A magnesium-lithium alloy heat pipe and a surface treatment method and application thereof

Abstract

The application relates to the technical field of space surface treatment, and discloses a magnesium-lithium alloy heat pipe and a surface treatment method and application thereof. The application adopts a process route of pretreatment, protection and chemical conversion, adopts a suitable etching and neutralization process formula in the pretreatment, removes the oxide skin formed in the surface forming process of the magnesium-lithium alloy material, reduces the resistance in the welding process, and is beneficial to the formation of a welded joint. Meanwhile, the magnesium-lithium alloy heat pipe can also have corrosion resistance, so that the magnesium-lithium alloy heat pipe surface is not corroded and oxidized before welding and coating. In the chemical conversion, a chemical conversion formula containing zirconium and fluorine is adopted to form a micro-nano structure surface with large roughness on the surface of the magnesium-lithium alloy heat pipe, so that the bonding strength of the subsequent anticorrosive paint is improved. The whole process ensures the removal of the oxide skin of the magnesium-lithium alloy heat pipe surface to-be-welded area and the welding quality, and also ensures the coating bonding strength of the magnesium-lithium alloy heat pipe coating area, so that the packaging and corrosion prevention of the magnesium-lithium alloy heat pipe are effectively ensured.

Description

A magnesium-lithium alloy heat pipe, its surface treatment method and application Technical Field

[0001] This application relates to the field of space surface treatment technology, and in particular to a magnesium-lithium alloy heat pipe and its surface treatment method and application. Background Technology

[0002] As spacecraft models continue to evolve, the demand for larger and lighter spacecraft payloads is becoming increasingly apparent. At the same time, with the development of missions such as deep space exploration, it is necessary to further reduce payload weight in order to meet launch weight requirements. This places high demands on the lightweighting and weight reduction of components such as optical cameras and laser communication payloads.

[0003] Spacecraft payloads such as optical cameras and laser communication components generate significant heat during operation, requiring heat pipes and other methods for heat dissipation to maintain a relatively constant camera temperature. This prevents issues like optical axis shifts, image distortion, and component failure caused by temperature variations. Traditional spacecraft heat pipes, typically made of stainless steel or aluminum alloy, have a high density, which cannot meet weight reduction requirements.

[0004] Magnesium-lithium alloys have advantages such as low density, but they are also highly chemically reactive and prone to corrosion in air, forming a loose oxide film that cannot meet the requirements for subsequent welding and coating. If conventional pre-coating treatment methods are used, a thick oxide film quickly forms on the surface of magnesium-lithium alloys, which is also insufficient for welding. Therefore, it is necessary to perform surface treatment in sections to meet the welding and coating requirements of magnesium-lithium alloy heat pipes. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a magnesium-lithium alloy heat pipe and a surface treatment method thereof, so that the magnesium-lithium alloy heat pipe can effectively reduce the oxide scale in the welding area, improve the welding quality, increase the surface roughness of the coating area, and improve the adhesion strength between the coating and the magnesium-lithium alloy heat pipe.

[0006] Another objective of this application is to provide the application of the aforementioned magnesium-lithium alloy heat pipe in the manufacture of spacecraft components and to specifically provide a spacecraft component.

[0007] To solve the aforementioned technical problems / achieve the aforementioned objectives, or at least partially solve the aforementioned technical problems / achieve the aforementioned objectives, as a first aspect of this application, a method for surface treatment of a magnesium-lithium alloy heat pipe is provided, comprising:

[0008] Step 1: Clean the surface of the magnesium-lithium alloy heat pipe;

[0009] Step 2: Use an etching solution to remove oxide scale from the magnesium-lithium alloy heat pipe, clean it, neutralize it with a neutralizing solution, and then clean and dry it; the etching solution includes sodium hexametaphosphate, sodium succinate, ammonium fluoride and hexamethylenetetramine, and the neutralizing solution includes potassium permanganate, tartaric acid and boric acid;

[0010] Step 3: Protect the area of ​​the magnesium-lithium alloy heat pipe to be welded;

[0011] Step 4: Apply a chemical conversion film to the magnesium-lithium alloy heat pipe using an impregnation solution, wherein the impregnation solution includes potassium fluorozirconate, ammonium bifluoride, and sodium perborate.

[0012] Step 5: Clean and dry the magnesium-lithium alloy heat pipe, remove the protective coating from the area to be welded, and obtain the surface-treated magnesium-lithium alloy heat pipe.

[0013] Optionally, the etching solution comprises 90 g / L to 110 g / L sodium hexametaphosphate, 20 g / L to 30 g / L sodium succinate, 5 g / L to 10 g / L ammonium fluoride, and 1 g / L to 2 g / L hexamethylenetetramine.

[0014] Optionally, the neutralizing solution comprises 10 g / L to 20 g / L potassium permanganate, 15 g / L to 25 g / L tartaric acid, and 5 g / L to 10 g / L boric acid.

[0015] Optionally, the impregnation solution comprises 10 g / L to 20 g / L potassium fluorozirconate, 3 g / L to 5 g / L ammonium bifluoride, and 2 g / L to 4 g / L sodium perborate.

[0016] As a second aspect of this application, a magnesium-lithium alloy heat pipe prepared by the aforementioned surface treatment method is provided.

[0017] As a third aspect of this application, the application of the aforementioned magnesium-lithium alloy heat pipe in the manufacture of spacecraft components is provided.

[0018] Optionally, the spacecraft components include optical cameras and laser communication components.

[0019] As a fourth aspect of this application, a spacecraft component is provided, including the magnesium-lithium alloy heat pipe described in this application.

[0020] This application employs a process route of pretreatment, protection, and chemical conversion. In the pretreatment stage, a suitable etching and neutralization formulation is used to remove the thick oxide scale formed during the molding process of the magnesium-lithium alloy material, reducing resistance during welding and facilitating the formation of the weld joint. Simultaneously, it provides a certain degree of corrosion resistance, ensuring that the surface of the magnesium-lithium alloy heat pipe does not corrode or oxidize before welding coating. The chemical conversion stage uses a formulation containing zirconium and fluorine, which can form a micro-nano structure surface with a relatively large roughness on the magnesium-lithium alloy heat pipe surface, which is beneficial to improving the bonding strength of the subsequent anti-corrosion paint. The entire surface treatment process ensures both the removal of oxide scale and welding quality in the areas to be welded on the magnesium-lithium alloy heat pipe surface, and the coating bonding strength in the coated areas of the magnesium-lithium alloy heat pipe, effectively guaranteeing the encapsulation and corrosion protection of the magnesium-lithium alloy heat pipe. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0022] Figure 1 shows a flowchart of the surface treatment method of this application;

[0023] Figure 2 shows a macroscopic view of the magnesium-lithium alloy heat pipe etch treatment in Example 1;

[0024] Figure 3 shows a macroscopic view of the chemical conversion treatment of magnesium-lithium alloy heat pipe in Example 1;

[0025] Figure 4 shows a macroscopic view of the magnesium-lithium alloy heat pipe after welding the liquid filling tube in Example 1.

[0026] Figure 5 shows a microscopic image of the chemical conversion treatment of magnesium-lithium alloy heat pipes in Example 2.

[0027] Figure 6 shows the effect of applying a thermal control and anti-corrosion coating to the surface of the magnesium-lithium alloy heat pipe in Example 2.

[0028] Figure 7 shows a macroscopic view of the magnesium-lithium alloy heat pipe of Comparative Example 1.

[0029] Figure 8 shows a macroscopic view of the magnesium-lithium alloy heat pipe in Comparative Example 2. Detailed Implementation

[0030] This application discloses a magnesium-lithium alloy heat pipe, its surface treatment method, and its application. Those skilled in the art can refer to this document and appropriately modify the process parameters to achieve the desired result. It is particularly important to note that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this application. The products, surface treatment methods, and applications described in this application have been described through preferred embodiments. Those skilled in the art can obviously make modifications or appropriate changes and combinations to the products, surface treatment methods, and applications described herein without departing from the content, spirit, and scope of this application to realize and apply the technology of this application. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0031] It should be noted that, in this document, relational terms such as "first" and "second," "step 1" and "step 2," and "(1)" and "(2)" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Moreover, the embodiments and features described in this application can be combined with each other without conflict.

[0032] In the first aspect of this application, a method for surface treatment of a magnesium-lithium alloy heat pipe is provided, comprising:

[0033] Step 1: Clean the surface of the magnesium-lithium alloy heat pipe;

[0034] Step 2: Use an etching solution to remove oxide scale from the magnesium-lithium alloy heat pipe, clean it, neutralize it with a neutralizing solution, and then clean and dry it; the etching solution includes sodium hexametaphosphate, sodium succinate, ammonium fluoride and hexamethylenetetramine, and the neutralizing solution includes potassium permanganate, tartaric acid and boric acid;

[0035] Step 3: Protect the area of ​​the magnesium-lithium alloy heat pipe to be welded;

[0036] Step 4: Apply a chemical conversion film to the magnesium-lithium alloy heat pipe using an impregnation solution, wherein the impregnation solution includes potassium fluorozirconate, ammonium bifluoride, and sodium perborate.

[0037] Step 5: Clean and dry the magnesium-lithium alloy heat pipe, remove the protection of the area to be welded, and obtain the surface-treated magnesium-lithium alloy heat pipe; see Figure 1 for a schematic diagram of the process.

[0038] In some embodiments of this application, step 1 includes wiping the surface of the magnesium-lithium alloy material with organic solvents such as acetone and ethanol to clean the oil stains on the material surface.

[0039] In some embodiments of this application, the magnesium-lithium alloy includes, but is not limited to, LA103Z magnesium-lithium alloy and LA43M magnesium-lithium alloy.

[0040] In the pretreatment etching solution, sodium hexametaphosphate and sodium succinate serve as the main etching agents, which provide OH- after hydrolysis. - The presence of corrosion agents, phosphate and carboxylate ions, helps stabilize the pH value, making it gentler than conventional sodium hydroxide or potassium hydroxide etching solutions, which is beneficial for slow and uniform corrosion of magnesium-lithium alloys. Ammonium fluoride, as an etching promoter, reacts with oxides on the magnesium-lithium alloy surface, accelerating the etching process. Hexamethylenetetramine, as a surfactant, promotes the release of reaction gases from the magnesium-lithium alloy surface, allowing the reaction to continue. This etching agent effectively etches the surface without causing over-corrosion or excessive roughening, which is beneficial for subsequent welding and other processes.

[0041] In some embodiments of this application, the etching solution comprises 90 g / L to 110 g / L sodium hexametaphosphate, 20 g / L to 30 g / L sodium succinate, 5 g / L to 10 g / L ammonium fluoride, and 1 g / L to 2 g / L hexamethylenetetramine. In other embodiments of this application, the etching solution contains 90 g / L or 110 g / L sodium hexametaphosphate, 20 g / L or 30 g / L sodium succinate, 5 g / L or 10 g / L ammonium fluoride, and 1 g / L or 2 g / L hexamethylenetetramine. In still other embodiments of this application, the etching solution temperature is 60°C to 70°C, and the etching time is 3 min to 5 min.

[0042] In the pretreatment neutralization solution, tartaric acid and boric acid are used to neutralize the alkali produced during the etching process of magnesium-lithium alloys. Their acidity is relatively mild, preventing over-corrosion of the magnesium-lithium alloys and ensuring subsequent welding. Potassium permanganate is used as an oxidant to remove substrate elements that the etching solution cannot react with, resulting in a relatively uniform surface reaction. Conventional neutralization often uses components such as chromic anhydride, which are highly acidic, cause significant corrosion, and result in severe oxidation.

[0043] In some embodiments of this application, the neutralizing solution comprises 10 g / L to 20 g / L potassium permanganate, 15 g / L to 25 g / L tartaric acid, and 5 g / L to 10 g / L boric acid. In other embodiments of this application, the neutralizing solution contains 10 g / L or 20 g / L potassium permanganate, 15 g / L or 25 g / L tartaric acid, and 5 g / L or 10 g / L boric acid. In still other embodiments of this application, the neutralizing solution temperature is 15°C to 35°C, and the neutralization time is 20 s to 40 s.

[0044] In conventional chemical conversion impregnation solutions, sodium fluoride, potassium fluoride, and potassium dichromate are commonly used. While these solutions offer some conversion, the formation of magnesium fluoride from magnesium inhibits further reaction. This application utilizes potassium fluorozirconate and ammonium bifluoride, which, in addition to providing a fluorine source, serve specific purposes. Ammonium bifluoride exhibits foaming agent-like properties, forming a chemical conversion film with microporous structures on the part surface. Zirconium, with its curing properties, facilitates the formation of a network-like microstructure, which is beneficial for subsequent bonding and coating processes. Sodium perborate dissociates into peroxide ions in water, exhibiting strong oxidizing properties that further promote the reaction.

[0045] In some embodiments of this application, the impregnation solution comprises 10 g / L to 20 g / L potassium fluorozirconate, 3 g / L to 5 g / L ammonium bifluoride, and 2 g / L to 4 g / L sodium perborate. In other embodiments of this application, the impregnation solution contains 10 g / L or 20 g / L potassium fluorozirconate, 3 g / L or 5 g / L ammonium bifluoride, and 2 g / L or 4 g / L sodium perborate. In still other embodiments of this application, the temperature of the impregnation solution is 15°C to 30°C, and the impregnation time is 15 min to 20 min.

[0046] In some embodiments of this application, the area to be welded on the magnesium-lithium alloy heat pipe can be protected by a peelable adhesive.

[0047] In the second aspect of this application, a magnesium-lithium alloy heat pipe prepared by the surface treatment method described in this application is provided. Tests were conducted according to the cross-cut test and thermal shock test specifications in QJ479 "Test Method for Bond Strength of Metallic Coatings". After testing, the composite coating showed no peeling, blistering, cracking, or detachment, and the bonding strength met the requirements. Furthermore, X-ray inspection of the welded joint after welding revealed it to be a Class I weld. The area to be painted was treated with anti-corrosion paint. After painting, a high-low temperature thermal cycling shock test was conducted, involving repeated impacts 100 times from liquid nitrogen at -196℃ to a 100℃ high-temperature oven. After the impacts, the surface coating showed good adhesion, with no peeling, blistering, or detachment observed.

[0048] In a third aspect of this application, based on the aforementioned superior technical effects, an application in the manufacture of spacecraft components is provided. In some embodiments of this application, the spacecraft components include optical cameras and laser communication assemblies.

[0049] In a fourth aspect of this application, based on a relevant application, a spacecraft component is also provided, including the magnesium-lithium alloy heat pipe described in this application.

[0050] In the comparative experiments provided in this application, unless otherwise specified, all experimental conditions and materials remain consistent to ensure comparability. Furthermore, all materials used in this application are commercially available.

[0051] The following provides a further description of a magnesium-lithium alloy heat pipe, its surface treatment method, and its application.

[0052] Example 1:

[0053] 1) Wipe the surface of the LA103Z magnesium-lithium alloy heat pipe with organic solvents such as ethanol to clean the oil stains on the material surface;

[0054] 2) The magnesium-lithium alloy heat pipe obtained in step 1) is subjected to descaling treatment, including etching, water washing, neutralization, and water washing.

[0055] The etching solution formulation and operating conditions are as follows:

[0056]

[0057] The neutralization solution formulation and operating conditions are as follows:

[0058]

[0059] 3) Dry the magnesium-lithium alloy heat pipe obtained in step 2) and protect the area to be welded with peelable adhesive.

[0060] 4) The magnesium-lithium alloy heat pipe obtained in step 3) is subjected to chemical conversion coating treatment. The impregnation solution formulation and operating conditions are as follows:

[0061]

[0062]

[0063] After completion, remove the heat pipe from the solution and rinse the surface with water to remove any remaining solution.

[0064] 5) Wash the surface of the part obtained in step 4), dry it, and remove the peelable adhesive to obtain a surface suitable for welding and coating.

[0065] The magnesium-lithium alloy material used in the above surface treatment process was photographed using an optical camera, and the results are shown in Figures 2 and 3. According to the requirements of QJ479 "Test Method for Bond Strength of Metallic Coatings", a thermal shock test was conducted after holding at 220℃ for 1 hour and then immersing in cold water. After the test, the conversion film showed no peeling, blistering, cracking, or detachment. Through cross-cut adhesion testing and thermal shock testing, it can be seen that the obtained film layer meets the requirements for film layer bonding strength in QJ479 "Test Method for Bond Strength of Metallic Coatings" for both cross-cut adhesion and thermal shock testing. The areas to be welded were treated with welding wire and a liquid filling tube, as shown in Figure 4. After welding, the weld joint was inspected by X-ray, and the joint was classified as a Class I weld. The areas to be painted were treated with anti-corrosion paint. After painting, a high-low temperature thermal cycling shock test was conducted, repeatedly impacting the surface coating 100 times from liquid nitrogen at -196℃ to a 100℃ high-temperature oven. After the impact, the surface coating showed good adhesion, with no peeling, blistering, or detachment.

[0066] Example 2:

[0067] 1) Wipe the surface of the LA103Z magnesium-lithium alloy heat pipe with organic solvents such as ethanol to clean the oil stains on the material surface;

[0068] 2) The magnesium-lithium alloy heat pipe obtained in step 1) is subjected to descaling treatment, including etching, water washing, neutralization, and water washing.

[0069] The etching solution formulation and operating conditions are as follows:

[0070]

[0071] The neutralization solution formulation and operating conditions are as follows:

[0072]

[0073] 3) Dry the magnesium-lithium alloy heat pipe obtained in step 2) and protect the area to be welded with peelable adhesive.

[0074] 4) The magnesium-lithium alloy heat pipe obtained in step 3) is subjected to chemical conversion coating treatment. The impregnation solution formulation and operating conditions are as follows:

[0075]

[0076] After completion, remove the heat pipe from the solution and rinse the surface with water to remove any remaining solution.

[0077] 5) Wash the surface of the part obtained in step 4), dry it, and remove the peelable adhesive to obtain a surface suitable for welding and coating.

[0078] The magnesium-lithium alloy material used in the above surface treatment process was analyzed for microstructure using scanning electron microscopy, and the results are shown in Figure 5. According to the requirements of QJ479 "Test Method for Bond Strength of Metallic Coatings", a thermal shock test was conducted after holding at 220℃ for 1 hour and then immersing in cold water. After the test, the conversion film showed no peeling, blistering, cracking, or detachment, as shown in Figure 4. Through cross-cut adhesion testing and thermal shock testing, it can be seen that the obtained conversion film meets the requirements for film bonding strength in QJ479 "Test Method for Bond Strength of Metallic Coatings" for both cross-cut adhesion and thermal shock testing. The areas to be welded were treated with welding wire and a liquid filling tube. After welding, the weld joint was inspected by X-ray, and the joint was classified as a Class I weld. The areas to be painted were treated with anti-corrosion paint. After painting, a high-low temperature thermal cycling shock test was conducted, repeatedly impacting the surface coating 100 times from liquid nitrogen at -196℃ to a 100℃ high-temperature oven. After the impact, the surface coating showed good adhesion, with no peeling, blistering, or detachment, as shown in Figure 6.

[0079] Comparative Example 1:

[0080] The following treatment was performed using LA103Z magnesium-lithium alloy material.

[0081] 1) Wipe the surface of the magnesium-lithium alloy heat pipe with organic solvents such as ethanol to clean the oil stains on the material surface;

[0082] 2) The magnesium-lithium alloy heat pipe obtained in step 1) is subjected to descaling treatment, including etching, water washing, neutralization, and water washing.

[0083] The etching solution formulation and operating conditions are as follows:

[0084]

[0085] The neutralization solution formulation and operating conditions are as follows:

[0086] Chromium trioxide 200g / L

[0087] Solution temperature 25℃

[0088] Duration 1 minute

[0089] 3) Dry the magnesium-lithium alloy heat pipe obtained in step 2) and protect the area to be welded with peelable adhesive.

[0090] 4) The magnesium-lithium alloy heat pipe obtained in step 3) is subjected to chemical conversion coating treatment. The impregnation solution formulation and operating conditions are as follows:

[0091]

[0092] After completion, remove the heat pipe from the solution and rinse the surface with water to remove any remaining solution.

[0093] 5) Wash the surface of the part obtained in step 4), dry it, and remove the peelable adhesive.

[0094] The magnesium-lithium alloy material used in the above surface treatment process was photographed using an optical camera, and the results are shown in Figure 7. Welding was performed on the areas to be welded using welding wire and a liquid filling tube. During welding, the areas to be welded encountered difficulties in achieving full penetration, and porosity appeared in some areas after increasing the welding current. Anti-corrosion paint was applied to the areas to be painted. After painting, a high-low temperature thermal cycling impact test was conducted, repeatedly impacting the surface 100 times from liquid nitrogen at -196℃ to a 100℃ high-temperature oven. After the impact, the edges of the anti-corrosion paint showed peeling.

[0095] Comparative Example 2:

[0096] The following treatment was performed using LA103Z magnesium-lithium alloy material.

[0097] 1) Wipe the surface of the magnesium-lithium alloy heat pipe with organic solvents such as ethanol to clean the oil stains on the material surface;

[0098] 2) The magnesium-lithium alloy heat pipe obtained in step 1) is subjected to descaling treatment, including etching, water washing, neutralization, and water washing.

[0099] The etching solution formulation and operating conditions are as follows:

[0100] Sodium hydroxide 300g / L

[0101] Temperature 70℃

[0102] Time: 15 min

[0103] The neutralization solution formulation and operating conditions are as follows:

[0104] 20 mL / L nitric acid

[0105] Solution temperature 25℃

[0106] Duration 30s

[0107] 3) Dry the magnesium-lithium alloy heat pipe obtained in step 2) and protect the area to be welded with peelable adhesive.

[0108] 4) The magnesium-lithium alloy heat pipe obtained in step 3) is subjected to chemical conversion coating treatment. The impregnation solution formulation and operating conditions are as follows:

[0109]

[0110] After completion, remove the heat pipe from the solution and rinse the surface with water to remove any remaining solution.

[0111] 5) Wash the surface of the part obtained in step 4), dry it, and remove the peelable adhesive.

[0112] The magnesium-lithium alloy material in the above surface treatment process was photographed with an optical camera, and the results are shown in Figure 8. The area to be welded was welded using welding wire and liquid filling tube, and the area to be painted was coated with anti-corrosion paint. After the coating was completed, a high and low temperature thermal cycling impact test was conducted, which involved repeated impacts from liquid nitrogen at -196℃ to a high temperature oven at 100℃ 100 times. After the impact, the edges of the anti-corrosion paint on the surface showed peeling.

[0113] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for surface treatment of a magnesium-lithium alloy heat pipe, characterized in that, include: Step 1: Clean the surface of the magnesium-lithium alloy heat pipe; Step 2: Use an etching solution to remove the oxide scale from the magnesium-lithium alloy heat pipe, clean it, neutralize it with a neutralizing solution, then clean and dry it; The etching solution includes 90g / L~110g / L sodium hexametaphosphate, 20g / L~30g / L sodium succinate, 5g / L~10g / L ammonium fluoride and 1g / L~2g / L hexamethylenetetramine, and the neutralizing solution includes 10g / L~20g / L potassium permanganate and 15g / L~25g / L sodium succinate. Step 3: Protect the area to be welded on the magnesium-lithium alloy heat pipe; Step 4: Apply a chemical conversion film treatment to the magnesium-lithium alloy heat pipe using an impregnation solution comprising 10g / L to 20g / L potassium fluorozirconate, 3g / L to 5g / L ammonium bifluoride, and 2g / L to 4g / L sodium perborate; Step 5: Clean and dry the magnesium-lithium alloy heat pipe, remove the protection from the area to be welded, and obtain the surface-treated magnesium-lithium alloy heat pipe.

2. The magnesium-lithium alloy heat pipe prepared by the surface treatment method according to claim 1.

3. The application of the magnesium-lithium alloy heat pipe according to claim 2 in the manufacture of spacecraft components.

4. The application according to claim 3, characterized in that, The spacecraft components include optical cameras and laser communication components.

5. A spacecraft component, characterized in that, Including the magnesium-lithium alloy heat pipe as described in claim 2.

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