1245 results about "Anodic oxidation" patented technology

The invention relates to the technical field of aircraft part processing, testing or inspection and the like, and provides an aircraft aluminum alloy plate aging evaluation method based on an equivalent circuit model, and the method comprises the following steps: collecting electrochemical impedance spectrums of samples with different exposure age limits, and extracting electrochemical impedance spectrum characteristics of the samples; establishing an equivalent circuit model comprising solution resistance, coating resistance, coating capacitance, Warburg impedance, anodic oxide film charge transfer resistance, interface capacitance, aluminum alloy matrix charge transfer resistance, interface electric double-layer capacitance, inductance and corresponding resistance of the inductance based on the characteristics, wherein the equivalent circuit model comprises the solution resistance, the coating resistance, the coating capacitance, the Warburg impedance, the anodic oxide film charge transfer resistance, the interface capacitance, the aluminum alloy matrix charge transfer resistance and the interface electric double-layer capacitance; and analyzing a resistance curve and a capacitance curve obtained by fitting the model to complete the evaluation of the corrosion and aging degree. According to the method, systematicness and accuracy of aging evaluation are improved, an electrochemical mechanism in the corrosion process can be disclosed, time correlation modeling of the aging process can be achieved, and the method is suitable for long-term service performance monitoring and service life prediction of the aviation aluminum alloy structure.

The invention belongs to the technical field of plasmas, and provides a remote plasma generator, which comprises an ionization cavity, an ignition assembly, a magnetic core assembly and a heat dissipation assembly, and is characterized in that an air channel is formed in the ionization cavity; the ignition assembly is used for conducting excitation ignition on gas in the gas channel to form plasma. The ignition assembly comprises a dielectric sheet, a sealing structure and an ignition structure, and the dielectric sheet is attached to the ionization cavity; the sealing structure is arranged on the outer side of the dielectric sheet; the ignition structure is used for performing excitation ignition on gas; an anodic oxidation coating film is formed on the inner wall of the ionization cavity; an anodic oxidation coating film is formed on the surface of the dielectric sheet through an anodic oxidation process. The anodic oxidation coating film is formed on the surface of the dielectric sheet, the dielectric sheet serves as a dielectric material, meanwhile, the anodic oxidation coating film on the surface is tightly attached to the anodic oxidation coating film in the ionization cavity, the contact surface stress is increased, the dielectric sheet is prevented from cracking, gas corrosion caused by plasma bombardment is effectively reduced, and the service life is prolonged.

The invention discloses an environment-friendly electrolyte for anodic oxidation of titanium and titanium alloy workpieces and an electrolytic coloring method. The electrolyte comprises 8-12 parts of lactic acid, 5-10 parts of sodium tartrate, 2-5 parts of sodium bicarbonate and the balance of deionized water. The electrolytic coloring method comprises the steps of pretreatment, anodic oxidation coloring and aftertreatment. The pretreatment comprises alkali washing oil removal, water washing and laser treatment; and an electrolyte mixed by 8-12 parts of lactic acid, 5-10 parts of sodium tartrate, 2-5 parts of sodium bicarbonate and the balance of deionized water is used for anodic oxidation coloring. The post-treatment comprises sealing treatment and drying. According to the technical scheme, the technical problems that the anodic oxidation coloring technology is completely free of fluorine, low in toxicity and safe to operate, and the oxidation waste liquid is free of pollution and easy to treat can be solved, existing pretreatment steps can be simplified, and meanwhile uniform coloring is achieved.

The invention discloses a carbon-doped titanium dioxide nanotube-molybdenum disulfide energy-storage antibacterial material and a preparation method thereof. The preparation method comprises the following steps: carrying out primary anodic oxidation on a clean titanium foil in a mixed electrolyte of ethylene glycol, water and ammonium fluoride; after ultrasonic treatment is carried out in a hydrochloric acid solution for set time, secondary anodic oxidation is carried out, and the mixed electrolyte of the secondary anodic oxidation is the same as that of the primary anodic oxidation; annealing the titanium foil subjected to anodic oxidation twice in an argon atmosphere, putting an annealed sample into a mixed solution of sodium molybdate, a sulfur source and glucose, and carrying out hydrothermal treatment; and the titanium foil subjected to hydro-thermal treatment is cleaned and dried, and the carbon-doped titanium dioxide titanium foil with the surface covered with molybdenum disulfide is obtained. The MoS2-coated carbon-doped titanium dioxide nanotube (TNT-C-atMoS2) with high biocompatibility developed by the invention has a synergistic effect of charge antibiosis and chemical sterilization, so that the problem of intractable biological fouling of a titanium-based metal material in ocean engineering equipment is effectively solved.

The invention discloses a process for improving anodic oxidation consistency of an anode foil for an aluminum electrolytic capacitor, and relates to the technical field of capacitor manufacturing, and the process comprises the steps of multi-stage washing, etching, feeding, multi-stage formation, intermediate treatment, first post-treatment, roasting, second post-treatment, stability treatment, drying, rolling, inspection and packaging. Wherein the multi-stage formation adopts three-stage oxidation of low-temperature and low-current, medium-temperature and medium-current and low-temperature and high-current, so that an oxidation film forms a base layer, a growth layer and a high-density protection layer which are uniformly overlapped layer by layer, and the consistency and compactness of the oxidation film are synergistically improved through dynamic water washing, air drying and temperature field and fluid field regulation and control technologies; the oxide film is repaired through first post-treatment, the pore size of the oxide film is reduced, and the compactness of the oxide film is improved; and high-temperature roasting is combined, and a second post-treatment step is carried out, so that the oxidation film forms an aluminum oxide crystal structure which is stable, high in hardness and compact in structure, and the water resistance and reliability of the finished anode foil are enhanced.

A method of manufacturing a structure having multi metal layers includes: depositing a top metal layer on a bottom metal layer; forming a patterned photoresist on the top metal layer; etching the top and bottom metal layers through first hollow portions of the patterned photoresist to respectively form a top metal pattern and a bottom metal pattern; forming a second hollow portion in the patterned photoresist to expose a portion of the top metal pattern; etching the top metal pattern through the second hollow portion until a top surface portion of the bottom metal pattern is exposed by the etched top metal pattern, in which an etch selectivity of the top and bottom metal layers in the etching the top metal pattern is greater than 1.0; and anodizing the top surface portion to form an anodized segment of the bottom metal layer.

The invention belongs to the technical field of metal surface treatment, and relates to a preparation method of a metal surface lattice passivation corrosion-resistant film, which comprises the following steps of: polishing and cleaning a metal surface, constructing a three-electrode system, and applying cathode voltage to the metal to carry out surface modification treatment so as to realize metal surface lattice reconstruction, thereby obtaining the metal surface lattice passivation corrosion-resistant film. A compact adsorption layer of corrosion inhibition molecules is formed; the three-electrode system comprises metal as a working electrode, a platinum sheet as an auxiliary electrode and silver / silver chloride or saturated calomel as a reference electrode. According to the method, metal surface lattice reconstruction is achieved through cathode voltage treatment, the technical thought of traditional anodic oxidation is subverted, the passive film forms a regular lattice structure, defects in the film are greatly reduced, permeation of a corrosion medium is effectively blocked, and the corrosion resistance of metal is remarkably improved.

The invention discloses a high-salt-corrosion-resistant concrete pouring material and a preparation method thereof, and relates to the technical field of high-salt-corrosion-resistant concrete, and the high-salt-corrosion-resistant concrete pouring material comprises the following components in parts by weight: 5-10 parts of modified charcoal, 1.5-3 parts of a corrosion inhibitor, 320-360 parts of cement, 650-700 parts of river sand, 20-30 parts of silica fume, 0.3-0.6 part of super absorbent resin, and 0.2-0.8 part of a water reducing agent. According to the high-salt-corrosion-resistant concrete pouring material and the preparation method thereof, a protective film is formed on the surface of a reinforcing steel bar through the corrosion inhibitor, the anodic oxidation reaction is inhibited, the reinforcing steel bar is prevented from being corroded, eugenol releases corrosion inhibition molecules, a hydrophobic protective film is formed on the surface of the reinforcing steel bar, and electrochemical corrosion is inhibited; meanwhile, through the synergistic effect of a physical barrier and chemical passivation, the calcium-aluminum salt-eugenol composite corrosion inhibitor not only can block a corrosion path through physical film formation, but also can inhibit electrochemical reaction through chemical adsorption, so that the corrosion inhibition efficiency is improved.

The invention relates to the field of material science and mechanical engineering, in particular to a high-strength aluminum-magnesium-silicon material bolt for a new energy automobile and a preparation method of the high-strength aluminum-magnesium-silicon material bolt. The bolt is made of an aluminum-magnesium-silicon alloy, and the alloy contains magnesium, silicon, manganese, iron, chromium, titanium, scandium, rare earth elements and the balance of aluminum. By optimizing the proportion of rare earth elements (yttrium, lanthanum and cerium) and scandium, grains are effectively refined, the tensile strength, the yield strength and the ductility are improved, and meanwhile the corrosion resistance and the fatigue resistance are enhanced. The preparation method comprises the steps that vacuum melting is combined with the ultrasonic-assisted technology, alloy elements are evenly distributed, and then the material structure is optimized through solution treatment at the temperature of 540 DEG C for 1.5 h and aging treatment at the temperature of 160 DEG C for 8 h. And the surface of the bolt is subjected to anodic oxidation and coated with a composite coating containing silicon dioxide nanoparticles, so that the wear resistance and the corrosion resistance are improved. Through verification, the bolt has the excellent performance that the tensile strength is larger than or equal to 490 MPa, the yield strength is larger than or equal to 440 MPa, the ductility is larger than or equal to 8.5%, and the salt spray test time is larger than or equal to 1500 hours, and the fastening requirement of the new energy automobile under the complex working condition is met.

The invention relates to the technical field of aluminum alloy materials, and provides a high-thermal-conductivity 6xxx aluminum alloy, a preparation method thereof and an electronic product structural part. Wherein the 6xxx aluminum alloy comprises the following components in percentage by mass: 0.3 to 0.5 percent of Mg, 0.2 to 0.35 percent of Si, 0.08 to 0.12 percent of Ce, less than or equal to 0.10 percent of Cu, less than or equal to 0.15 percent of Fe, less than or equal to 0.05 percent of Mn, less than or equal to 0.10 percent of Zn, less than or equal to 0.05 percent of Ti, less than or equal to 0.15 percent of total impurities and the balance of Al; and Mg / Si is in the range of 1.3 to 1.5. According to the 6xxx aluminum alloy and the preparation method thereof, the content and the mass ratio of Si and Mn are accurately regulated and controlled, meanwhile, a trace Ce element is added, the thermal conductivity and the anodic oxidation performance of the 6xxx aluminum alloy are improved, solid solution and aging processes are further matched, the beta ''phase and the grain size are controlled, and the alloy has the excellent anodic oxidation performance while having the high thermal conductivity.

The invention relates to the technical field of aluminum plate preparation, in particular to a preparation process of an aluminum plate for an energy-saving and environment-friendly curtain wall material, which comprises the following steps: smelting an aluminum ingot into molten aluminum by using a smelting furnace, adding a refining agent into the molten aluminum, stirring, conveying the refined molten aluminum to a casting machine, and cooling to output a cast ingot; carrying out annealing treatment on the cast ingot, carrying out hot rolling on the annealed cast ingot by using a hot rolling mill so as to output an aluminum plate blank, carrying out surface treatment on the aluminum plate blank by using an anodic oxidation method, and coating the aluminum plate blank with an energy-saving and environment-friendly curtain wall material so as to output an aluminum plate; determining the preparation stability of the aluminum plate based on the temperature rise rate in the smelting furnace; if the preparation stability does not meet the requirement, the rotating speed of a stirrer in the smelting furnace is adjusted; and if the quality characteristics do not meet the requirements, the rolling reduction of the hot rolling mill is adjusted. The preparation stability of the aluminum plate is improved.

The invention relates to the technical field of aluminum alloy materials, in particular to a high-strength and high-toughness Al-V-Ti-Mn-Mg series aluminum alloy and a preparation method thereof.The high-strength and high-toughness Al-V-Ti-Mn-Mg series aluminum alloy mainly comprises, by mass, 0.05%-0.5% of V, 0.05%-0.5% of Ti, 0.4%-1.2% of Mn, 0.3%-1.2% of Mg, 0.1%-0.3% of Cr, smaller than or equal to 0.15% of inevitable impurity elements, the balance Al and inevitable impurities, and the balance Al and inevitable impurities. And at least one of Sc, Zr and Er, less than or equal to 0.2% of Sc, less than or equal to 0.2% of Zr, less than or equal to 0.2% of Er, and the balance of Al. The high-strength and high-toughness Al-V-Ti-Mn-Mg series aluminum alloy provided by the invention is less in coarse second-phase grains and excellent in anodic oxidation effect, and has excellent corrosion resistance and a small-color-difference coloring effect after anodic oxidation.

A method of manufacturing a structure having anodized parts includes: forming a bottom metal pattern with a dielectric layer thereon on a substrate, in which the dielectric layer has an opening exposing the bottom metal pattern; forming a semiconductor layer to cover the dielectric layer; forming a first metal layer on the semiconductor layer; forming a second metal layer on the first metal layer; forming a mask layer on the second metal layer to expose a portion of a top surface of the second metal layer; etching the second metal layer through the mask layer until a top surface of the first metal layer is exposed, in which an etch selectivity of the second metal layer and the first metal layer is greater than 2.0; anodizing the first metal layer through the mask layer to form an anodized segment; and removing the mask layer.

The present invention relates to a method for simultaneously achieving a superhydrophobic and superoleophobic surface on 5,000 series aluminum alloy in an anodic oxidation process without a pre-patterning step, wherein the uniform anodic oxide film can be produced even without a pre-patterning step, thus making it possible to reduce manufacturing costs, the anodic oxide film can be imparted with superhydrophobicity and superoleophobicity according to a coating composition in which a cross-linked PDMS derivative represented by chemical formula 1 and an organic solvent are used in a specific mixing ratio, the coating composition has a low manufacturing cost and the coating film thickness can be adjusted to several to several tens of nm, thus enabling application to the coating of a microstructured oxide film, and the method can be useful for creating a machine learning database for developing 5,000 series aluminum alloy surface treatment technology.

The invention relates to the technical field of processing, testing or inspection of aircraft parts, and provides a method for detecting surface defects of an aluminum alloy plate with an epoxy coating. The method comprises the following steps: applying an epoxy coating doped with a zinc yellow pigment to an anodic oxide film to construct a coating test piece with a color difference indication function, and placing the coating test piece in a coastal atmospheric environment for exposure sampling. In the detection process, the gloss loss rate, the chromatic aberration, the contact angle, the defect area proportion and the corrosion current density are collected, a dynamic correction coefficient is calculated according to the hydrolysis degree of the zinc yellow pigment, all parameter thresholds are adjusted in a self-adaptive mode, and a threshold set is constructed. And in combination with scanning electron microscope image segmentation and Tafel extrapolation analysis, multi-source indexes are fused to judge whether the coating is invalid. According to the method, the hydrolysis behavior of the zinc yellow pigment can be tracked in real time, the judgment standards of optical, morphology and electrochemical indexes are automatically corrected, and the accuracy and reliability of failure detection of the epoxy coating aluminum alloy plate under the coastal service condition are improved.

The invention relates to a metal surface treatment production line with a double-position clamping structure, and relates to the technical field of anodic oxidation metal part production lines, the metal surface treatment production line comprises a production pool and a double-position conveying clamping mechanism, a fixed base is installed below the production pool, and the double-position conveying clamping mechanism is installed above the production pool; the double-position conveying and clamping mechanism comprises supporting frames and a material receiving and conveying assembly, the material receiving and conveying assembly is installed at the centers of the two supporting frames through bolts, a first conveying assembly is arranged on the side edge of the material receiving and conveying assembly, and a second conveying assembly is arranged on the side, away from the material receiving and conveying assembly, of the first conveying assembly; a third conveying assembly is arranged on the side, away from the first conveying assembly, of the second conveying assembly. The device has the effects that the production efficiency is greatly improved, meanwhile, the quality and stability of product production are guaranteed, and the manpower demand is reduced.

The invention discloses a low-carbon high-strength die-casting anode aluminum alloy and a preparation method and application thereof, and relates to the field of die-casting aluminum alloys and products thereof. The die-casting anode aluminum alloy is composed of the following components in percentage by mass: 1.61-3.0% of Mn; 0.85 to 4.7 percent of Mg; 0.01 to 3.8 percent of Zn; si < = 0.45%; fe < = 0.55%; cu < = 0.8%; 0.0001% to 0.012% of C; 0.005% to 0.10% of M; 0.002 to 0.6 percent of Ti; 0.001% to 0.4% of B; m is at least one of Nb, Y, La, Er and Sm. The content of impurities is less than or equal to 0.2 wt%; ti, B, C and M are added in the form of an Al-Ti-B-C-M composite fine grain alterant. The die-casting aluminum alloy which is low in cost, uniform in anodic oxidation appearance, free of different colors, excellent in comprehensive performance and capable of forming and machining thin-wall part products can be obtained.

The invention belongs to the field of photovoltaic modules, and discloses a perovskite crystalline silicon laminated photovoltaic module and a preparation method thereof.The photovoltaic module comprises front plate glass, and a top cell perovskite layer, a first adhesive film layer, a bottom cell crystalline silicon cell layer, a second adhesive film layer and back plate glass are sequentially laid on one side of the front plate glass; the edges of the top cell perovskite layer, the first adhesive film layer, the bottom cell crystalline silicon cell layer and the second adhesive film layer are wrapped and sealed through a composite frame, the composite frame comprises a substrate with the wall thickness of 0.1-2mm, the surface of the substrate is provided with an anodic oxide layer with the thickness of 4-6mu m, and the surface of the anodic oxide layer is covered with a polyimide layer with the thickness of 30-1mm. The laminated photovoltaic module adopts the composite frame to replace the existing butyl rubber for sealing, so that the metalized edge sealing is perfectly fused into the low-temperature laminating process, the sealing performance is superior to that of the butyl rubber, and the service life of the laminated photovoltaic module is prolonged.

Methods of and apparatuses for the manufacture of biomimetic physical antimicrobial polymer foils are disclosed. An example method of manufacturing includes providing a substrate. The method additionally includes depositing an aluminum-containing layer on the substrate. The method yet further includes anodizing an exposed surface of the aluminum-containing layer in a first bath so as to form a plurality of pores in the exposed surface of the aluminum-containing layer. Moreover, the method includes immersing the exposed surface of the aluminum-containing layer in a second bath, further etching the plurality of pores in the exposed surface of the aluminum-containing layer. Methods also include formation of templated polypropylene and cellulose films.

The invention relates to a method for constructing a composite super-hydrophobic coating through double bonding. The preparation method comprises the following steps: taking a clean copper sheet which is not pretreated as a substrate, dipping the copper sheet in a suspension consisting of nanoparticles and sulfydryl-containing siloxane ethanol, taking out, washing, drying, dipping in a perfluoromercaptan ethanol solution, taking out, washing, and drying to obtain the copper-based super-hydrophobic surface coating. The coating prepared by the method has excellent super-hydrophobicity, icing resistance and stability. Different from an existing conventional preparation method, the method has the advantages that pretreatment operation such as abrasive paper polishing, strong acid etching or anodic oxidation does not need to be carried out on a copper sheet, and micro-nano roughening and low-surface-energy self-assembly can be completed on the copper surface only through two-step normal-temperature dipping. The method is simple in preparation process, mild in condition, free of expensive equipment, thin in coating thickness and small in influence on electric conduction and heat conduction of the copper substrate, intrinsic performance of copper can be reserved, the electric conduction / heat conduction characteristic of the copper substrate is considered, and the method has wide application value and prospects.

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 provides an anodic oxidation passivation method of a neodymium-iron-boron permanent magnet zinc coating, which comprises the following steps of: performing electrochemical anodic oxidation by taking a neodymium-iron-boron permanent magnet with a zinc coating on the surface as an anode, a Pt sheet as a cathode and a passivation solution as an electrolyte, forming a passivation layer on the surface of the neodymium-iron-boron permanent magnet with the zinc coating on the surface, and cleaning and drying to obtain the neodymium-iron-boron permanent magnet with the zinc coating on the surface. A chromium-free passivation film is formed on the neodymium-iron-boron permanent magnet zinc coating, and passivation of the neodymium-iron-boron permanent magnet zinc coating is completed; the passivation solution is prepared from 10 g / L to 20 g / L of molybdate, 10 g / L to 15 g / L of ammonium fluozirconate, 1 g / L to 10 g / L of etidronic acid, 1 g / L to 10 g / L of sodium dihydrogen phosphate, 1 g / L to 10 g / L of nitric acid, 1 g / L to 10 g / L of phosphoric acid and the balance distilled water. According to the method disclosed by the invention, a complete, uniform and compact passivation film is formed on the surface of the zinc coating after passivation, the corrosion potential is improved while the corrosion current is effectively reduced, and the time for generating a rust spot in a salt spray test exceeds 72 hours.

The application discloses a preparation method of notebook computer shell added with recycled aluminum anodized aluminum strip, and specifically comprises the following steps: raw materials such as recycled aluminum, aluminum ingot and intermediate alloy ingot are subjected to smelting, casting, hot rolling, cold rolling, intermediate annealing, roughening cold rolling and cleaning and straightening to obtain a notebook computer shell added with recycled aluminum 5000 series aluminum plate strip. The average grain size of the aluminum alloy strip is less than 10 microns, the grain aspect ratio is 0.9-1.1, the maximum size of intermetallic compounds is less than 5 microns, the compound proportion difference in unit area is less than 1%, the sand blasting sand type on the surface of the aluminum material is 120-150# iron sand, the roughness Ra after sand blasting is 1.8+ / -0.3 microns, and the anodized surface is fine and free of material lines.

The invention belongs to the technical field of metal materials, and particularly relates to a high-strength decorative aluminum product metal material and a preparation method thereof. The preparation method of the high-strength decorative aluminum product metal material comprises the following steps: (1) adding carbon nano onions, sulfuric acid and oxalic acid into water to prepare a mixed acid solution, immersing an aluminum matrix into the mixed acid solution for anodic oxidation, and then cleaning and drying to prepare a pretreated aluminum matrix; and (2) polyformaldehyde fibers are added into the dispersion liquid, a heating reaction is conducted, a mixed solution is obtained, the surface of a pretreated aluminum matrix is coated with the mixed solution, then heat treatment is conducted, after aging is conducted at the room temperature, cleaning and drying are conducted, and the high-strength decorative aluminum product metal material is obtained. The preparation process is simple, the product performance is stable, and the product has the properties of high strength, high hardness, wear resistance, super-hydrophobicity, self-cleaning and the like.

The invention is applicable to the technical field of process optimization, and particularly relates to a method for generating an anodic oxidation current density adjustment scheme based on mutual information entropy, which comprises the following steps of: obtaining process parameters in real time and carrying out adaptive filtering processing to ensure the accuracy and effectiveness of key characteristic parameter extraction and provide a high-quality data basis for optimization. Determining key feature parameters according to the process parameters and a mutual information entropy value of a preset optimization target; screening current density data to be optimized according to the key parameter influence weight; a to-be-selected current density curve matched with a preset oxidation quality standard is extracted from the to-be-optimized data, the deviation between a current value and the curve is calculated to serve as a to-be-selected optimization parameter, and an abstract standard is converted into a concrete basis. A self-adaptive adjustment scheme is generated in combination with to-be-selected parameters, process changes are dynamically adapted, fluctuation caused by static setting is avoided, high consistency of current density control precision and oxidation film quality stability is achieved, the optimization period is shortened, and production efficiency is improved.

The invention discloses a processing technology of a double-layer hard anodic oxide film on a metal surface, relates to the technical field of aluminum alloy anodic oxidation, and provides the processing technology of the double-layer hard anodic oxide film on the metal surface in order to improve the surface hardness and high temperature resistance of aluminum alloy. The anodic oxide layers with different pores are prepared through different electrolyte components, the primary anodic oxide layer serves as a bottom layer, thermal stress between an aluminum alloy body and the oxide layers due to different thermal expansion coefficients is effectively reduced, expansion caused by thermal shock is relieved, the secondary anodic oxide layer on the surface layer has a small pore diameter, and the thermal shock resistance of the aluminum alloy body is improved. And the carbon fibers are subjected to modification treatment, so that the aluminum alloy material has relatively high hardness and a better corrosion-resistant effect, and the applicability of the aluminum alloy material to various environments is effectively improved.

A method of forming an electrode with multi-dielectric layers includes: forming a metal pattern on a substrate, in which the metal pattern includes a first metal film on the substrate and a second metal film on a top surface of the first metal film, and the first and second metal films have different metal compositions; and anodizing the metal pattern in a liquid electrolyte to form a covering anodized portion which covers an unanodized portion, in which the covering anodized portion includes a sidewall oxide dielectric structure and a top oxide dielectric structure, the sidewall oxide dielectric structure is in contact with a side surface of the unanodized portion, the top oxide dielectric structure is in contact with top surfaces of the unanodized portion and the sidewall oxide dielectric structure, and the sidewall and top oxide dielectric structures have different effective permittivities.

The invention provides a 5G50 aluminum alloy plate strip for anodic oxidation and a preparation method of the 5G50 aluminum alloy plate strip. The 5G50 aluminum alloy plate strip for anodic oxidation comprises the following elements in percentage by mass: 0.01%-0.10% of Si element, 0.04%-0.15% of Fe element, 3.0%-4.0% of Mg element, 0.2%-1.2% of Mn element, less than or equal to 0.02% of inevitable impurity element in total content, less than 0.05 wt% of single impurity element and the balance of Al. Wherein after the aluminum alloy plate strip is subjected to anodic oxidation treatment, the surface of the aluminum material has no heterochromatic stripe defect, and the chromatic aberration E is less than 0.15. The 5G50 aluminum alloy plate strip for anodic oxidation can give consideration to both high surface quality and excellent mechanical performance, is widely applied to 3C consumer electronics, and can achieve the practical effects of falling resistance, light weight and attractive appearance of the product.

The invention belongs to the technical field of catalytic materials, and particularly relates to a nickel-iron-cobalt entropy alloy nanowire three-dimensional interconnection grid film and a preparation method and application thereof. The preparation method comprises the following steps: taking an aluminum sheet containing copper impurities as a substrate, and preparing a three-dimensional ordered porous aluminum oxide template through anodic oxidation; then, the nickel-iron-cobalt entropy alloy nanowire is prepared in a pore channel limited range through direct current co-electrodeposition; the nickel-iron-cobalt entropy alloy nanowire three-dimensional interconnection grid film is obtained after the aluminum substrate and the 3D-AAO template are removed, the material is based on the mixed entropy effect and structural integrated design and can be directly used as a self-supporting electrode for efficiently and stably electrolyzing water for oxygen evolution, the three-dimensional grid structure and the self-supporting characteristic of the material promote electrolyte transmission and gas product desorption, and the oxygen evolution efficiency is improved. The mass transfer efficiency is improved, the use of a traditional binder is avoided, and the electrode stability is enhanced; the problems that an existing medium-entropy alloy catalyst is high in synthesis energy consumption, the catalytic activity is poor under the industrial-grade large-current working condition, active substances fall off in the reaction and the like are solved.

The invention relates to the technical field of metal structure forming, in particular to a metal structure surface treatment method which comprises the steps that anodic oxidation treatment is conducted on a metal structure obtained after primary machining, a first oxide layer with the first thickness is formed on the metal structure, and the first oxide layer comprises a porous structure; sealing the porous structure of the first oxide layer; anodic oxidation treatment is carried out on the metal structure after secondary processing, a second oxide layer with a second thickness is formed on the metal structure, and the second oxide layer comprises a porous structure; the metal structure subjected to anodic oxidation is subjected to coloring treatment; sealing the porous structure of the second oxide layer; and obtaining the metal structure subjected to surface treatment. According to the method, the treatment time is effectively optimized, the total process time can be shortened by more than 50 minutes, unified coloring treatment is carried out after two times of processing, the color consistency and the gloss uniformity can be improved, the formula components of the hole sealing agent and the release agent are optimized, and the corrosion resistance and the surface quality of the formed surface can be effectively improved.