370 results about "Surface corrosion" patented technology

The invention relates to the technical field of image enhancement, in particular to a protector bimetallic strip detection method based on machine vision, and the method comprises the steps: obtaining a surface image of a bimetallic strip, and carrying out the preprocessing of the surface image, and obtaining a gray image; performing threshold segmentation on the grayscale image to obtain at least one segmentation region; obtaining an evaluation coefficient of each segmented region, obtaining an adaptive cutting parameter when contrast-limited adaptive histogram equalization is carried out on each segmented region according to the evaluation coefficient of each segmented region, and carrying out image enhancement on each segmented region in the grayscale image according to the adaptive cutting parameter to obtain an enhanced grayscale image; the corrosion detection result in the bimetallic strip is obtained by using the enhanced gray level image, so that the enhanced image can reflect more effective information, and the surface corrosion detection precision of the bimetallic strip according to the enhanced image is improved.

The invention discloses a composite optical detection method and system for metal surface corrosion, and the method comprises the steps: employing a line scanning camera and a spectrum confocal sensor to carry out the synchronous data collection through a time-space registration method, obtaining the RGB image data of a to-be-detected metal surface through the line scanning camera, i.e., color data, and obtaining the color data of the to-be-detected metal surface; acquiring point cloud data, namely morphology data, of the metal surface to be detected by using a spectral confocal sensor; carrying out multi-modal data fusion on the RGB data and the point cloud data; a data fusion result is optimized by introducing a confidence coefficient weight; a double-threshold segmentation method of a color threshold and a depth threshold is adopted, and a corrosion area in an optimized data fusion result is preliminarily identified; performing morphological post-processing on the preliminary recognition result through opening operation and closing operation to generate a final recognition result; and carrying out quantitative evaluation on the corrosion area by utilizing a final identification result. The method provided by the invention can realize a rapid and accurate detection process.

The invention discloses a fuel rod cladding surface corrosion product deposition test device and method, and belongs to the field of nuclear power. The fuel rod cladding surface corrosion product deposition test device comprises a water supply section and a test section, the test section comprises a high-pressure kettle and a cladding pipe contained in the high-pressure kettle, and a heater is arranged in the cladding pipe to simulate heating of a fuel rod; the water supply section is used for providing circulating solution for the test section and comprises a coolant water tank, a dirt source water tank, a heating device, a pump set and a circulating pipeline, the coolant water tank circularly intervenes in the circulating pipeline to provide circulating simulated coolant, the dirt source water tank is used for injecting simulated dirt liquid into the circulating pipeline, the pump set is used for providing driving force, and the heater is used for heating. The device can accurately control the hydrochemical conditions of the dirt deposition test, keeps the consistency and repeatability of the test conditions in the test process, effectively improves the simulation test precision, and optimizes the test efficiency.

The invention discloses a strain clamp defect detection method based on X-ray-visible light dynamic fusion, and belongs to the technical field of intelligent detection of power equipment. Aiming at the problems of single-mode detection limitation, static fusion weight solidification and internal and external defect semantic association deficiency in a traditional method, the method is innovated in the following aspects: X-ray and visible light channel weights are distributed in real time through a dynamic channel attention mechanism (DECA) in combination with environmental parameters and feature quality; dynamic fusion is realized by adopting a gradient fusion optimization method; a graph neural network (GNN) is constructed, internal cracks detected by X rays and surface corrosion identified by visible light are mapped into graph nodes, an edge connection rule is defined based on a strain clamp physical structure, causal reasoning of internal and external defects is realized by using a graph attention mechanism (GAT), detection precision and environment robustness can be effectively improved, and operation and maintenance decision precision is promoted.

The application discloses a kind of ship super-long anticorrosion special nano powder coating, preparation method and application, belong to ship heavy anticorrosion material technical field.The preparation method of the ship super-long anticorrosion special nano powder coating is as follows: epoxy resin, graphene modified epoxy resin, core-shell structure ZnO@SiO2, modified 2,5-dimercapto-1,3,4-thiadiazole, borosilicate glass powder, flaky boron nitride, silane coupling agent modified silica, phenolic amine curing agent, 2-ethyl-4-methylimidazole, fumed silica, defoaming agent, ultraviolet absorber, high-temperature pigment are put into stirrer and stirred for 20-30min, then melt extrusion is carried out through double screw extruder, the extrusion temperature is 90-110 DEG C, grinds and sieves, and the ship super-long anticorrosion special nano powder coating is obtained.The coating prepared by the application has good anticorrosion performance and can be applied in the field of ship metal surface corrosion protection.

The invention discloses an acid liquid system based on synergistic interaction of a corrosion inhibitor and an iron stabilizer and a preparation method, and relates to the technical field of oilfield chemistry, the acid liquid system comprises the following components by mass: 10%-20% of an acid liquid, 0.5%-3% of a composite corrosion inhibitor, 0.5%-2% of an iron stabilizer, 0.1%-0.5% of a discharge aiding agent, 0.2%-0.8% of an acid thickening agent, and the balance of water; the main component of the composite corrosion inhibitor in the acid liquid system is long-chain alkyl bis-imidazoline-thiadiazole amide hydroxypropyl sulfobetaine, and the composite corrosion inhibitor contains a bis-imidazoline ring and a thiadiazole amide ring, and can form more stable multi-active-site adsorption on the metal surface to form a compact and stable protective film, so that the metal surface corrosion resistance is improved, and the metal surface corrosion resistance is improved. Long carbon chains in molecules can effectively block corrosive media, N, O and S heteroatoms in the molecules are adsorbed on the iron surface through lone pair electrons to inhibit corrosion, the slow-release effect is further enhanced, and therefore the slow-release efficiency is improved by 40% or above.

The invention belongs to the technical field of corrosion and protection simulation analysis, and particularly relates to a multi-physics coupling corrosion simulation method for a metal material in a seawater environment, which comprises the following steps: firstly, carrying out stress and deformation calculation on a structure, and then, carrying out analysis fitting on a polarization test result of the material according to the electrochemical corrosion condition of the structure in seawater, so as to obtain a simulation result; and finally, according to the mutual influence effect between stress and electrochemistry, establishing a coupling path, realizing multi-physics coupling simulation, and quickly calculating to obtain the corrosion potential and the corrosion current density on the surface of the structure and the corrosion rates at different positions, thereby determining the most sensitive position of corrosion. By establishing an independent simulation boundary module database, rapid calling and reading of simulation boundary parameters are achieved, rapid iterative calculation of long-period corrosion evolution is achieved, corrosion evaluation efficiency is greatly improved, and the problems that in the equipment service process, seawater corrosion prediction precision is low, and the test period is long are effectively solved.

The invention aims to provide an aircraft blade detection probe and method based on flexible double-frequency differential eddy current, and relates to the technical field of nondestructive testing, when defect detection of an aircraft blade is carried out, a flexible substrate can be adaptively attached to a complex curved surface of the blade; the double-frequency excitation coil cooperatively works through high frequency and low frequency and respectively captures surface micro-cracks and subsurface corrosion defects, and when differential signal amplitude fluctuation occurs in the differential receiving coil, it can be judged that abnormal damage exists in a corresponding blade area; if the coil induction signal is kept stable and unchanged, the corresponding area is in a normal state, and the geometric characteristics of the damaged part can be quantitatively analyzed by observing the numerical range of the amplitude change; specifically, the intensity of signals output by the induction lines and the integrity of the blade structure are in positive correlation, and the larger the fluctuation value is, the more serious the damage degree is.

The present invention provides a three-dimensional reconstruction method for surface corrosion defects of a rotating electromagnetic field structure. First, a magnetic field image sample library of surface corrosion defects of the rotating electromagnetic field structure is established through simulation and experiments. Then, a three-dimensional reconstruction network for surface corrosion defects of the structure is constructed. The network structure uses Pix2Pix, and the loss function combines a data loss function and a physical loss function. Furthermore, the established reconstruction network is trained to obtain the optimal solution. Finally, the trained network is deployed on a rotating electromagnetic field detection system. The present invention first provides an effective method for the three-dimensional reconstruction of surface corrosion defects of the structure. Moreover, since it is difficult to obtain a large number of samples of real surface corrosion defects of the structure and the production is expensive, the present invention realizes the accurate reconstruction of the three-dimensional contour of surface corrosion defects of the structure under small samples by means of a dual-drive method of physics and data, providing reliable data support for the safety assessment and maintenance decision-making of the structure.

The invention relates to the technical field of measurement and testing, and discloses a method and device for detecting corrosion and pits on the outer surface of a pipeline, and the method comprises the steps: synchronously collecting three-dimensional point cloud and temperature field distribution of the surface of the pipeline and ultrasonic echo and visible light images, and constructing a four-dimensional information matrix; processing the point cloud data and the infrared image, extracting a pit morphology parameter and a corrosion roughness index of the point cloud, and obtaining a maximum temperature gradient of the infrared image and a texture feature of the visible light image; constructing a channel attention network adaptive weighted fusion multi-source feature, segmenting a corrosion region, and classifying pit defects by using a graph convolutional network based on a point cloud topological graph structure; calculating allowable working pressure of the corrosion area, triggering early warning, evaluating a pit strain concentration coefficient, and generating a detection result. The problems that in the prior art, the omission ratio is high, a single sensor cannot recognize small defects sufficiently, and oil stain rusty spot interference misjudgment exists are solved, and the purposes of high detection precision, low maintenance cost and high automation degree are achieved.

The present invention provides a method and system for statistics of thickness of corrosion product film based on image processing, comprising obtaining overall image by stitching plurality of cross-sectional images of the corrosion product film on surface of pipeline; obtaining feature area of the corrosion product film by segmenting the overall image; performing division of the thickness layers on the feature area of the corrosion product film according to number of pixel points in vertical direction of thickness; counting the number of pixel points of each of the thickness layers; obtaining the thickness of each of the thickness layers according to counted number of pixel points; and, performing statistics of thickness after obtaining the overall image representing larger area of the corrosion product film on the surface of pipeline by stitching the plurality of images.

The invention discloses a method for improving performance of rare earth permanent magnet sintered neodymium iron boron grain boundary diffusion, and belongs to the technical field of rare earth permanent magnet materials. The method comprises the steps that a low-melting-point metal layer and a diffusion layer containing heavy rare earth elements are sequentially formed on the surface of a clean sintered neodymium-iron-boron magnet, and then vacuum diffusion heat treatment and tempering treatment are conducted. Wherein the low-melting-point metal layer comprises at least one of copper, aluminum, gallium and tin or an alloy of the copper, the aluminum, the gallium and the tin; the heavy rare earth element comprises at least one of dysprosium, terbium, holmium and gadolinium. The low-melting-point metal layer is preferentially diffused and wets the grain boundary in the heat treatment process, heavy rare earth elements are promoted to be deeply and uniformly diffused towards the interior of the magnet along the grain boundary, so that a heavy rare earth-rich shell layer is formed outside main phase grains of the magnet, and the intrinsic coercive force is improved; meanwhile, the low-melting-point metal forms a strengthening phase at the grain boundary, the brittleness of the magnet after diffusion is improved, the surface corrosion phenomenon is restrained, and collaborative optimization of the comprehensive performance of the magnet is achieved.

This invention discloses a method for analyzing the fracture surface of high-Cr steel or alloy steel that cracks in a high-temperature environment. The method involves cutting a metallographic sample at the crack tip of a crack-containing block, polishing it, visually observing the crack morphology, and analyzing the composition of corrosion products on the sample. The sample is then etched with an etchant, and the relationship between the crack direction and the microstructure of the sample is observed under a metallographic microscope to obtain the crack metallographic test results. The remaining crack in the crack-containing block is opened, and the macroscopic features of the fracture surface are visually observed. The microscopic features of different regions of the fracture surface are observed using a scanning electron microscope, and the composition is tested to obtain the micro-region composition. The surface corrosion of the fracture surface is removed using an electrostatic descaling method, and the microscopic features of different regions of the fracture surface are observed under a scanning electron microscope. Based on the crack metallographic test results, the macroscopic and microscopic features of the fracture surface, and the micro-region composition, the cause of the cracking is determined. This invention provides a complete analytical procedure, yields abundant information, and effectively analyzes the causes of component cracking.

The invention relates to the technical field of material surface corrosion prevention, in particular to a spraying method for a heavy anti-corrosion coating of a port steel structure. The method comprises the following steps that (1) sand blasting derusting treatment is conducted on a steel structure base body, so that the cleanliness of the steel structure base body reaches the Sa2.5 level, and the roughness is controlled to range from 40 micrometers to 75 micrometers; 2) coating the treated substrate with epoxy zinc-rich primer, and doping graphene modified zinc powder accounting for 1-3% of the total mass of the primer to form a primer layer with a dry film thickness of 60-80 [mu] m; (3) after the primer layer is cured, the primer layer is coated with epoxy micaceous iron oxide intermediate paint, aluminum tripolyphosphate accounting for 2-5% of the total mass of the intermediate paint is further added into the epoxy micaceous iron oxide intermediate paint, and an intermediate paint layer with the dry film thickness being 150-200 microns is formed; 4, the middle paint layer is coated with weather-resistant finish paint, and a finish paint layer with the dry film thickness being 60-80 microns is obtained.According to the method, the adhesive force, chloride ion permeation resistance, salt fog resistance (larger than or equal to 3000 hours) and weather resistance of the coating are remarkably improved, the method is suitable for the harsh marine environment, and the service life of the steel structure can be prolonged to 20 years or above.

The invention discloses a full-automatic intelligent grading method and system for strip steel surface corrosion and a storage medium, and relates to the field of intelligent detection. Continuously acquiring a strip steel surface image which is being processed in the chemical agent pool according to a preset period, and preprocessing the strip steel surface image to reconstruct the strip steel surface image as an image to be detected; collecting surface color information of the to-be-detected image, determining a suspected corrosion connected domain in combination with the surface color information, and obtaining a gray difference value and a gray change parameter in the suspected corrosion connected domain; edge pixel points of the suspected corrosion connected domain are extracted according to the gray difference value and the gray change parameter, the edge of the corrosion connected domain is determined, and the area of the suspected corrosion connected domain is calculated; and determining the corrosion depth according to the gray difference value and the gray change parameter, and determining the surface corrosion level of the strip steel in combination with the corrosion depth and the corrosion connected domain area. The method can avoid excessive treatment on the strip steel which does not reach the corrosion degree, and saves treatment resources such as chemical agents.

The invention discloses a surface corrosion-resistant invar alloy precision strip for a liquid cargo cabin of a liquefied natural gas carrier and a manufacturing method. The surface corrosion-resistant invar alloy precision strip comprises the following components: 35.6%-37.1% of Ni, 0.35%-0.80% of Si, 0.05%-0.10% of Ce, 0.015%-0.030% of C, less than or equal to 0.35% of Mn, 0-0.0008% of O, less than or equal to 0.01% of N, less than or equal to 0.003% of S, less than or equal to 0.005% of P, less than or equal to 0.20% of Cr, less than or equal to 0.20% of Cu, less than or equal to 0.05% of Al, less than or equal to 0.003% of Ti and the balance of iron and inevitable impurity elements. According to the formula, through EAF, AOD, LF, continuous casting or die casting, hot continuous rolling or solid solution pickling after forging, cold rolling in multiple rolling processes, annealing and protective film prefabrication treatment, the temperature range of the prepared material is about 1.5-1.8 * 10 <-6 > / DEG C from-163 DEG C to 20 DEG C, the yield strength Rp0.2 value is larger than or equal to 300 MPa, the tensile strength Rm value is larger than or equal to 480 MPa, the ductility A50 is larger than or equal to 35%, surface corrosion does not occur within the machining period or storage and transportation time of 15 days under the conventional condition, and the service life of the material is prolonged. And particularly, the risk of surface rusting in the processing, storage and transportation processes is greatly reduced.

The invention relates to the technical field of processing, testing or inspection of aircraft parts, and provides a surface corrosion evaluation method for an aluminum alloy plate with an epoxy coating, which comprises the following steps: acquiring an aluminum alloy plate sample with an epoxy coating at different time after being exposed in a coastal atmospheric environment, collecting two-dimensional closed corrosion area image data of the surface of the sample, and calculating the surface corrosion of the aluminum alloy plate with the epoxy coating according to the two-dimensional closed corrosion area image data; processing the image to extract a closed boundary of the corrosion area; calculating the boundary length of the corrosion area and the included corrosion area, and calculating the fractal dimension of the corrosion area based on the length and the area; according to the method, the correlation model between the fractal dimension of the corrosion area and the exposure corrosion time is established, the interval distribution of the fractal dimension under different corrosion time is determined, the method is used for evaluating the corrosion state and the development trend of the corrosion state, the limitation of parameter evaluation modes such as subjective judgment and single corrosion depth is avoided, and the accuracy and objectivity of a corrosion evaluation result are effectively improved.

The invention discloses an acoustic resonance assisted nano-SiO2 coated flaky carbonyl iron powder as well as a preparation method and application thereof, the flaky carbonyl iron powder is taken as a main raw material, an acoustic resonance assisted modification technology is adopted, a compact and uniform SiO2 coating layer is constructed on the surface of the flaky carbonyl iron powder, and an FCIP coated SiO2 composite material with a core-shell structure is prepared. According to the coating treatment, the oxidation resistance and corrosion resistance of the carbonyl iron powder are remarkably improved, electromagnetic parameters of the carbonyl iron powder are regulated and controlled, and particularly the wave absorbing performance of the material in a low-frequency wave band is enhanced. An electromagnetic parameter test and reflection loss calculation show that the obtained composite material has better impedance matching characteristics and lower reflection loss value. In practical application, a coated sample shows higher thermal stability and lower surface corrosion rate, and the service life of the material in a complex service environment is effectively prolonged. The method is simple and convenient in process, low in cost and suitable for being applied to functional material systems such as electric conduction, wave absorption and electromagnetic interference prevention on a large scale.

The invention provides a treatment method for synergistically enhancing the comprehensive performance of a neodymium-iron-boron magnet, and belongs to the technical field of magnetic materials. According to the method, a heavy rare earth layer and a corrosion-resistant metal layer such as copper, nickel and cobalt for promoting grain boundary diffusion of heavy rare earth are respectively deposited on the surface of the neodymium-iron-boron magnet by adopting a multi-layer electroplating method, the coercivity of the neodymium-iron-boron magnet is enhanced through grain boundary diffusion, and the corrosion resistance of the magnet is enhanced through a nickel-cobalt coating. The treatment method comprises the following steps: carrying out electrochemical deposition on the neodymium-iron-boron magnet in a heavy rare earth metal plating solution, and then respectively electroplating a copper plating layer and a nickel-cobalt plating layer to obtain a heavy rare earth-containing plating layer with strong corrosion resistance and good plating film binding force; the neodymium-iron-boron magnet containing the heavy rare earth coating is subjected to heat treatment, and the coercive force of the magnet is improved through heavy rare earth grain boundary diffusion. The neodymium iron boron grain boundary diffusion process and the surface corrosion prevention process are subjected to integrated treatment, the technological process of high-performance neodymium iron boron industrial preparation is shortened, and the coercive force and the corrosion resistance of the magnet are comprehensively enhanced.

The invention relates to the field of metal corrosion behavior monitoring and characterization, in particular to a rapid evaluation method for a material corrosion rate and influence factors in a high-level radioactive waste geological disposal environment. According to the method, two indexes are obtained based on electrochemical impedance spectroscopy measurement and relaxation time distribution analysis, namely an impedance modulus value Z0.01 Hz value corresponding to 0.01 Hz and a time constant log (tau / s) value corresponding to a dissolved oxygen reduction reaction. The Z0.01 Hz value and the log (tau / s) value when the material enters anaerobic corrosion from aerobic corrosion are taken as critical points, whether the material is in an aerobic corrosion state, a low-oxygen corrosion state or an anaerobic corrosion state is judged according to the measured Z0.01 Hz value and log (tau / s) value, and the coverage degree of corrosion products on the surface of the material and whether oxygen leakage occurs in a treatment environment are also judged. The method is suitable for rapidly evaluating the material corrosion rate and influence factors in the high-level radioactive waste geological disposal environment, and has the characteristics of simplicity, high operability, high accuracy and good long-term stability.

The utility model discloses an indirect heating type fuel rod simulation piece which comprises a cladding tube and an electric heating element, and the cladding tube is a corrosion product deposition test surface; the electric heating element is arranged in the cladding tube and is used for simulating heat generated by a nuclear fission reaction of the fuel pellet; high-purity helium is filled between the cladding tube and the electric heating element, and sealing of the fuel rod simulation piece is achieved through end plug welding at one end of the cladding tube and circumferential welding between the cladding tube and the electric heating element. According to the utility model, the actual structural characteristics and surface material properties of the fuel element are retained to the greatest extent while the surface thermal load state of the pressurized water reactor fuel element is simulated, so that the authenticity of corrosion product deposition test simulation and the reliability of obtaining test data are improved; and the method can also be used for experimental research on scale-caused accelerated corrosion after deposition of surface corrosion products.

The invention relates to the technical field of metal alloy corrosion resistance testing, and provides a metal alloy surface corrosion resistance testing device which comprises a rack and a cable, anchorage devices are arranged at the top and the bottom of the rack, the cable is installed between the two anchorage devices, a testing barrel is installed in the middle of the rack, and the testing barrel is connected with the cable. Four multi-tube bodies are arranged in the testing barrel, and a low-temperature cold air dryer and a blast heat dryer are mounted on the rack; under the cooperation of low-temperature cold air, high-temperature hot air and a corrosion solution, a low-temperature high-humidity and high-temperature high-humidity environment is created, so that the corrosion resistance of the cable is tested, an automatic telescopic rod pulls and pushes a rotating rod to rotate upwards or downwards, the distance among four multi-pipe bodies is changed, the pressure of the corrosion solution sprayed on the cable is adjusted, and the corrosion resistance of the cable is improved. Therefore, the penetration depth of the corrosion solution to the cable is controlled, and the corrosion effect of the cable when the corrosion solution permeates different depths is simulated.

The invention discloses a steel wire surface corrosion identification method based on deep learning, and the method comprises the steps: firstly collecting an image, carrying out the preprocessing of the image, building a data set, and then building an improved U-Net model, introducing an SE attention mechanism, inserting an SE module at the tail end of each encoder block, enhancing the network channel selectivity, carrying out the optimization of an up-sampling structure, and carrying out the recognition of the surface corrosion of a steel wire. The transpose convolution of the original Unet is replaced, and a semantic alignment module is introduced at a jump joint to carry out channel matching and fusion, so that semantic deviation is reduced; and then carrying out model training, evaluation, storage, deployment and reasoning. By fusing the deep learning algorithm, the steel wire surface image is intelligently analyzed, the corrosion type is accurately recognized, the corrosion area, depth and other indexes are quantitatively evaluated, the limitation of a traditional detection means in a complex environment is broken through, and real-time and efficient monitoring of steel wire corrosion is achieved.

The invention discloses a steel structure surface corrosion identification method and device, a medium and equipment, and relates to the technical field of image identification. The method comprises the steps of obtaining an image data set of a steel structure surface; according to the corrosion parameter of each image in the image data set, performing corrosion degree marking on each image to obtain a training data set; a Faster ViT module is used for replacing a C2f layer in a neck network of the YOLOv8 network, and an improved YOLOv8 network is obtained; taking the training data set as input, taking the corrosion degree of each image as output, and training the improved YOLOv8 network to obtain a corrosion identification model; and inputting a steel structure surface image acquired in real time into the corrosion identification model to obtain a corrosion identification result of the steel structure surface. According to the scheme, the accuracy and efficiency of identifying the surface corrosion of the steel structure can be improved.

The invention relates to the technical field of steel and discloses a surface corrosion-resistant treatment process for low-carbon steel. The method comprises the steps that S1, matrix steel is taken and cleaned, and a substrate layer is sprayed to the surface of the matrix steel through a plasma spraying method; the base layer comprises the following raw materials: Ni, Fe, Ti and TiO2 in a mass ratio of (70-80): (10-20): (3-8): (1-3); s2, a TiO2 layer is sprayed on the surface of the substrate layer through a plasma spraying method, and pretreated substrate steel is obtained; s3, the surface of the pretreated matrix steel is coated with a sealing coating, curing and drying are carried out, and low-carbon steel subjected to surface corrosion-resistant treatment is obtained; the sealing coating comprises the following raw materials in parts by mass: 100 parts of an organic silicon resin composition, 20-30 parts of modified titanium dioxide, 5-10 parts of composite modified silane and 20-30 parts of acetone.

The invention relates to the technical field of rare earth permanent magnet materials, in particular to a preparation process of a core-shell structure enhanced neodymium iron boron magnet. Through a multi-component composite formula of high-abundance rare earth and a small amount of heavy rare earth and in combination with a magnesium interface catalytic pretreatment and grain boundary diffusion technology, a Dy-rich shell layer is formed on the surface of a main phase grain, a core-shell structure is constructed, and the coercivity and the high-temperature stability are remarkably improved. An integrated continuous production technology is adopted in the preparation process and comprises the steps of vacuum melting, continuous ingot casting, jet milling, magnetic field forming and continuous sintering, laser-electrochemical integrated machining is integrated, and high-precision cutting and surface corrosion prevention are achieved. The invention further relates to special equipment, such as a multi-zone intelligent temperature control vacuum sintering furnace and double-shaft stirring-composite magnetic field powder equipment, so that the temperature uniformity and the powder orientation degree are ensured. According to the process, heavy rare earth dependence is reduced, the coercive force reaches 24 kOe or above, the high-temperature magnetic performance attenuation is smaller than or equal to 5%, the production cost is reduced, the efficiency is improved, and the process is suitable for the fields of motors, electronics and the like.

The application discloses a marine aluminum alloy plate oil immersion corrosion test method and device and a sample. A 50mm*50mm*4mm sample is processed on a marine aluminum alloy plate, and after surface treatment, the sample is placed in a special oil solution with a special ratio. Different test immersion periods are set. In the test process, a potentiometer is used to collect the potential change of the test sample. After the test, the average corrosion rate of the sample is calculated by the weight loss method, and the sample surface corrosion pit depth information is measured by a microscopic method, so that the corrosion evaluation of the marine aluminum alloy plate in the oil environment is realized. The application provides an evaluation method for the corrosion of the aluminum ship alloy plate in the oil environment. The method has high practical utility, is simple to operate, and can be popularized and used in the industry.

The present application relates to the technical field of electronic packaging materials, and particularly relates to a thick copper packaging circuit board capable of resisting high-salt mist corrosion and a preparation method thereof, which comprises the following steps: S1: preparing a glass fiber-BT resin composite core layer for standby; S2: preparing a fluorine-modified polyimide packaging coating solution for standby; S3: preparing a surface corrosion-resistant composite coating for standby; S4: bonding the thick copper foil and the glass fiber-BT composite core layer to obtain a thick copper conductor; S5: applying the fluorine-modified polyimide packaging coating solution to the surface of the thick copper conductor layer to form a packaging layer; S6: spraying the corrosion-resistant coating on the surface of the packaging layer to form a composite corrosion-resistant coating; and S7: performing overall curing and hot pressing to finally obtain a thick copper packaging circuit board product. According to the present application, a multi-layer synergistic protection structure is constructed and the preparation process is optimized, so that the corrosion resistance and structural stability of the thick copper circuit board in a high-salt mist environment are significantly improved.

The invention relates to a method for treating a silicon sample for an inert gas melting infrared absorption method, which comprises the following steps of: polishing, pretreating and corroding the surface of a silicon sample block, washing and drying to obtain the silicon sample, and corroding the surface of the silicon sample block by acid corrosion and alkali corrosion, the acid corrosion process comprises the following steps: mixing a nitric acid aqueous solution, a hydrofluoric acid aqueous solution and glacial acetic acid according to a volume ratio of (10-9): (2-3): (3-4) to obtain a mixed acid corrosion solution, dividing the mixed acid corrosion solution into two parts according to a volume ratio of 4: (3-4), putting one part of the mixed acid corrosion solution and a silicon sample block into a reactor, and reacting for 8-10 minutes until a large number of bubbles start to appear on the liquid surface, after a large amount of smoke is generated on the surface of the liquid level, the other part of the mixed acid corrosion liquid is added into the reactor to change the reaction path in the reactor and further control the reaction rate in the reactor, an oxide layer on the surface of a silicon sample can be thoroughly removed, and the accuracy of measuring the oxygen content of a semiconductor material through an inert gas melting infrared absorption method is improved.