896 results about "Alloy coating" patented technology

The invention relates to the technical field of defect detection, and discloses a Babbitt metal coating surfacing thin-wall layer defect detection method and device. The method comprises the following steps: carrying out multi-source detection data acquisition, multi-domain transformation and filtering enhancement on a babbitt metal coating, and obtaining preprocessed multi-source initial coating detection data to carry out interface-tissue-defect mapping, so as to obtain unified representation of an internal tissue structure of the coating; performing progressive fusion of a coating depth structure and extraction of coating defect morphology and structural features on the unified feature representation to obtain preliminary defect semantic features, and performing feature weighting calculation of defect morphology on the preliminary defect semantic features to obtain initial defect semantic features; and carrying out bearing strength and shear strength calculation and fatigue life prediction on the initial defect semantic features to obtain a final detection result. According to the method, the defects of the thin-wall layer coated and surfaced by the babbitt metal can be efficiently and accurately detected.

The invention relates to the technical field of alloy coatings, and discloses a laser cladding high-entropy alloy coating and a preparation method thereof.The laser cladding high-entropy alloy coating is prepared from, by mass, 25%-45% of Fe, 15%-25% of Cr, 10%-20% of Ni, 5%-15% of Mn, 3%-10% of Al, 0%-5% of Ti, 1%-5% of a nanometer reinforcing phase and 0.1%-0.5% of a flow promoter. Lorentz force generated by an alternating electromagnetic field drives melt convection, so that the diffusion coefficient of segregation-prone elements such as Cr and Ni is increased, the ultrasonic cavitation effect is matched to crush dendritic crystals and promote dispersion of nanoparticles, the segregation index of the elements is reduced, a uniform nanocrystalline-amorphous composite structure is formed through the synergistic effect, and uniform distribution of elements in a molten pool is achieved.

The invention discloses a gradually-changed Si-Al alloy coating diamond / aluminum-based composite material and a preparation method and application thereof, and the gradually-changed Si-Al alloy coating diamond / aluminum-based composite material is composed of an aluminum matrix and modified diamond evenly dispersed in the aluminum matrix. The modified diamond comprises diamond particles and a gradually-changed Si-Al alloy coating wrapping the surfaces of the diamond particles, in the gradually-changed Si-Al alloy coating, the mass fraction of Si is linearly decreased from 100% to 0% from inside to outside, and the mass fraction of Al is linearly increased from 0% to 100% from 0%. According to the method, the Si-Al alloy coating with gradually-changed and controllable components is constructed on the surface of the diamond, so that a SiC transition layer with strong binding force can be formed with the diamond, the gradient gradient coating is formed from inside to outside, internal stress can be released, good metallurgical bonding with an aluminum matrix can be achieved, formation of an Al4C3 phase is inhibited, and therefore the performance of the composite material is remarkably improved.

The invention relates to a preparation method of a seawater wear and corrosion resistant high-entropy alloy coating, and belongs to the technical field of coating preparation and treatment. The preparation method comprises the steps that matching calculation is conducted according to the chemical formula FeCrCoMnSix of the high-entropy alloy, Fe, Cr, Co, Si and Mn-Fe alloy powder are weighed, and x is equal to 0.1-1; the weighed powder is mixed and then subjected to ball milling, and a mixture is obtained; mixing the mixture with an adhesive, coating the mixture on a substrate to form a plurality of prefabricated layers, distributing the prefabricated layers on the substrate in parallel, and then drying the coated substrate; under the protection atmosphere of inert gas, the dried base body coated with the prefabricated layer is subjected to multi-channel laser cladding; and then annealing treatment is conducted, and the high-entropy alloy coating is obtained. According to the method, the seawater corrosion resistance and wear resistance of the high-entropy alloy coating are improved by adjusting the content of the Si element, utilizing the laser cladding technology and further performing annealing treatment.

The invention discloses a double-gradient high-temperature-resistant high-entropy alloy wear-resistant layer and an ultrasonic-assisted laser cladding preparation method thereof, and belongs to the technical field of metal material coatings and surface modification. A proper amount of refractory element W with anti-oxidation and solid solution strengthening effects is introduced into a CoCrFeNi high-entropy alloy coating, an ultrasonic-assisted laser cladding process is adopted, the wear-resistant layer with the grain size and the precipitated phase volume fraction in a gradient structure from exterior to interior is prepared, local stress concentration caused by W aggregation in the laser cladding process is improved, and the wear-resistant performance of the CoCrFeNi high-entropy alloy coating is improved. And the metallurgical bonding strength of the cladding layer and the matrix is improved, and the high-temperature friction and wear resistance of the cladding layer is enhanced. The cladding layer is fine and compact in structure, in gradient distribution, good in mechanical property and excellent in high-temperature wear resistance. The method is easy to operate and low in cost, and an effective method is provided for improving highly coordinated regulation of process-structure-performance and preparing the novel high-temperature-resistant high-entropy alloy wear-resistant layer.

The present invention discloses a high-temperature oxidation resistant coating based on self-diffusion of a titanium alloy matrix and a preparation method thereof, belonging to the field of metal or alloy surface treatment, wherein the high entropy alloy coating is AlCoCrFeNiTi, and the high entropy alloy coating has a cubic structure and exists in the form of a single solid solution. The present invention adopts double glow plasma alloying technology, uses an AlCoCrFeNi target as a sputtering source, bombards the target with high-purity argon gas, diffuses TiAl alloy matrix elements outward, and prepares an AlCoCrFeNiTi high entropy alloy coating resistant to high-temperature oxidation on its surface. The high entropy alloy coating prepared by the present invention is resistant to oxidation, has high bonding strength, and has good comprehensive mechanical properties.

The invention relates to the field of bimetal composite materials, in particular to a method for researching the influence of an intermediate layer on bimetal interface assembly and performance, which comprises the following steps: electrochemically depositing a FeCoNiCr-M high-entropy alloy coating; a micro-textured high-entropy alloy coating is constructed in a laser controllable manner; according to Al / HEA / Fe composite material liquid-solid forming process optimization and structure property characterization, the Al / HEA / Fe composite material liquid-solid forming process optimization and structure property characterization method has the following beneficial effects that according to the requirement for Al / Fe bimetal high interface bonding strength, the microtextured high-entropy alloy coating is prepared through the electrochemical and femtosecond laser composite technology, the microtextured high-entropy alloy coating serves as a middle layer between a solid steel matrix and a liquid aluminum alloy melt, and the high-strength Al / HEA / Fe composite material is obtained; the Al / HEA / Fe composite material is obtained through a liquid-solid forming technology, and the Al / HEA / Fe composite material is obtained through high-entropy alloy component / content optimization, coating surface structure design, technological parameter regulation and control and the like on the basis of thermal and dynamic calculation and experimental data analysis. And research on the aspects of a high-entropy alloy coating solid solution phase forming mechanism, a composite material interface structure evolution rule, an interface strengthening mechanism and the like is carried out.

The invention belongs to the technical field of protective coatings, and particularly relates to a titanium alloy surface anti-oxidation coating and a preparation method. The diffusion aluminide coating with the aluminum content gradually reduced from outside to inside is prepared on the surface of the titanium alloy, and the coating is free of penetrating cracks and can contain elements such as Si. Firstly, an aluminum or aluminum alloy coating is pre-deposited on the surface of the titanium alloy, and then the diffusion aluminide coating is prepared through thermal diffusion treatment under vacuum. By adopting the method, not only is the prepared coating free of penetrating cracks, but also the formation of the cracks is inhibited in the thermal cycle process, and the high-temperature oxidation resistance of the coating is excellent.

The invention provides a flexible alloy siloxane composite weather-resistant anticorrosive coating for a steel structure and a preparation method of the flexible alloy siloxane composite weather-resistant anticorrosive coating, and belongs to the technical field of anticorrosive coatings. The flexible alloy coating in the coating uses composite alloy to replace zinc powder, so that the anti-corrosion mechanism is enriched, the anti-corrosion performance of the coating is enhanced, and salt inorganic matters in the alloy form a dual-protection mechanism; according to the alloy closed coating, the toughness of the coating is improved while the shielding layer is formed by using a flaky material; the service life of the coating in a severe environment is prolonged by using chemical-corrosion-resistant modified silane resin, and meanwhile, the stripping phenomenon can be effectively reduced due to the adhesive force of the modified silane resin; a hydrophobic protection layer can be formed on the surface of the weather-resistant filler through fluoridation modification, the corrosion resistance of the weather-resistant filler is enhanced, damage of ultraviolet rays to the filler and a base material can be effectively prevented by coating the weather-resistant filler with the ultraviolet-resistant resin, and the service life of the filler and the service life of the coating are prolonged.

The present invention provides a method for preparing tin or tin alloy-coated copper powder and a low-temperature conductive paste, wherein the method comprises the following steps: S10, pretreating the surface of the copper powder to remove oxides and impurities on the copper powder surface; S20, placing the pretreated copper powder in an electroplating solution containing an organic phosphine compound additive; electroplating the copper powder using tin metal or tin alloy as an anode and copper powder as a cathode, wherein the copper powder is dispersed during the electroplating process; S30, after the electroplating is completed, filtering, washing, and drying to obtain the tin or tin alloy-coated copper powder. The addition of the organic phosphine compound in the present invention greatly improves the compactness of the tin or tin alloy coating formed on the surface of the copper powder, thereby making the prepared tin-coated copper powder or tin alloy-coated copper powder have the advantage of better oxidation resistance.

The present invention provides a high-entropy alloy coating material, comprising: FeCoCrNiAl high-entropy alloy powder and yttrium powder; the weight of the yttrium powder is 0.5-1.0 wt.% of the weight of the FeCoCrNiAl high-entropy alloy powder. A method for preparing a wear-resistant coating by plasma cladding is also provided. By using the plasma cladding process with the high-entropy alloy-based coating material, a FeCoCrNiAl coating with a single BCC structure can be directly prepared on the surface of a substrate without further heat treatment, and a high-performance wear-resistant coating can be obtained while effectively reducing costs.

The invention discloses a wide-temperature-range wear-resistant high-entropy alloy coating as well as a preparation method and application thereof, and belongs to the technical field of wear-resistant materials. The wide-temperature-range wear-resistant high-entropy alloy coating comprises a high-entropy alloy bottom layer and a high-entropy alloy oxide surface layer, the high-entropy alloy in the high-entropy alloy bottom layer comprises at least four elements of Ti, Nb, Cr, Mo, V and Ta; the high-entropy alloy oxide surface layer is formed after high-entropy alloy in the surface area in the high-entropy alloy bottom layer is subjected to in-situ oxidation. The wide-temperature-range wear-resistant high-entropy alloy coating has high hardness and wide-temperature-range mechanical property stability, has excellent wear resistance and corrosion resistance in the range of room temperature to 700 DEG C, and can greatly improve the use performance and prolong the service life of a high-temperature moving part.

The invention relates to the field of coatings, and discloses a wear-resistant and corrosion-resistant high-entropy alloy composite coating and a preparation method thereof.The wear-resistant and corrosion-resistant high-entropy alloy composite coating is prepared by depositing functional high-entropy alloy composite powder on the surface of a base body in a laser cladding mode, the functional high-entropy alloy composite powder comprises high-entropy alloy powder, a modified additive and composite ceramic powder, the modified additive is prepared by using urea and titanium tetrachloride as raw materials, growing nano titanium nitride particles on the surface of a silicon carbide nanowire in situ to prepare a nano titanium nitride / silicon carbide nanowire composite material, and then coating a layer of nano titanium dioxide particles on the surface of the nano titanium nitride / silicon carbide nanowire composite material by using tetrabutyl titanate; and the composite ceramic powder is prepared by compounding zirconium carbide, niobium carbide, hafnium carbide and tantalum disilicide. The hardness, wear resistance and corrosion resistance of the high-entropy alloy coating are enhanced by adding the modified additive and the composite ceramic powder.

The invention relates to the technical field of metal material surface treatment, in particular to a preparation method of a hot galvanizing layer of a hot-rolled high-strength steel plate with high corrosion resistance. Firstly, a hot-rolled steel plate is formed after smelting, continuous casting and hot rolling; secondly, the corrosion-resistant hot-rolled high-strength steel plate is subjected to oil removal through alcohol and then put into a heat treatment furnace into which shielding gas can be introduced for hydrogen reduction; then, the corrosion-resistant hot-rolled high-strength steel plate subjected to hydrogen reduction is placed in a plating assistant agent to be soaked; then, the corrosion-resistant hot-rolled high-strength steel plate soaked with the plating assistant is soaked in a Zn-Al-Mg alloy plating solution for hot dipping; and finally, the hot-rolled high-strength steel galvanized plate obtained after hot dipping is taken out of the plating solution in the high-purity Ar protective atmosphere, and the hot-rolled high-strength steel galvanized plate is placed in a protective cover full of the high-purity Ar protective atmosphere to be naturally cooled to the room temperature. The corrosion resistance of the Zn-Al-Mg alloy coating on the surface of the hot-rolled steel plate can be effectively improved, and meanwhile, compared with other hot galvanizing technologies, the corrosion resistance is higher.

The invention belongs to the technical field of physical vapor deposition forming precision, and discloses a method for predicting geometric and performance characteristics of a magnetron sputtering aluminum-tin coating, which comprises the following steps of: investigating the influence of technological parameters such as sputtering power, substrate bias voltage, sputtering air pressure and target-substrate distance on the performance of an aluminum-tin alloy coating on the basis of an independent variable control strategy system; the shape change rule of the aluminum-tin coating under the action of different process parameters is disclosed; based on a response curved surface experiment design theory and a multi-factor optimization theory, a coating process-performance mapping mechanism under multiple process parameters is explored; establishing a characteristic database containing process parameters and coating geometry and performance characteristics; and optimizing coating process parameters based on the coating characteristic target value, clarifying a coating shape quality change rule under the process coupling effect, and optimizing the process parameters. According to the method, the mapping model of the process parameters and the geometric characteristics of the coating can be quickly and accurately established, the process cost is low, the efficiency is high, and the precision is controllable.

A hot-stamped coated steel part includes a steel substrate and an aluminum alloy coating comprising, proceeding from steel substrate outwards, an interdiffusion layer and an outer layer. The total thickness of the coating ecoating and the thickness of the interdiffusion layer eIDL satisfy the following condition:40≤Ep⁢c≤8⁢0withEpc=(3⁢3.3-eIDL0.9+eIDL-ecoating)2-1⁢4⁢8⁢(eIDL-ecoating)-(3⁢3.3-eIDL0.9+eIDL-ecoating)The hot-stamped coated steel part comprises an undeformed portion having a thickness ePflatfrom 0.6 mm to 3.5 mm, and at least one deformed portion. A lineic density of cracks dC in the coating in the undeformed portion is higher than or equal to a minimum lineic density of cracks dCmin(ePflat) defined as:dCmin(epflat)=1⁢5.5+9⁢1*e-7.44-2.88*arctan⁡(5.49*(epflat-1.7⁢1))-106.5*e-8.62-3.3⁢4*arctan⁡(5.49*(epflat-1.71))

The invention discloses a preparation method of a high-hardness wear-resistant coating, the high-hardness wear-resistant coating comprises FeCoCrNiMn high-entropy alloy powder and TiC powder, the TiC powder accounts for 0%-20% of the mass fraction of the FeCoCrNiMn high-entropy alloy powder, and the mechanical property and wear resistance of the coating material are effectively improved. The high-entropy alloy coating material is used for preparing a coating, and the method is specifically implemented according to the following steps that firstly, the surface of a base material is pretreated; 2, the FeCoCrNiMn high-entropy alloy powder and the TiC powder are subjected to ball milling, mixing and machining; and 3, laser power parameters and the scanning speed are set, the coating is prepared through laser cladding equipment, and the method is used for preparing the high-entropy alloy coating.

The present application discloses a long-life energy-saving anode conductive device for aluminum electrolysis. The anode conductive device comprises an anode guide rod, an aluminum-titanium steel explosion welding block with reinforcing ribs, and an anode steel claw. The surface of the aluminum-titanium steel explosion welding block is stacked with an aluminum layer, a titanium layer, and a steel layer from the inside to the outside, the reinforcing ribs are fixedly connected to the aluminum layer of the aluminum-titanium steel explosion welding block, the lower end face of the anode guide rod is welded to the aluminum layer of the aluminum-titanium steel explosion welding block through an aluminum-aluminum lap weld, and the upper end face of the anode steel claw is welded to the steel layer of the aluminum-titanium steel explosion welding block through a steel-steel butt weld. In this technical solution, the brittle phase generated by welding of dissimilar materials of aluminum and steel is avoided; the reinforcing ribs are fixed relative to the explosion welding block to avoid thermal strain generated during welding; and a high entropy alloy coating is prepared on the surface of the steel claw leg to improve corrosion resistance. According to the test of the embodiment, the voltage drop is reduced by more than half during conduction. The present invention has the characteristics of low voltage drop, high connection strength, good corrosion resistance, long service life, etc., and has obvious economic and social benefits.

The invention provides a process parameter optimization method for an entropy alloy coating in high-speed laser cladding, and belongs to the field of high-speed laser cladding. Comprising the following steps that firstly, laser cladding process parameters serve as input, the aspect ratio and microhardness of a cladding coating serve as output, and a high-speed laser single-channel cladding experiment is conducted through a center composite design (CCD) experiment scheme; then, according to a CCD experiment result, establishing a back propagation (GABP) neural network prediction model optimized by a genetic algorithm based on laser cladding process parameters and cladding layer aspect ratio and microhardness; and finally, on the basis of a second-generation non-dominated sorting genetic algorithm (NSGA-II), by taking the aspect ratio of the cladding layer and the microhardness as optimization targets and taking a GABP neural network prediction model as a fitness function of the NSGA-II, obtaining a Pareto leading-edge solution set through global optimization to complete process parameter optimization. The method has the technical effects that the defects of a trial and error method, a single variable method and other traditional optimization methods can be avoided, the experiment time is saved, the cost is saved, the cladding layer which is metallurgically bonded with the matrix and has no obvious cracks and holes can be obtained through the determined optimal process parameter combination, and the method is simple, high in universality and suitable for industrial production. And the method can be popularized and used for determining process parameters of other coatings in high-speed laser cladding.

The invention belongs to the technical field of surface engineering protective coatings, and discloses a nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating as well as a preparation method and application thereof. The preparation method comprises the following steps that firstly, a magnetron sputtering technology is adopted, a CoCrFeMnNi target serves as a cathode target material, and a corrosion-resistant high-entropy alloy coating is obtained through deposition on the surface of a base body; and then, in a three-electrode system, the corrosion-resistant high-entropy alloy coating is placed in an electrolyte containing a nitrogen heterocyclic onium salt compound to be subjected to electro-deposition, and the nitrogen heterocyclic compound modified corrosion-resistant high-entropy alloy coating is prepared. The corrosion-resistant inorganic-organic hybrid coating prepared by the invention has excellent corrosion resistance, can keep high stability and durability in a complex corrosion environment, and has relatively high corrosion potential and relatively low corrosion current density. The coating can remarkably prolong the service life of a structural base material, is suitable for various harsh working conditions, and provides an efficient and reliable protection solution for industrial application.

The invention discloses a multi-spectral-band compatible stealth coating based on a high-entropy alloy and a preparation method of the multi-spectral-band compatible stealth coating, and belongs to the technical field of functional high-entropy alloy coatings and preparation of the functional high-entropy alloy coatings. The problem that the visible light and infrared stealth effect of an existing stealth coating in a wide spectrum range is poor is solved. According to the preparation method, the high-entropy alloy film is prepared through the magnetron sputtering technology, efficient customization of material components and structures is achieved through scientific screening and optimal combination of elements and regulation and control of magnetron sputtering parameters, and therefore the high-entropy alloy film which is uniform, compact and excellent in performance is obtained. Test results show that the visible light band absorptivity of the high-entropy alloy coating is about 0.95, the infrared band emissivity of the high-entropy alloy coating is about 0.05, and multi-spectrum-band compatible stealth in the visible light and infrared spectrum range is achieved.

The invention discloses a method for improving the quality of a laser cladding refractory high-entropy alloy coating, and belongs to the technical field of alloy coatings. The refractory high-entropy alloy coating is composed of WMoTaNb and hydride of Ti or V, the refractory high-entropy alloy coating is a single BCC phase, and the refractory high-entropy alloy coating is prepared through coaxial powder feeding laser cladding. The laser cladding refractory high-entropy alloy coating prepared through an introduction method (solid solution strengthening and in-situ deoxidation) has excellent wear resistance and high-temperature oxidation resistance, the quality and performance of the refractory high-entropy alloy coating are improved through additional powder, and the microhardness of the section of the refractory high-entropy alloy coating reaches up to 674.52 HV0. 2. The coating can be applied to the fields of aerospace, nuclear reactors and the like.

The invention discloses a wear-corrosion-resistant and toughness-integrated multi-process coupling high-entropy alloy bionic structure coating and a preparation method thereof, and aims to solve the problems that the toughness of a high-entropy alloy is difficult to synergistically improve and the corrosion resistance is insufficient. In the high-entropy alloy bionic structure coating, Al < x > FeCoCrNiy eutectic high-entropy alloy powder serves as cladding powder, a laser cladding process is adopted for preparing an eutectic high-entropy alloy coating on the surface of a base material, FeCoCrNiX high-entropy metal ceramic powder serves as cladding powder, and a high-entropy metal ceramic layer is formed on the eutectic high-entropy alloy coating in a cladding mode through the laser cladding process. And then ultrasonic deep rolling treatment is carried out, and a high-entropy alloy film is deposited on the composite coating. Based on the shell-shaped biological structure, the high-strength-and-toughness eutectic high-entropy alloy layer with the two phases serves as a transition layer to connect the base body and the high-entropy metal ceramic layer, the high-entropy alloy composite coating of the structure with the strong outer portion and the tough inner portion is formed, the overall wear-resisting and friction-reducing performance of the coating is improved, and the corrosion resistance of the surface of the coating is improved.

The invention discloses a composite high-temperature wear-resistant gradient coating special for a titanium alloy knife edge. The composite high-temperature wear-resistant gradient coating comprises a Ni-Ti transition coating, a Co-based alloy coating and a Co-based ceramic composite wear-resistant coating which are sequentially arranged on the surface of the titanium alloy knife edge in a laser cladding mode. The preparation method comprises the following steps: 1, polishing and cleaning a titanium alloy knife edge; 2, Co-based ceramic composite wear-resistant coating powder is prepared; 3, drying the raw material powder; and fourthly, the dried powder serves as raw materials, and laser cladding of a Ni-Ti transition coating, a Co-based alloy coating and a Co-based ceramic composite wear-resistant coating is sequentially conducted on the treated titanium alloy knife edge. By controlling the gradient change of the contents of Ti and Ni elements in the Ni-Ti transition coating, Ti and Co elements are prevented from being combined to form a brittle phase, the cracking sensitivity of the Co-based alloy coating is reduced, and falling is prevented; according to the laser cladding method, the heat input amount is controllable, and the bonding strength of the coating and the titanium alloy knife edge base body is improved.

The invention discloses high-strength stainless steel for a wheel hub cover and a machining process of the high-strength stainless steel, and relates to the technical field of stainless steel machining. The specific processing technology comprises the following steps: weighing a stainless steel raw material, smelting under nitrogen pressurization, carrying out protective pouring to obtain a cast ingot, carrying out hot forging and hot rolling to obtain a hot-rolled plate, carrying out solution treatment and water quenching, sequentially carrying out multi-pass cold rolling and single-pass liquid nitrogen heat preservation cold rolling, annealing and aging treatment to obtain a stainless steel base material, and sequentially carrying out grinding, polishing, oil removal and acid activation to obtain the stainless steel plate. And then placing in an electroplating solution for electro-deposition of an alloy plating layer, cleaning after electro-deposition is finished, then carrying out laser cladding, finally carrying out heat treatment, and cutting a thin layer to obtain the high-strength stainless steel. Wherein cladding powder adopted for laser cladding comprises cobalt powder, chromium powder, nickel powder, aluminum powder, molybdenum powder, titanium powder, zirconium powder, nano carbon-nitrogen metal and tungsten carbide.

The invention provides an application of a surface conditioning agent in an aluminized neodymium-iron-boron magnet. The surface conditioning agent is prepared from the following components in parts by mass: 1 to 10 parts by weight of tetramethyl divinyl disilazane, 40 to 60 parts by weight of acrylic resin, 1 to 10 parts by weight of anionic surfactant, 1 to 20 parts by weight of dispersing agent and 1 to 20 parts by weight of stabilizing agent. The surface conditioning agent for the aluminized neodymium-iron-boron magnet, which is designed by the invention and has specific composition and proportion, can improve the performance of a neodymium-iron-boron magnet coating, especially the surface tension. According to the invention, a solution soaking process is adopted, and a soaking process of a surface conditioning agent is added on an aluminum alloy coating on the surface of a neodymium iron boron matrix, so that the surface tension of the coating can be remarkably improved, meanwhile, a certain effect on improving the corrosion resistance of the coating can be achieved, and the technical problems existing in vacuum aluminum plating can be effectively solved. The method does not need post-treatment, is simple in process and low in cost, does not generate waste gas / slag, and has good environmental protection property.

The invention provides a preparation method of a nickel-based WC alloy coating on the surface of a glass mold punch. The preparation method sequentially comprises the steps of matrix pretreatment, hypersonic flame spraying, ultrahigh-speed laser remelting and aftertreatment. The nickel-based WC alloy coating is prepared on the surface of the glass mold punch by adopting a supersonic spraying and ultra-high-speed laser remelting composite process, on one hand, a mechanical interlocking framework is formed by adopting nano-scale WC powder and micron-scale WC powder composite double-peak gradient powder, rare earth oxide is doped, nano-particle aggregation is inhibited through a vacuum ball-milling process, and the mechanical interlocking framework is formed by adopting a double-peak gradient powder composite double-peak gradient powder; the compactness of a cladding layer is improved; and on the other hand, the parameters of the composite technology are controlled, it is guaranteed that nanoscale WC is completely dissolved in a molten pool, a W-C-Fe diffusion layer is formed on an interface, a WC / W2C hard phase is separated out after micron-sized WC is partially dissolved, the bonding strength is improved, and the compactness and hardness of the coating are improved.

The invention discloses a preparation method for laser cladding of an iron-based alloy wear-resistant coating on the surface of an automobile brake disc, which comprises the following steps: (1) before cladding, putting iron-based alloy powder into a drying oven at 60 DEG C and drying for 120 minutes; (2) pretreating a matrix sample, removing rust and an oxide layer on the surface, cleaning the surface with absolute ethyl alcohol, and wiping to keep the surface dry; and (3) setting cladding process parameters, wherein the cladding process parameters comprise laser power, powder feeding amount, scanning speed, lap joint rate and scanning linear speed. And (4) a cladding experiment is started, and a cladding scanning path and mode are set, wherein the cladding scanning path and mode comprise a single-channel coating, a multi-channel lap joint coating and a whole-surface brake disc. And (5) after cladding is finished, waiting for natural cooling of the brake disc. The iron-based powder is used for preparing the coating on the surface of the automobile brake disc, technological parameters are optimized, the cladding procedure is simplified, the powder cost is low, the prepared coating is good in performance, and a single-layer coating scheme is provided for strengthening and repairing the brake disc.

The invention relates to the technical field of copper foil surface treatment, and provides a rolled copper foil surface treatment method, a high-corrosion-resistance rolled copper foil and application of the high-corrosion-resistance rolled copper foil. The rolled copper foil surface treatment method comprises the following steps that rolled copper foil is sequentially subjected to acid pickling treatment, roughening treatment, curing treatment, alloying treatment, anti-oxidation treatment and passivation treatment, and the high-corrosion-resistance rolled copper foil is obtained. The content of nickel ions in the surface coating of the high-corrosion-resistance rolled copper foil is 1500-2000 [mu] g / dm < 2 >. According to the invention, the complexing agent is added into the alloying liquid used for alloying treatment, and a uniform and compact alloy coating is formed on the surface of the copper foil under the action of the complexing agent, so that the corrosion resistance of the rolled copper foil is improved, the phenomenon of lateral corrosion generated when the copper layer is removed by etching is reduced, and the preparation requirement of a printed circuit board with the line width being less than 50 microns is better met.

The invention provides a magnesium alloy surface alloy coating performance regulation and control method based on multi-scale numerical simulation. The magnesium alloy surface alloy coating performance regulation and control method comprises the steps that S1, microscopic coordination structure and solvation structure characteristics of all metal ions in multi-metal ion liquid electrolyte are simulated and analyzed; s2, fitting a reduction reaction mechanism and kinetic parameters of solvated ions on an electrode interface under an atomic scale; s3, verifying and optimizing an electrochemical reduction path of an electrode interface; s4, obtaining an influence rule of electrode interface microenvironment evolution on the performance of the plating layer; s5, constructing a process parameter-performance mapping relation database, and reversely and dynamically optimizing the electro-deposition parameters; and S6, based on the optimized electro-deposition parameters, magnesium alloy is used as a cathode for electroplating, and a surface alloy coating which is high in bonding strength, resistant to abrasion and resistant to corrosion is obtained. According to the method, by combining atom-molecule-macroscopic multi-scale numerical simulation and machine learning, screening and performance optimization of the magnesium alloy surface coating can be rapidly and accurately achieved, and the screening period is shortened.