8611results about "Metallic material coating processes" patented technology

Provided is a robot posture optimization and follow-up control method and system for freeform surface repair. The system includes a worn surface reverse modeling module, a worn surface initial normal vector calculation module, an initial machining trajectory and normal vector extraction module, a normal vector rotation angle polynomial regression denoising module, a machining trajectory position and posture NURBS fitting module, a position and posture trajectory curvature adaptive segmentation module, a segmented trajectory position and posture synchronization acceleration and deceleration look-ahead module, and a robotic motion and laser process coordinated control module. The method and the system realize posture optimization and follow-up control in a cladding process of the robot, and ensures the processing quality of laser repair.

The invention provides an automobile brake caliper manufacturing method based on a selective laser melting additive manufacturing technology, which comprises the following steps: carrying out structural region division on a three-dimensional digital model, and formulating an SLM process parameter strategy of a structural region, the SLM process parameter strategy comprising adjustment of laser power, scanning speed, scanning spacing and powder layer thickness; according to a three-dimensional digital model of the brake calipers and an SLM process parameter strategy, additive powder is laid in a powder bed of SLM equipment, the surface of the powder bed is scanned layer by layer through high-power-density laser beams, powder particles are selectively melted, laser energy density input is controlled, thermophysical characteristics of powder materials are matched, microstructure evolution is controlled, and the brake calipers are manufactured. And after one layer is melted and solidified, the powder bed descends by the height of one layer thickness, a new powder layer is spread out, the process is circulated till additive manufacturing of the brake calipers is completed, and the effects of being light in weight, high in structural strength and good in heat dissipation effect are achieved.

The invention relates to a component of a brake for a vehicle, comprising a metal main body having a surface (5a, 5b) that is provided with a coating (B) for increasing the wear resistance thereof, said coating comprising an intermediate layer (Z) deposited on the main body (2) and a cover layer (D) deposited on the intermediate layer (Z), the cover layer (D) being formed from a stainless steel matrix (E) having hard material particles (HP) embedded therein. In order to furthermore confer optimized use properties to such a component, the invention proposes that the hard material particles (HP) embedded into the stainless steel matrix (E) of the cover layer (D) have an average particle diameter of 10 µm to 125 µm and that the hard material particles (HP) have a non-molten core region (K) which is composed of uninfluenced material of the hard material particles (HP), said core region being surrounded at least in sections by a mixing zone (M) formed by material of the stainless steel matrix (E) and material of the respective hard material particle (HP), by means of which the hard material particles (HP) are in each case connected to the stainless steel matrix (E) in an integrally bonded manner. The invention also proposes a method, by which such a coated component can be produced.

The invention relates to the technical field of steel rail repair, and provides a steel rail laser additive defect detection method and system.The method comprises the steps that before laser additive repair is conducted on a steel rail damage area, a local area of a steel rail base body is instantly heated, so that an instant hot spot is formed in the corresponding local area; collecting thermal radiation attenuation information of the instantaneous hot spot; according to the thermal radiation attenuation information, the actual heat dissipation rate of the local area corresponding to the instantaneous hot spot is calculated so as to achieve detection of the steel rail damage area; according to the actual heat dissipation rate, repairing process parameters used for laser additive repairing are selected from a pre-stored process parameter combination; and carrying out laser additive repair on the damaged region of the steel rail by adopting the repair process parameters. The method has the effect of improving the quality and reliability of steel rail laser additive repair.

The invention relates to the field of laser processing, and particularly discloses a laser cladding efficient cooling device which comprises a bearing plate, supporting rings are symmetrically arranged on the bearing plate, rotating ring discs are connected to the supporting rings through bearings, and driving mechanisms used for driving the rotating ring discs to rotate are arranged on the supporting rings. A clamping assembly used for clamping a workpiece is arranged on the rotating ring disc. The bearing plate is provided with a laser output device used for machining a workpiece. A supporting plate is arranged on the rotating ring disc, and a sliding assembly is arranged on the supporting plate. By means of rotation of the device, when the periphery of a workpiece is machined, the cooling assembly continuously blows cold air and adjusts the output temperature of the laser output equipment, so that the temperature is always kept within the normal range, effective combination of a coating and the workpiece is facilitated, the quality of the workpiece is improved, and the machining efficiency is improved; rapid cooling of the coating and the workpiece is facilitated, and forming of a standard machined part is facilitated.

The utility model discloses laser cladding equipment with a high-temperature heating function, which relates to the technical field of laser processing and comprises a working table, a supporting plate is fixedly connected to the upper surface of the working table, a sliding groove is formed in the supporting plate, an adjusting mechanism is arranged in the sliding groove, and a laser head is arranged above the working table. A protection mechanism is arranged above the workbench, and an induction heating ring is fixedly installed on the upper surface of the workbench. By arranging the induction heating ring, a workpiece above the workbench can be subjected to high-temperature heating pretreatment, by arranging the protection mechanism, energy in the heating process of the induction heating ring can be concentrated, the heating uniformity of the workpiece is improved, the heating speed of the workpiece is increased, and by using the induction heating ring and the protection mechanism in a matched mode, the heating efficiency is improved. And the workpiece can be subjected to high-temperature heating pretreatment in advance, so that the situation that cracks are generated due to overlarge thermal stress of a material in the cladding process can be reduced, and the overall quality of a cladding layer is improved.

The invention relates to the technical field of aluminum alloys, in particular to a high-fluidity corrosion-resistant aluminum alloy material for laser cladding as well as preparation and application of the high-fluidity corrosion-resistant aluminum alloy material. The material comprises the following components in percentage by mass: 3.12%-5.34% of nickel, 4.24%-6.76% of molybdenum, 6.54%-8.12% of cobalt, 10.45%-14.49% of silicon, 5.65%-8.45% of a functional additive, 1.25%-2.45% of cerium oxide, 3.46%-7.42% of yttrium oxide, 3.45%-7.58% of lanthanum oxide and the balance of aluminum, the functional additive is titanium carbide doped with Ti < 3 + >. The aluminum alloy material has high flowability during laser cladding and is well combined with a matrix, and related properties such as wear resistance, high temperature resistance, corrosion resistance and oxidation resistance of a coating formed by the aluminum alloy material are sufficiently uniform due to the high flowability of the aluminum alloy material.

The invention discloses an anti-corrosion coating method for a steel structure, belongs to the technical field of metal anti-corrosion coating, and solves the problems of reduced anti-corrosion effect and short maintenance period caused by incomplete pretreatment, insufficient coating adhesive force and poor complex environment adaptability in the existing anti-corrosion coating process for the steel structure. According to the technical scheme, the method is characterized by comprising the steps that the surface of the steel structure is pretreated through chemical oil removal, sand blasting and acid pickling and phosphating; epoxy zinc-rich primer, epoxy micaceous iron oxide intermediate paint and polyurethane finish paint are sequentially sprayed, and plasma treatment is introduced in the coating of each layer so as to enhance the interface bonding force of the coating; the uniformity and the corrosion resistance of the coating are optimized by regulating and controlling spraying parameters, plasma processing power and a gas ratio; and finally, a gradient heating curing process is adopted, so that the compactness and durability of the coating are ensured. The method is mainly used for long-term anti-corrosion protection of steel structures such as bridges and buildings, and the anti-corrosion performance and the service life in a complex environment can be remarkably improved.

The invention relates to the technical field of iron wire electrogalvanizing passivation monitoring, and discloses an iron wire electrogalvanizing passivation intelligent monitoring system with self-adaptive coating thickness control, and the system comprises a coating parameter analysis module which can analyze the matching degree of the coating thickness and the passivation effect according to the equipment operation state information, and generates a parameter analysis parameter set; based on the parameter set, the passivation feature extraction module extracts a space feature value and a distribution variable quantity of a passivation film on the surface of the iron wire to generate an optimized parameter set; the thickness correlation modeling module analyzes the correlation between the coating thickness and the passivation characteristics and generates a dynamic regulation and control result; the abnormal intervention adjustment module extracts a real-time feature matching rate and the like to generate an intervention adjustment data set; and the dynamic feedback regulation and control module analyzes the linkage demand and generates a feedback data table. The system can monitor the iron wire electrogalvanizing passivation process in a self-adaptive mode, the coating thickness is accurately regulated and controlled, and the passivation effect stability and the production efficiency are improved.

The invention belongs to the technical field of hydraulic support stand column surface laser cladding, and particularly relates to a hydraulic support laser cladding process parameter optimization method based on big data. Comprising the steps that S1, historical data of hydraulic support laser cladding from different coal mines under different working conditions are collected, and the historical data comprise technological parameters and corresponding coating performance; s2, cleaning, duplicate removal and standardization are carried out on the collected historical data; s3, finding out the correlation between the process parameters and the coating performance, extracting key process features and performance features, and constructing feature vectors; s4, on the basis of the extracted feature vectors, using a neural network to construct a prediction model between the process parameters and the coating performance; s5, optimizing laser cladding process parameters according to the constructed prediction model; and S6, the optimized laser cladding process parameters are applied to actual production. According to the invention, the automation and intelligence of the cladding process are realized, the individual requirements of different manufacturers are met, and the bonding performance of the cladding layer is improved.

The invention discloses a preparation method of a nickel-based tungsten carbide laser cladding wear-resistant gradient coating, which comprises the following steps: step 1, preparing mixed powder of a transition layer, a functional layer and a repair layer; step 2, pretreating a matrix: removing oxide skin on the surface of the matrix, polishing to be smooth, and preheating the matrix to 350-500 DEG C; step 3, sequentially preparing a first functional layer, a transition layer, a second functional layer and a repair layer by adopting a laser cladding process; and 4, coating post-treatment is conducted, specifically, the surface of the repairing layer is polished to the specified thickness, and the defect-free wear-resistant gradient coating is formed. Through gradient component layered design, the functional layer adopts high tungsten carbide content to maximize wear resistance, and the transition layer relieves thermal expansion difference between the coating and a matrix, reduces interface stress and reduces crack initiation; according to the repairing layer, micro-cracks and air holes generated in the cladding process are filled through low-hardness nickel-based components, and the compactness and surface integrity of the coating are remarkably improved.

The invention discloses a formula, a coating and a method of a dual in-situ precipitation reinforced FeCoNiCr-based high-entropy alloy composite material with a low corrosion-wear synergistic effect. The Al-Co-Cr alloy material comprises the following components in atomic percent: 15 to 30 at% of Al, 10 to 25 at% of Co, 10 to 25 at% of Cr, 10 to 25 at% of Fe, 10 to 25 at% of Ni, 20 to 35 at% of Ti and 5 to 15 at% of C, the preparation method comprises the following steps: filling all metal powder and graphene powder into a ball-milling tank, adding grinding balls, filling argon, sealing, and ball-milling, so as to obtain mixed powder in which the surfaces of metal powder particles are uniformly coated with graphene. The high-entropy alloy composite material with high hardness, high wear resistance and high corrosion resistance is obtained by utilizing the solid solution strengthening effect and the multiple in-situ precipitation strengthening effect of micron-scale TiC and nano-scale precipitation B2. The prepared coating is uniform and compact in structure, is metallurgically bonded with a base material, and has excellent corrosion and friction resistance and low corrosion-wear synergistic effect.

The invention provides a wire rod, a preparation method of the wire rod, a mining 2400MPa-grade steel strand and a manufacturing method and application of the mining 2400MPa-grade steel strand. The wire rod comprises the following chemical components in percentage by mass: 0.92-0.97% of C, 1.00-1.10% of Si, 0.50-0.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.10% of Cu, less than or equal to 0.015% of Ni, less than or equal to 0.40% of Cr, less than or equal to 0.1% of V and the balance of Fe. The preparation method of the wire rod comprises the following steps: designing chemical compositions of ingredients; the ingredients are subjected to converter treatment, LF refining and RH vacuum degassing, then two-time heating forming rolling forming is conducted, and a wire rod body is obtained; and the wire rod body is subjected to austenitizing heating and isothermal salt bath sorbite treatment. The steel wire rod disclosed by the invention has relatively high carbon element and silicon element contents, the initial strength is 1510 MPa or above, and the steel wire rod can be used for preparing mining 2400MPa-grade steel strands.

The invention provides a mold surface repairing method and system based on laser cladding, and relates to the technical field of laser cladding, the method comprises the following steps: selecting a matrix material with a proper size, and pretreating the surface of the matrix material; according to the actual process requirements, the value range of laser cladding process parameters is determined, and a response curved surface model of the microhardness and the dilution rate is established; optimizing the response curved surface model, and obtaining an optimized process parameter combination by taking maximization of microhardness and minimization of dilution rate as targets; according to the optimized technological parameter combination, the laser cladding process is carried out, and a cladding layer is formed on the pretreated base material; and performing performance detection on the formed cladding layer, and adjusting process parameters according to a performance detection result until an optimal process parameter combination is determined. By means of the method, it can be guaranteed that the hardness of the cladding layer is stabilized within the ideal range, the mold repairing quality is remarkably improved, and the service life of the mold is remarkably prolonged.

The invention discloses a film coating agent for accelerating stabilization of a weathering resistant steel rust layer in a severe atmospheric environment. The film coating agent comprises a film-forming agent and a spraying agent, the film-forming agent comprises a gel agent and a transforming agent; the gel is prepared from one or more of tannic acid, carbomer, chitosan and gelatin; the transforming agent comprises one or more of magnesium sulfate, zinc sulfate and sodium molybdate; the spraying agent comprises an accelerant and an aggressive agent; the accelerant comprises one or more of sodium sulfate, potassium sulfate and chromium sulfate; the aggressive agent comprises one or more of sodium chloride, aluminum chloride and sodium fluoride. The film coating agent provided by the invention can form a stable and uniform rust layer on the surface of the weathering resistant steel, so that the corrosion resistance of the weathering resistant steel is improved.

The invention relates to an aluminum steel dissimilar part and a preparation method thereof, and relates to the technical field of metal processing. According to the main technical scheme, an aluminum component of a set structure is deposited on a steel component through a friction extrusion deposition method, so that aluminum-steel interface connection is achieved, and an aluminum-steel dissimilar part is obtained; wherein the aluminum component is made of aluminum or aluminum alloy. According to the method, the aluminum-steel dissimilar part is prepared mainly through the friction extrusion deposition additive manufacturing process, a traditional aluminum-steel interface hard and brittle intermetallic compound layer is converted into a tough amorphous layer, and the problems that an existing aluminum-steel dissimilar part is low in interface tensile strength and prone to cracking are solved.

The invention relates to the technical field of circuit substrate manufacturing, and particularly discloses a preparation method of a composite solder sheet and an AMB ceramic copper-clad plate. The composite solder sheet is composed of an active metal foil and a copper-containing layer modified on the surface of the active metal foil, and the preparation method of the copper-clad plate comprises the following steps: after the surface of the active metal foil is pretreated, the copper-containing layer is deposited to prepare the composite solder sheet, and the composite solder sheet is placed between a copper substrate and a ceramic sheet to be pressed and assembled. And performing vacuum brazing on the assembly to complete the preparation of the ceramic copper-clad plate. A composite solder sheet containing active metal is adopted, high-temperature element diffusion during vacuum brazing is utilized at the diffusion temperature to achieve alloying of a composite solder layer, and then heat preservation is conducted at the brazing temperature to achieve uniform melting of solder and wetting metallurgical reaction between the solder and copper and between the solder and a ceramic substrate. By means of the preparation method, low-cost and high-reliability preparation of the AMB ceramic copper-clad plate can be achieved, and the prepared AMB ceramic copper-clad plate also has high peel strength and lower weld porosity.

Disclosed in the present invention are a TC4 titanium alloy surface composite wear-resistant coating and a preparation method therefor. The wear-resistant coating comprises a transition layer and a surface layer; the transition layer is attached to the surface of a TC4 titanium alloy by means of laser cladding, and the surface layer is attached to the transition layer by means of laser cladding; the transition layer comprises 70-90% of TC4 particles and 10-30% of WC particles; and the surface layer comprises 50-70% of TC4 particles and 30-50% of WC particles. The TC4 titanium alloy surface composite wear-resistant coating is provided with the transition layer and the surface layer, and the transition layer contains fewer WC particles than the surface layer; the transition layer contains more TC4 particles, and as the base material is also TC4 titanium alloy, the cladding performance and effect of laser cladding are better, and the bonding toughness is better, enhancing the bonding force between the transition layer and the surface of the TC4 titanium alloy. Moreover, the surface layer contains more WC particles, enhancing the wear resistance of the surface layer; and as the transition layer and the surface layer use the same cladding material, the bonding force and toughness of the transition layer and the surface layer are better.

The invention provides a long-acting rust converting agent for metal surfaces, and relates to the technical field of marine metal surface rust prevention and conversion, tannic acid, gallic acid and salicylic acid are matched with each other and can form a firm complex layer with formed metal oxide or metal through chelation, and the metal surface rust conversion effect is improved. The synergistic effect of the tannic acid corrosion inhibitor, the gallic acid corrosion inhibitor and the salicylic acid corrosion inhibitor enhances the exertion of the synergistic migration protection effect, a relatively compact and smooth conversion film can be formed on the rusted metal surface, the formed conversion film can effectively prevent a corrosion medium from permeating into the metal surface to make contact with the metal, and the metal corrosion inhibitor is suitable for steel structures, especially suitable for steel structure connecting parts and has good corrosion resistance and corrosion resistance. The rust remover has the advantages that the rust remover is good in permeability and high in rust conversion efficiency, harmful rust can be converted into a protective layer beneficial to corrosion prevention, effective protection is provided for a metal matrix, the corrosion prevention effect can reach 20 years or above, frequent maintenance is omitted, resources, manpower and material resources are saved, and remarkable economic benefits are achieved.

The invention provides an optimization method for metal surface laser cladding process parameters, and relates to the technical field of metal processing optimization, and the optimization method comprises the following process steps: step 1, determining an optimization target which is mainly used for determining a performance target of a cladding process and determining a quality target of the cladding process; 2, preliminary parameter selection and test design are mainly used for determining the cladding process parameter range and constructing a test model; step 3, test implementation and data acquisition; 4, data analysis and parameter optimization; and 5, verification and feedback adjustment are carried out. An orthogonal table is constructed by setting an orthogonal test, an optimal parameter combination is obtained by utilizing range analysis, a regression model equation can also be constructed by setting a response curved surface method test, and parameters are substituted into regression model parameters for operation, so that the optimal parameter combination can be obtained, the parameter optimization efficiency can be effectively improved, and the method is suitable for large-scale popularization and application. Meanwhile, records and experiences can be formed, and the method is widely applied to production practice.

The invention discloses a multi-degree-of-freedom ultrasonic-assisted laser cladding remanufacturing device and a working method thereof, and belongs to the field of laser cladding. Comprising a workbench, a to-be-machined workpiece arranged at the top end of the workbench through a positioning mechanism, a laser cladding mechanism erected above the to-be-machined workpiece and focusing type ultrasonic vibration mechanisms symmetrically arranged on the two sides of the laser cladding mechanism through a multi-degree-of-freedom variable-angle clamping mechanism. And focused ultrasound emitted by the focused ultrasonic vibration mechanism is aligned with a cladding area of the laser cladding mechanism. By adopting the multi-degree-of-freedom ultrasonic-assisted laser cladding remanufacturing device and the working method thereof, high-strength focusing of ultrasonic waves is realized through a multi-stage focusing method, and ultrasonic vibration can be uniformly applied during laser irradiation, so that the defects of cracks, air holes and the like are effectively reduced, and the processing quality and efficiency of laser cladding remanufacturing are improved.

The invention discloses a control method and system for a precise barrel plating process. A deep learning quality prediction model for performing quality analysis through mutual linkage of a graph neural network, a self-attention mechanism, a multi-task learning structure and a generative adversarial network is established; a technological parameter relation network for describing and representing the mutual relation between technological parameters is constructed, and a graph neural network, a self-attention mechanism, a multi-task learning structure and a generative adversarial network which are combined and linked with each other are analyzed based on the technological parameter relation network. According to the method, the implicit relation of mutual influence among the process parameters and the mutual relation between the process parameters and the product quality can be mined, so that the accuracy of quality prediction is improved. And on the basis, the current process parameters are adjusted in real time according to the plating layer prediction quality parameters, so that real-time precise control is realized, the quality of produced products is improved, the production efficiency is improved, and the cost is reduced.

The invention relates to a laser cladding system for mold repair and a control method of the laser cladding system, and belongs to the technical field of laser cladding. The laser cladding system comprises a central control unit; the scanning system is used for collecting a morphology signal of the surface of the workpiece and sending the signal to the central control unit; the infrared temperature measurement system is used for collecting temperature signals of a workpiece machining area and sending the signals to the central control unit; the central control unit carries out signal processing on the morphology signal and the temperature signal; the galvanometer system receives a two-dimensional deflection control instruction sent by the central control unit after signal processing; the deflector system is used for receiving a micro-angle adjusting instruction sent by the central control unit after signal processing; and the laser receives the temperature signal processed by the central control unit, adjusts laser process parameters according to the control signals of the galvanometer system and the deflector system, and processes the workpiece, so that the cladding precision, the processing stability and the automation level are remarkably improved.

The invention relates to the technical field of manufacturing and industrial process control, in particular to an intelligent control method and system for wind power bearing machining. The method comprises the following steps: acquiring monitoring data in a laser cladding process; based on the temperature dynamic prediction model, combined with the monitoring data, determining the predicted temperature of the next moment; according to the deviation between the predicted temperature and the target temperature, the adjustment amount of the laser power and the wire feeding speed is generated through optimization of a model prediction control strategy; the method also calculates a prediction residual error between the prediction temperature and the actual temperature at the next moment, and evaluates and adjusts model parameters of the dynamic temperature prediction model on line based on the prediction residual error to eliminate model mismatch; and finally, performing closed-loop control on a laser and a wire feeding system by applying the adjustment amount. According to the invention, through adaptive adjustment of the prediction model, the influence caused by sudden change of working conditions can be overcome, and the accuracy of temperature prediction is improved.

A tool includes a cemented carbide part and a maraging steel part, wherein the two parts are joined by brazing. The cemented carbide part has a hard phase embedded in a metallic binder phase matrix. The maraging steel part has a hardness of between 350 and 600 HV1 with a standard deviation between 0 and 20 HV1. A method of making such tool is also provided.

The invention discloses a laser cladding WC particle reinforced nickel base alloy gradient composite coating on the surface of non-magnetic steel, and a preparation method of the composite coating aims at the problem that the performance of the non-magnetic steel in a severe service environment is insufficient, and comprises the following steps: firstly, carrying out mechanical grinding, abrasive paper polishing and ethanol cleaning pretreatment on a TWZ-2 non-magnetic steel substrate; inconel 625 and WC spherical powder with a specific particle size are adopted for cladding, and a bottom layer (Inconel 625-0% WC), a middle layer (Inconel 625-15% WC) and a top layer (Inconel 625-30% WC) are subjected to a structure design gradient process; the laser power is 2400W, 2600W and 2900W in sequence; the scanning speed is 750 mm / min, the scanning speed is 650 mm / min, and the scanning speed is 780 mm / min; the powder feeding speed is 21.6 g / min, 23.8 g / min and 28.4 g / min; and the lap joint rate is 45%. The substrate is preheated at 250 DEG C before cladding, is subjected to heat preservation for half an hour, and then is slowly cooled to room temperature; the gradient composite coating prepared through the technology is compact in structure, free of defects and good in combination with a matrix, WC refines grains, the hardness, strength, toughness and abrasion resistance are improved through multiple strengthening mechanisms, the hardness of the coating is distributed in a gradient mode, and the requirement for the high-performance surface of non-magnetic steel in multiple fields is met.

A slurry for use to form or repair a silicon carbide coating is provided. In one aspect, the slurry includes solid particles and a carbonaceous resin. The solid particles include silicon carbide particles, silicon particles, and carbon particles. A method of fabricating a silicon carbide coating is also provided. In one aspect, the method includes applying the slurry, heating the slurry, and forming the silicon carbide coating from the solid particles and the carbonaceous resin. A method of repairing a silicon carbide coating is also provided. In one aspect, the method includes applying the slurry to a damaged region of the silicon carbide coating, heating the slurry, and repairing the silicon carbide coating with the solid particles and the carbonaceous resin in the damaged region.

The invention discloses a cold-rolled silicon steel thin strip and a processing method thereof, and relates to the technical field of silicon steel strips. According to the method, the silicon steel plate is cold-rolled into the ultrathin silicon steel strip, then the ultrathin silicon steel strip is subjected to activating treatment through the activating solution and then coated with the anti-corrosion coating, and the prepared ultrathin silicon steel strip has good corrosion resistance. According to the invention, phytic acid and modified polyaspartic acid are added into an activating solution. According to the iron-based organic framework material, polysuccinimide is used as a raw material, dopamine is added for grafting modification, a polymer which takes polyaspartic acid as a framework and is grafted with dopamine is obtained, the dopamine has a catechol group, and the chelating property of the polyaspartic acid to metal ions on the iron-based organic framework material is further enhanced. And meanwhile, phytic acid is added into the activating solution, the phytic acid and the modified polyaspartic acid can form a nano-porous structure, loading of subsequent modified silica sol is facilitated, and therefore the corrosion resistance of the ultra-thin silicon steel strip is further enhanced.

A steel sheet has a chemical composition including in wt % C: 0.2-0.4%, Mn: 0.8-2.0%, Si: 0.1-0.5%, Al: 0.01-0.1%, Ti: 0.01-0.1%, B: 0.0005-0.005%, P≤0.040%, Ca≤0.01%, S≤0.006%, N≤0.01%. The steel sheet includes from the bulk to the surface of the coated steel sheet a bulk and a skin layer occupying the outermost 10% of the thickness on either side of the bulk. The bulk includes an inclusion population in which the sum of clustering indexes of MnS and TiN / Ti(C,N) inclusions is less than or equal to 300 μm / mm2. This allows to manufacture hot pressed parts having a tensile strength equal to or greater than 1300 MPa and a bending anisotropy equal to or lower than 7°.

The invention discloses a wire feeding type aluminum alloy laser cladding method based on pre-paved reinforced particles, which comprises the following steps: placing a rectangular mold on the surface of an aluminum alloy matrix, adding TiC particle powder, and scraping redundant powder by using a scraper; according to the method, the characteristic that the TIC powder is high in laser absorptivity is utilized, the TIC powder is flatly laid on the aluminum alloy matrix to reduce the laser reflectivity of the aluminum alloy, the consistency and stability of the coating in the cladding process are guaranteed through push-pull wire feeding, bubbles are reduced, and the laser cladding efficiency is improved. Good toughness and machinability of an aluminum alloy matrix are organically combined with high hardness and high wear resistance of a ceramic reinforced phase, meanwhile, an oxidation film on the surface of the aluminum alloy is broken by using swinging laser, the cladding coating is high in performance, ceramic particles are uniformly distributed, the processing method is simple and easy to implement, the high-performance aluminum alloy cladding coating is prepared, and the service life of the aluminum alloy cladding coating is prolonged. And the aluminum alloy surface wear resistance is obviously improved.