347 results about "Mg alloys" patented technology

The invention discloses composite powder, a metal anti-corrosion coating composition, a preparation method of the metal anti-corrosion coating composition and a metal anti-corrosion method. Zn < 2 + > and imidazole ligands are self-assembled on the surface of GO in situ in DMF to prepare composite powder with stable pore channels and barrier and self-repairing functions, and the composite powder is dispersed in an epoxy matrix to prepare the coating. When the coating is damaged, the MOF releases Zn < 2 + > to form a passive film with the ligand, and the GO network delays medium diffusion and enhances mechanical properties. And the coating has remarkable salt mist resistance and self-repairing performance, and is suitable for corrosion prevention of metals such as steel, aluminum-magnesium alloy and the like.

The invention discloses a low-cost, flame-retardant, high-strength, high-thermal-conductivity and corrosion-resistant Mg-Al-Ca-Mn alloy and a preparation method thereof, relates to an Mg-Al-Ca-Mn alloy and a preparation method thereof, and aims to solve the problem that an existing magnesium alloy is difficult to meet the requirements of high plasticity, corrosion resistance, thermal conductivity and flame resistance at the same time. The invention provides a low-cost, high-strength, corrosion-resistant, heat-conducting and flame-retardant Mg-Al-Ca-Mn-X alloy, X is one or a combination of more of Y, Gd, La, Ce, Sm and Nd according to any ratio, the microstructure of the alloy is regulated and controlled through alloy component optimization, rare earth microalloying, a heat treatment process and a plastic deformation process, and the mechanical property of the alloy is improved. The alloy prepared by the invention has excellent mechanical property, corrosion resistance, heat-conducting property and flame retardant property. The method is applied to the field of metal materials.

The invention discloses a magnesium alloy corrosion resistance prediction method based on machine learning, and relates to the technical field of metal material performance prediction.The method comprises the following steps that magnesium alloy corrosion resistance data are obtained and preprocessed, and a magnesium alloy data set is obtained; aiming at a random forest algorithm and a gradient boosting tree algorithm, training, optimizing and evaluating the prediction model by using the magnesium alloy data set to obtain an optimal prediction model; and for the optimal prediction model, inputting components and environmental parameters of the magnesium alloy, and outputting a corrosion resistance prediction value. According to the method, the prediction precision and the material design efficiency can be remarkably improved, the method is suitable for biomedical application of orthopedic implants, intravascular stents and the like, and an efficient and reliable technical path is provided for research and development of the degradable magnesium alloy.

The utility model discloses an electromagnetic compatibility assessment device, and belongs to the technical field of wireless communication. The equipment comprises a data processing module, a signal generator module, a low-frequency / high-frequency amplifier, a combining unit, a shielding frame and a power supply module, and accurate evaluation of the electromagnetic compatibility of the weak current equipment is realized through modular design. The signal generator module adopts a multi-band vector signal generator to generate configurable interference signals; the low-frequency amplifier and the high-frequency amplifier respectively adopt independent high-precision amplification circuits; and the combining unit couples the two paths of signals into a composite interference signal and outputs the composite interference signal. The shielding frame is made of double-layer aluminum magnesium alloy and is combined with a metal machine frame to form a composite shielding system. And the data processing module regulates and controls parameters in real time through the touch screen, analyzes response data of the tested equipment based on an FFT algorithm, and generates a visual evaluation report.

The invention belongs to the field of bladder cancer treatment, and particularly relates to a drug delivery system based on combination of a biodegradable magnesium alloy stent and a double-J tube. The system comprises a biodegradable magnesium alloy stent and a double-J tube, the surface of the biodegradable magnesium alloy stent is modified by a calcium phosphate coating to form a fine needle-shaped micro-nano structure, and the biodegradable magnesium alloy stent loads an anti-cancer drug oridonin. The biodegradable magnesium alloy stent loaded with oridonin is accurately attached to a tumor part by means of ultrasonic guidance, and the double-J tube and the biodegradable magnesium alloy stent are combined for use. According to the invention, the loading efficiency of the hydrophobic drug is improved through the modification of the micro-nano structure of the calcium phosphate coating, and the anti-tumor effect of the magnesium degradation product is cooperated, so that the problems of high frequency, high toxicity and poor compliance of traditional bladder cancer perfusion treatment and difficulty in delivery of Ori and other natural drugs are solved, and finally, accurate, long-acting and low-toxicity treatment of bladder cancer is realized.

This invention relates to the field of magnesium primary battery preparation technology, and discloses a magnesium aqueous primary battery system, including a positive electrode, a negative electrode, and an electrolyte. The negative electrode is any one of magnesium metal and magnesium alloy. The positive electrode is made of a positive electrode active material, superconducting carbon, and a first-order gelatinizing agent. The electrolyte is made of magnesium bromide, a corrosion inhibitor, and a second-order gelatinizing agent. The preparation method includes the following steps: S1: preparing a positive electrode slurry; S2: preparing an electrolyte by introducing a corrosion inhibitor into the magnesium bromide electrolyte, followed by adding a second-order gelatinizing agent for gelatinization treatment to obtain a slow-release gelatinized electrolyte; S3: preparing a positive electrode steel shell; S4: assembling the battery. The technical solution of this invention not only slows down the corrosion rate of the negative electrode material and improves the utilization rate of the negative electrode material, but also solves the problems of voltage hysteresis and volume expansion during battery discharge; furthermore, it can match the reaction rates of the positive and negative electrodes.

The invention provides a high-toughness austenitic stainless steel welding rod for 5Ni steel and a preparation method of the high-toughness austenitic stainless steel welding rod. The welding rod comprises a core wire and a coating coated on the surface of the core wire, and based on the total amount of the core wire, the core wire comprises the following components in percentage by mass: less than or equal to 0.09% of C, less than or equal to 0.15% of Si, 1.6-2.5% of Mn, 18.5-20.5% of Cr, 12.5-14.5% of Ni, 2.1-3.2% of Mo and 0.06-0.18% of Ti; 0.12-0.24% of Al, less than or equal to 0.007% of S, less than or equal to 0.008% of P, less than or equal to 0.006% of O, less than or equal to 0.001% of H, less than or equal to 0.012% of S + P, and the balance Fe and inevitable impurities. On the basis of the total amount of the coating, the coating comprises, by mass, 28-38% of carbonate, 15-20% of fluorite, 1-3% of lithium fluoride and sodium fluoride, 8-12% of synthetic mica, 3-6% of potassium silicotitanate, 2-4% of zircon sand, 9-15% of electrolytic manganese metal, 2-4% of ferrotitanium, 2-5% of passivated nickel-magnesium alloy, 1-3% of atomized ferrosilicon, 1-3% of lanthanum cerium fluoride, 1-3% of tungsten and molybdenum, 3-5% of nitrided ferrochromium and 1-2% of CMC. The welding rod is good in all-position welding controllability, extremely low in air hole sensitivity and excellent in low-temperature toughness, and can meet the requirements for high-quality and efficient welding of 5Ni steel.

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 invention discloses a magnesium-titanium composite material with an interpenetrating phase structure for bone implantation, the magnesium-titanium composite material is formed by interpenetrating a reinforced phase made of a titanium alloy material and a matrix phase made of magnesium or a magnesium alloy material, and the reinforced phase and the matrix phase are respectively kept continuous in a three-dimensional space; a reinforcing phase and a matrix phase of the magnesium-titanium composite material have gradient structures in the radial direction; the invention further discloses a preparation method of the interpenetrating phase structure magnesium-titanium composite material for bone implantation. According to the magnesium-titanium composite material disclosed by the invention, the structure is designed into a structure in which the reinforcing phase and the matrix phase are three-dimensionally continuous and interspersed with each other and the two phases are in gradient in the radial direction, so that the magnesium-titanium composite material implant and healthy bone tissue at a bone defect part of a patient realize good biomechanical adaptation; the material is suitable for being used as a bone implant in the field of biomedical metal materials.

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 field of medical instruments and public health, in particular to an artificial blood vessel with anticoagulation, endothelium promotion and bending resistance functions and a preparation method of the artificial blood vessel, and the artificial blood vessel is used for various blood vessel replacement and blood vessel bypass operations and has the characteristics of anticoagulation, endothelium promotion and bending resistance. The copper-containing material and the degradable magnesium-based metal material are respectively integrated on the inner surface of the artificial blood vessel and in the interlayer of the vessel wall, so that the functions of anticoagulation, endothelium promotion and bending resistance of the artificial blood vessel are realized. According to the artificial blood vessel with the anticoagulation, endothelium promotion and bending resistance functions, in the initial stage of use, due to the spiral structure of the magnesium alloy wire, the blood vessel cannot collapse after being bent, the blood flow is kept smooth, copper ions, magnesium ions and a small amount of hydrogen can be released to surrounding tissues in the use process, the microenvironment of the surrounding tissues is adjusted to be alkalescent, and the blood circulation is kept smooth. Through the synergistic effect of the copper ions and the magnesium alloy, the effects of promoting endothelialization, resisting blood coagulation and adjusting the acid-base property of the microenvironment are achieved at the same time, and therefore the functions of resisting blood coagulation, promoting endothelium and resisting bending are achieved.

The invention discloses a corrosion-resistant and collagen-functionalized magnesium-based metal coating and a preparation method of the corrosion-resistant and collagen-functionalized magnesium-based metal coating. Belongs to the technical field of biomedical material preparation. The preparation method comprises the following steps: firstly introducing hydroxyl into the surface of the magnesium alloy through alkali treatment, then sequentially dipping the magnesium alloy into a solution A and a solution B containing specific copolymers, drying to obtain an anti-corrosion coating, and finally coating with a recombinant humanized collagen solution. The copolymer A in the solution A and a magnesium substrate form a firm Si-O-Mg covalent bond through a silane coupling agent, and the fluorine-containing copolymer B in the solution B is tightly combined with a bottom layer through self-assembly, so that a super-hydrophobic anti-corrosion barrier with a stable structure and strong adhesion is constructed. The outermost collagen layer endows the magnesium alloy material with excellent endothelial cell adhesion and proliferation promoting activity. The multi-layer composite coating structure effectively solves the problems that magnesium alloy degradation is too fast, and an existing coating is weak in binding force and lacks biological functions, and has wide application prospects in implantable medical devices such as intravascular stents.

The invention relates to the cross technical field of material calculation and machine learning, and discloses a magnesium alloy grain boundary segregation site determination method based on a physical information graph neural network, and the method comprises the following steps: extracting initial geometric structure information of a target grain boundary site and adjacent atoms thereof, and obtaining feature vectors of initial nodes and edges; performing message passing on the initial node and the edge feature vector based on a mathematical analysis form and an update function embedded with physical information to obtain an updated node feature vector; carrying out aggregation processing on the updated node feature vectors to generate a grain boundary structure descriptor used for representing the local atomic environment of the grain boundary site; and inputting the grain boundary structure descriptor into a pre-trained machine learning regression model to obtain a solute segregation performance predicted value of the target grain boundary site. According to the method, the calculation of segregation energy is converted into efficient machine learning prediction from high-cost physical simulation, and the calculation efficiency is greatly improved.

The utility model discloses an anti-corrosion structure of an electrical equipment shell and an electric drive assembly, and relates to the technical field of anti-corrosion, the electrical equipment shell comprises a first shell and a second shell, the first shell and the second shell are made of different metal materials, and the first shell is made of magnesium alloy; the anti-corrosion structure comprises a first flow guide part and a second flow guide part, the first flow guide part is arranged at the bottom of the first shell in the using state, and the second flow guide part is arranged on the side face of the electrical equipment shell in the using state. According to the utility model, through the first flow guide piece and the second flow guide piece, the salt mist liquid can be prevented from being gathered at the joint surfaces of the first shell and the second shell, so that the corrosion condition is reduced. Therefore, the anti-corrosion performance of the electrical equipment shell can be improved.

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 provides an orthopedic implant or a component thereof comprising a biodegradable magnesium alloy comprising magnesium and Ca in the range of 0.550 to 0.700 wt%, Zn in the range of 0.400 to 0.700 wt%, and 50 ppm or less Fe, the biodegradable magnesium alloy consisting of two phases comprising a first phase and a second phase having a higher electrochemical activity than the first phase, the first phase comprises magnesium and Zn, and the second phase comprises Mg2Ca precipitates greater than nanoscale. The present application also provides a method of making a biodegradable magnesium alloy, a method of making an orthopedic implant or component thereof, and a method of treating a subject in need of therapy for a medical condition of bone.

The invention relates to an advantageous composition for its use in a glass manufacturing process, comprising (i) at least a calcium raw material and (ii) at least a calcium-magnesium raw material, with when CaO is ≥ 4*MgO in said composition, said calcium-magnesium raw material is hydrated dolime; and when CaO is < 4*MgO in said composition, said calcium raw material is hydrated lime.

The invention discloses a preparation method of a hydrogen-responsive composite multilayer magnesium-based film surface self-wrinkle pattern. The preparation method comprises the following steps: A, preparing a polymer elastic layer on the surface of a supporting substrate; b, depositing a plurality of layers of metal-based films on the polymer elastic layer by adopting a magnetron sputtering method; and C, exposing the prepared sample in a hydrogen-containing atmosphere, and forming a wrinkle pattern of which the recognizable size is in a range of 10nm-1000mu m on the surface through hydrogenation reaction at normal temperature. According to the method, the surface of the thin film can be deformed by exposing the thin film to the hydrogen-containing atmosphere environment, so that the three-dimensional wrinkle texture can be quickly realized, and the three-dimensional wrinkle morphology can be accurately regulated and controlled by adjusting the element components, sputtering time, sputtering power, working gas flow and hydrogen treatment parameters of the magnesium or magnesium alloy hydrogen-sensitive reaction film layer. The pattern features of the prepared wrinkle pattern can be recognized through characterization means such as an optical microscope, a scanning electron microscope, an atomic force microscope or a diffraction light-variable device.

This invention provides a magnesium anode material with a dislocation density gradient structure based on asynchronous rolling, its preparation method, and its application, relating to the field of anode material technology. The magnesium anode material of this invention is prepared by raw material melting and casting, solution treatment, extrusion molding, and asynchronous rolling. The magnesium anode material includes no more than 0.1 wt.% zirconium, with the balance being magnesium and unavoidable impurities. The dislocation density of the magnesium anode material increases gradient from the surface to the core. This invention introduces a dislocation density structure with a gradient from the surface to the core into magnesium alloy sheets through asynchronous rolling, thereby obtaining a magnesium anode material with both high discharge activity and good corrosion resistance, improving its overall discharge performance in magnesium-air batteries. The preparation process of the magnesium anode material of this invention is simple, highly controllable, and easy to scale up, possessing good industrialization potential.

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 utility model relates to a large area contact type thread type degradable magnesium alloy aortic blood vessel anastomat, including the conical inner ring, conical outer ring and sleeve outer ring that set gradually from inside to outside, be provided with blood vessel clamping space between the conical inner ring and conical outer ring, it is the thread cooperation between conical outer ring and sleeve outer ring, adjust the size of blood vessel clamping space through the rotation sleeve outer ring, sleeve outer ring. The utility model simple structure, reasonable in design, convenient to use, adjust the size of blood vessel clamping space through the rotation conical outer ring and sleeve outer ring to fixed blood vessel, realize blood vessel anastomosis fast, avoid the mode of the traditional everted type through end face combination simultaneously, greatly increase the contact area between blood vessel and prevent the occurrence of blood leakage.

The invention discloses a magnesium alloy semi-solid forming method and system. The method comprises the steps that target physical parameter data of a magnesium alloy to be machined are obtained; extracting general physical parameter data matched with the set physical parameter data of the sample magnesium alloy from the target physical parameter data, and determining specific physical parameter data except the general physical parameter data in the target physical parameter data; universal simulation data matched with the universal physical parameter data are obtained from a simulation database, the simulation database is used for storing semi-solid forming simulation data of the magnesium alloy sample, and the semi-solid forming simulation data are obtained by conducting semi-solid forming simulation through CAE according to the set physical parameter data; cAE is used for semi-solid forming simulation based on the specific physical parameter data and the general simulation data to obtain a semi-solid forming simulation result, and the simulation result is used for optimizing the semi-solid forming process parameters of the magnesium alloy to be machined, so that the simulation operation amount can be reduced, and the simulation operation duration can be shortened.

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 the technical field of metal surface protection materials, in particular to a magnesium alloy surface protection material, a preparation method and application thereof, which contains 40-60 parts of a fluorocarbon resin matrix, 30-50 parts of functional fillers, 5-10 parts of corrosion inhibitors, 3-8 parts of cross-linking agents, 0.5-2 parts of catalysts and 1-3 parts of additives; the functional fillers are modified to form a 'core-shell' structure, graphene is loaded with nano zinc oxide, and fluorophosphoric calcium whiskers are coated with rare earth cerium salt; the preparation process comprises resin interpenetrating network formation, filler pretreatment, pre-crosslinking, catalytic crosslinking and grinding; the material forms a three-dimensional protection system, the hardness is greater than or equal to 3H, the adhesion is less than or equal to 1 grade, the salt mist resistance is greater than or equal to 1000h, the self-repairing efficiency is greater than or equal to 90%, and the high-low temperature cycle resistance is excellent. The application has comprehensive protection performance, synergistic effects of physical shielding, chemical corrosion inhibition and self-repairing, good adhesion and weather resistance, strong high-low temperature resistance and corrosion resistance, and stable process, and can provide reliable and long-acting protection for magnesium alloys.

The invention provides a preparation method of a flaky magnesium-based material, and relates to the technical field of magnesium-based material preparation. The preparation method of the flaky magnesium-based material comprises the following specific steps that S1, firstly, magnesium powder, manganese powder, zinc powder, carbon nano tube powder, stearic acid and cerium oxide powder are evenly added into a ball mill to be subjected to ball milling treatment, and inert gas is introduced for protection in the grinding process; s2, mixed powder obtained after ball milling treatment in S1 is put into ultrasonic mixing equipment to be mixed; and S3, the mixed metal powder is put into a mold, and pressing forming is carried out. In the process of preparing the magnesium-based material, a passivation film can be formed on the magnesium surface, electrochemical corrosion is inhibited, magnesium alloy grains are refined, and the mechanical property is improved by adding cerium oxide, cerium oxide powder, aluminum triphosphate powder and epoxy resin are prepared into mixed slurry, and the mixed slurry is sprayed on the surface of the flaky magnesium-based material. The corrosion resistance of the flaky magnesium-based material can be improved, and the service life is prolonged.

The invention discloses preparation and application of a lithium-aluminum-magnesium alloy material with low self-corrosion efficiency. The preparation method comprises the following steps: (1) mixing an aluminum ingot, a magnesium ingot, an Al-10Fe alloy ingot and an Al-20Li alloy ingot, and smelting at high temperature to obtain alloy liquid; (2) adding sulfur powder, and uniformly stirring to obtain a melt; and (3) after casting, quenching to obtain an Al-2Li-4Mg alloy material, wherein the lithium-aluminum-magnesium alloy material comprises the following components in percentage by mass: 92.89% of Al, 4.68% of Mg, 2.04% of Li, 0.38% of Fe and 0.01% of Si. And (4) carrying out microstructure characterization, hydrogen evolution and electrochemical testing and aluminum air battery testing, and evaluating the electrochemical performance of the Al-2Li-4Mg alloy material. The lithium-aluminum-magnesium alloy material serves as an anode, the self-corrosion rate is remarkably reduced, the anode efficiency is improved to 90% from 71%, and the discharge performance is optimized by adjusting the form and distribution of the second phase Al3Fe in the bulk phase.

The invention discloses a gradient degradation type personalized absorbable sternum fracture fixing plate and a preparation process, and belongs to the technical field of medical implant materials. Comprising an anatomical adaptive plate body and an integrated locking assembly, the plate body is of a partitioned structure of a middle supporting area and an edge buffering area, a gradient pore array penetrating through the thickness direction is formed in the surface of the plate body, and a hydroxyapatite-collagen composite coating is loaded on the inner wall of a pore; the plate body is made of a composite absorbable material through 3D printing forming and hot pressing post-treatment, and the composite absorbable material comprises, by weight, 60%-70% of polylactic acid-glycolic acid copolymer (PLGA, LA / GA = 75 / 25), 15%-20% of silanized magnesium alloy microwires, 5%-10% of hydroxyapatite nano-particles and 5%-10% of polycaprolactone (PCL). Space-time matching of the degradation rate and the bone healing process is achieved through the partition gradient structure, the magnesium alloy microwires enhance the mechanical property and release active ions to promote osteogenesis, and the method has the advantages of personalized adaptation, gradient degradation, bone regeneration promotion and the like.

The invention provides a fully-synthetic magnesium alloy cutting fluid which comprises the following components in percentage by weight: 12-18% of a lubricant, 4-6% of an antirust agent, 2-5% of a corrosion inhibitor, 1-3% of a surfactant, 0.6-1.0% of a pH regulator, 0.4-0.6% of a defoaming agent, 0.3-0.5% of an antibacterial agent and the balance of deionized water. The corrosion inhibitor is composed of zinc acetate, praseodymium nitrate and phytic acid according to the mass ratio of (1.0-2.0): (1.2-1.8): (0.6-1.2). The invention further provides a preparation method of the total synthesis magnesium alloy cutting fluid. The fully-synthetic magnesium alloy cutting fluid prepared by the invention has excellent performance in the aspects of defoaming property, surface tension, corrosion resistance, anti-rust property, lubricity and the like, and provides long-acting and lasting protection for magnesium alloy processing.

Composition, characterized in that: —it comprises, in a solution of demineralized water: between 10 and 80, preferably between 15 and 20, more preferably 17, g / l of a composition of phosphoric acid H3PO4, and between 2 and 15, preferably between 4 and 8, more preferably 6, g / l of a composition of potassium permanganate KMnO4, —the weight ratio H3PO4 / KMnO4 is between 1.5 and 10, preferably between 1.8 and 5, mote preferably equal to 2.8, —said composition has a pH between 2.4 and 3, preferably 2.5.