Magnesium alloy and magnesium alloy preparation method

Abstract

The embodiment of the invention provides a magnesium alloy and a magnesium alloy preparation method. The magnesium alloy comprises a magnesium alloy matrix and a composite coating, the composite coating comprises a bonding layer, a texture layer and a coloring layer, and the bonding layer, the texture layer and the coloring layer are sequentially arranged on the surface of the magnesium alloy matrix; wherein the thickness range of the coloring layer is 1-10 [mu] m. The magnesium alloy provided by the embodiment of the invention has a high-texture metallic luster surface.

Description

Technical Field

[0001] The present invention relates to the technical field of surface treatment of magnesium alloys, and more particularly, to a magnesium alloy and a method for preparing the magnesium alloy. Background Art

[0002] Magnesium alloys have low density, high specific strength, and are easy to recycle. They are widely used in the fields of electronic products, vehicles, medical treatment, etc., and can significantly reduce the weight of products. However, due to the low electrode potential and active chemical properties of magnesium alloys, magnesium alloy products are prone to corrosion. At the same time, magnesium alloys have low hardness and poor wear resistance. Therefore, surface treatment of magnesium alloys must be carried out during use to improve their corrosion resistance and wear resistance.

[0003] However, common surface treatment processes for magnesium alloys in the prior art, such as micro-arc oxidation spraying or electrophoresis treatment, although they can meet certain requirements for corrosion resistance and wear resistance, will result in the lack of metallic texture in the appearance of magnesium alloys.

[0004] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the Invention

[0005] An object of the present invention is to provide a new technical solution for a magnesium alloy and a method for preparing the magnesium alloy.

[0006] According to a first aspect of the present invention, there is provided a magnesium alloy, wherein the magnesium alloy comprises:

[0007] A magnesium alloy substrate;

[0008] A composite coating, the composite coating comprising a bonding layer, a texture layer, and a coloring layer, and the bonding layer, the texture layer, and the coloring layer are sequentially disposed on the surface of the magnesium alloy substrate;

[0009] Wherein, the thickness range of the coloring layer is 1-10 μm.

[0010] Optionally, the thickness range of the bonding layer is 1-10 μm, and the thickness range of the texture layer is 3-15 μm.

[0011] Optionally, the material of the bonding layer is MgO.

[0012] Optionally, the material of the texture layer comprises at least one of metal materials Cu, Al, Ti, Zn, Sn, Cr, and alloys formed by the metal materials.

[0013] Optionally, the material of the coloring layer comprises at least one of TiN, TiNC, CrN, VN, SiO2, Al2O3, and AlN.

[0014] Optionally, the composite coating further includes a sealing layer disposed on a side of the coloring layer away from the texture layer, and the thickness of the sealing layer ranges from 0.1 to 2 μm.

[0015] Optionally, the sealing layer is PTFE or PFPE.

[0016] According to a second aspect of the present invention, there is provided a method for preparing a magnesium alloy, wherein the preparation method includes:

[0017] Providing a bonding layer on the surface of a magnesium alloy substrate;

[0018] Providing a texture layer on a side of the bonding layer away from the magnesium alloy substrate;

[0019] Providing a coloring layer on a side of the texture layer away from the bonding layer.

[0020] Optionally, after providing the coloring layer on the surface of the texture layer, a sealing layer is provided on a side of the coloring layer away from the texture layer.

[0021] Optionally, a bonding layer is deposited on the surface of the magnesium alloy substrate by chemical vapor deposition process or atomic layer deposition process.

[0022] Optionally, a texture layer is deposited on a side of the bonding layer away from the magnesium alloy by physical vapor deposition process.

[0023] Optionally, after providing a texture layer on a side of the bonding layer away from the magnesium alloy, the surface of the texture layer is textured by laser engraving process.

[0024] According to an embodiment of the present invention, a magnesium alloy includes a magnesium alloy substrate and a composite coating. The composite coating includes a bonding layer, a texture layer, and a coloring layer. The bonding layer, the texture layer, and the coloring layer are sequentially provided on the surface of the magnesium alloy substrate. Wherein, the thickness of the coloring layer ranges from 1 to 10 μm. By providing the bonding layer, the texture layer, and the coloring layer, the magnesium alloy can have a high-quality metallic luster surface.

[0025] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings incorporated in and constituting a part of this specification illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0027] Figure 1 is a schematic structural diagram of the magnesium alloy of the present invention.

[0028] Figure 2 It is a schematic structural diagram of the composite coating of the magnesium alloy of the present invention.

[0029] Figure 3 It is a flow chart of the preparation method of the magnesium alloy of the present invention.

[0030] Description of the reference numerals:

[0031] 11. Magnesium alloy substrate; 12. Composite coating; 121. Bonding layer; 122. Texture layer; 123. Coloring layer; 124. Sealing layer. Detailed implementation manners

[0032] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0033] The embodiments of the present application will be described in detail below, and the examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0034] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0035] According to an embodiment of the present application, a magnesium alloy is provided. Refer to Figure 1 and Figure 2 , the magnesium alloy includes a magnesium alloy substrate 11 and a composite coating 12, the composite coating 12 includes a bonding layer 121, a texture layer 122, and a coloring layer 123, and the bonding layer 121, the texture layer 122, and the coloring layer 123 are sequentially arranged on the surface of the magnesium alloy substrate 11; wherein, the thickness range of the coloring layer 123 is 1-10 μm.

[0036] Specifically, as Figure 1As shown in the figure, in the embodiment of the present application, a composite coating 12 is provided on the surface of the magnesium alloy substrate 11. The composite coating 12 includes a bonding layer 121, a texture layer 122, and a coloring layer 123 that are sequentially stacked. The bonding layer 121 can improve the bonding force between the texture layer 122 and the magnesium alloy substrate 11, prevent the texture layer 122 from peeling off the surface of the magnesium alloy substrate 11, and further, the bonding layer 121 can also seal the surface of the magnesium alloy substrate 11, so that the formed magnesium alloy has high corrosion resistance. The texture layer 122 can form a high gloss and a special texture effect to meet the special appearance requirements of the magnesium alloy product. The coloring layer 123 can provide a rich color effect.

[0037] Thus, as Figure 2 shown in the figure, by utilizing the synergistic effect between the layers of the composite coating 12 in the embodiment of the present application, a high-quality metallic luster effect can be achieved on the surface of the magnesium alloy substrate 11.

[0038] In addition, the synergistic effect between the layers of the composite coating 12 can also effectively improve the corrosion resistance and wear resistance of the magnesium alloy substrate 11, so that the magnesium alloy has excellent corrosion resistance and wear resistance.

[0039] Among them, the thickness range of the coloring layer 123 is 1 - 10 μm, so as to form an appearance with a more rich color effect on the surface of the magnesium alloy. For example, when the thickness of the coloring layer 123 is 5 μm, a high-quality blue metallic luster can be presented on the surface of the magnesium alloy.

[0040] Furthermore, each layer of the composite coating 12 in the embodiment of the present application is formed by a deposition process. Compared with the magnesium alloy surface treatment processes commonly used in the prior art, it will not increase the weight of the magnesium alloy, so that the overall weight of the magnesium alloy in the embodiment of the present application is smaller, which can further meet the requirements of low weight for electronic products.

[0041] In addition, the magnesium alloy substrate 11 in the embodiment of the present application can be plate-shaped, strip-shaped or block-shaped. For example, when the magnesium alloy substrate 11 is plate-shaped, the magnesium alloy substrate 11 can be a flat plate, an arc plate or other plate bodies. Of course, those skilled in the art can also make selections according to actual needs, and the present application does not make specific limitations here.

[0042] Optionally, the thickness range of the bonding layer 121 is 1 - 10 μm, and the thickness range of the texture layer 122 is 3 - 15 μm.

[0043] Specifically, when the thickness of the bonding layer 121 is less than 1 μm, the bonding force of the bonding layer 121 will be poor, and it cannot effectively attach the texture layer 122 to the surface of the magnesium alloy substrate 11. Moreover, when the thickness of the bonding layer 121 is less than 1 μm, the bonding layer 121 cannot seal the surface of the magnesium alloy substrate 11, thereby resulting in poor corrosion resistance and wear resistance of the magnesium alloy. When the thickness of the bonding layer 121 is greater than 10 μm, the lightweight effect of the magnesium alloy will be sacrificed.

[0044] Therefore, when the thickness range of the bonding layer 121 is 1 - 10 μm, the bonding force of the bonding layer 121 can be ensured, so that the texture layer 122 can be firmly attached to the surface of the magnesium alloy substrate 11, and it can be ensured that the bonding layer 121 seals the surface of the magnesium alloy substrate 11 without increasing the weight of the magnesium alloy.

[0045] In addition, when the thickness of the texture layer 122 is less than 3 μm, it will result in an inability to obtain the desired gloss and special texture effect after texturing the texture layer 122. When the thickness of the texture layer 122 is greater than 15 μm, since the texture layer 122 is mainly composed of metal or alloy materials, the overall density of the texture layer 122 will be relatively high, thereby sacrificing the lightweight effect of the magnesium alloy.

[0046] Therefore, when the thickness range of the texture layer 122 is 3 - 15 μm, it can be ensured that the texture layer 122 obtains the desired gloss and special texture effect without increasing the weight of the magnesium alloy.

[0047] Optionally, the material of the bonding layer 121 is MgO.

[0048] Specifically, due to the advantages of MgO such as low density, high temperature resistance, high insulation, excellent mechanical properties, and good chemical stability, using MgO as the bonding layer 121 of the composite coating 12 can effectively seal the surface of the magnesium alloy substrate 11, thereby significantly enhancing the corrosion resistance of the magnesium alloy.

[0049] Optionally, the material of the texture layer includes at least one of metal materials Cu, Al, Ti, Zn, Sn, Cr, alloys formed by these metal materials themselves and other materials, or alloys formed by combining these metal materials.

[0050] Specifically, since metal materials such as Cu, Al, Ti, Zn, Sn, and Cr have excellent appearance properties, for example, Cu has a reddish-orange metallic luster, and Ti can present a variety of different colors such as light yellow, golden yellow, blue, and purple depending on the thickness of the surface oxide film, the deposited texture layer 122 can meet the higher gloss and special texture effect required by the magnesium alloy surface.

[0051] Optionally, the texture layer can be made of a single metal material such as Cu, Al, Ti, Zn, Sn, or Cr. It can also be made of alloys of these metal materials, such as aluminum-magnesium alloy, copper-nickel alloy, etc. Alternatively, it can also be an alloy formed between the above metal materials Cu, Al, Ti, Zn, Sn, and Cr, such as copper-tin alloy, copper-aluminum alloy, etc. Furthermore, the texture layer can also be formed in the form of a mixture of multiple alloys.

[0052] Preferably, the texture layer 122 is Al or aluminum alloy.

[0053] Specifically, since the surface of pure aluminum is silvery white and relatively bright, and the aluminum alloy can present different colors and textures after being processed, such as oxidation, coloring or coating, to change its appearance, so using aluminum or aluminum alloy as the texture layer 122 of the magnesium alloy can better meet the higher glossiness and special texture effect required by the magnesium alloy surface.

[0054] Optionally, the material of the coloring layer 123 includes at least one of TiN, TiNC, CrN, VN, SiO2, Al2O3 and AlN.

[0055] Specifically, since ceramic materials such as TiN, TiNC, CrN and VN can directly apply certain color effects, and SiO2, Al2O3 and AlN are transparent compounds that can improve the glossiness of the texture layer 122, the use of materials such as TiN, TiNC, CrN, VN, SiO2, Al2O3 and AlN can better change the color effect or glossiness of the magnesium alloy surface, and it is also convenient to use interference methods to make the magnesium alloy surface obtain richer color effects or high-quality metallic luster.

[0056] Preferably, the coloring layer 123 is TiN.

[0057] Specifically, since TiN has a stable structure and does not react with magnesium at high temperatures, it has higher stability and reliability when coloring magnesium alloys, thereby enabling the surface of the magnesium alloy to obtain a richer color effect.

[0058] Optionally, the composite coating further includes a sealing layer 124 disposed on a side of the coloring layer 123 away from the texture layer 122, and the thickness of the sealing layer 124 ranges from 0.1 to 2 μm.

[0059] Specifically, in the embodiment of the present application, by providing the sealing layer 124, the micropores on the surface of the coloring layer 123 can be sealed, so as to further improve the color fastness of the color on the surface of the magnesium alloy, and enable the magnesium alloy to have higher corrosion resistance and wear resistance.

[0060] Among them, when the thickness of the sealing layer 124 is less than 0.1 μm, the micropores on the surface of the coloring layer 123 cannot be sealed, and the color fastness of the color on the surface of the magnesium alloy is poor. When the thickness of the sealing layer 124 is greater than 2 μm, the gloss of the surface of the magnesium alloy will be affected, making it impossible to form a high-quality metallic luster surface. Therefore, preferably, the thickness of the sealing layer 124 ranges from 0.1 to 2 μm.

[0061] Optionally, the sealing layer 124 is PTFE (Polytetrafluoroethylene) or PFPE (Perfluoropolyethers).

[0062] Specifically, since PTFE and PFPE have excellent corrosion resistance and high wear resistance, for example, they are still very stable in environments with strong corrosive acids, alkalis, oxidants, etc., or in relatively harsh environmental conditions such as high temperature, low temperature, and anti-sticking where conventional materials cannot be used. Therefore, using PTFE and PFPE as the sealing layer 124 of the magnesium alloy can further improve the corrosion resistance and wear resistance of the magnesium alloy.

[0063] In addition, when the sealing layer 124 is PTFE and PFPE, the micropores on the surface of the coloring layer 123 deposited with materials such as TiN, TiNC, CrN, VN, SiO2, Al2O3, and AlN can also be sealed, so as to further improve the color fastness of the coloring layer 123, and thus significantly enhance the high-quality metallic luster effect on the surface of the magnesium alloy.

[0064] According to another embodiment of the present application, a method for preparing a magnesium alloy is provided, as Figure 3 shown, including the following steps S1 to S3:

[0065] S1, providing a bonding layer 121 on the surface of a magnesium alloy substrate 11;

[0066] S2, providing a texture layer 122 on a side of the bonding layer 121 away from the magnesium alloy substrate 11;

[0067] S3. On the side of the texture layer 122 away from the bonding layer 121, a coloring layer 123 is provided.

[0068] Specifically, the magnesium alloy prepared by the above magnesium alloy preparation method in the embodiments of the present application has more excellent corrosion resistance and wear resistance compared with common magnesium alloy surface treatment processes in the prior art, such as micro-arc oxidation spraying or electrophoresis treatment, and has a metallic luster surface with high texture.

[0069] Optionally, before step S1, the magnesium alloy substrate 11 can also be processed through the following steps:

[0070] S01. Perform a first pretreatment on the magnesium alloy substrate 11.

[0071] Specifically, in the embodiments of the present application, by performing a first pretreatment on the magnesium alloy substrate 11, the oil stains and impurities on the surface of the magnesium alloy can be removed.

[0072] Optionally, after step S1 and before step S2, the bonding layer 121 can also be processed through the following steps:

[0073] S11. Perform a second pretreatment on the bonding layer 121.

[0074] Specifically, in the embodiments of the present application, by performing a second pretreatment on the bonding layer 121, the impurities generated when setting the bonding layer 121 can be removed.

[0075] Optionally, the first pretreatment and the second pretreatment are at least one of mechanical treatment or chemical treatment.

[0076] Specifically, the mechanical treatment in the embodiments of the present application includes grinding, wiping, impregnation, spraying, steaming, ultrasonic wave, etc., and the chemical treatment includes chemical degreasing, chemical alkali washing, chemical acid washing, neutralization rust removal, sludge stripping, etc.

[0077] Preferably, the mechanical treatment is grinding or wiping.

[0078] Specifically, when the mechanical treatment is grinding, various foreign substances attached to the surface of the magnesium alloy substrate 11 or the surface of the bonding layer 121, such as oil stains, rust, dust, etc., can be ground off, thereby significantly improving the flatness and smoothness of the surface of the magnesium alloy substrate 11 and facilitating the subsequent deposition of the bonding layer 121 or the texture layer 122; when the mechanical treatment is wiping, various foreign substances attached to the surface of the magnesium alloy substrate 11 or the surface of the bonding layer 121, such as undissolved substances, substances that have dried on the material surface, substances with very low solubility, etc., can be wiped off by a specially treated wiping cloth, which is convenient for treating some special structures, such as curved surfaces and deep grooves, which are not easy to grind.

[0079] Of course, in the embodiment of the present application, the magnesium alloy substrate 11 can also be pretreated by grinding first and then by wiping; or, the magnesium alloy substrate 11 can be pretreated by wiping first and then by grinding. Those skilled in the art can also make a choice according to actual needs, and the present application does not make specific limitations here.

[0080] Preferably, the chemical treatment is chemical degreasing or chemical alkali washing.

[0081] Specifically, when the chemical treatment is chemical degreasing, through the saponification, solubilization, wetting, dispersion, emulsification, etc. of the degreasing agent on various oils and fats, the oils and fats can be detached from the surface of the workpiece, becoming soluble substances, or being emulsified and uniformly and stably dispersed in the bath liquid, so that no oils and fats are attached to the surface of the magnesium alloy substrate 11 or the surface of the bonding layer 121, facilitating the subsequent deposition of the bonding layer 121 or the texture layer 122; when the chemical treatment is chemical alkali washing, a high-strength alkali solution prepared from sodium hydroxide and sodium carbonate or trisodium phosphate can be used to soften, loosen, emulsify and disperse the deposits on the surface of the magnesium alloy substrate 11 or the surface of the bonding layer 121, so as to better remove the deposits and facilitate the subsequent deposition of the bonding layer 121 or the texture layer 122.

[0082] Of course, in the embodiment of the present application, the magnesium alloy substrate 11 can also be pretreated by chemical degreasing first and then by chemical alkali washing; or, the magnesium alloy substrate 11 can be pretreated by chemical alkali washing first and then by chemical degreasing. Those skilled in the art can also make a choice according to actual needs, and the present application does not make specific limitations here.

[0083] In addition, in the embodiments of the present application, the magnesium alloy substrate 11 may also be pretreated by mechanical physics first and then by chemical treatment; or, the magnesium alloy substrate 11 may be pretreated by chemical treatment first and then by mechanical treatment.

[0084] Optionally, after step S3, the colored layer 123 may be further processed through the following steps:

[0085] S4, a sealing layer 124 is provided on the side of the colored layer 123 away from the texture layer 122.

[0086] Specifically, in the embodiments of the present application, by providing the sealing layer 124 on the side of the colored layer 123 away from the texture layer 122, the micropores on the surface of the colored layer 123 can be sealed, so as to further improve the color fastness of the color on the surface of the magnesium alloy, and make the magnesium alloy have higher corrosion resistance and wear resistance.

[0087] Optionally, a bonding layer 121 is deposited on the surface of the magnesium alloy substrate 11 by using a Chemical Vapor Deposition (CVD) process or an Atomic Layer Deposition (ALD) process.

[0088] Specifically, the chemical vapor deposition process in the embodiments of the present application is a process technology that uses methods such as plasma excitation and heating to cause reactants to undergo a chemical reaction under certain temperature and gaseous conditions, and deposit the generated solid substances on the surface of a substrate at an appropriate position, thereby obtaining a solid thin film or coating. Among them, the deposited substances are usually atoms, molecules, or a combination of both. Therefore, when the deposition process of the bonding layer 121 is a chemical vapor deposition process, due to the high deposition rate and deposition uniformity of the chemical vapor deposition process, and the deposition thickness can be precisely controlled, the bonding layer 121 with higher uniformity and quality can be prepared by depositing the bonding layer 121 using the chemical vapor deposition process.

[0089] In addition, the atomic layer deposition process in the embodiments of the present application refers to a method in which gaseous precursors are alternately pulsed into a reaction chamber and a gas-solid phase chemical adsorption reaction occurs on the surface of a deposition substrate to form a thin film. Therefore, when the deposition process of the bonding layer 121 is an atomic layer deposition process, since the atomic layer deposition process deposits in units of atoms, very thin films can be precisely controlled, and the impurity content is low. Therefore, by depositing the bonding layer 121 using the atomic layer deposition process, the quality and structural uniformity of the bonding layer 121 can be effectively ensured.

[0090] Of course, in the embodiments of the present application, the bonding layer 121 may also be deposited by an anodic oxidation process, a micro-arc oxidation process, or a magnetron sputtering process. Those skilled in the art may also make a selection according to actual needs, and the present application does not make specific limitations here.

[0091] Optionally, a texture layer 122 is deposited on the side of the bonding layer 121 away from the magnesium alloy substrate 11 by a Physical Vapor Deposition (PVD) process.

[0092] Specifically, the physical vapor deposition process in the embodiments of the present application is a process of condensing on a substrate in a vacuum environment by using physical vapor methods such as sputtering or evaporation to form a coating. Among them, the main methods of the physical vapor deposition process include sputtering coating, vacuum evaporation coating, arc, hollow cathode, and reactive plasma coating. Therefore, when the deposition process of the texture layer 122 is a physical vapor deposition process, since the film prepared by the physical vapor deposition process has advantages such as high hardness and strength, good thermal stability, good wear resistance, stable chemical properties, low friction coefficient, and dense tissue structure, the corrosion resistance and wear resistance of the magnesium alloy can be significantly improved.

[0093] Of course, in the embodiments of the present application, the texture layer 122 may also be deposited by an electroplating process. Those skilled in the art may also make a selection according to actual needs, and the present application does not make specific limitations here.

[0094] Optionally, after step S2, the texture layer 122 may be textured by the following steps:

[0095] S21, the texture layer 122 is textured by a laser engraving process.

[0096] Specifically, by texturing the texture layer 122 by the laser engraving process in the embodiments of the present application, the texture layer 122 can have a certain reflective effect, luster, and special texture appearance effect, so as to meet the requirement that the magnesium alloy product has a high-quality metallic luster surface.

[0097] Of course, in the embodiments of the present application, the texture layer 122 may also be textured by a chemical process or an electrochemical process. Those skilled in the art may also make a selection according to actual needs, and the present application does not make specific limitations here.

[0098] In the above embodiments, the differences between the embodiments are mainly described. As long as the different optimization features between the embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, it will not be elaborated here.

[0099] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for illustration purposes and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A magnesium alloy, characterized in that, Comprising: A magnesium alloy substrate; A composite coating, the composite coating comprising a bonding layer, a texture layer, and a coloring layer, the bonding layer, the texture layer, and the coloring layer being sequentially disposed on the surface of the magnesium alloy substrate; Wherein, the thickness range of the coloring layer is 1 to 10 μm.

2. The magnesium alloy according to claim 1, characterized in that, The thickness range of the bonding layer is 1 to 10 μm, and the thickness range of the texture layer is 3 to 15 μm.

3. The magnesium alloy according to claim 1, characterized in that, The material of the bonding layer is MgO.

4. The magnesium alloy according to claim 1, characterized in that, The material of the texture layer includes at least one of the metal materials Cu, Al, Ti, Zn, Sn, Cr, and alloys formed by the metal materials.

5. The magnesium alloy according to claim 1, wherein The material of the coloring layer includes at least one of TiN, TiNC, CrN, VN, SiO2, Al2O3, and AlN.

6. The magnesium alloy according to claim 1, wherein The composite coating further includes a sealing layer, the sealing layer being disposed on the side of the coloring layer away from the texture layer, and the thickness range of the sealing layer is 0.1 to 2 μm.

7. The magnesium alloy according to claim 6, characterized in that, The material of the sealing layer is PTFE or PFPE.

8. A method for preparing a magnesium alloy, characterized in that, The preparation method includes: Setting a bonding layer on the surface of the magnesium alloy substrate; Setting a texture layer on the side of the bonding layer away from the magnesium alloy substrate; Setting a coloring layer on the side of the texture layer away from the bonding layer.

9. The preparation method of the magnesium alloy according to claim 8, characterized in that, After setting the coloring layer on the surface of the texture layer, setting a sealing layer on the side of the coloring layer away from the texture layer.

10. The preparation method of the magnesium alloy according to claim 8, characterized in that, Depositing the bonding layer on the surface of the magnesium alloy substrate by chemical vapor deposition process or atomic layer deposition process.

11. The preparation method of the magnesium alloy according to claim 8, wherein, Depositing the texture layer on the side of the bonding layer away from the magnesium alloy by physical vapor deposition process.

12. The preparation method of the magnesium alloy according to claim 8, characterized in that, After setting the texture layer on the side of the bonding layer away from the magnesium alloy, performing texturing treatment on the surface of the texture layer by laser engraving process.

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