533 results about "Micro arc oxidation" patented technology

The invention relates to the technical field of high-corrosion-resistance stainless steel pipe processing, and discloses a high-corrosion-resistance high-molybdenum stainless steel pipe processing technology based on gradient carbide design, which comprises the following steps: applying an axial gradient magnetic field in a stainless steel pipe rolling process, and combining with dynamic strain rate matching rolling to promote molybdenum atom grain boundary migration and inhibit carbide coarsening, so as to obtain a high-molybdenum-resistance stainless steel pipe. Nano carbide smaller than or equal to 50 nm is formed on the surface layer, and submicron carbide of 200-500 nm is formed on the core part; after rolling, micro-arc oxidation and phosphonic acid group silane dipping are immediately carried out to form a self-repairing passivation film; and finally, an alternating magnetic field and pulse current are adopted for cooperative annealing, and a grain boundary molybdenum-poor region and residual stress are eliminated. Through magnetic field-chemical-thermal multi-field coupling, the material has erosion corrosion resistance of a gradient carbide structure, dynamic passive film self-repairing and low-temperature high toughness, and is suitable for long-acting protection of deep sea oil and gas pipelines.

The invention discloses a production process of a high-strength anti-corrosion power transmission pole cross arm. The production process comprises the following steps that 1, an anti-SCC aluminum alloy is selected; a trace amount of Sc is added to refine grains, so that the corrosion resistance is improved; cold machining is avoided, and a warm forming process is adopted; 2, aluminum alloy ingot smelting and hot extrusion forming are carried out; 3, T6 solid solution treatment is carried out to improve the strength; 4, the five-axis CNC machining center conducts structural topology optimization cutting; the surface roughness Ra of a key bearing part is less than or equal to 0.8 mu m; an ultrasonic-assisted drilling technology is adopted; step 5, micro-arc oxidation; and step 6, ultrasonic flaw detection and infrared thermal imaging. The 5083-H116 aluminum alloy is combined with Sc microalloying, precision machining and micro-arc oxidation technologies, so that the stress corrosion resistance is improved by 3 times, the fatigue life is prolonged by 2-3 times while the tensile strength of the power transmission pole cross arm is kept to be larger than or equal to 350 MPa, 5000-hour salt mist protection and 30-year maintenance-free are achieved, and the service life of the power transmission pole cross arm is prolonged. The problems of corrosion cracking, short fatigue life and insufficient durability of a traditional product in a harsh environment are comprehensively solved.

The invention provides a biological magnesium alloy micro-arc oxidation coating supercritical hole sealing method based on a thermodynamic sedimentary phase diagram, which comprises the following steps: establishing deposition-dissolution balance of metal ion phosphide and hydroxide of a phosphate conversion film in a supercritical carbon dioxide environment at different pH values to obtain the thermodynamic sedimentary phase diagram; selecting a NaH2PO4 solution according to a thermodynamic sedimentary phase diagram, and adding NaHCO3 to obtain a hole sealing solution; the hole sealing solution is injected into a reaction kettle to be heated, and then a refrigerator is started to convert generated carbon dioxide gas into supercritical carbon dioxide; and the biological magnesium alloy subjected to micro-arc oxidation is placed in the hole sealing solution in the reaction kettle to be pressurized, and holes of the micro-arc oxidation coating on the surface of the biological magnesium alloy are sealed. The invention provides a supercritical hole sealing method for a biological magnesium alloy micro-arc oxidation coating based on a thermodynamic sedimentary phase diagram. And the hole sealing effect is good.

The invention discloses an anode material for adipic acid monoester electrolysis and a preparation method of the anode material, the electrode solves the key problems that a platinum layer is easy to fall off, the catalytic activity is low, the organic matter poisoning resistance is poor and the like of a traditional titanium platinum-plated electrode through multi-scale interface strengthening and nano structure regulation and control; the preparation method comprises the following core steps: constructing a porous ZrO2-TiO2 composite oxide layer on the surface of a titanium substrate by adopting a micro-arc oxidation-hydrothermal composite process, and generating platinum nanoparticles in situ to pre-fill pores, so that the anchoring effect of a platinum layer is remarkably enhanced; depositing a platinum / carbon nano tube (Pt / CNT) composite catalyst layer on the surface of the oxide layer through a pulse-ultrasonic synergistic electroplating technology, wherein the carbon nano tube is used as a conductive framework to inhibit platinum agglomeration; through vacuum annealing and electrochemical activation treatment, the interface bonding force and active site exposure are further optimized; the electrode shows excellent performance in an adipic acid monoester electrolysis system, and efficient electrocatalytic conversion from adipic acid monomethyl ester to dimethyl sebacate is achieved.

The invention discloses a coating with in-situ plugging and active protection functions as well as a preparation method and application thereof, and belongs to the technical field of metal material surface treatment. An innovative electrolyte design scheme is provided, the commercial 5083 aluminum alloy is subjected to micro-arc oxidation in a phosphate system containing specific cerium salt and a complexing agent, film layer growth and in-situ chemical blocking of micropores are completed in one step, the process is simple, and the obtained coating has excellent blocking firmness and corrosion resistance, has an active protection function and is suitable for large-scale industrial production. And a new solution is provided for improving the durability of the 5083 aluminum alloy in a harsh marine environment.

The invention relates to the technical field of lamps, in particular to a plating forming process of a lamp. The problems that the interface bonding force of the coating and the matrix is insufficient and the corrosion resistance of the coating is poor are solved. According to the method, micro-arc oxidation is carried out in the pretreatment stage, a compact Al-Si-O ceramic layer is generated on the surface of a high-aluminum matrix in situ, and in combination with deep diffusion of plasma siliconizing, a transition area with gradient Si distribution is constructed; the pitting corrosion resistance of the coating is optimized through the component gradient design of the inner-layer coating, the middle-layer coating and the outer-layer coating; the surface of the coating lamp is subjected to checkerboard scanning by using short pulse laser, so that the porosity and microdefects of the surface of the coating are improved, and the corrosion resistance of the coating is enhanced; a uniform oxynitride passivation film is generated on the surface of the coating in situ through low-temperature plasma post-oxidation-nitridation treatment, the defect that a film layer is easy to strip in a traditional passivation process is avoided, and the corrosion resistance of the material in long-term service can be stably maintained.

The invention relates to the technical field of coating materials, and discloses a pure titanium micro-arc oxidation coating for a vacuum cup and a preparation method thereof.The preparation method comprises the following steps that surface pretreatment is conducted, specifically, a pure titanium vacuum cup inner container workpiece is sequentially subjected to degreasing, acid pickling and ultrasonic cleaning; preparing an electrolyte, namely adding 15-25 parts by weight of a silicon-containing compound, 5-12 parts by weight of metal salt, 3-8 parts by weight of an antibacterial agent and 1-5 parts by weight of a stabilizer into deionized water, and controlling the pH value to be 8.5-10.5; and performing micro-arc oxidation treatment. According to the invention, a silane compound in the micro-arc oxidation electrolyte contains a high-activity silanol group which is subjected to condensation reaction with titanium hydroxyl on the surface of a pure titanium substrate under the action of an electric field to form stable covalent bonding, so that the bonding strength of the coating and the substrate is enhanced; metal ions generated by metal salt electrolysis are co-deposited with titanium ions through plasma discharge, a composite oxide structure is constructed, and micro defects on the surface of a titanium substrate are sealed.

The invention relates to the technical field of aluminum alloy heat treatment, and discloses a high-power tooth radiator aluminum alloy strengthening and toughening heat treatment method. Gradient temperature control solution treatment including at least two different temperature stages; step 2; carrying out electromagnetic auxiliary shape correction treatment, and applying an alternating magnetic field in the cooling process; step 3; the two-stage aging treatment comprises high-temperature first-stage aging and low-temperature second-stage aging; step 4; carrying out pulse type aging strengthening by adopting a periodic temperature fluctuation mode; step 5; and performing micro-arc oxidation surface treatment to generate an aluminum oxide layer in the electrolyte. Gradient temperature control solution treatment is adopted, a beta phase is fully dissolved, abnormal growth of crystal grains is inhibited, meanwhile, uniform nucleation of a GP region and dispersed distribution of a theta'phase are promoted through two-stage aging treatment, the strength and toughness of the alloy are improved, in addition, electromagnetic auxiliary shape correction and a composite residual stress elimination technology are combined, thermal stress deformation is effectively inhibited, residual stress is eliminated, and the performance of the alloy is improved. The size stability and the fatigue life are improved.

The preparation method of the aluminum oxide hydrogen-resistant coating on the zirconium hydride surface disclosed by the embodiment of the invention comprises the following steps: S1, plating aluminum on the surface of a zirconium hydride matrix in a magnetron sputtering manner, and forming an aluminum film on the surface of the zirconium hydride matrix; and S2, the aluminum film formed on the surface of the zirconium hydride matrix is subjected to micro-arc oxidation to obtain aluminum oxide, and the aluminum oxide hydrogen-resistant coating is obtained. Wherein an aluminum oxide film layer formed on the surface of zirconium hydride is tightly combined with a zirconium hydride matrix, and the thickness of the film layer is 5-80 microns; the aluminum oxide film layer is composed of an inner compact layer with a non-porous structure and an outer loose layer with a closed pore structure, the thickness of the compact layer is 2-15 microns, and the compact layer has a good hydrogen permeation resistance effect; the aluminum oxide film layer on the surface of zirconium hydride can serve as an aluminum oxide hydrogen-resistant coating, the hydrogen-resistant capacity of the zirconium hydride moderator is improved, and the service life of the zirconium hydride moderator is prolonged.

The invention belongs to the technical field of magnesium-zinc magnesium alloy surface treatment, and particularly relates to a method for in-situ growth of different blue ceramic film layers on the surface of a magnesium-zinc magnesium alloy. Comprising the following steps that the surface of a magnesium-zinc magnesium alloy sample is polished and cleaned, and then the surface of the sample is sequentially subjected to primary alkali washing, primary water washing, primary acid pickling, secondary water washing, secondary acid pickling, tertiary water washing and secondary alkali washing, so that the pretreated magnesium alloy is obtained; the pretreated magnesium alloy is placed in electrolyte for micro-arc oxidation treatment, and a blue ceramic film layer is generated on the surface of the magnesium alloy in situ; the electrolyte is formed by adding potassium fluotitanate and cobaltous sulfate into a silicate and phosphate composite electrolyte system; or the electrolyte is obtained by adding potassium fluotitanate into a phosphate electrolyte system. Different blue ceramic film layers are prepared, the ornamental value of the magnesium-zinc magnesium alloy component can be improved, and the visual effect is improved.

The invention discloses a titanium-based implant with antibacterial and osteogenesis-promoting properties as well as a preparation method and application thereof, and belongs to the technical field of crossing of biomedical materials and biomedicine. The selective laser melting porous titanium alloy is used as a matrix, micro-arc oxidation and hydro-thermal treatment are utilized, and the multifunctional composite coating with the antibacterial function and the osteogenesis promoting function is constructed on the surface of the selective laser melting porous titanium alloy; the microstructure and the biological performance of the coating are regulated and controlled by doping functional elements, so that the antibacterial performance and the osteogenesis promoting performance of the coating are optimized.

The invention discloses a high-temperature-resistant and corrosion-resistant aluminum alloy material and a preparation process thereof, and relates to the technical field of aluminum alloy materials. The high-temperature-resistant and corrosion-resistant aluminum alloy material is prepared by carrying out micro-arc oxidation treatment on aluminum alloy, carrying out plasma spraying on a corrosion-resistant spray coating and carrying out heat treatment. The aluminum alloy comprises the following raw material components in percentage by weight: 0.05%-0.15% of silicon, 0.1%-0.2% of iron, 1.2%-1.5% of copper, 0.7%-0.9% of manganese, 2.5%-3.8% of magnesium, 10.2%-12.4% of zinc, 0.02%-0.04% of titanium, 0.08%-0.15% of zirconium, 0.2%-0.4% of scandium, 0.5%-0.8% of silicon nitride whiskers, 0.5%-1% of an aluminum-coated graphene material and the balance of aluminum.

The invention belongs to the technical field of metal material surface modification, and particularly relates to a magnesium alloy surface conductive corrosion-resistant coating and a preparation method, the conductive corrosion-resistant coating comprises a three-layer structure, the total coating thickness is 33-50 microns, the bottom coating is a low-porosity MAO coating prepared through a micro-arc oxidation method, and the thickness is 20-35 microns; the middle coating is a conductive nano-particle layer prepared by adopting a negative pressure mode; and the top coating is a zinc aluminum oxide conductive layer prepared by adopting a vapor-phase hydrothermal deposition method, and the thickness of the top coating is 13-15 microns. In addition, the invention provides the modified magnesium alloy with the conductive corrosion-resistant coating prepared on the surface, the self-corrosion current density of the modified magnesium alloy is 0.18-1.8 * 10 <-7 > A / cm < 2 >, and the volume resistivity of the modified magnesium alloy is 1.30-5.21 * 10 < 4 > omega.m.

The invention discloses a high-temperature-corrosion-resistant stainless steel gas distribution disc and a preparation method thereof, and relates to the technical field of stainless steel machining, stainless steel is subjected to micro-arc oxidation treatment, the high temperature resistance and wear resistance of the surface of the stainless steel are improved, but the corrosion resistance of the stainless steel subjected to micropore treatment needs to be improved. Stainless steel subjected to micro-arc oxidation treatment is subjected to titanium dioxide layer plating treatment, micro-arc oxidation holes provide additional anchoring points, titanium dioxide layer plating treatment is carried out on the basis, the corrosion resistance of the stainless steel is improved, micro-arc oxidation treatment is firstly carried out on the surface of the stainless steel, then titanium dioxide is plated on the surface of the stainless steel, and the corrosion resistance of the stainless steel is improved. And the binding force between the titanium dioxide layer and the stainless steel substrate can be obviously improved. The graphene oxide-titanium dioxide composite sol is added into the electroplating solution, invasion of corrosive media is effectively blocked, the diffusion path of the corrosive media is prolonged through the graphene sheet layer, and the corrosion resistance of the stainless steel is further improved.

Disclosed are a corrosion-resistant film for a magnesium alloy wheel and a preparation method thereof, The corrosion-resistant film for a magnesium alloy wheel includes: a micro-arc oxidation (MAO) coating, a chemically blocked coating, a physical vapor deposition (PVD) high-density inorganic hybrid coating, a high oxidation-resistant powder coating which are sequentially stacked from inside to outside by using the magnesium alloy wheel as a substrate. In the present disclosure, based on a micro-arc oxidation technology, zirconium, titanium, an iron salt, nano silicon, polymer resin are added into an electrolytic solution, and under a constant voltage mode of an adjustable power supply, the MAO coating is generated on the surface of the magnesium alloy wheel, followed by chemical blocking; the PVD high-density inorganic hybrid coating is obtained by coating on the chemically blocked coating, physical blocking is performed; the high oxidation-resistant powder coating is spray-coated on the PVD high-density inorganic hybrid coating.

According to the manufacturing method, through a Roll to Roll continuous production mode, traditional 19 procedures are reduced to 12 procedures, the production speed is increased to 5 m / min, the dielectric constant of a composite PI film doped with nanometer aluminum oxide is smaller than or equal to 3.2 and is reduced by 15% compared with that of a traditional PI film, a micro-arc oxidation insulating layer of copper / magnesium alloy foil is combined, the signal loss of the antenna in the frequency band of 28-300 GHz is reduced by 30%, and the antenna performance is improved. The sheet resistance of the graphene / silver nanowire composite conductive adhesive is smaller than or equal to 0.1 omega / sq, the bending life is larger than or equal to 100,000 times, the performance is improved by 10 times compared with that of traditional silver paste, the long-term dynamic use requirement of wearable equipment is met, no chemical etching liquid is used in the whole process, waste is subjected to magnetic separation and low-temperature pyrolysis, waste discharge is reduced by 90% compared with a traditional process, and the graphene / silver nanowire composite conductive adhesive is environmentally friendly. The carbon-based particles generated through pyrolysis meet the RoHS standard and can be directly used for 3D printing consumables, the antenna produced through the method can adapt to the leading-edge fields of 6G base stations, flexible intelligent watches, implantable medical sensors and the like, and the technology of the Internet of Things and high-frequency communication is promoted.

The invention relates to the field of preparation of lubricating materials, in particular to a preparation method of composite phase change lubricating gel based on temperature-friction force synergistic response. The lubricating gel adopts a sandwich layered structure; the bottom layer is a porous ceramic layer formed by micro-arc oxidation, is filled with a disulfide bond dynamic network polymer and is anchored on a metal substrate; the middle layer comprises a microencapsulated phase change material which is dispersed in a polyurethane network containing dynamic disulfide bonds and is wetted with ionic liquid; the surface layer is an epoxy resin coating rich in boron nitride nanosheets, and a rapid heat conduction channel is constructed. Compared with the prior art, the lubricating state can be automatically adjusted in the friction process without external energy input, and the method has the advantages of being sensitive in multi-field coupling response, capable of achieving automatic antifriction protection, high in extreme working condition adaptability and the like.

Methods for producing durable oxide coatings on various substrates are provided. The method involves depositing an oxidizable metal layer, such as zirconium, aluminum, titanium, magnesium, or niobium, onto a substrate using physical vapor deposition techniques, including sputtering, evaporation, or cathodic arc deposition. The oxidizable metal layer is subsequently treated using anodization or micro-arc oxidation (MAO) to convert at least a portion of the layer into a robust oxide coating. The MAO process employs high voltages and current densities in an electrolytic bath containing water, salts, and additives to enhance surface properties. The resulting oxide layer provides exceptional hardness, corrosion resistance, thermal stability, and aesthetic finishes, including a black appearance. The method is compatible with diverse substrates, including metals, alloys, and plastics, enabling applications in aerospace, automotive, consumer electronics, and decorative industries. This approach overcomes limitations of traditional coatings by delivering tailored, high-performance surfaces.

The invention discloses a preparation process of a high-strength corrosion-resistant stainless steel fastener. The preparation process comprises the steps of material modification, warm upsetting forming, stabilizing treatment, cryogenic strengthening, gradient aging, surface treatment, post-treatment and the like. According to the process, the alloy component proportion is optimized, a thermal mechanical treatment technology of warm upsetting forming, subzero treatment and gradient aging is combined, a nano-composite coating and micro-arc oxidation sealing process is innovatively introduced, and the process comprises vacuum melting and controlled rolling of customized high-nitrogen stainless steel wires, deformation-induced martensite regulation in warm upsetting forming, low-temperature hot rolling, high-temperature hot rolling, high-temperature hot rolling, high-temperature hot rolling, high-temperature hot rolling and high-temperature hot rolling. The tensile strength and the salt spray corrosion resistance of the fastener are remarkably improved through deep cooling-medium temperature aging synergistic strengthening, double-layer nano TiN / CrN composite coating deposition and micro-arc oxidation micropore sealing treatment, the problem that a traditional stainless steel fastener is insufficient in strength and low in stress corrosion sensitivity is solved through the technology, and the technology is particularly suitable for the extreme environments such as aerospace and ocean engineering.

The invention discloses a method for preparing a non-polymer coating of a pure magnesium intravascular stent, and relates to the technical field of medical instruments, and the method comprises the following steps: pretreatment: immersing the pure magnesium intravascular stent into a diluted hydrochloric acid solution for ultrasonic cleaning, removing a surface oxidation film and impurities, then washing the pure magnesium intravascular stent with deionized water until the pure magnesium intravascular stent is neutral, and drying the pure magnesium intravascular stent for later use; micro-arc oxidation: taking the pretreated bracket as an anode, taking a stainless steel plate as a cathode, putting the bracket and the stainless steel plate in electrolyte, applying pulse voltage for treatment, and generating a ceramic oxide layer with the thickness of 5-20 microns on the surface of the bracket; and bioactive coating: immersing the stent subjected to micro-arc oxidation into the suspension, and depositing by adopting an electrophoretic deposition method to form a hydroxyapatite coating with the thickness of 1-5 microns. According to the non-polymer coating method for the pure magnesium intravascular stent, no polymer is used in the whole coating process, inflammatory reaction possibly caused by the polymer and degradation products of the polymer is avoided, and the biological safety of the stent is improved.

The invention relates to the technical field of anti-corrosion treatment, and provides anti-corrosion molding powder and a radiator anti-corrosion treatment technology.The anti-corrosion molding powder is prepared by taking polyethylene glycol terephthalate as a matrix and cooperating with a TGIC curing agent, phosphoric acid activated bamboo charcoal nanofibers, graphene modified zinc oxide, a lanthanum nitrate and cerous nitrate compound, a silane coupling agent and a functional additive; a composite resin system with a compact nano-structure is prepared through high-speed ball milling pre-activation and a twin-screw gradient extrusion process. The treatment process of the radiator comprises the steps of forming the ceramic substrate layer through micro-arc oxidation, performing dynamic temperature control impregnation with acrylic acid water-based paint, spraying anti-corrosion molding powder, performing microwave infrared gradient curing, and constructing a metal substrate-ceramic layer-organic coating multi-stage protection system. The permeability resistance of the coating is remarkably improved, a continuous and compact composite protection structure is formed, the problems of interface stripping, medium permeation and poor environmental adaptability of a traditional coating are solved, and the coating is suitable for the long-acting anti-corrosion requirement of the radiator under the high-corrosion working condition.

The invention discloses an enhanced tensile wear-resistant multi-twisted steel wire rope, which relates to the technical field of steel wire ropes, and structurally comprises a multi-twisted steel wire rope formed by twisting three sub-ropes in a left-to-right interactive manner, and each sub-rope is formed by twisting six stranded ropes in a right-to-right interactive manner; the aluminum-based carbon fiber composite core serves as the center of the stranded rope, and the gradient functional layer comprises six center steel wires on the inner layer, twelve micro-arc oxidation concave steel wires on the middle layer, eighteen graphene / zinc-aluminum coating convex steel wires on the outer layer and twelve phase change lubricating fiber bundles on the surface layer. The outer surface of the steel wire rope is sequentially coated with a self-repairing sealing layer containing repairing microcapsules, a boehmite / silane interface bonding layer and an Al2O3 / PEEK abrasion-resistant coating. The tensile strength and the structural stability are improved through a three-stage twisting process; the aluminum-based carbon fiber composite core and the gradient functional layer synergistically enhance core bearing, wear resistance and corrosion resistance; the phase change lubricating fiber bundles release lubricating components during friction, and damage repair is achieved through the self-repairing sealing layer; and the interface bonding layer and the wear-resistant coating strengthen the surface adhesive force and the wear resistance.

The invention belongs to the technical field of aluminum alloy surface treatment, and discloses an aluminum alloy micro-arc oxidation film layer with high plasma fluorination environment resistance and a preparation method thereof.The aluminum alloy serves as a matrix, the micro-arc oxidation film layer with high plasma fluorination environment resistance is formed on the surface of the matrix, the thickness of the film layer is 10-50 micrometers, the porosity is 3-5%, and the thickness of the film layer is 10-50 micrometers. The pore diameter is 0.5-1 [mu] m, and the alpha-Al2O3 accounts for 60-80%. According to the film layer, generation of more compact Al2O3 is promoted by adding zircon salt and yttrium salt, the structure and performance of the film layer are improved through introduced zirconium and yttrium elements, and the film layer has the advantages of being high in hardness, low in porosity, high in corrosion resistance and high in wear resistance.

The invention relates to the field of titanium alloy surface treatment, in particular to a preparation process of a nano-particle composite micro-arc oxidation coating suitable for a near-beta type titanium alloy. The preparation process comprises the following steps: step 1, degreasing treatment; step 2, membrane removal treatment; 3, performing nano-particle doping arc oxidation treatment to obtain a hard micro-arc oxidation film; and 4, PTFE paint film spraying treatment is conducted, and the PTFE paint film is obtained. The nano-particle composite micro-arc oxidation coating is of a double-layer structure, after nano-particle doped arc oxidation treatment, an inner-layer wear-resistant hard micro-arc oxidation film with the thickness being 20-30 microns and the average microhardness being 850 HV or above can be prepared on the near-beta-type titanium alloy, wear resistance and sufficient bearing capacity are provided for the composite coating, and by combining with an outer-layer PTFE paint film, the wear resistance of the composite coating is greatly improved. The near-beta type titanium alloy can be endowed with antifriction and wear-resistant double characteristics, a long-acting and lasting wear-resistant effect is provided, and the problem that the surface of a high-proportion beta phase in a matrix is not prone to oxidation is effectively solved.

The invention discloses a micro-arc oxidation coating for an artificial hip joint Ti6Al4V alloy and a preparation method of the micro-arc oxidation coating. The preparation method comprises the following steps that S1, pretreatment is conducted; s2, preparing a micro-arc oxidation electrolyte; s3, preparing a micro-arc oxidation coating; s4, cleaning and drying treatment; a preparation method of the electrolyte comprises the steps that 6 g of sodium metaaluminate solid powder, 4 g of potassium hydroxide solid powder, 2 g of sodium hexametaphosphate solid powder, 4 g of sodium silicate solid powder and 4 g of yttrium oxide nanoparticles are sequentially weighed and added into a beaker, then 980 mL of ultrapure water at the temperature of 60 DEG C is added into the beaker, and stirring is conducted for 2 min while the temperature is kept; the yttrium oxide particles are approximately spherical or ellipsoidal, the particle size range is 20-50 nm, and the purity is 99.99%. The yttrium oxide nanoparticles are introduced into the electrolyte, the micro-arc oxidation coating containing the yttrium oxide is prepared on the surface of the Ti6Al4V alloy, and compared with a traditional micro-arc oxidation coating, the surface porosity of the micro-arc oxidation coating containing the yttrium oxide is remarkably reduced, and the compactness is remarkably improved.

The invention discloses a coating for preventing the surface layer of an aluminum bar from being oxidized. The coating is composed of a porous composite ceramic inner coating and a high-entropy alloy outer coating. The preparation method of the porous composite ceramic inner coating is a micro-arc oxidation method, the porous composite ceramic inner coating comprises aluminum oxide and boron carbide, the coating is of a porous structure, pores are uniformly distributed, and the pore diameter is small. The preparation method of the high-entropy alloy outer coating is a laser cladding method, the components of the alloy are Al-Ti-Cr-Fe-Ni-Co, and the high-entropy alloy is simple in crystal structure and excellent in comprehensive performance and has an obvious improvement effect on an aluminum matrix as a coating. The coating is tightly combined with an aluminum matrix, the preparation method is simple and controllable, the strength and hardness of the aluminum bar are enhanced, the high-temperature oxidation resistance is good, the oxidation weight increment is remarkably reduced, and the comprehensive performance is excellent.

The invention relates to the technical field of surface strengthening treatment and coating preparation, in particular to a micro-arc oxidation electrolyte, a preparation method of the micro-arc oxidation electrolyte and a preparation method of an oxide ceramic coating on the surface of a magnesium-copper dissimilar metal material component. The invention provides a micro-arc oxidation electrolyte. The micro-arc oxidation electrolyte comprises a main film-forming agent, an arcing aid, a pH regulator, a corrosion inhibitor and water, the main film-forming agent comprises ammonium fluozirconate and / or potassium fluozirconate; the arcing aid comprises one or more of disodium hydrogen phosphate, sodium dihydrogen phosphate, ammonium dihydrogen phosphate and diammonium hydrogen phosphate; the corrosion inhibitor comprises one or more of hexamethylenetetramine, ammonium bifluoride and triethanolamine. The micro-arc oxidation electrolyte breaks through the problem that valve metal and non-valve metal cannot be subjected to arc discharge at the same time for micro-arc oxidation treatment in the micro-arc oxidation process.

The invention discloses a preparation method of a magnesium alloy corrosion-resistant thermal control coating, and relates to the technical field of metal surface treatment. The preparation method comprises the following steps: carrying out numerical control laser texturing treatment on the surface of the magnesium alloy with an oxide film removed; the magnesium alloy subjected to numerical control laser texturing treatment serves as an anode, micro-arc oxidation treatment is conducted, and a micro-arc oxidation coating is formed on the surface of the magnesium alloy so as to improve the corrosion resistance and thermal control performance of the magnesium alloy; wherein the electrolyte additive is nano copper oxide subjected to irradiation modification treatment. According to the method, the magnesium alloy surface is subjected to laser texturing treatment, so that more regular and ordered holes are formed in the magnesium alloy surface, the activity and roughness of the magnesium alloy surface are improved, on one hand, the thermal control performance of the micro-arc oxidation coating is improved, and on the other hand, the microstructure uniformity of the micro-arc oxidation coating is improved; the porosity of the micro-arc oxidation coating is remarkably reduced, and the corrosion resistance of the micro-arc oxidation coating is improved.

The invention relates to the technical field of space functional coatings, and discloses a magnesium alloy with a composite low-absorption coating and a preparation method of the magnesium alloy. The magnesium alloy comprises a magnesium alloy matrix, a micro-arc oxidation layer serving as a bottom coating and a magnetron sputtering deposition reflecting film serving as a surface coating. The phase of the micro-arc oxidation layer comprises SiO2, ZrO2, ZnO and MgO, and the phase of the magnetron sputtering deposition reflecting film comprises Si and SiO2. The invention provides a magnesium alloy with a multi-layer gradient composite low-absorption coating, which comprises a progressive gradient distribution multi-layer stacked strong-reflection micro-arc oxidation layer and a magnetron sputtering deposition reflecting film, and according to the stacking synergistic effect of the multifunctional coating and the thin film interference principle, the multi-layer gradient composite low-absorption coating is prepared. The magnesium alloy composite coating with multiple functional film layers connected in series for collaborative optimization is formed, excellent comprehensive performance is shown in the aspects of low absorption and corrosion resistance, and in addition, the coating also has excellent stability and space environment adaptability.

The invention belongs to the field of material surface treatment, and particularly relates to a preparation method of a nano-particle-doped micro-arc oxidation film layer. According to the method, a nano-particle dispersion liquid based on nano-silica sol is added into a micro-arc oxidation basic electrolyte through a micro-arc oxidation (MAO) technology, and a nano-particle-doped micro-arc oxidation film layer is prepared on the surface of a base material. Nano-silica sol is adopted as a dispersing agent, and through the synergistic effect of the nano-silica sol dispersing agent and the micro-arc oxidation reaction, the technical problems that in a traditional micro-arc oxidation process, nano-particles are difficult to dope, and the growth rate of a film layer is low are solved. By means of the method, different functional nano particles can be effectively doped into the micro-arc oxidation film layer, preparation of multiple functional ceramic film layers is achieved, and the film layers are high in binding force with a base body, high in growth rate, resistant to high temperature, good in insulativity, suitable for industrial batch production and capable of having certain social and economic value.