377 results about "Micro arc oxidation" patented technology

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 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 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 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.

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.

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 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 relates to the technical field of metal surface modification, in particular to a magnesium alloy anticorrosive coating and a preparation method and application thereof. The method comprises the following steps: firstly, performing micro-arc oxidation treatment on magnesium alloy to form a substrate layer; then, the micro-arc oxidation coating is subjected to hole sealing treatment through dendritic mesoporous silica loaded with a corrosion inhibitor, and the self-repairing function is given to the micro-arc oxidation coating; then, a layered self-similar coating composed of dendritic mesoporous silica loaded with a corrosion inhibitor and a resin matrix is constructed on the surface of the hole sealing layer, and interface bonding and compactness are enhanced; finally, dendritic mesoporous silica, cellulose nanocrystals, 1H, 1H, 2H, 2H-perfluorodecyl triethoxy silane, organic resin and tetraethoxy silane are introduced, and the super-hydrophobic coating with a micro-nano composite firm structure is formed on the surface layer. The obtained magnesium alloy anti-corrosion coating integrates the characteristics of long-acting corrosion resistance, super-hydrophobicity, self-repairing, high mechanical stability and the like, and the technical problems that a traditional magnesium alloy anti-corrosion coating is prone to physical or chemical damage and insufficient in durability are effectively solved.

The application discloses an amorphous silicon dioxide coating prepared based on micro-arc oxidation, a preparation method and application thereof, and belongs to the technical field of metal surface protection and silicon dioxide coating. In the application, a magnesium alloy, an aluminum alloy, a titanium alloy, a titanium-aluminum base and a nickel-aluminum base are used as anodes and are placed in a micro-arc oxidation tank, a hydrolytic solution of organic silicon is used as an electrolyte, and an amorphous silicon dioxide coating with a thickness of more than 100 mu m can be prepared within 20 minutes through a step-by-step step-incremental constant potential control means. The application utilizes the advantages of the micro-arc oxidation process and the sol-gel process, avoids their shortcomings, and realizes the superimposed synergistic effect of "1+1>2". The process steps of the application are simple, and the application is very suitable for full-automatic operation and processing in industry. The amorphous silicon dioxide coating with the required thickness, wear resistance, corrosion resistance, erosion resistance, oxidation resistance and other characteristics can be prepared by changing the electrolyte concentration, the micro-arc oxidation time and the electric control parameters, or through the conventional micro-arc oxidation constant voltage and constant current control means.

The invention relates to the technical field of metal surface protective coatings, in particular to a corrosion-resistant coating for a building aluminum template and a preparation method of the corrosion-resistant coating. The problems that a coating is prone to failure under the stress-corrosion synergistic effect, and the protection service life is short are solved. The coating comprises an organic silicon hybrid bottom layer, a dual-carrier corrosion inhibitor energy storage layer, a microcapsule self-repairing layer and a wear-resistant super-hydrophobic top layer. An oxidized ceramic layer is generated on the surface through micro-arc oxidation, and then a bottom layer is formed through dip-coating of organic silicon hybrid sol and curing; dispersing the porous silicon dioxide microspheres loaded with the corrosion inhibitor and layered double hydroxides in water-based resin to prepare an energy storage coating, and forming a corrosion inhibition energy storage layer; urea resin microcapsules and gelatin-Arabic gum microcapsules are added into a resin matrix to prepare a self-repairing coating, and a self-repairing layer is formed; and finally, mixing the fluorosilane-modified nano aluminum oxide and nano silicon dioxide with wear-resistant organic silicon resin to form a super-hydrophobic top layer.

The invention discloses a magnesium alloy micro-arc oxidation electrolyte which comprises sodium metaaluminate, sodium hydroxide, sodium fluoroaluminate, aluminum fluoride and glycerol. The content of sodium metaaluminate is 5-25 g / L, the content of sodium hydroxide is 1-3 g / L, the content of sodium fluoroaluminate is 0.3-0.7 g / L, the content of aluminum fluoride is 0.2-0.3 g / L, and the content of glycerol is 1 g / L. The magnesium alloy micro-arc oxidation electrolyte comprises potassium metaaluminate, potassium hydroxide, potassium fluoroaluminate, aluminum fluoride and glycerol, the content of potassium metaaluminate is 10-20 g / L, the content of potassium hydroxide is 3-5 g / L, the content of potassium fluoroaluminate is 0.5-0.7 g / L, the content of aluminum fluoride is 0.3-0.5 g / L, and the content of glycerol is 1 g / L. The invention further discloses the magnesium alloy hard ceramic membrane and a preparation method thereof. According to the preparation method of the magnesium alloy hard ceramic film, the components and the microstructure of the magnesium alloy micro-arc oxidation film layer are changed, and meanwhile the hardness and the corrosion resistance of the magnesium alloy micro-arc oxidation film layer are improved.

The present application relates to a kind of high-temperature-resistant inductive angle sensor, belong to angle sensor technical field.The sensor includes: gradient composite ceramic substrate Al2O3-ZrO2-Al2O3, realize thermal expansion coefficient gradient matching by intermediate layer zirconium oxide doped yttrium oxide, reduce thermal stress cracking risk;Substrate surface is formed with micro-arc oxidation porous layer in turn titanium nitride nanocrystalline layer, improve surface bonding force;Atomic layer deposition process is used to prepare TiN or TiN / Ag composite film coil, improve temperature resistance;Through electron beam welding and transient liquid phase bonding composite process coil and circuit;Insulating encapsulation layer is made of boron nitride nanosheet and high-temperature-resistant resin, improve thermal conductivity and breakdown field strength.The present application is through gradient substrate design, thin film coil integration and composite process optimization, solves the thermal stress failure of traditional inductive sensor under high temperature, coil oxidation and insulation aging problem, suitable for angle measurement under extreme environment.

A preparation method of a 7B04 aluminum alloy surface in-situ synthesis microparticle enhanced thermal control function film layer can effectively improve the density of the film layer, meanwhile, the film layer is high in infrared emissivity and good in thermal control function, and comprises the steps that firstly, the 7B04 aluminum alloy surface, copper oxide and chromic oxide are pretreated, then a micro-arc oxidation electrolyte is prepared, and the 7B04 aluminum alloy surface is subjected to in-situ synthesis; the pretreated 7B04 aluminum alloy is placed in a stainless steel electrolytic cell of micro-arc oxidation equipment, then the micro-arc oxidation electrolyte is added into the stainless steel electrolytic cell, micro-arc oxidation treatment is conducted on the aluminum alloy through a micro-arc oxidation power source, the electrolyte is continuously stirred in the oxidation treatment process, and the aluminum alloy is subjected to micro-arc oxidation treatment; and finally, obtaining an in-situ synthesized microparticle reinforced thermal control functional film layer on the surface of the 7B04 aluminum alloy, washing the film layer with deionized water, and naturally airing the film layer to obtain the 7B04 aluminum alloy. The composition of the micro-arc oxidation electrolyte is designed, in the growth process of a micro-arc oxidation film layer, copper chromite black particles are synthesized in situ through chemical reaction, the particles and the film layer are metallurgically bonded, and the method has actual application and popularization value.

According to the single-polarized omnidirectional ceiling antenna provided by the utility model, the micro-arc oxidation ceramic layer is arranged on the surface of the aluminum radiation oscillator, so that oxidation and corrosion of the aluminum radiation oscillator are effectively prevented, and the copper plating layer is arranged on the micro-arc oxidation ceramic layer, so that the conductivity of the aluminum radiation oscillator is improved, and the signal transmission quality of the antenna is improved. And finally, a layer of nickel-phosphorus alloy is plated on the copper plating layer, so that the radiation oscillator has good wear resistance and hardness, the durability and the stability of the radiation oscillator are improved, the cost is greatly reduced compared with a copper radiation oscillator, and the radiation oscillator is suitable for different use environments. In addition, a plurality of copper short-circuit sheets coated with ferrite wave-absorbing coatings are arranged on the peripheral side of the radiation oscillator at equal intervals, so that the performance of the antenna is further optimized, and the anti-interference capability and the signal transmission efficiency of the antenna are improved.

This invention provides a micro-arc oxidation electrolyte for magnesium alloy surface treatment and a method for preparing a micro-arc oxidation film. The micro-arc oxidation electrolyte is an aqueous solution containing sodium silicate, sodium hydroxide, potassium fluoride, and titanium boron carbon nitride conductive nanoparticles; or, an aqueous solution containing sodium silicate, potassium hydroxide, potassium fluoride, and titanium boron carbon nitride conductive nanoparticles. This invention also discloses a method for preparing a micro-arc oxidation film using the aforementioned micro-arc oxidation electrolyte for magnesium alloy surface treatment. The micro-arc oxidation electrolyte of this invention contains conductive ceramic nanoparticles—titanium boron carbon nitride conductive nanoparticles. Using these nanoparticles to perform a micro-arc oxidation reaction on the magnesium alloy surface can improve the microstructure of the micro-arc oxidation film, while simultaneously enhancing the corrosion resistance and wear resistance of the magnesium alloy after micro-arc oxidation treatment, significantly improving the surface protection capability of the magnesium alloy, and extending its service life.

The invention discloses a preparation method of a magnesium alloy surface micro-arc oxidation corrosion inhibition coating, which comprises the following steps: placing a magnesium alloy as an anode in a micro-arc oxidation electrolyte, and carrying out constant-current micro-arc oxidation by taking stainless steel as a cathode to form the micro-arc oxidation corrosion inhibition coating on the magnesium alloy surface, the micro-arc oxidation electrolyte comprises 5-30 g / L of sodium hydroxide, 20-50 g / L of sodium metasilicate, 5-10 g / L of sodium carbonate and 1-8 g / L of a micro container, and a solvent is water; the carrier of the microcontainer is mesoporous silica, the inorganic corrosion inhibitor is located on the inner side of a mesoporous channel of the mesoporous silica, and the organic corrosion inhibitor is located on the outer side of the mesoporous channel; and part of the organic corrosion inhibitor and divalent metal ions form an insoluble complex to cover the port of the mesoporous channel. The coating prepared through the method has the self-catalysis dual self-repairing function, the self-repairing problem of local damage of the micro-arc oxidation coating is further solved, and then the corrosion protection performance of the magnesium alloy micro-arc oxidation coating is further improved.

The invention discloses a gradient composite reinforced anti-corrosion treatment method for a metal alloy guardrail, and belongs to the technical field of metal material surface treatment. The method comprises the following steps: carrying out ultrasonic cavitation micro-etching and electrochemical gradient activation pretreatment on the surface of a substrate; a metal ceramic composite layer containing a non-oxide ceramic reinforced phase is generated on the surface in situ through a micro-arc oxidation-chemical vapor deposition coupling process, and a component transition layer is formed with the assistance of vacuum gradient diffusion alloying treatment; and finally, coating an intelligent resin coating containing a corrosion inhibitor capsule and a corrosion indicator, and constructing a super-hydrophobic surface. By constructing a multi-layer composite protection system of the gradient diffusion layer / the metal ceramic layer / the intelligent coating / the super-hydrophobic layer, the anti-corrosion performance is remarkably improved, and the obtained guardrail has excellent bonding strength, wear resistance and long-acting anti-corrosion service life, has the intelligent functions of damage self-repairing and corrosion state visualization and is suitable for popularization and application. The method is especially suitable for harsh service environments.

The application relates to a preparation method of a coal-based hard carbon negative electrode material and application thereof, and belongs to the field of secondary battery material preparation. The application aims at solving the problems that the coulomb efficiency and reversible charge-discharge specific capacity of the prepared hard carbon material are low after high-temperature treatment of the existing coal-based precursor, the operation of acid washing removal is relatively complex, and the used hydrofluoric acid is relatively dangerous. The preparation method comprises the following steps: one, descaling treatment; two, micro-arc oxidation treatment; and three, carbonization. Application: the application is used for preparing a secondary ion battery negative electrode material. The application is used for the preparation of the coal-based hard carbon negative electrode material and the application thereof.

Disclosed in the present invention is a ceramization composite process applied to a metal substrate, comprising the following steps: 1) performing micro-arc oxidation treatment on a metal substrate; and 2) performing post-treatment on the metal substrate obtained in step 1). In the present invention, micro-arc oxidation treatment is performed on the metal substrate, which may result in micro-arc oxidation ceramic films of different colors on the surface of the metal substrate, the colors are uniform, and the appearance is beautiful; and then post-treatment is performed on the metal substrate to form protection for the micro-arc oxidation ceramic films and fill micro-pores of the micro-arc oxidation ceramic films, such that micro-film pores on the surface of the metal substrate undergone the micro-arc oxidation treatment are sealed, thereby greatly improving the stain resistance, weatherability, and surface hardness of the metal substrate, preventing film layer pulverization or cracking after the metal substrate is impacted, and solving the problems of poor stain resistance caused by the presence of micro-pores on surfaces, poor weatherability and insufficient surface hardness caused by open and unsealed film pores, and high hardness and brittleness of micro-arc oxidation films of existing micro-arc oxidation processes.

The application relates to the technical field of power connection device manufacturing, in particular to a manufacturing method of a track socket busbar, a composite busbar and a track socket, and aims to solve the problems that although a traditional silver plating process can delay copper-based oxidation, the silver layer is easy to wear and the cost is high, and although a micro-arc oxidation layer of an aluminum-based busbar has insulation, a porous structure is easy to absorb moisture, leading to a decrease in corrosion resistance. The application forms a silver-nickel alloy layer with metallurgical bonding through laser surface alloying, generates an in-situ ceramic insulation layer through micro-arc oxidation, and realizes stable compounding of copper-aluminum substrates by using a mechanical occlusion structure, so that the advantages of synchronously improving the electric conductivity and the corrosion resistance and solving the interface delamination problem are achieved.

The invention discloses a manufacturing process of a corrosion-resistant aluminum alloy flange plate. The manufacturing process comprises the following steps that S1, alloy smelting and component control are conducted; s2, homogenizing heat treatment; s3, hot die forging forming; s4, solution treatment; s5, multi-stage artificial aging; and S6, surface treatment. According to the flange plate and the manufacturing method thereof, through the unique alloy component design and the combination of the whole-process optimization technology of precise smelting, homogenization, die forging, solid solution, multi-stage aging and micro-arc oxidation, cooperative regulation and control of intracrystalline strengthening and grain boundary purification are achieved on the microstructure, and finally the flange plate product with excellent comprehensive performance is obtained.

The present application relates to the technical field of composite biological coating. Specifically, the present application relates to a hydrophobic composite layer on a medical degradable magnesium alloy substrate and a preparation method thereof. In the preparation method, firstly, a porous ceramic oxide layer is formed on the magnesium alloy substrate through micro-arc oxidation treatment, so as to reduce the corrosion rate of the magnesium alloy; then, a strontium-doped hydroxyapatite layer is prepared on the surface of the micro-arc oxidation layer using a chemical deposition method, so as to improve the biocompatibility of the magnesium alloy; finally, the magnesium alloy subjected to the micro-arc oxidation and chemical deposition treatment is immersed and pulled once or more times in a polylactic acid solution containing nano-hydroxyapatite, so as to form a hydrophobic polymer layer. The hydrophobic composite layer prepared by the present application improves the corrosion resistance and biocompatibility of the magnesium alloy at the same time. The present application also relates to a magnesium alloy implant product comprising the hydrophobic composite layer.

The application relates to a method for preparing a porous structure Al2O3 / Al ceramic metal coating on the surface of an aluminum-based composite material, and belongs to the technical field of surface treatment of aluminum-based composite materials. The application aims to solve the problems of the prior art, such as complicated preparation of ceramic-metal composite materials, uncontrollability, high cost, difficulty in balancing the strength and toughness of the composite material, and insufficient regulation of the thermal conductivity. The method comprises the following steps: I, pretreating the surface of the aluminum-based composite material; II, preparing a porous micro-arc oxidation coating; and III, preparing an Al2O3 / Al ceramic coating with a complete structure. The multilayer structure composite material prepared by the application has more excellent mechanical properties (high resistance to friction and wear, high thermal shock resistance, adjustable thermal expansion coefficient, high fracture toughness) and high thermal conductivity (>=100 W / mK), and has important significance for the upgrading of future packaging substrate materials and the development of composite materials for harsh deep-sea, deep-space and deep-earth environments.

The application relates to a preparation method of a tin dioxide negative material, and belongs to the technical field of lithium battery negative material synthesis. The application aims at solving the problems of the existing SnO2 negative material, such as large volume effect in the charging and discharging process, easy falling off on the current collector, complex preparation process of the SnO2 negative material and high cost. The preparation method comprises the following steps: S1, preparing a micro-arc oxidation electrolyte; S2, placing a titanium foil and the micro-arc oxidation electrolyte in a micro-arc oxidation electrolytic tank, taking the titanium foil as a positive electrode and a stainless steel plate as a negative electrode; and S3, micro-arc oxidation. The application is used for the preparation of the tin dioxide negative material.

The utility model relates to the technical field of metal workpiece production, and discloses a multi-stage filter device for metal workpiece micro-arc oxidation production, which comprises an electrolytic tank, a connecting column is vertically arranged on the inner side of the electrolytic tank, and a plurality of filter screens are vertically arranged on the outer wall of the connecting column in an array manner. The upper end face of the uppermost filter screen is connected with a lifting assembly used for lifting the multiple filter screens, a plurality of guiding assemblies are arranged on the upper end face of the electrolytic tank in an annular array mode, when electrolyte needs to be filtered, the filter screens are lifted to the position above the electrolytic tank through the lifting assembly, and the electrolyte is filtered through the multiple stages of filter screens step by step. And impurities and particles in the electrolyte are removed, at the moment, the impurities are accumulated on the multiple filter screens, separation of the electrolyte and the impurities is completed, the filtered electrolyte is purer, improvement of the quality and efficiency of micro-arc oxidation treatment is facilitated, and the main function of the guide assembly is to ensure that the lifting assembly is kept stable in the lifting process and friction is avoided.

The invention discloses a titanium metal dental implant and a processing method thereof, and belongs to the technical field of medical instruments, the surface of an implant part of the implant is provided with a composite bioactive layer, and the composite bioactive layer is formed by compounding a first-stage micron hole layer formed by selective laser micro-melting and a second-stage submicron-nano mesh hole layer formed by micro-arc oxidation, and the secondary pore layer has gradient distribution of bioactive elements such as calcium and phosphorus. The processing method comprises the steps of matrix pretreatment, construction of a micron structure through selective laser micro-melting, synchronous construction of a nano structure through micro-arc oxidation, element gradient doping and post-treatment. The surface of the prepared implant has a unique micron-nano graded composite pore structure and gradient distribution of bioactive elements, the mechanical stability and the biological activity of the implant can be synergistically promoted, rapid and stable osseointegration is realized, the processing method is green and controllable, and the implant has a good application prospect.