of raw materials used in the aluminum alloy material:

[0091] A high-strength and corrosion-resistant aluminum alloy material, comprising the following components by mass percentage: Zn 4.5%, Mg 2.0%, Cu 1.5%, Fe 0.15%, Si 0.068%, Cr 0.2%, Ti 0.03%, Mn 0.01%, Sr 0.04%, modified graphene 0.03%, impurities < 0.1%, and the balance is Al.

[0092] Comparative Example 4

[0093] This comparative example provides a high-strength and corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference is the different amounts of raw materials used in the aluminum alloy material:

[0094] A high-strength and corrosion-resistant aluminum alloy material, comprising the following components by mass percentage: including the following components by mass percentage: Zn 5.5%, Mg 1.5%, Cu 1.0%, Fe 0.15%, Si 0.068%, Cr 0.2%, Ti 0.03%, Mn 0.01%, Sr 0.04%, modified graphene 0.03%, impurities < 0.1%, and the balance is Al.

[0095] Comparative Example 5

[0096] This comparative example provides a high-strength and corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference is the different preparation steps of the aluminum alloy material:

[0097] A production process of a high-strength and corrosion-resistant aluminum alloy material, comprising the following preparation steps:

[0098] Step 1: Dry each raw material separately according to the weight percentage of each component of the aluminum alloy.

[0099] Step 2: Add the dried aluminum into a melting furnace for melting. The melting temperature is 700 °C, keep it static and heat-insulated for 45 min, add the remaining raw materials, raise the temperature to 720 °C and continue the melting reaction, keep it static and heat-insulated for 35 min to obtain an aluminum alloy melt.

[0100] Step 3: Add a refining agent into the aluminum alloy melt obtained in Step 2 for refining. The refining agent is potassium chloride, and the dosage of potassium chloride is 0.35% of the mass of the aluminum alloy melt. Remove slag and exhaust gas to obtain an aluminum alloy melt.

[0101] Step 4: Cast the aluminum alloy melt, and then perform a homogenization annealing process. The temperature in the homogenization annealing process is 460 °C, and the holding time is 3 h. Then perform a hot extrusion process, solution heat treatment, aging treatment, and finish machining to obtain an aluminum alloy material.

[0102] Comparative Example 6

[0103] This comparative example provides a high-strength and corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference is the different preparation steps of the aluminum alloy material:

[0104] A production process of a high-strength and corrosion-resistant aluminum alloy material includes the following preparation steps:

[0105] Step 1: Dry each raw material separately according to the weight percentages of the components of the aluminum alloy.

[0106] Step 2: Add the dried aluminum into a melting furnace for melting. The melting temperature is 740 °C, hold for 45 min, add the remaining raw materials, raise the temperature to 760 °C and continue the melting reaction, hold for 35 min to obtain an aluminum alloy melt.

[0107] Step 3: Add a refining agent into the aluminum alloy melt obtained in Step 2 for refining. The refining agent is potassium chloride, and the dosage of potassium chloride is 0.25% of the mass of the aluminum alloy melt. Remove slag and exhaust gas to obtain an aluminum alloy melt.

[0108] Step 4: Cast the aluminum alloy melt, and then perform a homogenization annealing process. The temperature in the homogenization annealing process is 460 °C, and the holding time is 3 h. Then perform a hot extrusion process, solution heat treatment, aging treatment, and finish machining to obtain an aluminum alloy material.

[0109] Comparative Example 7

[0110] This comparative example provides a high-strength and corrosion-resistant aluminum alloy material and its production process. Compared with Example 1, the only difference is the different preparation steps of the aluminum alloy material:

[0111] A production process of a high-strength and corrosion-resistant aluminum alloy material includes the following preparation steps:

[0112] Step 1: Dry each raw material separately according to the weight percentages of the components of the aluminum alloy.

[0113] Step 2: Add the dried aluminum into a melting furnace for melting. The melting temperature is 740°C, keep it static and insulated for 45 minutes, add the remaining raw materials, raise the temperature to 760°C and continue the melting reaction, then keep it static and insulated for 35 minutes to obtain an aluminum alloy melt;

[0114] Step 3: Add a refining agent into the aluminum alloy melt obtained in Step 2 for refining. The refining agent is potassium chloride, and the dosage of potassium chloride is 0.35% of the mass of the aluminum alloy melt. Remove slag and exhaust gas to obtain an aluminum alloy melt;

[0115] Step 4: Cast the aluminum alloy melt, and then undergo a homogenization annealing process. The temperature in the homogenization annealing process is 400°C, and the holding time is 3 hours. Then, perform a hot extrusion process, solution heat treatment, aging treatment, and finish machining to obtain an aluminum alloy material.

[0116] Perform the following performance tests on the aluminum alloy materials prepared in Examples 1 to 9 and Comparative Examples 1 to 7: (1) Mechanical property test: Conduct mechanical property tests on them according to GB / T 228.1-2010; (2) Corrosion resistance test: Conduct a salt spray corrosion test according to the standard of GB / T 10125-1997, and measure the corrosion amount of the aluminum alloy material after 96 hours. The test results are shown in Table 1:

[0117] Table 1

[0118]

[0119]

[0120] As can be seen from Table 1, the aluminum alloy materials prepared in Examples 1-9 have more excellent yield strength, tensile strength, hardness and corrosion resistance compared with the aluminum alloy materials prepared in Comparative Examples 1-7. Thus, it can be seen that the high-strength and corrosion-resistant aluminum alloy material and its production process provided in the present invention result in aluminum alloy materials with the advantages of high strength, high toughness, corrosion resistance, etc. At the same time, the production process is simple, easy to control, convenient for large-scale production, and has broad application prospects.

[0121] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0122] It should be understood that in various embodiments of the present application, the magnitudes of the sequence numbers of the various processes do not imply the order of execution. Some or all of the steps may be executed in parallel or sequentially, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application regulations.

[0123] Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment, etc. used in the present application can be obtained through market purchases or can be prepared by existing methods.

[0124] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-strength corrosion-resistant aluminum alloy material, characterized in that: The invention comprises the following components in mass percentage: 5.5-7.0% Zn, 2.0-2.5% Mg, 1.5-2.5% Cu, 0.15-0.3% Fe, 0.06-0.08% Si, 0.20-0.25% Cr, 0.03-0.05% Ti, 0.01-0.03% Mn, 0.04-0.06% Sr, 0.03-0.05% modified graphene, impurities less than 0.1%, and the balance is Al.

2. The high-strength corrosion-resistant aluminum alloy material according to claim 1, characterized in that: The preparation steps of modified graphene are as follows: Graphene and pure silicon powder are added as raw materials into anhydrous ethanol for ball milling for 24 to 36 hours to obtain a composite slurry; the composite slurry is then vacuum dried until the anhydrous ethanol is completely volatilized to obtain modified graphene.

3. The high-strength corrosion-resistant aluminum alloy material according to claim 1, characterized in that: The usage ratio of graphene, pure silicon powder and anhydrous ethanol is 1.2-0.5g:1.2-0.5g:15mL.

4. The high-strength corrosion-resistant aluminum alloy material according to claim 1, characterized in that: The sheet diameter of the graphene is 5 to 35 μm.

5. The high-strength corrosion-resistant aluminum alloy material according to claim 1, characterized in that: The particle size of the pure silicon powder is 60-80 nm.

6. The high-strength corrosion-resistant aluminum alloy material according to claim 1, characterized in that: The ball milling medium in the ball milling process is zirconium oxide, the particle size of the zirconium oxide is 0.20-0.25 mm, and the ball-to-material ratio is 30:

1.

7. A production process for a high-strength, corrosion-resistant aluminum alloy material according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1, drying the raw materials separately according to the weight percentage of each component of the aluminum alloy; Step 2, adding the dried aluminum into a smelting furnace for melting at a melting temperature of 740-750°C, standing and keeping the temperature for 35-50 minutes, adding the remaining raw materials, raising the temperature to 760-800°C to continue the melting reaction, standing and keeping the temperature for 30-50 minutes, and obtaining an aluminum alloy melt; Step 3, adding a refining agent to the aluminum alloy melt obtained in step 2 for refining, removing slag and exhausting gas to obtain an aluminum alloy melt; Step 4: Casting the aluminum alloy melt, and then obtaining the aluminum alloy material after homogenization annealing process, hot extrusion process, solution heat treatment, aging treatment, and finishing.

8. The production process of a high-strength corrosion-resistant aluminum alloy material according to claim 7, characterized in that: The refining agent in step 3 is at least one of a silicate and a chloride salt.

9. The production process of a high-strength corrosion-resistant aluminum alloy material according to claim 7, characterized in that: The amount of the refining agent used in step 3 is 0.35-0.50% of the mass of the aluminum alloy melt obtained in step 2.

10. The production process of a high-strength corrosion-resistant aluminum alloy material according to claim 7, characterized in that: The temperature in the homogenization annealing process in step 4 is 460-520° C., and the holding time is 2-3 hours.

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