62 results about "Corrosion behavior" patented technology

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 coating zirconium alloy fuel cladding tube corrosion test method, which comprises the following steps: providing a corrosion medium for simulating a pressurized water reactor primary loop water chemical environment, and arranging a coating-free contrast sample, the unit area corrosion rate of a zirconium alloy base material in a corrosion medium and the total mass change of a single-coating target sample in the corrosion medium are obtained by combining a weighing method, and microscopic parameters such as the thickness of a coating corrosion layer, the cross section content of key elements, spatial distribution and the like are measured so as to quantify the coating corrosion consumption; and deducting the base material corrosion mass change from the total mass change of the target sample according to the base material corrosion rate of the comparison sample, separating the coating corrosion mass change, and obtaining a coating corrosion evolution model in combination with the real coating corrosion rate calculated after microscopic parameter verification. The method breaks through the limitation that a traditional weighing method cannot split the independent corrosion behavior of the coating, and provides a basis for corrosion mechanism research, coating corrosion stage division, rate prediction and failure critical time judgment.

The present invention belongs to the field of material performance simulation. Specifically disclosed is a method for constructing a relationship between the non-soluble deposit density and the corrosion rate on the basis of finite element simulation. In the method of the present invention, by means of establishing a finite element model, constructing a relationship between the non-soluble deposit density and the porosity and performing simulation analysis on corrosion behaviors under different non-soluble deposit density conditions, a relationship between the non-soluble deposit density and the corrosion rate is constructed. The method of the present invention can effectively predict corrosion behaviors of a material under different non-soluble deposit density conditions, can provide a scientific basis for material protection design, and has wide application prospects.

The present application relates to the technical field of material performance testing, and discloses a material corrosion testing device and testing method for simulating ocean acidification environment, comprising: a closed simulation testing cabin, which is internally divided into a top-down salt mist simulation cabin, a wet heat simulation cabin and a high-pressure immersion simulation cabin by horizontally arranging openable and closable upper and lower insulation boards, and is provided with a cabin door with a sealing structure at the top; through the independent modular design of the salt mist simulation cabin, the wet heat simulation cabin and the high-pressure immersion simulation cabin, and the automatic switching function of the rotatable lifting sample holder, the present device realizes precise coupling and seamless switching of corrosion environments such as salt mist spraying, high temperature and high humidity, and deep sea high pressure, and the sample can complete the whole cycle corrosion behavior research of the marine atmospheric zone, the splash zone, the tidal zone and the full immersion zone on the same platform, and eliminates the interface effect caused by the traditional multiple equipment series connection testing.

The invention discloses a contact network positioning wire clamp coupling experiment device and an experiment method, relates to the technical field of contact network testing, and solves the technical problem that the actual clamping state of a positioning wire clamp cannot be well simulated due to the fact that the performance research of an existing positioning wire clamp mostly focuses on static mechanical properties or corrosion behaviors in a single environment. The device comprises a positioning wire clamp; two contact line fixing bases are arranged on the positioning substrate, and the two ends of the contact line are connected with the two contact line fixing bases respectively; the lower end of the upper clamping rod is connected with the upper end of the positioning wire clamp, and the upper end of the upper clamping rod is connected with a fatigue testing machine; the upper end of the lower clamping rod is detachably connected with the positioning base plate, and the lower end of the lower clamping rod is connected with a fatigue testing machine; the horizontal load applying module is arranged on the positioning substrate and is connected with the positioning wire clamp; the device has the advantages of being capable of accurately simulating the actual mechanical state of the positioning wire clamp and the like.

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.

The application discloses a kind of theoretical model for evaluating pipeline steel macro-battery corrosion under elastic-plastic deformation, the theoretical model includes following physical field and coupling mechanism thereof: physical field: (1) stress-strain field: the elastic-plastic mechanics constitutive model based on von Mises yield criterion and isotropic hardening criterion is used to characterize the mechanical behavior of pipeline steel;(2) electrochemical field: the electrode kinetics model based on Tafel equation is used to characterize the corrosion reaction kinetics process on the surface of pipeline steel;Coupling mechanism: the mechanical-electrochemical double-path coupling mechanism for characterizing macro-battery corrosion.The model realizes the quantitative description of the macro-battery corrosion behavior induced by elastic-plastic deformation by coupling the mechanical deformation and electrochemical corrosion process of the material.The application realizes the two-way interaction of stress-strain field and electrochemical field under the background of macro-battery corrosion, and can quantitatively reveal the regulation of deformation on the intensity and evolution process of macro-battery corrosion.

The invention relates to the technical field of corrosion tests and equipment, in particular to a tidal range natural acceleration device and a test method.Seawater liquid level changes are monitored in real time through a liquid level sensor, the natural rising tide frequency a and falling tide frequency b of the previous day are obtained, a sample frame is controlled to execute up-down reciprocating motion at N times of frequency, and N is the acceleration rate; and after a plurality of test periods, respectively measuring the corrosion rates of the accelerated test and the naturally exposed sample, calculating the acceleration ratio, and constructing a gray prediction model based on the relationship between the acceleration ratio and time for extrapolating and predicting the natural corrosion behavior of the material in a longer period. According to the invention, a mechanical lifting system capable of being accurately controlled is constructed in a natural seawater tidal range region, so that the frequency of a material drying and wetting alternation process is enhanced, and the corrosion process is obviously accelerated on the premise of not changing the authenticity of a marine environment; the double problems that a traditional indoor acceleration test is poor in correlation with the actual service environment and the natural exposure test period is too long are solved.

The application relates to the technical field of material corrosion behavior modeling and industrial equipment data analysis, and provides a unified correlation modeling method for air conditioner operation parameters and multi-material corrosion behavior; the technical route is as follows: operation parameter collection, corrosion data acquisition, data matching and alignment, sensitive parameter screening, single-material response construction, multi-material unified modeling and model verification output, and the method specifically comprises the following steps: air conditioner operation parameter collection, multi-material corrosion data acquisition, data matching and alignment, corrosion sensitive parameter screening, single-material corrosion response relationship construction, multi-material unified modeling, model verification and output. The application has the following advantages: unified modeling of corrosion behaviors of various engineering materials is realized, the generalization ability of the model among different materials is improved, the model interpretability and engineering practicability are enhanced, the comparability expression of corrosion behaviors of different materials is realized, scientific decision of material selection is supported, and the application is suitable for large-scale deployment and corrosion management of various air conditioning systems.

The invention belongs to the technical field of deep sea corrosion experimental equipment, and particularly relates to an integrated deep sea high-pressure microbial corrosion simulation system and a use method thereof. The system comprises a control system, an electrochemical workstation, a high-pressure corrosion simulation device, a microbial culture device, a temperature control assembly and a real-time monitoring assembly, and data collection and control are performed through the control system; the high-pressure corrosion simulation device comprises a high-pressure kettle, the high-pressure corrosion simulation device is connected with the microorganism culture device, and the microorganism culture device comprises a reaction kettle. According to the invention, pressure and microbial corrosion in the deep sea environment can be simulated, and the corrosion behavior of the metal material in the deep sea environment can be comprehensively and accurately monitored in cooperation with a tensile test and electrochemical corrosion monitoring. Through cooperative work of the autoclave and the reaction kettle, it is guaranteed that the pressure in the autoclave meets the deep sea pressure requirement, it is guaranteed that a culture medium input into the autoclave is sterile from the source, the purity of an experiment and the accuracy of data are guaranteed, and the real environment can be better simulated.

The invention discloses an aluminum alloy surface corrosion process prediction method considering residual strain, and particularly relates to the field of aero-engine protection. Comprising the following steps: acquiring oxide film components and a corresponding crystal structure on the surface of the aluminum alloy in a corrosion environment, extracting corrosion medium ions, and constructing a surface model; determining the tensile strength and the compression strength of the surface model; constructing a plurality of adsorption configurations; determining a residual strain range according to the tensile strength and the compression strength; in the residual strain range, tensile or compressive strain is applied to any adsorption configuration, and the adsorption energy of current corrosive medium ions in the adsorption configuration under different strains is determined; determining diffusion barriers of corrosive medium ions in the oxidation film under different strains; determining the adsorption energy-diffusion barrier ratio of the corrosion medium ions in the adsorption configuration under each strain; and predicting the corrosion process of the aluminum alloy surface according to the adsorption energy-diffusion barrier ratio under each strain. By means of the method, the corrosion behavior under the complex working condition can be accurately predicted.

The invention discloses an offshore power station corrosion prediction method, device and equipment and a storage medium, and relates to the technical field of marine corrosion monitoring, and the method comprises the steps: obtaining the environment monitoring data of an offshore power station; the actual corrosion state of the target monitoring part on the offshore power station is determined, and the determining mode of the actual corrosion state comprises at least one of the steps of applying a high-frequency signal and adjusting thermocouple probe monitoring; and predicting the corrosion state of the target monitoring part according to the environment monitoring data and the actual corrosion state to obtain the predicted corrosion state of the target monitoring part. According to the method, the real-time environment data is associated with the real corrosion response of the structure, and multi-source information fusion analysis of the environment driving factors and the actual corrosion behavior of the structure is realized, so that the corrosion state of the key part of the offshore wind turbine generator is accurately predicted, and a reliable basis is provided for timely finding corrosion hidden dangers and formulating targeted protective measures.

The invention discloses a microbial corrosion control method based on biological membrane attachment area regulation, which comprises the following steps: under the condition of keeping the volume of a liquid culture medium and a bacterial strain unchanged, introducing solid fillers which account for a fixed total volume but have different specific surface areas into a closed anaerobic reactor so as to form a multi-stage attachable area; a pretreated metal sample is placed in the closed anaerobic reactor, and the surface of the sample is only in contact with the culture medium and the biological membrane distribution area determined by the filler; and culturing at the same temperature and time, and synchronously monitoring the growth, corrosion rate and gas production rate of the biological membrane, so as to establish a quantitative relationship among biological membrane distribution area-corrosion behavior-mechanical property, and realize directional control of the microbial corrosion process by regulating and controlling area parameters.

The application discloses a kind of aluminum alloy surface corrosion process prediction methods considering residual strain, specifically related to the field of aero-engine protection.It includes: obtaining the composition of the oxide film on the surface of aluminum alloy and the corresponding crystal structure under the corrosion environment, extracting the corrosion medium ions, and constructing a surface model; Determine the tensile and compressive strength of the surface model; Build multiple adsorption configurations; According to the tensile and compressive strength, determine the residual strain range; Within the residual strain range, apply tension or compression strain to any adsorption configuration, determine the adsorption energy of the current corrosion medium ions in the adsorption configuration under different strains; Determine the diffusion barrier of the corrosion medium ions in the oxide film under different strains; Determine the adsorption energy-diffusion barrier ratio of the corrosion medium ions in the adsorption configuration under each strain; According to the adsorption energy-diffusion barrier ratio under each strain, predict the corrosion process of the aluminum alloy surface. Through the above method, the corrosion behavior under complex working conditions can be accurately predicted.

This invention discloses an online assessment system for the corrosion resistance of high-nitrogen steel under multi-factor coupled corrosion, belonging to the field of metal corrosion monitoring and assessment technology. It includes modules for data acquisition, feature processing, state evolution, path matching, and performance evaluation. The data acquisition module collects multivariate time-series corrosion data in real time through a sensor array. The feature processing module obtains a corrosion dynamic feature vector through missing value imputation, abnormal fluctuation filtering, and multi-source data time synchronization alignment. The state evolution module inputs the vector into a pre-trained deep corrosion behavior prediction model, generating a micro-corrosion state evolution map through a multi-layer feature fusion network. The path matching module matches the corresponding corrosion kinetic evolution path. The performance evaluation module calculates performance degradation curves at different depth levels and generates a quantitative report on corrosion resistance levels. This system can achieve accurate characterization of the micro-evolution of high-nitrogen steel corrosion and online quantitative assessment of layered corrosion resistance under multi-factor coupled environments.

The invention discloses a method for regulating and controlling stress corrosion cracking of microorganisms. The method comprises the following steps: preparing a U-shaped sample and calibrating a stress concentration area of the U-shaped sample; under the condition of constant culture medium volume, strain and inoculum size, constructing a biological membrane attachment area gradient by adding solid fillers with different specific surface areas; immersing the sample subjected to stress application into a culture medium, and enabling a stress concentration area to directly face the maximum attachment surface; after constant-temperature culture, corrosion indexes are detected, SEM is combined to observe crack morphology and XPS is combined to analyze product components, a quantitative relation of'biofilm attachment area corrosion rate crack propagation depth 'is established, and microbial stress corrosion behaviors are directionally controlled by regulating and controlling the attachment area. According to the method, the influence mechanism of biological membrane distribution on stress corrosion cracking of the material can be accurately analyzed.

The invention discloses a CO2 stress corrosion test system and method for a non-adhesive flexible pipe, and relates to the technical field of ocean engineering and oil and gas equipment tests. The system comprises a base and a supporting frame, an axial loading device, an internal pressure and torsion loading device, a follow-up bending moment balancing device and an end follow-up sealing device are arranged on the base, and a movable lifting environment chamber device is arranged on the supporting frame. The follow-up bending moment balancing device and the end follow-up sealing device form a flexible boundary constraint system, and the movable lifting environment chamber device is used for locally forming a high-temperature and high-pressure COcorrosion environment on the outer wall of the flexible pipe, can move in the axial direction of the flexible pipe and synchronously ascends and descends along with bending displacement in the alternating bending loading process. Therefore, the position of a corrosion area is kept stable under the dynamic load condition, and through the collaborative design of multi-load coupling loading, a local movable corrosion environment and multi-source online monitoring, true simulation and quantitative evaluation of the COstress corrosion behavior of the non-adhesive flexible pipe under the actual service working condition are achieved.

The application provides a method for preparing an aluminum electrode by molten salt-ultrasonic synergistic modification and application, and relates to the technical field of metal electrode material smelting and preparation. The method comprises raw material configuration and mixing, construction of a molten salt / aluminum liquid two-phase reaction system, ultrasonic synergistic molten salt etching and in-situ metal loading, selective interface screening and directional transport, ultrasonic driving interfacial migration and dispersion anchoring, cooling and solidification, and finally obtaining an MXene dispersed embedded aluminum-based composite anode material. The obtained MXene sheet layer has a thickness of 10-500-nm, a lateral size of 200nm-20um, and a surface rich in -F, -O and -Cl functional groups, and the loaded metal exists in the form of surface adsorption or interlayer embedding. The aluminum-based composite anode material prepared by the application can effectively inhibit the hydrogen evolution side reaction and self-corrosion behavior, reduce the corrosion current density, improve the anode utilization rate and maintain high discharge performance, and can be applied to aluminum-air batteries, aluminum-oxygen batteries, aluminum-ion batteries and other energy storage devices with aluminum as the negative electrode, and is also suitable for the fields of metal corrosion prevention and interface regulation.

The invention provides a high-flow-rate supercritical carbon dioxide environmental material corrosion experimental device and a detection method, stable and controllable supercritical carbon dioxide fluid is provided through cooperation of a supercritical fluid pump, a precise preheater and a back pressure valve, and fully-closed circular flow of a working medium is realized by using a high-frequency regulating valve and an anti-backflow one-way valve. A multi-channel parallel high-pressure reaction kettle structure is adopted, and an independently controlled variable-power heating and cooling module is matched, so that a high-flow-rate, variable-temperature and variable-load corrosion environment is synchronously applied to a plurality of samples. And a high-precision carbon monoxide analyzer is integrated to monitor the carbon monoxide concentration in the reaction process in real time, so that the dynamic calculation of the corrosion rate, the preliminary prediction of the material life and the early warning of the oxide skin peeling risk are realized. The device can highly simulate the real service condition of the pressure-bearing component in the supercritical carbon dioxide Brayton cycle system, and provides an experimental platform for researching the corrosion behavior of a material in a high-temperature, high-pressure and high-flow-rate coupling environment.

The application provides a material surface interface damage in-situ characterization system for multi-factor coupled corrosion, relates to the technical field of in-situ detection equipment, and aims to solve the technical problems that the material surface interface cannot be observed in-situ under a simulated service environment and the corrosion behavior dynamic evolution rule of the same area in a corrosion process cannot be accurately tracked in the prior art. The material surface interface damage in-situ characterization system for multi-factor coupled corrosion is realized by a salt mist generating device, a multi-point heating module and a corrosion-resistant loading table to simulate multi-field coupled corrosion of heat, salt and force, X-ray incidence and X-ray emission windows allow an X-ray diffractometer to perform in-situ diffraction testing, in-situ phase analysis of corrosion products under simulated working conditions is realized, the corrosion-resistant loading table can enter an electron microscope to perform micro-area structure and micro-area component analysis, the multi-point heating module can keep the sample state consistent in the X-ray diffractometer and the electron microscope, and different heating points can perform environmental experiments of heat, salt and force.

The invention discloses a medical magnesium alloy dynamic electrochemical corrosion test method based on a microfluidic technology, and belongs to the field of medical magnesium alloy corrosion evaluation. The method comprises the following steps: constructing a micro-fluidic system for dynamic electrochemical testing by utilizing a constant-temperature water bath kettle, an electrochemical workstation, a peristaltic pump and a PDMS (polydimethylsiloxane) chip; controlling solution temperature and flow velocity, and simulating the flowing state of human body fluid; a three-electrode system is adopted to test the initial electrochemical performance of the magnesium alloy, open-circuit potential and other electrochemical curves of the magnesium alloy are tested at different soaking times, and the corrosion behaviors of the magnesium alloy at different time periods are monitored. According to the method, the corrosion resistance change of the magnesium alloy in different soaking time periods is monitored through a method combining electrochemical testing and dynamic soaking, the degradation process of the magnesium alloy in a human body is simulated, operation is easy, and animal experiments and other methods which are long in time consumption and high in cost do not need to be adopted.

The invention provides a floating type wind turbine foundation structure fatigue life calculation method under multi-field coupling, and relates to the technical field of wind turbine structure fatigue life calculation.By establishing a corrosion attenuation model, quantitative description of the coating corrosion depth along with time and environmental parameter changes is achieved, and the mooring line corrosion behavior under the complex sea area environment is reflected; based on historical sea condition data decomposition and time sequence analysis, accurate environmental load time sequence input is obtained, and a first fatigue life without considering corrosion influence is obtained by utilizing finite element simulation and combining a rain flow counting method and a fatigue accumulative damage theory; and then a correction factor is constructed based on the corrosion effect of the mooring line to correct the first fatigue life and obtain a second fatigue life considering the corrosion influence, so that the influence of the corrosion effect on the fatigue life of the mooring line is effectively reflected, the deviation of corrosion influence estimation in a traditional method is reduced, and the accuracy of the method is improved. And the accuracy and credibility of fatigue life prediction of the floating fan foundation structure are improved.

The invention discloses a method for improving corrosion resistance of SA508Gr.4N steel for a nuclear pressure vessel, and belongs to the technical field of nuclear power key structural materials. According to the method, Zn < 2 + > is injected into a loop water solution of a simulated pressurized water reactor nuclear power station, so that the surface rust layer of the SA508Gr.4N steel is modified, and the corrosion resistance of the SA508Gr.4N steel is improved. The modified rust layer structure is more stable, the protection performance on a matrix is improved, and the corrosion behavior of the SA508Gr.4N steel for the nuclear pressure vessel can be effectively improved. Compared with an existing nuclear pressure vessel protection means, the nuclear pressure vessel protection device is simpler in operation and more remarkable in effect.

The present application relates to a kind of experimental apparatus of simulating corrosion environment in oil and gas field equipment corrosion failure process, including kettle cover and kettle body bolt connection, kettle body is equipped with electric heating system and lining, lining is connected with kettle cover bottom, the end of coaxial magnetic force drive stirring system is rotating shaft, rotating shaft passes through kettle cover and extends into lining;Gas inlet valve, exhaust valve, pressure transmitter, safety burst valve group, temperature transmitter, upper liquid discharge needle valve respectively from the insertion port of kettle cover extend into lining, the control system is used to with coaxial magnetic force drive stirring system, electric heating system, gas inlet valve, exhaust valve, pressure transmitter, safety burst valve group, temperature transmitter, upper liquid discharge needle valve connection.The present application effectively reduces the cost increase phenomenon caused by the function overlap of single equipment, can meet the corrosion behavior research in high temperature and high pressure environment, supercritical water environment.

The invention provides an in-situ detection method for the state of an oxidation film on the surface of an aluminum alloy, and relates to the field of corrosion and protection research. The method comprises the following steps: an aluminum alloy to be detected is used as a working electrode, the working electrode and an auxiliary electrode are alternately arranged, adjacent electrodes are separated by an insulating spacer, the working electrode and the auxiliary electrode are respectively connected to a wiring terminal, and the aluminum alloy galvanic corrosion sensor is obtained through packaging; the current collector is connected to the micro-galvanometer and arranged in a target environment to collect current signals; when the sensor works, a galvanic corrosion current value generated by the sensor is closely related to an aluminum alloy surface state and an environmental medium; based on the characteristic, the current value and the change rate serve as characterization parameters of the aluminum alloy surface oxidation film, and the damage process of the aluminum alloy oxidation film is monitored in real time by monitoring galvanic corrosion current. The method has the advantages of being easy and convenient to operate, rapid in response, capable of achieving in-situ monitoring and the like, and an effective means is provided for in-situ monitoring and early warning of the aluminum alloy surface corrosion behavior.

The invention relates to the technical field of microorganism crevice corrosion experiments, in particular to a microorganism crevice corrosion simulation experiment device with an adjustable opening degree and an operation method. The microorganism crevice corrosion simulation experiment device with the adjustable opening degree comprises a simulation experiment box, a metal sample and an adjusting mechanism, the metal sample is arranged between the inner walls of the two opposite sides of the simulation experiment box, and the adjusting mechanism is connected with the metal sample; the adjusting device is used for adjusting a gap between the metal sample and the inner wall of one end of the simulation experiment box. The device has the advantages that the growth conditions of microorganisms in anti-corrosion layer stripping environments with different opening degrees can be measured, characterization analysis of samples after crevice corrosion can be realized, and the device can accurately control the opening degree of the crevice, so that researchers are allowed to monitor microorganism activity and metal corrosion processes in different crevice environments. The technical support is provided for researching the growth rule of corrosion microorganisms in the anticorrosive coating stripping gap environment and the corrosion behavior of a metal sample in the gap environment.

The invention discloses an environment simulation accelerated corrosion test method for a spray splash zone, which comprises the following steps: sorting material attributes, environmental factors and corrosion state data corresponding to a series, and respectively carrying out importance evaluation on the environmental factors influencing the corrosion rate and corrosion behavior of the splash zone; counting and analyzing an atmospheric environment value quantization interval and a change condition to form a splash zone atmospheric environment accumulation spectrogram; carrying out statistical analysis on a seawater environment value quantization interval and a change condition to form a splashing region seawater environment accumulation spectrogram; corresponding test environment parameter conditions and cycle combinations are determined through equivalent conversion in the effective corrosion action process of the atmosphere and seawater environment in the splash zone; carrying out a real sea splash zone coupon corrosion test; carrying out an indoor simulation accelerated corrosion test; and carrying out correlation analysis on the real sea test data and the indoor acceleration simulation test data of the splash zone. The acceleration multiplying power is determined through a real sea experiment result and an indoor simulation experiment result, and iterative optimization design is carried out on environment factor data.

The invention discloses an online evaluation system for corrosion resistance of high-nitrogen steel under multi-factor coupling corrosion, which relates to the technical field of metal corrosion monitoring and evaluation and comprises a data acquisition module, a feature processing module, a state evolution module, a path matching module and a performance evaluation module. The data acquisition module acquires multivariate time sequence corrosion data in real time through a sensor array, and the feature processing module obtains a corrosion dynamic feature vector through missing value interpolation, abnormal fluctuation filtering and multi-source data time synchronization alignment processing. The state evolution module inputs a vector into a pre-trained deep corrosion behavior prediction model, a microscopic corrosion state evolution graph is generated through a multilayer feature fusion network, the path matching module matches a corresponding corrosion dynamics evolution path, and the performance evaluation module calculates performance degradation curves of different depth levels and generates a corrosion resistance level quantification report. The system can realize accurate characterization of high-nitrogen steel corrosion microcosmic evolution and online quantitative evaluation of layered corrosion resistance in a multi-factor coupling environment.

This invention provides an experimental method for simulating high-pressure seawater corrosion inside pipes. The apparatus includes a seawater circulation system and a temperature control system. The seawater circulation system includes a seawater tank. Seawater in the tank is partially driven by a centrifugal pump through an isolation valve and returns to the seawater tank via a bypass valve to mix the seawater inside. The remaining seawater passes through a main line resistance regulating valve and enters a branch test pipeline. In the branch test pipeline, the seawater sequentially passes through a branch line resistance regulating valve, a branch flow meter, and the test tank before converging into the main line return water pipeline and flowing back to the seawater tank via a return water resistance regulating valve. The seawater tank is connected to a pressure control device. This experimental apparatus simulates the corrosion of pipes in a deep-sea environment. Long-term simulation and observation of corrosion behavior are achieved through this apparatus, enabling precise temperature control over a wide temperature range. It can simulate the temperature difference environment inside and outside the pipe, reproducing the corrosion conditions under real heat exchange conditions.

The invention discloses a karst corrosion speed testing system and method, and belongs to the technical field of karst geology and environmental engineering test.The karst corrosion speed testing system comprises a supporting platform, an upper water tank is arranged on the top face of the supporting platform, a lower water tank is arranged at the bottom of the supporting platform, a water circulation pipeline is communicated between the upper water tank and the lower water tank, and a testing mechanism is arranged between the upper water tank and the lower water tank; the testing mechanism comprises a plurality of channel pipes arranged between the upper water tank and the lower water tank side by side, rock samples are arranged in the channel pipes, and speed adjusting parts are arranged on the channel pipes. By arranging the rock samples with different upstream cross sectional areas and the channel pipes matched with the rock samples and combining the height-adjustable upper water tank and the water circulation pipeline, comparison simulation of karst corrosion behaviors under different flow velocity conditions is achieved, and then corrosion rate changes under different physical parameters are quantified.