High-efficiency super-hydrophobic / corrosion-resistant dual-function coating on surface of carbon fiber reinforced composite material

Abstract

The invention relates to an efficient super-hydrophobic / anti-corrosion dual-function coating on the surface of a carbon fiber reinforced composite material, and belongs to the technical field of material surface corrosion protection. The dual-function coating is of a composite coating structure formed by a SiO2 / stearic acid layer; a carbon fiber reinforced composite material is used as a matrix, a SiO2 layer is deposited on the surface of the carbon fiber matrix by a cathode plasma deposition technology, and a SiO2 / stearic acid layer prepared by a water bath deposition method is used as an outer layer, so that on one hand, the SiO2 on the outer layer can seal and fill pores in the surface of the carbon fiber matrix, and on the other hand, the stearic acid on the outer layer ensures that the outer layer has super-hydrophobicity; therefore, the dual-function coating not only has an efficient super-hydrophobic effect on the surface of the carbon fiber reinforced composite material, but also has a long-acting corrosion-resistant effect on the carbon fiber reinforced composite material.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of carbon fiber reinforced composite surface high-efficiency super-hydrophobic / anti-corrosion dual function coating, belong to material surface corrosion protection technical field. BACKGROUND

[0002] Carbon fiber reinforced composite material is a kind of composite structural material composed of epoxy resin matrix and carbon fiber reinforcement, which has high specific strength / specific modulus, excellent fatigue resistance, small thermal expansion coefficient, stable structure size, corrosion resistance and other characteristics, can partially replace metal materials, as load-bearing structural parts can be widely used in national defense, aerospace, rail transportation, construction and other fields.But in the process of material processing, storage and use, under the action of heat, oxygen, moisture, ultraviolet and other environmental factors, the interface structure and overall performance of carbon fiber reinforced composite material are greatly affected, especially in coastal areas, high humidity, high salt fog, high temperature environment can cause strong corrosion damage to the material, seriously affect its service safety.

[0003] Constructing an anti-corrosion coating with super-hydrophobic properties on the surface of carbon fiber reinforced composites can greatly reduce or prevent the infiltration of corrosive media, thereby further slowing down the corrosion of composite materials and increasing the service life of carbon fiber reinforced composites. The anti-corrosion principle of super-hydrophobic coatings is mainly due to the fact that super-hydrophobic coatings often have a peak-valley roughness structure. The air trapped in the rough structure can block the penetration of corrosive ions (such as chloride ions), preventing them from reaching the surface of the substrate, thereby improving its corrosion resistance. In addition, on the super-hydrophobic surface, due to the presence of micro-nano-scale roughness, the inner diameter of the pores or the spacing between the gaps is very small. Due to the effect of Laplace pressure, corrosive liquids cannot penetrate into the pores or gaps of the super-hydrophobic coating, thereby effectively improving the corrosion resistance of the coating. For example, "Study on the Structural Properties of Silicon-Doped Hydroxyapatite Coatings Deposited by Cathodic Plasma Electrolytic Deposition on Carbon / Carbon Composite Surfaces" (Wang Hairui, Journal of Jilin Normal University, 2020) uses a pulsed power supply for the cathode plasma electrolytic deposition process, and the temperature of the electrolyte is maintained below 30°C during the reaction. A C / C specimen was used as the cathode, and a stainless steel electrolytic cell equipped with a stirring and cooling system was used as the anode. A calcium-deficient bone apatite coating composed of a mixture of Si-doped hydroxyapatite and tricalcium phosphate was prepared. The coating exhibited a complete overall structure, no cracks, good adhesion to the substrate, and excellent mechanical properties. "Study on the Preparation and Corrosion Resistance of a Hydrophobic Surface of 7050 Aluminum Alloy" (Dai Weili, Shangluo, Shangluo University, 2024) employed a hydrophobic treatment of the 7050 aluminum alloy surface using a stearic acid-ethanol aqueous solution, resulting in a contact angle of 137.83°. After hydrochloric acid etching and stearic acid modification, the self-corrosion current density of the hydrophobic 7050 aluminum alloy decreased by two orders of magnitude, while the self-corrosion voltage increased by 0.075 V, indicating improved corrosion resistance. In summary, the coating prepared by cathode plasma deposition and the incorporation of stearic acid can impart hydrophobicity and corrosion resistance to the material surface, but its performance still has room for improvement. Summary of the Invention

[0004] In view of this, the present invention provides a high-efficiency super-hydrophobic / anti-corrosion dual-functional coating on the surface of a carbon fiber reinforced composite material. The carbon fiber reinforced composite material is used as a matrix, the surface of the carbon fiber matrix is ​​modified by cathode plasma deposition technology, and a SiO2 / stearic acid layer prepared by a water bath deposition method is used as an outer layer. On the one hand, the SiO2 in the inner layer can fill the pores of the carbon fiber reinforced composite material matrix, and on the other hand, the stearic acid in the outer layer ensures that the outer layer has super-hydrophobicity. Therefore, the dual-functional coating not only has a high-efficiency super-hydrophobic effect on the surface of the carbon fiber reinforced composite material matrix, but also can have a long-lasting corrosion-resistant effect on the carbon fiber reinforced composite material matrix.

[0005] The objectives of the present invention are achieved through the following technical solutions.

[0006] The application discloses a high-efficiency super-hydrophobic / anti-corrosion double-function coating on the surface of a carbon fiber reinforced composite material, which is a composite coating structure formed by a SiO2 / stearic acid layer.

[0007] The SiO2 / stearic acid layer is prepared by a water bath deposition method, and the molar concentration ratio of SiO2 to stearic acid in a precursor solution used in the water bath deposition is 3.9:1-6.1:1.

[0008] Further, the carbon fiber reinforced composite material substrate is selected.

[0009] Further, when the cathode plasma deposition technology is used, a Na2SiO3 solution with a concentration of 1.05-1.51 mol / L is used as an electrolyte solution.

[0010] Further, when the carbon fiber substrate surface is modified by using the cathode plasma deposition technology, the carbon fiber reinforced composite material substrate is used as a cathode, a high-frequency direct current power supply is used to apply a voltage of 90-140 V between the cathode and an anode for cathode plasma deposition, and the cathode plasma deposition time is more preferably 140-220 s.

[0011] Further, when the carbon fiber substrate surface is modified by using the cathode plasma deposition technology, after the cathode plasma deposition treatment is completed, the carbon fiber reinforced composite material substrate is placed in a vacuum drying oven at 50-90 DEG C for 50-80 min.

[0012] Further, when the SiO2 / stearic acid layer is prepared by using the water bath deposition method, the precursor solution is prepared from SiO2, stearic acid, water, anhydrous ethanol and a conductive salt, and the volume ratio of water to anhydrous ethanol is 1:1-3:2.

[0013] Further, the molar concentration of SiO2 in the precursor solution is 0.09-0.44 mol / L.

[0014] Further, when the SiO2 / stearic acid layer is prepared by using the water bath deposition method, after the deposition is completed, the carbon fiber reinforced composite material substrate is placed in a vacuum drying oven at 60-90 DEG C for 50-80 min.

[0015] Beneficial effects:

[0016] (1) When the SiO2 layer is prepared by using the cathode plasma deposition method, the carbon fiber reinforced composite material surface is physically etched and chemically activated by using plasma discharge, and by adjusting the discharge parameters, the number of active sites and the roughness of the substrate surface are improved, a stable and tightly combined SiO2 bottom layer is formed, and the uniformity and durability of the final composite coating are ensured.

[0017] (2) In the process of preparing the SiO2 / stearic acid layer by the water bath deposition method of the present invention, stearic acid improves the wettability of the precursor solution to the surface of the carbon fiber reinforced composite material matrix through its surfactant effect and wetting effect. Some stearic acid molecules are adsorbed on the surface of the deposited layer with their hydrophobic long-chain hydrocarbon groups facing outward, forming a hydrophobic film, which can reduce the surface free energy of the deposited layer and make it have super hydrophobic properties; and SiO2 combines with the matrix by filling the pores in the carbon fiber reinforced composite material matrix to form a dense physical barrier, thereby enhancing the corrosion resistance of the deposited layer.

[0018] (3) When the SiO2 / stearic acid layer is prepared by the water bath deposition method of the present invention, the ratio of SiO2 to stearic acid must be strictly controlled. When SiO2 and stearic acid are co-deposited, an inappropriate ratio of the two will reduce the effect of stearic acid on improving the hydrophobicity.

[0019] (4) When the present invention adopts the water bath deposition method to prepare the SiO2 / stearic acid layer, water and anhydrous ethanol are used as a mixed solvent, and the ratio of the two is regulated, which is conducive to the dissolution of stearic acid, forming a stable and uniform SiO2 / stearic acid uniform mixed solution, and is more conducive to the formation of a uniform SiO2 / stearic acid layer during the deposition process.

[0020] In summary, the dual-function coating described in the present invention not only has an efficient superhydrophobic effect, but also has a long-lasting corrosion-resistant effect on the carbon fiber reinforced composite matrix. Moreover, the water bath deposition technology adopted has a simple preparation method, controllable reaction, and good repeatability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the X-ray diffraction (XRD) pattern of the high-efficiency superhydrophobic / anti-corrosion dual-functional coating prepared on the surface of the carbon fiber substrate in Example 1.

[0022] Figure 2 This is a scanning electron microscope (SEM) image of the high-efficiency superhydrophobic / anti-corrosion dual-functional coating prepared on the surface of the carbon fiber substrate in Example 1.

[0023] Figure 3 This is a contact angle test result diagram of the high-efficiency superhydrophobic / anti-corrosion dual-functional coating prepared on the surface of the carbon fiber substrate in Example 1.

[0024] Figure 4 This is the impedance spectrum of the high-efficiency superhydrophobic / anti-corrosion dual-functional coating prepared on the surface of the carbon fiber substrate in Example 1.

[0025] Figure 5 This is the Bode plot of the high-efficiency superhydrophobic / anti-corrosion dual-functional coating prepared on the surface of the carbon fiber substrate in Example 1.

[0026] Figure 6 Long-term corrosion resistance impedance graph of the high-efficiency super-hydrophobic / anti-corrosion dual-functional coating prepared on the surface of the carbon fiber substrate for Example 1 after being immersed in seawater for 30 days.

[0027] Figure 7 Contact angle test result graph of the high-efficiency super-hydrophobic / anti-corrosion dual-functional coating prepared for Example 2.

[0028] Figure 8 Impedance spectrum of the high-efficiency super-hydrophobic / anti-corrosion dual-functional coating prepared on the surface of the carbon fiber substrate for Example 3.

[0029] Figure 9 Contact angle test result graph of the high-efficiency super-hydrophobic / anti-corrosion dual-functional coating prepared on the surface of the carbon fiber substrate for Example 4.

[0030] Figure 10 Contact angle test result graph of the high-efficiency super-hydrophobic / anti-corrosion dual-functional coating prepared on the surface of the carbon fiber substrate for Example 5.

[0031] Figure 11 Contact angle test result graph of the composite coating prepared on the surface of the carbon fiber substrate for Comparative Example 1.

[0032] Figure 12 Contact angle test result graph of the composite coating prepared on the surface of the carbon fiber substrate for Comparative Example 2.

[0033] Figure 13 Scanning electron microscope graph of the composite coating prepared on the surface of the carbon fiber substrate for Comparative Example 3.

[0034] Figure 14 Scanning electron microscope graph of the composite coating prepared on the surface of the carbon fiber substrate for Comparative Example 4. DETAILED DESCRIPTION

[0035] The present application is further described below in conjunction with the specific embodiments, wherein the methods are all conventional methods unless otherwise specified, and the raw materials are all available from public commercial channels unless otherwise specified.

[0036] In the following examples:

[0037] Sodium chloride and sodium metasilicate are both analytical pure (AR), Sinopharm Chemical Reagent;

[0038] Silicon dioxide: diameter 60-250 nm, Buhler;

[0039] Stearic acid: purity 99%, Damas-beta;

[0040] Anhydrous ethanol: purity ≥99.5%, Sigma-Aldrich;

[0041] Seawater: shallow surface water of the Yellow Sea in Yantai, China;

[0042] High-frequency DC power supply: TN-KGZ01, Yangzhou Shuanghong Electronics Co., Ltd.

[0043] Constant temperature water bath: HWS-26, Shanghai Yiheng Scientific Instrument Co., Ltd.

[0044] Vacuum drying oven: DZF-6020, Shanghai Yiheng Scientific Instrument Co., Ltd.

[0045] Contact angle measuring instrument: JC2000C1, Shanghai Zhongchen Digital Technology Equipment Co., Ltd.

[0046] Scanning electron microscope (SEM): JSM-7610F, JEOL, Japan;

[0047] X-ray diffractometer (XRD): Shimadzu XRD-7000, Japan;

[0048] Electrochemical workstation: CHI600E, Shanghai Chenhua Instrument Co., Ltd.

[0049] Example 1

[0050] (1) The carbon fiber reinforced composite material substrate was processed into a rectangular parallelepiped with a size of 10 mm × 25 mm × 3 mm as the substrate, and was polished with 400#, 800#, 1200#, 1500#, and 2000# sandpaper in sequence, and polished to remove scratches and sharp points on the substrate surface, and then blown dry to complete the pretreatment of the substrate;

[0051] (2) preparing 300 mL of a Na2SiO3 solution having a concentration of 1.36 mol / L and using it as an electrolyte solution; using the carbon fiber substrate pretreated in step (1) as a cathode and a stainless steel plate as an anode; applying a voltage of 110 V between the cathode and the cathode by a high-frequency DC power supply and treating for 180 seconds, and then placing the carbon fiber substrate after cathode plasma deposition in a vacuum drying oven at 60°C for 1 hour to obtain a carbon fiber reinforced composite material with a smooth and uniform surface;

[0052] (3) Water and anhydrous ethanol are used as a mixed solvent in a volume ratio of 3:2, and 30 mL of a mixed solution containing 0.22 mol / L SiO2, 0.046 mol / L stearic acid and 0.57 mol / L NaCl is prepared and used as a precursor solution; the carbon fiber matrix obtained in step (2) is immersed in a constant temperature 60°C solution for water bath deposition, and the deposition time is 3 h. Thereafter, the carbon fiber matrix is ​​taken out from the precursor solution, blown dry, and then placed in an 80°C drying oven for curing for 1 h, thereby forming a SiO2 / stearic acid layer on the matrix, thereby completing the preparation of a high-efficiency superhydrophobic / anti-corrosion dual-functional coating on the surface of the carbon fiber composite material.

[0053] from Figure 1 The XRD diagram in the figure shows that C, SiO2 and other phases are distributed on the surface of the carbon fiber composite matrix. Figure 2 It can be seen from the SEM image that the lamellar substance deposited on the surface of the carbon fiber reinforced composite material is stearic acid, and the surface morphology of the coating is smooth and dense, which proves that the SiO2 / stearic acid layer composite coating is successfully prepared on the surface of the carbon fiber matrix.

[0054] The prepared high-efficiency super-hydrophobic / anti-corrosion dual-functional coating was tested using a contact angle meter, and the contact angle of the coating was measured to be 136°, indicating that the coating has good hydrophobicity. Figure 3 shown.

[0055] from Figure 4 and Figure 5 It can be seen that after the high-efficiency superhydrophobic / anti-corrosion dual-functional coating is prepared on the carbon fiber surface, the carbon fiber impedance value is 4.1Ω cm 2 , the impedance value is large and the maximum phase angle appears in the higher frequency region, showing good corrosion resistance.

[0056] according to Figure 6 The corrosion resistance test results show that after the high-efficiency superhydrophobic / anti-corrosion dual-functional coating is prepared on the carbon fiber surface, the impedance value (log|Z| 0.01Hz ) is maintained at 3.8Ωcm 2 It can be seen that the prepared coating has long-term corrosion resistance and has a good corrosion protection effect on the carbon fiber matrix for a long time.

[0057] Example 2

[0058] (1) The carbon fiber reinforced composite material substrate was processed into a rectangular parallelepiped with a size of 10 mm × 25 mm × 3 mm as the substrate, and was polished with 400#, 800#, 1200#, 1500#, and 2000# sandpaper in sequence, and polished to remove scratches and sharp points on the substrate surface, and then blown dry to complete the pretreatment of the substrate;

[0059] (2) preparing 300 mL of a Na2SiO3 solution having a concentration of 1.09 mol / L and using it as an electrolyte solution; using the carbon fiber substrate pretreated in step (1) as a cathode and a stainless steel plate as an anode; applying a voltage of 110 V between the cathode and the cathode by a high-frequency DC power supply and treating for 180 seconds, and then placing the carbon fiber substrate after cathode plasma deposition in a vacuum drying oven at 50°C for 50 minutes to obtain a carbon fiber reinforced composite material having a smooth and uniform surface after treatment;

[0060] (3) Water and anhydrous ethanol are used as a mixed solvent in a volume ratio of 1:1, and 30 mL of a mixed solution containing 0.09 mol / L SiO2, 0.023 mol / L stearic acid and 0.17 mol / L NaCl is prepared and used as a precursor solution; the carbon fiber matrix obtained in step (2) is immersed in a constant temperature 50°C solution for water bath deposition, and the deposition time is 2 h. Thereafter, the carbon fiber matrix is ​​taken out from the water bath solution, blown dry, and then placed in a 60°C drying oven for curing for 30 min, thereby forming a SiO2 / stearic acid layer on the matrix, thereby completing the preparation of a high-efficiency superhydrophobic / anti-corrosion dual-functional coating on the surface of the carbon fiber composite material.

[0061] The prepared high-efficiency super-hydrophobic / anti-corrosion dual-functional coating was tested using a contact angle meter, and the contact angle of the coating was measured to be 130°, indicating that the coating has good hydrophobicity. Figure 7 shown.

[0062] After testing, it was found that after the high-efficiency super-hydrophobic / anti-corrosion dual-functional coating was prepared on the carbon fiber surface in this embodiment, the carbon fiber impedance value was 3.7Ω cm 2 , good corrosion resistance.

[0063] In this example, after a high-efficiency superhydrophobic / anti-corrosion dual-functional coating was prepared on the surface of the carbon fiber, the impedance value (log|Z| 0.01Hz ) is maintained at 3.3Ω cm 2 It can be seen that the prepared coating has long-term corrosion resistance and has a good corrosion protection effect on the carbon fiber matrix for a long time.

[0064] Example 3

[0065] On the basis of Example 1, except that the volume ratio of water to anhydrous ethanol in the electrolyte in step (3) was changed to 1:1, the other steps and conditions were the same as those in Example 1, and accordingly, a high-efficiency superhydrophobic / anti-corrosion dual-functional coating was formed on the surface of the carbon fiber reinforced composite material.

[0066] The prepared high-efficiency super-hydrophobic / anti-corrosion dual-functional coating was tested using a contact angle meter, and the contact angle of the coating was measured to be 127°, indicating that the coating has good hydrophobicity.

[0067] After testing, it was found that after the high-efficiency super-hydrophobic / anti-corrosion dual-functional coating was prepared on the carbon fiber surface in this embodiment, the carbon fiber impedance value was 3.7Ω cm 2 , good corrosion resistance, such as Figure 8 shown.

[0068] In this example, after a high-efficiency superhydrophobic / anti-corrosion dual-functional coating was prepared on the surface of the carbon fiber, the impedance value (log|Z| 0.01Hz ) is maintained at 3.2Ω cm 2 It can be seen that the prepared coating has long-term corrosion resistance and has a good corrosion protection effect on the carbon fiber matrix for a long time.

[0069] Example 4

[0070] On the basis of Example 1, except that the temperature of the water bath deposition in step (3) is changed to 70°C and the deposition time is changed to 4 hours, the other steps and conditions are the same as those in Example 1, and a high-efficiency superhydrophobic / anti-corrosion dual-functional coating is formed on the carbon fiber surface accordingly.

[0071] The prepared high-efficiency super-hydrophobic / anti-corrosion dual-functional coating was tested using a contact angle meter, and the contact angle of the coating was measured to be 125°, indicating that the coating has good hydrophobicity. Figure 9 shown.

[0072] After testing, it was found that after the high-efficiency super-hydrophobic / anti-corrosion dual-functional coating was prepared on the carbon fiber surface in this embodiment, the carbon fiber impedance value was 3.1Ω cm 2 , good corrosion resistance.

[0073] In this example, after a high-efficiency superhydrophobic / anti-corrosion dual-functional coating was prepared on the surface of the carbon fiber, the impedance value (log|Z| 0.01Hz ) is maintained at 2.9Ω cm 2 It can be seen that the prepared coating has long-term corrosion resistance and has a good corrosion protection effect on the carbon fiber matrix for a long time.

[0074] Example 5

[0075] On the basis of Example 1, except for changing the concentration of SiO2 in the precursor solution of step (3) to 0.36 mol / L and the concentration of stearic acid to 0.070 mol / L, the other steps and conditions are the same as those in Example 1, and accordingly, a high-efficiency superhydrophobic / anti-corrosion dual-functional coating is formed on the carbon fiber surface.

[0076] The prepared high-efficiency super-hydrophobic / anti-corrosion dual-functional coating was tested using a contact angle meter, and the contact angle of the coating was measured to be 125°, indicating that the coating has good hydrophobicity. Figure 10 shown.

[0077] After testing, it was found that after the high-efficiency super-hydrophobic / anti-corrosion dual-functional coating was prepared on the carbon fiber surface in this embodiment, the carbon fiber impedance value was 3.0Ω cm 2 , good corrosion resistance.

[0078] In this example, after a high-efficiency superhydrophobic / anti-corrosion dual-functional coating was prepared on the surface of the carbon fiber, the impedance value (log|Z| 0.01Hz ) is maintained at 2.8Ω cm 2 It can be seen that the prepared coating has long-term corrosion resistance and has a good corrosion protection effect on the carbon fiber matrix for a long time.

[0079] Comparative Example 1

[0080] On the basis of Example 1, except that the concentration of SiO2 in the precursor solution in step (3) is modified to 0.03 mol / L and the concentration of stearic acid is modified to 0.012 mol / L, the other steps and conditions are the same as those in Example 1, and a composite coating is formed on the surface of the carbon fiber reinforced composite material accordingly.

[0081] The prepared composite coating was tested using a contact angle meter, and the contact angle of the composite coating was measured to be 114°. Figure 11 shown.

[0082] After testing, it was found that after the composite coating was prepared on the carbon fiber surface, the impedance value of the carbon fiber was 2.8Ωcm 2 .

[0083] Comparative Example 2

[0084] On the basis of Example 1, except that the volume ratio of water to anhydrous ethanol in the precursor solution in step (3) was changed to 5:2, the other steps and conditions were the same as those in Example 1, and a composite coating was formed on the surface of the carbon fiber accordingly.

[0085] The prepared composite coating was tested using a contact angle meter, and the contact angle of the composite coating was measured to be 119°. Figure 12shown.

[0086] After testing, it was found that after the composite coating was prepared on the carbon fiber surface, the impedance value of the carbon fiber was 2.7cm 2 .

[0087] According to the corrosion resistance test results, the impedance value (log|Z| 0.01Hz ) dropped to 2.2Ω cm 2 , which shows that the long-term corrosion resistance of the prepared coating is not good enough.

[0088] Comparative Example 3

[0089] On the basis of Example 1, except that the temperature of the water bath deposition in step (3) is changed to 80°C and the deposition time is changed to 5 hours, the other steps and conditions are the same as those in Example 1, and a composite coating is formed on the surface of the carbon fiber accordingly.

[0090] from Figure 13 It can be seen that the composite coating deposited on the carbon fiber surface is uneven and the carbon fiber matrix is ​​exposed.

[0091] The prepared high-efficiency superhydrophobic / anti-corrosion dual-functional coating was tested using a contact angle meter, and the contact angle of the coating was measured to be 104°.

[0092] After testing, it was found that after the composite coating was prepared on the carbon fiber surface, the impedance value of the carbon fiber was 2.1Ωcm 2 .

[0093] Comparative Example 4

[0094] On the basis of Example 1, except that the curing temperature after step (3) water bath deposition is changed to 120°C and the curing time is changed to 80 minutes, the other steps and conditions are the same as those in Example 1, and a composite coating is formed on the carbon fiber surface accordingly.

[0095] from Figure 14 It can be seen that the composite coating deposited on the carbon fiber surface is uneven and holes appear on the surface.

[0096] The prepared high-efficiency superhydrophobic / anti-corrosion dual-functional coating was tested using a contact angle meter, and the contact angle of the coating was measured to be 108°.

[0097] After testing, it was found that after the composite coating was prepared on the carbon fiber surface, the impedance value of the carbon fiber was 2.2Ωcm 2 .

[0098] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-efficiency super-hydrophobic / anti-corrosion dual-functional coating on the surface of carbon fiber reinforced composite materials, comprising a composite coating structure formed by SiO2 / stearic acid layers; The SiO2 / stearic acid layer is prepared by a water bath deposition method, wherein the molar concentration ratio of SiO2 to stearic acid in the precursor solution used in the water bath deposition is 3.9:1 to 6.1:

1.

2. The high-efficiency super-hydrophobic / anti-corrosion dual-function coating for the surface of a carbon fiber reinforced composite material according to claim 1, characterized in that: A carbon fiber reinforced composite matrix is ​​selected.

3. The high-efficiency super-hydrophobic / anti-corrosion dual-function coating for the surface of a carbon fiber reinforced composite material according to claim 1, characterized in that: The SiO2 layer deposited on the substrate is made using cathode plasma deposition technology.

4. The high-efficiency super-hydrophobic / anti-corrosion dual-function coating for the surface of a carbon fiber reinforced composite material according to claim 3, characterized in that: When a SiO2 layer is deposited on a substrate using cathode plasma deposition technology, a Na2SiO3 solution containing 1.05 mol / L to 1.51 mol / L is used as the electrolyte solution.

5. The high-efficiency super-hydrophobic / anti-corrosion dual-function coating for the surface of a carbon fiber reinforced composite material according to claim 4, characterized in that: When cathode plasma deposition technology is used to modify the surface of the carbon fiber matrix, the carbon fiber reinforced composite material matrix serves as the cathode, and a high-frequency DC power supply is used to apply a voltage of 90 to 140 V between the anode and cathode for cathode plasma deposition. The cathode plasma deposition time is more preferably 140 to 220 s.

6. The high-efficiency super-hydrophobic / anti-corrosion dual-function coating for the surface of a carbon fiber reinforced composite material according to any one of claims 1 to 5, characterized in that: When the SiO2 / stearic acid layer is prepared by a water bath deposition method, the precursor solution is prepared from SiO2, stearic acid, water, anhydrous ethanol and conductive salt, and the volume ratio of water to anhydrous ethanol is 1:1 to 3:

2.

7. The high-efficiency super-hydrophobic / anti-corrosion dual-function coating for the surface of a carbon fiber reinforced composite material according to claim 6, characterized in that: The molar concentration of SiO2 in the precursor solution is 0.09-0.44 mol / L.

8. The high-efficiency super-hydrophobic / anti-corrosion dual-function coating for the surface of a carbon fiber reinforced composite material according to claim 7, characterized in that: The conductive salt is NaCl, and the concentration of NaCl in the electrolyte is 0.15-0.65 mol / L.

9. The high-efficiency super-hydrophobic / anti-corrosion dual-function coating for the surface of a carbon fiber reinforced composite material according to claim 8, characterized in that: When the SiO2 / stearic acid layer is prepared by the water bath deposition method, the carbon fiber matrix is ​​immersed in a solution at a constant temperature of 50 to 70°C for water bath deposition, and the deposition time is 2 to 4 hours.

10. The high-efficiency super-hydrophobic / anti-corrosion dual-function coating for the surface of a carbon fiber reinforced composite material according to claim 1, characterized in that: When the SiO2 / stearic acid layer is prepared by the water bath deposition method, after the water bath deposition is completed, the carbon fiber reinforced composite material matrix is ​​placed at 60 to 90°C and vacuum dried for 50 to 80 minutes.

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