Device and method for testing corrosion resistance of material in variable coupling environment

Abstract

The invention discloses a device and a method for testing corrosion resistance of a material under a variable coupling environment, and relates to the technical field of material corrosion resistance testing, the device comprises a temperature control system, a coupling environment simulation system, a clamping system and an observation testing system, the coupling environment simulation system comprises an environment simulation cabin and a coupling atmosphere controller, the clamping system is located in the environment simulation cabin and used for clamping a plurality of to-be-tested samples, the heating end of the temperature control system is connected to the environment simulation cabin, the temperature control system can adjust the temperature of the to-be-tested samples in the environment simulation cabin, and the coupling atmosphere controller can adjust the atmosphere proportion in the environment simulation cabin. The observation test system is located outside the environment simulation cabin, an observation window is arranged on one side, close to the observation test system, of the environment simulation cabin, and the observation test system is used for observing the corrosion state of the to-be-tested sample through the observation window. The simulation environment can be adjusted in the test process, and the accuracy and the test efficiency of the test structure are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material corrosion resistance testing, and in particular to a device and method for testing material corrosion resistance in a variable coupling environment. Background Art

[0002] The development of strategic emerging materials for aerospace applications requires extensive early-stage performance testing. During these tests, simulating real-world service environments is crucial to assessing their impact on various material properties. This is crucial for ensuring the safety of aerospace materials in service. Currently, simulations of aerospace service environments primarily focus on high temperatures, ultra-high temperatures, and vacuum environments. There is no research on simulating the variable, multi-factor coupled environments experienced by aircraft engines during liftoff. Summary of the Invention

[0003] The purpose of the present invention is to provide a testing device and method for the corrosion resistance of materials under a variable coupling environment, so as to solve the problems existing in the above-mentioned prior art, realize the adjustment of the simulation environment during the test process, and improve the accuracy of the test structure and the test efficiency.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a testing device for the corrosion resistance of materials under a variable coupling environment, comprising a temperature control system, a coupling environment simulation system, a clamping system and an observation test system. The coupling environment simulation system comprises an environmental simulation cabin and a coupling atmosphere controller. The clamping system is located in the environmental simulation cabin, and the clamping system is used to clamp multiple samples to be tested. The heating end of the temperature control system is connected to the environmental simulation cabin, and the temperature control system can adjust the temperature of the samples to be tested in the environmental simulation cabin. The coupling atmosphere controller can adjust the atmosphere ratio in the environmental simulation cabin. The observation test system is located outside the environmental simulation cabin, and the environmental simulation cabin is provided with an observation window on a side close to the observation test system. The observation test system is used to observe the corrosion state of the samples to be tested through the observation window.

[0006] Preferably, the temperature control system includes a power-on end, the heating end, a temperature measuring element and a temperature control element, the power-on end is electrically connected to the heating end, the heating end and the temperature measuring element are both used to be set close to the sample to be tested, and the power-on end and the temperature measuring element are both electrically connected to the temperature control element.

[0007] Preferably, the heating end is an energized coil.

[0008] Preferably, the temperature control system further comprises a radiation tube, which is inductively connected to the energized coil and is used to cover the periphery of the sample to be tested.

[0009] Preferably, the radiation tube is made of precious metal material.

[0010] Preferably, the temperature measuring element includes a thermocouple and a photoelectric colorimeter, the thermocouple is used to be set close to the sample to be measured, the photoelectric colorimeter is set outside the environmental simulation chamber, and the thermocouple and the photoelectric colorimeter are both electrically connected to the temperature control element.

[0011] Preferably, the environmental simulation cabin is semi-enclosed, and the environmental simulation cabin is a glass cover with an outlet provided on the glass cover.

[0012] Preferably, the clamping system includes a plurality of clamp trays stacked up and down, each of the clamp trays is provided with a plurality of clamp grooves on its upper surface, the clamp grooves are used to place samples to be tested, and an observation distance is provided between adjacent clamp trays.

[0013] The present invention also provides a method for testing the corrosion resistance of a material under a variable coupling environment, using the device for testing the corrosion resistance of a material under a variable coupling environment described in any one of the above technical solutions, comprising the following steps:

[0014] S1. Load multiple test samples onto the clamping system and place the clamping system in an environmental simulation chamber;

[0015] S2. Place the clamping system in the middle of the heating end; and choose whether to use a radiation tube based on the material of the sample to be tested and the required temperature;

[0016] S3. According to the preset service environment, adjust the ratio of inert gas, oxygen and water vapor introduced into the environmental simulation chamber by the coupled atmosphere controller, pre-introduce for half an hour, and adjust the environment in the environmental simulation chamber to the preset service environment;

[0017] S4. Place the temperature measuring element close to the clamping system;

[0018] S5. The temperature control element is set to a predetermined temperature, and the energized end is controlled to energize the heating end, causing the heating end to start heating to the predetermined temperature. During this process, the service environment of the test sample during the launch phase is simulated, and the observation test system is used to observe and record the process.

[0019] S6. The temperature control element controls the energized end to continue operating and maintain the temperature for 30 minutes, simulating the service environment of the test sample during the air maintenance phase. The test system observes and records the results.

[0020] S7. The temperature control element stops the energized end and cools the sample to room temperature, simulating the service environment of the sample during the landing phase. The observation and recording are performed by the observation test system.

[0021] S8. Save the test data, stop the introduction of inert gas, oxygen and water vapor, remove the sample to be tested and the clamping system, and close the entire test device for the corrosion resistance of materials under the variable coupling environment.

[0022] Preferably, in S3, the calculation method of the ratio of inert gas, oxygen and water vapor introduced into the environment simulation chamber by the coupled atmosphere controller is: the volume of the simulated environment chamber is known to be V, and the ratio of the gas content required for the simulated atmospheric height is X:M:N, wherein X is the inert gas content, M is the oxygen content, and N is the water vapor content, and the flow ratio and volume ratio of the gas required for the simulated atmospheric height are equal, V X :V M :V N =X:M:N, where V X is the volume of inert gas, V M is the volume of oxygen, V N is the volume of water vapor;

[0023] The volume of water vapor V N The formula for changes with temperature T is:

[0024] V N =218.019*T-277.7525

[0025] Oxygen volume V M The relationship between the oxygen content M is:

[0026]

[0027] Inert gas volume V X The relationship between the inert gas content X is:

[0028]

[0029] Compared with the prior art, the present invention has achieved the following technical effects:

[0030] The device and method for testing the corrosion resistance of materials under a variable coupling environment provided by the present invention are intended to simulate the actual service environment of advanced materials used in aerospace engines at high altitudes and observe the corrosion effects. By designing a temperature control system, a coupling environment simulation system, a clamping system, and an observation and testing system, a high-temperature water-oxygen corrosion environment is simulated, and the atmosphere ratio in the environmental simulation cabin is adjusted in real time to make the simulated corrosion environment closer to the actual atmospheric environment, thereby realizing the corrosion resistance performance test of the sample to be tested.

[0031] Furthermore, the clamping system in the present invention is designed to include multiple clamp trays stacked up and down, and each clamp tray has a plurality of clamp grooves on its upper surface, each clamp groove is used to place the sample to be tested, thereby enabling multiple samples to be tested to undergo service environment simulation tests at the same time. Compared with traditional clamps that can only clamp a single sample, the clamping system in the present invention greatly improves the test efficiency and also reduces costs.

[0032] Furthermore, the present invention provides an observation spacing between adjacent fixture trays, and by reasonably setting the observation spacing and the stacking of the fixture trays, it is convenient to reserve observation space, thereby ensuring that the observation and testing system can smoothly observe the surface corrosion of the sample to be tested.

[0033] Furthermore, the fixture tray in the present invention can also be set to be transparent as needed to facilitate observation of the samples to be tested. At the same time, the fixture tray is made of high-temperature resistant and corrosion-resistant alloy materials. Depending on the shape of the samples to be tested and the test coupling environment, fixture trays of different shapes can be designed to achieve high-throughput, multi-sample testing, greatly improving the test efficiency.

[0034] Furthermore, the present invention designs the environmental simulation chamber to have an observation window on a side close to the observation test system. At the same time, since the environmental simulation chamber and the fixture are both designed to be transparent, it is convenient to observe the sample to be tested.

[0035] Furthermore, the observation part of the observation test system of the present invention can be composed of a camera, a video camera, and a video extensometer, so that the corrosion condition of the sample to be tested can be directly observed and recorded through the observation window.

[0036] Furthermore, the present invention designs an energized coil and adopts electromagnetic induction heating to heat the sample to be tested. Compared with the traditional resistance wire and silicon molybdenum rod radiation heating method, it can achieve a faster heating rate and is not affected by the corrosive environment. Compared with the traditional energized graphite radiation heating that will gradually oxidize and disappear in a high-temperature water and oxygen environment, the energized coil in the present invention can simulate the material in a high-temperature atmospheric environment, and thus can adapt to the actual service conditions of the simulated material in the present invention in a high-altitude atmospheric environment where the internal temperature rises rapidly, thereby achieving rapid heating of the sample to be tested and effective simulation of the high-temperature service environment of the material.

[0037] Furthermore, when the present invention is used to heat conductive test samples such as high-temperature alloys, the test samples can be placed in parallel in an energized coil, and the energized coil is used to directly heat the test samples by electromagnetic induction; when used to heat non-conductive test samples such as advanced structural ceramics and composite materials, a conductive radiation tube is placed between the energized coil and the test sample, and the radiation tube is heated by electromagnetic induction, and the radiation tube radiates and heats the test sample to achieve rapid heating. Compared with traditional heating methods, this method is not restricted by whether the test sample is conductive, and can achieve rapid heating.

[0038] Furthermore, the present invention can prevent the energized coil from softening and failing due to excessive temperature by providing a water cooling device at the energized coil.

[0039] Furthermore, the present invention designs the environmental simulation chamber as a quartz glass cover, which isolates the environment inside and outside the environmental simulation chamber without affecting the observation of the sample to be tested. The flow rates of inert gas and oxygen are controlled by flow meters, while water vapor is generated by heating pure water with a superheated steam heater. By controlling the water flow rate, the water vapor intake flow rate is controlled to ensure that the inert gas, oxygen and water vapor reach the specified ratio.

[0040] Furthermore, the present invention adjusts the atmosphere ratio in the environmental simulation chamber by coupling an atmosphere controller, and then accurately simulates the atmospheric water and oxygen environments at different altitudes by adjusting different atmosphere ratios in real time, making the simulated environment closer to the real atmospheric environment. That is, according to different altitudes, the atmospheric atmosphere ratios and concentrations are different, and according to the specific service mode of the material, an environmental simulation program is set, and the different atmosphere ratios are adjusted in real time by coupling an atmosphere controller, the gas ratios and concentrations in the environmental simulation chamber are changed, and the atmospheric environments at different altitudes are simulated to achieve the adjustment of different ratios of X:M:N, where X is the inert gas content, M is the oxygen content, and N is the water vapor content; by adjusting these different ratios, accurate simulation of the atmospheric water and oxygen environments at different altitudes is achieved, filling the gap in the existing technology regarding simulation devices and methods for high-temperature and high-altitude atmospheric environments.

[0041] Furthermore, in actual application of the present invention, the flow of inert gas and oxygen is controlled by a coupled atmosphere controller, and water vapor is generated by heating pure water by a water vapor generator. By controlling the water flow, the water vapor intake flow is controlled to ensure that the inert gas, oxygen, and water vapor reach the specified ratio, and through

[0042] Furthermore, the present invention provides a heating tape in the air inlet pipe of the environmental simulation cabin, and the temperature of the heating tape is not lower than 100° C., thereby avoiding inaccurate ratios caused by condensation.

[0043] Furthermore, in order to ensure the accuracy of temperature, the present invention adopts a method of jointly controlling the temperature by a thermocouple and a photoelectric colorimeter on the basis of the traditional method of using a thermocouple alone to control the temperature. At the same time, in order to ensure the temperature measurement accuracy, the thermocouple is designed to be bundled and fixed on the sample surface, and the photoelectric colorimeter is used to directly align with the sample surface for testing and controlling the temperature. In order to prevent the thermocouple from corrosion and damage, a ceramic-coated thermocouple is used to prevent the thermocouple wire from being affected by corrosion to a limited extent. Compared with the traditional temperature control method of using a thermocouple alone to control the temperature, the present invention adopts a method of jointly controlling the temperature by a thermocouple and a photoelectric colorimeter to effectively improve the accuracy of the temperature of the sample to be measured.

[0044] The present invention provides a device and method for testing the corrosion resistance of materials under a variable coupling environment. Through the combined action of a coupling atmosphere controller and a temperature control system, and in conjunction with the design of a clamping system and an observation and testing system, the various systems work together to ultimately simulate a water-oxygen corrosion environment under a high-temperature state, so that the simulated environment in the environmental simulation cabin is closer to the real atmospheric corrosion environment, facilitating the corrosion resistance test of the sample to be tested, and providing coupled environment simulations such as different temperatures and variable atmosphere environments for the research and development of strategic emerging materials for aerospace, and capable of performing long-term aging and corrosion tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] Figure 1 This is a schematic structural diagram of a device for testing the corrosion resistance of materials under a variable coupling environment in Example 1;

[0047] Figure 2 A top view of the fixture tray in Example 1;

[0048] Figure 3 Schematic diagram of the stacking method of the fixture trays in Example 1;

[0049] In the figure: 1-temperature control system, 2-energized coil, 3-fixture tray, 4-temperature measuring element, 5-coupled atmosphere controller, 6-environmental simulation chamber, 7-sample to be tested. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] The purpose of the present invention is to provide a testing device and method for the corrosion resistance of materials under a variable coupling environment, so as to solve the problems existing in the prior art, realize the adjustment of the simulation environment during the test process, and improve the accuracy of the test structure and the test efficiency.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] Example 1

[0054] like Figure 1-Figure 3 As shown, this embodiment provides a testing device for the corrosion resistance of materials in a variable coupling environment, including a temperature control system 1, a coupling environment simulation system, a clamping system and an observation test system. The coupling environment simulation system includes an environmental simulation cabin 6 and a coupling atmosphere controller 5. The clamping system is located in the environmental simulation cabin 6. The clamping system adopts a high-temperature water-oxygen corrosion-resistant and high-throughput design, and the clamping system is used to clamp multiple samples 7 to be tested, thereby enabling multiple samples 7 to be tested to undergo service environment simulation tests at the same time. Compared with traditional clamps that can only clamp a single sample, the clamping system in this embodiment greatly improves the test efficiency and reduces costs. The heating end of the temperature control system 1 is connected to the environmental simulation cabin 6, and the temperature control system 1 can adjust the temperature of the sample 7 to be tested in the environmental simulation cabin 6. The temperature control system 1 adopts electromagnetic induction heating to heat The sample to be tested 7 can achieve rapid temperature rise of the sample to be tested 7, and effectively simulate the high-temperature environment of the material service. The coupled atmosphere controller 5 can adjust the atmosphere ratio in the environmental simulation chamber 6. By adjusting different atmosphere ratios in real time, it can simulate atmospheric environments at different altitudes, making the simulated environment closer to the real atmospheric environment. At the same time, working together with the temperature control system 1, it can simulate the water-oxygen corrosion environment under high temperature. The observation test system is located outside the environmental simulation chamber 6, and the environmental simulation chamber 6 is provided with an observation window on the side close to the observation test system. The observation test system is used to observe the corrosion state of the sample to be tested 7 through the observation window, so as to realize the corrosion resistance test of the sample to be tested 7. At the same time, the observation test system can also be set to be movable, so that the surface deformation of the sample to be tested 7 can be observed from multiple directions by moving the observation test system. Through the above design, coupled environmental simulations such as different temperatures and variable atmosphere environments are provided for the research and development of strategic emerging materials in aerospace, and long-term aging and corrosion tests can be performed.

[0055] In the optional scheme of this embodiment, it is more preferred that the temperature control system 1 includes a power-on end, a heating end, a temperature measuring element 4 and a temperature control element. The power-on end is electrically connected to the heating end so that the heating end is energized through the power-on end so that the heating end can be heated. The heating end and the temperature measuring element 4 are both used to be set close to the sample to be tested 7 to heat and measure the temperature of the sample to be tested 7. The power-on end and the temperature measuring element 4 are both electrically connected to the temperature control element, and then the temperature signal around the sample to be tested 7 is transmitted to the temperature control element through the temperature measuring element 4, and the temperature control element controls whether the power-on end is working or not.

[0056] In the optional scheme of this embodiment, it is more preferred that the heating end is an energized coil 2, and the energized coil 2 is energized through the energized end to achieve heating of the sample 7 through the energized coil 2, which can achieve rapid temperature rise. At the same time, those skilled in the art can set the energized coil 2 inside or outside the environmental simulation chamber 6 according to actual needs. In this embodiment, by designing the energized coil 2, the sample 7 to be tested is heated by electromagnetic induction heating. Compared with the traditional resistance wire and silicon molybdenum rod radiation heating method, the energized coil 2 can achieve a faster heating rate and is not affected by the corrosive environment. Compared with the traditional energized graphite radiation heating that will gradually oxidize and disappear in a high-temperature water and oxygen environment, it can achieve the simulation of the sample 7 to be tested in an ultra-high temperature vacuum environment, and thus can adapt to the actual service situation of the sample 7 to be tested in this embodiment in a high-altitude atmospheric environment where the internal temperature rises rapidly, and achieve rapid heating of the sample 7 to be tested, as well as effective simulation of the high-temperature service environment of the material.

[0057] In the optional scheme of this embodiment, it is more preferred that the temperature control system 1 also includes a radiation tube, which is inductively connected to the energized coil 2, and the radiation tube is used to cover the periphery of the sample to be tested 7, and then heat the sample to be tested 7 through the radiation tube. This heating method is mainly suitable for heating non-conductive materials.

[0058] Among the optional solutions of this embodiment, it is more preferred that when the sample to be tested 7 is a conductive emerging material, such as carbon / carbon composite materials, high-temperature alloys, etc., the radiation tube may not be set, and the sample to be tested 7 can be directly placed in parallel in the energized coil 2, and the energized coil 2 is used to directly heat the sample to be tested 7 by electromagnetic induction to achieve rapid heating.

[0059] Among the alternatives of this embodiment, the radiation tube is preferably made of a precious metal. When the sample 7 to be tested is a non-conductive material such as advanced structural ceramics or composite materials, the radiation tube made of the precious metal is induced by the energized coil 2, and then radiated and heated by the radiation tube, achieving rapid temperature increase. The radiation tube is made of precious metal for its excellent conductivity and corrosion resistance.

[0060] Among the alternatives in this embodiment, the preferred method for heating the test sample 7 is traditional heating using resistance wires or silicon-molybdenum rods for radiation heating. This method suffers from slow heating rates and the susceptibility of the heating wires to corrosive environments. Some methods also employ energized graphite radiation heating, which can simulate materials in ultra-high-temperature vacuum environments. However, energized graphite radiation heating cannot be applied in high-temperature water-oxygen environments because the graphite gradually oxidizes and disappears. Therefore, to simulate the rapid internal heating of materials in an aerospace engine at high altitudes, this embodiment uses an energized coil 2 to heat the test sample 7 by electromagnetic induction. Placing the test sample 7 within the energized coil 2 allows for rapid heating of the test sample 7 through the principle of electromagnetic induction, effectively simulating the high-temperature service environment of the test sample 7. Furthermore, the energized coil 2 is equipped with a water cooling device to prevent overheating and softening of the energized coil 2.

[0061] In the optional scheme of this embodiment, it is more preferred that the temperature measuring element 4 includes a thermocouple and a photoelectric colorimeter. The thermocouple is used to be set close to the sample to be tested 7, and the photoelectric colorimeter is set outside the environmental simulation chamber 6. Both the thermocouple and the photoelectric colorimeter are electrically connected to the temperature control element. By combining the thermocouple and the photoelectric colorimeter, the temperature environment of the sample to be tested 7 is tested, and then the temperature control element is used to increase and decrease the temperature in real time to ensure the accuracy of the temperature. Compared with the traditional technical solution of using a thermocouple to control the temperature alone, this embodiment effectively improves the accuracy of the temperature of the sample to be tested 7 by adopting a thermocouple and a photoelectric colorimeter to control the temperature together. Moreover, in actual application, the thermocouple can be bundled and fixed on the surface of the sample to be tested 7. To prevent the thermocouple from corrosion and damage, a ceramic-coated thermocouple is used to prevent the thermocouple wire from being affected by corrosion. At the same time, for the non-conductive sample to be tested 7 that needs to be set inside the radiation tube for heating, this embodiment can open a hole in the middle of the radiation tube and use a photoelectric colorimeter to directly align the surface of the sample to be tested 7 to test and control the temperature.

[0062] In the optional scheme of this embodiment, it is more preferred that the environmental simulation cabin 6 is semi-enclosed, and the environmental simulation cabin 6 is a glass cover, which isolates the environment inside and outside the environmental simulation cabin without affecting the observation of the sample to be tested. An outlet is provided on the glass cover to ensure that the pressure in the environmental simulation cabin 6 is constant, and thus can ensure that the coupled atmosphere controller 5 can smoothly supply oxygen, inert gas and water vapor to the environmental simulation cabin 6, so that the environmental simulation cabin 6 is always in the required water and oxygen environment.

[0063] Among the optional schemes of this embodiment, it is more preferred to automatically adjust the proportions of special atmospheres such as water vapor, oxygen, argon, and nitrogen by coupling the atmosphere controller 5, and then control the gas environment in the environmental simulation chamber 6 to achieve simulation of the atmospheric water and oxygen environment during the material service process. At the same time, in conjunction with the semi-closed environmental simulation chamber 6, by introducing inert gas, water vapor and oxygen into the environmental simulation chamber 6 and controlling the gas flow rate, the material service environment is effectively simulated in the environmental simulation chamber 6, so that the internal and external atmospheric environments of the environmental simulation chamber 6 do not affect each other, thereby achieving the simulation of the real service environment of the material. This embodiment realizes the simulation of atmospheric water and oxygen environments at different altitudes by designing a coupled atmosphere controller 5, and adapts to the differences in atmosphere ratios at different altitudes. At the same time, several atmosphere ratio values ​​can be preset in the coupled atmosphere controller 5 according to the atmosphere ratio at the actual altitude. When it is necessary to simulate the water and oxygen environment at different altitudes, the corresponding atmosphere ratio (i.e., X:M:N, where X is the inert gas content, M is the oxygen content, and N is the water vapor content) can be automatically controlled to simulate the atmospheric environment at different altitudes. At the same time, in conjunction with the design of the temperature control system 1, multiple temperature values ​​at different altitudes can also be preset in the temperature control system 1, thereby realizing high-temperature water and oxygen corrosion environment simulation.

[0064] Since the main components of the atmosphere are nitrogen, oxygen, argon, carbon dioxide, and water vapor, among others, high temperature, oxygen, and water vapor are the primary corrosive agents for the sample 7 under test. However, prior art research has yet to address the simulation of high-temperature, high-altitude atmospheric environments. Therefore, to achieve this atmospheric environment simulation, this embodiment introduces inert gases, oxygen, and water vapor, and can adjust the ratios to accurately simulate atmospheric water and oxygen environments at different altitudes. The environmental simulation chamber 6 is glass-covered and made of quartz, thus isolating the internal and external environments of the chamber 6 without affecting the observation of the sample. When the inert gas introduced is argon, both the argon and oxygen flow rates are controlled by flowmeters, while the water vapor is generated by heating pure water in a superheated steam heater. Controlling the water flow rate, and thus the water vapor intake flow rate, ensures that the argon, oxygen, and water vapor ratios are maintained at the specified levels. Heating tape is installed around the intake pipe, bellows, and other relevant locations. It's wrapped around the outer circumference of the corresponding pipe and kept at a temperature of no less than 100°C to prevent condensation and inaccurate ratios. During gas flow, energized coil 2 continuously heats and maintains a high temperature for the test sample 7, accurately simulating the high-temperature water-oxygen environment in which the test sample 7 operates.

[0065] In the optional scheme of this embodiment, it is more preferred that the clamping system includes a plurality of clamp trays 3 stacked up and down, and each clamp tray 3 has a plurality of clamp grooves on its upper surface, and the clamp grooves are used to place the samples to be tested 7, so that environmental simulation and testing of multiple samples to be tested 7 can be performed simultaneously, and observation spacing is provided between adjacent clamp trays 3. By reasonably setting the observation spacing and the stacking of the clamp trays 3, it is convenient to reserve observation space to ensure that the observation test system can smoothly observe the surface corrosion of the samples to be tested 7. At the same time, the clamp tray 3 can also be set to transparent as needed to facilitate the observation of the samples to be tested 7. The clamp tray 3 is made of high-temperature resistant and corrosion-resistant alloy material. According to the shape of the sample to be tested 7 and the test coupling environment, clamp trays 3 of different shapes can be designed to achieve high-throughput, multi-sample testing, which greatly improves the test efficiency.

[0066] Example 2

[0067] This embodiment provides a method for testing the corrosion resistance of a material under a variable coupling environment, using the device for testing the corrosion resistance of a material under a variable coupling environment in the first embodiment, including the following steps:

[0068] S1. Load a variety of test samples 7 onto the clamping system and place the clamping system in the environmental simulation chamber 6;

[0069] S2. The clamping system is placed in the middle of the heating end; and according to the material and desired temperature of the sample to be tested 7, choose whether to use the radiation tube;

[0070] S3. According to the preset service environment, adjust the coupling atmosphere controller 5 to the environmental simulation chamber 6 into the ratio of inert gas, oxygen and water vapor, pre-introduced for half an hour, and the environment simulation chamber 6 is adjusted to the preset service environment;

[0071] S4. The temperature measuring element 4 is close to the clamping system;

[0072] S5. The temperature control element is set to a predetermined temperature, and the energized end is controlled to energize the heating end, so that the heating end starts working and heats up to a predetermined temperature. In this process, the service environment of the test sample 7 is simulated during the launch phase, and the test system is observed and recorded.

[0073] S6. The temperature control element controls the energized end to continue working and maintains the temperature for 30 minutes, simulating the service environment of the test sample 7 in the air maintenance stage, and observes and records it through the observation test system;

[0074] S7. The temperature control element stops the energized end and cools the test sample 7 to room temperature, simulating the service environment of the test sample 7 during the landing phase. The test system observes and records the process. As a preferred solution, during the cooling process, in order to simulate the cooling time, a corresponding cooling element, such as a jacket, can be provided to accelerate the cooling process.

[0075] S8. Save the test data, stop introducing the inert gas, oxygen, and water vapor, remove the test sample 7 and the clamping system, and close the entire test device for the corrosion resistance of materials under a variable coupling environment.

[0076] In S3, the calculation method of the ratio of inert gas, oxygen and water vapor introduced into the environment simulation chamber 6 by the coupled atmosphere controller 5 is as follows: given that the volume of the simulated environment chamber 6 is V, the ratio of the gas content required for the simulated atmospheric height is X:M:N, where X is the inert gas content, M is the oxygen content, and N is the water vapor content, and the flow ratio and volume ratio of the gas required for the simulated atmospheric height are equal, V X :V M :V N =X:M:N, where V X is the volume of inert gas, V M is the volume of oxygen, V N is the volume of water vapor;

[0077] The volume of water vapor V N Affected by the temperature T, the volume of water vapor V N The formula for changes with temperature T is:

[0078] V N =218.019*T-277.7525

[0079] Oxygen volume V M The relationship between the oxygen content M is:

[0080]

[0081] Inert gas volume V X The relationship between the inert gas content X is:

[0082]

[0083] According to the above formula, corresponding program design can be performed to enable the coupled atmosphere controller 5 to control the ratio of inert gas, oxygen and water vapor introduced into the environmental simulation chamber 6 according to the gas content ratio required for the simulated atmospheric height.

[0084] As a specific embodiment, the test device for material corrosion resistance under a variable coupling environment in Example 1 is used to simulate the material in an altitude environment of 25 km. The actual state of the material service environment is required to be divided into three sections:

[0085] The first section is from the ground to an altitude of 25 km, where the temperature of the test sample 7 is raised from room temperature to 800°C for 4 minutes; the second section is maintained at an altitude of 25 km for 30 minutes, with the temperature of the test sample 7 at 800°C; the third section is from 25 km back to the ground, where the temperature is reduced from 800°C to room temperature for 9 minutes. At an altitude of 25 km, the concentration of the first atmosphere is 11 mg / L. Therefore, to simulate the environment, the first atmosphere content: the second atmosphere content is 1:129, which is the ratio of the first atmosphere to the second atmosphere introduction rate, where the first atmosphere is an inert gas and the second atmosphere is oxygen. Those skilled in the art can also make adaptive adjustments based on actual needs. The specific temperature settings and coupled atmosphere working procedures for each test process are shown in Tables 1-3:

[0086] Table 1 Temperature setting and coupled atmosphere working procedures during heating process

[0087] Heating process / min Start 1 2 3 4 Temperature / ℃ Room temperature 100 300 500 80 First atmosphere L / min 0.02 0.02 0.02 0.02 0.02 Second atmosphere L / min 0.08 0.7 1.3 2 2.58

[0088] Table 2 Temperature setting and coupling atmosphere working procedures during insulation process

[0089] Insulation process / min 30 Temperature / ℃ 800 First atmosphere L / min 0.02 Second atmosphere L / min 2.58

[0090] Table 3 Temperature setting and coupling atmosphere working procedures during cooling process

[0091] Cooling process / min Start 1 2 3 4 5 6 7 8 9 Temperature / ℃ 800 600 500 400 300 250 200 150 50 Room temperature First atmosphere L / min 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 Second atmosphere L / min 2.58 2.3 2.02 1.74 1.46 1.18 0.9 0.62 0.34 0.08

[0092] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A testing device for the corrosion resistance of materials under a variable coupling environment, characterized by: It includes a temperature control system, a coupled environmental simulation system, a clamping system and an observation and testing system. The coupled environmental simulation system includes an environmental simulation cabin and a coupled atmosphere controller. The clamping system is located in the environmental simulation cabin and is used to clamp a plurality of samples to be tested. The heating end of the temperature control system is connected to the environmental simulation cabin, and the temperature control system can adjust the temperature of the samples to be tested in the environmental simulation cabin. The coupled atmosphere controller can adjust the atmosphere ratio in the environmental simulation cabin. The observation and testing system is located outside the environmental simulation cabin, and the environmental simulation cabin is provided with an observation window on a side close to the observation and testing system. The observation and testing system is used to observe the corrosion state of the samples to be tested through the observation window.

2. The device for testing the corrosion resistance of materials under variable coupling environment according to claim 1, characterized in that: The temperature control system includes a power-on end, a heating end, a temperature measuring element and a temperature control element. The power-on end is electrically connected to the heating end. The heating end and the temperature measuring element are both used to be arranged close to the sample to be tested, and the power-on end and the temperature measuring element are both electrically connected to the temperature control element.

3. The device for testing the corrosion resistance of materials under variable coupling environment according to claim 2, characterized in that: The heating end is an energized coil.

4. The device for testing the corrosion resistance of materials under variable coupling environment according to claim 3, characterized in that: The temperature control system further comprises a radiation tube, which is inductively connected to the energized coil and is used to cover the periphery of the sample to be tested.

5. The device for testing the corrosion resistance of materials under variable coupling environment according to claim 4, characterized in that: The radiation tube is made of precious metal material.

6. The device for testing the corrosion resistance of materials under a variable coupling environment according to claim 2, characterized in that: The temperature measuring element comprises a thermocouple and a photoelectric colorimeter. The thermocouple is used to be arranged close to the sample to be measured, and the photoelectric colorimeter is arranged outside the environmental simulation chamber. Both the thermocouple and the photoelectric colorimeter are electrically connected to the temperature control element.

7. The device for testing the corrosion resistance of materials under a variable coupling environment according to claim 1, characterized in that: The environmental simulation cabin is semi-enclosed and is a glass cover with an exit arranged on the glass cover.

8. The device for testing the corrosion resistance of materials under a variable coupling environment according to claim 1, characterized in that: The clamping system comprises a plurality of clamp trays stacked up and down, each of the clamp trays has a plurality of clamp grooves on its upper surface, the clamp grooves are used to place samples to be tested, and an observation distance is provided between adjacent clamp trays.

9. A method for testing the corrosion resistance of materials under a variable coupling environment, characterized in that: The device for testing the corrosion resistance of materials under a variable coupling environment according to any one of claims 1 to 8 comprises the following steps: S1. Load a variety of samples to be tested onto the clamping system, and place the clamping system in an environmental simulation chamber; S2. Place the clamping system in the middle of the heating end; and choose whether to use the radiation tube according to the material of the sample to be tested and the required temperature; S3. According to the preset service environment, adjust the ratio of the coupled atmosphere controller to introduce inert gas, oxygen and water vapor into the environmental simulation chamber, introduce it for half an hour in advance, and adjust the environment in the environmental simulation chamber to the preset service environment; S4. Place the temperature measuring element close to the clamping system; S5. The temperature control element is set to a predetermined temperature, and the power supply end is controlled to supply power to the heating end, so that the heating end starts to work and heats up to a predetermined temperature. In this process, the service environment of the test sample during the launch phase is simulated, and the observation and recording are performed through the observation test system; S6. The temperature control element controls the energized end to continue working and keep the temperature for 30 minutes, simulating the service environment of the sample to be tested during the air maintenance stage, and observes and records through the observation test system; S7. The temperature control element controls the energized end to stop working and cools the sample to be tested to room temperature. In this process, the service environment of the sample to be tested during the landing stage is simulated, and the observation and recording are performed through the observation test system; S8. Save the test data, stop introducing inert gas, oxygen and water vapor, take out the sample to be tested and the clamping system, and close the entire test device for the corrosion resistance of materials under the variable coupling environment.

10. The method for testing the corrosion resistance of materials under a variable coupling environment according to claim 9, characterized in that: In S3, the calculation method of the ratio of inert gas, oxygen and water vapor introduced into the environment simulation chamber by the coupled atmosphere controller is: the volume of the simulated environment chamber is known to be V, and the gas content ratio required for the simulated atmospheric height is X:M:N, where X is the inert gas content, M is the oxygen content, and N is the water vapor content, and the flow ratio and volume ratio of the gas required for the simulated atmospheric height are equal, V X :V M :V N =X:M:N, where V X is the volume of inert gas, V M is the volume of oxygen, V N is the volume of water vapor; The water vapor volume V N The formula that changes with temperature T is: V N =218.019*T-277.7525 Oxygen volume V M The relationship between the oxygen content M is: Inert gas volume V X The relationship between the inert gas content X is:

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