33 results about "Plasma electrolytic oxidation" patented technology

The invention relates to the technical field of brass materials, in particular to a high-strength and high-toughness brass material and a preparation method thereof.The preparation method comprises the steps that a porous oxide film layer is prefabricated on the surface of brass through plasma electrolytic oxidation, and an oxide film layer doped with double-bond silver-loaded graphene oxide is constructed on the surface of the brass; the preparation method comprises the following steps: firstly, preparing modified MXene, then preparing a photocurable hole sealing coating for hole sealing treatment, introducing double-bond silver-loaded graphene oxide and the modified MXene as fillers into the photocurable hole sealing coating, firstly performing sulfhydrylation on the MXene by using 3-mercaptopropyltriethoxysilane, and then grafting a double-bond-containing bis-benzimidazole ring derivative through light click to obtain the modified MXene; vinyl-terminated polyurethane is used as a cross-linking agent, o-phenyl phenoxyethyl acrylate, butyl acrylate, glycidyl methacrylate and octadecyl acrylate are compounded to serve as an acrylic monomer, a diluent and a solvent are introduced, a complex cross-linked network is constructed, and the service life of the brass material is prolonged.

FIELD: protective coatings.SUBSTANCE: method for forming a protective oxide-ceramic coating on the surface of products made of valve metals and alloys by the plasma electrolytic oxidation method involves immersing the product as an electrode together with a counter electrode in a bath filled with an aqueous alkaline electrolyte, and supplying rectangular pulses of anodic and cathodic voltage to the electrodes using a pulsed power source. Anode and cathode voltage pulses are supplied with a current-free pause between them, the value of which is 4.8 times the duration of the anode pulse. The amplitude values of the cathode voltage pulses range from 85 to 149 V with a pulse repetition frequency from 1000 Hz to 4000 Hz, while the current pulse repetition frequency is additionally regulated.EFFECT: obtaining oxide-ceramic coatings with specified properties under reduced energy conditions, with lower values of cathode voltage.1 cl, 2 ex

The application relates to a preparation method and application of a titanium alloy surface antibacterial nanometer enzyme coating and relates to a titanium alloy surface modification method and application. The application aims to solve the problem of nanometer enzyme activity reduction caused by the shielding effect of a resin primer on active sites of nanometer enzymes in a traditional nanometer enzyme immobilization method. A porous ceramic coating is prepared on a titanium alloy surface through plasma electrolytic oxidation technology, active groups and nano structures are generated on the surface of the porous ceramic coating through alkali heat treatment, and cerium-based nanometer enzyme UiO-66 (Ce) with high HPO activity and high binding force is grown on the surface of the titanium alloy porous ceramic coating in situ; the PEO / UiO-66 (Ce) integral coating prepared in the in-situ growth mode has the advantages that the UiO-66 (Ce) nanometer enzyme is directly grown on the surface in situ, active sites can be fully exposed to a water environment, Br ‑ and H2O2 can easily enter the active sites to trigger a catalytic reaction to generate HOBr.

An aircraft component including an aluminum substrate and a plasma electrolytic oxidation (PEO) coating disposed on the aluminum substrate. The PEO coating includes a plurality of cavities. A set of nano capsules disposed in the plurality of cavities, with at least a portion of the nano capsules in the set of nano capsules containing a corrosion inhibitor.

The invention discloses an aluminum frame cladding plate, a curtain wall and a building. The aluminum frame cladding plate comprises an aluminum alloy frame, a plastic-wood cladding plate and a layered buffer structure. The surface of a base plate of the plastic-wood laminated plate is subjected to plasma electrolytic oxidation to generate a ceramic layer, micron-sized grooves are formed through laser microtexturing, and a base material is compounded on the surface of the base plate through a polyurethane or epoxy resin hybrid adhesive. A cavity is formed between the cladding plate and the aluminum alloy frame, and is filled with a layered buffer structure consisting of a silicon rubber sheet and a hydrophobic aerogel film. The curtain wall comprises a stand column, a cross beam, a connecting piece and the aluminum frame cladding plate, the stand column is provided with a vertical sliding groove, the connecting piece comprises a sliding block, a belleville spring and a fixing bolt, the sliding block is embedded into the vertical sliding groove and fixed through the fixing bolt, the belleville spring extends into the installation groove of the adjacent aluminum frame cladding plate, and elastic connection of the upper aluminum frame cladding plate and the lower aluminum frame cladding plate is achieved. The curtain wall is suitable for building facades and has impact resistance, heat insulation and earthquake resistance.

A process of applying a coating to a substrate is provided. A layer of a metallic or ceramic material is applied on the substrate by a thermal spray process. The layer is then subject to plasma electrolytic oxidation (PEO) processing to densify the layer such that a porosity of the layer after PEO processing is lower than a porosity of the layer before PEO processing, or modify the layer by incorporating additional ceramic phases from the electrolyte bath into the densified layer, or improve the adhesion of the thermal spray layer. A base layer may be applied to the substrate with PEO processing before the above referenced layer is applied and / or a ceramic topcoat may be applied to the above referenced layer by a thermal spray process.

This invention relates to the field of brass material technology, specifically a high-strength, high-toughness brass material and its preparation method. A porous oxide film is pre-formed on the brass surface through plasma electrolytic oxidation. A double-bonded silver-loaded graphene oxide-doped oxide film is then constructed on the brass surface. A photocurable sealing coating is then prepared for sealing. In the photocurable sealing coating, double-bonded silver-loaded graphene oxide and modified MXene are introduced as fillers. MXene is first thiolated with 3-mercaptopropyltriethoxysilane, and then grafted with a double-bonded dibenzimidazole ring derivative via photo-clicking to obtain modified MXene. A vinyl-terminated polyurethane is used as a crosslinking agent, and a complex crosslinking network is constructed using a blend of o-phenylphenoxyethyl acrylate, butyl acrylate, glycidyl methacrylate, and octadecyl acrylate as acrylic monomers. A diluent and solvent are introduced to extend the service life of the brass material.

The invention relates to the technical field of circuit control, and discloses a multi-machine parallel control system of a plasma electrolytic oxidation power supply, which comprises a high-voltage direct-current power supply module, a low-voltage direct-current power supply module, a first full-bridge inverter module, a second full-bridge inverter module and a complete machine control panel, the input end of the high-voltage direct-current power supply module is connected with external alternating current, the output end of the high-voltage direct-current power supply module is connected with the input end of the first full-bridge inversion module, and the output end of the first full-bridge inversion module is connected with a load; the input end of the low-voltage direct-current power supply module is connected with external alternating current, the output end of the low-voltage direct-current power supply module is connected with the input end of the second full-bridge inversion module, and the output end of the first full-bridge inversion module is connected with a load; and the first full-bridge inverter unit and the second full-bridge inverter unit are used for superposing the direct current output by each single-machine power supply to obtain direct current with multiple pulse waveforms and outputting the direct current to a load.

A method for providing a wear-resistant component includes depositing an aluminum coating on a steel component to provide an aluminum-coated steel component, and subjecting the aluminum-coated steel component to a plasma electrolytic oxidation (PEO) process. The PEO process converts a surface portion of the aluminum coating to alumina. A wear-resistant component includes a steel component and a wear-resistant coating on the steel component. The wear-resistant coating includes an alumina surface portion and an underlying portion of either aluminum or aluminum and nickel combination or nickel aluminide that contacts the steel component.

The invention discloses an antioxidant copper-based alloy foil tape. The surface of the foil tape is provided with a composite protective film layer; the composite protective film layer comprises a transition bottom layer formed by plasma electrolytic oxidation and a nanocrystalline tin-indium alloy hole sealing surface layer formed by electro-deposition from inside to outside; the total thickness of the composite protective film layer is 15-30 [mu] m. According to the invention, a composite structure of a plasma electrolytic oxidation bottom layer and a nano tin-indium alloy surface layer is created for the first time, so that the foil tape has excellent oxidation resistance and corrosion resistance through the synergistic effect of multiple mechanisms such as physical isolation, chemical passivation and electrochemical protection. Meanwhile, the conductive function is mainly borne by the high-conductivity nano metal layer on the surface layer, the bottom layer is designed to be extremely thin, and the conductivity is optimized through element doping, so that the influence of the composite film layer on the intrinsic conductivity of the substrate is reduced to an extremely low level; and the core contradiction that the protection performance and the conductivity are mutually restricted in the traditional surface treatment technology is successfully solved.

The application discloses a preparation method of a wear-resistant and corrosion-resistant modified composite coating on a hardware product surface, and belongs to the technical field of metal surface modification. The method generates a ceramic base layer containing a nano silicon carbide reinforcing phase on the hardware product surface in situ through double-frequency double-pulse plasma electrolytic oxidation, then uniformly penetrates fluorine-containing organic silicon resin into the micropore inside the ceramic layer by using a supercritical carbon dioxide fluid impregnation technology, and finally forms a gradient structure composite coating through low-temperature plasma solidification. The composite coating prepared by the application has high bonding strength with the substrate, the surface hardness can reach above 1200HV, the friction coefficient is below 0.25, the self-corrosion current is below 5*10 ‑11 A / cm² in a 3.5% sodium chloride solution, simultaneously has excellent water scale adhesion resistance and aging resistance, and can be widely applied to the surface protection of hardware products in the fields of kitchen and bathroom, ocean engineering, mechanical manufacturing and the like.

The application discloses a device and a method for preparing a high-temperature-resistant ceramic coating on a titanium alloy surface through laser-assisted plasma sintering of nanoparticles; the device introduces one or more kinds of nanoparticles such as Al2O3, ZrO2 and CeO2 into an electrolyte column through a lateral nozzle, and the nanoparticles have good dispersibility, so that the loss of laser beams in the electrolyte column caused by a traditional nanoparticle introduction mode is avoided; in the device, laser energy directly acts on the nanoparticles, the nanoparticles are pre-melted or softened after absorbing the energy, and the nanoparticles are rapidly sintered into the coating under the action of a discharge plasma, so that the sintering efficiency of the nanoparticles in a selective area plasma electrolytic oxidation process is improved; the device accelerates the speed of the nanoparticles in participating in the formation of oxides, can improve the coating thickness and the surface micropore sealing effect, and can prepare a multifunctional composite ceramic coating by using nanoparticle solutions with different components and proportions, so that the heat resistance of the titanium alloy is improved.

The invention relates to a biodegradable implant comprising a surface-coated magnesium alloy product, wherein the coating layer contains oxides and / or phosphates of rare earth elements, Mg, Ca, Zn, Zr, Mn, or Ag, and wherein the coating is preferably produced by plasma electrolytic oxidation (PEO). The invention further comprises a method for producing the coated magnesium alloy product of the implant.

The invention provides a magnesium alloy multi-layer composite structure anti-corrosion coating and a preparation method and application thereof, and belongs to the technical field of metal surface treatment. According to the anti-corrosion coating, magnesium-zinc alloy serves as a base material, the multi-layer structural design of a plasma electrolytic oxidation bottom layer, a hydroxyapatite doped LDH middle layer, a polydopamine / graphene oxide composite bonding layer and a ZIF-8 surface layer is adopted, and the anti-corrosion coating is prepared through plasma electrolytic oxidation treatment, step-by-step hydrothermal treatment, in-situ growth and coordination reaction. The coating and the magnesium alloy base body are combined in a super-strong mode, meanwhile, long-acting active corrosion prevention, excellent biocompatibility and strong combination performance are integrated, the key problems that a medical magnesium alloy instrument is corroded too fast, and the coating is prone to stripping are fundamentally solved, and application of the magnesium-zinc alloy in medical instruments is remarkably expanded.

The application discloses a preparation method of bright corrosion-resistant aluminum profile and relates to the technical field of aluminum profile processing, which comprises the following processes: mixing and smelting raw materials, pouring, homogenizing treatment, forming ingot; extruding, heat treatment, forming aluminum profile; surface treatment, obtaining the bright corrosion-resistant aluminum profile; the surface treatment comprises electrolytic oxidation, electrophoretic painting and sealing hole. The rare earth elements play the roles of purifying the matrix, refining modification and micro-alloying in the aluminum alloy, refine the aluminum alloy structure, can show better compactness and integrity after oxidation, improve the protection performance of the aluminum profile, and improve the corrosion resistance and brightness of the aluminum profile. The anode plasma electrolytic oxidation is used for pretreating the aluminum profile and oxidizing the surface of the aluminum profile; then the cathode plasma electrolytic deposition is used, direct contact of the cathode aluminum profile with the electrolyte is avoided, the pores of the barrier layer are sealed, a more compact oxide layer is obtained, and the brightness and corrosion resistance are improved.

The invention relates to the technical field of plasma catalysis, and discloses a plasma electrolytic oxidation catalytic transesterification reaction device which comprises a base, a reaction barrel is fixedly installed at the top of the base, flow guide pipes are symmetrically arranged on the outer surface of the reaction barrel, valves are fixedly installed on the outer sides of the middles of the flow guide pipes, and inductive sensors are arranged on the inner sides of the valves. An upper-layer plate and a middle-layer plate are arranged on the inner side of the reaction barrel, a main mandrel is arranged above the reaction barrel in a penetrating manner, and a driving motor is fixedly mounted at the top end of the main mandrel. Dynamic discharge and bubble catalysis are combined, a graphite electrode is newly added, the electrode area and interval parameters are optimized, catalytic active sites are greatly increased, and high-density plasma active species are excited by utilizing the internal environment of bubbles, so that accurate and uniform injection of plasma energy is realized; the catalytic selectivity of transesterification, amino acid hydrolysis and organic acid aging is improved, side reactions are reduced, and flavor components of condiments such as soy sauce and vinegar are prevented from being damaged.

A method of manufacturing a heat cutting element for a surgical instrument includes manufacturing a substrate, coating at least a portion of the substrate via plasma electrolytic oxidation (PEO), and disposing a heating element on at least a portion of the PEO-coated substrate. The method can further include attaching the heat cutting element to a jaw member of a surgical instrument. A heat cutting element for a jaw member of a surgical instrument includes a substrate, a PEO coating disposed on the substrate, and a heating element disposed on the PEO coating and including first and second end portions adapted to be connected to different electrical potentials to heat the heating element.

The invention relates to the technical field of surface functional coatings, in particular to plasma electrolytic oxidation liquid and a preparation method thereof, and a titanium alloy fastener surface oxide ceramic coating and a preparation method thereof. The invention provides plasma electrolytic oxidation liquid. The plasma electrolytic oxidation liquid comprises a film-forming agent, a coloring agent, a bath solution stabilizer, a coloring auxiliary agent and water, the film-forming agent comprises one or more of sodium pyrophosphate, sodium polyphosphate and sodium perphosphate; the coloring agent comprises one or more of dicobalt oxalate tetraacetate, copper tetramine sulfate, titanium potassium oxalate and potassium ferrate; the bath solution stabilizer comprises one or more of disodium ethylenediaminetetraacetate, sodium tetraborate, sodium potassium tartrate tetrahydrate and sodium citrate; the coloring auxiliary agent comprises one or more of sodium silicate, sodium tungstate and sodium molybdate. The plasma electrolytic oxidation liquid can ensure that a surface coating with good blackness is obtained on the surface of a titanium alloy fastener within a short time.

The invention discloses a quantum dot composite functional film and a preparation method thereof, and belongs to the technical field of metal surface treatment. According to the method, through an innovative process of introducing quantum dot dispersion liquid into plasma electrolytic oxidation liquid in situ, a functional film layer which has high corrosion resistance and high binding force and is compounded with quantum dot specificity is formed on the surface of a metal matrix. The method comprises the core steps of metal matrix pretreatment, quantum dot dispersion liquid preparation, plasma electrolytic oxidation liquid preparation, plasma electrolytic oxidation treatment and aftertreatment. The technical bottlenecks of quantum dot agglomeration, weak binding force and poor functional stability in a traditional quantum dot-plasma electrolytic oxidation film layer are solved, and the prepared composite functional film is uniform in quantum dot dispersion, has a reversible optical response characteristic, can be widely applied to the fields of metal material protection, corrosion monitoring, optical devices and the like, and has wide application prospects. The method is simple in process, controllable in cost and suitable for industrial mass production.

The invention discloses a regioselective preparation method of a ceramic coating on the surface of stainless steel, which comprises the following steps: firstly, placing a stainless steel substrate in an acidic electrolyte for electrochemical passivation treatment, and forming a layer of compact oxidation passivation film on the surface of the stainless steel substrate; and then, the stainless steel substrate with the passive film is directly placed in an alkaline electrolyte, and plasma electrolytic oxidation treatment is carried out in a stepped current-constant voltage conversion mode by utilizing the original conductive connection points (not immersed in the electrolyte). The prefabricated passivation film is used as the barrier layer and the induction layer, the breakdown characteristic of the stainless steel surface is changed, the overburning phenomenon caused by excessive oxidation of the chromium element is effectively restrained, and the ceramic layer can stably grow on the surface of the passivation film in situ. The prepared composite coating is compact, uniform and high in binding force, and the wear resistance of the stainless steel is remarkably improved.

An aircraft component is disclosed. The aircraft component includes a substrate, the substrate comprising at least one a first metal or first metal alloy and a ceramic coating formed on a surface of at least a portion of the substrate. The ceramic coating is formed by applying a cold sprayed material to the surface, the cold sprayed material being at least one of a second metal or second metal alloy that meets a predetermined galvanic compatibility with the first metal or the first metal alloy and subjecting the aircraft component to a plasma electrolytic oxidation (PEO) process, wherein during the PEO process the cold sprayed material on the surface is converted to ceramic.

This invention relates to the field of composite coating technology, and more particularly to a graphene-enhanced plasma electrolytic oxidation composite coating, its preparation method, and its application. The preparation method of the graphene-enhanced plasma electrolytic oxidation composite coating provided by this invention includes the following steps: mixing a graphene dispersion and a basic electrolyte to obtain a graphene-enhanced PEO composite electrolyte; using AlSi... 10 Using a Mg alloy substrate as the anode and a stainless steel electrolytic cell as the cathode, plasma electrolytic oxidation treatment is performed in the graphene-reinforced PEO composite electrolyte to obtain a graphene-reinforced plasma electrolytic oxidation composite coating. The graphene-reinforced plasma electrolytic oxidation composite coating prepared by this method exhibits excellent comprehensive properties, including mechanical properties, abrasion resistance, and corrosion resistance.

The invention relates to the technical field of water treatment, in particular to an immobilized carrier material used for water treatment and used for immobilizing microorganisms and a preparation method of the immobilized carrier material, and the main technical scheme is as follows: the immobilized carrier material comprises a porous Co-Cr-Mo alloy skeleton and a biological activating coating; wherein the porosity of the porous Co-Cr-Mo alloy framework is 60%-80%, the average pore size is 100-500 microns, and the surface of the porous Co-Cr-Mo alloy framework is of a micron-sized dendritic crystal structure; the biological activation coating is a Ca / P-containing oxide layer generated on the surface of the alloy through plasma electrolytic oxidation, the thickness of the coating is 18-50 microns, and a polydopamine-chitosan compound is grafted on the surface of the coating. Through the collaborative design of the porous Co-Cr-Mo alloy skeleton and the functional bioactive coating, and in combination with plasma electrolytic oxidation and polydopamine-chitosan composite grafting technologies, efficient immobilization and activity maintenance of microorganisms are realized, and meanwhile, the carrier is endowed with conductivity and catalytic degradation capability, so that the water treatment performance is remarkably improved.

The application relates to the technical field of plasma catalysis, and discloses a plasma electrolytic oxidation catalytic transesterification reaction device, which comprises a base, a reaction barrel is fixedly installed at the top of the base, flow guide pipes are symmetrically arranged on the outer surface of the reaction barrel, a valve is fixedly installed on the outer side of the middle part of the flow guide pipe, an induction sensor is arranged on the inner side of the valve, upper and middle layer plates are arranged on the inner side of the reaction barrel, a main shaft is arranged in the upper part of the reaction barrel in a penetrating mode, and a driving motor is fixedly installed at the top end of the main shaft. The device combines dynamic discharge and bubble catalysis, adds graphite electrodes, optimizes the electrode area and interval parameters, greatly increases the catalytic active sites, excites high-density plasma active species by using the internal environment of the bubbles, realizes accurate and uniform injection of plasma energy, improves the catalytic selectivity of transesterification, amino acid hydrolysis and organic acid aging, reduces side reactions, and avoids destroying the flavor components of condiments such as soy sauce and vinegar.

This invention discloses a method for synergistic control of shape and properties and surface treatment of metal additive manufacturing parts, relating to the field of metal part processing technology. The processing steps are as follows: S1, constructing a part simulation system based on big data, simulating parameters for the current part material and shape, and obtaining optimal shape and property synergistic control parameters; S2, using additive manufacturing equipment, melting and solidifying metal powder layer by layer based on the obtained shape and property synergistic control parameters to obtain a metal additive manufacturing part blank; S3, removing the support structure on the part blank by mechanical cutting, and grinding and smoothing the cut edges; placing the part after support removal in a heat treatment furnace. This invention utilizes the synergistic effect of a dense ceramic oxide film formed by plasma electrolytic oxidation and a laser impact shot peening modification layer to significantly improve the surface hardness, corrosion resistance, and wear resistance of the part; multi-process synergistic enhancement of part performance, closed-loop controllable process, wide adaptability, and improvement of product qualification rate and production stability.

This application discloses a method and system for performance prediction and process optimization of a PEO composite coating of a seven-series aluminum alloy, relating to the field of electronic chemistry. The method includes obtaining a combination of process parameters to be tested for the composite coating, wherein the composite coating is a plasma electrolytic oxidation composite coating of a seven-series aluminum alloy synergistically reinforced with graphene and carbon nanotubes; inputting the combination of process parameters into a trained artificial neural network, an extreme gradient boosting model, and an integrated model of support vector regression and random forest regression to obtain corresponding performance parameter combinations; predicting the coating thickness and microhardness of the composite coating using the artificial neural network, predicting the friction coefficient and wear rate of the composite coating using the extreme gradient boosting model, and predicting the corrosion current density of the composite coating using the integrated model of support vector regression and random forest regression; the coating thickness, microhardness, friction coefficient, wear rate, and corrosion current density constitute the performance parameter combination of the composite coating, significantly improving prediction accuracy and efficiency.

The application discloses a preparation method of a wear-resistant and corrosion-resistant modified composite coating on a hardware product surface, and belongs to the technical field of metal surface modification. The method generates a ceramic base layer containing a nano silicon carbide reinforcing phase on the hardware product surface in situ through double-frequency double-pulse plasma electrolytic oxidation, then uniformly penetrates fluorine-containing organic silicon resin into the micropore inside the ceramic layer by using a supercritical carbon dioxide fluid impregnation technology, and finally forms a gradient structure composite coating through low-temperature plasma solidification. The composite coating prepared by the application has high bonding strength with the substrate, the surface hardness can reach above 1200HV, the friction coefficient is below 0.25, the self-corrosion current is below 5*10 ‑11 A / cm² in a 3.5% sodium chloride solution, simultaneously has excellent water scale adhesion resistance and aging resistance, and can be widely applied to the surface protection of hardware products in the fields of kitchen and bathroom, ocean engineering, mechanical manufacturing and the like.

The invention relates to the technical field of electrolytic treatment, in particular to an intelligent management system based on a plasma electrolytic oxidation electrolyte. Comprising an electrolytic bath, an anode, a cathode, a liquid inlet and a liquid outlet. The sensor module is provided with a plurality of sensors and can detect the composition and state of the electrolyte; the control unit comprises a microprocessor and a wireless communication module and can receive and analyze data of the sensor and judge the electrolyte state; the feedback adjusting system adjusts the electrolyte proportion and operation parameters in real time according to the analysis result, the adjusting valve controls the flow of electrolyte with different components, the chemical adding device adds a supplement or an adjusting agent according to instructions, the heating device and the cooling device adjust the temperature at the low temperature and the high temperature respectively, and the pH adjusting device comprises a storage tank, a pump and spraying devices installed at multiple positions of an electrolytic bath. And the control unit adjusts the pH value of the electrolyte in real time according to the pH data. According to the technical scheme, the electrolyte state can be monitored and adjusted in real time, and intelligent management is achieved.

A method of producing a bioactive surface on a medical device configured for cementless implantation is disclosed. The method can include treating a titanium metal or titanium alloy medical device, optionally having a titanium metal or titanium alloy porous coating, with a series of steps to obtain the bioactive surface having a nanofibrous network of titanate overlaid with hydroxyapatite particles or film. The steps can include treating the medical device with an acidic solution to obtain an activated surface; oxidizing the activated surface using plasma electrolytic oxidation to obtain an oxide layer having bioactive elements, compounds, or phases; treating the oxide layer with an alkaline solution to obtain the bioactive surface; and treating the bioactive surface with an iodine containing compound to obtain an antibacterial and bioactive surface.

The invention discloses a preparation method for constructing a multi-size light absorption coating by doping low-refractive-index particles, and relates to a preparation method of a light absorption coating. The purpose of the present invention is to increase the absorptivity and emissivity of black coatings used in existing thermal protection fields. According to the preparation method, SiO2 nano-particles are used as doping particles, and the coating is obtained through a plasma electrolytic oxidation method; siO2 NPs is doped into the coating, so that the surface of the coating has a low effective refractive index, and reflection can be effectively reduced; the coating has a multi-size micro-nano surface structure, and the nano structure can enhance forward scattering and promote the coating to absorb and scatter light in a solar spectral range; the micron protruding structures promote light scattering of the coating on the infrared band, the optical path is increased, and the infrared emission performance of the coating is improved. The coating has good thermal control performance due to excellent absorption performance and emission performance, and has huge potential for long-term application under outdoor and extreme environment conditions.