An apparatus and method for testing the corrosivity of liquid metals

Abstract

This invention discloses a device and method for testing the corrosivity of liquid metals, relating to the field of liquid metal characteristic testing technology. The device includes a sealed chamber, a support platform, a mechanical pressurization unit, and a heating device. The walls of the sealed chamber are equipped with interconnected vacuum and gas injection ports. Oxygen is removed from the chamber through the vacuum port to eliminate interference. The heating device melts the liquid metal to reduce drag. Pressure is applied by the mechanical pressurization unit to break up the melt and force it to spread onto the surface of the material being tested. A medium is injected through the gas injection port to simulate a specific environment. This invention effectively overcomes the problem of insufficient contact area caused by high surface tension and oxide film formation, achieving realistic and controllable interface corrosion verification. By combining the injection of the test gas medium with the process of pressure holding and subsequent isolation and preservation, the corrosion environment can be precisely controlled and the reaction process can be controlled, effectively blocking secondary oxidation interference and improving the accuracy of liquid metal corrosion verification data and the repeatability of the testing process.

Description

Technical Field

[0001] This invention relates to the field of liquid metal property testing technology, and in particular to a device and method for testing the corrosivity of liquid metals. Background Technology

[0002] Currently, the industry mainly adopts the following two testing methods for research on the corrosivity of liquid metal materials and their service environments: The first type is a contact corrosion testing method based on the principle of liquid immersion. For example, the scheme disclosed in Chinese patent application CN118111900A. This type of scheme typically places the metal sample to be tested on a dedicated test vessel support, and injects liquid metal through a pipe to completely submerge the sample. After the test vessel is heated and kept at a constant temperature for an extended period using a temperature control system, the sample is removed, and the corrosion rate is inferred through methods such as weight change analysis, metallographic scanning, and energy dispersive spectroscopy.

[0003] The second type is a corrosion screening device based on gas / vapor environment simulation. For example, the scheme disclosed in Chinese patent application CN112229782A. This type of scheme places the material to be tested in a corrosion-resistant container, using a vacuum system coupled with an inert gas supply system to control the internal atmosphere. A high-temperature environment (e.g., 550℃~850℃) is provided by an external heating device, causing the corrosive medium inside the sealed container to volatilize and form metal vapor or electrolyte vapor, thereby simulating the chemical corrosion behavior of the material surface under complex working conditions.

[0004] While the above solutions provide a means of corrosion assessment in specific scenarios, significant technical bottlenecks remain when addressing the testing requirements of "liquid metal directly acting on the surface of a solid substrate": 1) Oxide film interference is difficult to eliminate: Liquid metals (such as gallium-based alloys) have extremely high surface tension when molten. If the above-mentioned liquid phase immersion or atmospheric pressure operation mode is used, the liquid metal exposed to the atmospheric environment during the heating process is very easy to oxidize rapidly and form a dense oxide film. This oxide film not only hinders the actual contact corrosion between the liquid metal and the substrate, but also further increases the surface tension, leading to distortion of test data.

[0005] 2) Uncontrollable Spreading Contact Area: Existing solutions mostly rely on "natural gravity wetting" or "complete immersion." However, in practical engineering applications, the strength of liquid metal drops sharply after melting and its surface tension is high, making it difficult to spontaneously and uniformly spread on the surface of the test material. The contact area is extremely small and unevenly distributed, resulting in localized corrosion effects that are not easily observed. This makes it impossible to objectively verify the macroscopic corrosiveness of liquid metal on specific materials, leading to low test reliability. Summary of the Invention

[0006] The purpose of this invention is to provide a device and method for testing the corrosion of liquid metals, which can overcome the technical defects of easy oxidation and film formation on the surface of molten liquid metals and the difficulty in uniform contact with the substrate due to high tension, and realize the efficient verification of the corrosion of specific materials by liquid metals in a real and controllable manner.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a corrosion testing device for liquid metal, comprising a sealed chamber, a support platform, a mechanical pressurization unit, and a heating device; The sealed chamber is equipped with a switch door, a vacuum interface, and an air injection interface on its walls. The support platform is set inside the sealed chamber and is used to place the material to be tested, with liquid metal placed on the upper surface of the material to be tested; The vacuum interface is connected to the sealed chamber and is configured to pump the internal environmental pressure of the sealed chamber to a low-oxygen environment to eliminate the interference of oxygen on the oxide film on the surface of the liquid metal. The heating device is configured to heat the liquid metal on the support platform to a set temperature; The mechanical pressurizing part is placed above the liquid metal, with its bottom in contact with the liquid metal. After the liquid metal melts, it is used to apply pressure to the surface of the material being tested and to cause it to break and spread. The gas injection port is connected to the sealed chamber and is configured to inject test gas medium into the chamber to simulate a corrosive environment.

[0008] Optionally, the mechanical pressurizing part is a thermally conductive plate, and the surface of the mechanical pressurizing part does not chemically react with the liquid metal; The heating device includes an upper heating unit and a lower heating unit disposed on different heat conduction paths; the upper heating unit is disposed above the mechanical pressure part or embedded in the mechanical pressure part, and the lower heating unit is disposed between the support platform and the bottom surface of the material under test or embedded in the upper surface of the support platform, corresponding to the bottom surface of the material under test.

[0009] Optionally, at least one of the upper heating unit or the lower heating unit has an output temperature configured to be adjustable and not less than three times the melting point of the liquid metal.

[0010] Optionally, the outer contour dimension of the mechanical pressurizing part is smaller than the outer contour dimension of the material being tested, and the mass of the mechanical pressurizing part is 50 to 500 times the mass of the liquid metal; The mechanical pressurizing part is tilted and pressed onto the liquid metal, with one end abutting against the material being tested.

[0011] Optionally, the material under test is processed into a flat plate structure with a thickness between 0.08 mm and 2 mm; the liquid metal is not less than 5 mm in size and is placed in the middle area of ​​the material under test, in contact with the mechanical pressure part and the material under test simultaneously.

[0012] Optionally, the support platform is made of insulating material capable of withstanding temperatures above 200°C and has a stable support capacity of 10 kg or more; and / or The low-oxygen environment corresponds to an absolute pressure inside the chamber below 20 Pa.

[0013] Optionally, the vacuum interface is connected to an external vacuum pump via a vacuum pipe; The gas injection port is connected to an external gas supply device via an air inlet pipe.

[0014] In a second aspect, the present invention also provides a method for testing the corrosivity of liquid metal, wherein the test is performed based on a corrosion testing device according to any implementation of the first aspect, comprising the following steps: S1. Place the material to be tested on the support platform, and place the liquid metal in the designated area of ​​the material to be tested, and press the mechanical pressure part against the liquid metal; S2. Seal the sealed chamber and activate the vacuum interface to evacuate the chamber to a low-oxygen environment to eliminate the interference of oxygen on the oxide film on the surface of the liquid metal, and inject the test gas medium at the required pressure into the chamber through the gas injection interface. S3. The liquid metal is heated by the heating device, causing it to melt into a liquid state and its strength to decrease significantly. At the same time or after the liquid metal melts, the mechanical pressure applied by the mechanical pressurizing part will break it and cause the molten liquid metal to spread on the surface of the test material. S4. After maintaining the set time, stop heating and remove the test material. Verify the corrosivity through macroscopic morphology and microstructure analysis.

[0015] Optionally, in step S4, after removing the test material, it is placed in a sealed bag for storage, and the damage condition of the test material is photographed.

[0016] Optionally, in step S4, after heating is stopped, the vacuum or gas medium state set in the sealed chamber is maintained for 1 hour, then inert gas is injected to atmospheric pressure, and then the sealed chamber structure is opened to take out the material to be tested.

[0017] The above-described technical solution of the present invention has the following advantages: The corrosion testing device for liquid metal provided by this invention utilizes a vacuum interface to create a low-oxygen environment to eliminate oxygen interference, combined with the pressure applied by a mechanical pressurizing unit. This allows the liquid metal to instantly break the surface tension film and forcibly spread onto the surface of the tested material after its melting intensity decreases, significantly expanding the effective corrosion contact area. Compared to existing testing methods that rely on complete immersion or vapor-phase isolation, this invention overcomes the technical shortcomings of traditional methods—such as uncontrollable effective interface and difficulty in revealing corrosion due to high surface tension and oxide film obstruction—through its structural design of direct contact and pressurized spreading above the liquid metal. Furthermore, it features a simple structure and high reliability.

[0018] The corrosion testing method for liquid metals provided by this invention, by combining the injection of test gas medium with pressure holding and isolation preservation, allows for precise control of the corrosion environment and controllable reaction process, effectively blocking subsequent secondary oxidation interference, and improving the accuracy of liquid metal corrosion verification data and the repeatability of the testing process. Attached Figure Description

[0019] The accompanying drawings are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not be consistent with the actual product.

[0020] Figure 1 This is a schematic diagram of the structure of a liquid metal corrosion testing device according to Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of another liquid metal corrosion testing device in Embodiment 1 of the present invention.

[0021] In the figure: 1: Sealed chamber; 11: Vacuum interface; 12: Gas injection interface; 2: Support platform; 3: Mechanical pressurization unit; 4: Upper heating unit; 5: Lower heating unit; 6: Test material; 7: Liquid metal. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Unless otherwise expressly specified and limited, the terms "set in," "placed," "installed," "connected," "communicated," and "connected" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements. This is for those skilled in the art.

[0024] This invention provides a device and method for testing the corrosion resistance of liquid metals, which differs from the indirect contact methods of "complete immersion" or "vapor phase isolation" commonly used in existing technologies. This invention employs a testing approach that directly promotes spreading through physical means in a low-oxygen vacuum environment. Specifically, in an extremely low-oxygen environment (below 20 Pa), oxygen interference is blocked. A mechanical pressure unit is directly pressed onto the surface of the liquid metal droplet. After heating to melt and reduce its rheological strength, mechanical force instantly breaks the oxide film and forces the melt to spread onto the surface of the tested material. This fundamentally solves the technical bottleneck of high surface tension and difficulty in uniformly contacting the substrate with liquid metals.

[0025] The technical solution of the present invention will be described in detail below through specific embodiments: Example 1 See Figure 1 The present invention provides a liquid metal corrosion testing device, which includes a sealed chamber 1, a support platform 2, a mechanical pressurization part 3, a heating device, and a vacuum interface 11 and a gas injection interface 12 disposed on the sealed chamber 1.

[0026] The sealed chamber 1 is the main structure providing a sealed testing environment, and its side wall has a door (not shown) for the entry and exit of the test sample. The support platform 2 is located at the bottom of the inner cavity or on the side wall of the sealed chamber 1, and is used to stably place the test material 6. The liquid metal 7 to be tested is placed in a designated area on the upper surface of the test material 6, for example, preferably in the middle area of ​​the upper surface of the test material 6. In this embodiment, the liquid metal 7 is presented in a spherical shape.

[0027] In this embodiment, the vacuum interface 11 can be a vacuum port connected to the sealed chamber 1. It is connected to an external vacuum pump through the vacuum port. After the vacuum pump is started, the environmental pressure inside the sealed chamber 1 is continuously evacuated to a low-oxygen state below 20 Pa through the vacuum port 11, which fundamentally eliminates the interference of atmospheric oxygen on the rapid oxidation of the liquid metal surface. At the same time, the gas injection interface 12 can be a gas inlet port connected to the sealed chamber 1. It is connected to an external gas supply device through a gas inlet pipe. After the vacuum standard is met, a test gas medium (e.g., nitrogen) at a set pressure can be accurately injected into the chamber to simulate the real service environment.

[0028] The heating device provides the heat energy required for the phase change. The mechanical pressurizing unit 3 is positioned above the liquid metal 7, with its bottom in direct contact with and pressing against the upper surface of the liquid metal 7. When the strength of the liquid metal drops sharply after melting under normal gravity and it is difficult to spread spontaneously due to surface tension, the mechanical pressurizing unit 3 applies downward pressure using its own mass or an external driving mechanism. This pressure acts directly on the molten liquid metal, disrupting its surface tension balance, causing the broken droplets to be forcibly peeled off and evenly spread on the surface of the tested material 6, thereby greatly expanding the effective contact area and allowing the corrosion effect to fully manifest.

[0029] See one example. Figure 1 The mechanical pressure section 3 is made of a high thermal conductivity and chemically inert metal plate (e.g., stainless steel plate), and its surface is polished to ensure that no initial chemical / physical adhesion reaction occurs with the liquid metal. The heating device includes an upper heating unit 4 and a lower heating unit 5 disposed on different heat conduction paths. The upper heating unit 4 is disposed on the upper surface of the metal plate and transfers heat downward through the metal plate. The lower heating unit 5 is disposed between the support platform 2 and the bottom surface of the test material 6, corresponding to the bottom surface area of ​​the test material 6. Independent temperature control of the upper and lower paths ensures that heat penetrates symmetrically from the bottom surface upward and the top surface downward, avoiding thermal stress concentration that could cause warping of the substrate, and providing good heating uniformity and high efficiency. Preferably, the upper heating unit 4 is an existing heating plate, and its outer contour dimensions are larger than those of the metal plate serving as the mechanical pressure section 3. The lower heating unit 5 also uses an existing heating plate, and its outer contour dimensions are larger than those of the test material 6 to further improve heating efficiency.

[0030] In this embodiment, a metal plate pressurized by gravity is preferably used as the mechanical pressing part. The outer contour dimensions of the metal plate are strictly smaller than the contact area of ​​the test material 6 to support the metal plate. The mass of the metal plate is set to be within the range of 50 to 500 times the mass of the liquid metal 7, for example, 100 times. Experiments show that this mass range can provide a better film-breaking and spreading torque without crushing the thin substrate. In use, the mechanical pressing part 3 is tilted and pressed onto the liquid metal, with its low-angle end abutting against the edge limit of the test material 6, forming a force condition dominated by the vertical component force with the low-angle end as the fulcrum.

[0031] In some embodiments, the upper heating unit 4 may be embedded inside the mechanical pressurization part 3 (see reference). Figure 2 The lower heating unit 5 can also be embedded in the upper surface of the support platform 2. In this embodiment, the upper heating unit 4 and the lower heating unit 5 can be heating plates or heating wires. No limitation is made here.

[0032] In another example, see Figure 2 The mechanical pressurization unit 3 is a metal plate with an external drive mechanism, such as hydraulic or electric drive. The pressurization plate is in contact with the liquid metal 7 and is also made of a metal plate with high thermal conductivity and chemical inertness. In this example, the upper heating unit 4 is embedded in the metal plate.

[0033] In this embodiment, preferably, at least one of the upper heating unit 4 or the lower heating unit 5 has an output temperature that is continuously adjustable and not less than three times the melting point of the liquid metal used, to ensure rapid and thorough phase change and eliminate the influence of local cold zones on the uniformity of spreading.

[0034] In this embodiment, the test material 6 is processed into a standard flat plate structure with a thickness controlled between 0.08 mm and 2 mm; the liquid metal 7, in the form of a sphere with a size of not less than 5 mm or a column with a cross-sectional size of not less than 5 mm, is placed in the geometric center region of the test material 6 to ensure that it maintains physical contact with the bottom of the mechanical pressure part 3 and the upper surface of the substrate at the same time.

[0035] In one example, the support platform 2 is made of insulating material (e.g., ceramic) that can withstand temperatures above 200°C, and is equipped with a gravity-compensated base at the bottom with a stable static support of 10 kg or more, effectively isolating ground vibration from interfering with the observation of trace corrosion morphology.

[0036] Example 2 This embodiment provides a corrosion testing method for liquid metal based on the corrosion testing device in Embodiment 1, specifically including the following steps: S1. Initial Sample Loading: Place the material to be tested 7 stably on the working surface of the support platform 2, and place a quantitative amount of liquid metal 7 in the designated central area of ​​the material to be tested 6. The bottom of the mechanical pressure unit 3 presses against the liquid metal 7 to ensure a tight, gapless initial contact.

[0037] S2. Environment Setup: Close the door of the sealed chamber 1 and lock the sealing structure. Start the vacuum pump to perform multi-stage evacuation of the chamber through the vacuum interface 11, and monitor the pressure sensor feedback in real time. When the absolute pressure inside the chamber is stably lower than 20 Pa, shut off the vacuum pump and maintain the pressure. Then, slowly inject the test gas medium at the set pressure into the chamber through the gas injection interface 12 to establish the target corrosive atmosphere environment.

[0038] S3. Heating, Spreading, and Reaction: The heating device is activated by a temperature controller to gradually increase the temperature of the liquid metal 7, causing it to melt into a highly fluid liquid state with a significant reduction in bulk strength. During the melting process of the liquid metal or after the phase change is completed, the mechanical pressure unit 3 continuously applies pressure to the surface of the tested material 6, forcibly breaking and promoting the spread of the molten liquid metal film to cover the substrate surface.

[0039] S4. Pressure Holding, Removal, and Characterization Analysis: After maintaining the set heating time and chamber pressure, stop the heating device. Remove the cooled test material 6 through the opening and closing door of the sealed chamber 1 and immediately place it in an inert protective sealed bag to isolate it from air. Capture the macroscopic corrosion morphology using a camera and photograph the local corrosion details using a magnifying glass. Then, verify the corrosivity through macroscopic morphology and microstructure analysis. The specific methods for analyzing and verifying the corrosivity are existing technologies and will not be elaborated here.

[0040] This testing method, by combining the injection of test gas medium with pressure holding and isolation preservation, allows for precise control of the corrosive environment and a controllable reaction process. It effectively blocks subsequent secondary oxidation interference, improves the accuracy of liquid metal corrosion verification data and the repeatability of the testing process.

[0041] Preferably, in step S4, after heating is stopped, the vacuum or gas medium state set in the sealed chamber is maintained for 1 hour, then inert gas is injected to atmospheric pressure, and then the sealed chamber structure is opened to take out the material to be tested.

[0042] In summary, the testing apparatus and method provided by the embodiments of the present invention have a simple and compact overall structure, with a reasonable layout of core components that are easy to industrially process and assemble. By constructing a vacuum-gas injection environment and coupling it with bidirectional heating from top to bottom, combined with the physical facilitation mechanism of the mechanical pressurization section, not only are the poor contact problems caused by liquid metal oxidation and surface tension effectively avoided, but the stability of the testing process and the repeatability of the data are also significantly improved. This fully achieves the technical objective of the present invention to overcome the defects of the prior art and realize real and controllable corrosion verification.

[0043] It should be specifically noted that the "vacuum interface" and "gas injection interface" mentioned in this invention refer only to the physical connection ports located on the side wall of the sealed chamber. In actual functional implementation, the vacuum interface and the gas injection interface can be connected to external vacuum equipment (such as a vacuum pump) or gas supply devices (such as gas source cylinders or pressure reducing valve groups) through extraction and inlet pipes, respectively. A control valve is preferably connected in series on the pipes. The control valve is configured to open and close the pipes to cut off the gas path, or to adjust the flow cross-section to control the negative pressure removal rate inside the chamber and the injection pressure and flow rate of the test gas medium. It should be pointed out that the core structure of the testing device protected by this invention is limited to the sealed chamber and its internal functional module arrangement; pipes, valves, and power / gas source equipment other than the interfaces are all peripheral auxiliary systems used in conjunction with the device of this application. In practical applications, those skilled in the art can freely select or independently arrange the aforementioned peripheral components outside the cabin according to actual working conditions. Their specific models, pipe diameters, or valve types do not constitute a limitation on the essential features of the technical solution of this application. As long as the functions of cabin air pressure regulation and medium injection can be realized, they all fall within the protection scope of this invention.

[0044] It should also be noted that any parts of this invention not described in detail are common knowledge or existing technology in the field.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution, and in the absence of conflict between solutions, the various technical features mentioned in each embodiment can be combined in any way to form other implementation methods that can be understood by those skilled in the art.

[0046] Furthermore, without departing from the scope of the present invention, modifications to the technical solutions described in the foregoing embodiments, or equivalent substitutions of some of the technical features, shall not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for testing the corrosion resistance of liquid metal, characterized in that, Includes a sealed chamber, a support platform, a mechanical pressurization unit, and a heating device; The sealed chamber is equipped with a switch door, a vacuum interface, and an air injection interface on its walls. The support platform is set inside the sealed chamber and is used to place the material to be tested, with liquid metal placed on the upper surface of the material to be tested; The heating device is configured to heat the liquid metal on the support platform to a set temperature; The mechanical pressurizing part is placed above the liquid metal, with its bottom in contact with the liquid metal. After the liquid metal melts, it is used to apply pressure to the surface of the material being tested and to cause it to break and spread. The gas injection port is connected to the sealed chamber and is configured to inject test gas medium into the chamber to simulate a corrosive environment.

2. The corrosion testing device according to claim 1, characterized in that: The mechanical pressurizing part is a thermally conductive flat plate, and the surface of the mechanical pressurizing part does not chemically react with the liquid metal; The heating device includes an upper heating unit and a lower heating unit disposed on different heat conduction paths; the upper heating unit is disposed above the mechanical pressure part or embedded in the mechanical pressure part, and the lower heating unit is disposed between the support platform and the bottom surface of the material under test or embedded in the upper surface of the support platform, corresponding to the bottom surface of the material under test.

3. The corrosion testing device according to claim 2, characterized in that: At least one of the upper heating unit or the lower heating unit has an output temperature that is adjustable and not less than three times the melting point of liquid metal.

4. The corrosion testing device according to claim 1, characterized in that: The outer contour dimension of the mechanical pressurizing part is smaller than the outer contour dimension of the material being tested, and the mass of the mechanical pressurizing part is 50 to 500 times the mass of the liquid metal. The mechanical pressurizing part is tilted and pressed onto the liquid metal, with one end abutting against the material being tested.

5. The corrosion testing device according to claim 4, characterized in that: The test material is processed into a flat plate structure with a thickness between 0.08 mm and 2 mm; the liquid metal is not less than 5 mm in size and is placed in the middle area of ​​the test material, in contact with the mechanical pressure part and the test material simultaneously.

6. The corrosion testing device according to claim 1, characterized in that: The support platform is made of insulating material capable of withstanding temperatures above 200°C and provides stable support of 10 kg or more; and / or The low-oxygen environment corresponds to an absolute pressure inside the chamber below 20 Pa.

7. The corrosion testing device according to claim 1, characterized in that: The vacuum interface is connected to an external vacuum pump via a vacuum pipe. The gas injection port is connected to an external gas supply device via an air inlet pipe.

8. A method for testing the corrosion of liquid metal based on the corrosion testing apparatus according to any one of claims 1 to 7, characterized in that: Includes the following steps: S1. Place the material to be tested on the support platform, and place the liquid metal in the designated area of ​​the material to be tested, and press the mechanical pressure part against the liquid metal; S2. Seal the sealed chamber and activate the vacuum interface to evacuate the chamber to a low-oxygen environment to eliminate the interference of oxygen on the oxide film on the surface of the liquid metal, and inject the test gas medium at the required pressure into the chamber through the gas injection interface. S3. The liquid metal is heated by the heating device, causing it to melt into a liquid state and its strength to decrease significantly. At the same time or after the liquid metal melts, the mechanical pressure applied by the mechanical pressurizing part will break it and cause the molten liquid metal to spread on the surface of the test material. S4. After maintaining the set time, stop heating and remove the test material. Verify the corrosivity through macroscopic morphology and microstructure analysis.

9. The corrosion testing method according to claim 8, characterized in that: In step S4, the material to be tested is removed and placed in a sealed bag for storage, and the damage condition of the material to be tested is photographed.

10. The corrosion testing method according to claim 8, characterized in that: In step S4, after heating is stopped, the vacuum or gas medium state set in the sealed chamber is maintained for 1 hour, then inert gas is injected to atmospheric pressure, and then the sealed chamber structure is opened to take out the material to be tested.

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