CN114656864B - Super-hydrophobic magnesium alloy coating and process thereof - Google Patents

Super-hydrophobic magnesium alloy coating and process thereof Download PDF

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CN114656864B
CN114656864B CN202210352309.1A CN202210352309A CN114656864B CN 114656864 B CN114656864 B CN 114656864B CN 202210352309 A CN202210352309 A CN 202210352309A CN 114656864 B CN114656864 B CN 114656864B
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magnesium alloy
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hydrophobic
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CN114656864A (en
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蔡美丽
陈天驰
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Jiangsu Normal University
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    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
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    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C23/00—Alloys based on magnesium
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    • 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
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    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
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    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives

Abstract

The invention discloses a super-hydrophobic magnesium alloy coating and a process thereof, wherein the magnesium alloy is magnesium-aluminum-zinc alloy, the strength and the corrosion resistance of the alloy can be enhanced by adding aluminum element, and the creep resistance of a casting can be improved by zinc. Thereby can improve the hydrophobicity on alloy surface at magnesium alloy's surface coating, thereby reach corrosion-resistant purpose, and contain zinc oxide in the coating, multi-walled carbon nanotube, several kinds of components of polycaprolactone, this application adopts spraying process can reduce into with simplified operation, and the alloy that obtains with coating possesses profitable super hydrophobic property, good corrosion-resistant effect, can also possess better electric conduction when good self-cleaning performance, heat conduction and heat dissipation function, can not reduce the advantage of magnesium alloy itself, in addition polycaprolactone's addition has higher macromolecular material compatibility, can improve the cohesion, improve the durability.

Description

Super-hydrophobic magnesium alloy coating and process thereof
Technical Field
The invention relates to the technical field of magnesium alloy surface modification, in particular to a super-hydrophobic magnesium alloy coating and a process thereof.
Background
The magnesium alloy is an ideal choice for developing lightweight equipment due to the advantages of light weight, high specific strength, simple manufacture, convenient recovery and the like. Especially the light weight and environmental protection requirements in the industries of transportation, aerospace, war industry, chemical engineering, communication and the like, and the research and development technology of magnesium alloy is promoted, so that the magnesium alloy is used in large scale. Magnesium alloy is the lightest metal material known at present, and has a specific gravity of about 2/3 that of aluminum and 1/4 that of iron. Therefore, the process research, upgrading and optimization of magnesium and magnesium alloy are the trends of promoting the development of scientific technology, enhancing national defense construction, developing new energy and protecting environment.
However, the magnesium alloy is active in chemical properties and is easy to corrode, so that the corrosion resistance of the magnesium alloy is a great problem in practical application. The following methods for protecting magnesium alloy against corrosion are known:
(1) chemical transfer method: completely immersing a metal sample into electrolyte, and reacting the metal sample with the electrolyte to generate a film on the surface of the metal;
(2) an anodic oxidation method: are generally applied to the electrochemical oxidation of metals or alloys. The material is almost the same as that of ceramic, so the ceramic has certain wear-resisting and corrosion-resisting functions;
(3) laser surface treatment method: the laser is used for dissolving and solidifying the surface of the material by utilizing a laser beam, so that a certain structural film layer is formed on the surface of the material, and the mechanical property and the like of the material can be modified, so that the wear resistance and the corrosion resistance of the material are improved;
(4) metal plating: the metal plating layer is formed on the surface of the magnesium and the magnesium alloy by chemical plating, electroplating, thermal spraying and the like, so that the corrosion resistance and the friction resistance of the magnesium and the magnesium alloy can be improved, and the metal plating layer on the surface of the magnesium alloy material can be adjusted according to different environments, actions and the like, so that the magnesium alloy has different properties, such as electric conductivity, solderability, thermal conductivity, wear resistance and the like;
(5) organic coating method: in order to enhance the corrosion resistance and the decorative property of magnesium alloys, magnesium alloys are usually subjected to various surface pretreatments, and then the surface film layer thereof is coated with an organic coating layer.
If a super-hydrophobic surface is established on the surface of the magnesium alloy, the surface can be waterproof, anti-sticking and anti-pollution, the effects of self-cleaning, resistance reduction and the like can be achieved, and meanwhile, the corrosion resistance can be greatly improved.
At present, many researches on solid-liquid wettability are carried out at home and abroad, wherein a Contact Angle (CA) is a common index for representing the wettability of the solid.
Normally, when a droplet is not completely spread on a solid surface, and when the droplet is in a stable state, the droplet forms an angle with the surface of the solid, the angle is called a contact angle, and in general, whether the surface of a material is hydrophobic or hydrophilic can also be obtained through the contact angle. A contact angle of a droplet is called a hydrophilic surface if it is less than 90 °, and a superhydrophilic surface if it is less than 5 °; conversely, a droplet having a contact angle greater than 90 ° is referred to as a hydrophobic surface, and a contact angle greater than 150 ° is referred to as a superhydrophobic surface.
The level of solids repelling liquid is determined by two factors: surface energy and surface morphology. When its surface energy is reduced, the surface hydrophobicity increases. The surface free energy is determined by the chemical composition of the surface, and thus the surface energy has a great influence on wettability, but a superhydrophobic surface cannot be obtained by merely lowering the surface energy. For example, with-CF 3 The material of the gene is a low surface energy material with good hydrophobicity, but the contact angle of a plane surface treated by the material can only reach 120 degrees at most. On superhydrophobic surfaces, the effect of surface topography on wettability is also critical. As air is an absolute hydrophobic material, the contact angle is 180 degrees, the roughness of the solid surface is increased, the rough structure of the surface can retain air, and an air cushion is formed between the surface and the surface which is also low so as to enhance the hydrophobicity of the surface.
Therefore, the application provides a super-hydrophobic magnesium alloy coating and a process thereof, nano-scale particles and micro-scale substances are formed on the surface of the magnesium alloy to construct the surface, so that the super-hydrophobic performance is obtained, and the corrosion resistance of the magnesium alloy is improved.
Disclosure of Invention
The invention aims to provide a super-hydrophobic magnesium alloy coating and a process thereof, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a super-hydrophobic magnesium alloy coating, which comprises a coating material,
the magnesium alloy is magnesium-aluminum-zinc alloy, the strength and the corrosion resistance of the alloy can be enhanced by adding the aluminum element, and the creep resistance of the casting can be improved by adding the zinc element.
The surface of the magnesium alloy is coated with the coating, so that the hydrophobicity of the surface of the alloy can be improved, and the purpose of corrosion resistance is achieved.
Specifically, the coating comprises zinc oxide, multi-walled carbon nanotubes and polycaprolactone.
The zinc oxide can improve the antibacterial performance of the surface of the super-hydrophobic coating and effectively prevent or inhibit the growth of microorganisms, has good antibacterial property, heat resistance and sun protection performance, and has the function of shielding ultraviolet rays, and the principle of the zinc oxide is absorption and scattering. The zinc oxide is added to improve the abrasion resistance of the surface of the coating, prevent the durability of the surface of the coating caused by abrasion and greatly improve the service life.
The multi-walled carbon nanotube is a nano material, is used as a nano-scale structure, the strip-shaped structure of the multi-walled carbon nanotube can enhance the strength of a coating, and the multi-walled carbon nanotube and zinc oxide can be mixed to improve the functions of electric conduction, heat conduction and heat dissipation, so that the advantages of the magnesium alloy can not be reduced when the electric conduction and the heat conduction performances of the magnesium alloy are required to be exerted after the magnesium alloy is sprayed with a coating. Meanwhile, the carbon nano tube can improve the performances of corrosion resistance, photo-thermal stability, strength, wear resistance and the like, and the surface quality and performance can be effectively improved by constructing the nanoscale rough structure of the magnesium alloy surface coating by the carbon nano tube.
The polycaprolactone, namely PCL, has better high polymer material compatibility, so that the binding force of other high polymers can be improved, and the biodegradability of the paint sprayed in the later period can be improved.
Specifically, the content of aluminum in the magnesium alloy is 2.5-3%, and the content of zinc is not more than 1%.
The reason is that when the content of the zinc is too much, the corrosion resistance of the alloy can be reduced, and when the content of the Zn is less than 1%, the solid solubility of the alloy is enhanced;
on the other hand, the solubility of Al in Mg can be enhanced, and the effect of solid solution strengthening of Al can be effectively enhanced.
The magnesium alloy also contains manganese element, Mn can prevent and reduce the generation of harmful meta-crystalline compounds, and in addition, Mn can refine crystal grains and improve the weldability.
Specifically, the magnesium alloy coating also contains perfluorodecyl trimethoxy silane, the solution is colorless transparent liquid, and the solution is used as a key material in an aggregate, so that the performance of other substances can be improved, the self-cleaning performance of the surface can be improved for the coating, and the function of oil-repellent liquid can be achieved.
A super-hydrophobic magnesium alloy coating process comprises the following steps of preparation and spraying, and specifically comprises the following steps:
m1, carrying out pretreatment on the magnesium alloy, wherein the pretreatment comprises the steps of sample polishing, sample washing and ultrasonic cleaning,
wherein, sample polishing: roughening the surface of the magnesium alloy by using abrasive paper to ensure that the surface roughness of the magnesium alloy is relatively uniform, and removing an oxide film and other residues on the surface to ensure that the surface of the magnesium alloy is relatively single;
sample washing: because a certain amount of residues are left on the surface after polishing, the surface is washed by absolute ethyl alcohol, most of stains such as metal scraps, grease and the like on the surface are washed off, and then the sample alloy is dried by an oven;
ultrasonic cleaning: even though the magnesium alloy sample is cleaned, most of residues on the metal surface of the magnesium alloy are cleaned, and further cleaning is needed, otherwise, the quality of the subsequent spraying film formation is greatly influenced, the surface stains can be effectively removed by using ultrasonic cleaning, so that the surface is cleaner, and the magnesium alloy sample is not corroded by using the ultrasonic cleaning. The cleaning medium is cleaned by using absolute ethyl alcohol and ultrasonic for 5 minutes.
And after the pretreatment, putting the cleaned product into an oven for drying.
M2, mixing a proper amount of zinc chloride with ammonia water;
m3, adding a proper amount of multi-wall carbon nanotube powder, and stirring under a hydrothermal condition;
m4, centrifuging to obtain a precipitate phase, adding a proper amount of water, and performing hydrothermal treatment again;
m5, adding a proper amount of the powder particles obtained in the step M4 into a proper amount of dichloromethane, wherein the dichloromethane has good dissolving power, a low boiling point, less toxicity compared with other solutions and good reaction inertness, so that dichloromethane is very suitable for being used as a dispersant for multi-wall carbon nanotubes, zinc oxide powder particles and PCL;
m6, adding a proper amount of polycaprolactone and perfluorodecyl trimethoxy silane;
m7, continuously stirring to obtain a coating;
m8, spraying the coating on the surface of the magnesium alloy treated in the step M1 by using a spray gun to obtain the coated super-hydrophobic magnesium alloy.
Specifically, in the step M2, 81.5 parts by weight of zinc chloride and 100 parts by volume of ammonia water are used, in the step M5, 3 parts by weight of powder particles and 150 parts by volume of dichloromethane are used, in the step M6, 1.8 parts by weight of polycaprolactone and 1 part by volume of perfluorodecyl trimethoxy silane are used, and in the above mixture ratio, g is used as an equivalence ratio and ml is used as an equivalence ratio.
Compared with the prior art, the invention has the beneficial effects that: the magnesium alloy super-hydrophobic surface coating is sprayed by using a spraying method by taking magnesium alloy metal as a basic carrier, so that the cost can be reduced, and the preparation time and operation equipment can be simplified; the adopted multi-walled carbon nano tube can effectively improve the surface quality and performance and can also improve the functions of electric conduction, heat conduction and heat dissipation; moreover, the coating is added with polycaprolactone, so that the binding force between zinc oxide and multi-walled carbon nanotube powder and other molecules is enhanced, the strength of a fine structure on the surface of the super-hydrophobic material is improved, and the coating also has certain biodegradability; the application also provides the technical process and specific technical parameters of the magnesium alloy coating, so that the proportioning has excellent super-hydrophobic property, good corrosion resistance effect and good self-cleaning property.
Drawings
FIG. 1 is an X-ray diffraction pattern of powder particles, zinc oxide, and multi-walled carbon nanotubes of the present invention;
FIG. 2 is a XPS analysis of the present invention (a) a full spectrum (b) a C1s fine plot (C) an O1s ZnO free fine plot (d) an O1s ZnO containing fine plot;
FIG. 3 is an optical diagram of the contact angle of the coating surface obtained by the coating process according to the present invention with different formulation parameters;
FIG. 4 is an SEM image of the surface of a coating obtained by the coating process of the present invention at various dosages
FIG. 5 shows the wetting of the coating surfaces with different liquids obtained by the coating process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to compound zinc oxide (ZnO) and multi-walled carbon nano-powder (MWCNT) particles, two approaches were used for experimental comparison.
The first method comprises the following steps: 0.35g of PCL powder is weighed on a balance and poured into a beaker, 15ml of dichloromethane solution is added, then 0.1g of ZnO and 0.1g of multi-walled carbon nano powder are added, a rotor is added, and the mixture is placed in a stirring table for stirring. After stirring for 5 minutes, 100. mu.l of perfluorodecyltrimethoxysilane modifier was added, stirring was continued, and spraying was carried out after 12 hours.
And the second method comprises the following steps: 0.815g of zinc chloride, 1ml of ammonia water and 0.5g of multi-walled carbon nano-tube are stirred at 120 ℃ in a hydrothermal mode, then powder particles are obtained through centrifugation, 0.3g of the powder particles are obtained, 0.35g of PCL and 15ml of dichloromethane are added for stirring, and 100 mu l of perfluorodecyl trimethoxy silane solution is added into the stirred solution. And then placing the mixture on a stirring table for stirring, and spraying the mixture after stirring for 5 hours.
Note that: (1) the density of the spray is required to be uniform during spraying, and the spray cannot be intermittent, so that the quality of a surface layer after spraying is affected, and the conditions of uneven coating, high left and low right and the like are caused;
(2) cleaning the air vent or the spraying hole of the nozzle in time to prevent the blockage of the air vent or the spraying hole from causing that the coating cannot be sprayed out of the nozzle in time to influence the surface quality of the coating;
(3) in the spraying process, in order to avoid excessive atomization of the sprayed coating and reduce the surface adhesion amount of the coating, the air pressure needs to be properly reduced and the coating output amount needs to be increased;
(4) trial spraying is carried out before spraying the coating, the phenomenon that the work of a spray gun is interrupted due to too small air pressure is avoided, and the air pressure is adjusted to be moderate.
(5) During spraying, the distance of 5-10cm from the metal surface should be kept not too far, so that the solidification phenomenon is generated before the metal surface is sprayed, and the surface quality is influenced.
And (3) detecting and characterizing the alloy sample after spraying, wherein the specific characterization comprises coating appearance evaluation, binding force test, corrosion resistance test, hydrophobicity test and hardness test.
The alloy obtained by the second way is found after the experimental characterization, when a water drop experiment is carried out, the angle of the water drop can reach 153 degrees, the super-hydrophobic effect can be achieved, the surface of the coating is smooth and clean, the film-forming performance is good, the hardness can reach grade B of pencil hardness, the corrosion resistance is also good, and no obvious flaw and surface looseness phenomenon can occur after the coating is soaked in salt water for more than 7 days. Because the zinc oxide and the multi-wall carbon nano tube particles are combined with the PCL powder particles after the chemical reaction, the obtained binding force is much better than that of the first approach.
And the powder particles, the zinc oxide and the multi-walled carbon nanotubes obtained in the step M4 are detected by XRD, and the result is shown in fig. 1, because the MWCNT does not have a peak but only has a small bulge in a steamed bread shape at a certain position, the MWCNT of the graph has an obvious bulge at 25 °, and it can be seen that the ZnO @ MWCNT has three peaks at diffraction angles between 30 ° and 40 °, and comparison according to the graph shows that the ZnO @ MWCNT of the powder particles obtained in the step M4 does contain ZnO and MWCNT.
In addition, as can be seen from the XPS analysis in fig. 2, since the chemical composition of the surface of the superhydrophobic coating is complex, information on the chemical bonds between the elements can be obtained.
The full spectrum of FIG. 2(a) shows the comparison of reacted materials together as follows:
(1) the ZnO @ MWCNT contains C, O and Zn elements.
(2) Since Mg is not combined with other combined raw materials, only C, O and Mg are elements.
(3) In FAS-PCL, not only C, O elements but also F elements are added due to the reaction between fluorosilane and PCL.
(4) The super-hydrophobic surface coating is composed of FAS-ZnO @ MWCNT @ PCL, wherein C, O, F and Zn elements are contained in the super-hydrophobic surface coating.
(5) In addition to the peaks at the electron orbits, there are small raised peaks in the whole spectrum, which are caused by small contaminations during the inspection.
This is because, as shown in FIG. 2(b), the FAS-PCL shows a fine pattern of C1s having a binding energy of 282 to 296 after the reaction between fluorosilane and PCL. This figure shows that FAS-PCL contains a C-C single bond, a C-O single bond, and a C ═ O double bond, and further contains CF 2 And CF 3 . The disconnection of the carbon chain in the PCL is disconnected with the Si-O chain in the fluorosilane.
As shown in FIG. 2(c), the fine diagram of the FAS-PCL with the electron orbital O1s shows that it has a carbon-oxygen single bond and a carbon-oxygen double bond. On the other hand, as can be seen from FIG. 2(d), in the fine diagram of the electron orbital of FAS-ZnO @ MWCNT @ PCL, which is O1s, it can be seen that this position contains not only a carbon-oxygen single bond and a carbon-oxygen double bond, but also ZnO.
In order to obtain the ratio of the process parameters, the following sets of experiments were performed on the powder particles obtained in step M4 as a powder particles a (ZnO @ MWCNT), and the addition amount of PCL, the addition amount of a powder particles, and the preparation ratio of a powder particles were adjusted. The contact angle optical diagram is shown in FIG. 3, in which (a) - (i) are photographs taken with different compositions.
When the proportional usage of the powder particles A exceeds 0.2g, the contact angles can be larger than 150 degrees so as to form a super-hydrophobic surface, the usage of the powder particles A is increased after the proportion of the powder particles A is 0.3g, the change is not large, meanwhile, when the preparation proportion of the powder particles A is 0.815g of zinc chloride, 1ml of ammonia water, 0.3g of A powder particles obtained under 0.5g of multi-walled carbon nano-tubes, 0.18g of PCL, 100ul of perfluorodecyl trimethoxy silane and 15ml of dichloromethane, a coating with a high hydrophobic effect can be obtained, the contact angle reaches 158 degrees, as shown in the result of the group (g) in figure 3, no obvious particulate matters exist on the surface, the spraying is neat, and no obvious filaments are generated during the spraying; in addition, zinc chloride powder is scattered on the surface of the coating, water drops can be used for dropping and being washed away, and the surface has a high self-cleaning type.
Characterization of electron microscope
In order to more intuitively reflect the appearance of the coating surface, the experiments (a) to (f) are set, the dosage of the powder particles A is respectively changed into (a) magnesium sheets, (b) pure PCL, (c)0.05g A powder, (d)0.1g A powder, (e)0.3g A powder, (f)0.25g powder, and an electron microscope (SEM) image with different scales is shown in FIG. 4, and as can be seen from (e1) in FIG. 4, the coating surface is accompanied with a large amount of substance bulges with micrometer level, is uneven, is relatively rough, and has larger intervals among gaps; as can be seen from fig. 4(e2), there is a smaller spacing between the micron-sized materials, and there is also a smaller particle size of the materials on the micron-sized particles; since fig. 4(e3) is observed under an electron microscope of 16 ten thousand times, it can be seen in more detail that nano-scale particles, which have a size varying from 1nm to 250nm, are also present on the micro-scale particles. The MWCNT is used as nano-scale particles, and under the action of a modified raw material PCL, other substances have better polymerization performance, so that micron-scale aggregates exist on the surface of the MWCNT, and nano-scale particles exist on the surface of the MWCNT.
In addition, different liquids are tested, and as shown in fig. 5, the coating of the process cannot be soaked by the four liquids under the conditions of hydrophobicity, glycol, peanut oil and hexadecane; and the rolling angles are all around 5 degrees, and the resistance is well reduced.
In addition, in order to verify the corrosion resistance of the coating, the magnesium alloy with the process is placed in a NaCl solution, and the magnesium alloy does not soak when being soaked in the NaCl solution because the magnesium alloy is a super-hydrophobic surface. The surface of the coating is observed to be whitish and bright at a good position, the solution and the surface of the coating are separated by an obvious air film, so that the surface of the coating is protected from being soaked, and after 7 days of soaking, the observation shows that the surface of the super-hydrophobic coating is not corroded, the surface of the coating is still intact as before, and no air bubbles are generated in the beaker. And a layer of air film is formed on the super-hydrophobic surface, so that liquid cannot infiltrate into the inside. Taking out the magnesium alloy metal sheet, placing the magnesium alloy metal sheet in an oven for drying, weighing the magnesium alloy metal sheet, and weighing the magnesium alloy metal sheet without obvious change after 15 days, taking out the magnesium alloy metal sheet again, placing the magnesium alloy metal sheet in the oven for drying, weighing the magnesium alloy metal sheet, finding that the weight of the magnesium alloy metal sheet does not have obvious change, and separating the solution from the coating by still having an air film on the surface of the solution so as not to generate the infiltration phenomenon.
In conclusion, the coating obtained by the super-hydrophobic magnesium alloy coating and the process thereof have excellent super-hydrophobic performance, meanwhile, the surface can realize the effects of water resistance, adhesion resistance and pollution resistance, self-cleaning, resistance reduction and the like, the corrosion resistance is greatly improved, and the biodegradability is improved to some extent, so that the coating is environment-friendly.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (2)

1. A preparation process of a magnesium alloy with a super-hydrophobic coating comprises the following steps:
m1, pretreating the magnesium alloy;
m2, 0.815g of zinc chloride is taken to be mixed with 1ml of ammonia water;
m3, adding 0.5g of multi-walled carbon nanotube powder, and stirring under a hydrothermal condition;
m4, centrifuging to obtain a precipitate phase, adding a proper amount of water, and performing hydrothermal treatment again;
m5, taking 0.3g of the powder particles obtained in the step M4, and adding the powder particles into 15ml of dichloromethane;
m6, adding 0.18g of polycaprolactone, 100. mu.l of perfluorodecyltrimethoxysilane;
m7, continuously stirring to obtain a coating;
m8, spraying the coating on the surface of the magnesium alloy treated in the step M1 by using a spray gun to obtain the coated super-hydrophobic magnesium alloy.
2. The preparation process of the magnesium alloy with the super-hydrophobic coating according to claim 1, wherein the preparation process comprises the following steps: the pretreatment comprises the steps of sample polishing, sample washing and ultrasonic cleaning.
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