241 results about "Corrosion testing" patented technology

The invention discloses a radiator salt spray corrosion life prediction method based on dynamic time warping, which belongs to the technical field of material corrosion test and life prediction, and comprises the following steps: collecting time sequence data of surface impedance and thermal resistance change of a radiator, constructing a dual-channel corrosion characteristic data set, and recording a salt spray concentration data value. The temperature data value and the humidity data value are combined, and an environment sensitivity weight vector is established. Accelerated corrosion in a salt spray environment is simulated, a laboratory accelerated corrosion test spectrum is generated, meanwhile, an actual environment fluctuation spectrum is monitored, the two spectrums are aligned by using a weight vector, accelerated corrosion data are obtained, and a basic life prediction value is calculated. And calculating an environment-structure coupling factor by combining the interaction between the three-dimensional structure characteristic parameters of the radiator and the temperature and humidity data values, correcting the basic life prediction value, and generating a final life prediction result. According to the method, double-channel feature alignment and coupling factor correction are adopted, and the corrosion life of the radiator of the specific structure under the actual working condition can be predicted.

The invention discloses a corrosion resistance detection device for PFA film production, and relates to the technical field of film corrosion detection. Comprising a box body, a mounting plate is fixedly connected to the interior of the box body, a mounting frame is fixedly connected to the upper end of the mounting plate, a rotating column is arranged on the inner top wall of the mounting frame in a penetrating mode, the rotating column is rotationally connected with the mounting frame, a rotating plate is fixedly connected to the lower end of the rotating column, and a plurality of corrosive liquid dropwise adding mechanisms are arranged on the rotating plate; the multiple corrosive liquid dropwise adding mechanisms are arranged in the circumferential direction of the rotating plate at equal intervals, a rotating mechanism connected with the rotating column is arranged on the mounting frame, a mounting groove is formed in the upper end of the mounting frame, a limiting mechanism is arranged in the mounting groove, and a partition plate located below the mounting plate is fixed in the box body. According to the invention, through movement of the PFA film, different corrosive liquids can carry out corrosion resistance detection on different positions of the PFA film in sequence, so that the corrosion resistance detection process is more efficient.

The invention discloses a scanning electrochemical microscope in-situ stress corrosion testing device and method, and belongs to the technical field of material stress corrosion testing, and the device comprises a base, a power transmission module, a clamping module, a corrosion module, a signal acquisition module and a scanning electrochemical microscope module. Slow strain rate stretching of a sample is achieved through a servo motor, a planetary gear speed reducer and a transmission mechanism, the clamping module is integrated with a force sensor to monitor loads in real time, the corrosion module provides a temperature-controllable corrosion environment, and the scanning electrochemical microscope module achieves electrochemical scanning of the surface of the sample. The device can synchronously obtain a load-deformation curve, corrosion morphology and microcell electrochemical information under stress-corrosion-temperature multi-field coupling, and provides an effective technical means for deeply researching a stress corrosion mechanism of a material. The method comprises the steps of sample installation, corrosion solution preparation, electrode arrangement, tensile test, electrochemical scanning and the like, and has the advantages of simplicity and convenience in operation, comprehensive data, high precision and the like.

The invention relates to the technical field of wind power blade material testing, and discloses a testing device and method for a salt spray corrosion test of a wind power blade composite material layer. According to the method, wind power blade composite material coating preparation parameters are obtained, and coating basic information is provided for subsequent performance evaluation; based on preset salt spray test environment control parameters, dynamic salt spray environment simulation conditions are generated so as to better fit the actual outdoor environment; then, a multi-sensor coupling monitoring network is constructed, real-time data acquisition is conducted on the corrosion process of the composite material coating, and comprehensive tracking of the corrosion process is achieved; processing real-time data by utilizing a corrosion characteristic analysis algorithm, generating a multi-dimensional corrosion characteristic index, and quantitatively representing the corrosion condition of the coating; and finally, evaluating the anti-corrosion stability of the new material coating in combination with the coating characteristic parameters and the multi-dimensional corrosion characteristic indexes. According to the method, the corrosion resistance of the coating in the actual environment can be more accurately reflected, and support is provided for research, development and application of the composite coating of the wind power blade.

This invention discloses a corrosion resistance testing device for PFA film production, relating to the field of film corrosion testing technology. It includes a housing, with a mounting plate fixedly connected inside the housing. A mounting frame is fixedly connected to the upper end of the mounting plate. A rotating column is penetrating the inner top wall of the mounting frame and rotatably connected to the mounting frame. A rotating plate is fixedly connected to the lower end of the rotating column. Multiple corrosive liquid droplet application mechanisms are provided on the rotating plate, evenly spaced along the circumference of the rotating plate. A rotating mechanism connected to the rotating column is provided on the mounting frame. A mounting groove is provided at the upper end of the mounting frame, and a limiting mechanism is provided inside the mounting groove. A partition plate is fixed inside the housing, located below the mounting plate. This invention, through the movement of the PFA film, enables different corrosive liquids to sequentially test the corrosion resistance of different positions on the PFA film, making the corrosion resistance testing process more efficient.

The invention discloses a metal corrosion testing device and method for simulating a dynamic interface of supercritical CO2 and an aqueous solution, and belongs to the technical field of metal corrosion testing. The metal corrosion testing device comprises a reaction kettle, a temperature control system, a gas control system, a supercritical CO2 / aqueous solution interface simulation control system and an electrochemical testing system, the supercritical CO2 / water solution interface simulation control system comprises an electric push rod, a time relay and a sample holder; one end of the electric push rod penetrates through the kettle cover of the reaction kettle and is connected with the time relay; the time relay is used for controlling periodic reciprocating motion of the electric push rod; the electrochemical testing system comprises an electrochemical workstation and an electrochemical probe; the electrochemical workstation is connected with an electrochemical probe, and the electrochemical probe is arranged on the corrosion exposure experiment sample; the temperature control system is arranged in the reaction kettle, and the gas control system is connected with the reaction kettle. The technical problem that the metal corrosion of the dynamic interface of the supercritical CO2 and the aqueous solution cannot be accurately analyzed in the prior art is solved.

The invention relates to a high / low temperature wear-corrosion coupling damage test device and a quantitative evaluation method, and belongs to the technical field of wear corrosion test and material failure analysis. The device comprises a temperature-controllable corrosion test tank, a friction-wear test machine, an electrochemical workstation and a high-low temperature external circulation temperature controller, the temperature-controllable corrosion test tank is arranged on the friction-wear test machine, and friction-wear performance testing is achieved through reciprocating motion of the friction-wear test machine. And the temperature-controllable corrosion test tank is externally connected with an electrochemical workstation and a high-low temperature external circulation temperature controller and is used for testing corrosion performance and controlling temperature. According to the invention, high-precision testing and quantitative analysis of abrasion and corrosion of the metal-based material in high and low temperature environments are realized.

The invention relates to the field of material stress corrosion tests, in particular to a tubular clamp for a high-temperature and high-pressure supercritical carbon dioxide corrosion test and a use method. The tubular sample clamp is mainly composed of a stretching shaft adapter, a gantry pipe pressing clamp fixing bolt, a height adjusting nut, a tubular sample, a base threaded rod, a sample plug bolt and a gantry pipe pressing clamp, and the gantry pipe pressing clamp is mainly composed of a main frame, a pipe pressing clamp, a pipe containing frame, a fixing bolt hole, a gantry clamp screw, a rotary disc and a guide groove. The two groups of gantry pipe pressing clamps are respectively fixed on the stretching shaft adapter and the sample table with the height adjusting nut, and a tubular sample can be stably clamped by adjusting the two groups of gantry pipe pressing clamps and the height adjusting nut. The device is used for carrying out stress corrosion test on the tubular sample in a high-temperature and high-pressure S-CO2 medium, the stress corrosion cracking sensitivity of the tubular sample in S-CO2 is evaluated by adopting a slow strain rate tensile test, and the device has the characteristics of simple structure, convenience in operation, low cost and high practicability.

The invention discloses a chain ring corrosion test device with a complex environment simulation function, and relates to the technical field of corrosion test devices.The test device comprises an environment simulation mechanism, a clamping mechanism, a detection mechanism and a temperature control mechanism, the clamping mechanism is fixedly connected with the environment simulation mechanism, the detection mechanism is fixedly connected with the environment simulation mechanism, and the temperature control mechanism is fixedly connected with the clamping mechanism. The temperature control mechanism is fixedly connected with the environment simulation mechanism, the environment simulation mechanism provides a unified supporting platform and a space closed environment for all the mechanisms, the clamping mechanism achieves adaptive clamping of a workpiece through a multi-dimensional clamp and simulates an applicable environment through stretching and rolling-off actions, and the detection mechanism feeds back and achieves state monitoring. The temperature control mechanism adjusts the environment temperature through cold and hot medium circulation, and therefore the combined effect of multiple factors such as temperature, humidity, corrosivity and stress in the test environment is achieved.

The invention belongs to the technical field of corrosion tests, and relates to a corrosion resistance evaluation and service life evaluation method for a hot end component of an aero-engine. The invention designs a corrosion test method which simulates a working-stopping state alternating effect and is moderate in acceleration rate. Comprising the following steps: determining corrosion factors of a parking state and a working condition state; designing an accelerated corrosion test method with different corrosion action strengths; short-time accelerated corrosion tests with different corrosion strengths are carried out, and accelerated corrosion test parameter screening is completed; according to test parameters obtained through screening, a long-time accelerated corrosion test is completed, and corrosion damage law analysis, mechanical property attenuation analysis and service life evaluation after different times are carried out. According to the method, the corrosion resistance of the hot-end component in the marine atmospheric environment can be truly evaluated, the corrosion damage rule and the mechanical property attenuation evolution rule are efficiently obtained, and the service life of related materials serving in the marine atmospheric environment is accurately evaluated.

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 storage tank bottom plate corrosion risk prediction method based on electrochemical testing, and relates to the technical field of oil and gas storage and transportation monitoring, and the method comprises the steps: obtaining an external soil sample and an internal deposited water sample of a to-be-predicted storage tank, and obtaining the original environment parameters of the samples; the method comprises the following steps: respectively constructing a soil simulation solution and a deposition water simulation solution based on an out-tank soil sample and an in-tank deposition water sample, and respectively adding a standard metal sample made of the same material as a bottom plate of a to-be-predicted storage tank into the soil simulation solution and the deposition water simulation solution so as to realize an external corrosion test and an internal corrosion test, obtaining a corresponding corrosion test result; and inputting the original environmental parameters, the corrosion test result and the bottom plate information of the to-be-predicted storage tank into a preset corrosion risk assessment model to perform corrosion risk level prediction on the bottom plate of the to-be-predicted storage tank, and outputting the corrosion leakage risk level of the bottom plate of the to-be-predicted storage tank. And the bottom plate can be effectively inspected and predicted without periodically opening the tank.

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 invention relates to the technical field of corrosion tests, in particular to a deep soil environment simulation corrosion test device and method.The deep soil environment simulation corrosion test device comprises a test box, a plurality of opening air channels vertically distributed in soil in a penetrating mode and a heating unit composed of a circumferential heating part and an internal heating part vertically inserted into the soil. Gas is directly introduced into the soil through the perforated gas channel to adjust the oxygen content, the humidity and the chemical environment, the soil temperature is cooperatively adjusted through the heating unit, and dynamic closed-loop control is carried out based on feedback of the sensor. The environment regulation and control actuator is directly implanted into the soil, so that the problems of slow response, large gradient and incapability of simulating the deep low-oxygen compact soil environment caused by external regulation and control in the traditional method are solved, and accurate, rapid and uniform simulation and accelerated experiment on the deep soil corrosion environment are realized.

The invention discloses automobile terminal fretting corrosion testing equipment, and relates to the technical field of automobile terminal testing. The device comprises a high-strength device shell, a folding groove is formed in the position, close to one side corner, of the front end of the high-strength device shell, a terminal testing assembly is arranged at the position, close to the folding groove, of the bottom end of the interior of the high-strength device shell, and a high-precision resistance meter is arranged at the position, close to the terminal testing assembly, of the bottom end of the interior of the high-strength device shell. A turnover assembly is arranged on the inner wall of the side, close to the folding groove, of the high-strength equipment shell, the turnover assembly comprises a U-shaped supporting block, and the side end of the U-shaped supporting block is fixedly connected with the high-strength equipment shell; the two terminal fixing plates and the third supporting block are arranged to be detachable, the terminal fixing plates of different models can be conveniently replaced, the requirement for testing the automobile terminals of different models is met, the automobile terminal testing device can be compatible with the use conditions of most automobile terminals, and the application range of the device is expanded.

The present application relates to the technical field of material corrosion test, and particularly relates to a simulated deep-sea environment flowing seawater scouring corrosion electrochemical in-situ test device, which comprises a pressure tank and a hydraulic cylinder, the top end of the pressure tank is provided with a sealing cover, the moving end of the hydraulic cylinder is connected with the sealing cover, and the lower part of the outer lateral wall of the pressure tank is provided with a drain valve; the device further comprises a test assembly, an electrode assembly, a pressure control device, a cooling device, a motor, a hollow rotating shaft, a rotating disc, a positioning piece and an electrochemical workstation, the motor is installed on the top end sealing cover of the pressure tank, the top end of the hollow rotating shaft is rotatably installed on the inner lateral wall top of the sealing cover, the output end of the motor is connected with the top end of the hollow rotating shaft, the positioning piece is arranged on the top end of the rotating disc, and the lower part of the hollow rotating shaft extends into the positioning piece; the device can accurately and effectively simulate the corrosion conditions of metal materials under different hydrostatic pressures and different seawater flow rates, and can realize real-time electrochemical test under high rotating speed, thereby improving the test efficiency and convenience.

The invention discloses a metal material surface corrosion resistance testing device and method, and relates to a metal material corrosion resistance testing technology, the metal material surface corrosion resistance testing device comprises a testing machine body and a lifting stand column fixedly mounted at the rear of the top surface of the testing machine body; the test mechanism is arranged above the test machine body, the test mechanism comprises a test platform, test cone hoppers are arranged on the front side and the rear side of the interior of the test platform, and the test cone hoppers are used for limiting corrosive liquid to the interior so as to realize corrosion test; the bottom of the test platform is provided with a recovery mechanism, and the recovery mechanism comprises a recovery sliding plate. According to the device and the method for testing the surface corrosion resistance of the metal material, the double-station testing platform drives the testing cone hopper to perform corrosion testing on the metal material, and dust before testing and corrosive liquid after testing are collected, so that subsequent corrosion condition observation is facilitated; the convenience and the accuracy of the metal material in the testing process are improved.

The invention belongs to the technical field of corrosion and protection, and particularly relates to a multi-atmosphere high-temperature stress corrosion tensile test device and method.The multi-atmosphere high-temperature stress corrosion tensile test device comprises a tensile testing machine, a temperature control device, a sample, a telescopic pipe and an air supply device; the tensile testing machine is provided with clamps which are symmetrically arranged up and down and are used for clamping a sample, and the clamps are provided with flange plates which are hermetically connected with the telescopic pipe; the sample is clamped on a tensile testing machine clamp; the temperature control device is used for heating and preserving heat of the test environment; two ends of the telescopic pipe are hermetically connected with an upper clamp and a lower clamp of the tensile testing machine through flanges; the telescopic pipe is sleeved outside the sample to isolate the sample from the outside; and the air supply device is connected with the telescopic pipe and is used for filling air into the telescopic pipe. Influence factors such as corrosive gas flow and temperature can be independently regulated and controlled, high-temperature corrosion tests in complex environments can be realized, and requirements of material performance tests under different working conditions are met; and the manufacturing cost is low.

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 relates to the technical field of metal material service behavior testing, in particular to a stress corrosion testing device and a stress corrosion testing method for a solid-phase additive manufacturing joint micro-size sample. The device comprises a micro clamping module for realizing automatic centering and stable clamping; the micro-volume corrosion tank with the volume of 1-20 mL is used for forming a local corrosion environment and can be observed in situ; the external medium circulation and environment control system is used for providing liquid, gas or liquid / gas combined media and rapidly switching the environment; and the loading detection system is used for loading and recording force-displacement data according to a constant strain rate. The gauge length section of the sample is arranged in the corrosion tank, and the two ends are arranged on the clamping module and are accurately centered through the positioning groove and the pin. The micro-volume corrosion tank can quickly establish a corrosion environment, and the external medium circulation and environment control system can regulate and control the temperature, the flow velocity and the atmosphere, so that quick switching of different media is realized. According to the invention, high-precision stress corrosion testing can be realized on a micro additive interface, and the local area sensitivity evaluation capability is improved.

The invention belongs to the technical field of stress corrosion, and particularly relates to a testing device for in-situ local electrochemical corrosion of a pipeline steel crack tip in a multi-axial stress state. According to the technical scheme, the multi-axis stress corrosion testing device comprises a multi-axis stress corrosion testing box, a multi-axis stress corrosion testing assembly, motors, tension sensing receivers, an electrochemical workstation and a constant-temperature solution supply system, wherein one motor and one tension sensing receiver are connected into a group; a tension control mechanism and a shear force control mechanism of the multi-axial stress corrosion test box are respectively connected with two groups of motors and tension sensing receivers; the multi-axial stress corrosion test assembly is arranged in the multi-axial stress corrosion test box; and the multi-axis stress corrosion testing assembly is connected with the electrochemical workstation and the constant-temperature solution supply system. The test conditions are accurate and controllable, the automation degree of the device is high, the stress condition suffered by the pipeline in the operation process can be simulated by applying different forms of loads to the stress corrosion sample, and the stress condition is close to the real operation state of the pipeline.

This invention discloses a corrosion testing device and operating method for prestressed steel wire under tensile stress. The device includes a pair of partially grooved box girders, fixed by a support device. A pair of fixed box girders and a sliding box girder are installed between the two box girders. A corrosion testing device is provided between the fixed box girders, and a stress-relieving device is provided between the sliding box girders and one side of the fixed box girders. The prestressed steel wire passes through the sliding box girders, the pair of fixed box girders, and the stress-relieving device, and is fixed by anchors. This invention reduces prestress loss after tensioning, ensuring the prestressed steel wire maintains its stress state. Furthermore, it allows for easier unloading of the prestressed steel wire after the corrosion test, and the stress-relieving device can be recycled.

The utility model discloses a sealing corrosion testing device for a corrosion-resistant magnetic fluid, and relates to the technical field of testing devices. The sealing corrosion testing device for the corrosion-resistant magnetic fluid comprises a testing cylinder, and the interior of the testing cylinder is filled with the magnetic fluid; the spraying assembly comprises a rotating rod which is rotationally arranged on the inner top wall of the testing cylinder and extends to the upper surface of the testing cylinder, and a cylindrical cavity is formed in the rotating rod. By arranging the spraying assembly and the pressurizing box, when the device is used for testing the corrosion resistance of the magnetofluid, the magnetofluid can be more fully contacted with a salt mist solution containing copper ions in the testing process, and the salt mist solution containing the copper ions, which contains 5 percent (+ / -0.5 percent) sodium chloride and 0.26 g / L (+ / -0.02 g / L) copper chloride, can induce corrosion, so that the corrosion resistance of the magnetofluid is improved, and the corrosion resistance of the magnetofluid is improved. The corrosion speed is eight times higher than that of a common salt mist solution, so that the test period is effectively shortened, and the test efficiency is improved.

The utility model relates to material performance detection test technical field, concretely relates to a tooling lifting appliance for stress corrosion test, for suspending test tooling in test container, include: two supports, with the opposite mode fixed on the inner wall of test container and distance test container bottom surface certain height, every support includes the mounting portion for with test container inner wall connection, the support forms the vertical positioning groove on its upper end. The utility model through setting up support in the inner wall of test container, the interlocking fixed between support and crossbeam, and between crossbeam and test tooling, connect through the tooling connecting structure that constitutes by sliding seat and connecting assembly, after test, put net solution directly dismounts crossbeam from support, can disposablely smoothly take out together with test tooling, can effectively eliminate the shaking brought by the rope, when taking out test tooling, natural vertical stability, not easy to sway and knock the inner wall of test container.

The application discloses a kind of air cooling island flow accelerated corrosion simulation test system and method, main loop subsystem, including high-purity water tank, main loop outlet pipe, electrode flow cell and main loop return pipe;The water outlet of high-purity water tank is connected with the one end of main loop outlet pipe, the other end of main loop outlet pipe is connected with the water inlet of electrode flow cell, the one end of main loop return pipe is connected with the water outlet of electrode flow cell, the other end of main loop return pipe is connected with the backwater of high-purity water tank;Dosing subsystem is used to add alkali agent or oxidizing agent to main loop outlet pipe;Flow accelerated corrosion test subsystem includes test electrode and corrosion tester;Test electrode is placed in electrode flow cell, and test electrode is connected with the input end of corrosion tester by wire;The material of test electrode is the same as the material of the equipment to be simulated air cooling island;The application realizes the real simulation of air cooling island equipment, meets the simulation of high flow rate and anaerobic condition, and the error of simulation test result is small.

Embodiments of the present disclosure relate to the technical field of testing corrosion resistance of materials, and specifically to a system and method for performing a supercritical CO2 corrosion test. The system for performing a supercritical CO2 corrosion test includes a sample loading device, a pressure regulating valve, and an auxiliary pressure regulating member. The sample loading device is configured to have a sample chamber for accommodating a sample, where the sample chamber is further configured to receive a supercritical CO2 fluid so that the sample in the sample chamber undergoes a corrosion test under a supercritical CO2 atmosphere. The pressure regulating valve is disposed downstream of the sample chamber along a flow direction of the supercritical CO2 fluid to regulate a pressure inside the sample chamber so that the sample in the sample chamber is tested under a first preset pressure. The auxiliary pressure regulating member is configured to increase a pressure at an outlet of the pressure regulating valve. According to embodiments of the present disclosure, by providing the auxiliary pressure regulating member, the pressure difference between the inlet and outlet of the pressure regulating valve is reduced, ensuring a precise regulation of the pressure inside the sample chamber by the pressure regulating valve.

The invention discloses a cyclic load and electrochemistry collaborative testing device and a testing method, and belongs to the technical field of material corrosion and mechanical property testing. The device comprises a load applying unit, an electrochemical testing unit, a sample clamp and corrosion pool unit and a data synchronization control module. The test method comprises the steps of sample preparation, device assembly, static electrochemical test and electrochemical collaborative test under cyclic load. The core of the invention lies in that through the data synchronization control module, the electrochemical test is accurately controlled to be triggered when the cyclic load reaches a peak value, and in-situ and synchronous coupling of a dynamic stress field and a corrosion environment is realized. According to the method, the defect that fatigue and corrosion tests are separated in the prior art is overcome, the complex working condition of the material in actual service can be truly reduced, the acceleration or inhibition effect of cyclic stress on the surface corrosion behavior of the material is accurately represented, and the research and evaluation precision of the corrosion fatigue performance and failure mechanism of the material is remarkably improved.

The embodiment of the present application discloses a kind of stress corrosion test fixture and test method.The fixture includes stress simulation component and stress adjusting component.Stress simulation component includes needle valve unit, spring seat and telescopic spring, both sides of spring seat are respectively connected with telescopic spring and needle valve unit, the side of needle valve unit away from spring seat is used to be mutually abutted with test piece.Stress adjusting component includes fixture shell and stress loading unit connected on fixture shell, fixture shell and stress loading unit form the cavity of containing stress simulation component, stress loading unit includes sliding mechanism and positioning mechanism.The fixture provides preload according to stress simulation component, and controls telescopic spring telescopic feed quantity by stress adjusting component, to ensure that test piece is subjected to always stable preload, guarantee the consistency and accuracy of stress corrosion test.The method can accurately and effectively evaluate the stress corrosion resistance of valve seat and valve sleeve welding assembly of oil sprayer.

The application relates to a high-throughput testing device and method for simulating the crevice corrosion of spent fuel reprocessing boiling nitric acid, and belongs to the field of spent fuel reprocessing boiling nitric acid corrosion testing devices. The device combines continuously changing crevice widths with wire beam electrodes, so that each rod-shaped sample corresponds to different crevice widths, and the crevice corrosion electrochemical signals under different crevice widths are monitored at one time. Therefore, the device can capture the corrosion signals of a micro area, obtain the corrosion rules under different crevice widths, complete high-throughput electrochemical testing, integrate the signals captured by each micro electrode, and obtain the corrosion condition of the whole material. Meanwhile, polytetrafluoroethylene is used as raw material to manufacture a top wire, a bolt, a nut and a bottom support in the device, the device has good electric insulation performance and strong corrosion resistance, and can meet the electrochemical experiment under a high-temperature concentrated nitric acid environment for a long time. The simulation and research of the crevice corrosion under the boiling concentrated nitric acid environment are realized.

The invention belongs to the technical field of new material detection, and discloses an orthodontic correction arch wire friction corrosion test system, which comprises a controller, a mechanical excitation device and an electrochemical workstation, and is characterized in that the controller controls the electrochemical workstation to apply polarization pulses to form an ion sheath for neutralizing friction charges; the method comprises the following steps: firstly, carrying out mechanical damage and electrochemical response on the surface of a material, then controlling a mechanical excitation device to apply single instantaneous mechanical scratch, immediately triggering an electrochemical workstation after the scratch is finished, and recording an electrochemical relaxation transient process of spontaneous repassivation of the surface of the material in a static environment without mechanical interference. The technical problem that the dynamic repairing capacity of the material cannot be accurately evaluated due to signal aliasing in an existing continuous friction test is solved, and the obtained data is no longer a fuzzy average value but a clear dynamic fingerprint containing rich physical mechanisms.