Gas corrosion aging experiment device and method

Abstract

The invention discloses a gas corrosion aging experiment device and method. The gas corrosion aging experiment device comprises a sealing box, a reaction kettle and a bracket, a heat management system, a heating system and a cooling system are arranged in the sealing box; a plurality of reaction kettles are mounted in the sealing box; the reaction kettle comprises a reaction kettle cavity, the top of the reaction kettle cavity is connected with a sealing cover, an air inlet hole is formed in the bottom of the reaction kettle cavity, and an air outlet hole is formed in the top of the reaction kettle cavity; a support is arranged in the reaction kettle cavity and bears a to-be-tested resistor disc. Electro-thermal-chemical three-in-one coupling aging simulation of the resistor disc in a special gas environment is realized.

Description

Technical Field

[0001] This invention belongs to the field of high-voltage switchgear testing and relates to a gas corrosion aging test apparatus and method. Background Technology

[0002] Closing resistors are commonly used circuit protection devices in high-voltage switchgear. The resistor elements in these closing resistors are exposed to SF6 gas for extended periods, which can lead to long-term corrosion and a decrease in resistance. Furthermore, during switching, overvoltage causes microscopic partial discharge, generating significant heat and accelerating existing chemical reactions. Conventional gas corrosion detection equipment typically uses several gases under specific temperature and relative humidity conditions to accelerate the corrosion of materials or products, simulating the long-term aging process in real-world environments. However, due to the unique nature of the resistor elements' operation and the independence of their working environment, it is impossible to achieve a realistic accelerated aging simulation for resistor elements in high-voltage switching equipment.

[0003] Patent CN119044043A proposes a high-temperature, high-concentration hydrogen chloride corrosion testing device and method. This method involves heating in a tubular furnace, continuously introducing high-concentration hydrogen chloride gas through a gas cylinder to maintain a constant gas concentration within the furnace, and incorporating a post-treatment device to reduce environmental pollution and prevent personnel poisoning. However, due to space and cavity heating limitations within the tubular furnace, it is impossible to detect interference from factors such as resistance value measurement and intermittent high-voltage discharge, thus failing to accurately simulate the aging process of resistance elements during actual use. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a gas corrosion aging experimental device and method, which realizes the electro-thermal-chemical three-in-one coupled aging simulation of resistors in a special gas environment.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A gas corrosion aging test apparatus includes a sealed box, a reaction vessel, and a support. The sealed box is equipped with a thermal management system, a heating system, and a cooling system; multiple reaction vessels are installed inside the sealed box; each reaction vessel includes a reaction vessel cavity, a sealing cover connected to the top of the reaction vessel cavity, an air inlet at the bottom of the reaction vessel cavity, and an air outlet at the top of the reaction vessel cavity; a support is installed inside the reaction vessel cavity, and the support supports the resistor element to be tested.

[0006] Optionally, the inner wall of the reactor cavity and the inner surface of the sealing cover are coated with polytetrafluoroethylene; the sealing cover is provided with electrode extension holes, which are located at the edge of the sealing cover.

[0007] Optionally, the air inlet is provided with an air inlet connector, and the air inlet connector integrates at least six air inlet plugs; the air outlet is provided with an air outlet plug; the cross-sectional area of ​​the air outlet channel is 0.8 to 1.4 times the total cross-sectional area of ​​all channels in the air inlet area.

[0008] Optionally, the support includes a vertical structure and a horizontal structure; the vertical structure includes a spindle, an auxiliary rod, and a sliding collar; the electrode passes through an electrode extension hole and connects to the top of the spindle; the horizontal structure is a tray.

[0009] Optionally, the sliding collar is slidably connected to the main shaft; the tray is composed of multiple support plates arranged in a ring, with the inner end of the support plate hinged to the main shaft; one end of the auxiliary rod is hinged to the sliding collar, and the other end is hinged to the corresponding support plate; the tray has a horizontally unfolded state and a vertically retracted state on the main shaft.

[0010] Optionally, a spring pin is provided on the sliding collar, and a positioning groove is provided on the main shaft at the corresponding position of the sliding collar.

[0011] Optionally, there are multiple trays, arranged in pairs; in each group, the lower tray unfolds horizontally from bottom to top, and the upper tray unfolds horizontally from top to bottom; the gap between two trays in the same group after unfolding is consistent with the thickness of the resistor to be tested; the trays are provided with positioning grooves.

[0012] Optionally, the support is made of copper, and the outer side of the support is fully coated with a corrosion-resistant coating; the surface area of ​​the tray is no more than half of the cross-sectional area of ​​the reactor cavity; the support plates are spaced apart, and the contact area between the tray and the resistor under test is no more than half of the surface area of ​​the end face of the resistor under test.

[0013] A gas corrosion aging test method includes the following steps: Place the support into the reactor cavity, place the resistor to be tested on the support, connect the top of the support to the external power supply through the electrode extension hole, and install the sealing cover to the top of the reactor cavity. Corrosive gases enter from the bottom of the reactor chamber through the inlet and exit from the top through the outlet. The thermal management system is activated, heating is performed at the set rate by the heating system, the temperature is read in real time by the temperature monitoring sensor, and the ambient temperature inside the reactor chamber is adjusted by the cooling system.

[0014] Optionally, after the corrosive gas environment and temperature environment reach a steady state, an external high-voltage power supply is connected to the bracket through the electrode extension hole to apply a high-voltage pulse or current to the resistor under test; the other end of the external electrode is connected to the detection circuit to collect the resistance data of the resistor under test.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention constructs a closed in-situ experimental system integrating thermal management, multi-channel gas ratio, and dynamic electrical loading. Utilizing a linkage support with excellent conductivity and corrosion resistance as a carrier, it achieves electro-thermal-chemical three-dimensional coupled aging simulation of resistance elements under a special gas environment within the reactor space. The reactor's inlet and outlet gas channels ensure the chemical stability of the corrosive atmosphere and a slightly positive pressure environment. Simultaneously, the expandable tray structure of the support maximizes the uniform distribution of airflow while ensuring reliable contact between the resistance elements and electrodes to simulate Joule heating and overvoltage impact. Finally, combined with an external detection circuit, it enables in-situ resistance monitoring throughout the aging process, completely overcoming the limitations of traditional equipment that cannot simulate complex coupled conditions and requires interruption of the experiment for measurement. This significantly improves the consistency between the accelerated aging mechanism and the actual operational failure mechanism. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the reactor cavity structure of the present invention; Figure 2 This is a schematic diagram of the reactor sealing cover structure of the present invention; Figure 3 This is a schematic diagram of the gas outlet plug structure of the reaction vessel of the present invention; Figure 4 This is a schematic diagram of the air inlet plug structure of the reaction vessel of the present invention; Figure 5 This is a schematic diagram of the reactor inlet group structure of the present invention; Wherein: 1-Reaction vessel cavity; 2-Exhaust port; 3-Inlet port; 4-Sealing cover; 5-Electrode extension hole; 6-Exhaust port plug; 7-Inlet port connector; 8-Inlet port plug. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0019] The gas corrosion aging test apparatus of the present invention includes a sealed box, a reaction vessel, and a support.

[0020] The sealed enclosure is equipped with a thermal management system, a heating system, and a cooling system.

[0021] The heating system consists of heating devices distributed in multiple locations, with a temperature regulation accuracy of at least 0.1℃. This system possesses powerful heating capabilities, covering a wide temperature range from room temperature to 400℃, used to simulate the overheating state of the resistance element under extreme fault conditions. Furthermore, the heating system supports controllable temperature rise profile settings, with a stable and adjustable heating rate. Test personnel can simulate the gradual transition from cold start to hot operation, or the sudden temperature rise caused by a fault, according to standard requirements.

[0022] The cooling system simulates the thermal fatigue effect of temperature alternation on materials. It comprises multiple cooling devices at various locations and points within a sealed chamber, with an adjustment accuracy of at least 0.1℃. The system enables stable, forced cooling and features a programmable cooling rate curve. This allows the system to execute complex programmed temperature control cycles (such as thermal shock tests) and, through real-time linkage with a temperature monitoring device, ensures the cooling process follows a preset trajectory, preventing unexpected physical breakage of the ceramic resistance element due to excessively rapid cooling.

[0023] The thermal management system includes an array of temperature monitoring sensors distributed at different heights and corners of the sealed enclosure. These sensors provide real-time feedback on the temperature field distribution within the chamber, eliminating errors from single-point measurements. Based on this real-time data, the thermal management system can perform closed-loop control of both the heating and cooling systems.

[0024] The thermal management system is not only responsible for data collection, but also plays the role of the control center. Based on the real-time temperature monitoring data of different areas in the chamber, it automatically calculates and adjusts the output power of the heaters in each area to compensate for the deviation of the thermal gradient caused by uneven gas flow or heat dissipation, and ensures that the temperature of each area is strictly maintained within the set tolerance range.

[0025] Inside the sealed enclosure, multiple identical cylindrical reactors are arranged side-by-side, either horizontally or vertically. These reactors are rigidly connected by fixtures mounted on the external sealed enclosure, with their bottom planes parallel to the bottom of the enclosure. This array design increases test throughput, allowing for simultaneous comparative testing of multiple samples under different or identical conditions in a single experiment. Each reactor is an independent physical and chemical reaction unit, and they are interconnected through parallel or series connections of gas and electrical circuits.

[0026] Regarding the gas supply system, the sources of various corrosive gases are located in a safe area outside the sealed enclosure, entering the interior of the enclosure through multiple sets of corrosion-resistant special pipelines passing through the outer wall. Inside the enclosure, these pipelines are distributed to the bottom inlet ports 3 of each reactor. After the gases complete the corrosion reaction process within the reactor, the waste gas carrying reaction byproducts is discharged from the outlet at the top of the reactor. To simplify the waste gas treatment process and ensure safety, the outlet pipelines of multiple reactors converge inside or outside the sealed enclosure, reconnecting to a single main pipeline, and ultimately introducing an additional waste gas treatment device for harmless neutralization and discharge.

[0027] In terms of the circuit system, the high-voltage power supply for simulating opening and closing operations and the detection circuit for measuring resistance are both deployed outside the sealed enclosure. Current is introduced into the enclosure through specially designed high-voltage insulated sealed terminals on the top or side walls, and then connected to the electrode extension holes 5 on the top cover of each reactor via flexible or rigid conductive connectors. This design effectively separates the high-voltage operating area from the chemical reaction area, ensuring operator safety and preventing corrosion of circuit components from corrosive gases.

[0028] Considering the extremely corrosive chemical properties of SF6 decomposition products (such as hydrogen fluoride HF and sulfur dioxide SO2), the inner wall of reactor chamber 1 is coated with a layer of polytetrafluoroethylene (PTFE). To ensure sufficient impermeability and service life, the coating is thicker than 0.1 mm. This coating not only resists the corrosion of acidic gases but also forms an insulating barrier on the inner wall of the chamber, preventing accidental arcing between the resistor element and the metal reactor body.

[0029] like Figure 1 As shown, the top of the reactor chamber 1 is open and connected to a sealing cap 4. The inner surface of the sealing cap 4 is coated with a corrosion-resistant coating to prevent damage from corrosive gases accumulated at the top. The sealing cap 4 is rigidly connected to the top of the reactor chamber 1 by mechanical means (including but not limited to precision threaded connections, external high-strength bolts, etc.). The overall structure after connection can withstand a gas pressure of at least 0.3 MPa.

[0030] like Figure 2As shown, the sealing cover 4 is provided with an electrode extension hole 5, which is located at the edge of the sealing cover 4.

[0031] An outlet plug 6 is installed inside the vent 2 near the top of the reactor. For example... Figure 3 and 4 As shown, the vent plug 6 includes an enlarged portion of the plug opening and an internal portion that connects to the air intake pipe. The enlarged portion is used to limit the insertion depth of the plug and provide an auxiliary seal; the internal portion of the plug is tightly connected to the air intake pipe, ensuring that there are no gaps between the external portion of the air intake pipe and the plug body, preventing gas bypass leakage; the outer wall of the plug forms a tight fit with the inner wall of the vent hole 2 on the sealing cap 4, preventing gas from passing through after connection.

[0032] An air inlet connector 7 is provided on the air inlet 3 near the bottom of the reactor, such as... Figure 5 As shown, the air inlet connector 7 integrates at least six air inlet plugs 8, each air inlet plug 8 is connected to an air outlet pipe, and each air outlet pipe can independently pass through a single gas. The structure of the air inlet plug 8 is basically similar to that of the air outlet plug 6, and it also includes an expansion part for sealing.

[0033] This multi-pipeline design allows researchers to mix SF6 gas in situ with other auxiliary gases (such as trace amounts of moisture, oxygen, or other specific decomposition product gases) before they enter the reaction zone, or to control the alternating introduction of different gases in a specific sequence. These outlet lines are constructed using corrosion-resistant rubber tubing.

[0034] The cross-sectional area of ​​the exhaust channel is at least 0.8 to 1.4 times the total cross-sectional area of ​​all channels in the inlet area. If the exhaust port is too large, the gas flow rate inside the reactor will be too fast, making it difficult to form a stable corrosive atmosphere on the surface of the resistor element and maintain a slightly positive pressure environment. If the exhaust port is too small, it may lead to excessive pressure buildup inside the reactor, increasing the risk of seal failure. The ratio range of 0.8 to 1.4 times precisely balances the requirements of gas exchange rate and pressure maintenance inside the reactor, ensuring stable kinetic conditions for the corrosion reaction. The exhaust channel is also connected to the external waste gas recovery system via a corrosion-resistant rubber tube, and the connection is also reinforced and sealed.

[0035] The reactor chamber 1 can accommodate at least three resistor plates, which are supported by a bracket and maintain sufficient physical spacing between them. Maintaining this spacing is not only to meet electrical insulation requirements and prevent inter-electrode flashover, but also to ensure that gas can flow freely between the resistor plates, avoiding dead airflow angles caused by overly dense arrangement, thereby ensuring that the surface of each resistor plate can be evenly contacted by corrosive gas.

[0036] The support frame is not only the physical carrier of the resistor elements, but also a path for current conduction and a conduit for airflow distribution. The entire support frame is constructed of copper, utilizing copper's excellent conductivity to ensure low-loss transmission during high-current testing. To resist corrosion from SF6 decomposition products, the entire outer surface of the support frame is coated with a corrosion-resistant coating. The dimensions of the support frame are custom-designed based on the specifications of existing resistor elements; different sizes of resistor elements correspond to different sizes of support frames to ensure a tight fit.

[0037] The support frame is made of metal and consists of two parts: a vertical structure and a horizontal structure. The vertical structure comprises a main shaft, auxiliary rods, and a sliding collar. Electrodes are inserted through electrode extension holes 5 on the edge of the sealing cover 4 and directly connected to the top of the main shaft for reaction and monitoring functions. The horizontal structure of the support frame is a tray with a sliding collar slidably connected to the main shaft. The tray consists of multiple support plates arranged in a ring, with the inner ends of the support plates hinged to the main shaft. The number of auxiliary rods corresponds to the number of support plates, and the multiple auxiliary rods are distributed in a ring. One end of each auxiliary rod is hinged to the sliding collar, and the other end is hinged to the corresponding support plate. By moving the sliding collar up and down, the tray unfolds into a horizontally unfolded state or a vertically retracted state with the support of the auxiliary rods. A spring pin is installed on the sliding collar. When the tray is in the horizontally unfolded state, it is perpendicular to the main shaft. The main shaft has a positioning groove at the position of the sliding collar, and the spring pin is inserted into the positioning groove to keep the tray in the horizontally unfolded state. When the tray needs to be retracted, force is applied to move the sliding collar, causing the spring pin to disengage from the positioning groove.

[0038] There are multiple trays, arranged in pairs. In each group, the lower tray unfolds horizontally from bottom to top, and the upper tray unfolds horizontally from top to bottom. The gap between the two trays in the same group after unfolding is equal to the thickness of the resistor sheet. The trays are equipped with positioning grooves to ensure that the center of the resistor sheet is aligned after placement.

[0039] The vertical structure of the support is designed to ensure maximum support strength and width. The horizontal structure of the support is the main current inlet interface. It is required that after the resistor is placed, the upper and lower horizontal structures can firmly clamp and support the weight of the resistor, forming the largest possible electrical contact area with the resistor's end face. To prevent excessive obstruction of airflow, the tray surface area is limited to no more than half of the cross-section of the reactor cavity, ensuring unobstructed gas flow in the vertical direction. To prevent the tray from excessively obstructing the resistor surface, thus preventing the covered area from participating in the corrosion reaction, the support plates in the tray are spaced apart, limiting the contact area between the tray and the resistor to no more than half of the resistor's end face surface area.

[0040] When folded up, the support frame can be inserted entirely through the top opening of the reactor. When unfolded, its uppermost tray is close to the reactor opening, and its lowermost tray is located in the lower middle part of the reactor, making full use of the reactor's vertical space.

[0041] The airflow entering from the bottom inlet of the reactor can evenly bypass the unfolded trays at each stage, fully contact the surface of each suspended resistor sheet, and finally exit from the top outlet, resulting in a smooth flow field.

[0042] The top of the spindle is connected to an external power source via the electrode outlet of the sealing cover 4. The entire bracket becomes a standalone, detachable electrode module.

[0043] In fixing and electrically connecting the resistor element, in addition to rigid metal trays, spring contacts can also be used. This involves setting a high-temperature resistant elastic probe or beryllium copper spring sheet on the tray surface. When the resistor element is pressed, the elastic deformation of the spring adapts to the unevenness of the resistor element's end face, ensuring reliable electrical contact.

[0044] Based on the above-mentioned gas corrosion aging test apparatus, the entire gas corrosion aging test includes the following process: Before the experiment begins, the operator first checks whether the PTFE coating on the inner wall of the reactor is intact. Then, the folded support is placed into the reactor, and the resistance element to be tested is placed on the support. As each resistance element is positioned, the tray unfolds and clamps the sample, forming a series-connected resistance element group; the top of the main shaft is connected to an external power supply through the electrode outlet of the sealing cover 4. Next, the sealing cover 4 is installed on top of the reactor, and the threads or locking bolts are tightened to ensure a tight fit between the sealing cover 4 and the reactor body.

[0045] Connect the inlet pipe at the bottom of the reactor to the external gas distribution system, and the outlet pipe at the top to the waste gas recovery main. According to the pre-set test plan, introduce SF6 gas into the reactor, or, to simulate a post-fault environment, introduce a mixed corrosive gas containing SO2, H2S, HF, etc. The gas enters from the bottom of the reactor, flows over the surface of the suspended resistor element, and then exits from the top.

[0046] Simultaneously, the thermal management system is activated. Temperature monitoring sensors begin reading the temperature at various points within the chamber in real time, and the heating system begins heating according to the set heating rate (e.g., 5°C / min). The cooling system is on standby, ready to balance overshoot temperatures by adjusting the flow rate of the cooling medium, ensuring that the ambient temperature inside the reactor is strictly maintained at the set value (e.g., 300°C), thereby accelerating the chemical corrosion reaction.

[0047] Once the gas and temperature environments reach a steady state, an electrical load is applied. An external high-voltage power supply is connected to the spindle through the electrode leads of the sealing cover 4. According to the test plan, high-voltage pulses or continuous high currents are periodically applied to the resistor element. This simulates the Joule heating effect during high-voltage switch closing and the overvoltage impact during switching. The high voltage may induce partial discharge at defects on the microscopic surface of the resistor element. The resulting high-energy electrons and heat further decompose the surrounding SF6 gas, exacerbating localized chemical corrosion and realistically replicating the harsh working conditions of electro-thermal-chemical coupled aging.

[0048] Throughout the aging process, the other end of the external electrode is connected to a closed detection circuit. This circuit intermittently provides a weak measuring current to acquire the resistance data of each resistor array in the reactor in real time. Because of the in-situ measurement technology, the experiment can be conducted without interruption or sample removal, allowing researchers to obtain a continuous curve of the resistor value changing over time. By analyzing the rate of resistance decrease, the inflection point, and the final failure mode, the failure mechanism of the resistor can be determined—whether it is due to cross-sectional reduction caused by chemical corrosion or microcrack propagation caused by electrothermal shock.

[0049] This embodiment couples three key aging factors in a laboratory environment: corrosion of SF6 and its decomposition products, Joule heating during the operation of the closing resistor, and operational overvoltage impact during the switching process. This greatly improves the consistency between the accelerated aging mechanism and the actual failure mechanism of the resistor element, making the test results more instructive.

[0050] Existing technologies such as tube furnaces have inflexible internal space utilization and limited sample placement methods. Our support system is compact when folded, facilitating placement into the reaction vessel; when extended, it fully utilizes the three-dimensional space of the reaction chamber, enabling multi-sample testing without significantly increasing equipment size. One device can handle multiple reaction vessels in parallel, achieving high-throughput testing.

[0051] In existing technologies, corrosion, heating, and electrical testing are often performed by different devices, requiring sample transfer, resulting in a discontinuous process and difficulty in in-situ monitoring. This embodiment constructs a complete system consisting of a sealed cavity, temperature control, gas path, circuit, and linkage support, achieving in-situ integrated completion of aging, loading, and monitoring (resistance). It is a dedicated, system-level solution, rather than a simple patchwork of multiple devices.

[0052] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0053] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0054] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0055] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0056] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

[0057] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A gas corrosion aging test apparatus, characterized in that, Includes a sealed box, a reaction vessel (1), and a support frame; The sealed box is equipped with a thermal management system, a heating system and a cooling system; multiple reaction vessels (1) are installed inside the sealed box; each reaction vessel (1) includes a reaction vessel cavity (1), a sealing cover (4) is connected to the top of the reaction vessel cavity (1), an air inlet (3) is opened at the bottom of the reaction vessel cavity (1), and an air outlet (2) is opened at the top of the reaction vessel cavity (1); a support is provided inside the reaction vessel cavity (1), and the support carries the resistor sheet to be tested.

2. The gas corrosion aging test apparatus according to claim 1, characterized in that, The inner wall of the reactor cavity (1) and the inner surface of the sealing cover (4) are coated with polytetrafluoroethylene; an electrode extension hole (5) is provided on the sealing cover (4), and the electrode extension hole (5) is located at the edge of the sealing cover (4).

3. The gas corrosion aging test apparatus according to claim 1, characterized in that, An air inlet connector (7) is provided on the air inlet (3), and at least six air inlet plugs (8) are integrated inside the air inlet connector (7); an air outlet plug (6) is provided inside the air outlet (2); the cross-sectional area of ​​the air outlet channel is 0.8 to 1.4 times the total cross-sectional area of ​​all channels in the air inlet area.

4. The gas corrosion aging test apparatus according to claim 1, characterized in that, The support includes a vertical structure and a horizontal structure; the vertical structure includes a main shaft, an auxiliary rod and a sliding collar; the electrode passes through the electrode extension hole (5) and is connected to the top of the main shaft; the horizontal structure is a tray.

5. The gas corrosion aging test apparatus according to claim 4, characterized in that, The sliding collar is slidably connected to the main shaft; the tray is composed of multiple support plates arranged in a ring, with the inner end of the support plate hinged to the main shaft; one end of the auxiliary rod is hinged to the sliding collar, and the other end is hinged to the corresponding support plate; the tray has a horizontally unfolded state and a vertically folded state on the main shaft.

6. The gas corrosion aging test apparatus according to claim 5, characterized in that, A spring pin is provided on the sliding collar, and a positioning groove is provided on the main shaft at the corresponding position of the sliding collar.

7. The gas corrosion aging test apparatus according to claim 6, characterized in that, There are multiple trays, arranged in pairs; in each group, the lower tray unfolds horizontally from bottom to top, and the upper tray unfolds horizontally from top to bottom; the gap between two trays in the same group after unfolding is consistent with the thickness of the resistor to be tested; the trays are equipped with positioning grooves.

8. The gas corrosion aging test apparatus according to claim 5, characterized in that, The support is made of copper and is fully coated with a corrosion-resistant coating on the outside. The surface area of ​​the tray is not greater than half of the cross-sectional area of ​​the reactor cavity (1). The support plates are spaced apart and the contact area between the tray and the resistor to be tested is not greater than half of the surface area of ​​the end face of the resistor to be tested.

9. A gas corrosion aging test method based on the experimental apparatus according to any one of claims 1 to 8, characterized in that, Includes the following steps: Place the support into the reactor cavity (1), place the resistor to be tested on the support, connect the top of the support to the external power supply through the electrode extension hole (5), and install the sealing cover (4) on the top of the reactor cavity (1). Corrosive gases enter from the bottom of the reactor chamber (1) through the inlet (3) and exit from the top through the outlet (2); The thermal management system is started, and the heating system heats the reactor at the set heating rate. The temperature is read in real time by the temperature monitoring sensor, and the ambient temperature inside the reactor chamber (1) is adjusted by the cooling system.

10. The gas corrosion aging test method according to claim 9, characterized in that, After the corrosive gas environment and temperature environment reach a steady state, the external high-voltage power supply is connected to the bracket through the electrode extension hole (5) to apply a high voltage pulse or current to the resistor under test; the other end of the external electrode is connected to the detection circuit to collect the resistance data of the resistor under test.

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