Aluminum-manganese alloy plate, sheet material, liquid cooling plate, manufacturing method of aluminum-manganese alloy plate, sheet material, liquid cooling plate and like, heat exchanger and fluid conduction structure

Abstract

The invention discloses an aluminum-manganese alloy plate, a plate, a liquid cooling plate, a manufacturing method of the aluminum-manganese alloy plate, a manufacturing method of the plate, a manufacturing method of the liquid cooling plate, a heat exchanger and a fluid conduction structure, and the plate comprises the following components in percentage by weight: 0.2-0.8% of Si, 0.1-0.4% of Fe, 1.0-1.8% of Mn, 0.3-0.8% of Cu, not more than 0.05% of Mg, 0-0.1% of Ti, 0-0.3% of Zr and the balance of aluminum and inevitable impurities. The plate has fine and dispersed second-phase particles, the corrosion depth is smaller than 70 microns after an SWAAT test, the yield strength is larger than 60 Mpa after welding, the plate has high temperature resistance and corrosion resistance, the plate is obtained through the cast rolling process, and the manufacturing cost is lower compared with a hot rolling process.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum alloy processing technology, and in particular relates to an aluminum-manganese alloy plate and a manufacturing method thereof, a plate, a liquid cooling plate and a manufacturing method thereof, a heat exchanger, and a fluid conducting structure. Background Art

[0002] Al-Mn alloy materials are widely used in the field of heat exchange due to their advantages such as good forming performance, corrosion resistance and high strength, especially in heat exchange devices used in vehicles. At present, the Al-Mn alloy plates used in heat exchange devices used in vehicles are generally produced by hot rolling, which has a long process, low efficiency and high energy consumption. This leads to the high cost of Al-Mn alloy plates currently used in vehicle heat exchange devices. Therefore, it is urgent to develop a low-cost, corrosion-resistant and high-strength Al-Mn alloy plate. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide an aluminum-manganese alloy plate and a method for manufacturing the same, which has lower manufacturing cost than the hot rolling process.

[0004] In order to achieve the above purpose, the following technical solutions are adopted:

[0005] A method for manufacturing an aluminum-manganese alloy plate comprises the following steps:

[0006] Providing an aluminum-manganese alloy raw material, wherein the aluminum-manganese alloy raw material comprises 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages;

[0007] The aluminum-manganese alloy raw material is placed in a smelting furnace for smelting to obtain an Al-Mn alloy melt; the Al-Mn alloy melt is transferred to a refining furnace for refining;

[0008] Casting and rolling the refined Al-Mn alloy melt to obtain an Al-Mn alloy cast-rolled plate;

[0009] The Al-Mn alloy cast-rolled plate is subjected to a homogenization treatment;

[0010] Cold rolling the homogenized Al-Mn alloy cast-rolled plate;

[0011] The cold-rolled Al-Mn alloy cast sheet is subjected to recrystallization annealing.

[0012] In order to achieve the above purpose, the following technical solutions are adopted:

[0013] An aluminum-manganese alloy plate is obtained by the manufacturing method described in the above technical solution.

[0014] The manufacturing method of the above-mentioned aluminum-manganese alloy plate adopts 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and adopts a casting and rolling process to obtain the aluminum-manganese alloy plate. Compared with the traditional hot rolling process, this manufacturing method reduces energy consumption and saves costs, and the prepared aluminum-manganese alloy plate has higher strength and better corrosion resistance.

[0015] Another object of the present invention is to provide a plate material.

[0016] In order to achieve the above purpose, the following technical solutions are adopted:

[0017] A plate material, wherein the Si content of the plate material is 0.2%-0.8%, Fe 0.1%-0.4%, Mn 1.0%-1.8%, Cu 0.3%-0.8%, Mg not exceeding 0.05%, Ti 0%-0.1%, Zr 0%-0.3%, and the balance is aluminum and unavoidable impurities, and the above percentages are weight percentages.

[0018] When the Si and other elements of the plate are within the above range, the plate can have higher strength and better corrosion resistance.

[0019] Another object of the present invention is to provide a liquid cooling plate and a method for manufacturing the same.

[0020] In order to achieve the above purpose, the following technical solutions are adopted:

[0021] A liquid cooling plate, the liquid cooling plate having at least a first plate and a second plate, wherein the first plate contains 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the remainder is aluminum and unavoidable impurities, the above percentages being weight percentages;

[0022] The first side portion of the second plate has a flow channel, and the first plate is fixed to the first side portion by welding.

[0023] Since the first plate of the liquid cooling plate has elements such as Si in the above range and the first plate and the second plate are welded, the liquid cooling plate as a whole can have higher strength and better corrosion resistance.

[0024] In order to achieve the above purpose, the following technical solutions are adopted:

[0025] A method for manufacturing a liquid cooling plate comprises the following steps:

[0026] Provided is a first plate, which is obtained by casting and cold rolling processes; the first plate contains 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages;

[0027] providing a second plate, the second plate having a flow channel groove;

[0028] The first plate and the second plate are welded.

[0029] The first plate of the liquid cooling plate is obtained by casting and cold rolling processes, and the first plate has Si and other elements in the above-mentioned range, so the manufacturing cost is low, and the manufactured liquid cooling plate can have higher strength and better corrosion resistance.

[0030] Another object of the present invention is to provide a heat exchanger.

[0031] In order to achieve the above purpose, the following technical solutions are adopted:

[0032] A heat exchanger comprises at least a first plate, wherein the first plate contains 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages.

[0033] Since the first plate of the heat exchanger has the elements such as Si within the above range, the heat exchanger as a whole can have higher strength and better corrosion resistance.

[0034] Another object of the present invention is to provide a fluid conducting structure.

[0035] In order to achieve the above purpose, the following technical solutions are adopted:

[0036] A fluid conducting structure comprises at least a first plate, wherein the first plate contains 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages.

[0037] Since the first plate of the fluid conducting structure has elements such as Si in the above-mentioned range, the heat exchanger as a whole can have higher strength and better corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A scanning electron microscope image of an embodiment of the present invention;

[0039] Figure 2 This is the scanning electron microscope image of Comparative Example 1. DETAILED DESCRIPTION

[0040] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the following is only for illustration and not for limiting the present invention.

[0041] One aspect of the present invention is a processing method of Al-Mn alloy, especially for products with high strength, high pressure resistance, corrosion resistance, fatigue resistance and other properties, such as products with medium being high temperature and high pressure refrigerant. As an application scenario, it is particularly suitable for heat exchangers with high temperature and high pressure medium, and is particularly suitable for automotive heat exchangers. Since the medium in the heat exchanger has high pressure, and some of them may even have certain corrosiveness, the heat exchanger needs to have high strength, high pressure resistance, corrosion resistance, fatigue resistance and other properties. In order to make the heat exchange effect of the heat exchanger better, the heat exchanger material generally uses Al-Mn alloy. It is precisely because the heat exchanger requires high strength, high pressure resistance, corrosion resistance and other properties that casting and hot rolling processes are generally used to improve the performance of aluminum. This production process includes: casting, milling, homogenization, hot rolling, cold rolling, cleaning and annealing. Among them, milling leads to low yield and production efficiency. Hot rolling is to roll an aluminum plate ingot with a thickness of about 600mm into a hot-rolled plate of about 6mm, which requires a very large rolling force and very high energy consumption.

[0042] One aspect of the present invention is an improvement of an Al-Mn alloy casting and rolling process. The present invention manufactures Al-Mn alloy strips by the process of smelting, refining, casting and rolling, cold rolling and annealing. By controlling the proportion of raw materials and the process, the structural defects such as center segregation and coarse grains that are easily generated by the ordinary casting and rolling process are alleviated, and the fatigue performance and corrosion resistance of the material caused by the ordinary casting and rolling process are improved. The aluminum-manganese alloy material obtained by the casting and rolling process of the present invention can be applied to automobile heat exchange devices, such as plate heat exchangers, liquid cooling plates, etc., and this process has a short process, high efficiency, and low energy consumption, so that the cost of the cast-rolled Al-Mn material is significantly lower than that of the ordinary hot-rolled Al-Mn alloy material, and has strong promotion and application.

[0043] As an embodiment, a method for manufacturing an aluminum-manganese alloy plate comprises the following steps:

[0044] An aluminum-manganese alloy raw material is provided, wherein the content of Si is 0.2%-0.8%, Fe is 0.1%-0.4%, Mn is 1.0%-1.8%, Cu is 0.3%-0.8%, Mg is no more than 0.05%, Ti is 0%-0.1%, Zr is 0%-0.3%, and the balance is aluminum and unavoidable impurities, and the above percentages are weight percentages.

[0045] The aluminum-manganese alloy raw material is placed in a smelting furnace for smelting to obtain an Al-Mn alloy melt; and the Al-Mn alloy melt is transferred to a refining furnace for refining.

[0046] The refined Al-Mn alloy melt is cast-rolled to obtain an Al-Mn alloy cast-rolled plate; during the cast-rolling, the front box temperature is 680°C-700°C, the cooling water temperature is 25°C-35°C, the casting speed is 500mm / min-800mm / min, and the casting zone length is 35mm-55mm.

[0047] The Al-Mn alloy cast-rolled plate is subjected to a homogenization treatment.

[0048] The Al-Mn alloy cast-rolled plate after the homogenization treatment is cold rolled.

[0049] Cleaning cold-rolled Al-Mn alloy cast plate;

[0050] The cleaned Al-Mn alloy cast-rolled plate is subjected to recrystallization annealing.

[0051] The refined Al-Mn alloy melt is cast-rolled to obtain an Al-Mn alloy cast-rolled plate, and the thickness of the Al-Mn alloy cast-rolled plate is not greater than 8 mm.

[0052] When the Al-Mn alloy cast-rolled plate is cold-rolled, the total reduction rate of the cold-rolling is controlled to be 30-40%, so as to obtain a cast-rolled Al-Mn alloy plate with a thickness of 3-5 mm.

[0053] The homogenization treatment is performed on the cast-rolled Al-Mn alloy plate with a thickness of 3-5 mm; wherein the metal insulation temperature of the homogenization treatment is 450-560° C., and the metal insulation time is 8-16 hours.

[0054] Cold rolling the homogenized Al-Mn alloy plate strip comprises: cold rolling the homogenized cast Al-Mn alloy plate again; wherein the total reduction rate of cold rolling is 75-78%, and the cast Al-Mn alloy plate with a thickness of 1mm-1.5mm is obtained.

[0055] In this method, the ratio of each element in the aluminum-manganese alloy raw material is crucial.

[0056] Si: Adding a certain amount of Si to aluminum alloys can improve the strength of the alloy on the one hand; more importantly, adding a certain amount of Si to aluminum alloys containing high Mn and high Cu can form discontinuous second phase particles at the grain boundaries, reduce the width of the non-precipitated zone near the grain boundaries, and reduce the potential difference between the second phase particles and the aluminum matrix. These three points combined can effectively improve the corrosion resistance of the material. However, too high Si content will aggravate the central segregation of the cast plate and deteriorate the corrosion resistance and fatigue properties of the material; too low Si content is difficult to achieve the above-mentioned purpose of improving corrosion resistance. The preferred range of Si content is 0.4%-0.6%, for example, 0.42%-0.57%, 0.43%-0.54%, 0.44%-0.58%, 0.43%-0.48%, 0.49%-0.57%, 0.50%-0.59%, etc.

[0057] Fe: Adding a certain amount of Fe to aluminum alloys can improve the strength of the alloy to a certain extent, but the effect is very limited. And Fe will increase the potential difference between the second phase particles and the aluminum matrix, thereby deteriorating the corrosion resistance of the material. Therefore, it is necessary to limit the Fe content in the alloy. However, considering the inevitable Fe contained in aluminum alloys, especially in aluminum alloy recycling materials, the Fe content will be relatively higher. If the lower Fe content is limited, the cost of raw materials will be higher. Therefore, a certain amount of Fe is allowed in the present invention, and the preferred Fe content range is 0.2%-0.3%, for example, 0.22%-0.28%, 0.22%-0.26%, 0.24%-0.29%, 0.25%-0.28%, 0.23%-0.27%, 0.26%-0.28%, etc.

[0058] Mn: As the main alloying element in Al-Mn alloy, Mn can significantly improve the corrosion resistance of aluminum alloy through solid solution strengthening without significantly sacrificing its corrosion resistance. However, too high Mn content will aggravate the central segregation during the casting and rolling process, thereby deteriorating the corrosion resistance and fatigue properties of the aluminum alloy material. Too low Mn content makes it difficult to meet the strength requirements of aluminum alloy materials. The preferred range of Mn content is 1.4%-1.7%, such as 1.42%-1.68%, 1.43%-1.65%, 1.45%-1.68%, 1.44%-1.67%, 1.46%-1.69%, 1.41%-1.65%, etc.

[0059] Cu: Adding a certain amount of Cu to aluminum alloy can significantly improve the strength of aluminum alloy material through solid solution strengthening, but too high Cu content will increase the potential difference between the second phase particles and the aluminum matrix, and will aggravate the center segregation during the casting process, thereby deteriorating the corrosion resistance and fatigue performance of the material. Too low Cu content is difficult to meet the strength requirements of aluminum alloy materials. The preferred range of Cu content is 0.45%-0.65%, for example, 0.46%-0.63%, 0.47%-0.62%, 0.48%-0.6%, 0.48%-0.58%, 0.48%-0.55%, 0.49-0.57%.

[0060] Mg: Mg has a very significant solid solution strengthening effect in aluminum alloys, but in the present invention, the Mg content needs to be strictly limited to no more than 0.08%, the purpose of which is to be able to use the aluminum alloy material in the brazing process later. This is because Mg will react with the brazing flux, reduce the activity of the brazing flux, and reduce the brazing quality. In particular, when used in the tunnel furnace gas shielded brazing process, the Mg content does not exceed 0.05%.

[0061] Ti: Ti is mainly added to aluminum alloys in the form of Al-Ti-B wires, and mainly plays a role in grain refinement. However, in cast-rolled Al-Mn alloys, due to the fast cooling rate of casting and rolling, the grain size is already very small, and there is no need to add too much Ti content to refine the grains. And too high Ti content will lead to Ti deposition, and in severe cases, it will lead to local coarse grains in the cast-rolled plate. The preferred range of Ti content is 0.01%-0.05%, for example, 0.02%-0.045%, 0.015%-0.043%, 0.03%-0.04%, 0.02%-0.04%.

[0062] Zr: Adding a certain amount of Zr to aluminum alloys can have a certain precipitation strengthening effect. More importantly, combined with the unique rapid cooling characteristics of the casting and rolling process, a very high supersaturation can be formed, and fine dispersed second-phase particles can be formed during the subsequent homogenization process. Such particles can pin the grain boundaries during the subsequent recrystallization annealing, which can refine the grains on the one hand and increase the volume fraction of small-angle grain boundaries on the other hand, both of which are beneficial to improving the corrosion resistance and strength of aluminum alloy materials. However, when the Zr content is too high, it is easy to form coarse primary Al 3 Zr phase, thereby deteriorating the material's formability and corrosion resistance; when the Zr content is too low, it is difficult to achieve the above effect. The preferred range of Zr content is 0.1%-0.2%, for example, 0.12%-0.18%, 0.13%-0.17%, 0.14%-0.16%, 0.15%-0.19%.

[0063] The thickness of the aluminum-manganese alloy plate obtained by the above processing method is not more than 2mm, and the Si content in the plate accounts for 0.2%-0.8%, Fe 0.1%-0.4%, Mn 1.0%-1.8%, Cu 0.3%-0.8%, Mg no more than 0.05%, Ti0%-0.1%, Zr 0%-0.3%, and the balance is aluminum and unavoidable impurities, and the above percentages are weight percentages; the plate has fine dispersed second phase particles, the average size of the second phase particles does not exceed 4μm, and the maximum size does not exceed 6μm. The corrosion depth of the plate is less than 70um after SWAAT test (cyclic acid seawater salt spray test), and the yield strength of the plate after brazing is greater than 60Mpa. This plate has high strength, good corrosion resistance and strong fatigue resistance.

[0064] As another embodiment, a method for manufacturing a liquid cooling plate is provided, comprising the following steps:

[0065] A first plate is provided, the first plate is obtained by casting and cold rolling, and the processing method of the first plate refers to the manufacturing method of the aluminum-manganese alloy plate described above; the Si content in the first plate is 0.2%-0.8%, Fe 0.1%-0.4%, Mn 1.0%-1.8%, Cu 0.3%-0.8%, Mg not exceeding 0.05%, Ti0%-0.1%, Zr 0%-0.3%, and the balance is aluminum and unavoidable impurities, and the above percentages are weight percentages. Since the metal alloy ratio and performance are closely related, further, referring to the above, the Si content in the first plate is 0.4%-0.6%, the Mn content is 1.4%-1.7%, the Fe content is 0.2%-0.3%, the Cu content is 0.45%-0.65%, the Mg content is not more than 0.05%, the Ti content is 0.01%-0.05%, and the Zr content is 0.1%-0.2%.

[0066] A second plate is provided; the second plate is punched; the purpose of punching the second plate is to form a flow channel groove on the second plate, for example, the second plate can be used as a flow channel plate.

[0067] The processing method of the second plate may also refer to the manufacturing method of the aluminum-manganese alloy plate described above, and the processing method of the second plate may also adopt other process methods.

[0068] As an implementation mode, at least one of the first plate and the second plate is coated with a brazing flux; the brazing flux coating includes spraying the brazing flux, rolling the brazing flux, and the like.

[0069] The first plate and the second plate are brazed, for example, by means of a tunnel furnace.

[0070] In this way, a flow channel for accommodating a fluid can be formed between the first plate and the second plate, so that the fluid flows inside the liquid cooling plate and can be used to exchange heat with external parts. For example, the liquid cooling plate can be used to cool or heat a vehicle battery.

[0071] As another embodiment, the first plate and the second plate may not be coated with flux, and may be welded by, for example, vacuum furnace brazing.

[0072] As another embodiment, the second plate can also have solder by, for example, rolling, or the second plate can have solder itself by other means, so as to facilitate welding with the first plate. That is, the second plate can have a solder layer for welding with the first plate.

[0073] As another embodiment, a liquid cooling plate is provided, the liquid cooling plate having at least a first plate and a second plate, the thickness of the first plate is not more than 2 mm, and the Si content in the plate is 0.2%-0.8%, Fe 0.1%-0.4%, Mn1.0%-1.8%, Cu 0.3%-0.8%, Mg not exceeding 0.05%, Ti 0%-0.1%, Zr 0%-0.3%, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages; the first side of the second plate has a flow channel groove; the first plate is welded and fixed to the first side of the second plate. Further, the first plate and the second plate can be welded by a brazing process.

[0074] The first plate of the liquid cooling plate is made by the manufacturing method of the above-mentioned aluminum-manganese alloy plate. The corrosion depth of the first plate after SWAAT test is less than 70um, and the yield strength after brazing is greater than 60Mpa. The first plate has fine dispersed second phase particles, and the average size of the second phase particles does not exceed 4μm, and the maximum size does not exceed 6μm. The first plate has high strength, good corrosion resistance, and strong fatigue resistance. In this way, compared with the hot rolling and other processes in the background technology, the liquid cooling plate of this embodiment not only has a low processing cost, but also can meet the use requirements of the liquid cooling plate.

[0075] As another embodiment, a heat exchanger is provided, comprising at least a first plate, wherein the Si content of the first plate is 0.2%-0.8%, Fe 0.1%-0.4%, Mn 1.0%-1.8%, Cu 0.3%-0.8%, Mg not exceeding 0.05%, Ti0%-0.1%, Zr 0%-0.3%, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages.

[0076] The heat exchanger has a plurality of stacked plates, at least one of which is welded and fixed to the first plate; the heat exchanger has at least a first fluid channel and a second fluid channel, and the first fluid channel and the second fluid channel are not connected in the heat exchanger;

[0077] The thickness of the first plate is not more than 2 mm, and the first plate has fine dispersed second phase particles, the average size of the second phase particles does not exceed 4 μm, and the maximum size does not exceed 6 μm; and / or the corrosion depth of the first plate after SWAAT test is less than 70 μm, and the yield strength after welding is greater than 60 MPa; and / or the Si content of the first plate is 0.4%-0.6%, the Mn content is 1.4%-1.7%, the Fe content is 0.2%-0.3%, the Cu content is 0.45%-0.65%, the Mg content does not exceed 0.05%, the Ti content is 0.01%-0.05%, and the Zr content is 0.1%-0.2%.

[0078] The heat exchanger may be a plate heat exchanger, which has a first plate, such as a mounting plate, and a plurality of stacked plates, wherein a first fluid channel and a second fluid channel are formed between adjacent plates, wherein the fluid in the first fluid channel can be used for heat exchange with the fluid in the second fluid channel. Since the first plate of the heat exchanger has the above-mentioned range of elements such as Si, the heat exchanger as a whole can have higher strength and better corrosion resistance.

[0079] Since the first plate of the heat exchanger has the elements such as Si within the above range, the heat exchanger as a whole can have higher strength and better corrosion resistance.

[0080] As another embodiment, a fluid conducting structure includes at least a first plate, wherein the Si content of the first plate is 0.2%-0.8%, Fe 0.1%-0.4%, Mn 1.0%-1.8%, Cu 0.3%-0.8%, Mg not exceeding 0.05%, Ti0%-0.1%, Zr 0%-0.3%, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages.

[0081] The fluid conducting structure comprises a connecting structure, the connecting structure has a flow channel groove, and the connecting structure is assembled and fixed to the first plate or welded;

[0082] The thickness of the first plate is not more than 2 mm, and the first plate has fine dispersed second phase particles, the average size of the second phase particles does not exceed 4 μm, and the maximum size does not exceed 6 μm; and / or the corrosion depth of the first plate after SWAAT test is less than 70 μm, and the yield strength after welding is greater than 60 MPa; and / or the Si content of the first plate is 0.4%-0.6%, the Mn content is 1.4%-1.7%, the Fe content is 0.2%-0.3%, the Cu content is 0.45%-0.65%, the Mg content does not exceed 0.05%, the Ti content is 0.01%-0.05%, and the Zr content is 0.1%-0.2%.

[0083] The fluid conducting structure is, for example, a fluid conducting structure used in a vehicle thermal management system. The fluid conducting structure may have multiple fluid channels, for example, for connecting different components. In addition, the fluid conducting structure may also be used to receive multiple parts, for example, multiple valves.

[0084] Since the first plate of the fluid conducting structure has elements such as Si in the above-mentioned range, the heat exchanger as a whole can have higher strength and better corrosion resistance.

[0085] The technical solution of the present invention is described below through specific embodiments.

[0086] Example 1

[0087] A method for manufacturing an aluminum-manganese alloy plate comprises the following steps:

[0088] Step S1, providing an aluminum-manganese alloy raw material, wherein Si 0.45%, Fe 0.21%, Mn 1.50%, Cu 0.50%, Mg 0.03%, Ti 0.02%, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages.

[0089] Step S2, smelting and refining: the Al-Mn alloy raw material is placed in a smelting furnace for smelting, specifically, firstly, an aluminum ingot is added to the smelting furnace, heated to 750°C, then Si and Cu alloy elements are added in the form of an intermediate alloy, Fe and Mn elements are added in the form of an iron agent and a manganese agent, and stirred evenly to obtain an Al-Mn alloy melt; the Al-Mn alloy melt is transferred to a refining furnace for refining. Specifically, at 740°C, a refining agent is added for refining for 25 minutes, and after refining, the refining is allowed to stand for 10 minutes before slagging.

[0090] Step S3, casting and rolling: the refined Al-Mn alloy melt is cast and rolled to obtain an Al-Mn alloy cast-rolled plate; during casting and rolling, the front box temperature is 690°C, the cooling water temperature is 30°C, the casting and rolling speed is 700mm / min, and the casting and rolling zone length is 50mm, so that a cast-rolled plate with a thickness of 6.8mm is obtained.

[0091] Step S4, homogenization treatment: homogenization treatment is performed on the Al-Mn alloy cast-rolled plate, wherein the metal insulation temperature of the homogenization treatment is 480° C. and the metal insulation time is 10 hours.

[0092] Step S5, cold rolling: the Al-Mn alloy cast-rolled plate after homogenization treatment is cold rolled again, wherein the total reduction ratio of cold rolling is 85%, and the cast-rolled Al-Mn alloy plate with a thickness of 1 mm is obtained.

[0093] Step S6, cleaning: cleaning the 1 mm cast Al-Mn alloy plate after cold rolling in step S5. The purpose of cleaning is to remove aluminum ash on the surface of the cast plate and improve the brazing quality of the cast plate during brazing.

[0094] Step S7, recrystallization annealing: The cleaned cast Al-Mn alloy plate is subjected to recrystallization annealing to obtain a cast aluminum-manganese alloy plate. The metal insulation temperature of the recrystallization annealing is 370°C, the metal insulation time is 3h, and the heating method is a box-type annealing furnace. The aluminum-manganese alloy plate is obtained in this way. The scanning electron microscope image of the aluminum-manganese alloy plate is as follows: Figure 1 As shown, the plate has fine dispersed second phase particles, the average size of the second phase particles does not exceed 4 μm, and the maximum size does not exceed 6 μm.

[0095] Example 2

[0096] A method for manufacturing an aluminum-manganese alloy plate comprises the following steps:

[0097] Step S1: Ingredients: Si 0.45%, Fe 0.21%, Mn 1.50%, Cu 0.50%, Mg 0.03%, Ti 0.02%, and the balance is aluminum and unavoidable impurities.

[0098] Step S2, smelting and refining: the Al-Mn alloy raw material is placed in a smelting furnace for smelting, specifically, firstly, an aluminum ingot is added to the smelting furnace, heated to 750°C, then Si and Cu alloy elements are added in the form of an intermediate alloy, Fe and Mn elements are added in the form of an iron agent and a manganese agent, and stirred evenly to obtain an Al-Mn alloy melt; the Al-Mn alloy melt is transferred to a refining furnace for refining. Specifically, at 740°C, a refining agent is added for refining for 25 minutes, and after refining, the refining is allowed to stand for 10 minutes before slagging.

[0099] Step S3, casting and rolling: the refined Al-Mn alloy melt is cast and rolled to obtain an Al-Mn alloy cast and rolled plate; during the casting and rolling, the front box temperature is 695°C, the cooling water temperature is 32°C, the casting and rolling speed is 690mm / min, and the casting and rolling zone length is 48mm. A cast and rolled plate with a thickness of 7.0mm is obtained.

[0100] Step S4, cold rolling: cold rolling the cast-rolled plate with a thickness of 7.0 mm, wherein the total reduction ratio of the cold rolling is 30%, and a cast-rolled Al-Mn alloy plate with a thickness of 4.9 mm is obtained.

[0101] Step S5, homogenization treatment: homogenization treatment is performed on the cold-rolled 4.9 mm thick Al-Mn alloy plate, wherein the metal insulation temperature of the homogenization treatment is 500° C. and the metal insulation time is 10 hours.

[0102] Step S6, cold rolling: the homogenized 4.9 mm thick Al-Mn alloy plate is cold rolled again, wherein the total cold rolling reduction is 79.6%, and a cast Al-Mn alloy plate with a thickness of 1 mm is obtained.

[0103] Step S7, cleaning: cleaning the 1 mm cast Al-Mn alloy plate after cold rolling in step 6. The purpose of cleaning is to remove aluminum ash on the surface of the cast plate and improve the brazing quality of the cast plate during brazing.

[0104] Step S8, recrystallization annealing: the cleaned cast-rolled Al-Mn alloy plate is subjected to recrystallization annealing, wherein the metal holding temperature of the recrystallization annealing is 380°C, the metal holding time is 3h, and the heating method adopts a box-type annealing furnace.

[0105] Example 3

[0106] A method for manufacturing an aluminum-manganese alloy plate comprises the following steps:

[0107] Step S1: Ingredients: Si 0.50%, Fe 0.25%, Mn 1.55%, Cu 0.55%, Mg 0.04%, Ti 0.03%, and the balance is aluminum and unavoidable impurities.

[0108] Step S2, smelting and refining: the Al-Mn alloy raw material is placed in a smelting furnace for smelting, specifically, firstly, an aluminum ingot is added to the smelting furnace, heated to 750°C, then Si and Cu alloy elements are added in the form of an intermediate alloy, Fe and Mn elements are added in the form of an iron agent and a manganese agent, and stirred evenly to obtain an Al-Mn alloy melt; the Al-Mn alloy melt is transferred to a refining furnace for refining. Specifically, at 740°C, a refining agent is added for refining for 25 minutes, and after refining, the refining is allowed to stand for 10 minutes before slagging.

[0109] Step S3, casting and rolling: the refined Al-Mn alloy melt is cast and rolled to obtain an Al-Mn alloy cast and rolled plate; during the casting and rolling, the front box temperature is 695°C, the cooling water temperature is 32°C, the casting and rolling speed is 690mm / min, and the casting and rolling zone length is 48mm. A cast and rolled plate with a thickness of 7.0mm is obtained.

[0110] Step S4, cold rolling: cold rolling the cast-rolled plate with a thickness of 7.0 mm, wherein the total reduction ratio of the cold rolling is 30%, and a cast-rolled Al-Mn alloy plate with a thickness of 4.9 mm is obtained.

[0111] Step S5, homogenization treatment: homogenization treatment is performed on the cold-rolled 4.9 mm thick Al-Mn alloy plate, wherein the metal insulation temperature of the homogenization treatment is 500° C. and the metal insulation time is 10 hours.

[0112] Step S6, cold rolling: the homogenized 4.9 mm thick Al-Mn alloy plate is cold rolled again, wherein the total reduction ratio of the cold rolling is 79.6%, and a cast Al-Mn alloy plate with a thickness of 1 mm is obtained.

[0113] Step S7, cleaning: cleaning the 1 mm cast Al-Mn alloy plate after cold rolling in step 6. The purpose of cleaning is to remove aluminum ash on the surface of the cast plate and improve the brazing quality of the cast plate during brazing.

[0114] Step S8, recrystallization annealing: the cleaned cast-rolled Al-Mn alloy plate is subjected to recrystallization annealing, wherein the metal holding temperature of the recrystallization annealing is 380°C, the metal holding time is 3h, and the heating method adopts a box-type annealing furnace.

[0115] Example 4

[0116] A method for manufacturing an aluminum-manganese alloy plate comprises the following steps:

[0117] Step S1: Ingredients: Si 0.50%, Fe 0.25%, Mn 1.55%, Cu 0.55%, Mg 0.04%, Ti 0.03%, and the balance is aluminum and unavoidable impurities.

[0118] Step S2, smelting and refining: the Al-Mn alloy raw material is placed in a smelting furnace for smelting, specifically, firstly, an aluminum ingot is added to the smelting furnace, heated to 750°C, then Si and Cu alloy elements are added in the form of an intermediate alloy, Fe and Mn elements are added in the form of an iron agent and a manganese agent, and stirred evenly to obtain an Al-Mn alloy melt; the Al-Mn alloy melt is transferred to a refining furnace for refining. Specifically, at 740°C, a refining agent is added for refining for 25 minutes, and after refining, the refining is allowed to stand for 10 minutes before slagging.

[0119] Step S3, casting and rolling: the refined Al-Mn alloy melt is cast and rolled to obtain an Al-Mn alloy cast and rolled plate; during the casting and rolling, the front box temperature is 685°C, the cooling water temperature is 29°C, the casting and rolling speed is 680mm / min, and the casting and rolling zone length is 49mm. A cast and rolled plate with a thickness of 7.0mm is obtained.

[0120] Step S4, cold rolling: cold rolling the cast-rolled plate with a thickness of 7.0 mm, wherein the total reduction ratio of the cold rolling is 40%, and a cast-rolled Al-Mn alloy plate with a thickness of 4.2 mm is obtained.

[0121] Step S5, homogenization treatment: homogenization treatment is performed on the cold-rolled 4.2 mm thick Al-Mn alloy plate, wherein the metal insulation temperature of the homogenization treatment is 520° C. and the metal insulation time is 10 hours.

[0122] Step S6, cold rolling: the homogenized 4.2 mm thick Al-Mn alloy plate is cold rolled again, wherein the total reduction ratio of the cold rolling is 76.2%, and a cast Al-Mn alloy plate with a thickness of 1 mm is obtained.

[0123] Step S7, cleaning: cleaning the 1 mm cast Al-Mn alloy plate after cold rolling in step 6. The purpose of cleaning is to remove aluminum ash on the surface of the cast plate and improve the brazing quality of the cast plate during brazing.

[0124] Step S8, recrystallization annealing: the cleaned cast-rolled Al-Mn alloy plate is subjected to recrystallization annealing, wherein the metal holding temperature of the recrystallization annealing is 360°C, the metal holding time is 3h, and the heating method adopts a box-type annealing furnace.

[0125] Example 5

[0126] A method for manufacturing an aluminum-manganese alloy plate comprises the following steps:

[0127] Step S1: Ingredients: Si 0.55%, Fe 0.30%, Mn 1.65%, Cu 0.60%, Mg 0.02%, Ti 0.015%, and the balance is aluminum and unavoidable impurities.

[0128] Step S2, smelting and refining: the Al-Mn alloy raw material is placed in a smelting furnace for smelting, specifically, firstly, an aluminum ingot is added to the smelting furnace, heated to 750°C, then Si and Cu alloy elements are added in the form of an intermediate alloy, Fe and Mn elements are added in the form of an iron agent and a manganese agent, and stirred evenly to obtain an Al-Mn alloy melt; the Al-Mn alloy melt is transferred to a refining furnace for refining. Specifically, at 740°C, a refining agent is added for refining for 25 minutes, and after refining, the refining is allowed to stand for 10 minutes before slagging.

[0129] Step S3, casting and rolling: the refined Al-Mn alloy melt is cast and rolled to obtain an Al-Mn alloy cast and rolled plate; during the casting and rolling, the front box temperature is 685°C, the cooling water temperature is 29°C, the casting and rolling speed is 680mm / min, and the casting and rolling zone length is 49mm. A cast and rolled plate with a thickness of 7.0mm is obtained.

[0130] Step S4, cold rolling: cold rolling the cast-rolled plate with a thickness of 7.0 mm, wherein the total reduction ratio of the cold rolling is 40%, and a cast-rolled Al-Mn alloy plate with a thickness of 4.2 mm is obtained.

[0131] Step S5, homogenization treatment: homogenization treatment is performed on the cold-rolled 4.2 mm thick Al-Mn alloy plate, wherein the metal insulation temperature of the homogenization treatment is 520° C. and the metal insulation time is 10 hours.

[0132] Step S6, cold rolling: the homogenized 4.2 mm thick Al-Mn alloy plate is cold rolled again, wherein the total reduction ratio of the cold rolling is 76.2%, and a cast Al-Mn alloy plate with a thickness of 1 mm is obtained.

[0133] Step S7, cleaning: cleaning the 1 mm cast Al-Mn alloy plate after cold rolling in step 6. The purpose of cleaning is to remove aluminum ash on the surface of the cast plate and improve the brazing quality of the cast plate during brazing.

[0134] Step S8, recrystallization annealing: the cleaned cast-rolled Al-Mn alloy plate is subjected to recrystallization annealing, wherein the metal holding temperature of the recrystallization annealing is 360°C, the metal holding time is 3h, and the heating method adopts a box-type annealing furnace.

[0135] Example 6

[0136] A method for manufacturing an aluminum-manganese alloy plate comprises the following steps:

[0137] Step S1: Ingredients: Si 0.55%, Fe 0.30%, Mn 1.65%, Cu 0.60%, Mg 0.02%, Ti 0.015%, and the balance is aluminum and unavoidable impurities.

[0138] Step S2, smelting and refining: the Al-Mn alloy raw material is placed in a smelting furnace for smelting, specifically, firstly, an aluminum ingot is added to the smelting furnace, heated to 750°C, then Si and Cu alloy elements are added in the form of an intermediate alloy, Fe and Mn elements are added in the form of an iron agent and a manganese agent, and stirred evenly to obtain an Al-Mn alloy melt; the Al-Mn alloy melt is transferred to a refining furnace for refining. Specifically, at 740°C, a refining agent is added for refining for 25 minutes, and after refining, the refining is allowed to stand for 10 minutes before slagging.

[0139] Step S3, casting and rolling: the refined Al-Mn alloy melt is cast and rolled to obtain an Al-Mn alloy cast and rolled plate; during the casting and rolling, the front box temperature is 685°C, the cooling water temperature is 29°C, the casting and rolling speed is 680mm / min, and the casting and rolling zone length is 49mm. A cast and rolled plate with a thickness of 7.0mm is obtained.

[0140] Step S4, cold rolling: cold rolling the cast-rolled plate with a thickness of 7.0 mm, wherein the total reduction ratio of the cold rolling is 40%, and a cast-rolled Al-Mn alloy plate strip with a thickness of 4.2 mm is obtained.

[0141] Step S5, homogenization treatment: homogenization treatment is performed on the cold-rolled 4.2 mm thick Al-Mn alloy plate, wherein the metal insulation temperature of the homogenization treatment is 520° C. and the metal insulation time is 10 hours.

[0142] Step S6, cold rolling: the homogenized 4.2 mm thick Al-Mn alloy plate is cold rolled again, wherein the total reduction ratio of the cold rolling is 76.2%, and a cast-rolled Al-Mn alloy plate strip with a thickness of 1 mm is obtained.

[0143] Step S7, cleaning: cleaning the 1 mm cast Al-Mn alloy plate after cold rolling in step 6. The purpose of cleaning is to remove aluminum ash on the surface of the cast plate and improve the brazing quality of the cast plate during brazing.

[0144] Step S8, recrystallization annealing: the cleaned cast-rolled Al-Mn alloy plate is subjected to recrystallization annealing, wherein the metal holding temperature of the recrystallization annealing is 360°C, the metal holding time is 0.5h, and the heating method adopts an air cushion annealing furnace.

[0145] Comparative Example

[0146] In order to illustrate the high strength, corrosion resistance and fatigue resistance of the cast-rolled Al-Mn alloy plate produced in the above embodiment, a comparative example is provided below for comparative explanation. The comparative alloy composition range and production process are shown in the following table.

[0147]

[0148] Comparative Example 1

[0149] The production is carried out according to the Al-Mn alloy composition and process commonly used in the current heat exchange device, wherein the alloy composition is consistent with the composition of Example 1. The production process is carried out in a hot rolling manner, that is, batching, smelting and refining, casting, milling, homogenization treatment, hot rolling, cold rolling, cleaning and recrystallization annealing are carried out in sequence. The thickness of the ingot obtained by casting is 630mm, and the thickness after milling is 600mm. The holding temperature for homogenization treatment is 600℃, and the holding time is 10h. The hot rolling start temperature is 500℃, the hot rolling final rolling temperature is 330℃, and the hot rolled plate thickness is 5.5mm. The total cold rolling reduction is 81.8%, the recrystallization annealing temperature is 345℃, and the holding time is 3h. Finally, a 1mm Al-Mn alloy plate and strip is obtained. The scanning electron microscope image of the plate refers to Figure 2 , it can be seen that the second phase particles are relatively coarse.

[0150] Comparative Example 2

[0151] The ingredients are prepared according to the Al-Mn alloy composition commonly used in the current heat exchange device, wherein the alloy composition is consistent with the composition of Example 1 of the present invention. However, the production process adopts the casting and rolling process commonly used in other Al-Mn alloys. That is, the ingredients are prepared, smelting and refining, casting and rolling, cold rolling, cleaning, and recrystallization annealing are carried out in sequence. Among them, the temperature of the box before casting and rolling is 695°C, the cooling water temperature is 33°C, the casting and rolling speed is 820mm / min, and the length of the casting and rolling zone is 52mm. A cast-rolled plate with a thickness of 7.0mm is obtained. The total cold rolling reduction rate is 85.7%. The recrystallization annealing temperature is 370°C, and the holding time is 3h. Finally, a 1mm Al-Mn alloy plate and strip is obtained.

[0152] Comparative Example 3

[0153] The ingredients are prepared according to the 3003 alloy composition of the current common Al-Mn alloy grade, and the production process also adopts the common 3003 alloy casting and rolling process. That is, the ingredients are prepared, smelting and refining, casting and rolling, cold rolling, cleaning, and recrystallization annealing are carried out in sequence. Among them, the temperature of the front box of casting and rolling is 695℃, the cooling water temperature is 33℃, the casting and rolling speed is 820mm / min, and the length of the casting and rolling zone is 52mm. A cast-rolled plate with a thickness of 7.0mm is obtained. The total cold rolling reduction rate is 85.7%. The recrystallization annealing temperature is 370℃, and the holding time is 3h. Finally, a 1mm Al-Mn alloy plate strip is obtained.

[0154] The Al-Mn alloy plates obtained in the above comparative example and the above examples 1-6 are stamped to obtain the mounting plate of the brazed liquid cooling plate, which is assembled into a liquid cooling plate together with the aluminum alloy flow channel plate with a solder layer, and then brazed. Before brazing, both the mounting plate and the flow channel plate need to be degreased, and the brazing layer of the flow channel plate is sprayed with brazing. The obtained liquid cooling plate is subjected to a burst test, a neutral salt spray corrosion test, and a pressure alternation test. Among them, the neutral salt spray corrosion test standard is GB / T31467.3-2015; the pressure alternation test conditions are: frequency 1Hz, minimum pressure 0.2bar, maximum pressure 2.0bar, number of cycles 200,000 times, medium 50% antifreeze, and medium temperature 25°C. At the same time, the above-mentioned plate and strip are subjected to simulated brazing treatment, and the mechanical properties after brazing are compared and tested. The results are shown in the following table.

[0155]

[0156] It can be seen from the test results of the above comparative examples and embodiments 1-6 that the present invention, based on the newly designed alloy composition, combines the coordinated regulation of key parameters of the casting and rolling process and the low-temperature annealing process to solve the problems of central segregation and coarse grains that are prone to occur under the new alloy composition conditions, and significantly improves the strength, corrosion resistance and fatigue properties of the Al-Mn alloy material.

[0157] It should be noted that the above embodiments are only used to illustrate the present invention but not to limit the technical solutions described in the present invention, such as the directional definitions of "front", "back", "left", "right", "up" and "down". Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be combined, modified or replaced by each other, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A method for manufacturing an aluminum-manganese alloy plate, It is characterized in that The following steps are involved: Providing an aluminum-manganese alloy raw material, wherein the aluminum-manganese alloy raw material comprises 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages; The aluminum-manganese alloy raw material is placed in a smelting furnace for smelting to obtain an Al-Mn alloy melt; the Al-Mn alloy melt is transferred to a refining furnace for refining; Casting and rolling the refined Al-Mn alloy melt to obtain an Al-Mn alloy cast-rolled plate; The Al-Mn alloy cast-rolled plate is subjected to a homogenization treatment; Cold rolling the homogenized Al-Mn alloy cast-rolled plate; The cold-rolled Al-Mn alloy cast sheet is subjected to recrystallization annealing.

2. The method for manufacturing an aluminum-manganese alloy plate according to claim 1, It is characterized in that During casting and rolling, the front box temperature is 680℃-700℃, the cooling water temperature is 25℃-35℃, the casting and rolling speed is 500mm / min-800mm / min, and the casting and rolling zone length is 35mm-55mm; And / or the refined Al-Mn alloy melt is cast-rolled to obtain an Al-Mn alloy cast-rolled plate, wherein the thickness of the Al-Mn alloy cast-rolled plate is not greater than 8 mm.

3. The method for manufacturing an aluminum-manganese alloy plate according to claim 1 or 2, It is characterized in that The following steps are involved: When the Al-Mn alloy cast-rolled plate is cold-rolled, the total reduction rate of the cold-rolling is controlled to be 30-40%, so as to obtain a cast-rolled Al-Mn alloy plate with a thickness of 3-5 mm; The homogenization treatment is performed on the cast-rolled Al-Mn alloy plate with a thickness of 3-5 mm; wherein the metal insulation temperature of the homogenization treatment is 450-560° C., and the metal insulation time is 8-16 hours.

4. The method for manufacturing an aluminum-manganese alloy plate according to claim 3, It is characterized in that The cold rolling of the homogenized Al-Mn alloy plate strip comprises: cold rolling the homogenized cast Al-Mn alloy plate again; wherein the total reduction ratio of cold rolling is 75-78%, and the cast Al-Mn alloy plate with a thickness of 1mm-1.5mm is obtained.

5. The method for manufacturing an aluminum-manganese alloy plate according to any one of claims 1 to 4, It is characterized in that In the aluminum-manganese alloy raw material, Si content is 0.4%-0.6%, Mn content is 1.4%-1.7%, Fe content is 0.2%-0.3%, Cu content is 0.45%-0.65%, Mg content does not exceed 0.05%, Ti content is 0.01%-0.05%, and Zr content is 0.1%-0.2%.

6. An aluminum-manganese alloy plate, It is characterized in that The aluminum-manganese alloy plate is obtained by the manufacturing method described in any one of claims 1 to 5.

7. A sheet material, It is characterized in that The plate contains 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages.

8. The sheet material according to claim 7, It is characterized in that The thickness of the plate is not greater than 2 mm, and the plate has fine dispersed second phase particles, the average size of the second phase particles does not exceed 4 μm, and the maximum size does not exceed 6 μm; and / or the corrosion depth of the plate after SWAAT test is less than 70 μm, and the yield strength after welding is greater than 60 MPa.

9. A liquid cooling plate, the liquid cooling plate having at least a first plate and a second plate, It is characterized in that The first plate contains 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the balance is aluminum and unavoidable impurities, the above percentages are weight percentages; The first side portion of the second plate has a flow channel, and the first plate is fixed to the first side portion by welding.

10. The liquid cooling plate according to claim 9, It is characterized in that The thickness of the first plate is not greater than 2 mm, and the corrosion depth of the first plate after SWAAT test is less than 70 um, and the yield strength after welding is greater than 60 MPa; and / or the first plate has fine dispersed second phase particles, the average size of the second phase particles does not exceed 4 μm and the maximum size does not exceed 6 μm; And / or in the plate material of the first plate, the Si content is 0.4%-0.6%, the Mn content is 1.4%-1.7%, the Fe content is 0.2%-0.3%, the Cu content is 0.45%-0.65%, the Mg content does not exceed 0.05%, the Ti content is 0.01%-0.05%, and the Zr content is 0.1%-0.2%.

11. A method for manufacturing a liquid cooling plate, It is characterized in that The following steps are involved: Provided is a first plate, which is obtained by casting and cold rolling processes; the first plate contains 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages; providing a second plate having a flow channel; The first plate and the second plate are welded.

12. The method for manufacturing a liquid cooling plate according to claim 11, Features: The casting and cold rolling process comprises the following steps: An aluminum-manganese alloy raw material containing 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the balance being aluminum and unavoidable impurities, with the above percentages by weight, is placed in a smelting furnace for smelting to obtain an Al-Mn alloy melt; the Al-Mn alloy melt is transferred to a refining furnace for refining; Casting and rolling the refined Al-Mn alloy melt to obtain an Al-Mn alloy cast-rolled plate; The Al-Mn alloy cast-rolled plate is subjected to a homogenization treatment; Cold rolling the homogenized Al-Mn alloy cast-rolled plate; The Al-Mn alloy cast plate after cold rolling is subjected to recrystallization annealing to obtain the first plate.

13. The method for manufacturing a liquid cooling plate according to claim 12, Features: Applying a flux to at least one of the first plate and the second plate; brazing the first plate and the second plate by tunnel furnace brazing; or the second plate has a solder layer, and the first plate and the second plate are welded; Alternatively, the first plate and the second plate are brazed by vacuum furnace.

14. A heat exchanger comprising at least a first plate, It is characterized in that The first plate contains 0.2%-0.8% Si, 0.1%-0.4% Fe, 1.0%-1.8% Mn, 0.3%-0.8% Cu, no more than 0.05% Mg, 0%-0.1% Ti, 0%-0.3% Zr, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages.

15. The heat exchanger according to claim 14, It is characterized in that The heat exchanger comprises a plurality of stacked plates, at least one of which is welded and fixed to the first plate; the heat exchanger comprises at least a first fluid channel and a second fluid channel; The thickness of the first plate is not more than 2 mm, and the first plate has fine dispersed second phase particles, the average size of the second phase particles does not exceed 4 μm, and the maximum size does not exceed 6 μm; and / or the corrosion depth of the first plate after SWAAT test is less than 70 μm, and the yield strength after welding is greater than 60 MPa; and / or the Si content of the first plate is 0.4%-0.6%, the Mn content is 1.4%-1.7%, the Fe content is 0.2%-0.3%, the Cu content is 0.45%-0.65%, the Mg content does not exceed 0.05%, the Ti content is 0.01%-0.05%, and the Zr content is 0.1%-0.2%.

16. A fluid conducting structure, It is characterized in that At least a first plate is included, wherein the Si content of the first plate is 0.2%-0.8%, Fe 0.1%-0.4%, Mn 1.0%-1.8%, Cu 0.3%-0.8%, Mg not exceeding 0.05%, Ti 0%-0.1%, Zr 0%-0.3%, and the remainder is aluminum and unavoidable impurities, and the above percentages are weight percentages.

17. The fluid conducting structure according to claim 16, It is characterized in that The fluid conducting structure comprises a connecting structure, the connecting structure has a flow channel groove, and the connecting structure is assembled and fixed to the first plate or welded and fixed; The thickness of the first plate is not more than 2 mm, and the first plate has fine dispersed second phase particles, the average size of the second phase particles does not exceed 4 μm, and the maximum size does not exceed 6 μm; and / or the corrosion depth of the first plate after SWAAT test is less than 70 μm, and the yield strength after welding is greater than 60 MPa; and / or the Si content of the first plate is 0.4%-0.6%, the Mn content is 1.4%-1.7%, the Fe content is 0.2%-0.3%, the Cu content is 0.45%-0.65%, the Mg content does not exceed 0.05%, the Ti content is 0.01%-0.05%, and the Zr content is 0.1%-0.2%.

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