Anodized aluminum manganese oxide alloy for die-casting brazing and preparation method of anodized aluminum manganese oxide alloy

Abstract

The invention discloses anodisable aluminum manganese oxide alloy for die-casting brazing and a preparation method thereof, belongs to the technical field of aluminum alloy materials, and solves the problems that a traditional brazing material cannot be machined due to insufficient hardness after brazing, can only be machined firstly and then is brazed, but product deformation and dimensional deviation are caused by high brazing temperature, and the machining cost is low. And the product precision and the yield are low. The anodisable aluminum manganese oxide alloy for die-casting and brazing comprises the following components: 2.3-2.7% of Mn; 0.1% to 0.3% of Cu; 0.5% to 0.7% of Fe; 0.5% to 0.8% of Ti; the total amount of the impurities is less than or equal to 0.5%. Compared with a traditional alloy material with the strength performance, the alloy has the higher solidus temperature, can meet the brazing requirement and is more excellent in ductility performance. And after brazing is completed, certain strength and hardness are still achieved, the phenomenon that a common brazing material cannot be machined after brazing can be avoided, and the production cost and the equipment investment are effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy materials technology, specifically to an anodizable aluminum-manganese alloy for die casting brazing and its preparation method. Background Technology

[0002] The rapid development of the 3C industry has led to a continuous increase in market demand for aluminum alloy materials, with higher requirements placed on their appearance quality (such as surface color and uniformity) and corrosion resistance. Currently, aluminum alloy structural components (such as mobile phone casings and laptop panels) and decorative parts in the 3C field are mainly produced using traditional long-process technology: semi-continuous casting → ingot homogenization → extrusion / rolling → machining → anodizing. This process is time-consuming and costly, becoming a key factor restricting the further application of aluminum alloy materials in the 3C field. To solve these problems, pressure casting, with its advantages of high production efficiency, strong near-net-shape forming capability, high yield, and low cost, has been widely used in the mass industrial production of complex thin-walled precision aluminum alloy castings for 3C applications. However, to meet diverse appearance and surface quality requirements, die-cast products usually require anodizing, and the anodizing effect is affected by multiple factors such as alloy composition, grain size, type / morphology / size of the second phase, and the anodizing process.

[0003] The most widely used die-cast aluminum alloys are aluminum-silicon cast aluminum alloys (such as ADC12), which typically have a silicon content greater than 9% to ensure good casting performance and an iron content greater than 7% to improve demolding performance. However, these alloys have significant defects: silicon is difficult to anodize, and impurities in silicon can cause the oxide film surface to turn gray, produce black spots or black lines, seriously affecting the appearance quality; excessively high silicon content (more than 7%) can easily lead to porosity and cracks during welding, reducing post-weld strength; although copper can improve the alloy's strength and thermal stability, it can make the oxide film red and increase defects; and iron can cause black spots to appear on the surface after anodizing.

[0004] Furthermore, traditional brazing materials suffer from insufficient hardness after brazing, leading to tool sticking during machining. Therefore, all machining processes must be completed before brazing. However, excessively high temperatures during brazing can cause product deformation, resulting in dimensional deviations and making it difficult to guarantee precision requirements, ultimately affecting product yield. Currently, materials modified for anodizing performance often incorporate elements such as Zn and Mg (making them more like 7-series aluminum alloys) to improve mechanical properties. However, this often results in Zn and Mg content exceeding the requirements for brazing materials, thus losing brazing performance and failing to meet the brazing process requirements of 3C products. Summary of the Invention

[0005] To address the shortcomings and deficiencies of existing technologies, this invention provides an anodizable aluminum-manganese alloy for die casting brazing, which combines excellent die casting performance, good anodizing effect, and reliable brazing performance, and whose alloy still has sufficient hardness after brazing to meet subsequent machining requirements, without the need to add Zn and Mg elements to adapt to the brazing process, and its preparation method.

[0006] To achieve the above objectives, the present invention provides an anodizable aluminum-manganese alloy for die casting brazing, wherein the aluminum-manganese alloy composition, calculated by mass fraction, includes the following components: Mn: 2.3%-2.7%; Cu: 0.1%-0.3%; Fe: 0.5%-0.7%; Ti: 0.5%-0.8%; the remainder being Al and unavoidable impurities, and the total amount of impurities is less than or equal to 0.5%.

[0007] Preferably, in the aluminum-manganese alloy, the Cu source is industrial pure Cu with a purity greater than or equal to 99.9%; the Mn source is an Al-Mn master alloy; the Fe source is an Al-Fe master alloy; and the Ti source is an Al-Ti-B master alloy.

[0008] A method for preparing anodizable aluminum-manganese alloy for die casting brazing includes the following steps:

[0009] S1. Alloy melting: Industrial pure aluminum, Al-Mn master alloy, Al-Fe master alloy, industrial pure Cu and Al-Ti-B master alloy are mixed according to the set mass fraction ratio and heated and melted in a crucible resistance furnace at a melting temperature of 770℃-810℃.

[0010] S2. Refining and Degassing: Sampling and testing. After the alloy melt composition in step S1 is qualified, high-purity argon gas is introduced for degassing. The treated melt is then slag-removed and allowed to stand.

[0011] S3. Casting and die-casting process operation.

[0012] Preferably, in step S1, the Al-Mn master alloy is specifically an Al-10Mn master alloy, and the Al-Fe master alloy body is specifically an Al-20Fe master alloy.

[0013] Preferably, the Al content in industrial pure Al is greater than or equal to 99.75%.

[0014] Preferably, in step S2, the high-purity argon gas degassing operation specifically employs a single-rotor degassing machine to introduce high-purity argon gas for degassing for at least 15 minutes.

[0015] Preferably, in step S3, the casting process specifically includes: performing a casting operation on the melt after refining and degassing in step S2 to obtain an alloy ingot of a specified size;

[0016] The die casting specifically includes: remelting the alloy ingot and performing a die casting process to obtain a die-cast aluminum-manganese alloy.

[0017] Preferably, the specific parameters for the die-casting process include the following:

[0018] The die casting temperature is 650℃-750℃, and the mold temperature is 200℃-280℃; the injection filling speed is 10-50m / s, and the injection specific pressure range is less than or equal to 2×10. 5 kPa.

[0019] Preferably, the solidus temperature of the die-cast aluminum-manganese alloy is greater than or equal to 640°C, ensuring that the alloy matrix does not melt or soften excessively during brazing, thus meeting the requirements of the brazing process for the thermal stability of the base material.

[0020] An application of an anodizable aluminum-manganese alloy for die casting brazing is disclosed. The die-cast aluminum-manganese alloy prepared by the above method is directly used in the brazing process, and the Brinell hardness after brazing is greater than or equal to 40HV, ensuring that the alloy meets the machining requirements after brazing.

[0021] This invention provides an anodizable aluminum-manganese alloy for die casting brazing and its preparation method. It has the following beneficial effects:

[0022] (1) The anodizable aluminum-manganese alloy for die casting brazing of the present invention exhibits good pressure processing performance through the synergistic effect of components such as 2.3%-2.7% Mn element, 0.1%-0.3% Cu element, 0.5%-0.7% Fe element, and 0.5%-0.8% Ti element with the Al element matrix. It can be used to manufacture parts that require welding or further processing, and the manufacturing process is more flexible.

[0023] Compared with traditional alloys of the same strength grade, the aluminum-manganese alloy of the present invention has a higher solidus temperature, which can meet the requirements of the brazing process for the thermal stability of the base material, avoid the melting or excessive softening of the alloy matrix during the brazing process, and at the same time has excellent mechanical ductility, which can enhance its applicability in complex forming scenarios.

[0024] Furthermore, the aluminum-manganese alloy of the present invention can achieve good mechanical properties and anodizing effect without heat treatment, and can be directly used in brazing process. In particular, it can maintain sufficient strength and hardness after brazing, effectively solving the problem that ordinary brazing materials are difficult to machine after brazing.

[0025] (2) In the preparation process of the aluminum-manganese alloy of the present invention, there is no need to use expensive and scarce rare earth alloys to optimize the grain size and improve the performance. The alloy performance can be optimized by scientifically proportioning the basic alloy components and coordinating the control of process parameters. Thus, while ensuring that the product performance meets the requirements, the cost of raw materials is effectively reduced, and the alloy has a better cost-performance advantage in the manufacturing process. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] The present invention relates to an anodizable aluminum-manganese alloy for die casting brazing, wherein the aluminum-manganese alloy composition, calculated by mass percentage, includes the following components: Mn: 2.3%-2.7%; Cu: 0.1%-0.3%; Fe: 0.5%-0.7%; Ti: 0.5%-0.8%; the remainder being Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.5%.

[0028] Mn, as the core strengthening element in the alloy of this invention, can form the MnAl6 phase with Al. The MnAl6 phase, as dispersed particles, hinders grain growth during recrystallization, thereby refining the grains and improving the strength and hardness of the alloy. At the same time, Mn can preferentially combine with Fe to form the (Fe, Mn)Al6 phase, reducing the probability of Fe reacting directly with the Al matrix to form the harmful Al-Fe phase, thus reducing the adverse effects of iron on the alloy properties. In addition, Mn can also react with trace amounts of magnesium in the alloy to form the Al-Mn-Mg phase, consuming the activation effect of magnesium on the oxide film, reducing the tendency for hot cracking, and indirectly improving the weldability and casting stability of the alloy.

[0029] Cu is used to improve the strength and thermal stability of alloy materials and enhance the mechanical properties of the alloy matrix through solid solution strengthening mechanism. At the same time, an appropriate amount of Cu can improve the die casting fluidity of the alloy to a certain extent, but its content must be strictly controlled between 0.1% and 0.3% to avoid red defects in the anodic oxide film or increased discontinuity of the oxide film due to excessive amount.

[0030] An appropriate amount of Fe can improve the die casting release performance of alloy materials, reduce the adhesion between castings and molds, and improve die casting production efficiency. At the same time, under the synergistic effect of Fe and Mn, iron will form the (Fe, Mn)Al6 phase, avoiding the existence of the Al-Fe phase alone, thereby reducing its negative impact on anodizing performance.

[0031] Ti, as a grain refiner, can promote nucleation during alloy solidification, significantly refine as-cast grains, improve the uniformity of the alloy's casting structure, and thus enhance the alloy's mechanical and processing properties. In addition, titanium can also improve the alloy's high-temperature stability and, in synergy with other elements, enhance the alloy's resistance to softening during brazing, ensuring the mechanical properties after brazing.

[0032] This invention utilizes a synergistic effect between the Al matrix and components of 2.3%-2.7% Mn, 0.1%-0.3% Cu, 0.5%-0.7% Fe, and 0.5%-0.8% Ti (by mass) to produce an aluminum-manganese alloy material that exhibits excellent pressure processing performance. The solidus temperature of the aluminum-manganese alloy is greater than or equal to 640℃, ensuring that the alloy matrix does not melt or excessively soften during brazing, thus meeting the thermal stability requirements of the brazing process. Furthermore, the prepared aluminum-manganese alloy material can be directly used in brazing processes, and after brazing, its Brinell hardness is greater than or equal to 40 HV, ensuring that the alloy meets machinability requirements after brazing.

[0033] Example 1

[0034] In this embodiment, the total mass of the anodizable aluminum-manganese alloy prepared for die casting brazing is 100 kg, wherein the weight percentage of each component is as follows: Mn: 2.53%; Fe: 0.61%; Ti: 0.63%; Cu: 0.22%; the remainder is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.5%.

[0035] Its preparation method includes the following steps:

[0036] S1. Alloy melting: A resistance melting furnace is used as the melting equipment. Each component is added in sequence according to the set mass fraction ratio. The components are 99.75% pure industrial Al, industrial pure Cu, Al-10Mn master alloy, Al-20Fe master alloy and Al-Ti-B master alloy. The alloy is heated and melted in a crucible resistance furnace at a melting temperature of 770℃-810℃.

[0037] S2. Refining and Degassing: Sampling and testing. After the alloy melt composition in step S1 is qualified, a sample is taken. After the alloy composition is qualified, high-purity argon gas is introduced into the single rotor degasser for more than 15 minutes. The treated melt is then allowed to stand after slag removal.

[0038] S3. Casting or die casting: Cast the melt after refining and degassing in step S2 into 10 metal ingots, each weighing 10 kg and measuring 70 mm thick, 900 mm long, and 200 mm wide.

[0039] Example 2

[0040] In this embodiment, the weight percentages of each component in the anodizable aluminum-manganese alloy used for die casting brazing are as follows: Mn: 2.55%; Fe: 0.62%; Ti: 0.61%; Cu: 0.21%; the remainder is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.5%.

[0041] The preparation and casting process of the anodizable aluminum-manganese alloy for die casting brazing in this embodiment are the same as those in Example 1.

[0042] Example 3

[0043] In this embodiment, the weight percentages of the components in the anodizable aluminum-manganese alloy used for die casting brazing are as follows: Mn: 2.52%; Fe: 0.61%; Ti: 0.65%; Cu: 0.24%; the remainder is Al and unavoidable impurities, wherein the total amount of impurities is less than or equal to 0.5%.

[0044] The preparation process and casting process of the anodizable aluminum-manganese alloy for die casting brazing in this embodiment are the same as those in Embodiment 1.

[0045] Comparative Example 1

[0046] The weight percentages of the components in the anodizable aluminum-manganese alloy used for die casting brazing in this comparative example are as follows: Mn: 1.22%; Fe: 0.23%; Cu: 0.11%; the remainder is Al and unavoidable impurities, of which the total amount of impurities is less than or equal to 0.5%.

[0047] The preparation method includes the following steps:

[0048] S1. Alloy melting: A resistance melting furnace is used as the melting equipment. Each component is added in sequence according to the set mass fraction ratio. Industrial pure Al, industrial pure Cu, Al-10Mn master alloy and Al-20Fe master alloy with a purity of 99.75% are heated and melted in a crucible resistance furnace. The melting temperature is 770-810℃.

[0049] S2. Refining and Degassing: Sampling and testing. After the alloy melt composition in step S1 is qualified, a sample is taken. After the alloy composition is qualified, high-purity argon gas is introduced into the single rotor degasser for more than 15 minutes. The treated melt is then allowed to stand after slag removal.

[0050] S3. Casting or die casting: The melt after refining and degassing in step S2 is cast into a metal ingot.

[0051] Comparative Example 2

[0052] The weight percentages of the components in the anodizable aluminum-manganese alloy used for die casting brazing in this comparative example are as follows: Mn: 1.24%; Fe: 0.22%; Cu: 0.14%; the remainder being Al and unavoidable impurities, of which the total amount of impurities is less than or equal to 0.5%.

[0053] The preparation method includes the following steps:

[0054] S1. Alloy melting: A resistance melting furnace is used as the melting equipment. Each component is added in sequence according to the set mass fraction ratio. Industrial pure Al, industrial pure Cu, Al-10Mn master alloy and Al-20Fe master alloy with a purity of 99.75% are heated and melted in a crucible resistance furnace. The melting temperature is 770-810℃.

[0055] S2. Refining and Degassing: Sampling and testing. After the alloy melt composition in step S1 is qualified, a sample is taken. After the alloy composition is qualified, high-purity argon gas is introduced into the single rotor degasser for more than 15 minutes. The treated melt is then allowed to stand after slag removal.

[0056] S3. Casting or die casting: The melt after refining and degassing in step S2 is cast into a metal ingot.

[0057] Test case

[0058] The alloy ingots prepared in Examples 1, 2, 3, Comparative Example 1, and Comparative Example 2 were remelted and die-cast using the same standard die-casting process to prepare tensile test samples and flat plate samples suitable for anodizing tests.

[0059] In the die casting process, the die casting temperature is 650℃-750℃, and the mold temperature is 200℃-280℃; the injection filling speed is 10-50m / s, and the injection specific pressure range is less than or equal to 2×10⁻⁶ m / s. 5 kPa. The injection speed is adjusted according to the shape and size of the casting to ensure full filling and avoid the generation of porosity and inclusions; the injection pressure is determined according to the shape and size of the casting to ensure full filling and avoid internal defects; the cooling time is determined according to the thickness and material of the casting to ensure that the ideal hardness and strength are achieved.

[0060] The tensile test sample of Comparative Example 1 was fully annealed and slowly cooled, i.e., the tensile sheet was in the O state; the tensile test sample of Comparative Example 2 was fully annealed and slowly cooled, i.e., the tensile sheet was in the O state, and then cold rolled with a reduction of about 75%, and no further heat treatment was performed, i.e., the tensile sheet was in the H18 state.

[0061] distinguish Yield strength tensile strength elongation Die-cast hardness Hardness after fiber welding Example 1 112.8 182.12 11.4 69.4HV 53.3HV Example 2 111.6 179.68 11.57 67.6HV 53.5HV Example 3 112.4 182.76 10.88 68.8HV 54.1HV Comparative Example 1 50 110 25 35.3HV 29.5HV Comparative Example 2 160 180 2 60.2HV 30.3HV

[0062] The tensile specimens prepared in Examples 1-3 and Comparative Examples 1-2 were subjected to mechanical property tests using an electronic universal testing machine and a digital microhardness tester. The specific test results are as follows:

[0063] The anodizable aluminum-manganese alloys for die casting brazing prepared in Examples 1-3 of this invention have excellent casting performance and high mechanical strength through the synergistic effect of various elements on the microstructure. They can be prepared under non-heat treatment conditions, achieving a high strength and high toughness that balances strength and plasticity.

[0064] The aluminum alloy preparation process and die-casting process in Comparative Examples 1 and 2 are the same as those in Example 1. The difference is that the amount of each component added in Comparative Examples 1-2 is reduced by about 1.3%, the content of Fe is reduced by about 0.24%, the content of Cu is reduced by about 0.1%, and Ti is not added.

[0065] Compared to the aluminum-manganese alloy prepared in Example 1, the silicon alloys prepared in Comparative Examples 1 and 2 by controlling the content of the above components exhibit the following mechanical properties: Comparative Example 1 shows low strength and high elongation (yield strength 50 MPa, tensile strength 110 MPa, elongation 25%). Although it has excellent plasticity, its strength cannot meet the structural load-bearing capacity requirements of 3C products. In this embodiment of the invention, by optimizing the proportions of each element, the yield strength is increased to 110 MPa-113 MPa and the tensile strength is increased to 178-183 MPa while still meeting the actual usage requirements. This represents a breakthrough improvement in strength and solves the problem of insufficient strength in Comparative Example 1.

[0066] The aluminum alloy obtained in Comparative Example 2 with the above element ratio has high strength (yield strength 160 MPa, tensile strength 180 MPa), but its elongation is only 2%, and its plasticity is extremely poor, making it prone to brittle fracture during processing and unable to meet the requirements of subsequent machining and forming. The embodiment of the present invention, while maintaining a tensile strength close to that of Comparative Example 2, significantly increases the elongation to 10%-12%, while both yield strength and tensile strength meet practical application requirements, achieving a balance between strength and plasticity and overcoming the defect of poor plasticity in Comparative Example 2.

[0067] Furthermore, the aluminum-manganese alloys of Examples 1-3 in this invention also exhibit significant advantages in hardness performance compared to Comparative Examples 1-2. In terms of die-cast hardness, the hardness values ​​of Examples 1-3 are 67HV-70HV, far exceeding the hardness values ​​of the alloy materials in Comparative Examples 1-2. This indicates that the alloys of this invention possess high initial hardness after die casting, meeting the basic requirements for material hardness in conventional applications. More importantly, the hardness performance after brazing is significant: the hardness of Examples 1-3 after brazing is 53HV-55HV, while the hardness of Comparative Example 1 after brazing is only 29.5HV, and that of Comparative Example 2 is only 30.3HV. The hardness of the examples after brazing is approximately 1.8 times that of the comparative examples. This difference fully demonstrates that the aluminum-manganese alloys of this invention experience minimal hardness loss after brazing, maintaining sufficient strength and hardness, effectively solving the problem of significant hardness reduction and machinability difficulties after brazing of ordinary brazing materials (such as Comparative Examples 1-2). Meanwhile, the aluminum-manganese alloys in Examples 1-3 exhibit both high initial hardness and stable hardness after brazing. Combined with their ability to achieve good mechanical properties without heat treatment, this not only simplifies the production process but also effectively improves the material's applicability in complex forming and post-brazing processing.

[0068] The above comparison clearly shows that the present invention uses Mn to form a strengthening phase, Fe to improve die-casting performance, Ti to refine grains, and Cu to strengthen through solid solution. The above elemental components work synergistically with Al to achieve the desired effect. While ensuring an elongation of more than 10% and meeting the processing plasticity requirements, the yield strength and tensile strength of the alloy material are significantly improved compared with the soft alloy in Comparative Example 1. This solves the dilemma of low strength or poor plasticity in traditional aluminum-manganese alloys and is suitable for the comprehensive requirements of 3C products for high strength and easy processing.

[0069] The aluminum-manganese alloy of the present invention was subjected to anodizing test: a flat sample was processed using an anodizing device, the test current was set to 1.0A and the voltage to 12V, and anodizing was carried out continuously at 25℃ for 30min. The results showed that the sample surface was in excellent condition, with no defects such as graying or black spots, and the average thickness of the oxide film formed could reach 20μm, which fully verified that the alloy has good anodizing performance and can meet the requirements of 3C products for surface quality and film thickness.

[0070] In summary, this invention, through optimized alloy composition design, endows the material with excellent die-casting fluidity and demolding properties, precisely meeting the die-casting requirements of complex thin-walled parts and providing a reliable material foundation for precision component manufacturing. Simultaneously, this alloy possesses a high solidus temperature and sufficient hardness after brazing, ensuring the matrix remains stable and does not melt or excessively soften during brazing, while maintaining sufficient strength after brazing. This enables post-weld machining, overcoming the technological bottleneck of traditional materials being unprocessable after brazing or exhibiting brazing deformation after processing. It provides crucial support for the coordinated implementation of welding and machining processes.

[0071] Based on the above embodiments, the present invention continues to describe in detail the technical features involved therein and the functions and roles of these technical features in the present invention, so as to help those skilled in the art to fully understand the technical solution of the present invention and reproduce it.

[0072] Finally, although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An anodizable aluminum-manganese alloy for die casting brazing, characterized in that, The aluminum-manganese alloy composition, calculated by mass fraction, includes the following components: Mn: 2.3%-2.7%; Cu: 0.1%-0.3%; Fe: 0.5%-0.7%; Ti: 0.5%-0.8%; the remainder is Al and unavoidable impurities, with the total amount of impurities less than or equal to 0.5%.

2. The anodizable aluminum-manganese alloy for die casting brazing according to claim 1, characterized in that, In the aluminum-manganese alloy, the Cu source is industrial pure Cu with a purity greater than or equal to 99.9%; the Mn source is an Al-Mn master alloy; the Fe source is an Al-Fe master alloy; and the Ti source is an Al-Ti-B master alloy.

3. A method for preparing anodizable aluminum-manganese alloy for die casting brazing according to any one of claims 1-2, characterized in that, Includes the following steps: S1. Alloy melting: Industrial pure aluminum, Al-Mn master alloy, Al-Fe master alloy, industrial pure Cu and Al-Ti-B master alloy are mixed according to the set mass fraction ratio and heated and melted in a crucible resistance furnace at a melting temperature of 770℃-810℃. S2. Refining and Degassing: Sampling and testing. After the alloy melt composition in step S1 is qualified, high-purity argon gas is introduced for degassing. The treated melt is then slag-removed and allowed to stand. S3. Casting and die-casting process operation.

4. The method for preparing anodizable aluminum-manganese alloy for die casting brazing according to claim 3, characterized in that, In step S1, the Al-Mn master alloy is specifically an Al-10Mn master alloy, and the Al-Fe master alloy body is specifically an Al-20Fe master alloy.

5. An anodizable aluminum-manganese alloy for die casting brazing according to claim 3, characterized in that, The industrial pure Al contains an Al content of 99.75% or greater.

6. The method for preparing anodizable aluminum-manganese alloy for die casting brazing according to claim 3, characterized in that, In step S2, the high-purity argon gas degassing operation is specifically carried out by using a single-rotor degassing machine to introduce high-purity argon gas for at least 15 minutes.

7. The method for preparing anodizable aluminum-manganese alloy for die casting brazing according to claim 3, characterized in that, In step S3, the casting process specifically includes: casting the melt after refining and degassing in step S2 to obtain an alloy ingot of a specified size; The die-casting process specifically includes: remelting the alloy ingot and performing a die-casting operation to obtain a die-cast aluminum-manganese alloy.

8. The method for preparing anodizable aluminum-manganese alloy for die casting brazing according to claim 7, characterized in that, The specific parameters for the die-casting process include the following: The die casting temperature is 650℃-750℃, and the mold temperature is 200℃-280℃; the injection filling speed is 10-50m / s, and the injection specific pressure range is less than or equal to 2×10. 5 kPa.

9. A method for preparing anodizable aluminum-manganese alloy for die casting brazing according to claim 7, characterized in that, The solidus temperature of the die-cast aluminum-manganese alloy is greater than or equal to 640°C, ensuring that the alloy matrix does not melt or soften excessively during brazing, thus meeting the requirements of the brazing process for the thermal stability of the base material.

10. An application of an anodizable aluminum-manganese alloy for die casting brazing, characterized in that, An anodizable aluminum-manganese alloy for die casting brazing is prepared by the method described in any one of claims 3-9. The die-cast aluminum-manganese alloy is directly used in the brazing process, and the Brinell hardness after brazing is greater than or equal to 40HV, ensuring that the alloy meets the machining requirements after brazing.