125 results about "Corrosion behavior" patented technology

The invention relates to the technical field of corrosion detection, in particular to a grounding grid corrosion intelligent monitoring system which comprises an electrochemical data capture module, a corrosion behavior analysis module, a corrosion probability evaluation module and a monitoring strategy optimization module. According to the method, data errors and abnormal values are filtered and corrected, the overall quality of data is improved, the accuracy of analysis results is ensured, and in corrosion behavior analysis, the future trend of corrosion is effectively predicted through dynamic change detection of electrochemical properties and calculation of the corrosion rate; the time sequence analysis of the electrochemical impedance data not only enhances the prediction accuracy, but also improves the understanding depth of corrosion behaviors, the corrosion probability evaluation module adds consideration of random changes to the whole prediction model through the application of the Markov chain, so that the model is closer to the uncertainty of the real world, and through the optimization of the processing flow, the prediction accuracy is improved. The real-time performance and the early warning capability of the monitoring system are obviously improved, and the reliability and the operation accuracy of the system are enhanced.

The invention discloses a method for predicting the damage of a prestressed concrete cylinder pipe in a complex environment, and relates to the technical field of pipeline structure health monitoring, and the method comprises the steps: collecting multi-physical field data through deploying multiple types of sensors, transmitting the data to a central monitoring system in a wireless manner, carrying out the standardized preprocessing, and obtaining a multi-source fusion data set; a salt migration driving index dsa, a stress disturbance induction index yry and an electrochemical activity potential index che are constructed, a comprehensive corrosion risk index SCR is obtained, and corrosion behavior evaluation is carried out. And when the corrosion behavior is evaluated as a disturbance sign, a corrosion change prediction index CAR is further calculated according to time sequence evolution forming a corrosion risk index SCR, grading evaluation and transition identification of the corrosion state are realized, an evaluation result is stored in a database, and a corrosion risk evolution trend is presented through a visual chart. The method supports early warning and emergency response decision making, and has high adaptability and engineering practicability without adding hardware.

The invention relates to the technical field of researching or analyzing materials by testing chemical or physical properties of materials, in particular to an intelligent analysis method for corrosivity of sulfide molecules in transformer oil. The influence of the oil environment on the adsorption energy is simulated and corrected in combination with molecular dynamics, a microscopic parameter database is constructed, and a corrosion risk grade classification rule and a generation rate prediction model are established. Oil data are collected in real time and input into the model to output a dynamic risk level, and a circulation rate adjusting or corrosion inhibitor adding instruction is triggered. Model parameters are regularly corrected by combining a closed-loop feedback mechanism, and a microscopic database is expanded, so that transfer learning prediction of unknown sulfide corrosion behaviors is realized. According to the method, the limitation of an existing single experiment condition is broken through, the relevance between a microcosmic molecular mechanism and a macroscopic corrosion behavior is dynamically analyzed, and the prediction precision under the multi-factor coupling effect is improved.

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 present invention discloses a method for predicting an internal corrosion rate of an oil and gas pipeline based on IWOA-SVM. The method comprises the following steps: S1. selecting factors that are representative of and correlated with internal corrosion behavior during operation of the oil and gas pipeline as input variables; S2. preprocessing the input variables and organizing the processed data into a dataset; S3. dividing the dataset into a training set and a test set; S4. establishing a corrosion rate prediction model for the oil and gas pipeline based on IWOA-SVM, and predicting the internal corrosion rate. The invention enhances the traditional whale algorithm and integrates it with the SVM method. The improvement includes introducing adaptive weights and nonlinear convergence factors, thereby balancing global search and local exploitation capabilities, making it have strong global search capabilities and is less likely to become trapped in local optima.

The invention relates to the technical field of material testing, and discloses a material stress and micro-electrochemical in-situ corrosion potential testing device and a material stress and micro-electrochemical in-situ corrosion potential testing method. The invention provides an experimental device capable of simulating different stresses and actual test conditions and accurately evaluating the micro-area stress corrosion behavior of a material, and the stress corrosion and micro-area corrosion potential change rules of the material under different stress and electrochemical coupling effects are visually measured in situ. And a technical support is provided for revealing a stress corrosion mechanism in a metal material service environment. Meanwhile, different sample test requirements of a plurality of material product production lines are considered, high-accuracy and high-flexibility adjustment of multiple test conditions is realized, and by planning a scientific and reasonable sample test distribution strategy, the test frequency requirement of parallel task test of the multiple material product production lines and the test device switching target are met, and the test efficiency is improved. The efficiency and operation reliability of the test system are improved.

The present invention belongs to the technical field of metal materials, and particularly relates to a high-corrosion-resistant magnesium alloy sheet having filiform corrosion characteristics and a preparation method thereof. Based on the total amount of the magnesium alloy sheet, in terms of mass percentage, the magnesium alloy sheet contains the following elements: Al: 6-9%, Sc: 0.05-0.15%, Y: 0.05-0.15%, Mn: 0.05-0.15%, and the balance is Mg and inevitable impurity elements; the alloy preparation method includes: alloy ingot melting, ingot solution treatment, extrusion into sheets, and then multi-pass rolling treatment and aging heat treatment regulation. Among them, the magnesium alloy sheet has a phase structure of dispersed Mg 17 Al 12 phase, and its corrosion behavior is typical filiform corrosion characteristics, which has the advantages of shallow corrosion depth and small destructiveness compared with traditional pitting corrosion. The magnesium alloy sheet in the present invention has excellent mechanical properties and corrosion resistance.

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

The invention discloses an improved LSTM (Long Short Term Memory)-based method and device for predicting a corrosion behavior of an iron-chromium alloy in a closed environment. The method comprises the following steps: acquiring corrosion dynamics experimental data of the iron-chromium alloy; based on the improved LSTM model, constructing an iron-chromium alloy corrosion model; the corrosion kinetics experimental data are input into the ferrochromium alloy corrosion model, and corrosion kinetics prediction data are obtained; based on the improved LSTM model, combining physical constraint conditions to construct an iron-chromium alloy oxidation weight gain prediction model; obtaining a weight change prediction value and an oxidation rate prediction value of the iron-chromium alloy through the iron-chromium alloy oxidation weight increment prediction model; and obtaining the corrosion behavior of the ferrochromium alloy according to the corrosion kinetics prediction data, the weight change prediction value and the oxidation rate prediction value. The method can improve the accuracy of iron-chromium alloy corrosion behavior prediction, and can be widely applied to the technical field of machine learning.

The invention provides an ammonia hydrogen energy structure material constant strain rate and constant load stress corrosion synchronous monitoring platform based on acoustic emission and an implementation method thereof. Comprising a gas supply and pressurization system, a constant strain rate and constant load stress corrosion synchronous test system, a gas leakage safety control system, an acoustic emission and digital image correlation (DIC) technology online monitoring analysis system, a temperature control system and a computer integrated analysis system. In-situ dynamic analysis of stress corrosion crack propagation is realized in combination with a DIC technology; the temperature control system realizes accurate temperature control on the corrosion test reaction kettle through an independent temperature control module; the computer integrated analysis system processes multi-source data, and establishes dynamic mapping between acoustic emission characteristic parameters and corrosion crack growth rate. The platform solves the problems of off-line monitoring, single loading mode and the like of a traditional corrosion test, captures a corrosion-induced crack propagation process in real time, improves test efficiency and analysis comprehensiveness, and provides powerful support for research on corrosion behaviors of ammonia hydrogen energy structural materials.

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 invention relates to the field of metal corrosion behavior monitoring and characterization, in particular to a long-term corrosion test device and method for a high-level radioactive waste geological disposal packaging container material. The test device comprises an open container, a sealing material, a temperature-resistant plastic sealing tank, a buffer material, a temperature control component, a packaging container candidate material test sample, a wire and silicone rubber, the sealing material is arranged in the open container, the temperature-resistant plastic sealing tank is embedded in the sealing material, the buffer material is filled in the temperature-resistant plastic sealing tank, and the temperature control component is arranged in the temperature-resistant plastic sealing tank. A sensor for electrochemical impedance spectroscopy measurement, a corrosion weightlessness sample and a corrosion product characterization sample are embedded in the buffer material; the wire penetrates through a sealing tank top cover of the temperature-resistant plastic sealing tank, and the temperature control component is inserted into the sealing tank top cover of the temperature-resistant plastic sealing tank. The device is suitable for long-term corrosion research and evaluation of a packaging container candidate material in a high-level radioactive waste geological disposal buffer material environment, and has the characteristics of multiple functions, high operability, good sealing performance, high stability and real-time measurement.

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 invention relates to a method and device for simulating and evaluating the corrosion resistance of metals in a frozen soil environment, belonging to the technical field of evaluating the corrosion resistance of metal materials, and solves the problem that there is no reliable evaluation and preliminary screening technology for the corrosion resistance of metals in a frozen soil environment in the prior art, and thus it is impossible to predict the corrosion resistance of metal materials in a frozen soil environment. The present invention provides a simulation and evaluation method, which pre-configures a simulated corrosion solution and sets a temperature curve, and evaluates the corrosion performance of metal materials in a frozen soil environment by the method of full immersion corrosion. The method is used in cooperation with a dedicated device, and can simulate the corrosion behavior of metal materials in a frozen soil environment in a laboratory scenario, and can preliminarily evaluate and compare the corrosion resistance of different types of metal materials in a frozen soil environment, providing support for the selection and research and development of metal materials for equipment or construction in a frozen soil environment.

The invention provides a deep sea water and sea mud corrosion test device adaptive to a manned bathyscaph and an application method, the deep sea water and sea mud corrosion test device comprises a test device main body, a frame main body forms an accommodating space, and a T-shaped support column higher than the test device is vertically arranged at the central position of the frame main body; the frame main body comprises a seawater corrosion test layer, a monitoring equipment layer and a sea mud corrosion test layer; the seawater corrosion test layer comprises two layers of sample mounting bulkheads, the first layer of bulkhead is fixed in a string hanging manner, and the second layer of bulkhead is fixed by bolts; the monitoring equipment layer is arranged between the seawater corrosion test layer and the sea mud corrosion test layer and integrates deep sea environment parameter monitoring and typical sample corrosion behavior monitoring functions; the sea mud corrosion test layer is arranged at the bottom layer of the frame main body and comprises a sea mud sample mounting bulkhead and a four-corner supporting structure. While the carrying requirement of the manned bathyscaph is met, the light weight, integration and multi-functionalization of the test device can be realized, and the deep sea water / sea mud corrosion test can be carried out in all directions.

The utility model relates to the technical field of electrochemical measurement, and discloses a thin liquid film electrochemical measurement device based on metal corrosion simulation, which comprises a workbench, one side above the workbench is fixedly connected with a rotating base, and the upper part of the rotating base is rotatably connected with a support rod. According to the thin liquid film electrochemical measurement device based on metal corrosion simulation, through the arrangement of the three electrodes, the sealing box, the sealing cover and the regulation and control mechanism, when thin liquid film electrochemical measurement is carried out, a measurement instrument sets the measured temperature and potential, a liquid barrel accurately controls the amount of thin film liquid, and a heating piece and a temperature sensor jointly accurately control the experimental temperature; the reference electrode provides stable potential to ensure that a stable experimental environment is maintained in the sealing box, the measuring instrument collects electrochemical data in real time and analyzes the electrochemical data, and a graphical interface on the display screen is provided for display, so that the experimental environment and electrochemical parameters are accurately controlled, and the corrosion behavior of metal can be efficiently simulated and analyzed.

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 provides a method for predicting the service life of a zinc strip, and the method comprises the following steps: determining the service life of a to-be-predicted zinc strip according to the minimum section diameter, the corrosion allowance coefficient and the corrosion rate of the to-be-predicted zinc strip. According to the method for predicting the service life of the zinc strip, determination is carried out according to the minimum section diameter, the corrosion allowance coefficient and the corrosion rate of the to-be-predicted zinc strip, the physical or chemical parameters directly reflect the corrosion behavior and performance change of the zinc strip in a specific environment, errors caused by a single factor are avoided, and therefore the prediction accuracy is high.

The invention provides a material surface and interface damage in-situ characterization system for multi-factor coupling corrosion, and relates to the technical field of in-situ detection equipment. The technical problem that in the prior art, in-situ microscopic observation cannot be conducted on a material surface interface in a simulated service environment, and the dynamic evolution rule of surface interface corrosion behaviors in the same area in the corrosion process cannot be accurately tracked is solved. According to the material surface and interface damage in-situ characterization system for multi-factor coupling corrosion, simulation of heat, salt and force multi-field coupling corrosion is achieved through a salt mist generating device, a multi-point heating module and a corrosion-resistant loading table, an X-ray diffractometer is allowed to conduct in-situ diffraction testing through an X-ray incident window and an X-ray emergent window, corrosion product in-situ phase analysis under the simulated working condition is achieved, and in-situ phase analysis of the corrosion product under the simulated working condition is achieved. And the corrosion-resistant loading table can enter the electron microscope for micro-area structure and micro-area component analysis, the multi-point heating module can keep the consistency of the sample state in the X-ray diffractometer and the electron microscope, and different heating sites can be used for heat, salt and force environment experiments.

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 discloses a long-period high-flux high-temperature lead-bismuth corrosion test device, and relates to the technical field of lead-bismuth corrosion experiments.Sample rods of an annular array sample frame are evenly distributed around a stirring assembly in the circumferential direction, a modular clamp is arranged at the tail end of each sample rod, and a single clamp integrates multiple independent sample groove positions, so that a high-flux test is achieved; parallel corrosion tests of various materials and various working conditions can be completed in a single experiment, and compared with a traditional single-sample experiment, the material screening efficiency is greatly improved, and the experiment period is shortened; the corrosion behavior of the ODS-FeCrAl alloy under different doping proportions and different corrosion time is tested and analyzed under the oxygen control condition, the long-term service condition of a nuclear reactor structure material in a lead-bismuth coolant environment can be accurately simulated, and a reliable experimental basis is provided for corrosion resistance evaluation and service life prediction of the material.

The present disclosure provides a pipeline corrosion inhibition system, method and electronic device. The present disclosure obtains corresponding concentration time series data by sequentially performing isobaric equilibrium sampling and concentration detection on at least one impurity in the pipeline through a sampling and detection module; corrosion simulation module, inputting the concentration time series data into a simulated pipeline to perform corrosion simulation, obtaining corrosion state data and simulated working condition data; pipeline life prediction module, receiving the concentration time series data, corrosion state data and simulated working condition data, inputting the data into a data fusion prediction model to obtain the pipeline remaining life and corrosion risk index; control module, sending a first control instruction to the sampling and detection module, and sending a second control instruction to the anti-corrosion module; anti-corrosion module, based on the second control instruction, performing at least one corrosion inhibition treatment. The present disclosure can comprehensively reflect the influence of the joint action of multiple impurities in the environment on the pipeline corrosion behavior, improve the accuracy, and can adapt to various scenes.

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 invention discloses a steel rail foot friction corrosion behavior research method, and belongs to the technical field of railway steel rail service performance research and failure mechanism evaluation. The research method comprises the following steps: preparing a U75V steel rail and PA66 lining cylindrical sample, constructing a test platform consisting of a control motor and an electrochemical test system, carrying out reciprocating friction and potentiodynamic and constant potential corrosion loading in a 3.5% NaCl solution, collecting corresponding corrosion current data, and analyzing the surface failure behavior. The invention aims to provide the method for researching the friction corrosion behavior of the rail foot of the steel rail, which is characterized in that a repeatable, controllable and low-cost test platform is constructed by simplifying an experimental device and combining a control motor and an electrochemical system, and a cooperative acceleration failure mechanism between fretting wear and crevice corrosion is disclosed.

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 discloses a material corrosion test device and method for simulating a nucleation boiling environment, and belongs to the field of nuclear power. The material corrosion test device for simulating the nucleation boiling environment comprises a circulating system, a test system and a control system, wherein the circulating system provides a circulating pipeline for accommodating a test solution; the test system comprises a test sleeve and a heating module, a test pipe fitting is installed in the test sleeve, and the heating module heats the test pipe fitting in an internal heating mode and provides an axial temperature field distributed in a gradient mode. The control system comprises a void fraction control module, and the output power of the heating module is adjusted according to a void fraction control algorithm so as to accurately control the void fraction formed on the surface of the test pipe fitting. The test device can accurately simulate the corrosion behavior of the fuel rod cladding tube in the nucleation boiling environment under the actual working condition, and has positive significance for improving the prediction precision of the corrosion behavior.

The invention relates to the field of metal corrosion behavior monitoring and characterization, in particular to a method for identifying oxygen corrosion evolution and oxygen corrosion evolution of a material in a high-level radioactive waste geological disposal environment. The method comprises two indexes: one index is an oxidation-reduction potential reflecting the overall oxidation-reduction characteristics of a corrosion system, namely an Eh value; the other one is a time constant reflecting the kinetic characteristics of reduction reaction (ORR) of dissolved oxygen in the corrosion system, namely an ORR-log (tau / s) value; the Eh value is measured by adopting an Eh electrode, and the ORR-log (tau / s) value is obtained by performing electrochemical impedance spectroscopy (EIS) measurement on a working electrode made of a metal material and then performing relaxation time distribution function analysis on EIS data. The method is suitable for identifying and researching the oxygen corrosion evolution of the disposal container candidate material in the high-level radioactive waste geological disposal environment, and has the characteristics of simple method, easily available parameters, strong operability, high accuracy, good long-term stability and real-time measurement.

This invention relates to the field of ring main unit (RNU) structural sealing performance testing technology, and provides a method and system for detecting perfluorohexanone (PFH) mixed gas leakage in RNUs. The method includes obtaining corrosion behavior prediction data based on a corrosion behavior prediction model using acquired monitoring images of sea salt particle deposition on the target sealing structure of the RNU and acoustic emission signal data; predicting corrosion damage based on a corrosion damage prediction model using the corrosion behavior prediction data and ultrasonic echo signal data of the target sealing structure; and determining the gas leakage location by performing sound source localization analysis based on the corrosion damage prediction result and acoustic emission signal data when the corrosion damage prediction result meets preset gas leakage conditions. This invention, based on corrosion damage mechanism research, achieves real-time quantitative analysis of the corrosion degree of the sealing structure and real-time accurate monitoring of the mixed gas leakage location, providing a reliable guarantee for the safe operation of RNUs.

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.