151 results about "Localised corrosion" patented technology

The invention relates to the technical field of equipment fault prediction, in particular to a coal mine equipment fault prediction system and method based on big data, and the method comprises the following steps: collecting the thickness of a biological membrane on the surface of equipment, synchronously collecting the vibration acceleration of the equipment and the environmental hydrogen sulfide concentration, and constructing a corrosion multi-mode data set; performing electrochemical noise separation on the corrosion multi-modal data set, and constructing a corrosion activity fingerprint spectrum; decoupling a coupling effect of mechanical vibration and microbial corrosion, and generating a corrosion-fatigue damage correlation map; and constructing a dual-channel life prediction model based on the corrosion-fatigue damage correlation map, and setting an early warning mechanism. Microbial corrosion characteristic current is accurately extracted through wavelet packet decomposition and wavelet entropy analysis, a corrosion-vibration heterogeneous graph is established by adopting a graph attention network, corrosion-induced structural vibration enhancement effect analysis is realized, and compared with a traditional prediction method based on a single signal, the method has the advantages that the method is simple and convenient to operate. And the problems of limited local corrosion influence range, unstable vibration response and the like are effectively solved.

The invention provides a high-temporal-spatial-resolution full-profile real-sea accurate corrosion test method and system, and the method comprises the steps: dividing the sea level into three layers of monitoring regions, namely an atmospheric near-sea-level layer, a sea-gas boundary layer and a seawater mixing layer, deploying corresponding sensor arrays in each monitoring region, and synchronously collecting the environmental parameters of each layer in real time; a standard corrosion coupon and a corrosion monitoring sensor for monitoring the local corrosion state of the sample are arranged in each monitoring area; performing space-time alignment on the acquired data to form an environment-corrosion strong association data set; an atmosphere-ocean coupling forecasting system is constructed, simulation and prediction of future environmental parameters are achieved, simulation results serve as input variables of a corrosion prediction model, and a material corrosion life prediction model is established in combination with historical test data. According to the invention, synchronous monitoring of multi-dimensional environmental parameters and material corrosion data within a range of 30 meters above and below the sea level can be realized, and an accurate basis is provided for material selection and corrosion prediction of marine equipment.

The invention provides a preparation method of a self-repairing waterborne polyurethane coating based on a synergistic effect of a dynamic disulfide bond and a pH response microcapsule. The preparation method comprises the following steps: step 1, preparing a dynamic disulfide bond-containing waterborne polyurethane (D-WPU) emulsion; step 2, preparing a pH response microcapsule; step 3, preparing a self-repairing waterborne polyurethane coating; a dynamic disulfide bond of the self-repairing waterborne polyurethane coating rapidly repairs macrocracks at 50-60 DEG C through mercaptan catalysis, and pH < lt > is caused by local corrosion of a pH response microcapsule; when the pH value is 4.0, cysteine is released, sulfydryl accelerates recombination of dynamic bonds, and amino enhances cohesive force of the coating and neutralizes H < + >. And in combination with a hydrogen bond network of the nanocellulose, the coating has low-temperature repair (the mechanical strength recovery rate is greater than or equal to 90%), high toughness (the water absorption rate is less than or equal to 2.1%) and long-acting corrosion resistance (the salt spray resistance life is greater than or equal to 600 hours), and is suitable for severe environments such as ocean engineering and new energy equipment.

The invention relates to the technical field of material corrosion and protection, discloses a TP2 copper corrosion behavior testing method based on temperature regulation and control, and aims to solve the problem that in the prior art, various physical and chemical parameters in the corrosion process are difficult to synchronously obtain under the same microscale, so that a local corrosion dynamics mechanism cannot be deeply revealed. The core of the system is a coaxial three-function composite probe integrated with thermal, acoustic and electrochemical sensing units, and the coaxial three-function composite probe is matched with a synchronous laser heating module and a multi-physical field synchronous control system. During testing, the probe scans on the surface of a sample, local thermal disturbance is applied to each pixel point, and the interface temperature, acoustic impedance and corrosion rate data of the point are synchronously collected. According to the invention, through high integration in structure and accurate synchronization in time, the space mismatch error of multi-source measurement is eradicated, and multi-physical field distribution images which are accurately corresponding to each other can be obtained in situ and losslessly.

The invention discloses a high-corrosion-resistance magnesium alloy and a preparation method and application thereof, and belongs to the technical field of magnesium alloys, the high-corrosion-resistance magnesium alloy is based on multi-element rare earth microalloying and dispersed Mg17Al12 phase synergistic regulation, in the high-corrosion-resistance magnesium alloy, a fine dispersed Mg17Al12 second phase is evenly distributed in a whole magnesium matrix, and the high-corrosion-resistance magnesium alloy has the advantages that the high-corrosion-resistance magnesium alloy is obtained; the magnesium alloy has the beneficial effects that the magnesium alloy is good in corrosion resistance, uniform corrosion of a magnesium matrix is promoted, and the micro-galvanic corrosion effect between the Mg17Al12 phase and the magnesium matrix is greatly weakened, so that serious local corrosion of the magnesium alloy in a traditional AZ91 alloy is converted into a uniform corrosion behavior, and the corrosion resistance of the magnesium alloy is greatly improved.

The invention relates to the technical field of alloy processing, and discloses a high-performance corrosion-resistant nickel-based alloy plate and a preparation method thereof, and the method comprises the following steps: raw material preparation, smelting treatment, casting treatment, hot rolling treatment, solution treatment, aging treatment and surface passivation treatment. According to the invention, when a composite acid system is adopted for passivation treatment, the concentration of chromium / molybdenum atoms in a passivation film is optimized and balanced due to the specific ratio of nitric acid to chromic acid, a chromium oxide provides a compact passivation barrier, and a molybdenum oxide endows the film layer with a self-repairing characteristic to synergistically inhibit pitting nucleation; meanwhile, nano titanium dioxide particles pretreated by silane are embedded into the passivation film in situ under the action of ultrasonic oscillation, organic pollutants adsorbed on a film layer can be decomposed by the photocatalytic characteristic of the nano titanium dioxide particles, the local corrosion effect of a battery caused by dirt coverage is avoided, and the performance of the battery is improved through double upgrading of components and the structure of the passivation film. And the alloy plate has excellent pitting corrosion resistance and fouling resistance in a chloride ion-containing medium.

The invention discloses a real-time monitoring method for local corrosion of a copper base material based on a discrete FBG sensor, and belongs to the technical field of metal corrosion monitoring. FBG strain sensors and temperature compensation sensors are distributed on the surface of the copper base material, and a temperature compensation mechanism is matched to eliminate measurement errors caused by environment temperature changes, so that the real-time monitoring of local corrosion of the copper base material is realized. Bragg wavelength drift caused by corrosion product accumulation in the corrosion process is collected in real time, and then real-time and continuous tracking of the corrosion dynamic process is obtained. The method realizes early recognition, accurate positioning and quantitative evaluation of local corrosion of the copper base material, has the advantages of non-destructiveness, high sensitivity, long-term stability and the like, and is suitable for corrosion health monitoring of copper structures such as ocean engineering, buildings, pipelines and the like.

This disclosure relates to the monitoring and detection of corrosion and / or erosion of pipes, vessels, and other components in an industrial facility. The monitoring system may comprise of an arrangement of guided wave (GW) transducers and a longitudinal wave (LW) transducer affixed to the piping component to collectively measure for localized corrosion of the piping component without necessarily requiring a thickness map. The monitoring system may use an intelligent amplified multiplexer / switch to control the operation of the transducers that may be controlled and operated to generate waves in the kilohertz range and megahertz range with the same hardware.

The invention relates to an experimental monitoring device for simulating seabed oil and gas pipeline top and under-scale corrosion. The experimental monitoring device comprises a container, a cover body, a first temperature adjusting assembly, a second temperature adjusting assembly, a gas assembly, a first detection unit and a second detection unit. Wherein the cover body is provided with a contact surface, and the contact surface forms an upper sealing surface of the container. The first temperature adjusting assembly is used for adjusting the temperature of the cover body, and the second temperature adjusting assembly is used for adjusting the temperature of the container. The first detection unit is arranged on the contact surface and used for detecting the corrosion condition of the contact surface. The second detection unit is arranged at the bottom of the container and used for detecting the corrosion condition of the bottom of the container. The actual operation conditions of the marine oil and gas pipeline in different environments can be simulated through the first temperature adjusting assembly and the second temperature adjusting assembly, the local corrosion conditions of top corrosion and under-scale corrosion can be continuously monitored through the tow electrodes at the top end and the bottom of the container, corrosion information is fed back in real time, and early warning and evaluation are facilitated.

The invention discloses a steel structural member local corrosion intelligent identification and evaluation method based on deep learning, and the method comprises the steps: obtaining a steel structure surface image through an imaging device, carrying out the feature extraction and corrosion region identification of an input image through a YOLOv12 semantic segmentation model which introduces a CBAM self-attention mechanism, and generating a pixel-level corrosion mask; the actual physical area of the corrosion area is automatically calculated based on an area calculation algorithm of conversion of mask integration and ground sampling distance; the residual bearing performance of the corroded component is evaluated in combination with the corrosion area ratio and the morphological characteristic prediction model; and finally realizing visual display and report output of detection results, area data and performance indexes through a graphical interface. According to the invention, full-process automatic processing of local corrosion of the steel structural member from detection, segmentation, quantitative measurement and calculation to member performance evaluation is realized, and closed-loop intelligent evaluation from visual detection to mechanical evaluation is realized.

The invention discloses a corrosion-resistant wrought aluminum alloy containing rare earth and a preparation method of the corrosion-resistant wrought aluminum alloy. The corrosion-resistant wrought aluminum alloy comprises, by mass, 0.05%-0.30% of Fe, 0.05%-0.25% of Si, 0.80%-1.6% of Mn, 0.01%-0.20% of Cr, 0.01%-0.30% of Ti, 0.05%-0.35% of rare earth and the balance Al and impurity elements, and the sum of the mass percentage of the impurity elements is not larger than 0.20%. By adjusting the element types and proportions of the aluminum alloy and adopting the rare earth composite refiner, matrix grain refinement and intermetallic compound modification of the aluminum alloy are achieved, the stability of a surface passivation film is improved, the local corrosion tendency is reduced, and the corrosion resistance is improved; and the maximum corrosion depth is 180 [mu] m or less after exposure for 21 days under a circulating acidic seawater salt spray test of ASTM G85 standards.

The invention relates to the field of solar cell manufacturing, and particularly discloses a polishing additive for solving the black core problem in the BC cell pre-rough polishing process and a use method of the polishing additive. 0.1-5% of a defoaming agent; 0.1 to 0.5 percent of pH (Potential of Hydrogen) regulator; and the balance of deionized water. According to the method, the accelerant, the defoaming agent and the pH regulator in a specific ratio are combined, so that the oxidation reaction on the surface of the silicon wafer is more uniform and controllable; the accelerant accelerates formation and dissolution of a surface oxide layer, and generation of black cores is effectively avoided; the synergistic effect of the defoaming agent ensures that bubbles generated by the reaction can be quickly desorbed, the problem of uneven local corrosion caused by bubble retention is prevented, the surface of the polished silicon wafer is completely free of black nuclei, and ideal surface conditions are provided for subsequent processes.

The invention relates to the technical field of detection, in particular to a valve quality detection method and system. According to the method, a valve is divided into sub-blocks, ultrasonic thickness, eddy current pitting corrosion signals, temperature, pH value, Cl <-> concentration and other environmental parameters are synchronously collected, a comprehensive corrosion coefficient is generated through a formula, a laser displacement meter is used for conducting three-dimensional scanning on a valve rod to obtain crack point cloud data, the volume density is calculated, and a health index is generated through fusion for decision making. The system comprises a multi-mode sensor, an active scanning module, a data analysis module and a decision output module, and the detection precision is improved through an anti-shake mechanism and a transfer learning model. According to the method, the problems of insufficient local corrosion capture, crack depth deficiency, complex structure shielding leak detection and the like in traditional detection are solved, accurate evaluation of the health state of the valve is realized, a scientific basis is provided for predictive maintenance of valves in petrochemical engineering, electric power and other industries, and the risks of production shutdown and equipment damage are effectively reduced.

The invention belongs to the technical field of material performance monitoring, and particularly relates to a sensor and a method for monitoring the corrosion behavior of metal in chloride molten salt, and the sensor and the method are used for monitoring the corrosion characteristics of the metal in a chloride molten salt environment for solar photo-thermal power generation. The corrosion rate and corrosion behavior are monitored in multiple dimensions, data are mutually verified, the reliability of the result is ensured, the temperature control module is cooled through real-time air, it is ensured that the temperature of the probe head is consistent with the actual working condition temperature, and the monitoring accuracy is further improved. In addition, the electrochemical noise signal fluctuation characteristics can help to preliminarily distinguish local corrosion and uniform corrosion behaviors, and deep analysis of the corrosion behaviors is realized. The method can also be widely used for corrosion monitoring and early warning of a photo-thermal power station using various heat storage media except chloride molten salt, and solving the problem of molten salt corrosion has indispensable strategic significance for guaranteeing the equipment stability, reducing the operation cost and improving the international competitiveness.

The invention provides a calculation method for predicting the adsorption tendency of chloride ions on a heterogeneous interface in steel based on a first principle, which comprises the following steps: calculating the mismatch degree of the heterogeneous interface, and carrying out surface energy convergence test on two-phase surfaces; the adhesion work and the interface energy of the heterogeneous interface models in different joint modes are calculated; carrying out convergence test on the interface spacing on the heterogeneous interface model; selecting an adsorption position with the lowest two-phase surface adsorption energy as a potential adsorption position on the heterogeneous interface; and judging the adsorption tendency of the chloride ions on the heterogeneous interface. According to the calculation method for predicting the adsorption tendency of the chloride ions on the heterogeneous interface in the steel based on the first principle, by simulating the adsorption behavior of the chloride ions on the heterogeneous interface, how the microstructures affect the starting and development of local corrosion can be deeply understood.

The present application relates to the field of electromagnetic nondestructive testing, and particularly to a zooming pipeline nondestructive flaw detector and a method for detecting flaws of a metal wall surface with a coating layer. The flaw detector comprises a probe, an excitation source, a signal receiver and a controller. In the probe, each excitation coil and detection coil is connected to a support through an independent movable joint. The movable joint is used to adjust the orientation of the excitation coil or the detection coil. The excitation source is electrically connected to each excitation coil and is used to output an excitation signal to the excitation coil. The signal receiver is electrically connected to the detection coil and is used to obtain an induced signal of the detection coil. The controller adjusts the posture of the movable joint according to the coating layer thickness, the outer diameter and the wall thickness of the pipeline to be detected, so that the orientations of each excitation coil and detection coil intersect at the defect position of the pipeline wall surface to be detected, thereby enhancing the received induced signal. The present application solves the technical problem that the existing pulsed eddy current detection technology cannot meet the detection requirements of local corrosion defects of pipelines and containers with a coating layer.

The invention belongs to the technical field of coal mine machinery lubrication and hydraulic transmission, and discloses an environment-friendly total-synthesis concentrated solution for a hydraulic support and a preparation method of the concentrated solution. The biological sensing microcapsule corrosion inhibitor is characterized by comprising 0.5%-3.0% of a biological sensing microcapsule, 8.0%-15.0% of a main corrosion inhibitor, 2.0%-6.0% of an auxiliary corrosion inhibitor, 4.0%-10.0% of a water-soluble lubricant, 0.05%-0.2% of an anti-foaming agent, 1.0%-3.0% of a pH buffering agent and deionized water. Wherein the biological sensing microcapsule has a core-shell-shell structure, is integrated with electroactive microorganisms, an electron mediator carrier and a corrosion inhibition precursor release layer, and can trigger targeted release of benzotriazole derivatives when the pH value of a local corrosion microarea is less than or equal to 5.5. The corrosion inhibitor has excellent corrosion protection performance and environment-friendly characteristics, effectively overcomes the problem of inactivation of microorganisms under severe hydraulic working conditions through a microcapsule encapsulation strategy, realizes accurate matching of corrosion signal in-situ sensing and corrosion inhibition response, remarkably improves the anti-rust performance under high-shear and wide-temperature-range working conditions, and has wide application prospects. And meanwhile, the requirements of environmental protection and sealing material compatibility are met.

The application discloses a production method of wood material surface metallic paint and belongs to the technical field of wood paint. The production method of the wood material surface metallic paint is characterized in that the scale-shaped metallic powder pigment is arranged in a multi-layer ordered superposition mode, a barrier layer is provided for corrosive medium, shrinkage residual stress is improved to avoid corrosion, the strength of the paint film is improved, the hardness of the paint film is high after solidification, the paint film is resistant to scratching, the vinyl ester resin and the polyurethane powder are mixed to improve the toughness of the paint film, the metallic powder is uniformly dispersed through the polyurethane powder, the defects caused by uneven dispersion such as color difference and local corrosion are reduced, the wood material can be applied to various wood materials such as solid wood, shaving board and fiber board, and the wood material can exhibit a luxurious and gorgeous visual effect, in addition, the wood material has excellent physical and mechanical properties, chemical resistance and weather resistance and the like, and is suitable for the surface treatment of various wood, shaving board and fiber board and can enhance the gloss, brightness and depth of the wood.

The application discloses a kind of corrosion-resistant magnesium alloy with self-repair protection and preparation method thereof, it is related to magnesium alloy technical field, the mass percentage content of each component of the corrosion-resistant magnesium alloy includes: Al: 6-15%;Mn: 0.01-0.3%;Y: 0.1-2%;Cd: 0-0.1%;Be: 0-0.1%;The rest is Mg and unavoidable impurities.By adding trace alloying elements to control the organization, with the help of dense passivation oxide film formed on the surface of alloy matrix, to inhibit the corrosion failure problem caused by the damage of matrix surface film layer to pitting or surface corrosion, under long time neutral salt solution environment, when local corrosion occurs on the surface of magnesium alloy matrix, the protection of autogenous passivation film can prevent the corrosion medium from continuing to expand to the inside of matrix, and the formation of multiphase in the organization is avoided as much as possible, and the number of primary cell is reduced, so as to reduce electrochemical corrosion.

The invention discloses a chloride ion concentration driven corrosion evolution probability type cellular automaton simulation method, and relates to the field of metal corrosion evolution simulation, and the method comprises the following steps: S1, setting a cellular space size and a cellular size, and constructing a three-dimensional cellular space; s2, cell types are defined, and initial distribution of various types of cells is completed in a three-dimensional cell space; s3, setting a reaction mechanism of a model iteration process, and judging a conversion rule among various types of cells according to a corrosion probability Pa, a passivation probability Pb and a passivation film fracture probability Pd; s4, a chloride ion concentration matrix, a probability enhancement coefficient and an attenuation coefficient are introduced, the cellular transformation probability in the iteration process is corrected through the real-time concentration value of chloride ions, and aggravation of the local corrosion process is achieved; and S5, comparing test and simulated corrosion morphology results under the same mass loss rate. According to the method, local corrosion difference can be effectively reduced on the basis of comprehensive corrosion, and support is provided for durability evaluation of the steel structure.

The invention relates to a grounding grid state detection method and device, computer equipment and a readable storage medium. The method comprises the steps of obtaining grounding resistance information of a grounding grid; detecting a first state evaluation result of the grounding grid according to the grounding resistance information; when the first state evaluation result represents that the grounding grid is in an abnormal state, performing local corrosion fracture evaluation on the grounding grid to obtain a second state evaluation result; and detecting the target state of the grounding grid according to the first state evaluation result and the second state evaluation result. By adopting the method, the state of the grounding grid can be accurately evaluated.

The invention provides an in-situ monitoring method and system for monitoring the corrosion behavior of a weathering resistant steel welded joint, and relates to the technical field of corrosion monitoring. An electrochemical impedance measurement value of a monitoring area is collected and serves as a boundary condition to be input into a pre-established electric field distribution model for solving, and the corrosion behavior of the weathering resistant steel welded joint is monitored. Therefore, a two-dimensional conductivity distribution is obtained in each monitoring period and a conductivity map is generated. A first conductivity map sequence is formed by repeating the process, and key components with the conductivity changing along with time are analyzed and extracted. And reconstructing a conductivity background in an uncorroded state based on the key components, and deducting the background from the first sequence to obtain a second conductivity map sequence representing conductivity change caused by local corrosion. And when the conductivity variable quantity in the second sequence exceeds a preset threshold value, judging that the monitoring area is corroded, and determining the corrosion position, outline and stage. According to the method, accurate positioning, form recognition and stage judgment of the corrosion behavior of the weathering resistant steel welded joint can be achieved.

This invention discloses a numerical simulation method for the corrosion rate of high-strength steel under marine stress environments, belonging to the field of corrosion and protection technology. The method includes the following steps: establishing a geometric model for simulation and meshing the model; setting material properties, including corrosion kinetic parameters and basic mechanical property parameters; applying boundary conditions to the geometric model to simulate the actual stress state of the high-strength steel plate; formulating a kinetic expression formula for the electrochemical reaction to describe the electrochemical behavior during corrosion; and performing a corrosion kinetic-mechanical coupling analysis to calculate the distribution of corrosion current, corrosion potential, and local corrosion rate. This invention, by constructing a multiphysics model, can accurately extrapolate and predict the dynamic corrosion rate of high-strength steel under different stresses and environmental parameters. It provides crucial theoretical basis and data support for the design, life assessment, and maintenance decisions of marine engineering structures.

The invention relates to the field of cross arm hoops, and provides a corrosion-resistant hoop and a preparation method thereof. The corrosion-resistant hoop is prepared from the following components in percentage by weight: 0.35 percent to 0.45 percent of C, 0.4 percent to 0.6 percent of Si, 1.8 percent to 2.5 percent of Mn, 1.2 percent to 1.8 percent of Cr, 0.8 percent to 1.2 percent of Ni, 0.25 percent to 0.35 percent of Mo, 0.11 percent to 0.23 percent of composite rare earth, 0.15 percent to 0.25 percent of V, 0.03 percent to 0.07 percent of Nb, 0.003 percent to 0.008 percent of Al, 0.02 percent to 0.04 percent of B, 0.015 percent to 0.03 percent of N and the balance of Fe and other inevitable impurities. According to the corrosion-resistant hoop provided by the invention, the local corrosion resistance of the hoop in a complex environment is improved, the problems of mechanical property reduction and fracture risk are improved, and safe operation of an electric power circuit is guaranteed.

The application discloses a kind of chloride ion concentration driven corrosion evolution probability type cellular automaton simulation method, it is related to metal corrosion evolution simulation field, including the following steps: S1: setting cell space size and cell size, construct three-dimensional cell space;S2: definition cell type and in three-dimensional cell space complete the initial distribution of each type cell;S3: set the reaction mechanism of model iteration process, to corrosion probability P a , passivation probability P b , passivation film rupture probability P d Determine the conversion rule between each type of cell;S4: introduce chloride ion concentration matrix and probability enhancement coefficient, attenuation coefficient, by the real-time concentration value of chloride ion to the cell conversion probability in iteration process is modified, realize the aggravation of local corrosion process;S5: compare the corrosion morphology results of test and simulation under the same mass loss rate.This application can effectively reduce the difference of local corrosion on the basis of general corrosion, provide support for steel structure durability evaluation.

The utility model relates to the technical field of industrial pipeline welding, and discloses a steel flue gas pipeline rapid repairing device which comprises a fixing frame, a threaded rod is rotatably connected to the interior of the fixing frame, and a first sliding block is connected to the exterior of the threaded rod in a threaded mode. A threaded rod drives a cutting disc and an arc-shaped clamping plate to move at the same time, a second motor drives the arc-shaped clamping plate to conduct clamping, opening and closing, an original pipeline is supported to reduce the gravity, an electric telescopic rod drives a cutting mechanism to conduct synchronous pushing cutting, and therefore clamping and cutting are conducted synchronously, the linkage effect is formed, and the corrosion part cleaning efficiency is improved. And then steel pipes with the original diameter or larger than the original diameter and made of the same material or steel pipes with the diameter higher than the original diameter are machined and welded, and the steel pipes are normally used after being inspected, so that rapid repair of the steel product smoke exhaust pipe after local corrosion is achieved, cost can be saved, overall replacement is not needed, downtime is shortened, and production cost is reduced.

The present invention discloses a buried pipeline stray current anode transient interference corrosion monitoring device and a testing method, relating to the technical field of stray current interference corrosion monitoring. The device comprises an experimental box, an experimental medium, a transient interference system and an interference testing system. The transient interference system comprises a constant potential instrument, a switching controller, a metal electrode bundle, an auxiliary electrode group and a reference electrode. The output value and output cycle of the constant potential instrument are adjusted to simulate the interference intensity and interference frequency of cathodic protection and stray current. The buried pipeline stray current anode transient interference corrosion monitoring device and the testing method of the present invention utilize a metal electrode bundle to realize the monitoring and evaluation function of the transient corrosion effect of the anode transient interference on the pipeline. The current distribution on the surface of each metal electrode is scanned by program control to characterize the local corrosion characteristics of the pipeline. The method is more comprehensive and systematic than traditional testing methods, and the data obtained is more valuable for reference.

The invention belongs to the technical field of microstructure simulation, and provides a method for simulating a local corrosion process of an Al-Cu-Li alloy laser welding joint aiming at the problem that a traditional CA model has defects in simulation of microscopic grain structure characteristics, the CA model is reconstructed on the basis of a Voronoi diagram method and test characterization data, and the local corrosion process of the Al-Cu-Li alloy laser welding joint is simulated. An intermetallic compound is introduced into a model for the first time, a three-dimensional CA model containing seven types of cells and five evolution rules is systematically constructed, and reproduction of local corrosion processes such as grain boundary preferential dissolution and corrosion channel expansion of a fusion region in an acid environment is achieved. Optimization design is carried out on model parameters based on a deep learning training algorithm, and the optimized model well reflects the actual intergranular corrosion morphology of the fusion zone.

The present invention provides a method for detecting corrosion defects of buried oil and gas steel pipelines, and relates to the technical field of pipeline detection. A method for detecting corrosion defects of buried oil and gas steel pipelines includes pre-detection preparation, magnetic field loading and data collection, data analysis and processing, and result evaluation and report generation. It can timely detect corrosion defects, prevent fires, explosions and other safety accidents caused by oil and gas leakage, and protect the lives, property and environment of residents; detect potential dangerous defects such as stress corrosion cracks in advance, prevent crack expansion from causing sudden breakage of pipelines, and ensure the integrity and stability of the pipeline operation structure; accurately locate and evaluate corrosion defects, facilitate timely repair and maintenance, such as replacing or repairing severely corroded local pipe sections, preventing corrosion from further deteriorating, and extending the overall service life of the pipeline; combine regular detection with scientific maintenance to keep the pipeline in good operating condition, reduce pipe wall thinning, maintain the pipeline's load-bearing and transportation capacity, and give full play to its economic value.

The invention relates to a self-repairing anticorrosive coating, a preparation method thereof, a photovoltaic module and a frame thereof. According to the self-repairing anticorrosive paint and the preparation method thereof, a specific amount of the solvent, the repairing agent nanometer container and the curing agent are added into the film-forming resin, the repairing agent is a heterocyclic compound capable of being subjected to coordination reaction with metal ions, heteroatoms of the heterocyclic compound comprise at least one of N, S and O, the nanometer container serves as a carrier of the repairing agent, and the curing agent is a curing agent. When corrosive media such as water molecules permeate into the surface of the frame to cause local corrosion, the repairing agent diffuses out of the nanometer container at the invasion position of the corrosive media and is subjected to coordination reaction with metal ions generated by corrosion reaction to form a new local protection film, and further diffusion of corrosion is limited. In addition, migration of metal ions can be well limited through the coordination effect, and then the effect of controlling PID effect deterioration is achieved. Therefore, the stability and the long-term effect of the frame and the assembly in severe environments such as high humidity and high salt can be improved.