CN110468415B - Preparation method and application of metal super-hydrophobic surface - Google Patents

Preparation method and application of metal super-hydrophobic surface Download PDF

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CN110468415B
CN110468415B CN201910763354.4A CN201910763354A CN110468415B CN 110468415 B CN110468415 B CN 110468415B CN 201910763354 A CN201910763354 A CN 201910763354A CN 110468415 B CN110468415 B CN 110468415B
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CN110468415A (en
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张松
张静
满佳
李取浩
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Shandong University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/355—Texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/362—Laser etching
    • B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/60—Preliminary treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/16—Acidic compositions
    • C23F1/26—Acidic compositions for etching refractory metals

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Abstract

The invention relates to the field of preparation of super-hydrophobic materials, in particular to a preparation method and application of a metal super-hydrophobic surface. The method comprises the following steps: 1) carrying out laser processing on the surface of the polished and cleaned metal product by adopting set laser parameters and a processing path to obtain a microstructure product; 2) putting the microstructure product into a mixed acid solution with a specific concentration, carrying out ultrasonic treatment on the acid solution containing the microstructure product, and removing residual liquid on the product after the ultrasonic treatment is finished; 3) carrying out hydroxylation treatment on the microstructure product obtained in the step (2); 4) and (3) carrying out surface energy reduction treatment on the hydroxylated microstructure product in the step 3). According to the invention, a characterizable regular multi-feature microstructure is prepared on the surface of pure titanium, and the regular microstructure can be characterized by appropriate size elements, so that convenience is provided for the subsequent study of the relation between the wetting characteristic and the microstructure size.

Description

Preparation method and application of metal super-hydrophobic surface
Technical Field
The invention relates to the field of preparation of super-hydrophobic materials, in particular to a preparation method and application of a metal super-hydrophobic surface.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
In recent years, with the continuous development of bionics, the super-hydrophobic phenomenon in nature is more and more concerned, and the most representative lotus leaf effect gradually enters the visual field of researchers. For the super-hydrophobic self-cleaning property of lotus leaves which are discharged from sludge and are not dyed, the existing research shows that the main reason of the self-cleaning effect is attributed to the specific microstructure and chemical substances of the surface. Scanning electron micrographs show that the lotus leaf surface has 20-40 mu m protrusions, and the micron-sized protrusion surface is accompanied with nanoscale particle characteristics, so that the contact area between liquid drops and the surface is reduced by the micro-nano composite structure. Secondly, the waxy substances on the surface of the lotus leaf mainly consist of-C-H and-C-O bonds, and the material with low surface energy further reduces the adsorption force of liquid drops and pollutants on the surface. Therefore, the lotus leaves have a self-cleaning function under the dual actions of the specific structure and the chemical substances on the surface.
Under the influence of the superhydrophobic effect, more and more superhydrophobic materials are applied to actual life. For example, the super-hydrophobic metal surface modification can be applied to marine instruments, so that the corrosion rate of metal in a working environment is reduced, and the service life of the marine instruments is prolonged; on the other hand, the resistance of the underwater transport tool during navigation is reduced, and the navigation efficiency is improved. And secondly, the super-hydrophobic surface modification can be applied to the aspects of aerospace, the anti-icing capacity of the surface of the material is improved, the navigation resistance is reduced, and the navigation safety is improved. Furthermore, the study on the wetting property and biocompatibility of the surface of the interventional medical material has also received attention of many researchers, and the biocompatibility of the material is improved by controlling the adhesion of cells and blood proteins by changing the hydrophilic and hydrophobic properties of the surface of the medical material.
Due to the gradual maturity of precision manufacturing technology, electrochemical technology, lithography technology and the like, the research on realizing the super-hydrophobic function on the surfaces of different materials is deeper and wider. Two major factors are mainly considered for the preparation of the super-hydrophobic surface, namely the microstructure of the surface of the reasonable construction material, which mainly comprises the size, the shape and the like of the microstructure. Secondly, a proper chemical treatment method is selected to further reduce the surface energy of the material. At present, the existing method for constructing the surface microstructure of the material on the metal matrix mainly comprises modes of micro-cutting, laser processing, plasma processing, electrochemistry and the like; the realization of the micro-milling technology requires expensive micro-milling tools and high-precision machine tools, and the application of the technology to the preparation of micron-sized structures is limited in consideration of the aspects of tool size, machining efficiency, wear characteristics of micro-sized tools and the like. The plasma processing technology needs complete sets of supporting facilities in the realization process, and the manufacturing cost is high. In addition, according to the characteristics of electrochemical machining and other technologies, the preparation of the regular micron-sized structure is still difficult to realize.
Disclosure of Invention
The invention considers that: how to prepare a microstructured superhydrophobic surface with regular characterizable features remains a challenge in current research. Aiming at the problems, the invention aims to provide a preparation method and application of a metal super-hydrophobic surface.
The first object of the present invention: provides a preparation method of a metal super-hydrophobic surface.
The second object of the present invention: provides the application of the preparation method of the metal super-hydrophobic surface.
In order to realize the purpose, the invention discloses the following technical scheme:
firstly, the invention discloses a preparation method of a metal super-hydrophobic surface, which comprises the following steps:
(1) laser processing: performing laser processing on the surface of the polished and cleaned metal product by adopting set ultraviolet laser parameters and a processing path to obtain a microstructure product; the laser parameters are: the scanning speed is 200-; the processing path parameters are as follows: the distance between the processing paths is 35-60 μm, and the scanning times are 3-14.
(2) Acid etching and ultrasonic treatment: placing the microstructured product in HF and HNO3And subjecting the acid solution containing the microstructured product to ultrasound.
(3) Hydroxylation treatment: and (3) carrying out hydroxylation treatment on the microstructure product obtained in the step (2).
(4) And (3) surface energy reduction treatment: and (4) carrying out surface energy reduction treatment on the hydroxylated microstructure product in the step (3) to obtain the product.
As a further technical solution, in the step (1), the polishing and cleaning method comprises: and carrying out thermal inlaying, physical polishing and ultrasonic cleaning on the metal product.
As a further technical scheme, the hot embedding temperature is 130 degrees, the material is metallographic embedding powder, and the embedding time is 6-8 minutes.
As a further technical scheme, the polishing is physical polishing, 1200-mesh and 2000-mesh sandpaper is used for polishing in sequence, and then diamond polishing agents with the grain sizes of 3.5 microns and 1.5 microns are used for polishing respectively until the surface roughness of a sample metal product reaches Ra0.2-0.3 microns.
As a further technical scheme, the ultrasonic cleaning refers to sequentially cleaning the metal product with acetone, absolute ethyl alcohol and deionized water for 10 minutes respectively.
As a further technical scheme, in the step (1), the metal is pure titanium, the pure titanium can be used as a medical material after surface super-hydrophobic treatment, and the adhesion of cells and blood proteins can be controlled by controlling the hydrophilic and hydrophobic characteristics of the surface of the material, so that the biocompatibility of the material is improved.
As a further technical scheme, in the step (1), the laser processing is ultraviolet laser processing. The cold light source laser processing mode not only generates less heat in the processing process, but also further reduces the processing heat affected zone; and has the advantages of low cost and high efficiency.
As a further technical solution, in the step (2), the method for removing the residual liquid on the surface of the product comprises: and sequentially washing the product with acetone, absolute ethyl alcohol and deionized water for 8-12 minutes respectively, and then drying at 50-60 ℃ for 3-5 minutes to obtain the product.
As a further technical solution, in the step (2), the parameters of the ultrasonic treatment are as follows: the power is 240W, the ultrasonic frequency is 40KHz, and the processing time is 3-5 minutes.
As a further technical scheme, in the step (2), the mixed acid solution comprises the following components: 0.24-0.27 wt% of HF,1.0-1.4 wt% of HNO3And the balance of deionized water. Preferably 0.26 wt% HF,1.2 wt% HNO3And the balance of deionized water.
As a further technical solution, in the step (3), the hydroxylation treatment method is: treating with ultraviolet irradiation for 2 h.
As a further technical solution, in the step (4), the method for reducing the surface energy includes a silanization treatment or the like.
As a further technical solution, the silanization treatment method comprises: putting the hydroxylated microstructure product into silane solution with specific concentration for surface modification treatment, taking out the sample, and performing high-temperature dehydration condensationProcessing to obtain the product; the silane solution comprises the following components: 1 wt% of tridecafluorooctyltriethoxysilane, 10 wt% of deionized water, 89 wt% of anhydrous ethanol and 3-4 drops of NH3·H2O; the treatment time is 6-7h, and the high-temperature dehydration condensation treatment comprises the following steps: the treatment was carried out at 120-130 ℃ for 40-60 minutes.
The invention further discloses application of the metal super-hydrophobic surface preparation method in the fields of aerospace, marine instrument preparation, medical material preparation and the like.
One of the characteristics of the preparation method of the metal super-hydrophobic surface provided by the invention is as follows: based on the ultraviolet laser, the processing heat is less, the processing heat affected zone can be further reduced, so that a representable microstructure with regularity and multiple characteristics is prepared on the surface of pure titanium, and the size of the microstructure is close to or even smaller than the size of a micron-sized protruding structure of lotus leaves.
The preparation method of the metal super-hydrophobic surface provided by the invention is characterized by comprising the following steps: the micron structure obtained by laser processing is treated by adopting a method combining acid etching and ultrasound, wherein HF is easy to react with an oxidation product (TiO) after laser processing2TiO) reaction to produce titanate and water, HNO3Salt compounds and carbon impurities can be further dissolved, and F can be improved under the strong acid environment-The reaction efficiency of (a). Secondly, the metal slag on the surface of the microstructure can be reacted with acid more uniformly through ultrasonic treatment, and the generated titanate can be prevented from being attached to the processed surface, so that the processed surface is smooth and flat, and the roughness reaches Ra0.2-0.35 mu m. The comprehensive consideration of the treatment method reduces the content of acid in the acid etching solution and the time of corrosion treatment, improves the treatment efficiency and further reduces the influence of the corrosion waste liquid on the environment.
The preparation method of the metal super-hydrophobic surface provided by the invention has the third characteristic that: the method for preparing the microstructure realizes the research of the relation between the size of the microstructure and the surface wetting characteristic, and provides conditions for the subsequent research of the relation between the wetting characteristic and the size of the microstructure.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, a characterizable regular multi-feature microstructure is prepared on the surface of pure titanium, and the regular microstructure can be characterized by appropriate size elements, so that convenience is provided for the subsequent study of the relation between the wetting characteristic and the microstructure size.
(2) The size of the microstructure prepared on the metal surface is close to or even smaller than the size of the micron-sized convex structure of the lotus leaf; in addition, the method can obtain excellent super-hydrophobic performance only by preparing the micron-sized convex structure, and does not need to prepare the micro-nano composite structure on the lotus leaf surface.
(3) The highest contact angle of the super-hydrophobic surface prepared by the method is as high as 170 degrees, and the super-hydrophobic surface has higher hydrophobic property compared with the existing super-hydrophobic surface.
(4) The super-hydrophobic surface prepared by the method has more stable hydrophobic characteristic, and the contact angle is still kept above 150 degrees after 30min of ultrasonic treatment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a three-dimensional surface topography and two-dimensional profile after polishing and cleaning in example 1 of the present invention.
Fig. 2 is a three-dimensional topography map and a two-dimensional profile map of the microstructure after the acid etching and ultrasonic wave combined treatment in the embodiment 1 of the invention.
FIG. 3 is a two-dimensional profile of a three-dimensional topography map of a microstructure after acid etching and ultrasonic treatment in example 2 of the present invention.
FIG. 4 is a two-dimensional profile of a three-dimensional topography map of a microstructure after acid etching and ultrasonic treatment in example 3 of the present invention.
FIG. 5 is a diagram showing the droplet morphology on the superhydrophobic surface in example 1 of the present invention.
FIG. 6 is a diagram showing the droplet morphology on the superhydrophobic surface in example 2 of the present invention.
FIG. 7 is a diagram of the droplet morphology on the superhydrophobic surface in example 3 of the invention.
FIG. 8 is the surface contact angle variation trend of the superhydrophobic surface in example 3 of the invention after being subjected to ultrasonic treatment for different time.
FIG. 9 shows the surface contact angle variation trend of the microstructure obtained at different depths in example 4 of the present invention.
FIG. 10 is a graph showing the variation trend of the contact angle of the microstructure surface with different sizes of sides of the convex quadrangle obtained in example 4 of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
As described above, the existing methods for constructing a material surface microstructure on a metal substrate by micro-cutting, laser processing, plasma processing, electrochemistry, etc. still cannot realize the preparation of a microstructure superhydrophobic surface with regularity that can be characterized. Therefore, the invention provides a preparation method of a metal super-hydrophobic surface; the invention will now be further described with reference to the accompanying drawings and detailed description.
Example 1
A preparation method of a metal super-hydrophobic surface comprises the following steps:
(1) cleaning and polishing a sample: pure titanium (BT1-00, purity not less than 99.8%) sample size 10mm x 2.5mm was prepared, and the sample was inlaid and polished. The mosaic temperature is 130 degrees, and the mosaic time is 6-8 minutes. The polishing method comprises the following steps: sequentially polishing with 1200-mesh and 2000-mesh sandpaper, and then respectively polishing with diamond polishing agents with the particle sizes of 3.5 mu m and 1.5 mu m until the surface roughness of the sample reaches Ra0.2-0.3 mu m.
(2) Ultraviolet laser processing (model XCGX-3W): placing the polished and cleaned sample on a processing platform for laser processing; wherein, the processing parameters are respectively as follows: the scanning speed is 400mm/s, the current is 1A, the frequency is 40KHz, and the pulse width is 16 mus. The processing path distance was 35 μm, and the number of scans was 10.
(3) Slag acid etching treatment: placing a sample after laser processing into a prepared mixed acid solution, wherein the mixed acid solution comprises the following components: 0.26 wt% HF,1.2 wt% HNO3And the balance of deionized water. And (3) combining the acid etching process with ultrasonic oscillation, wherein the ultrasonic power is 240W, the ultrasonic frequency is 40KHz, the processing time is 5 minutes, and the surface of the sample is observed through an optical microscope until the smooth and bright slag on the surface of the microstructure disappears. The samples were then washed in acetone, absolute ethanol and deionized water for 10 minutes each and finally dried at 60 ℃ for 5 minutes.
(4) Sample surface hydroxylation treatment: and (5) irradiating the dried sample under an ultraviolet lamp for 2 hours to obtain the material.
(5) Sample silanization treatment: the sample subjected to hydroxylation treatment was placed in a prepared silane solution (100ml) containing 1 wt% of tridecafluorooctyltriethoxysilane, 10 wt% of deionized water, 89 wt% of anhydrous ethanol and 4 drops of NH3·H2And O, the treatment time is 6 hours, the sample is subjected to high-temperature dehydration condensation treatment at the temperature of 130 ℃ for 40 minutes after the treatment is finished, and the medical pure titanium super-hydrophobic surface with the regular multi-feature microstructure is obtained after the treatment is finished.
Example 2
A method for preparing a metal super-hydrophobic surface, which is different from the embodiment in that: in the step (2), the scanning times are 12 times, and the mixed acid solution comprises the following components: 0.24 wt% HF,1.0 wt% HNO3And the balance of deionized water.
Example 3
A method for preparing a metal super-hydrophobic surface is different from the embodiment in that: in the step (2), the number of scanning times is 14, and the mixed acid solution comprises the following components: 0.27 wt% HF,1.4 wt% HNO3And the balance of deionized water.
And (3) performance testing:
referring to fig. 1, the surface roughness of the pure titanium sample after polishing and cleaning is about ra0.2-0.3 μm.
Fig. 2, 3, and 4 show the multi-feature micron-scale structures prepared in embodiments 1 to 3, respectively, where the side length of the regular protruding quadrilateral is about 10 μm, and the groove depths are about 15 μm, 19 μm, and 22.5 μm, respectively, due to the difference in the processing times, and the sizes thereof are close to or even smaller than the size of the lotus leaf surface micro-protruding structure, the regular microstructure surface preparation technology realizes the low-cost preparation of the bionic structure surface with the same size order of magnitude on the metal surface, and provides possibility for the subsequent study of the size of the microstructure and the surface wetting property.
Fig. 5, 6, 7 show the wetting state of the droplets of the modified surfaces of examples 1-3, respectively, in which the contact angle increases from 158.8 ° to 170 ° with increasing depth, and a superhydrophobic surface is fully provided, especially the contact angle of example 3 has approached the limit of 180 °.
Fig. 8 shows the surface contact angle variation trend of the superhydrophobic surface prepared in example 3 after being subjected to ultrasonic treatment for different times. Wherein the ultrasonic power involved in ultrasonic treatment is 240W, the frequency is 40KHz, each ultrasonic treatment is carried out for 10min, and the surface contact angle is measured after the ultrasonic treatment is placed for 17 h. Wherein, after accumulative ultrasonic treatment for 30min and standing for 48-50h, the contact angle of the surface of the sample is still kept above 150 degrees, which is enough to show that the super-hydrophobic surface prepared by the method has higher stability.
Example 4
By changing laser processing parameters, microstructure surfaces with different depths and different protruding quadrilateral edge lengths are obtained. Fig. 9 shows the relationship between the microstructure depth and the surface wetting property, wherein it can be seen from fig. 9 that the surface hydrophobic property is increased with the increase of the depth. But the surface hydrophobic property increases more slowly after increasing the depth to 20 μm. Fig. 10 shows the effect of protrusion edge length on surface wetting properties in microstructures. It is clear from fig. 10 that the hydrophobic property of the surface decreases with increasing side length of the convex square, and the change of the wetting property is less obvious when the side length is less than 20 μm. The study on the relationship between the structure size and the wetting characteristic by combining the fig. 9 and the fig. 10 can provide reference for the later preparation of the micron-sized super-hydrophobic surface.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. A preparation method of a metal super-hydrophobic surface is characterized by comprising the following steps:
(1) laser processing: carrying out laser processing on the surface of the polished and cleaned metal product by adopting set laser parameters and a processing path to obtain a microstructure product; the laser parameters are: the scanning speed is 200-; the processing path parameters are as follows: the distance of the processing path is 35-60 μm, and the scanning times are 3-14;
(2) acid etching and ultrasonic treatment: placing the microstructured product in HF and HNO3In the formed mixed acid solution, carrying out ultrasonic treatment on the acid solution containing the microstructure product, and removing residual liquid on the product after the ultrasonic treatment is finished;
(3) hydroxylation treatment: carrying out hydroxylation treatment on the microstructure product obtained in the step (2);
(4) and (3) surface energy reduction treatment: carrying out surface energy reduction treatment on the hydroxylated microstructure product in the step (3) to obtain the product;
in the step (1), the laser processing adopts ultraviolet laser processing;
in the step (4), the surface energy reducing treatment method comprises silanization treatment;
the silanization treatment method comprises the following steps: putting the hydroxylated microstructure product into a silane solution with a specific concentration for surface modification treatment, and taking out a sample for high-temperature dehydration condensation treatment to obtain the product; the silane solution comprises the following components: 1 wt% of tridecafluorooctyltriethoxysilane, 10 wt% of deionized water, 89 wt% of anhydrous ethanol and 3-4 drops of NH3·H2O; the treatment time is 6-7h, and the high-temperature dehydration condensation treatment comprises the following steps: the treatment is carried out at 120-130 ℃ for 40-60 minutes.
2. The method for preparing the metal superhydrophobic surface according to claim 1, wherein in the step (2), the method for removing the residual liquid on the surface of the product comprises: and sequentially washing the product with acetone, absolute ethyl alcohol and deionized water for 8-12 minutes respectively, and then drying at 50-60 ℃ for 3-5 minutes to obtain the product.
3. The method for preparing the metal superhydrophobic surface according to claim 1, wherein in the step (2), the parameters of the ultrasonic treatment are as follows: the power is 240W, the ultrasonic frequency is 40KHz, and the processing time is 3-5 minutes.
4. The method for preparing a metallic superhydrophobic surface according to claim 1, wherein in the step (2), the mixed acid solution comprises the following components: 0.24-0.27 wt% of HF,1.0-1.4 wt% of HNO3And the balance of deionized water.
5. The method for preparing a metallic superhydrophobic surface according to claim 4, wherein the mixed acid solution comprises the following components: 0.26 wt% HF,1.2 wt% HNO3And the balance of deionized water.
6. The method for preparing a metal superhydrophobic surface according to claim 1, wherein in the step (3), the hydroxylation treatment method comprises: treating with ultraviolet irradiation for 2 h.
7. The method for preparing a metallic superhydrophobic surface according to any one of claims 1-6, wherein in the step (1), the metal is pure titanium.
8. The method for preparing a metal superhydrophobic surface according to any one of claims 1-6, wherein in the step (1), the polishing and cleaning method comprises: and carrying out thermal inlaying, physical polishing and ultrasonic cleaning on the metal product.
9. The method for preparing a metal superhydrophobic surface according to claim 8, wherein the thermal inlaying temperature is 130 ℃, the material is metallographic inlaying powder, and the inlaying time is 6-8 minutes.
10. The method for preparing a metal superhydrophobic surface according to claim 8, wherein the polishing is physical polishing, and 1200-mesh and 2000-mesh sandpaper are sequentially used for polishing, and then diamond polishing agents with the grain sizes of 3.5 μm and 1.5 μm are respectively used for polishing until the surface roughness of the sample metal product reaches Ra0.2-0.3 μm.
11. The method for preparing a metal superhydrophobic surface according to claim 8, wherein the ultrasonic cleaning is to sequentially clean the metal product with acetone, absolute ethyl alcohol and deionized water for 10 minutes.
12. The use of the method of any one of claims 1 to 11 for the preparation of a metal superhydrophobic surface in the aerospace field, in the preparation of marine devices, and in the preparation of medical materials.
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