457 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.

A fire retarding biochemical liquid composition including: a dispersing agent realized in the form of a major amount of water, for dispersing alkali metal ions dissolved in the water; a major amount of a first fire retarding agent realized in the form of a first alkali metal salt of a nonpolymeric saturated carboxylic acid, specifically, tripotassium citrate, for providing metal potassium ions dispersed in the water when the at least one alkali metal salt is dissolved in the water to form a mixed retardant solution; a minor amount of a second fire retarding agent realized in the form of a second alkali metal salt of a nonpolymeric saturated carboxylic acid, specifically, sodium benzoate (SB), for providing metal sodium ions dispersed in the water when the at least one alkali metal salt is dissolved in the mixed retardant solution, for functioning as a secondary fire retardant agent and also inhibiting surface corrosion reactions involving metals contacting the mixed retardant solution, including specific metals, namely 2024-T3 Aluminum, 4130 Steel, Yellow Brass, and Az31B Magnesium; a minor amount of thickening agent in the form of a biomolecular polymer consisting of polysaccharides, for increasing the viscosity of the mixed retardant liquid during application operations; a minor amount of coloring agent in the form of fugitive color dye powder, or non-fugitive pigment powder, for imparting a visible color (e.g. red or green) when the fire retarding biochemical liquid composition is applied to a surface to be protected against fire, as water molecules in the retardant liquid coating evaporate to the environment during drying, to form a thin fire retardant coating deposited on the treated surfaces having a characteristic visible color, and comprising potassium and sodium salt crystals mixed within the polysaccharides of the biomolecular polymer. Wet and dry concentration formulations of the fire retarding biochemical liquid composition are disclosed for use with both serial and ground delivery methods and apparatus.

The invention discloses an improved YOLOv8-based steel structure surface corrosion detection method and system, and the method comprises the steps: employing a pre-trained improved YOLOv8 network model for a steel structure surface corrosion image to obtain a corrosion target detection result, and enabling the improved YOLOv8 network model to be based on a YOLOv8-OBB model, performing layer pruning on a deep convolutional layer of a backbone network of the YOLOv8-OBB model, introducing a context anchor point attention module CAA and a receptive field attention convolution RFAConv, and leading out shallow layer feature information of the backbone network to a neck network to realize feature fusion operation. The layer pruning refers to deletion of a convolutional layer of an eighth layer and a C2f layer of a ninth layer in the backbone network. The invention aims to solve the problems of low precision and excessive parameters of the existing corrosion target detection method, and realizes efficient, accurate and real-time steel structure surface corrosion target detection.

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 provides a titanium alloy surface laser ultrasonic composite cleaning reinforced welding method, belongs to the technical field of non-ferrous metal surface cleaning and modification, and aims to solve the problems of poor welding seam quality and poor surface corrosion resistance, fatigue resistance and the like in the titanium alloy welding process. The cleanliness of the surfaces of components, welding grooves and the like is improved, and the production and machining efficiency is improved. In the fusion welding process, ultrasonic excitation of a high-energy beam is applied to the back face of a weld joint, the grain size of the weld joint is refined, the mechanical property of a connector is improved, rotating ultrasonic waves are applied to the surface of a component and the weld joint, the component and the surface of the weld joint generate plastic deformation, and the overall performance of the component and the surface of the weld joint is improved. The high temperature resistance, the corrosion resistance, the fatigue resistance and the like are improved.

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 generator retaining ring surface corrosion defect automatic detection device, and relates to the technical field of corrosion detection, and the generator retaining ring surface corrosion defect automatic detection device comprises a base, a rotating mechanism, an autorotation mechanism, a clamping mechanism, a spraying mechanism, a removing mechanism and a fluorescence irradiation lamp. Through a rotating mechanism, an autorotation mechanism, a spraying mechanism, a removing mechanism and a fluorescent irradiation lamp, a second motor is controlled to operate, the generator retaining ring is driven to rotate, a first motor is controlled to operate, the generator retaining ring in a clamping mechanism rotates along with a rotating disc, a draw-off pump is controlled to operate, and a fluorescent agent is sprayed to the surface of the autorotation generator retaining ring; under the cooperation of the raised erasing block, the fluorescent agent on the surface of the generator retaining ring is erased and the fluorescent agent in the corrosion pit on the inner surface is retained, and after the work is finished, a detector can clearly observe the position and corrosion condition of the corrosion pit through the fluorescent agent, so that the detection effect is effectively improved, and the detection efficiency is improved. The problem that detection personnel cannot easily observe the condition of the corrosion pit is solved.

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.

The invention provides a rotating electromagnetic field structure surface corrosion defect three-dimensional reconstruction method. The method comprises the following steps: firstly, establishing a rotating electromagnetic field structure surface corrosion defect magnetic field image sample library through simulation and experiments; then, a structure surface corrosion defect three-dimensional reconstruction network is constructed, the network structure adopts Pix2Pix, and a loss function adopts the combination of a data loss function and a physical loss function; thirdly, the established reconstruction network is trained, and an optimal solution is obtained; and finally deploying the trained network on a rotating electromagnetic field detection system. According to the method, firstly, an effective method is provided for three-dimensional reconstruction of the corrosion defects on the surface of the structure; moreover, as a large number of samples are difficult to obtain for the real structure surface corrosion defect and the manufacturing is expensive, the precise reconstruction of the three-dimensional contour of the structure surface corrosion defect under the small sample is realized by adopting a physical and data dual-drive mode, and reliable data support is provided for safety assessment and maintenance decision of the structure.

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 relates to a painted structure corrosion nondestructive testing method and a painted structure maintenance evaluation method.The painted structure corrosion nondestructive testing method comprises the steps that the crawling track of a crawler is preset, after the crawler crawls one step every time, an ultrasonic probe scans in the direction perpendicular to the stepping direction, and after full-stroke scanning is completed, the crawler advances; after the crawl device crawl for one step, a local visual detection system on the crawl device photographs a to-be-scanned area of the ultrasonic probe to obtain a surface image of a local painted structure; in the moving process of the ultrasonic probe, an ultrasonic reflection signal is received; performing corrosion identification on the surface layer image of the local painted structure to obtain a surface corrosion image identification result; meanwhile, potential corrosion identification is conducted on the ultrasonic reflection signals, and a potential corrosion identification result is obtained; and fusing the surface corrosion image recognition result and the hidden corrosion recognition result to obtain a paint structure corrosion detection result. The method has the advantages that the corrosion condition of the painted structure is accurately evaluated, and the method is high in accuracy, easy to implement and the like.

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 belongs to the technical field of heat-engine plant unit circulation component surface corrosion prevention, and discloses a high-temperature-corrosion-resistant coating material, a coating and a preparation method and application thereof.The preparation method comprises the steps that by mass, 10%-20% of Cr, 1%-5% of Ni, 2%-10% of Fe, 10%-30% of molybdenum, 20%-40% of copper and 10%-20% of silicon are mixed to be uniform, a pipeline is embedded, heat treatment is conducted, and an initial chromium-rich infiltrated layer is formed; and then nitriding treatment is conducted on the initial chromium-rich nitriding layer, and the high-temperature-corrosion-resistant chromium-nitrogen composite coating is formed. The added silicon can form silicides in the coating, and the silicides can prevent the corrosion medium from permeating, so that the corrosion process is slowed down or prevented; the added molybdenum can effectively improve the stability of the composite coating in a corrosion medium rich in sulfate ions; and the added copper can form a protective layer consisting of copper sulfide or copper oxide on the surface of the steel, so that the corrosion of a corrosive medium is effectively prevented.

The embodiment of the utility model relates to the technical field of silicon core processing, in particular to a square silicon core support of an automatic cleaning machine, which comprises a support body, a tooth-shaped support is arranged on the support body, a plurality of fixing teeth with upward openings are arranged on the tooth-shaped support at intervals along the length direction, and the openings of the fixing teeth are used for placing silicon cores. The opening angle of the fixing teeth is smaller than 90 degrees, the angle of the fixing teeth is smaller than 90 degrees, the silicon core can be supported in a suspended mode, contact between the silicon core and the support is reduced, corrosion of acid liquor to the surface of the silicon core is more uniform and thorough, and surface impurities are better removed.

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 belongs to the technical field of preparation of copper foils for the electronic industry, and particularly relates to a method for improving the surface corrosion resistance of a copper foil by adopting a 2-mercaptobenzothiazole-cerium composite corrosion inhibitor. The preparation method comprises the following steps: preparing 2-mercaptobenzothiazole; preparing a cerium nitrate solution; preparation of the 2-mercaptobenzothiazole-cerium compound type corrosion inhibitor is carried out; preparing an electro-deposition copper foil; and carrying out corrosion inhibition treatment on the copper foil. According to the method for improving the corrosion resistance of the surface of the copper foil by adopting the 2-mercaptobenzothiazole-cerium composite corrosion inhibitor, the corrosion resistance of the copper foil can be remarkably improved through MBT-Ce corrosion resistance treatment and passivation treatment, so that the service life of the copper foil in a severe environment is prolonged; meanwhile, the surface quality of the copper foil is improved, so that the copper foil is smoother, and subsequent processing and application are facilitated; in addition, the anti-stripping strength value can be improved, so that the adhesive is more durable in the use process; and finally, production efficiency is improved, production cost is reduced, and large-scale production is facilitated.

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.