Method for preparing aluminum-manganese alloy through electrodeposition of electrolyte at room temperature

Abstract

The invention discloses a method for preparing an aluminum-manganese alloy through room-temperature electrolyte electro-deposition, and belongs to the technical field of metallurgy. According to the method, triethylamine hydrochloride and aluminum chloride are adopted to prepare room-temperature electrolyte, anhydrous manganese chloride or manganese bromide is used as manganese salt, and the aluminum-manganese alloy is prepared through electro-deposition under the low-temperature non-aqueous condition. According to the method, stable deposition of the aluminum-manganese alloy layer can be achieved on the surface of the magnesium-lithium alloy without a high-temperature condition, the components of the deposited aluminum-manganese alloy layer are more uniform, and accurate control over the manganese content in the deposited layer can be achieved. Meanwhile, the aluminum-manganese alloy plating layer obtained through electroplating of the method is compact in structure, the corrosion resistance and the service reliability of a matrix are remarkably improved, and the method is particularly suitable for surface protection of active metal materials such as magnesium-lithium alloy.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical technology, specifically relating to a method for preparing aluminum-manganese alloys using room temperature electrolyte electrodeposition. Background Technology

[0002] Magnesium-lithium alloys possess advantages such as low density and high specific strength, making them valuable in aerospace, transportation, and electronics industries. However, their high chemical reactivity and poor corrosion resistance, particularly in chlorine-containing media, severely restrict their engineering applications. Therefore, preparing metal or alloy coatings with good protective properties on the surface of magnesium-lithium alloys is an effective way to improve their service reliability. Aluminum and its alloys, due to their low density, high specific strength, excellent electrical and thermal conductivity, and good corrosion resistance, exhibit good compatibility with magnesium alloys and are considered ideal surface protection materials for magnesium-lithium alloys. Among them, aluminum-manganese alloys, by introducing manganese, can improve the microstructure and corrosion resistance of aluminum-based materials to a certain extent, thus showing potential application advantages in the field of protective coatings. Currently, the industrial production of aluminum-manganese alloys mainly relies on traditional metallurgical processes such as smelting, casting, and hot rolling. However, the melting point of metallic aluminum and the electrolytic production temperature are both above 660℃, requiring the smelting process of aluminum-manganese alloys to be carried out at even higher temperatures, resulting in high energy consumption, long process flow, and complex equipment. Electrodeposition technology, as a low-temperature and energy-saving material preparation method, provides an efficient solution for the preparation of aluminum-manganese alloys.

[0003] Electrodeposition can prepare uniform, dense alloy coatings with controllable microstructures on substrates with complex shapes, greatly shortening the process flow, reducing energy consumption, and achieving microstructures that are difficult to obtain through traditional metallurgy. Aluminum and manganese are both highly electrochemically active metals with significant differences in their standard electrode potentials. They readily undergo hydrogen evolution reactions in traditional aqueous electrolytes, making stable deposition difficult. Furthermore, aluminum and manganese readily form stable oxides or hydroxides in aqueous solutions, further increasing the difficulty of metal deposition and alloying. Due to these limitations, aqueous electroplating methods are generally insufficient for the effective preparation of aluminum-manganese alloy coatings.

[0004] While inorganic molten salt systems such as sodium chloride-aluminum chloride can achieve efficient aluminum deposition, the operating temperature is typically around 200℃, causing severe corrosion to equipment, resulting in high energy consumption. Furthermore, they are difficult to integrate with temperature-sensitive substrates, affecting their microstructure and mechanical properties. Additionally, at high temperatures, the deposition behavior and composition control of manganese are challenging, making it difficult to obtain aluminum-manganese alloy coatings with uniform composition and dense structure. Organic solvent electrolytes mainly consist of organic solvents such as ethers (THF) and aromatic hydrocarbons, combined with aluminum salts and complexing agents (such as LiAlH4). Most organic solvents are flammable and explosive, and the electrodeposited aluminum coatings are rough, porous, and have poor adhesion, making co-deposition of alloying elements difficult. Room-temperature ionic liquids, represented by 1-methyl-3-ethylimidazolium chloride-aluminum chloride (EMIC-AlCl3), are currently a research hotspot. Imidazole-based ionic liquid systems can achieve electrodeposition of aluminum and its alloys at room temperature. However, the synthesis and purification of organic cations in imidazole-based ionic liquid systems are costly, hindering large-scale industrial application. They are also sensitive to water and air, requiring specific operating environments, significantly increasing costs. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a method for preparing aluminum-manganese alloys using a room-temperature electrolyte prepared from triethylamine hydrochloride and aluminum chloride, and anhydrous manganese chloride or manganese bromide as the manganese salt via low-temperature electrodeposition. This method significantly reduces energy consumption and production costs while efficiently preparing aluminum-manganese alloys.

[0006] The technical solution of the present invention is as follows:

[0007] A method for preparing aluminum-manganese alloys using room temperature electrolyte electrodeposition includes the following process steps:

[0008] Pretreatment: The magnesium-lithium alloy is pretreated to obtain a magnesium-lithium alloy with no surface impurities for later use;

[0009] Electrolyte preparation: At room temperature, triethylamine hydrochloride and aluminum chloride are mixed and stirred until the aluminum chloride is completely dissolved to obtain a room temperature electrolyte. Then, manganese salt is added to the room temperature electrolyte and stirred until the mixture is homogeneous.

[0010] Electrodeposition: using a pretreated magnesium-lithium alloy as the cathode and an aluminum sheet as the anode, electrolysis is carried out in an electrolyte solution;

[0011] Cleaning: After electrodeposition, the magnesium-lithium alloy sample was removed and cleaned with acetonitrile to obtain aluminum-manganese alloy deposited on the surface of the magnesium-lithium alloy.

[0012] During the pretreatment process, the surface of the magnesium-lithium alloy substrate undergoes mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating, and copper plating in sequence.

[0013] In the pretreatment process, the zinc immersion treatment involves immersing the magnesium-lithium alloy in a mixed solution containing potassium pyrophosphate, sodium fluoride, sodium carbonate, and zinc sulfate at 50°C to 70°C for 5 to 10 minutes, with a stirring speed of 100 r / min to 300 r / min. The zinc plating treatment involves immersing the zinc-immersed magnesium-lithium alloy in a mixed solution containing zinc sulfate, potassium pyrophosphate, sodium fluoride, sodium carbonate, ammonium citrate, phytic acid, and vanillin at 40°C to 50°C, using the zinc-immersed magnesium-lithium alloy as the cathode and the zinc sheet as the anode, at a speed of 1 mA / cm². 2 ~5mA / cm 2 Electrolysis for 10-30 minutes yields a zinc-plated magnesium-lithium alloy. Copper plating is performed in a mixed solution containing copper pyrophosphate, potassium pyrophosphate, sodium tartrate, and potassium dihydrogen phosphate at 40-60°C. The zinc-plated magnesium-lithium alloy is used as the cathode, and a copper sheet as the anode, at a current of 1 mA / cm². 2 ~5mA / cm 2 Electrolysis for 20-30 minutes yields a copper-magnesium-lithium alloy.

[0014] During the preparation of the electrolyte, the stirring time is 4h~6h, the stirring speed is 200r / min~400r / min; the molar ratio of aluminum chloride to triethylamine hydrochloride is (1.5:1)~(2.0:1); the manganese salt is manganese chloride or manganese bromide; the concentration of manganese salt in the electrolyte is 0.01mol / L~0.06mol / L.

[0015] During the electrodeposition process, a constant potential is used for electrodeposition, the deposition temperature is 20℃~60℃, the voltage during the electrodeposition process is -0.4V vs Al to -1.0V vs Al, and the deposition time is 0.5h~2h; where "vs Al" means that the aluminum electrode is used as the reference electrode.

[0016] The method described in this invention has the following advantages:

[0017] 1. This invention involves electroplating a high-quality zinc and copper composite layer onto the surface of a magnesium-lithium alloy, which is prone to oxidation and corrosion in an atmospheric environment, followed by direct electrodeposition of an aluminum-manganese alloy coating using an aluminum chloride-triethylamine hydrochloride system. Compared to traditional molten salt electrodeposition technology, this invention achieves stable deposition of an aluminum-manganese alloy layer on the magnesium-lithium alloy surface without the need for high-temperature conditions. The deposited aluminum-manganese alloy layer has a more uniform composition and allows for precise control of the manganese content in the deposited layer.

[0018] 2. The non-aqueous electroplating deposition provided by the present invention avoids the problems of difficult deposition of aluminum and manganese, as well as hydrogen embrittlement and substrate corrosion in aqueous electroplating. The coating is denser and smoother, while the metal coatings of physical vapor deposition often have columnar gaps, which accelerate galvanic corrosion.

[0019] 3. The aluminum-manganese alloy coating obtained by the method provided in this invention has a dense structure, which significantly improves the corrosion resistance and service reliability of the substrate, and is especially suitable for surface protection of reactive metal materials such as magnesium-lithium alloys. It also solves the problem of limited coverage of complex-shaped workpieces by other deposition methods, enabling the electrodeposition of aluminum-manganese alloy layers on large-area substrates, and has good prospects for industrial applications.

[0020] 4. This invention, by adjusting the amount of manganese chloride added to the electrolyte system and controlling the electrodeposition potential, deposition time, and temperature, ensures that the electrodeposition process remains stable within the electrochemical window of aluminum-manganese synergistic deposition. In the aluminum chloride-triethylamine hydrochloride electrolyte system, the system has a wide electrochemical stability window and few side reactions. Manganese participates in deposition in the form of complexed ions, and the deposition rate is closely related to the effective concentration of manganese ions in the electrolyte and the electrochemical parameters. This results in good adjustability and repeatability of the manganese content in the aluminum-manganese alloy layer, achieving precise control of the manganese content. Attached Figure Description

[0021] Figure 1 This is a surface morphology diagram of the aluminum-manganese alloy layer electrodeposited on a magnesium-lithium alloy substrate provided in Embodiment 15 of the present invention;

[0022] Figure 2 The polarization curve of the aluminum-manganese alloy layer electrodeposited on the magnesium-lithium alloy substrate provided in Example 15 of the present invention. Detailed Implementation

[0023] This invention provides a method for preparing aluminum-manganese alloys using room temperature electrolyte electrodeposition, comprising the following process steps:

[0024] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0025] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride are mixed at a molar ratio of (1.5:1) to (2.0:1) and stirred at 200 r / min to 400 r / min for 4 h to 6 h until the aluminum chloride is completely dissolved to obtain a room temperature electrolyte; add manganese salt (manganese chloride or manganese bromide) to the room temperature electrolyte until the manganese salt concentration is 0.01 mol / L to 0.06 mol / L, and continue stirring until the mixture is homogeneous.

[0026] Electrodeposition: A magnesium-lithium alloy substrate with surface pretreatment is used as the cathode and a high-purity aluminum sheet is used as the anode. The substrate is fixed in a room-temperature electrolyte with added manganese salt to form an electrolysis system. Electrolysis reaction is carried out under constant voltage and temperature conditions in the electrolysis system: Electrodeposition is performed at 20℃~60℃ and -0.4V vs Al to -1.0V vs Al for 0.5h~2h.

[0027] Cleaning: After electrodeposition, the cathode is removed, and the residual electrolyte on the surface is cleaned with acetonitrile. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface can be obtained.

[0028] In the following embodiments of the present invention, the mechanical grinding-ultrasonic cleaning-alkaline washing-activation treatment-cleaning-cold air drying-zinc immersion-zinc plating-copper plating process is as follows: the magnesium-lithium alloy is sequentially ground with 400#, 800#, 1200# and 2000# SiC sandpaper for 10 min to 30 min, then ultrasonically cleaned in anhydrous ethanol for 5 min to 20 min; then alkaline washing is performed in a mixed solution containing sodium hydroxide, sodium carbonate and sodium phosphate at 40℃ to 60℃ for 10 min to 20 min; followed by activation in a mixed solution containing phosphoric acid and ammonium bifluoride for 5 s to 10 s. After activation treatment, the magnesium-lithium alloy sheet is cleaned and dried with cold air. It is then immersed in a mixed solution containing potassium pyrophosphate, sodium fluoride, sodium carbonate, and zinc sulfate at 50℃~70℃ for 5min~10min under stirring speed of 100r / min~300r / min for zinc immersion treatment. Subsequently, the zinc-immersed magnesium-lithium alloy sheet is subjected to zinc plating treatment in a mixed solution containing zinc sulfate, potassium pyrophosphate, sodium fluoride, sodium carbonate, ammonium citrate, phytic acid, and vanillin at 40℃~50℃, using the zinc-immersed magnesium-lithium alloy as the cathode and the zinc sheet as the anode, at a flux of 1mA / cm. 2 ~5mA / cm 2 Electrolysis for 10-30 minutes yields a zinc-plated magnesium-lithium alloy. Copper plating is performed in a mixed solution containing copper pyrophosphate, potassium pyrophosphate, sodium tartrate, and potassium dihydrogen phosphate at 40-60°C. The zinc-plated magnesium-lithium alloy is used as the cathode, and a copper sheet as the anode, with an electroplating rate of 1 mA / cm². 2 ~5mA / cm 2 Electrolysis for 20-30 minutes yields a copper-magnesium-lithium alloy.

[0029] The following non-limiting embodiments are intended to enable those skilled in the art to more fully understand the invention, but do not limit the invention in any way.

[0030] Unless otherwise specified, the experimental methods described in the following examples are conventional methods; unless otherwise specified, the reagents and materials are commercially available.

[0031] The aluminum sheet electrode used in this embodiment of the invention is a high-purity aluminum sheet with a purity greater than 99.99%. The purity of triethylamine hydrochloride is ≥99%, anhydrous aluminum chloride is ≥99%, sodium hydroxide is >98%, sodium carbonate is ≥99.5%, sodium phosphate is ≥96.0%, phosphoric acid is 85.0%, ammonium bifluoride is not less than 99.99%, potassium pyrophosphate is ≥98%, sodium fluoride is ≥99%, zinc sulfate is ≥99%, ammonium citrate is ≥98.5%, phytic acid is 50%, vanillin is ≥99%, copper pyrophosphate is >98%, sodium tartrate is ≥98%, and potassium dihydrogen phosphate is ≥99%.

[0032] In this embodiment of the invention, the Shanghai Chenhua Electrochemical Workstation is used as the electrolysis power source.

[0033] In this embodiment of the invention, field emission scanning electron microscopy (FE-SEM) combined with energy dispersive spectroscopy (EDS) was used to analyze the morphology and composition of the aluminum-manganese coating.

[0034] The present invention will be further described below with reference to specific embodiments.

[0035] Example 1:

[0036] This embodiment provides a method for preparing aluminum-manganese alloys using room temperature electrolyte electrodeposition, comprising the following process steps:

[0037] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0038] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.5:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0039] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 30 °C and an applied potential of -0.4 V vs Al.

[0040] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 75.86% and 1.85%, respectively.

[0041] Example 2:

[0042] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0043] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0044] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 30 °C and an applied potential of -0.4 V vs Al.

[0045] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 89.84% and 2.23%, respectively.

[0046] Example 3:

[0047] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0048] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 2.0:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0049] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 30 °C and an applied potential of -0.4 V vs Al.

[0050] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 92.53% and 2.01%, respectively.

[0051] The weight percentages of aluminum and manganese in the aluminum-manganese alloys prepared in Examples 1-3 are shown in Table 1.

[0052] Table 1. Aluminum and manganese content in the manganese-aluminum alloys obtained in Examples 1-3;

[0053] ;

[0054] As shown in Table 1, under the same deposition voltage, temperature, time, and manganese chloride concentration, when the molar ratio of aluminum chloride to triethylamine hydrochloride increases from 1.5:1 to 2.0:1, the manganese content in the electrodeposited aluminum-manganese alloys remains relatively consistent, while the aluminum content increases significantly with increasing molar ratio. The preferred molar ratio of aluminum chloride to triethylamine hydrochloride is 1.7:1.

[0055] Example 4:

[0056] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0057] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0058] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 20 °C and an applied potential of -0.4 V vs Al.

[0059] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 83.65% and 1.92%, respectively.

[0060] Example 5:

[0061] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0062] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0063] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 40 °C and an applied potential of -0.4 V vs Al.

[0064] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 81.81% and 3.43%, respectively.

[0065] Example 6:

[0066] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0067] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0068] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 50 °C and an applied potential of -0.4 V vs Al.

[0069] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 83.75% and 3.78%, respectively.

[0070] Example 7:

[0071] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0072] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0073] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 60 °C and an applied potential of -0.4 V vs Al.

[0074] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 85.69% and 4.01%, respectively.

[0075] The weight percentages of aluminum and manganese in the aluminum-manganese alloys prepared in Examples 2, 4-7 are shown in Table 2:

[0076] Table 2. Aluminum and manganese content in the manganese-aluminum alloys obtained in Examples 2, 4-7;

[0077] ;

[0078] As can be seen from the results of Examples 2, 4 to 7 above, under the same material ratio, electrodeposition voltage and electrodeposition time, the aluminum content in the aluminum-manganese alloy obtained by increasing the deposition temperature from 20℃ to 60℃ remains above 80%, and the manganese content increases significantly.

[0079] Example 8:

[0080] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0081] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0082] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 30 °C and an applied potential of -0.6 V vs Al.

[0083] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 86.39% and 3.08%, respectively.

[0084] Example 9:

[0085] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0086] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0087] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 30 °C and an applied potential of -0.8 V vs Al.

[0088] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove any residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 85.74% and 3.96%, respectively.

[0089] Example 10:

[0090] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0091] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0092] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 30 °C and an applied potential of -1.0 V vs Al.

[0093] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 87.12% and 2.95%, respectively.

[0094] The weight percentages of aluminum and manganese in the aluminum-manganese alloys obtained in Examples 2, 8, and 10 are shown in Table 3.

[0095] Table 3. Aluminum and manganese content in the manganese-aluminum alloys obtained in Examples 2, 8-10;

[0096] ;

[0097] As can be seen from the results of Examples 2, 8-10 above, under the same material ratio, deposition temperature and time conditions, when the electrodeposition voltage is adjusted from -0.4V to -1.0V, the aluminum content in the aluminum-manganese alloy prepared by electrodeposition decreases and the manganese content increases significantly. However, when the voltage is further adjusted to -1.0V, the manganese content shows a decreasing trend.

[0098] Example 11:

[0099] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0100] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0101] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Under the conditions of an electrodeposition temperature of 30 °C and an applied potential of -0.4 V vs Al, electrodeposition was carried out in the electrolyte for 0.5 h.

[0102] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 70.92% and 0.96%, respectively.

[0103] Example 12:

[0104] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0105] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.01 mol / L. The mixture was stirred until it was homogeneous.

[0106] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 2 hours at an electrodeposition temperature of 30 °C and an applied potential of -0.4 V vs Al.

[0107] Cleaning: After electrodeposition, the cathode is removed, and the surface is cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface is obtained. EDS analysis results show that the weight percentages of aluminum and manganese are 85.17% and 5.74%, respectively.

[0108] The weight percentages of aluminum and manganese in the aluminum-manganese alloys prepared in Examples 2, 11, and 12 are shown in Table 4.

[0109] Table 4. Aluminum-manganese content ratio in the manganese-aluminum alloys obtained in Examples 2, 11, and 12;

[0110] ;

[0111] As can be seen from Examples 2 and 11-12 above, under the same material ratio, electrodeposition temperature and voltage conditions, the aluminum and manganese content in the aluminum-manganese alloy obtained by extending the electrodeposition time from 0.5h to 1h increases significantly. When the time is extended to 2h, the aluminum content decreases, indicating that the aluminum in the electrolyte has been completely deposited and the electrolyte begins to decompose. Therefore, the electrodeposition time should not be too long.

[0112] Example 13:

[0113] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0114] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.02 mol / L. The mixture was stirred until it was homogeneous.

[0115] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 30 °C and an applied potential of -0.4 V vs Al.

[0116] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 83.65% and 6.79%, respectively.

[0117] Example 14:

[0118] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0119] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.04 mol / L. The mixture was stirred until it was homogeneous.

[0120] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 30 °C and an applied potential of -0.4 V vs Al.

[0121] Cleaning: After electrodeposition, the cathode is removed, and the surface is cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface is obtained. EDS analysis results show that the weight percentages of aluminum and manganese are 82.91% and 11.55%, respectively.

[0122] Example 15:

[0123] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0124] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, controlling the molar ratio of aluminum chloride to triethylamine hydrochloride to be 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, thus obtaining a room temperature electrolyte. Then, manganese chloride was added to the electrolyte until the concentration of manganese chloride in the electrolyte was 0.06 mol / L. The mixture was stirred until it was homogeneous.

[0125] Electrodeposition: A 50 mL flat-mouthed beaker was used as the electrolytic cell for the reaction. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1 cm × 1 cm), and a high-purity aluminum sheet was used as the anode (effective area 1 cm × 2 cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The electrodeposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was carried out in the electrolyte for 1 hour at an electrodeposition temperature of 30 °C and an applied potential of -0.4 V vs Al.

[0126] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 83.90% and 14.11%, respectively.

[0127] The weight percentages of aluminum and manganese in the aluminum-manganese alloys obtained in Examples 2, 13-15 are shown in Table 5.

[0128] Table 5. Aluminum-manganese content ratio in the manganese-aluminum alloys obtained in Examples 2, 13-15;

[0129] ;

[0130] As can be seen from the results of Examples 2, 13-15 above, when the concentration of manganese chloride increases from 0.01 mol / L to 0.06 mol / L, the manganese content in the resulting aluminum-manganese alloy increases significantly from 2.23% to 14.11%.

[0131] SEM images of the products obtained on the cathode in Example 15 are as follows: Figure 1 As shown in the figure, the aluminum-manganese alloy is deposited as spherical particles on the cathode plate, with no dendrites appearing during the formation process. The manganese content in the electrodeposited aluminum-manganese alloy layer gradually increases with increasing concentration. Appropriate manganese addition to the coating can reduce dendrite growth, making the coating surface smoother, and can also alleviate the internal stress of the pure aluminum deposition layer, improving its adhesion to the substrate. Magnesium-lithium alloys are inherently reactive; the electrodeposited aluminum-manganese coating on its surface mainly acts as a barrier layer. The dense, manganese-containing coating can better isolate the substrate from corrosive media, improving the overall corrosion resistance of the substrate.

[0132] Figure 2 The polarization curves of the original magnesium-lithium alloy substrate, the magnesium-lithium alloy substrate after aluminum plating, and the magnesium-lithium alloy substrate after aluminum-manganese alloy plating are shown. The polarization potential and corrosion current density indicate the corrosion resistance of the coating. The lower the corrosion current density, the better the corrosion resistance. The calculated corrosion potential of the original magnesium-lithium alloy substrate is -1.7846V, and the corrosion current density is 1.74mA / cm². 2 The corrosion potential of the substrate after aluminum plating is -1.5511V, and the corrosion current density is 0.102mA / cm².2 The corrosion potential of the substrate after aluminum-manganese alloy plating is -1.5914V, and the corrosion current density is 8.16×10⁻⁶. -3 mA / cm 2 The corrosion resistance of the aluminum-manganese alloy coating is reduced by two orders of magnitude compared to the original substrate and by one order of magnitude compared to the substrate after aluminum plating, indicating that the coating has good corrosion resistance.

[0133] Example 16:

[0134] Pretreatment: The magnesium-lithium alloy surface is pretreated by mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating and copper plating to obtain a copper-plated magnesium-lithium alloy.

[0135] Electrolyte preparation: At room temperature, triethylamine hydrochloride and anhydrous aluminum chloride were mixed and stirred, with the molar ratio of aluminum chloride to triethylamine hydrochloride controlled at 1.7:1. The mixture was stirred at 200 r / min for 4 h to completely dissolve the aluminum chloride, resulting in a room temperature electrolyte. Then, manganese bromide was added to the electrolyte at a concentration of 0.06 mol / L, and stirring was continued until the mixture was homogeneous.

[0136] Electrodeposition: A 50mL beaker was used as the electrolytic cell. A pre-treated magnesium-lithium alloy substrate was used as the cathode (effective area 1cm × 1cm), and a high-purity aluminum sheet was used as the anode (effective area 1cm × 2cm). Both were fixed in the electrolyte to form the electrolytic system. The electrolytic reaction was carried out under constant voltage and temperature conditions in the electrolytic system. The deposition temperature was controlled by a magnetically heated stirrer. Electrodeposition was performed in the electrolyte for 1 hour at a deposition temperature of 30℃ and an applied potential of -0.4V vs Al.

[0137] Cleaning: After electrodeposition, the cathode was removed, and the surface was cleaned with acetonitrile to remove residual electrolyte. After vacuum drying, the aluminum-manganese alloy deposited on the magnesium-lithium alloy surface was obtained. EDS analysis results showed that the weight percentages of aluminum and manganese were 85.33% and 12.19%, respectively.

Claims

1. A method for preparing aluminum-manganese alloys using room temperature electrolyte electrodeposition, characterized in that, The process includes the following steps: Pretreatment: The magnesium-lithium alloy is pretreated to obtain a magnesium-lithium alloy with no surface impurities for later use; Electrolyte preparation: At room temperature, triethylamine hydrochloride and aluminum chloride are mixed and stirred until the aluminum chloride is completely dissolved to obtain a room temperature electrolyte. Then, manganese salt is added to the room temperature electrolyte and stirred continuously until the mixture is uniform. The molar ratio of aluminum chloride to triethylamine hydrochloride is (1.5:1) to (2.0:1). Electrodeposition: using a pretreated magnesium-lithium alloy as the cathode and an aluminum sheet as the anode, electrolysis is carried out in an electrolyte solution; Cleaning: After electrodeposition, the magnesium-lithium alloy sample was removed and cleaned with acetonitrile to obtain aluminum-manganese alloy deposited on the surface of the magnesium-lithium alloy.

2. The method for preparing aluminum-manganese alloy by room temperature electrolyte electrodeposition according to claim 1, characterized in that, During the pretreatment process, the surface of the magnesium-lithium alloy substrate undergoes mechanical grinding, ultrasonic cleaning, alkaline washing, activation treatment, cleaning, cold air drying, zinc immersion, zinc plating, and copper plating in sequence.

3. The method for preparing aluminum-manganese alloy by room temperature electrolyte electrodeposition according to claim 2, characterized in that, The zinc immersion treatment involves immersing the magnesium-lithium alloy in a mixed solution containing potassium pyrophosphate, sodium fluoride, sodium carbonate, and zinc sulfate at 50°C to 70°C for 5 to 10 minutes, with a stirring speed of 100 r / min to 300 r / min.

4. The method for preparing aluminum-manganese alloy by room temperature electrolyte electrodeposition according to claim 2, characterized in that, The zinc plating process involves immersing a magnesium-lithium alloy in a mixed solution containing zinc sulfate, potassium pyrophosphate, sodium fluoride, sodium carbonate, ammonium citrate, phytic acid, and vanillin at 40°C to 50°C. The zinc-plated alloy is used as the cathode, and the zinc sheet as the anode, at a flux of 1 mA / cm². 2 ~5mA / cm 2 Electrolysis for 10 to 30 minutes yields a zinc-magnesium-lithium alloy.

5. The method for preparing aluminum-manganese alloy by room temperature electrolyte electrodeposition according to claim 2, characterized in that, Copper plating is performed in a mixed solution containing copper pyrophosphate, potassium pyrophosphate, sodium tartrate, and potassium dihydrogen phosphate at 40℃~60℃. A zinc-plated magnesium-lithium alloy is used as the cathode, and a copper sheet as the anode, at a flux of 1 mA / cm². 2 ~5mA / cm 2 Electrolysis for 20-30 minutes yields a copper-magnesium-lithium alloy.

6. A method for preparing aluminum-manganese alloy by room temperature electrolyte electrodeposition according to claim 1 or 2, characterized in that, During the preparation of the electrolyte, the stirring time is 4h to 6h and the stirring speed is 200r / min to 400r / min.

7. A method for preparing aluminum-manganese alloy by room temperature electrolyte electrodeposition according to claim 1 or 2, characterized in that, The manganese salt is manganese chloride or manganese bromide; the concentration of the manganese salt in the electrolyte is 0.01 mol / L to 0.06 mol / L.

8. A method for preparing aluminum-manganese alloy by room temperature electrolyte electrodeposition according to claim 1 or 2, characterized in that, During the electrodeposition process, a constant potential is used for electrodeposition, the deposition temperature is 20℃~60℃, the voltage during the electrodeposition process is -0.4V vs Al to -1.0V vs Al, and the deposition time is 0.5h~2h.

Images