MXene-LDH composite material with autonomous corrosion inhibition function as well as preparation method and application of MXene-LDH composite material

Abstract

The invention discloses an MXene-LDH composite material with an autonomous corrosion inhibition function and a preparation method and application thereof, and belongs to the technical field of transition metal carbon / nitride.The unique two-dimensional structures of transition metal carbon / nitride (MXene) and double-layer metal hydroxide (LDH) are combined, and the MXene-LDH composite material and the double-layer metal hydroxide (LDH) synergistically exert the physical barrier effect; meanwhile, the corrosive ion Cl <-> is rapidly captured by utilizing the unique ion exchange capacity of LDH so as to delay corrosion; lDH is used as a nano container, MoO4 < 2-> is introduced as a corrosion inhibitor, and Zn < 2 + > is combined, so that the composite coating is endowed with excellent self-repairing capability, and MXene with excellent conductivity provides a foundation for the composite coating as an electromagnetic attenuation material. Finally, the MXene-LDH composite material with a two-dimensional sheet-shaped interlaced and staggered network structure is constructed, and a novel material with corrosion prevention, electromagnetic attenuation and corrosion inhibition self-repairing functions is obtained.

Description

Technical Field

[0001] This invention belongs to the field of transition metal carbide / nitride technology, specifically relating to an MXene-LDH composite material with autonomous corrosion inhibition function, its preparation method, and its application. Background Technology

[0002] MXene is a transition metal carbide / nitride with a two-dimensional layered structure, similar in structure to graphene, and is considered a promising alternative to graphene. It possesses abundant surface functional groups (-OH, -F, and -O, etc.), high metallic conductivity, low density, large specific surface area, and tunable physicochemical properties, making it a highly promising functional material. Its relatively high conductivity makes MXene more efficient than graphene in constructing conductive networks, but it also exhibits stronger conductive loss. However, excessively high conductivity can lead to impedance mismatch, causing a large amount of electromagnetic waves to be reflected at the surface, which is detrimental to electromagnetic attenuation. Furthermore, due to its functional and structural limitations, its applications in isolating external corrosive media, delaying corrosion, as a coating anti-corrosion filler, and achieving coating repair are restricted. These performance limitations make the multifunctionalization of MXene a pressing technical challenge.

[0003] The application number is CN202310393076.4, and the patent name is a flexible polyimide / MXene / silver nanoparticle composite film and its preparation method and application. MXene has excellent conductivity and plays an important role in electromagnetic shielding performance. However, its impedance mismatch makes it unable to achieve electromagnetic attenuation. In addition, the composite film has a porous and breathable structure and does not have the function of isolating external corrosive media.

[0004] The application number is CN202210190990.4, and the patent title is "A Multifunctional Durable Thin Film with a Layered Structure and its Preparation Method." In this patent, the conductive MXene layer serves as electromagnetic shielding, but due to impedance mismatch, it lacks electromagnetic attenuation capabilities.

[0005] The application number is CN202310775659.3, and the patent name is a honeycomb sandwich structure high temperature broadband absorbing composite material based on Ti3C2Tx MXene aerogel and its preparation method. In this patent, MXene exists in the form of loose porous aerogel. Although it has certain advantages in impedance matching, it does not have the function of isolating external corrosive media and delaying corrosion, and therefore cannot be used in anti-corrosion coatings or self-healing coatings.

[0006] The application number is CN202310635409.X, and the patent name is Flexible High Conductivity Composite Thin Film Based on MXene / Silver Nanowires and Its Preparation Method Thereof. MXene uses high conductivity to play a connecting role, but there is a problem of impedance mismatch, and its resistance to salt spray corrosion has not been designed and explored. Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides an MXene-LDH composite material with autonomous corrosion inhibition function, its preparation method, and its application. It combines the unique two-dimensional structure of transition metal carbides / nitrides (MXene) and double-layer metal hydroxides (LDH) to synergistically exert a physical barrier effect. Simultaneously, it utilizes the unique ion exchange capacity of LDH to rapidly capture corrosive ions Cl-, thereby delaying corrosion. Furthermore, it uses LDH as a nanocontainer to introduce MoO4. 2- As a corrosion inhibitor, combined with its own Zn 2+ This endows the composite coating with excellent self-healing capabilities, and MXene's superior conductivity provides a foundation for its use as an electromagnetic attenuation material. Ultimately, a two-dimensional sheet-like interwoven network structure of MXene-LDH composite material was constructed, resulting in a novel material with anti-corrosion, electromagnetic attenuation, and corrosion-inhibiting self-healing properties.

[0008] The objective of this invention is achieved through the following technical solution: An MXene-LDH composite material with autonomous corrosion inhibition function, wherein the MXene-LDH composite material has a three-dimensional framework structure of interwoven two-dimensional nanosheets, the diameter of the two-dimensional nanosheets is 20~30 μm, and the thickness of a single layer of two-dimensional nanosheets is 50~60 nm.

[0009] Application of an MXene-LDH composite material with autonomous corrosion inhibition function: The MXene-LDH composite material has a three-dimensional framework structure of two-dimensional nanosheets interwoven with a three-dimensional framework structure that can capture corrosion ions and load corrosion inhibitors, thus endowing the composite coating with excellent self-healing ability; The three-dimensional interlaced network structure with a large number of pores effectively improves impedance matching, while causing multiple scattering and reflection of incident waves, thereby enhancing the electromagnetic wave attenuation capability.

[0010] A method for preparing an MXene-LDH composite material with autonomous corrosion inhibition function includes the following steps: Step 1: Disperse a certain amount of zinc nitrate hexahydrate and cobalt nitrate hexahydrate in deionized water to obtain solution A; Step 2: Take a certain amount of Ti3C2T x MXene dispersion was dispersed in deionized water and diluted to obtain solution B; Step 3: Mix the solution of the same volume with solution B, and adjust the pH of the mixed solution to 9 using sodium hydroxide solution; Step 4: Continue stirring the reaction under a protective gas until complete precipitation. Separate the solution by high-speed centrifugation, take the lower layer of precipitate and wash it repeatedly with water / ethanol, and collect the precipitate product. Step 5: Vacuum dry the obtained sample to obtain MXene / Zn sample. x Co-NO3; Step 6: Take a certain amount of MXene / Zn x Co-NO3 sample was dispersed in sodium molybdate solution and continuously stirred magnetically for a period of time. After the ion exchange reaction was completed, the sample was centrifuged, washed, and dried to obtain the final product MXene / Zn. x Co-MoO4; Step 7: Add a certain amount of MXene / Zn x Co-MoO4 was dispersed in ethanol by ultrasonic treatment and then added to a certain amount of epoxy resin to obtain system A; Step 8: Add a certain amount of curing agent to system A, and stir continuously under vacuum to remove air bubbles to obtain a mixed system; Step 9: Apply the mixture evenly to Q235 steel and allow it to dry and cure at room temperature.

[0011] Preferably, in step one, the concentration of the zinc nitrate hexahydrate aqueous solution is 0.05~0.8 mmol / mL, the concentration of the cobalt nitrate hexahydrate aqueous solution is 0.05 mmol / mL, and the molar mass ratio of Zn(NO3)2·6H2O to Co(NO3)2·6H2O is 8:1~1:1.

[0012] Preferably, in step two, the diluted Ti3C2T x The concentration of MXene solution was 2.5 mg / mL.

[0013] Preferably, in step four, the centrifugation speed is 10,000 rpm and the centrifugation time is 5 min.

[0014] Preferably, in step five, the drying temperature is 60°C and the drying time is 24 hours.

[0015] Preferably, in step six, MXene / Zn x The Co-NO3 concentration was 2.5 mg / mL, and the MXene / Zn ratio was... x The molar ratio of Co-NO3 to sodium molybdate is 1:2, and the reaction time is 4 h.

[0016] Preferably, in step seven, MXene / Zn x The Co-MoO4 filler ratio is 0.1~10 wt%, and the ultrasonic time is 15 min.

[0017] Preferably, in step eight, the curing agent is any one of fatty amines, phthalic anhydride, and polyamide.

[0018] Preferably, in step eight, the mass ratio of curing agent to epoxy resin is 1:7, and the stirring time is 30 min.

[0019] Preferably, in step nine, the curing time is 72 hours.

[0020] The beneficial effects of this technical solution are as follows: I. The present invention provides an MXene-LDH composite material with autonomous corrosion inhibition function. The three-dimensional interlaced network structure formed by the interweaving of two-dimensional sheet materials can capture corrosion ions and can act as a nano-container to load corrosion inhibitors, thereby endowing the composite coating with excellent self-healing ability; the unique two-dimensional structure gives the coating excellent physical barrier function; the three-dimensional interlaced network structure with a large number of pores effectively improves impedance matching, while causing multiple scattering and reflection of incident waves, enhancing electromagnetic attenuation ability.

[0021] II. The MXene-LDH composite material with self-inhibiting corrosion function provided by this invention can simultaneously achieve electromagnetic attenuation performance and corrosion resistance. After being immersed in 3.5 wt% NaCl solution for 21 days, the material's impedance modulus still reaches as high as 9.310 × 10⁻⁶. 8 Ω·cm 2 The protection efficiency reaches 99.97%. Simultaneously, utilizing the unique ion exchange capacity of LDH, it promptly captures corrosive ions (Cl). - And loaded with MoO4 2- As a corrosion inhibitor, combined with LDH's own Zn 2+ This endows the composite coating with excellent self-healing capabilities.

[0022] III. The present invention provides an MXene-LDH composite material with autonomous corrosion inhibition function. The minimum attenuation value of the MXene-LDH-based material reaches -50 dB when the thickness is 2.8 mm, and its maximum effective bandwidth is 6.25 GHz.

[0023] IV. This invention provides a method for preparing an MXene-LDH composite material with self-inhibiting corrosion function. The prepared LDH has a distinct two-dimensional lamellar structure. Combined with the impermeability of MXene, when it is uniformly dispersed in a polymer resin, it fully exerts its "physical barrier" and "maze effect," prolonging the corrosion resistance of corrosive media (H2O, O2, Cl). -The diffusion path of the MXene-LDH composite material is slowed down, thus achieving corrosion protection. An ion exchange method was used to develop a self-inhibiting MXene-LDH composite material. Its three-dimensional interwoven network structure, formed by two-dimensional sheet-like materials, can capture corrosion ions, delay corrosion, and act as a nano-container to load corrosion inhibitors, thereby endowing the composite coating with excellent self-healing capabilities. The MXene-LDH composite material, with its highly porous three-dimensional interwoven network structure, effectively improves impedance matching and induces multiple scattering and reflection of incident waves, enhancing electromagnetic wave attenuation. Combined with its corrosion protection and self-healing functions, it can effectively extend the service life of functional materials. Attached Figure Description

[0024] Figure 1 Figure 1 shows a schematic diagram of the microstructure of the MXene-LDH materials obtained in Examples 1-3 of this invention; wherein: Figure 1a is a microscopic SEM image of MXene / Zn1Co-MoO4 and its precursors MXene / Zn1Co-NO3 and Zn1Co obtained in Example 1, Figure 2b is a microscopic SEM image of MXene / Zn2Co-MoO4 and its precursors MXene / Zn2Co-NO3 and Zn2Co obtained in Example 2, and Figure 3c is a microscopic SEM image of MXene / Zn4Co-MoO4 and its precursors MXene / Zn4Co-NO3 and Zn4Co obtained in Example 3.

[0025] Figure 2 Figure 1 is a schematic diagram of the elemental distribution of the MXene-LDH material obtained in Example 3 of the present invention; wherein, Figure 2a is a microscopic SEM image of MXene / Zn4Co-MoO4 obtained in Example 3, Figure 3b is the corresponding Zn elemental distribution diagram, Figure 4c is the corresponding Co elemental distribution diagram, Figure 5d is the corresponding Ti elemental distribution diagram, Figure 6e is the corresponding Mo elemental distribution diagram, and Figure 7f is the corresponding O elemental distribution diagram.

[0026] Figure 3 Figure a is a schematic diagram of the structural characterization of the MXene-LDH materials obtained in Examples 1-3 of this invention; wherein, Figure a is a Zn precursor obtained in Examples 1-3. x The infrared spectrum of Co, and Figure b shows the precursor MXene / Zn obtained in Examples 1-3. x Infrared spectra of Co-NO3, Figure c shows the MXene / Zn obtained in Examples 1-3. x The infrared spectrum of Co-MoO4, Figure d shows the infrared spectrum of the MXene / Zn4Co-MoO4 precursor obtained in Example 3, and Figure e shows the infrared spectrum of the Zn4 precursor obtained in Examples 1-3. x XRD diffraction pattern of Co, Figure f shows the precursor MXene / Zn obtained in Examples 1-3. xXRD diffraction patterns of Co-NO3, Figure g shows the MXene / Zn obtained in Examples 1-3. x The XRD diffraction pattern of Co-MoO4 is shown in Figure h, which is the XRD diffraction pattern of the precursor MXene / Zn4Co-MoO4 obtained in Example 3.

[0027] Figure 4 Figure 1 shows the XPS elemental analysis of the MXene-LDH material obtained in Example 3 of this invention. Figure 2 shows the high-resolution C 1s spectrum of MXene / Zn4Co-MoO4 obtained in Example 3; Figure 3 shows the high-resolution O 1s spectrum of MXene / Zn4Co-MoO4 obtained in Example 3; Figure 4 shows the high-resolution Ti 2p spectrum of MXene / Zn4Co-MoO4 obtained in Example 3; Figure 4 shows the high-resolution Zn 2p spectrum of MXene / Zn4Co-MoO4 obtained in Example 3; Figure 5 shows the high-resolution Co 2p spectrum of MXene / Zn4Co-MoO4 obtained in Example 3; and Figure 6 shows the high-resolution Mo 3d spectrum of MXene / Zn4Co-MoO4 obtained in Example 3.

[0028] Figure 5 Figure 1 shows the complex dielectric constant of the MXene-LDH materials obtained in Examples 1-3 of this invention; wherein, Figure 2a shows the real part of the complex dielectric constant when the filler ratio is 30 wt% in Examples 1-3, Figure 3b shows the imaginary part of the complex dielectric constant when the filler ratio is 30 wt% in Examples 1-3, and Figure 3c shows the dielectric loss tangent when the filler ratio is 30 wt% in Examples 1-3.

[0029] Figure 6 Figure 1 shows the electromagnetic attenuation performance of the MXene-LDH materials obtained in Examples 2 and 3 of this invention. Figure 2a shows the three-dimensional attenuation values ​​of the precursor MXene / Zn2Co-NO3 in Example 2 at different thicknesses and frequencies. Figure 3b shows the three-dimensional attenuation values ​​of MXene / Zn2Co-MoO4 in Example 2 at different thicknesses and frequencies. Figure 4c shows the three-dimensional attenuation values ​​of the precursor MXene / Zn4Co-NO3 in Example 3 at different thicknesses and frequencies. Figure 5d shows the three-dimensional attenuation values ​​of MXene / Zn4Co-MoO4 in Example 3 at different thicknesses and frequencies.

[0030] Figure 7Figure 1 shows the impedance matching characteristics and attenuation capability spectra of the MXene-LDH materials obtained in Examples 2 and 3 of this invention. Figure 2a shows the impedance matching spectrum of the precursor MXene / Zn2Co-NO3 in Example 2, Figure 3b shows the impedance matching spectrum of MXene / Zn2Co-MoO4 in Example 2, Figure 3c shows the impedance matching spectrum of the precursor MXene / Zn4Co-NO3 in Example 3, Figure 4d shows the impedance matching spectrum of MXene / Zn4Co-MoO4 in Example 3, and Figure 5e shows the attenuation constant (α) of Examples 2 and 3.

[0031] Figure 8 The following are electrochemical spectra of the salt spray corrosion resistance of the MXene-LDH coatings obtained in Examples 2-3 of this invention; wherein, Figure a shows the EIS impedance spectra of the Zn2Co-0.7 wt% coating after immersion in 3.5 wt% sodium chloride solution for 3, 7, 14, and 21 days; Figure b shows the EIS impedance spectra of the MXene / Zn2Co-NO3-0.7 wt% coating; Figure c shows the EIS impedance spectra of the MXene / Zn2Co-MoO4-0.7 wt% coating; Figure d shows the EIS impedance spectra of the Zn4Co-0.7 wt% coating; Figure e shows the EIS impedance spectra of the MXene / Zn4Co-NO3-0.7 wt% coating; Figure f shows the EIS impedance spectra of the MXene / Zn4Co-MoO4-0.7 wt% coating; Figure g shows the EIS impedance spectra of the pure epoxy coating; and Figure h shows the EIS impedance spectra of the coatings obtained in Examples 2-3 and the pure epoxy coating. f=0.01Hz The value is used as a function of immersion time. Figure i shows the potentiodynamic polarization curves of the coatings prepared in Examples 2-3 and the pure epoxy numerical coating after immersion in 3.5 wt% sodium chloride solution for 21 days. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to embodiments, but the implementation of the present invention is not limited thereto.

[0033] An MXene-LDH composite material with autonomous corrosion inhibition function and its preparation method, comprising the following steps: Step 1: Disperse 1-8 mmol of Zn(NO3)2·6H2O and 1 mmol of Co(NO3)2·6H2O into 20 mL of deionized water; Step 2: Take 10 mL of Ti3C2T x The MXene dispersion (5 mg / mL) was dispersed in 10 mL of deionized water for dilution. Step 3: Mix the two solutions and adjust the pH of the mixed solution to 9 using sodium hydroxide solution; Step 4: Continue stirring the reaction under nitrogen until complete precipitation. Separate the solution by high-speed centrifugation at 10,000 rpm, take the lower layer of precipitate and wash it repeatedly with water / ethanol, and collect the precipitate product. Step 5: The obtained sample was vacuum dried at 60℃ for 24 h to obtain the sample MXene / Zn. x Co-NO3; Step 6: Take 100 mg of MXene / Zn x Co-NO3 sample was dispersed in 40 mL of sodium molybdate (Na2MoO4) solution and continuously stirred magnetically for 4 h. After the ion exchange reaction was completed, the sample was centrifuged, washed, and dried to obtain the final product MXene / Zn. x Co-MoO4; Step 7: Add a certain amount of MXene / Zn x Co-MoO4 (0.3 wt%, 0.7 wt%, 10 wt%) was dispersed in 1 mL of ethanol by ultrasonic treatment and added to 1.4 g of epoxy resin; Step 8: Add 0.2 g of curing agent to the above system and stir continuously at 60°C under vacuum for 2 h to remove air bubbles; Step 9: Apply the mixture evenly to Q235 steel and allow it to dry and cure at room temperature for 72 hours.

[0034] Example 1 An MXene-LDH composite coating with self-inhibiting corrosion function and its preparation method, comprising the following steps: Step 1: Disperse 1 mmol of Zn(NO3)2·6H2O and 1 mmol of Co(NO3)2·6H2O into 20 mL of deionized water; Step 2: Take 10 mL of Ti3C2T x The MXene dispersion (5 mg / mL) was dispersed in 10 mL of deionized water for dilution. Step 3: Mix the two solutions and adjust the pH of the mixed solution to 9 using sodium hydroxide solution; Step 4: Continue stirring the reaction under nitrogen until complete precipitation. Separate the solution by high-speed centrifugation at 10,000 rpm, take the lower layer of precipitate and wash it repeatedly with water / ethanol, and collect the precipitate product. Step 5: The obtained sample was vacuum dried at 60℃ for 24 h to obtain the sample MXene / Zn. x Co-NO3; Step 6: Take 100 mg of MXene / Zn xCo-NO3 sample was dispersed in 40 mL of sodium molybdate (Na2MoO4) solution and continuously stirred magnetically for 4 h to complete the ion exchange reaction. Afterwards, the sample was centrifuged, washed, and dried. Centrifugation was performed at 6000 rpm for 10 min. The washing solution was a mixture of deionized water and chemically pure ethanol (volume ratio 2:1), and washing was performed by centrifugation at 3000 rpm for 10 min each time, repeated 3 times with a different solution each time. Drying was performed at 60℃ for 6 h. The final product MXene / Zn was obtained. x Co-MoO4; Step 7: Add a certain amount of MXene / Zn x Co-MoO4 (0.3 wt%, 0.7 wt%, 10 wt%) was dispersed in 1 mL of ethanol by ultrasonic treatment and added to 1.4 g of epoxy resin; Step 8: Add 0.2 g of curing agent to the above system. The curing agent is a fatty amine. Stir continuously at 60°C under vacuum for 2 h to remove air bubbles. Step 9: Apply the mixture evenly to Q235 steel and allow it to dry and cure at room temperature for 72 hours.

[0035] Example 2 An MXene-LDH composite coating with self-inhibiting corrosion function and its preparation method, comprising the following steps: Step 1: Disperse 2 mmol of Zn(NO3)2·6H2O and 1 mmol of Co(NO3)2·6H2O into 20 mL of deionized water; Step 2: Take 10 mL of Ti3C2T x The MXene dispersion (5 mg / mL) was dispersed in 10 mL of deionized water for dilution. Step 3: Mix the two solutions and adjust the pH of the mixed solution to 9 using sodium hydroxide solution; Step 4: Continue stirring the reaction under nitrogen until complete precipitation. Separate the solution by high-speed centrifugation at 10,000 rpm, take the lower layer of precipitate and wash it repeatedly with water / ethanol, and collect the precipitate product. Step 5: The obtained sample was vacuum dried at 60℃ for 24 h to obtain the sample MXene / Zn. x Co-NO3; Step 6: Take 100 mg of MXene / Zn xCo-NO3 sample was dispersed in 40 mL of sodium molybdate (Na2MoO4) solution and continuously stirred magnetically for 4 h to complete the ion exchange reaction. Afterwards, the sample was centrifuged, washed, and dried. Centrifugation time was 10 min. The washing solution was a mixture of deionized water and chemically pure ethanol (volume ratio 2:1), and washing was performed by centrifugation at 3000 rpm for 10 min each time, repeated 3 times with a different solution each time. Drying temperature was 60℃ and drying time was 7 h. The final product MXene / Zn was obtained. x Co-MoO4; Step 7: Add a certain amount of MXene / Zn x Co-MoO4 (0.3 wt%, 0.7 wt%, 10 wt%) was dispersed in 1 mL of ethanol by ultrasonic treatment and added to 1.4 g of epoxy resin; Step 8: Add 0.2 g of curing agent to the above system, wherein the curing agent is phthalic anhydride, and stir continuously at 60°C under vacuum for 2 h to remove air bubbles; Step 9: Apply the mixture evenly to Q235 steel and allow it to dry and cure at room temperature for 72 hours.

[0036] Example 3 An MXene-LDH composite coating with self-inhibiting corrosion function and its preparation method, comprising the following steps: Step 1: Disperse 4 mmol of Zn(NO3)2·6H2O and 1 mmol of Co(NO3)2·6H2O into 20 mL of deionized water; Step 2: Take 10 mL of Ti3C2T x The MXene dispersion (5 mg / mL) was dispersed in 10 mL of deionized water for dilution. Step 3: Mix the two solutions and adjust the pH of the mixed solution to 9 using sodium hydroxide solution; Step 4: Continue stirring the reaction under nitrogen until complete precipitation. Separate the solution by high-speed centrifugation at 10,000 rpm, take the lower layer of precipitate and wash it repeatedly with water / ethanol, and collect the precipitate product. Step 5: The obtained sample was vacuum dried at 60℃ for 24 h to obtain the sample MXene / Zn. x Co-NO3; Step 6: Take 100 mg of MXene / Zn xCo-NO3 sample was dispersed in 40 mL of sodium molybdate (Na2MoO4) solution and continuously stirred magnetically for 4 h to complete the ion exchange reaction. Afterwards, the sample was centrifuged, washed, and dried. Centrifugation time was 10 min. The washing solution was a mixture of deionized water and chemically pure ethanol (volume ratio 2:1), and washing was performed by centrifugation at 3000 rpm for 10 min each time, repeated 3 times with a different solution each time. Drying temperature was 60℃ and drying time was 8 h. The final product MXene / Zn was obtained. x Co-MoO4; Step 7: Add a certain amount of MXene / Zn x Co-MoO4 (0.3 wt%, 0.7 wt%, 10 wt%) was dispersed in 1 mL of ethanol by ultrasonic treatment and added to 1.4 g of epoxy resin; Step 8: Add 0.2 g of curing agent, wherein the curing agent is polyamide, to the above system and stir continuously at 60°C under vacuum for 2 h to remove air bubbles; Step 9: Apply the mixture evenly to Q235 steel and allow it to dry and cure at room temperature for 72 hours.

[0037] Example 4 An MXene-LDH composite coating with self-inhibiting corrosion function and its preparation method, comprising the following steps: Step 1: Disperse 8 mmol of Zn(NO3)2·6H2O and 1 mmol of Co(NO3)2·6H2O into 20 mL of deionized water; Step 2: Take 10 mL of Ti3C2T x The MXene dispersion (5 mg / mL) was dispersed in 10 mL of deionized water for dilution. Step 3: Mix the two solutions and adjust the pH of the mixed solution to 9 using sodium hydroxide solution; Step 4: Continue stirring the reaction under nitrogen until complete precipitation. Separate the solution by high-speed centrifugation at 10,000 rpm, take the lower layer of precipitate and wash it repeatedly with water / ethanol, and collect the precipitate product. Step 5: The obtained sample was vacuum dried at 60℃ for 24 h to obtain the sample MXene / Zn. x Co-NO3; Step 6: Take 100 mg of MXene / Zn xCo-NO3 sample was dispersed in 40 mL of sodium molybdate (Na2MoO4) solution and continuously stirred magnetically for 4 h to complete the ion exchange reaction. Afterwards, the sample was centrifuged, washed, and dried. Centrifugation time was 10 min. The washing solution was a mixture of deionized water and chemically pure ethanol (volume ratio 2:1), and washing was performed by centrifugation at 3000 rpm for 10 min each time, repeated 3 times with a different solution each time. Drying temperature was 60℃ and drying time was 6 h. The final product MXene / Zn was obtained. x Co-MoO4; Step 7: Add a certain amount of MXene / Zn x Co-MoO4 (0.3 wt%, 0.7 wt%, 10 wt%) was dispersed in 1 mL of ethanol by ultrasonic treatment and added to 1.4 g of epoxy resin; Step 8: Add 0.2 g of curing agent, wherein the curing agent is polyamide, to the above system and stir continuously at 60°C under vacuum for 2 h to remove air bubbles; Step 9: Apply the mixture evenly to Q235 steel and allow it to dry and cure at room temperature for 72 hours.

[0038] The MXene-LDH composite material with autonomous corrosion inhibition function obtained in this invention was characterized. The microstructure of MXene-LDH was characterized using scanning electron microscopy (SEM), and the elemental composition and distribution on its surface were analyzed using energy-dispersive spectroscopy (EDS). The structure of MXene-LDH was characterized using Fourier transform infrared spectroscopy (FT-IR) at a scanning resolution of 4 Å. The scan wavenumber range is 4000~400 The structure of MXene-LDH was characterized using Cu-Kα radiation X-ray diffraction (XRD), and its crystallization behavior was analyzed. The scanning speed was 5° / min, and the scanning range was 5°–80°. The chemical composition and bonding type of MXene-LDH were investigated using X-ray photoelectron spectroscopy (XPS) with a monochromatic Al-Kα X-ray source (1486.6 eV). The electromagnetic parameters of MXene-LDH were measured in the frequency range of 1.0–18.0 GHz using a vector network analyzer (3671D). Using the coaxial method, different mass percentages of MXene-LDH were uniformly mixed with paraffin and pressed to obtain coaxial rings with an inner diameter of 3.04 mm and an outer diameter of 7 mm. An electrochemical workstation was used in a classic three-electrode configuration, including a working electrode (exposed area of ​​1 cm²). 2 The electrode is made of coated Q235 steel, the reference electrode is made of saturated silver chloride, and the counter electrode is made of 4 cm² steel. 2The platinum sheet was used to fabricate the working electrode, and electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curve (PDP) were performed. The frequency range of the EIS measurement was [missing information]. Hz, AC signal amplitude is 10 mV.

[0039] During the preparation process, Zn 2+ Co 2+ Two-dimensional MXene (negatively charged) is uniformly adsorbed onto the lamellar surface through electrostatic interactions, effectively preventing interlayer aggregation of MXene. Simultaneously, the growth of two-dimensional LDH on the MXene surface facilitates the assembly of the three-dimensional interlaced framework. To observe the microstructure of the composite material, SEM characterization was performed, and the specific results are as follows: Figure 1 As shown. When Zn 2+ / Co 2+ When the molar ratio is 1, Zn1Co ( Figure 1 a) It exhibits an irregular polyhedral structure, varying in shape and size. And when Zn... 2+ / Co 2+ When the molar ratio increases to 2 or 4, Zn2Co ( Figure 1 b) and Zn4Co ( Figure 1 c) They all exhibit a two-dimensional layered structure with relatively large dimensions, around 20–30 μm. For example... Figure 1 As shown in a1~c1, the introduction of MXene into the ZnCo LDH composite reveals a completely different microstructure compared to pure LDH. Specifically, MXene / Zn1Co-NO3 exhibits an amorphous morphology (a mixture of particles and sheets) with relatively fragmented sizes. However, MXene / Zn2Co-NO3 and MXene / Zn4Co-NO3 clearly show a two-dimensional sheet structure, although their sizes are significantly smaller than those of Zn2Co / Zn4Co. Notably, the two-dimensional nanosheets are tightly connected and interwoven to form a three-dimensional framework structure with many large pores around them. Furthermore, before and after ion exchange, MXene / Zn... x Co-NO3 and MXene / Zn x The microstructure of Co-MoO4 did not differ significantly, presumably because the ion exchange reaction only occurs at the molecular level and does not have a substantial impact on the morphology. This, combined with other factors, suggests that when Zn... 2+ / Co 2+ When the molar ratio is 1, such as Figure 1 As shown in a1~a3, the materials all exhibit extremely irregular morphologies, indicating that this raw material ratio is not suitable for synthesizing LDH. When the molar ratio is further increased, the morphologies of ZnCo LDH and MXene / ZnCo LDH composites become significantly more regular, and both exhibit a two-dimensional lamellar structure.

[0040] Taking MXene / Zn4Co-MoO4 as an example, its elemental distribution was characterized, and the specific composition of the composite material was further analyzed. The results are as follows: Figure 2 As shown, Zn, Co, Ti, Mo, and O are uniformly distributed on the surface of this composite material. Zn, Co, Ti, and O originate from ZnCo LDH and Ti3C2T, respectively. x MXene proves the successful bonding between the two. The Mo element, on the other hand, originates from the introduced MoO4. 2- This indicates that the anion exchange of LDH was successfully achieved.

[0041] like Figure 3 The image shows the infrared spectrum and XRD pattern of each sample. Figure 3 As shown in figures a through d, it can be observed that all samples are around 3400 A wide frequency band can be observed everywhere, indicating the presence of water molecules in the LDH interlayer and the stretching vibration of the -OH group. Figure 3 a is Zn x The infrared spectrum of Co, at 1643 The absorption peak at 1385 is caused by the bending vibrations of water molecules adsorbed between the LDH layers, while at 1385... The strong peak at that point represents NO3. - The vibration mode. Furthermore, in the range of 1000~500... The absorption peaks within the range are considered to be caused by vibrational modes of metal-metal, metal-oxide, and metal hydroxide. After recombination with MXene, as... Figure 3 As shown in b, it is located at 1624. The peak at that location is attributed to the stretching vibration of the C=O bond in MXene and also belongs to NO3. - The absorption peak still exists and is located at 1381. Of course, when combined with MXene, in 507 The peak at that position is attributed to the deformation vibration of Ti-O. After ion exchange with molybdate, the spectrum is as follows: Figure 3 As shown in c, it exists in 1632. 503 The peaks at these locations still belong to C=O bonds and Ti-O bonds, respectively. In MXene / Zn x Co-NO3 is located at 1381 The strong absorption peak at that point has become very weak and tends to disappear, indicating that NO3... - Most of them have been infected with MoO4 2- The replacements were made, but some parts were not completely replaced. Figure 4-3d provides a more intuitive comparison of the absorption peaks of each material. In summary, this demonstrates that MXene has been successfully introduced into ZnCo LDH, and that MoO4... 2- It was also successfully loaded. Figure 3 e~h are the XRD patterns of each sample. For example... Figure 3 As shown in e, in Zn 2+ / Co 2+ At a molar ratio of 1, Zn1Co did not exhibit obvious diffraction peaks, indicating that the LDH layered crystal structure could not be formed well at this point, which is consistent with the SEM results. However, Zn2Co and Zn4Co exhibited the same diffraction peaks, which can be attributed to the unique diffraction peaks of LDH, proving the successful synthesis of ZnCo LDH. After recombination with MXene, MXene / Zn x Co-NO3 ( Figure 3 f) and MXene / Zn x Co-MoO4 ( Figure 3 The XRD patterns of the series of samples (g) were basically consistent, showing little influence from the molar ratio of the raw materials, except that when the molar ratio was 1, the diffraction peaks of the samples were significantly more disordered and the degree of disorder was higher. However, as... Figure 4-3 As shown in h, the XRD diffraction peaks did not change significantly after the introduction of MXene, indicating that the introduction of MXene did not affect the generation of LDH.

[0042] To further understand MXene / Zn x The structure of Co-MoO4, taking MXene / Zn4Co-MoO4 as an example, was studied using XPS energy dispersive spectroscopy to investigate its chemical bonding mechanism, such as... Figure 4 As shown, MXene / Zn4Co-MoO4 is mainly composed of Ti, C, Zn, Co, Mo, and O elements, consistent with the chemical composition of the corresponding raw materials. Further high-resolution spectra of each element were investigated to determine the structural composition of MXene / Zn4Co-MoO4. Figure 4 As shown in figure a, there are four distinct fitting peaks in C 1s, located at 281.90 eV, 284.80 eV, 286.61 eV, and 288.93 eV, respectively, corresponding to C-Ti, CC / C=C, CO, and C=O bonds. The C-Ti bond originates from Ti3C2T. x MXene, therefore, can be used to demonstrate the presence of Ti3C2T in this composite material. x MXene. O 1s high-resolution spectrum ( Figure 4 b) Three distinct peaks are observed at binding energies of 529.85 eV, 531.13 eV, and 533.09 eV, which are attributed to Zn-O / Co-O bonds and OH groups, respectively. −And the chemically adsorbed water between the LDH layers, from which we can conclude that we have successfully synthesized ZnCo LDH. Figure 4 High-resolution spectra of Ti 2p in the composite material showed five distinct fitting peaks. The two peaks at binding energies of 463.79 and 458.16 eV belonged to the Ti 2p 1 / 2 and Ti 2p 3 / 2 bonds in the Ti-O bond, respectively. Similarly, the two peaks for Ti-C 2p 1 / 2 and Ti-C 2p 3 / 2 were located at 460.37 and 454.59 eV, respectively, further indicating the presence of Ti3C2T in the composite material. x The presence of MXene. Furthermore, the peak at 455.99 eV is attributed to Ti. 2+ .like Figure 4 As shown in Figure d, in the high-resolution Zn 2p spectrum, Zn 2p 3 / 2 and Zn 2p 1 / 2 correspond to strong peaks at 1021.73 eV and 1044.82 eV, respectively, indicating the presence of Zn in MXene / Zn4Co-MoO4. 2+ Furthermore, the high-resolution spectrum of Co 2p exhibits two distinct strong peaks: one at 780.84 eV corresponding to Co 2p 3 / 2, and the other at 796.48 eV corresponding to Co 2p 1 / 2, which are attributed to Co 2p 3 / 2 and 1 / 2, respectively. 3+ and Co 2+ Additionally, satellite bands are observed near the two peaks, located at 785.60 eV and 802.54 eV respectively. Clearly, Co... 3+ The relative strength value is higher than that of Co. 2+ This indicates that Co in MXene / Zn4Co-MoO4 3+ The content is relatively high. The two main characteristic peaks at 235.20 eV and 232.13 eV in the Mo 3d spectrum correspond to Mo 3d 3 / 2 and Mo 3d 5 / 2, respectively. Figure 4 f), confirming Mo 6+ The XPS results above indicate that a large number of active functional groups exist on the surface of MXene / Zn4Co-MoO4. These functional groups can serve as active sites to improve the electromagnetic attenuation performance of the material.

[0043] Based on the morphological and structural characterization test results, Zn was excluded. 2+ / Co 2+ A series of samples with a molar ratio of 1:1 were tested. Electromagnetic attenuation performance tests were then conducted on samples with molar ratios of 2:1 and 4:1. The electromagnetic attenuation performance of the material mainly depends on its electromagnetic parameters, namely the complex permittivity and complex permeability, which are related to the dielectric loss and magnetic loss capability of electromagnetic waves, respectively. This composite material does not involve magnetism; therefore, the analysis primarily focuses on its dielectric properties. Figure 5Let be the real part, imaginary part, and tangent of the dielectric constant of MXene / ZnCo LDH. It can be observed that MXene / Zn... x Co-NO3 and MXene / Zn x The real and imaginary parts of the dielectric constant of Co-MoO4 (x=2, 4) are not significantly different, indicating that the dielectric properties of the samples are similar. This proves that with a fixed amount of MXene added, Zn 2+ / Co 2+ The molar ratio and the interlayer anions of LDH have little effect on the conductivity of the material. Secondly, such as Figure 5 As shown in c, MXene / Zn x Co-MoO4 compared to MXene / Zn x Co-NO3 has a larger dielectric loss tangent (tanδ) ε = ε″ / ε' This indicates that it has a slightly stronger ability to attenuate electromagnetic waves.

[0044] To further investigate the electromagnetic attenuation performance of MXene / ZnCo LDH, the attenuation values ​​of each sample were calculated, such as... Figure 6 As shown in the figure, the minimum attenuation values ​​of all samples are below -40 dB, indicating that they all have excellent electromagnetic attenuation performance. MXene / Zn2Co-NO3 has a minimum attenuation value of -40.63 dB at 10.18 GHz with a thickness of 3.4 mm; at the same time, its effective bandwidth is 5.60 GHz. MXene / Zn2Co-MoO4 has a minimum attenuation value of -46.83 dB (at 15.62 GHz) with a thickness of only 2.8 mm and an effective bandwidth of 6.70 GHz. MXene / Zn4Co-NO3 is similar. Among them, the sample with the best performance is MXene / Zn4Co-MoO4, with a minimum attenuation value of -49.93 dB at 15.45 GHz with a thickness of 2.8 mm and an effective bandwidth of 6.25 GHz.

[0045] The impedance matching performance and attenuation loss capability of a material simultaneously determine its electromagnetic wave attenuation performance. Therefore, to further investigate the impedance matching performance of the sample, |Z| was calculated. in The / Z0| value is explained, such as Figure 7 As shown. Figure 7 All samples shown in a~d exhibit good impedance matching, compared to MXene / Zn x Co-NO3, MXene / Zn x The impedance matching region of Co-MoO4 increases. This indicates that the ion exchange reaction of MoO4... 2−The introduction of this effectively increases the possibility of electromagnetic waves entering the material's interior, improving its impedance matching performance. Furthermore, the attenuation constant... α This is another important factor affecting electromagnetic wave attenuation performance. For example... Figure 7 As shown in e, MXene / Zn x Co-MoO4 α Far higher than MXene / Zn x Co-NO3, corresponding to impedance matching performance, indicates higher attenuation capability. In summary, considering both impedance matching performance and attenuation loss capability, MXene / Zn... x Co-MoO4 exhibits superior electromagnetic attenuation performance. The excellent microwave attenuation mechanism of MXene / ZnCo LDH is described in detail below. First, the three-dimensional MXene / ZnCo LDH forms an interconnected conductive network, accelerating electron migration and enhancing conductivity loss and electromagnetic wave energy attenuation. Second, the abundant functional groups and inherent defects of the two-dimensional layered MXene can induce dipole polarization and defect polarization under the action of high-frequency electromagnetic fields. At the same time, the recombination of MXene and LDH introduces additional interfacial polarization. In addition, the large number of pores in the three-dimensional framework further improves impedance matching, extends the microwave propagation path in the material, and the multiple reflections and scatterings between the MXene and LDH layers can further improve the electromagnetic attenuation efficiency.

[0046] This invention uses a filler ratio of 0.7 wt% as an example to prepare a composite coating. For example... Figure 8 The figure shows Bode plots of different coatings after immersion in 3.5 wt% NaCl solution for 3, 7, 14, and 21 days. Comprehensive analysis reveals that, regardless of whether it is the EP or composite coating, the impedance modulus |Z| increases with immersion time in 3.5 wt% NaCl solution. 0.01 Hz The overall trend is one of decreasing resistance modulus, because the corrosive medium slowly penetrates to the coating / steel interface, gradually deteriorating the coating's corrosion resistance. However, unlike the continuous decrease in EP (epistem resistance), the resistivity modulus of all composite coatings increases to some extent after 14 days of immersion. This indicates that the composite coating has a corrosion-inhibiting effect. The specific reason for this is that when the coating is immersed in NaCl solution, the corrosive ions Cl... - Once inside the coating, it is captured by LDH, undergoes ion exchange, and simultaneously displaces MoO4. 2- It has a corrosion-inhibiting effect, thereby suppressing the spread of corrosion. As the corrosive medium further erodes the material, LDH will gradually disintegrate and release a large amount of Zn. 2+ and MoO4 2- It plays a role in corrosion inhibition, reacting with Fe produced by corrosion. 2+ / Fe 3+ OH- After chelation, a dense protective film is formed and adsorbed onto the metal surface, preventing further erosion by corrosive media. Compared with ZnCo LDH, the performance of MXene / ZnCo LDH is significantly improved because MXene and ZnCo LDH exert a synergistic physical barrier effect after composite formation; while on the MoO4-supported... 2- Subsequently, MXene / Zn was further improved. x The self-healing properties of Co-MoO4 further enhance its anti-corrosion performance. Specifically, after immersion for 21 days, the resistivity modulus of MXene / Zn4Co-MoO4-0.7 wt% was the highest, at 9.310 × 10⁻⁶. 8 Ω·cm 2 The impedance modulus of EP is |Z|. 0.01 Hz =3.284×10 4 Ω·cm 2 After a 21-day immersion period, the impedance modulus of MXene / Zn4Co-MoO4-0.7 wt% was four orders of magnitude higher than that of EP, indicating its excellent corrosion resistance. The impedance moduli of other composite coatings were |Z| 0.01 Hz =8.630×10 6 6.035×10 7 4.930×10 8 1.636×10 7 8.260×10 7 Ω·cm 2 The values ​​are all higher than EP, indicating that the coating provides better protection to the metal substrate after the addition of filler. This is because the filler can make up for the inherent defects of the epoxy coating, block the penetration of corrosive media into the metal surface, and improve the anti-corrosion performance of the composite coating.

[0047] To further investigate the corrosion resistance and protective efficiency (IE) of the composite coating, Tafel curve tests were performed on bare steel and the coating after immersion in 3.5 wt% NaCl solution for 21 days. The results are as follows: Figure 8 As shown in Table i. A series of potentiodynamic polarization parameters were obtained using electrochemical analysis software, as shown in Table 1, representing the corrosion potential of bare Q235. E corrThe corrosion potential of the coating was -679.0 mV, while the corrosion potential of the other coatings shifted positively, indicating that the coating provides some protection to the bare steel. Furthermore, the lowest corrosion current density and the highest polarization resistance both came from the MXene / Zn4Co-MoO4-0.7 wt% system, further verifying its superior corrosion protection performance. Finally, the protection efficiency most directly reflects the protective effect of each coating. EP's protection efficiency was 56.02%, while MXene / Zn4Co-MoO4-0.7 wt% achieved the highest protection efficiency of 99.97%, providing excellent barrier performance. The protection efficiencies of other composite coatings were all above 90%. In conclusion, MXene / Zn4Co-MoO4-0.7 wt% exhibits the best corrosion resistance.

[0048]

[0049] Based on the above experimental results, the anti-corrosion mechanism can be summarized into the following three aspects: (1) MXene / ZnCo LDH has an obvious two-dimensional lamellar structure. Combined with the impermeability of MXene, when it is uniformly dispersed in epoxy resin, it fully exerts the "physical barrier" effect and "maze effect" to prolong the corrosion of corrosive media (H2O, O2, Cl). - The diffusion path of ) slows down the penetration rate. In addition, two-dimensional flakes can fill the inherent defects in epoxy coatings, repair pores and cracks, and further improve its physical barrier performance. (2) When corrosive ions Cl - When penetrating the coating / filler interface, ZnCo LDH exerts its unique ion exchange capacity, adsorbing / exchanging Cl- ions. - Capture and reduce the free migration of Cl in the coating - The concentration of [something] thus slows down corrosion. (3) When the corrosive medium (H2O, O2, Cl) [is present], the corrosion is slowed down. - When the Zn further diffuses through the coating interior to the coating / Q235 steel interface, corrosion occurs on the steel surface, which is divided into cathodic and anodic reactions. The occurrence of corrosion reactions leads to changes in the pH value inside the coating. Under acidic conditions, ZnCo LDH will gradually dissolve and release Zn. 2+ and interlayer anions MoO4 2- (Corrosion inhibitor). In the cathode region, Zn 2+ Can react with OH - It forms a deposit film and adsorbs onto the metal surface, blocking the intrusion path of corrosive media.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A MXene-LDH composite material with autonomous corrosion inhibition function, characterized in that: The MXene-LDH composite material has a three-dimensional framework structure with interwoven two-dimensional nanosheets. The diameter of the two-dimensional nanosheets is 20~30 μm, and the thickness of a single layer of two-dimensional nanosheets is 50~60 nm.

2. Use of MXene-LDH composite material with autonomous corrosion inhibition function, characterized in that: The MXene-LDH composite material has a three-dimensional framework structure with two-dimensional nanosheets interwoven, which can capture corrosion ions and load corrosion inhibitors, giving the composite coating excellent self-healing ability; the three-dimensional interlaced network structure with a large number of pores effectively improves impedance matching, while causing multiple scattering and reflection of incident waves, enhancing the electromagnetic wave attenuation capability.

3. A method for preparing an MXene-LDH composite material with self-inhibiting corrosion function, characterized in that, Includes the following steps: Step 1: Disperse a certain amount of zinc nitrate hexahydrate and cobalt nitrate hexahydrate in deionized water to obtain solution A; Step two, take a certain amount of Ti3C2T x MXene dispersion liquid is dispersed into deionized water for dilution to obtain solution B; Step 3: Mix the solution of the same volume with solution B, and adjust the pH of the mixed solution to 9 using sodium hydroxide solution; Step 4: Continue stirring the reaction under a protective gas until complete precipitation. Separate the solution by high-speed centrifugation, take the lower layer of precipitate and wash it repeatedly with water / ethanol, and collect the precipitate product. Step five, vacuum oven drying the obtained sample to get sample MXene / Zn x Co-NO3; Step six, take a certain amount of MXene / Zn x Co-NO3 sample is dispersed into sodium molybdate solution, and the ion exchange reaction is completed after magnetic stirring for a period of time, centrifugation, washing and drying, to obtain the final product MXene / Zn x Co-MoO4; Step seven, a certain amount of MXene / Zn x Co-MoO4, dispersed in ethanol by ultrasonic treatment, and added to a certain amount of epoxy resin to obtain system A; Step 8: Add a certain amount of curing agent to system A, and stir continuously under vacuum to remove air bubbles to obtain a mixed system; Step 9: Apply the mixture evenly to Q235 steel and allow it to dry and cure at room temperature.

4. The method for preparing an MXene-LDH composite material with self-inhibiting corrosion function according to claim 3, characterized in that: In step one, the concentration of zinc nitrate hexahydrate aqueous solution is 0.05~0.8 mmol / mL, the concentration of cobalt nitrate hexahydrate aqueous solution is 0.05 mmol / mL, and the molar mass ratio of Zn(NO3)2·6H2O to Co(NO3)2·6H2O is 8:1~1:

1.

5. The method for preparing an MXene-LDH composite material with self-inhibiting corrosion function according to claim 4, characterized in that: In the second step, the diluted Ti3C2T x The concentration of the MXene solution was 2.5 mg / mL.

6. The method for preparing an MXene-LDH composite material with self-inhibiting corrosion function according to claim 5, characterized in that: In step four, the centrifugation speed is 10,000 rpm and the centrifugation time is 5 min.

7. The method for preparing an MXene-LDH composite material with self-inhibiting corrosion function according to claim 6, characterized in that: In step five, the drying temperature is 60℃ and the drying time is 24 hours.

8. The method for preparing an MXene-LDH composite material with self-inhibiting corrosion function according to claim 7, characterized in that: In step six, MXene / Zn x Co-NO3 concentration was 2.5 mg / mL, MXene / Zn x The molar mass ratio of Co-NO3 to sodium molybdate was 1:2, and the reaction time was 4 h.

9. The method for preparing an MXene-LDH composite material with self-inhibiting corrosion function according to claim 8, characterized in that: In step seven, MXene / Zn x Co-MoO4filler ratio of 0.1-10 wt%, ultrasonic time of 15 min.

10. The method for preparing an MXene-LDH composite material with self-inhibiting corrosion function according to claim 9, characterized in that: The curing agent is any one of fatty amines, phthalic anhydride, and polyamide.

11. The method for preparing an MXene-LDH composite material with self-inhibiting corrosion function according to claim 10, characterized in that: In step eight, the mass ratio of curing agent to epoxy resin is 1:7, and the stirring time is 30 min.

12. The method for preparing an MXene-LDH composite material with self-inhibiting corrosion function according to claim 11, characterized in that: In step nine, the curing time is 72 hours.

Images