Titanium alloy surface photo-thermal super-hydrophobic bifunctional coating and preparation method thereof

Abstract

The invention provides a titanium alloy surface photo-thermal super-hydrophobic dual-function coating and a preparation method thereof. The preparation method comprises the steps that the titanium alloy surface is pretreated; a micro-arc oxidation layer is generated on the pretreated surface in situ; and a soot deposition layer is deposited on the surface of the micro-arc oxidation layer in situ. According to the titanium alloy surface photo-thermal super-hydrophobic dual-function coating and the preparation method thereof, the micro-arc oxidation film layer is formed on the titanium alloy surface firstly, then the soot deposition layer is deposited on the surface of the micro-arc oxidation film layer, and therefore the composite coating with the photo-thermal effect and the super-hydrophobic function is formed on the titanium alloy surface; and the titanium alloy is endowed with a photo-thermal effect and a super-hydrophobic function, so that the photo-thermal deicing effect is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of titanium alloy surface treatment, and in particular relates to a titanium alloy surface photothermal super-hydrophobic dual-function coating and a preparation method thereof. Background Art

[0002] Titanium alloy is a material with high specific strength, good heat resistance and mechanical stability. It is light in weight and can be used in marine, aerospace and other environments. Due to its excellent performance, it has received widespread attention from all over the world. For marine titanium alloy materials, during service, due to the presence of surrounding water vapor and the interaction between waves and aircraft, water will adhere to the surface of titanium alloy. In a relatively low temperature environment, it will cause equipment to freeze, resulting in reduced equipment performance and operating efficiency, which will harm economic development. The deicing strategies generally adopted are mechanical deicing and chemical deicing. Among them, mechanical deicing methods will waste manpower, material resources and energy; chemical deicing methods usually use chemical agents to spray on ice to achieve the purpose of melting, but chemical agents often harm the environment and are discharged into the seawater directly or indirectly, affecting people's health.

[0003] Researchers have found that super-hydrophobic surfaces have potential application prospects in the field of anti-icing. However, if the surface is exposed to low temperature and high humidity for a long time, it will eventually fail and ice will form on the surface. If de-icing is performed by external force, the surface structure and chemical properties will be destroyed. Therefore, it is particularly important to give the super-hydrophobic surface an autonomous de-icing function. Solar energy is a clean energy source, and the strategy of using solar energy to melt ice is an economical and efficient method. Therefore, by introducing photothermal conversion materials on the super-hydrophobic surface, it can be used to absorb solar energy and convert it into thermal energy to heat the surface, which can achieve the dual purposes of anti-icing and de-icing.

[0004] Carbon nanomaterials have the ability to absorb sunlight in a wide spectral range and are potential photothermal conversion materials. For example, carbon nanotubes and graphene have excellent photothermal effects. However, such nanomaterials have disadvantages such as difficulty in preparation and high prices. The soot deposition layer can be obtained by incomplete combustion of the flame. The carbon nanomaterials obtained by this method have the advantages of simple preparation, easy acquisition of particles, and the same photothermal effect as the above-mentioned nanomaterials. It has been reported that by directly depositing soot on materials such as aluminum alloys, glass, and stainless steel, a coating surface with photothermal and super-hydrophobic properties can be obtained. However, by directly depositing soot on the surface of titanium alloys using the same method, the resulting titanium alloy samples do not have super-hydrophobicity. Summary of the invention

[0005] Based on solving the technical problems existing in the background technology, the present invention proposes a photothermal and super-hydrophobic dual-functional coating on the surface of a titanium alloy and a preparation method thereof. A micro-arc oxidation film layer is first formed on the surface of the titanium alloy, and then a soot deposition layer is deposited on the surface of the micro-arc oxidation film layer. In this way, a composite coating with both photothermal effect and super-hydrophobic function is formed on the surface of the titanium alloy, giving the titanium alloy photothermal effect and super-hydrophobic function, thereby achieving the effect of photothermal deicing.

[0006] The present invention provides a method for preparing a photothermal super-hydrophobic dual-functional coating on a titanium alloy surface, comprising the following steps:

[0007] S1, titanium alloy surface pretreatment;

[0008] S2, in-situ generation of a micro-arc oxidation layer on the pre-treated surface;

[0009] S3, in-situ deposition of soot deposits on the surface of the micro-arc oxidation layer;

[0010] S4. A silicon dioxide layer is vapor deposited on the surface of the soot deposition layer.

[0011] Preferably, in step S1, the “titanium alloy surface pretreatment” specifically includes: grinding the titanium alloy surface with 400-2000 mesh sandpaper, and then washing and degreasing;

[0012] Preferably, the titanium alloy is TC4 titanium alloy, TA1 titanium alloy, TA2 titanium alloy or TA3 titanium alloy.

[0013] Preferably, in step S2, the “in-situ generation of a micro-arc oxidation layer” specifically includes: using the titanium alloy as an anode and the stainless steel tank as a cathode, performing micro-arc oxidation treatment in an electrolyte, and forming a micro-arc oxidation layer on the pretreated surface of the titanium alloy;

[0014] Preferably, the parameters of the micro-arc oxidation treatment include: positive voltage of 300-450V, negative voltage of 0-30V, duty cycle of 10-30%, power frequency of 300-1000Hz, oxidation time of 5-25min, and electrolyte temperature below 50°C.

[0015] Preferably, the electrolyte is an aqueous solution comprising sodium silicate, sodium hexametaphosphate, potassium hydroxide and sodium metavanadate;

[0016] Preferably, the mass ratio of sodium silicate, sodium hexametaphosphate, potassium hydroxide and sodium metavanadate is 15:5-15:1-3:4-6;

[0017] Preferably, the concentration of sodium silicate is 10-20 g / L.

[0018] Preferably, in step S3, the “in-situ deposition of a soot layer” specifically comprises: placing the titanium alloy above the flame of an alcohol lamp, moving the titanium alloy, and depositing a soot deposition layer on the surface of the titanium alloy micro-arc oxidation layer;

[0019] Preferably, the titanium alloy is placed 1-1.5 cm from the center of the flame of the alcohol lamp;

[0020] Preferably, the deposition time is 1-2 min.

[0021] Preferably, the method further comprises step S4, vapor-depositing a silicon dioxide layer on the surface of the soot deposition layer;

[0022] Preferably, in step S4, the "vapor-deposited silicon dioxide layer" specifically includes: placing the titanium alloy in a sealed container, adding ethyl orthosilicate and ammonia water, and depositing a silicon dioxide layer on the surface of the titanium alloy soot deposition layer after volatilization.

[0023] Preferably, the method further comprises step S5, modifying the surface of the silicon dioxide layer with a low surface energy compound.

[0024] Preferably, in step S5, the “modifying the low surface energy compound” specifically comprises: immersing the titanium alloy in a FAS-17 ethanol solution, and grafting FAS-17 on the surface of the titanium alloy silicon dioxide layer;

[0025] Preferably, the soaking time is 2-12 hours.

[0026] The present invention also proposes a photothermal super-hydrophobic dual-functional coating on the surface of a titanium alloy, which is prepared by the above-mentioned preparation method.

[0027] The present invention also proposes an application of the above-mentioned titanium alloy surface photothermal super-hydrophobic dual-functional coating in photothermal deicing.

[0028] Beneficial effects of the present invention:

[0029] The present invention generates a micro-arc oxidation layer in situ on the surface of the titanium alloy through micro-arc oxidation, then deposits a soot deposition layer on the micro-arc oxidation film layer, and deposits a silicon dioxide layer on the surface of the soot deposition layer through vapor deposition, so that the soot deposition layer can be given certain mechanical stability and super-hydrophobic properties without destroying the microscopic morphology; since there are still more hydrophilic groups on the surface of the titanium alloy obtained at this time, the surface of the titanium alloy has hydrophilicity, and then through low surface energy modification, based on the hydrolysis of FAS17 by ethanol organic solution, its hydrophobic groups react chemically with the hydroxyl groups on the silicon dioxide layer after vapor deposition, and then the hydrophobic groups can be grafted on the surface of the soot deposition layer, thereby further improving the hydrophobic properties.

[0030] The present invention generates a micro-arc oxidation layer in situ on the surface of a titanium alloy through micro-arc oxidation. The micro-arc oxidation layer does not have a superior photothermal effect due to the influence of the composition. However, the soot generated by the incomplete combustion of an alcohol lamp is a carbon nanomaterial, and its coral-like carbon nanoparticle distribution can capture more light, so that the light is reflected and refracted multiple times, which is beneficial for the carbon nanomaterial to absorb more light and convert it into heat energy. Therefore, through this method, the micro-arc oxidation composite film layer can have a photothermal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a SEM image of the photothermal super-hydrophobic dual-functional coating on the titanium alloy surface described in Example 1;

[0032] Figure 2 This is a SEM image of the photothermal super-hydrophobic dual-functional coating on the titanium alloy surface described in Comparative Example 1;

[0033] Figure 3 This is a thermal image of the photothermal super-hydrophobic dual-function coating on the titanium alloy surface described in Example 1 irradiated under 1.5 Sun for 10 minutes;

[0034] Figure 4 This is a thermal image of the photothermal super-hydrophobic dual-function coating on the titanium alloy surface described in Comparative Example 1 after irradiation for 10 minutes under 1.5 Sun;

[0035] Figure 5 This is a contact angle diagram of the photothermal super-hydrophobic dual-functional coating on the titanium alloy surface described in Example 1;

[0036] Figure 6 This is the contact angle diagram of the photothermal super-hydrophobic dual-functional coating on the titanium alloy surface described in Comparative Example 2. DETAILED DESCRIPTION

[0037] Example 1

[0038] This embodiment provides a method for preparing a photothermal super-hydrophobic dual-function coating on a titanium alloy surface, comprising the following steps:

[0039] (1) using a wire cutting machine to cut a TC4 titanium alloy plate of 100 mm × 100 mm × 2 mm into a size of 20 mm × 20 mm × 2 mm, using SiC sandpaper to grind the cut titanium alloy in steps of 400 mesh, 800 mesh, 1200 mesh, and 2000 mesh, rinsing with deionized water, and then placing it in an acetone solution for ultrasonic cleaning and degreasing to obtain a pretreated titanium alloy;

[0040] (2) 15 g of sodium silicate, 10 g of sodium hexametaphosphate, 2 g of potassium hydroxide and 5 g of sodium metavanadate were dissolved in 1 L of deionized water, and after being fully dissolved, they were added to a stainless steel tank as an electrolyte, the stainless steel tank was used as a cathode, the above-mentioned pretreated titanium alloy was used as an anode, and micro-arc oxidation treatment was performed using FL7-MAO30G micro-arc oxidation power supply equipment. The electrical parameters of the micro-arc oxidation treatment included: constant voltage mode, positive voltage of 375 V, negative voltage of 15 V, duty cycle of 20%, power frequency of 600 Hz, oxidation time of 10 min, and the temperature of the micro-arc oxidation reaction electrolyte was kept below 50° C. After the end, it was rinsed with distilled water and dried, and a micro-arc oxidation layer was formed on the pretreated surface of the titanium alloy to obtain a titanium alloy with a micro-arc oxidation layer on the surface;

[0041] (3) Lighting an alcohol lamp, after the alcohol lamp burns stably, placing the titanium alloy having the micro-arc oxidation layer on the surface above the flame of the alcohol lamp, with the surface of the titanium alloy having the micro-arc oxidation layer 1 cm away from the flame center, depositing for 1 min by a cross-movement method, and evenly distributing a layer of soot deposition layer on the micro-arc oxidation layer of the titanium alloy to obtain a titanium alloy having a soot deposition layer on the surface;

[0042] (4) Wipe the desiccator clean with alcohol and keep it dry. After ensuring that there is no moisture in the desiccator, place the titanium alloy with the soot deposition layer on the surface in the center of the desiccator, use a dropper to measure 2 mL of tetraethyl orthosilicate (TEOS) and 2 mL of ammonia water, respectively, and place them in open beakers, respectively. Place the beakers in the desiccators, apply vaseline to the mouth of the desiccator and seal it. After sealing for 24 hours, take it out and deposit a layer of silicon dioxide on the surface of the titanium alloy soot deposition layer to obtain a titanium alloy with a silicon dioxide layer;

[0043] (5) The titanium alloy with the silica layer is immersed in a 1 wt% FAS-17 ethanol solution for 6 hours, and then taken out and dried in a tube furnace for 2 hours. FAS-17 is grafted onto the surface of the silica layer of the titanium alloy to obtain a photothermal super-hydrophobic dual-functional coating on the titanium alloy surface.

[0044] Example 2

[0045] This embodiment provides a method for preparing a photothermal super-hydrophobic dual-function coating on a titanium alloy surface, comprising the following steps:

[0046] (1) using a wire cutting machine to cut a TC4 titanium alloy plate of 100 mm × 100 mm × 2 mm into a size of 20 mm × 20 mm × 2 mm, using SiC sandpaper to grind the cut titanium alloy in steps of 400 mesh, 800 mesh, 1200 mesh, and 2000 mesh, rinsing with deionized water, and then placing it in an acetone solution for ultrasonic cleaning and degreasing to obtain a pretreated titanium alloy;

[0047] (2) 15 g of sodium silicate, 10 g of sodium hexametaphosphate, 2 g of potassium hydroxide and 5 g of sodium metavanadate were dissolved in 1 L of deionized water, and after being fully dissolved, they were added to a stainless steel tank as an electrolyte, with the stainless steel tank as the cathode and the pretreated titanium alloy as the anode, and micro-arc oxidation treatment was performed using FL7-MAO30G micro-arc oxidation power supply equipment. The electrical parameters of the micro-arc oxidation treatment included: constant voltage mode, positive voltage of 300 V, negative voltage of 30 V, duty cycle of 10%, power frequency of 1000 Hz, oxidation time of 5 min, and the temperature of the micro-arc oxidation reaction electrolyte was kept below 50° C. After the end, the pretreated titanium alloy was rinsed with distilled water and dried, and a micro-arc oxidation layer was formed on the pretreated surface of the titanium alloy to obtain a titanium alloy with a micro-arc oxidation layer on the surface;

[0048] (3) Lighting an alcohol lamp, after the alcohol lamp burns stably, placing the titanium alloy having the micro-arc oxidation layer on the surface above the flame of the alcohol lamp, with the surface of the titanium alloy having the micro-arc oxidation layer 1.5 cm away from the flame center, depositing for 2 minutes in a cross-movement manner, and evenly distributing a layer of soot deposition layer on the micro-arc oxidation layer of the titanium alloy to obtain a titanium alloy having a soot deposition layer on the surface;

[0049] (4) Wipe the desiccator clean with alcohol and keep it dry. After ensuring that there is no moisture in the desiccator, place the titanium alloy with the soot deposition layer on the surface in the center of the desiccator, use a dropper to measure 2 mL of tetraethyl orthosilicate (TEOS) and 2 mL of ammonia water, respectively, and place them in open beakers, respectively. Place the beakers in the desiccators, apply vaseline to the mouth of the desiccator and seal it. After sealing for 24 hours, take it out and deposit a layer of silicon dioxide on the surface of the titanium alloy soot deposition layer to obtain a titanium alloy with a silicon dioxide layer;

[0050] (5) The titanium alloy with the silica layer is immersed in a 1 wt% FAS-17 ethanol solution for 2 h, and then taken out and dried in a tube furnace for 2 h. FAS-17 is grafted onto the surface of the silica layer of the titanium alloy to obtain a photothermal super-hydrophobic dual-functional coating on the titanium alloy surface.

[0051] Example 3

[0052] This embodiment provides a method for preparing a photothermal super-hydrophobic dual-function coating on a titanium alloy surface, comprising the following steps:

[0053] (1) using a wire cutting machine to cut a TC4 titanium alloy plate of 100 mm × 100 mm × 2 mm into a size of 20 mm × 20 mm × 2 mm, using SiC sandpaper to grind the cut titanium alloy in steps of 400 mesh, 800 mesh, 1200 mesh, and 2000 mesh, rinsing with deionized water, and then placing it in an acetone solution for ultrasonic cleaning and degreasing to obtain a pretreated titanium alloy;

[0054] (2) 15 g of sodium silicate, 10 g of sodium hexametaphosphate, 2 g of potassium hydroxide and 5 g of sodium metavanadate were dissolved in 1 L of deionized water, and after being fully dissolved, they were added to a stainless steel tank as an electrolyte, with the stainless steel tank as the cathode and the pretreated titanium alloy as the anode, and micro-arc oxidation treatment was performed using FL7-MAO30G micro-arc oxidation power supply equipment. The electrical parameters of the micro-arc oxidation treatment included: constant voltage mode, positive voltage of 450 V, negative voltage of 0 V, duty cycle of 30%, power frequency of 300 Hz, oxidation time of 25 min, and the temperature of the micro-arc oxidation reaction electrolyte was kept below 50° C. After the end, it was rinsed with distilled water and dried, and a micro-arc oxidation layer was formed on the pretreated surface of the titanium alloy to obtain a titanium alloy with a micro-arc oxidation layer on the surface;

[0055] (3) Lighting an alcohol lamp, after the alcohol lamp burns stably, placing the titanium alloy having the micro-arc oxidation layer on the surface above the flame of the alcohol lamp, with the surface of the titanium alloy having the micro-arc oxidation layer 1 cm away from the flame center, depositing for 1 min by a cross-movement method, and evenly distributing a layer of soot deposition layer on the micro-arc oxidation layer of the titanium alloy to obtain a titanium alloy having a soot deposition layer on the surface;

[0056] (4) Wipe the desiccator clean with alcohol and keep it dry. After ensuring that there is no moisture in the desiccator, place the titanium alloy with the soot deposition layer on the surface in the center of the desiccator, use a dropper to measure 2 mL of tetraethyl orthosilicate (TEOS) and 2 mL of ammonia water, respectively, and place them in open beakers, respectively. Place the beakers in the desiccators, apply vaseline to the mouth of the desiccator and seal it. After sealing for 24 hours, take it out and deposit a layer of silicon dioxide on the surface of the titanium alloy soot deposition layer to obtain a titanium alloy with a silicon dioxide layer;

[0057] (5) The titanium alloy with the silica layer is immersed in a 1 wt% FAS-17 ethanol solution for 12 h, and then taken out and dried in a tube furnace for 2 h. FAS-17 is grafted onto the surface of the silica layer of the titanium alloy to obtain a photothermal super-hydrophobic dual-functional coating on the titanium alloy surface.

[0058] Comparative Example 1

[0059] This comparative example proposes a method for preparing a photothermal super-hydrophobic dual-functional coating on a titanium alloy surface, which is referred to Example 1 except that steps (3), (4) and (5) are omitted.

[0060] Comparative Example 2

[0061] This comparative example proposes a method for preparing a photothermal super-hydrophobic dual-functional coating on a titanium alloy surface, which is referred to Example 1 except that step (2) is omitted.

[0062] Figure 1 This is a SEM image of the photothermal super-hydrophobic dual-functional coating on the titanium alloy surface described in Example 1. Figure 2 This is a SEM image of the photothermal and super-hydrophobic dual-function coating on the titanium alloy surface described in Comparative Example 1. Figure 1 , 2 It can be seen that in Comparative Example 1, there are a large number of pores on the surface of the titanium alloy sample subjected to simple micro-arc oxidation. In Example 1, the surface morphology of the sample after micro-arc oxidation of the titanium alloy and then deposition of the soot layer varies greatly. The original characteristics of the micro-arc oxidation film are covered and replaced by a large number of carbon nanoparticles, which have a coral-like morphology.

[0063] The photothermal super-hydrophobic dual-function coating on the titanium alloy surface of Example 1 and Comparative Example 1 was placed at 150 mW / cm 2 The simulated sunlight test was carried out under the light density of Figure 3 , 4 shown. Figure 3 This is a thermal image of the photothermal super-hydrophobic dual-function coating on the titanium alloy surface described in Example 1 after irradiation for 10 minutes under 1.5 Sun. Figure 4 This is a thermal imaging image of the photothermal super-hydrophobic dual-functional coating on the titanium alloy surface described in Comparative Example 1 after irradiation for 10 minutes under 1.5 Sun.

[0064] Reference Figure 3 , 4 It can be seen that in Example 1, after the titanium alloy is micro-arc oxidized and then the soot layer is deposited, the carbon nanoparticles are deposited on the micro-arc oxidized surface, and its coral-like microstructure enables the light to be reflected and refracted multiple times, which has an excellent light-to-heat conversion effect; in Comparative Example 1, the titanium alloy simple micro-arc oxidized sample has a good thermal conductivity at 150mW / cm 2 Under the illumination of 150mW / cm2, the sample temperature increased by 86.0℃ under the 10min simulated sunlight irradiation; while in Example 1, after the titanium alloy was micro-arc oxidized and then the soot layer was deposited, the sample temperature increased by 86.0℃ under the 10min simulated sunlight irradiation; 2 Under the illumination of , under 10 minutes of simulated sunlight irradiation, the sample temperature rises by 91.2°C. Compared with comparative example 1, embodiment 1 has a superior light-to-heat conversion effect.

[0065] Figure 5 This is a contact angle diagram of the photothermal super-hydrophobic dual-functional coating on the titanium alloy surface described in Example 1. Figure 5 It can be seen that when a water drop is placed on the surface of the sample described in Example 1, all parts of the surface of the sample described in Example 1 have good superhydrophobic properties. It is believed that the soot sample deposited on the micro-arc oxidation surface of the titanium alloy can have good superhydrophobic properties.

[0066] In fact, in Example 1, the sample of the titanium alloy after micro-arc oxidation and then depositing a soot layer has a nano-layered structure that can capture air, form an air layer when in contact with water, and transform into a Cassie-Baxter state, and the surface is super hydrophobic due to the presence of micro-nano rough structure and low surface energy groups. In Comparative Example 1, the surface of the titanium alloy sample simply micro-arc oxidation has an insignificant micro-nano rough structure and more hydrophilic groups, and the surface is hydrophilic.

[0067] Figure 6 This is a contact angle diagram of the photothermal super-hydrophobic dual-function coating on the titanium alloy surface described in Comparative Example 2. Figure 6 It can be seen that when a water droplet is placed on the surface, the central portion and the peripheral portion do not have the same superhydrophobic properties. It can be seen that in Comparative Example 2, the titanium alloy directly deposited with soot samples does not have a good superhydrophobic property.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a photothermal super-hydrophobic dual-function coating on a titanium alloy surface, characterized in that: The steps include: S1, titanium alloy surface pretreatment; S2, in-situ generation of a micro-arc oxidation layer on the pre-treated surface; S3. In-situ deposition of soot deposition layer on the surface of micro-arc oxidation layer.

2. The method for preparing a photothermal super-hydrophobic dual-function coating on a titanium alloy surface according to claim 1, characterized in that: In step S1, the "titanium alloy surface pretreatment" specifically includes: grinding the titanium alloy surface with 400-2000 mesh sandpaper, and then washing and degreasing; Preferably, the titanium alloy is TC4 titanium alloy, TA1 titanium alloy, TA2 titanium alloy or TA3 titanium alloy.

3. The method for preparing a photothermal super-hydrophobic dual-function coating on a titanium alloy surface according to claim 1 or 2, characterized in that: In step S2, the “in-situ generation of a micro-arc oxidation layer” specifically includes: using the titanium alloy as an anode and the stainless steel tank as a cathode, performing micro-arc oxidation treatment in an electrolyte, and forming a micro-arc oxidation layer on the pretreated surface of the titanium alloy; Preferably, the parameters of the micro-arc oxidation treatment include: positive voltage of 300-450V, negative voltage of 0-30V, duty cycle of 10-30%, power frequency of 300-1000Hz, oxidation time of 5-25min, and electrolyte temperature below 50°C.

4. The method for preparing the photothermal super-hydrophobic dual-function coating on the titanium alloy surface according to claim 3, characterized in that: The electrolyte is an aqueous solution including sodium silicate, sodium hexametaphosphate, potassium hydroxide and sodium metavanadate; Preferably, the mass ratio of sodium silicate, sodium hexametaphosphate, potassium hydroxide and sodium metavanadate is 15:5-15:1-3:4-6; Preferably, the concentration of sodium silicate is 10-20 g / L.

5. The method for preparing a photothermal super-hydrophobic dual-function coating on a titanium alloy surface according to any one of claims 1 to 4, characterized in that: In step S3, the “in-situ deposition of a soot layer” specifically includes: placing the titanium alloy above the flame of an alcohol lamp, moving the titanium alloy, and depositing a soot deposition layer on the surface of the titanium alloy micro-arc oxidation layer; Preferably, the titanium alloy is placed 1-1.5 cm from the center of the flame of the alcohol lamp; Preferably, the deposition time is 1-2 min.

6. The method for preparing a photothermal super-hydrophobic dual-function coating on a titanium alloy surface according to any one of claims 1 to 5, characterized in that: The method further comprises step S4 of vapor-depositing a silicon dioxide layer on the surface of the soot deposition layer; Preferably, in step S4, the "vapor-deposited silicon dioxide layer" specifically includes: placing the titanium alloy in a closed container, adding ethyl orthosilicate and ammonia water, and depositing a silicon dioxide layer on the surface of the titanium alloy soot deposition layer after volatilization.

7. The method for preparing the photothermal super-hydrophobic dual-function coating on the titanium alloy surface according to claim 6, characterized in that: The method also includes step S5, modifying the surface of the silicon dioxide layer with a low surface energy compound.

8. The method for preparing the photothermal super-hydrophobic dual-function coating on the titanium alloy surface according to claim 7, characterized in that: In step S5, the "modifying the low surface energy compound" specifically includes: immersing the titanium alloy in a FAS-17 ethanol solution, and grafting FAS-17 on the surface of the titanium alloy silicon dioxide layer; Preferably, the soaking time is 2-12 hours.

9. A photothermal super-hydrophobic dual-function coating on the surface of a titanium alloy, characterized in that: The compound is prepared by the preparation method according to any one of claims 1 to 8.

10. Application of the photothermal and super-hydrophobic dual-functional coating on the titanium alloy surface as claimed in claim 9 in photothermal deicing.

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