22 results about "Localised corrosion" patented technology

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 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.

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 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.

This invention discloses a method for predicting the severity of localized corrosion environments based on the surrounding environment. The method includes: constructing a semi-closed simulation test system to simulate the internal local environment of equipment; conducting accelerated corrosion tests under different external environmental conditions, collecting external environmental parameters, internal local environmental parameters, and corrosion response data of metal samples; constructing a time-series feature matrix from the external environmental parameters; calculating a comprehensive corrosion risk index based on the corrosion response data; constructing and training a correlation prediction model from the time-series feature matrix to the comprehensive corrosion risk index using an attention mechanism long short-term memory network; collecting external environmental parameters in real time and inputting them into the trained correlation prediction model; and outputting a predicted value for the severity of localized corrosion environments at the target location of the equipment. This invention enables accurate and rapid assessment of internal corrosion risk based solely on externally measurable data, solving the problem of difficulty in directly monitoring the internal or localized corrosion environment of equipment.

The application discloses a kind of anticorrosive and anti-seepage inner lining four fluorine storage tank, it is related to four fluorine storage tank technical field including: tank body, two sides surface of tank body is provided with two pull handle, and the both ends of tank body are provided with one connecting port respectively, and the inside of tank body is provided with inner lining cylinder, and inner cylinder mechanism includes: inner tank, and inner tank is located in the inside of tank body, and the both ends of inner tank are provided with one side tank cover respectively, and inner lining cylinder is located in the inside of inner tank, and drive assembly includes: drive box, and drive box is fixedly installed on the upper surface of tank body, and the inside of drive box is provided with drive motor, and the bottom surface of drive motor is fixedly connected with the upper surface of tank body, and detection mechanism includes: multiple elastic trigger ropes, and elastic trigger rope is located in the inside of inner lining cylinder, in the scheme, by being provided with inner cylinder mechanism and detection mechanism, effectively prevent the tank body rupture or leakage caused by excessive corrosion, avoid the overall failure caused by local corrosion too fast, to prolong the overall service life of tank body.

The application discloses a kind of weather-resistant sealing strip structure's modeling simulation method and system, comprising: the initial three-dimensional grid model of the sealing strip to be analyzed is constructed and is given initial material attribute, sequentially applied to model precipitation simulation working condition and dry environment simulation working condition, extract the surface microcrack node in open state and input to local corrosion evolution prediction model to output local corrosion degradation coefficient, after replacing initial corrosion rate parameter, Markov model for surface microcrack node is constructed and degradation coefficient is converted into state transition probability matrix, subsequently, the grid cell degradation state is calculated by Markov model, the surface microcrack node corresponding to the grid cell that occurs perforation failure is marked as high-risk perforation node.The application solves the problem that the prior art cannot effectively simulate and accurately predict the in-situ local punctiform perforation failure caused by microcrack water evaporation concentration.

The application provides a wind power blade and a wind power generation device. The wind power blade comprises an outer shell; the outer shell has a suction surface and a pressure surface; a leading edge of the outer shell is provided as a wave-shaped bionic structure, the wave-shaped bionic structure comprises convex parts and concave parts which are alternately arranged along a span direction of the outer shell, wherein an outer surface of the convex part is provided with a hydrophobic texture, and an outer surface of the concave part is provided with a flow guide microstructure configured to regulate a flow direction of liquid on the outer surface of the concave part. By arranging the wave-shaped bionic structure at the leading edge of the outer shell, stall can be delayed, and aerodynamic performance under a large angle of attack can be improved. By arranging the hydrophobic texture on the outer surface of the convex part of the wave-shaped bionic structure, efficient hydrophobic anti-icing can be realized. By arranging the flow guide microstructure on the outer surface of the concave part of the wave-shaped bionic structure, rapid discharge of the gathered liquid can be realized, and the possibility of local corrosion can be reduced.

The present application relates to the technical field of industrial boiler safety monitoring, and discloses a boiler four-tube corrosion risk intelligent evaluation system based on dissolved hydrogen monitoring and an evaluation method thereof, wherein the method comprises: obtaining historical operation parameters of a boiler unit, unit structure data and real-time dissolved hydrogen concentration of a feedwater and main steam system; predicting a theoretical background hydrogen concentration by using a baseline prediction model, and calculating an actual corrosion hydrogen production concentration by combining a measured concentration difference, so as to remove background interference; inputting a mass transfer conversion inversion model to calculate a boiler four-tube overall corrosion rate; constructing a discretized spatial topology graph model, and taking thermal field characteristics as tube segment node attributes; calculating spatial distribution weights by using a graph attention mechanism, distributing the overall corrosion rate to each node to obtain a local corrosion risk index, and generating a dynamic early warning strategy. The present application overcomes the background hydrogen interference and spatial positioning problems, and realizes accurate tracing and early warning of corrosion risk.

This application relates to the field of pipeline risk assessment technology, and discloses a method and system for dynamic assessment of corrosion risk in multi-media transport pipelines. The method includes: real-time acquisition of data on the fluctuation range of acidity / alkalinity and flow velocity distribution of the medium at different locations within the pipeline to obtain an operational status set; time-series analysis and dynamic change pattern extraction of the operational status set to map and determine the distribution of localized corrosion-sensitive areas; construction of a corrosion influence feature matrix based on this matrix, generating a priority ranking by weighting coefficients updated over time and the correlation strength of factors, and comparing it with weight thresholds to extract high-impact feature subsets or update the matrix; dynamically adjusting the contribution ratio of each factor to calculate a preliminary quantitative value of corrosion risk for each sensitive area; and correction using historical corrosion rate records to obtain the final assessment result of localized corrosion risk in the pipeline. This method can achieve real-time quantification and dynamic correction of localized corrosion risk under complex operating conditions, improving the intelligence level of pipeline safety management and maintenance decision-making.

The application discloses a preparation method and application of a metal organic framework composite coating of active molecules loaded on a zinc alloy surface, and belongs to the technical field of biomedically degradable metal materials. The preparation method of the organic metal framework composite coating comprises the following steps: S1, preparing a ZnO nanostructure transition layer; S2, in-situ generating a metal organic framework coating induced by 2,5-dihydroxyterephthalic acid; and S3, preparing a metal organic framework composite coating loaded with deferoxamine. The application can effectively slow down the degradation rate of a zinc alloy substrate containing Mg, Ca and Sr, and makes the zinc alloy substrate containing Mg, Ca and Sr free of local corrosion, so that no toxicity is caused to cells and tissues around an implantation site. Slow release of the loaded deferoxamine can significantly accelerate blood supply reconstruction at a fracture / bone defect site, and can balance osteogenesis and osteoclastogenesis. The application solves the problems of uncontrollable degradation and lack of regulation on local immune inflammation and osteogenesis-osteoclastogenesis balance.

This utility model relates to a steel pipe, including a hollow steel pipe body extending axially to the left and right, and a connector. The steel pipe body comprises a first steel pipe and a second steel pipe, with the connector located between the first and second steel pipes. One end of the connector is detachably connected to the first steel pipe, and the other end is detachably connected to the second steel pipe. The first and second steel pipes are of the same shape and size. This design provides a method for extending the service life of the entire stainless steel pipe by allowing for the replacement of the portion of the steel pipe at the site of localized corrosion.

This invention relates to the field of electromagnetic nondestructive testing, specifically a zoom-type pipeline nondestructive testing instrument and a method for detecting defects in coated metal walls. The instrument includes 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 via an independent movable joint; the movable joint is used to adjust the orientation of the excitation coil or detection coil. The excitation source is electrically connected to each excitation coil and outputs an excitation signal to it; the signal receiver is electrically connected to the detection coil and acquires the induced signal from the detection coil. The controller adjusts the orientation of the movable joints according to the coating thickness, outer diameter, and wall thickness of the pipeline under test, so that the orientation of each excitation coil and detection coil intersects at the defect location on the pipeline wall under test, thereby enhancing the received induced signal. This invention solves the technical problem that existing pulsed eddy current testing technology cannot meet the requirements for detecting localized corrosion defects in coated pipelines and containers.

The present application relates to the technical field of corrosion monitoring, and particularly relates to a marine wind power tower corrosion monitoring system based on multidimensional data, which comprises an acquisition module, a determination module, an identification module, a determination module, a warning module and an adjustment module. The present application takes the fast available image features such as rust layer coverage and color gradient as the first layer trigger signal according to the particularity of the dry-wet alternation and multi-mechanism coupling corrosion of the splash zone of the marine wind power tower, and activates the subsequent composite corrosion identification only when the corrosion is significant. At the same time, the composite corrosion index is constructed by the spatial aggregation degree and type distribution of the corrosion points, the local corrosion behavior is mapped to the risk quantization index of the tower drum level and the whole field level, and the preset threshold is closed-loop adjusted by using the historical warning accuracy and the corrosion event timing density, so that the problem of low corrosion detection accuracy caused by the dependence on fixed threshold and the inability to adapt to dynamic marine environment is effectively solved.

The application relates to a resistance probe for material corrosion monitoring, which comprises a shell and a reference electrode and a corrosion electrode arranged in series on the shell, the reference electrode is sealed in the shell by being isolated from the outside through a packaging medium, and the corrosion electrode is exposed outside the shell; the corrosion electrode is a continuous non-overlapping coiled curve line structure in one working plane of the shell; the application increases the length of the corrosion electrode through the "Omega" type design, so that the cross-sectional area of the electrode can be increased under the condition that the resistance change is the same, the failure resistance of the electrode to the damage caused by local corrosion of the probe is enhanced, the cross-sectional area of the corrosion electrode is increased, the measuring element is not affected by the machining process during the preparation process, the material surface state of the measuring element is different from the surface state of the monitored equipment, and therefore the health state of the equipment can be more accurately reflected.

This invention discloses a corrosion-resistant and recyclable tinplate food container and its preparation method, comprising a food can with a threaded post at the center of its top. A sealing cap is connected to the top of the threaded post via an internally threaded tube. A connecting ring is provided on one side wall of the sealing cap. The advantages are as follows: Through the design of the weld seam, electroplating layer, and passivation layer, after welding the joint, the weld seam can be electroplated using a tin salt electrolyte, filling any damage to the tin layer. Then, a secondary passivation process using a chromate passivation solution is performed on the weld seam to form a passivation layer, effectively connecting the weld seam to the original passivation layer and preventing localized corrosion at the weld seam. The design of the connecting ring, connecting ring 2, and carrying rope facilitates direct hand-carrying of the food can when carrying the device, preventing the loss of the sealing cap and facilitating efficient recycling of the tinplate.

The utility model relates to the field of corrosion test boxes, and discloses a zinc impregnation layer salt spray test box for a corrosion resistance test, which comprises a main body, and the main body comprises a control system, a heating system, a temperature control system and a spraying device which are arranged in the main body; a test room is formed in the main body; the test room penetrates through the top of the main body; a sealing plate is mounted at the top of the test room; the sample rack comprises four stand columns which are fixedly connected to the bottom wall of the test room; a transverse rod is arranged between the two stand columns located on the same side. According to the utility model, the plurality of supporting rods slide in the cross rod, so that the sample rack can be adjusted according to the specification and the size of a sample, the contact area between salt mist and the sample is increased, and the situation that the cross rod and the supporting rods with smaller gaps shield the surface and the bottom of the sample, so that the salt mist cannot be uniformly sprayed to the parts is avoided; therefore, the local corrosion degree of the sample is not consistent with the actual condition, and the evaluation of the overall corrosion resistance of the zinc impregnation layer is influenced.

The application discloses a kind of layer advantage seepage driving group anchor corrosion test device and test method, including shell, simulation rock mass, seepage system and observation system, simulation rock mass is set in shell, simulation rock mass is layered rock mass with anisotropy and interface effect, multiple anchor rods are arranged on it along vertical direction, simulation rock mass simulates slope structure, simulation rock mass and anchor rod on it together form simulation anchoring system, electrolyte system is used to form layer advantage seepage environment in simulation rock mass, to simulate in rock mass permeability, hydraulic gradient and pore structure lead to the intensification of local corrosion phenomenon caused by advantage seepage path.This design not only can simulate the intensification of local corrosion phenomenon caused by advantage seepage path, effectively improve the accuracy of corrosion test, and can truly reproduce the control effect of layered structure on seepage path and corrosion process, effectively improve the engineering representativeness of corrosion test.

The application discloses a kind of coating damage of earth storage tank metal matrix corrosion uneven degree characterization method, it is related to storage tank corrosion characterization technical field.The method includes the following steps: take several parameters completely consistent standard carbon steel sample, prepare identical protective coating on each sample surface, then open the same damaged area on each coating sample to expose internal metal matrix, finally obtain coating damage sample.The application establishes the corresponding relationship between theoretical uniform corrosion depth and measured maximum corrosion depth, proposes corrosion uneven coefficient, for quantifying the uneven degree of local corrosion of metal matrix;In addition, open-circuit potential and corrosion rate reach stable state as test termination basis, reasonably determine test duration, ensure that corrosion system is in steady state, and then reliably characterize the corrosion uneven characteristics of coating damage sample in soil environment system under long-term steady state.

The utility model relates to eddy current nondestructive testing technical field, concretely relates to a pulse eddy current detection device for steel double -layered jacket type pressure vessel, including scanning frame, the top of scanning frame is fixed with the handle, and the both ends of scanning frame are provided with fixed wheel group respectively, be provided with detection probe fixed support between two fixed wheel groups, and the end of detection probe fixed support is provided with detection probe casing, and the pulse eddy current detection probe of inverted '' V '' type is built -in in detection probe casing. The pulse eddy current detection device for steel double -layered jacket type pressure vessel of the utility model, through the magnetic field of inverted '' V '' type, can promote the detection sensitivity of inner tube local corrosion defect, and accurately identifies the corrosion thinning defect that appears in inner tube local.

This invention relates to a single-stage rubber diaphragm-sealed dry gas holder condensate collection and discharge device, comprising a condensate collection tank, drain pipes, and a support. The condensate collection tank consists of an inner ring collection tank and an outer ring collection tank. The inner ring collection tank is located directly below the outer edge of the piston base plate in the gas holder, and the outer ring collection tank is located directly below the rubber sealing diaphragm in the gas holder. Multiple drain pipes are arranged circumferentially along the condensate collection tank, and the bottoms of the inner and outer ring collection tanks are connected to the drain pipes. The drain pipes are arranged radially inclined along the gas holder, and their lower ends are connected to the bottom drainage device of the gas holder. The condensate collection tank is connected to the piston bottom support via the support. The device of this invention can automatically collect condensate dripping along the edge of the piston base plate and the sealing steel section, and guide it orderly into the bottom drainage system of the gas holder, thereby completely eliminating the problem of localized corrosion of the gas holder bottom plate caused by fixed-point dripping condensate. The device has a reasonable structure, is easy to install, and has good corrosion resistance.