Ceramic coating marine cable connector and preparation method thereof

Abstract

The invention discloses a ceramic coating marine cable connector, which comprises a connector shell, a conductive pin and an end cover, a composite protective coating system is arranged on the outer surface of the connector shell and the matching surface of the end cover, and a metal protective coating is arranged on the contact surface of the conductive pin. According to the ceramic coating marine cable connector and the preparation method thereof, the problem of galvanic corrosion of dissimilar metal is effectively solved through micro-arc oxidation / electronickelling differentiation bottom layer treatment, physical barrier and intelligent response cooperative protection is achieved through the graphene composite middle layer, a complete protection system is formed in combination with the super-hydrophobic top layer, and the corrosion resistance of the connector is improved. And finally, while the bonding strength of the coating is ensured, the corrosion-resistant life and maintainability of the connector in a marine environment are remarkably improved.

Description

Technical Field

[0001] This application relates to the technical field of marine cable connectors, and more particularly to a ceramic-coated marine cable connector and its manufacturing method. Background Technology

[0002] Marine cable connectors are electrical connection devices specifically designed for marine environments. They are primarily used to achieve detachable and pluggable electrical connections between marine cables and between cables and marine engineering equipment (such as seabed observation equipment, offshore wind power platforms, ships, and subsea oil and gas extraction equipment). Their core function is to stably transmit electrical energy or various electrical signals (such as communication signals and monitoring data signals) under complex and harsh marine conditions, while providing mechanical fixation and environmental protection for the connection points, ensuring the continuous and reliable operation of the entire marine electrical system.

[0003] As a core component in fields such as submarine communication and offshore wind power, the reliability of marine cable connectors directly affects system stability. The combined effects of high salt corrosion, water flow abrasion, temperature fluctuations, and biological corrosion in the marine environment can easily trigger a vicious cycle of wear and corrosion, leading to connector failure and increased maintenance costs. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, one objective of this application is to provide a ceramic-coated marine cable connector and its preparation method. The method effectively solves the problem of galvanic corrosion of dissimilar metals through a differential underlayer treatment of micro-arc oxidation / electroplated nickel, utilizes a graphene composite intermediate layer to achieve synergistic protection of physical barrier and intelligent response, and combines it with a superhydrophobic top layer to form a complete protection system. Ultimately, while ensuring the coating bonding strength, it significantly improves the corrosion resistance life and maintainability of the connector in the marine environment.

[0006] To achieve the above objectives, the first aspect of this application provides a ceramic-coated marine cable connector, including a connector housing, conductive pins, and an end cap. A composite protective coating system is provided on the outer surface of the connector housing and the mating surface of the end cap, and a metal protective plating layer is provided on the contact surface of the conductive pins. The composite coating system comprises, from the inside out: Micro-arc oxidation ceramic substrate, which is directly formed on the surface of the connector housing, conductive pin, or end cap; A graphene-reinforced ceramic intermediate layer is provided, which covers the micro-arc oxidation ceramic substrate. A superhydrophobic and wear-resistant top layer is provided, which covers the graphene-reinforced ceramic intermediate layer.

[0007] In addition, the ceramic-coated marine cable connector and its manufacturing method proposed in this application may also have the following additional technical features: Furthermore, in the ceramic-coated marine cable connector, the connector housing is made of aluminum alloy, and the micro-arc oxidation ceramic underlayer is a ceramic layer generated in situ on the surface of the connector housing through a micro-arc oxidation process, with a thickness of 20-50 micrometers; The conductive pin is made of copper alloy, and the metal protective coating is a nickel layer formed by electroplating, with a thickness of 5-15 micrometers.

[0008] Furthermore, the graphene-reinforced ceramic interlayer comprises a ceramic matrix and functional components uniformly dispersed in the ceramic matrix, the functional components including: Graphene, wherein the graphene is functionalized with a silane coupling agent; The self-healing microcapsule comprises a wall material and a core material. The wall material of the self-healing microcapsule is a mixture of urea and formaldehyde resin, and the core material of the self-healing microcapsule is a mixture of epoxy resin and latent curing agent. The intelligent nanocontainer is composed of mesoporous silica nanoparticles, and the pores of the mesoporous silica nanoparticles are loaded with sodium molybdate corrosion inhibitors. pH fluorescent indicator, wherein the pH fluorescent indicator is uniformly dispersed in the ceramic matrix.

[0009] Furthermore, the self-healing microcapsule comprises a urea and formaldehyde resin wall material, and a core material encapsulated by the wall material, wherein the core material comprises epoxy resin and a latent curing agent; The pore openings of the mesoporous silica nanoparticles are capped by pH-responsive crown ether molecules. The pH fluorescence indicator is phenolphthalein.

[0010] Furthermore, the superhydrophobic and wear-resistant top layer is a composite layer of fluorosilicone resin and graphene nanosheets, wherein the mass of the graphene nanosheets is 0.5% to 2% of the mass of the fluorosilicone resin, and the thickness of the superhydrophobic and wear-resistant top layer is 5-10 micrometers.

[0011] The second aspect of this application provides a composite anti-corrosion treatment method for preparing ceramic-coated marine cable connectors, comprising the following steps: Surface pretreatment is performed on the connector housing, conductive pins, and end caps; Micro-arc oxidation treatment is applied to the connector housing and end cap made of aluminum alloy to form a micro-arc oxidation ceramic underlayer on its surface; The conductive pins made of copper alloy are electroplated with nickel, and then the nickel layer is subjected to micro-arc oxidation treatment. A graphene-reinforced ceramic intermediate layer is prepared on the micro-arc oxidation ceramic substrate of the connector housing, conductive pins and end caps by means of sol-gel process and spraying process; A superhydrophobic and wear-resistant top layer is prepared on the graphene-reinforced ceramic intermediate layer by a spraying process.

[0012] In addition, the ceramic-coated marine cable connector and its manufacturing method proposed in this application may also have the following additional technical features: Furthermore, the specific steps for preparing the graphene-reinforced ceramic interlayer include: The composite sol, by weight, comprises: 100 parts tetraethyl orthosilicate, 150-200 parts ethanol, 50-80 parts deionized water, 5-10 parts hydrochloric acid, 10-20 parts functionalized graphene oxide dispersion, 5-15 parts self-healing microcapsules, 2-5 parts intelligent nanocontainers, and 0.5-1 parts pH fluorescent indicator. The composite sol is uniformly coated onto the surface of the micro-arc oxidation ceramic substrate. Gradient heat treatment is performed: first, hold at 80℃ for 1 hour, then hold at 150℃ for 1 hour, and finally hold at 300℃ for 2 hours under nitrogen protection.

[0013] Furthermore, the self-healing microcapsules are prepared by in-situ polymerization, specifically by mixing epoxy resin with water and emulsifier and shearing at high speed to form an emulsion, then adding urea and formaldehyde aqueous solution, reacting at 55-65℃ for 2-4 hours under acidic catalytic conditions, and obtaining the self-healing microcapsules after filtration, washing and drying.

[0014] Further, the step of preparing the superhydrophobic wear-resistant top layer includes: mixing fluorosilicone resin and graphene nanosheets in ethyl acetate solvent at a mass ratio of 100:0.5 to 100:2, coating the mixture onto the surface of the graphene-reinforced ceramic intermediate layer by spraying, and curing it at 150°C for 1 hour.

[0015] Furthermore, the surface pretreatment step includes: sandblasting the workpiece with 100-200 mesh zirconium oxide sand, followed by ultrasonic cleaning in an alkaline degreasing agent and ethanol, and finally drying.

[0016] This application discloses a ceramic-coated marine cable connector and its preparation method. The method effectively solves the problem of galvanic corrosion of dissimilar metals through a differential underlayer treatment of micro-arc oxidation / electroplated nickel. It utilizes a graphene composite intermediate layer to achieve synergistic protection of physical barrier and intelligent response, and combines it with a superhydrophobic top layer to form a complete protection system. Ultimately, while ensuring the coating bonding strength, it significantly improves the corrosion resistance life and maintainability of the connector in the marine environment.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the composite coating system in a ceramic-coated marine cable connector according to this application; Figure 2 This is a structural schematic diagram of a ceramic-coated marine cable connector according to this application; Figure 3 This is a diagram showing the release rate of self-healing microcapsules in a ceramic-coated marine cable connector according to this application. Figure 4 This is a graph showing the electrochemical impedance change trend of the marine cable pin protective layer in a ceramic-coated marine cable connector according to this application over 30 days.

[0019] As shown in the figure: 1. Connector housing; 2. Conductive pin; 3. Aluminum alloy substrate; 4. Micro-arc oxidation ceramic bottom layer; 5. Smart nano-container; 6. Self-healing microcapsule; 7. pH fluorescent indicator; 8. Graphene-reinforced ceramic intermediate layer; 9. Superhydrophobic and wear-resistant top layer. Detailed Implementation

[0020] Embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. Rather, embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0021] The following description, in conjunction with the accompanying drawings, illustrates an embodiment of a ceramic-coated marine cable connector and its manufacturing method.

[0022] like Figures 1-4 As shown in the figure, a ceramic-coated marine cable connector according to an embodiment of this application includes a connector housing, conductive pins and end caps. A composite protective coating system is provided on the outer surface of the connector housing and the mating surface of the end caps, and a metal protective plating layer is provided on the contact surface of the conductive pins. The composite coating system includes, from the inside out: Micro-arc oxidation ceramic substrate: The micro-arc oxidation ceramic substrate is formed directly on the surface of the connector housing, conductive pins or end caps. Graphene-reinforced ceramic intermediate layer, which covers the micro-arc oxidation ceramic substrate; A superhydrophobic and wear-resistant top layer is applied over a graphene-reinforced ceramic intermediate layer.

[0023] Specifically, in actual use, the ceramic-coated marine cable connector achieves graded protection through the synergistic effect of its composite coating system across various structural layers.

[0024] When the connector is deployed in a marine environment, the outermost superhydrophobic and wear-resistant top layer plays a protective role. Its low surface energy characteristics allow seawater to form a protective film on the coating surface with a contact angle greater than 150° and a roll-off angle less than 10°, effectively reducing the actual contact area between the corrosive medium and the coating.

[0025] During long-term use, if microscopic defects appear on the surface due to mechanical damage, corrosive media can penetrate into the graphene-reinforced ceramic intermediate layer.

[0026] The graphene sheets in this layer form tortuous penetration paths in the ceramic matrix, significantly extending the diffusion distance of the corrosive medium.

[0027] Meanwhile, uniformly dispersed functionalized graphene inhibits crack propagation through interfacial effects, thereby improving the fracture toughness of the coating.

[0028] As the corrosive environment intensifies, the underlying micro-arc oxidation ceramic layer acts as the last line of defense. This layer forms a metallurgical bond with the metal substrate through in-situ growth, achieving a bond strength exceeding 30 MPa, effectively preventing coating peeling. Its dense α-Al₂O₃ ceramic phase provides excellent dielectric properties, with a volume resistivity exceeding 10¹² Ω·cm, which can block electron migration paths and inhibit electrochemical corrosion.

[0029] The superhydrophobic layer reduces media contact by about 85%, the intermediate layer reduces the media penetration rate to less than 1 / 5 of that of conventional coatings, and the bottom layer ensures that basic protection is maintained even in the event of local failure.

[0030] The gradient protection design enables the connector to exhibit excellent corrosion resistance in marine environments, improving the reliability of the connector in deep-sea environments.

[0031] In one embodiment of this application, the connector housing is made of aluminum alloy, and the micro-arc oxidation ceramic underlayer is a ceramic layer generated in situ on the surface of the connector housing by micro-arc oxidation process, with a thickness of 20-50 micrometers; The conductive pin is made of copper alloy, and the metal protective coating is a nickel layer formed by electroplating, with a thickness of 5-15 micrometers.

[0032] In the actual processing, differentiated solutions were designed for the aluminum alloy shell and copper alloy pins in the connector to solve the problem of galvanic corrosion.

[0033] Micro-arc oxidation treatment of aluminum alloy casing.

[0034] Process route: A silicate electrolyte is used to apply a bipolar pulsed electric field to the 6061 aluminum alloy shell (parameters: current density 12A / dm², frequency 1000Hz, processing time 25 minutes).

[0035] Results: A micro-arc oxidation ceramic layer with a thickness of 35±5μm was grown in situ on the substrate surface. Its main phases were α-Al2O3 (about 60%) and γ-Al2O3 (about 40%).

[0036] The ceramic layer has high resistivity (volume resistivity > 10¹² Ω·cm), which can effectively block the galvanic current path formed between the aluminum alloy shell (electrochemical potential approximately -0.8V vs. SCE) and the copper alloy pin (potential approximately -0.1V vs. SCE), thus inhibiting galvanic corrosion.

[0037] The in-situ grown ceramic layer forms a metallurgical bond with the substrate, with a bonding strength exceeding 30 MPa, thus preventing coating peeling due to poor bonding under ocean pressure fluctuations.

[0038] Nickel plating treatment for copper alloy conductive pins.

[0039] Process route: Watt's nickel electroplating process is used on the surface of H62 copper alloy pin (plating solution: nickel sulfate 240g / L, nickel chloride 45g / L, boric acid 35g / L; parameters: pH=4.2, temperature 55℃, current density 3A / dm²).

[0040] Results: A dense, non-porous nickel plating layer with a thickness of 10±2μm was obtained (surface roughness Ra≤0.8μm).

[0041] Copper alloys cannot produce a high-quality ceramic layer through micro-arc oxidation. Electroplating nickel is a compatible and mature surface treatment technology.

[0042] The electrochemical potential of metallic nickel lies between that of copper and aluminum alloys. As a transition layer, it can significantly reduce the potential difference of the copper-aluminum electrode pair and weaken the corrosion driving force.

[0043] The dense nickel layer provides an effective physical barrier for the copper substrate and also exhibits good corrosion resistance in marine environments.

[0044] In one embodiment of this application, the graphene-reinforced ceramic interlayer includes a ceramic matrix and functional components uniformly dispersed in the ceramic matrix, the functional components including: Graphene, graphene functionalized with silane coupling agents; Self-healing microcapsules consist of a wall material and a core material. The wall material of the self-healing microcapsule is a mixture of urea and formaldehyde resin, and the core material of the self-healing microcapsule is a mixture of epoxy resin and latent curing agent. The intelligent nanocontainer is composed of mesoporous silica nanoparticles, and sodium molybdate corrosion inhibitors are loaded in the pores of the mesoporous silica nanoparticles. pH fluorescent indicator, the pH fluorescent indicator is uniformly dispersed in the ceramic matrix.

[0045] The graphene-reinforced ceramic interlayer is a composite material system consisting of a continuous ceramic phase and multiple functional components.

[0046] Graphene-reinforced ceramic interlayers are composite materials prepared through sol-gel processes. Self-healing microcapsules, smart nanocontainers, functionalized graphene, and pH fluorescent indicators are uniformly and randomly distributed in the ceramic sol precursor through mechanical stirring and ultrasonic treatment.

[0047] Subsequently, it was gelled and heat-treated, and then solidified in a continuous ceramic matrix.

[0048] In this structure: The rupture of the self-healing microcapsule is triggered by a random encounter on the mechanical crack propagation path, and its location is related to the location where the crack appears.

[0049] The response of the smart nanocontainer is triggered by changes in the pH of its local area, and its location is related to the location where corrosion occurs.

[0050] The response mechanisms of the two functional components are independent of each other, and their random distribution in the matrix ensures that the corresponding repair or inhibition mechanism is triggered with a high probability, regardless of where the damage occurs.

[0051] Each component performs a different function in the coating system based on its inherent physical and chemical properties.

[0052] Component composition and basic functions.

[0053] Ceramic matrix: Serves as the structural basis of the coating, providing mechanical support, chemical inertness, and basic corrosion resistance.

[0054] Functionalized graphene: Surface modification with silane coupling agents improves its dispersibility and interfacial bonding in ceramic matrices.

[0055] Its two-dimensional sheet structure forms a physical barrier in the matrix, extending the diffusion path of corrosive media.

[0056] Self-healing microcapsules: These have a core-shell structure. The wall material is a mixture of urea and formaldehyde resin, and the core material is a mixture of epoxy resin and a latent curing agent. Their function is to achieve self-repair of cracks through the release and curing of the core material when the coating suffers mechanical damage.

[0057] Intelligent nanocontainers: Composed of mesoporous silica nanoparticles with sodium molybdate corrosion inhibitors loaded within their pores. This structure is designed to control the release of the inhibitors under specific environmental stimuli (such as pH changes).

[0058] pH fluorescent indicator: uniformly dispersed in the matrix, used to generate a visual signal response to changes in environmental pH caused by localized corrosion.

[0059] When the coating system is in a marine environment, in its intact state, the functionalized graphene and the ceramic matrix together form a physical barrier that prevents the penetration of environmental media.

[0060] Damage response stage: If the coating develops microcracks due to external stress, corrosive media will penetrate and cause corrosion of the base metal (usually accompanied by a local pH increase).

[0061] The self-healing microcapsules rupture under the stress field of the crack, releasing a repair agent to fill and seal the crack, restoring the physical integrity of the coating.

[0062] When the smart nanocontainer senses an increase in local pH, the sodium molybdate inhibitor within its pores begins to be released in a controlled manner, migrates to the metal surface to form a protective film, and inhibits the electrochemical corrosion process.

[0063] pH fluorescent indicators change color when they reach their response threshold, providing location information for subsequent detection and maintenance.

[0064] In one embodiment of this application, the self-healing microcapsule includes a urea and formaldehyde resin wall material and a core material encapsulated by the wall material, the core material including epoxy resin and a latent curing agent. The pore openings of mesoporous silica nanoparticles are capped by pH-responsive crown ether molecules; The pH fluorescent indicator is phenolphthalein.

[0065] Specifically, the self-healing microcapsules and urea-formaldehyde resin wall material possess optimized mechanical properties, ensuring effective rupture under coating crack stress. The non-aqueous core material, composed of epoxy resin and a latent curing agent, can form a stable cured product through a cross-linking reaction after release, achieving microcrack sealing and exhibiting superior stability compared to water-based systems in humid marine environments.

[0066] The intelligent nanocontainer, a mesoporous silica carrier, uses crown ether molecules to seal the pores. When the local pH value rises above 9.0 due to metal corrosion, the conformational change of the crown ether molecules causes the pores to open, achieving targeted release of sodium molybdate inhibitors.

[0067] Phenolphthalein, a pH fluorescent indicator, has a color change range (pH 8.2-10.0) that matches the microenvironmental changes in the early stages of metal corrosion. When the local pH value increases, phenolphthalein produces a color reaction and emits visible fluorescence under ultraviolet light, allowing early corrosion sites to be quickly identified and providing a basis for predictive maintenance.

[0068] In one embodiment of this application, the superhydrophobic and wear-resistant top layer is a composite layer of fluorosilicone resin and graphene nanosheets, wherein the mass of the graphene nanosheets is 0.5% to 2% of the mass of the fluorosilicone resin, and the thickness of the superhydrophobic and wear-resistant top layer is 5-10 micrometers.

[0069] Specifically, in this composite top layer, 0.5%-2% of graphene nanosheets form a continuous reinforcing network in fluorosilicone resin, which improves the wear resistance of the coating while maintaining superhydrophobic properties with a contact angle >150°.

[0070] The 5-10μm thickness design ensures structural integrity under deep-sea pressure environments, provides effective wear allowance, and avoids stress buildup caused by excessive thickness.

[0071] A composite anti-corrosion treatment method for preparing ceramic-coated marine cable connectors includes the following steps: Surface pretreatment is performed on the connector housing, conductive pins, and end caps; Micro-arc oxidation treatment is applied to the connector housing and end cap made of aluminum alloy to form a micro-arc oxidation ceramic underlayer on its surface; The conductive pins made of copper alloy are electroplated with nickel, and then the nickel layer is subjected to micro-arc oxidation treatment. A graphene-reinforced ceramic interlayer is prepared on the micro-arc oxidation ceramic substrate of the connector housing, conductive pins and end caps by means of sol-gel process and spraying process. A superhydrophobic and wear-resistant top layer is prepared on the graphene-reinforced ceramic intermediate layer by a spraying process.

[0072] The specific steps for preparing the graphene-reinforced ceramic interlayer include: The composite sol, by weight, comprises: 100 parts tetraethyl orthosilicate, 150-200 parts ethanol, 50-80 parts deionized water, 5-10 parts hydrochloric acid, 10-20 parts functionalized graphene oxide dispersion, 5-15 parts self-healing microcapsules, 2-5 parts intelligent nanocontainers, and 0.5-1 parts pH fluorescent indicator. The composite sol was uniformly coated onto the surface of the micro-arc oxidation ceramic substrate. Gradient heat treatment is performed: first, hold at 80℃ for 1 hour, then hold at 150℃ for 1 hour, and finally hold at 300℃ for 2 hours under nitrogen protection.

[0073] Self-healing microcapsules are prepared by in-situ polymerization. The specific steps include: mixing epoxy resin with water and emulsifier and shearing at high speed to form an emulsion, then adding urea and formaldehyde aqueous solution, reacting at 55-65℃ for 2-4 hours under acidic catalytic conditions, and obtaining self-healing microcapsules after filtration, washing and drying.

[0074] The steps for preparing the superhydrophobic and wear-resistant top layer include: mixing fluorosilicone resin and graphene nanosheets in ethyl acetate solvent at a mass ratio of 100:0.5 to 100:2, coating the mixture onto the surface of the graphene-reinforced ceramic intermediate layer by spraying, and curing it at 150°C for 1 hour.

[0075] The surface pretreatment steps include: sandblasting the workpiece with 100-200 mesh zirconia sand, followed by ultrasonic cleaning in an alkaline degreasing agent and ethanol, and finally drying.

[0076] Specifically, in actual processing: Surface pretreatment.

[0077] The connector housing (6061 aluminum alloy) and end cap are sandblasted with 100-200 mesh zirconium oxide sand, followed by ultrasonic cleaning in alkaline degreasing agent and ethanol (15 minutes each), and finally dried at 80℃.

[0078] Underlying material preparation.

[0079] (1) Micro-arc oxidation treatment of aluminum alloy shell and end cap: using silicate system electrolyte, constant current mode to control current density of 12A / dm², frequency of 1000Hz, treatment for 25 minutes to form a ceramic layer with a thickness of 35±5μm.

[0080] (2) Electroplating nickel on copper alloy conductive pins: Using Watt's nickel plating solution, the current density is controlled at 3A / dm² and the temperature at 55℃ to obtain a nickel layer with a thickness of 10±2μm.

[0081] 3. Preparation of the intermediate layer.

[0082] (1) Preparation of composite sol: By mass, take 100 parts of tetraethyl orthosilicate, 180 parts of ethanol, 60 parts of deionized water, and 8 parts of hydrochloric acid (0.1 mol / L), mix and hydrolyze, then add 15 parts of KH-550 functionalized graphene oxide dispersion, 10 parts of self-healing microcapsules, 3 parts of intelligent nanocontainers, and 0.8 parts of pH fluorescent indicator, and stir continuously until uniform.

[0083] (2) The composite sol is uniformly coated on the bottom surface using a spraying device, and the wet film thickness is controlled to be 150 μm.

[0084] (3) Gradient heat treatment: 80℃ / 1h→150℃ / 1h→300℃ / 2h (nitrogen protection).

[0085] 4. Top-level preparation.

[0086] Fluorosilicone resin and graphene nanosheets were mixed in ethyl acetate at a mass ratio of 100:1, and a wet film was formed by spraying. After curing at 150℃ for 1h, a superhydrophobic and wear-resistant top layer with a thickness of 8±1μm was obtained.

[0087] In summary, the ceramic-coated marine cable connector and its preparation method according to the embodiments of this application effectively solve the problem of galvanic corrosion of dissimilar metals through micro-arc oxidation / electroplated nickel differential bottom layer treatment, utilize graphene composite intermediate layer to achieve physical barrier and intelligent response synergistic protection, and combine with superhydrophobic top layer to form a complete protection system. Ultimately, while ensuring coating bonding strength, it significantly improves the corrosion resistance life and maintainability of the connector in marine environment.

[0088] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0089] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0090] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A ceramic-coated marine cable connector, comprising a connector housing, conductive pins, and end caps, characterized in that, A composite protective coating system is provided on the outer surface of the connector housing and the mating surface of the end cap, and a metal protective plating layer is provided on the contact surface of the conductive pin. The composite coating system comprises, from the inside out: Micro-arc oxidation ceramic substrate, which is directly formed on the surface of the connector housing, conductive pin, or end cap; A graphene-reinforced ceramic intermediate layer is provided, which covers the micro-arc oxidation ceramic substrate. A superhydrophobic and wear-resistant top layer is provided, which covers the graphene-reinforced ceramic intermediate layer.

2. The ceramic-coated marine cable connector according to claim 1, characterized in that, The connector housing is made of aluminum alloy, and the micro-arc oxidation ceramic bottom layer is a ceramic layer generated in situ on the surface of the connector housing by micro-arc oxidation process, with a thickness of 20-50 micrometers. The conductive pin is made of copper alloy, and the metal protective coating is a nickel layer formed by electroplating, with a thickness of 5-15 micrometers.

3. The ceramic-coated marine cable connector according to claim 1, characterized in that, The graphene-reinforced ceramic interlayer comprises a ceramic matrix and functional components uniformly dispersed in the ceramic matrix, the functional components including: Graphene, wherein the graphene is functionalized with a silane coupling agent; The self-healing microcapsule comprises a wall material and a core material. The wall material of the self-healing microcapsule is a mixture of urea and formaldehyde resin, and the core material of the self-healing microcapsule is a mixture of epoxy resin and latent curing agent. The intelligent nanocontainer is composed of mesoporous silica nanoparticles, and the pores of the mesoporous silica nanoparticles are loaded with sodium molybdate corrosion inhibitors. pH fluorescent indicator, wherein the pH fluorescent indicator is uniformly dispersed in the ceramic matrix.

4. The ceramic-coated marine cable connector according to claim 3, characterized in that, The self-healing microcapsule comprises a urea and formaldehyde resin wall material, and a core material encapsulated by the wall material, wherein the core material comprises epoxy resin and a latent curing agent. The pore openings of the mesoporous silica nanoparticles are capped by pH-responsive crown ether molecules. The pH fluorescence indicator is phenolphthalein.

5. The ceramic-coated marine cable connector according to claim 1, characterized in that, The superhydrophobic and wear-resistant top layer is a composite layer of fluorosilicone resin and graphene nanosheets, wherein the mass of the graphene nanosheets is 0.5% to 2% of the mass of the fluorosilicone resin, and the thickness of the superhydrophobic and wear-resistant top layer is 5-10 micrometers.

6. A composite anti-corrosion treatment method for preparing a ceramic-coated marine cable connector as described in any one of claims 1-5, characterized in that, Includes the following steps: Surface pretreatment is performed on the connector housing, conductive pins, and end caps; Micro-arc oxidation treatment is applied to the connector housing and end cap made of aluminum alloy to form a micro-arc oxidation ceramic underlayer on its surface; The conductive pins made of copper alloy are electroplated with nickel, and then the nickel layer is subjected to micro-arc oxidation treatment. A graphene-reinforced ceramic intermediate layer is prepared on the micro-arc oxidation ceramic substrate of the connector housing, conductive pins and end caps by means of sol-gel process and spraying process; A superhydrophobic and wear-resistant top layer is prepared on the graphene-reinforced ceramic intermediate layer by a spraying process.

7. The composite anti-corrosion treatment method according to claim 6, characterized in that, The specific steps for preparing the graphene-reinforced ceramic interlayer include: The composite sol, by weight, comprises: 100 parts tetraethyl orthosilicate, 150-200 parts ethanol, 50-80 parts deionized water, 5-10 parts hydrochloric acid, 10-20 parts functionalized graphene oxide dispersion, 5-15 parts self-healing microcapsules, 2-5 parts intelligent nanocontainers, and 0.5-1 parts pH fluorescent indicator. The composite sol is uniformly coated onto the surface of the micro-arc oxidation ceramic substrate. Gradient heat treatment is performed: first, hold at 80℃ for 1 hour, then hold at 150℃ for 1 hour, and finally hold at 300℃ for 2 hours under nitrogen protection.

8. The composite anti-corrosion treatment method according to claim 7, characterized in that, The self-healing microcapsules are prepared by in-situ polymerization. The specific steps are as follows: epoxy resin is mixed with water and emulsifier and subjected to high-speed shearing to form an emulsion. Then, urea and formaldehyde aqueous solution are added, and the mixture is reacted at 55-65℃ for 2-4 hours under acidic catalytic conditions. After filtration, washing and drying, the self-healing microcapsules are obtained.

9. The composite anti-corrosion treatment method according to claim 6, characterized in that, The steps for preparing the superhydrophobic and wear-resistant top layer include: mixing fluorosilicone resin and graphene nanosheets in ethyl acetate solvent at a mass ratio of 100:0.5 to 100:2, coating the mixture onto the surface of the graphene-reinforced ceramic intermediate layer by spraying, and curing it at 150°C for 1 hour.

10. The composite anti-corrosion treatment method according to claim 6, characterized in that, The surface pretreatment steps include: sandblasting the workpiece with 100-200 mesh zirconium oxide sand, followed by ultrasonic cleaning in an alkaline degreasing agent and ethanol, and finally drying.

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