Device and method for generating anti-carburizing Cr2O3 film on Fe-Ni alloy surface

Abstract

According to the device and the method for generating the anti-carburizing Cr2O3 film on the surface of the Fe-Ni alloy, the special device integrating controllable water vapor supply and a high-temperature reaction unit is constructed, and a pre-oxidation method is adopted at the specific temperature and atmosphere (pure water vapor and low oxygen partial pressure), so that the anti-carburizing Cr2O3 film can be generated on the surface of the Fe-Ni alloy, and the anti-carburizing Cr2O3 film can be generated on the surface of the Fe-Ni alloy. A layer of continuous and compact Cr2O3 protective film is successfully grown on the surface of the Fe-Ni-based alloy with relatively low Cr content in situ; according to the method, the requirement of selective oxidation of alloy elements on the critical chromium content is effectively reduced, and the generated Cr2O3 film shows excellent stability in a subsequent severe supercritical carbon dioxide environment; therefore, the technical effects that the corrosion resistance of the alloy is remarkably improved, carbon elements are fundamentally prevented from being diffused inwards so as to strengthen the anti-carburizing capacity of the alloy, and the service life of key components is finally prolonged are achieved, meanwhile, the process is low in cost and easy to operate, and the problem that a traditional pre-oxidation technology depends on vacuum or high-purity inert gas is solved.

Description

Technical Field

[0001] This invention relates to the field of high-temperature alloy corrosion protection technology, and in particular to an apparatus and method for generating a carburizing Cr2O3 film on the surface of Fe-Ni alloy. Background Technology

[0002] Supercritical carbon dioxide (S-CO2) cycle power generation technology uses CO2 as the working fluid to convert thermal energy into mechanical energy and ultimately into electrical energy through a Brayton cycle power system. The entire cycle operates above the CO2 critical point parameters (7.38 MPa, 31 °C). CO2's critical temperature and critical pressure are much lower than water's, making it easier to achieve a supercritical state. Furthermore, S-CO2 has low viscosity, high density, and high heat transfer efficiency. Therefore, applying S-CO2 power generation technology to efficient and flexible thermal power generation, high-parameter, low-cost concentrated solar power generation, fourth-generation nuclear power such as liquid metal fast reactors / high-temperature gas-cooled reactors, and large-scale, long-term electrothermal energy storage is of great strategic significance for achieving dual-carbon goals.

[0003] With the increasing demand for high-parameter power generation systems, S-CO2 cycle systems also require improved operating parameters and optimized system layouts. However, the improvement of operating parameters is limited by the performance of the materials used. Currently, the design and material selection for S-CO2 generator sets primarily considers existing high-temperature materials used in ultra-supercritical thermal power plants. A new generation of Fe-Ni-based superalloys for 650℃ boilers is currently under design and development. These γ′ phase precipitation-strengthened superalloys have a high Fe content and a low Cr content (not exceeding 18 wt.%) to avoid the precipitation of harmful Cr-rich phases that could weaken the alloy's mechanical properties. However, when the Cr content is low, Fe-Ni-based alloys are prone to forming poorly protective Fe-rich oxides during service. Therefore, forming a continuous and complete protective Cr2O3 film on the surface of the Fe-Ni-based alloy can extend its service life at high temperatures. Summary of the Invention

[0004] A first aspect of this disclosure provides an apparatus for generating a carburizing-resistant Cr2O3 film on the surface of an Fe-Ni alloy, the apparatus comprising: The gas supply system includes a nitrogen source for providing an inert atmosphere and a high-purity CO2 storage cylinder for providing the reaction medium; The gas control unit includes a pressure reducing valve and a flow meter connected to the CO2 storage cylinder, used to regulate the pressure and flow rate of the CO2 gas; A steam supply unit, including an ultrapure water container and a peristaltic pump for conveying ultrapure water; The preheating furnace has its first inlet connected to the output end of the peristaltic pump for heating and vaporizing ultrapure water into water vapor. The nitrogen source and the CO2 storage cylinder are both connected to the second inlet of the preheating furnace through gas pipelines. A tubular heating furnace has a furnace tube inside, and a sample holder for placing Fe-Ni based alloy samples is installed inside the furnace tube; the output end of the preheating furnace is connected to the furnace tube inlet of the tubular heating furnace. The exhaust gas treatment device is connected to the furnace tube outlet of the tubular heating furnace.

[0005] In conjunction with the first aspect, the exhaust gas treatment device includes a two-stage conical flask.

[0006] In conjunction with the first aspect, the operating temperature range of the tubular heating furnace is 650℃ to 750℃, and the temperature control accuracy is ±3℃.

[0007] A second aspect of this disclosure provides a method for generating a carburizing-resistant Cr2O3 film on the surface of an Fe-Ni alloy using the above-described apparatus, comprising the following steps: S1. Place the Fe-Ni based alloy sample on the sample rack inside the furnace tube and seal the device. S2. Introduce nitrogen into the sealed device to purge the air inside. S3. Start the preheating furnace and the tubular heating furnace, and after heating to the pre-oxidation temperature, start the peristaltic pump to introduce water vapor into the device to pre-oxidize the Fe-Ni based alloy sample so that a Cr2O3 film is formed on its surface. S4. After the pre-oxidation treatment is completed, stop heating. During the cooling process of the device or after cooling to the set temperature, introduce nitrogen to remove residual water vapor in the device.

[0008] In conjunction with the second aspect, in step S2, the nitrogen gas is introduced for 60 to 90 minutes.

[0009] In conjunction with the second aspect, in step S3, the pre-oxidation temperature is higher than 680°C and lower than 750°C, the processing time is 10 to 20 hours, and the water vapor supply flow rate is 100 to 120 ml / s.

[0010] In conjunction with the second aspect, step S4 specifically includes: After stopping heating and allowing the tubular furnace to cool to 300°C, the peristaltic pump is turned off, and nitrogen is introduced to remove residual water vapor.

[0011] In conjunction with the second aspect, after step S4, the following is also included: Switch the flow of CO2 gas into the device, adjust the pressure reducing valve to make the CO2 pressure 0.1 MPa, and control the flow rate to 100 to 120 ml / min using a flow meter.

[0012] A third aspect of this disclosure provides an electronic device comprising: One or more processors; A storage unit for storing one or more programs that, when executed by one or more processors, enable the one or more processors to implement the method for generating a carburizing Cr2O3 film on the surface of an Fe-Ni alloy.

[0013] A fourth aspect of this disclosure provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, enables the method of generating an anti-carburization Cr2O3 film on the surface of an Fe-Ni alloy.

[0014] Beneficial Effects: This disclosure provides an apparatus and method for generating a carburizing-resistant Cr2O3 film on the surface of Fe-Ni alloys. By constructing a dedicated device integrating a controllable steam supply and a high-temperature reaction unit, and employing a pre-oxidation method under specific temperature and atmosphere (pure steam, low oxygen partial pressure), a continuous and dense Cr2O3 protective film is successfully grown in situ on the surface of Fe-Ni based alloys with relatively low Cr content. This method effectively reduces the critical chromium content requirement for selective oxidation of alloying elements. The generated Cr2O3 film exhibits excellent stability in the subsequent harsh supercritical carbon dioxide environment, thereby significantly improving the corrosion resistance of the alloy, fundamentally blocking the inward diffusion of carbon elements to enhance its carburizing resistance, and ultimately extending the service life of key components. At the same time, this process is low in cost and simple to operate, solving the problem of dependence on vacuum or high-purity inert gas in traditional pre-oxidation technologies. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the apparatus for generating a carburizing Cr2O3 film on the surface of an Fe-Ni alloy according to an embodiment of the present disclosure; Figure 2 This is a schematic flowchart of a method for generating a carburizing Cr2O3 film on the surface of an Fe-Ni alloy according to an embodiment of the present disclosure. Figure 3 An electronic device according to an embodiment of this disclosure. Detailed Implementation

[0016] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those disclosed herein.

[0017] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0018] It should be understood that although the terms first, second, third, etc., may be used to describe various information in embodiments of this disclosure, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of embodiments of this disclosure, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0019] like Figure 1 The diagram shown is a schematic representation of an apparatus for generating an anti-carburization Cr2O3 film on the surface of an Fe-Ni alloy according to an embodiment of this disclosure, comprising: The gas supply system includes a nitrogen source for providing an inert atmosphere and a high-purity CO2 storage cylinder for providing the reaction medium; The gas control unit includes a pressure reducing valve and a flow meter connected to the CO2 storage cylinder, used to regulate the pressure and flow rate of the CO2 gas; A steam supply unit, including an ultrapure water container and a peristaltic pump for conveying ultrapure water; The preheating furnace has its first inlet connected to the output end of the peristaltic pump for heating and vaporizing ultrapure water into water vapor. The nitrogen source and the CO2 storage cylinder are both connected to the second inlet of the preheating furnace through gas pipelines. A tubular heating furnace has a furnace tube inside, and a sample holder for placing Fe-Ni based alloy samples is installed inside the furnace tube; the output end of the preheating furnace is connected to the furnace tube inlet of the tubular heating furnace. The exhaust gas treatment device is connected to the furnace tube outlet of the tubular heating furnace.

[0020] Specifically, the gas supply system consists of a nitrogen source 1 and a high-purity carbon dioxide storage cylinder 2, which provide the necessary inert protective atmosphere and supercritical carbon dioxide reaction medium for the experimental process, respectively. Downstream of the carbon dioxide storage cylinder is a gas control unit, which includes a pressure reducing valve 3 and a flow meter 4. This unit can finely regulate the pressure and flow rate of the carbon dioxide gas to ensure that the gas parameters entering the reaction system are stable and meet the requirements.

[0021] To achieve the critical steam pre-oxidation process, the unit is equipped with a separate steam supply unit. This unit consists of an ultrapure water container 5 and a peristaltic pump 6, which is responsible for delivering ultrapure water to the subsequent units at a constant and controllable rate. The delivered ultrapure water then enters a preheating furnace 7, which acts as a steam generator. Its first inlet receives the ultrapure water from the peristaltic pump and heats and vaporizes it to produce the required steam. Notably, the preheating furnace has a second inlet, to which both the nitrogen source 1 and the carbon dioxide storage cylinder 2 are connected via gas pipelines. This design allows the protective gas and reactant gas to be mixed or switched with the steam before entering the main reaction zone.

[0022] The core reaction zone of the apparatus is a tubular furnace 8, which contains a furnace tube housing a sample holder 9 for holding Fe-Ni based alloy samples. The output of the preheating furnace 7 is directly connected to the inlet of this furnace tube, ensuring that the pretreated gas mixture can directly act on the alloy sample to be treated. Finally, a tail gas treatment device is connected to the outlet of the tubular furnace 8 to safely treat and discharge the waste gas after the reaction, completing the entire process.

[0023] The exhaust gas treatment device includes a two-stage conical flask.

[0024] Specifically, the exhaust gas treatment device includes conical flask 11 and conical flask 12. The conical flask 11, located at the front stage, serves as a cooling and collection device. When the high-temperature reaction gas (mainly composed of unreacted carbon dioxide, water vapor, etc.) flows out from the tubular heater 8, it is rapidly cooled here. The condensable water vapor is condensed into liquid and collected, thereby achieving preliminary purification and drying of the exhaust gas.

[0025] The conical flask 12 located in the later stage is specifically designed to prevent backflow. Even if the liquid in the preceding conical flask is backflowed due to a sudden interruption of airflow or pressure fluctuations within the system, the conical flask 12 in the later stage can effectively retain the liquid, ensuring that it cannot continue to flow back into the high-temperature tubular furnace, thereby avoiding the risk of explosion that may be caused by cold liquid contacting the high-temperature furnace tube.

[0026] The two-stage series design greatly enhances the reliability and safety of the entire device through functional division of labor (front stage for main cooling, rear stage for main safety).

[0027] The operating temperature range of the tubular heating furnace is 650℃ to 750℃, and the temperature control accuracy is ±3℃.

[0028] The temperature range of 650℃ to 750℃ is carefully selected. It must be high enough (usually above 600-650℃) to activate the chromium (Cr) atoms within the alloy, enabling them to rapidly migrate to the alloy surface and react with oxygen. Simultaneously, this temperature must be strictly limited below 750℃ to prevent microstructural degradation such as recrystallization, grain coarsening, or precipitation of harmful phases, ensuring the material's mechanical properties remain undamaged. More importantly, the high temperature control precision of ±3℃ ensures that the entire pre-oxidation process, especially the nucleation and growth stages of the Cr2O3 protective film, remains in an extremely stable and uniform thermal environment. This stability is essential for forming a continuous, dense, and defect-free Cr2O3 film. Any significant temperature fluctuations can lead to a porous film or the precipitation of other competing oxides (such as Fe oxides), severely weakening its final carburization and corrosion resistance.

[0029] like Figure 2 The diagram shown is a flowchart illustrating a method for generating an anti-carburization Cr2O3 film on the surface of an Fe-Ni alloy according to an embodiment of this disclosure, including: S1. Place the Fe-Ni based alloy sample on the sample rack inside the furnace tube and seal the device. The first step (S1) is sample installation and apparatus sealing. Specifically, the Fe-Ni based alloy sample to be treated is precisely placed on a sample holder at a specific location within the tubular furnace tube. The sample holder serves not only as a support but also to ensure that all sample surfaces are fully and uniformly exposed to the subsequently introduced reaction atmosphere, avoiding any shading effect caused by improper placement. Subsequently, all connections within the entire apparatus are rigorously sealed. This sealing operation is crucial, aiming to completely prevent the ingress of external air, thus laying the foundation for creating a pure, controllable inert atmosphere and reaction environment for the next step. Any minute leakage could lead to pre-oxidation failure or introduce uncontrollable variables.

[0030] S2. Introduce nitrogen into the sealed device to purge the air inside. In step S2, nitrogen gas is introduced for 60 to 90 minutes.

[0031] The purpose of this step is to completely remove oxygen from the reaction system, creating an oxygen-free, inert initial environment. Introducing high-purity nitrogen and maintaining it for 60 to 90 minutes is sufficient to allow the continuously flowing nitrogen to completely displace the air (mainly oxygen) from all chambers, including the furnace tubes, connecting pipes, and the preheating furnace. If the removal time is too short, residual oxygen will react unexpectedly with the alloy surface during subsequent heating stages, generating iron oxides that cannot protect the substrate and are detrimental to the subsequent selective oxidation of chromium, thus causing the pre-oxidation step to fail.

[0032] S3. Start the preheating furnace and the tubular heating furnace, and after heating to the pre-oxidation temperature, start the peristaltic pump to introduce water vapor into the device to pre-oxidize the Fe-Ni based alloy sample so that a Cr2O3 film is formed on its surface. In step S3, the pre-oxidation temperature is above 680°C and below 750°C, the treatment time is 10 to 20 hours, and the water vapor supply flow rate is 100 to 120 ml / s.

[0033] By utilizing the controllable oxygen partial pressure environment provided by pure water vapor under specific conditions, selective oxidation of chromium (Cr) on the alloy surface is induced, rather than iron (Fe) or nickel (Ni).

[0034] The temperature must be high enough (usually exceeding the critical point of about 680℃) to provide sufficient energy (activation energy) for the chromium atoms inside the alloy, enabling them to rapidly diffuse to the alloy surface and become the dominant element in the oxidation reaction. However, the temperature is strictly limited to below 750℃ to prevent the microstructure of the alloy matrix itself (such as the reinforcing phase) from coarsening or dissolving due to overheating, ensuring that the excellent mechanical properties of the material are not damaged.

[0035] The processing time (10 to 20 hours) directly affects the quality of the generated Cr2O3 protective film. This duration ensures that chromium atoms have sufficient time to diffuse, oxidize, nucleate, and grow into a continuous and dense oxide layer. Too short a time will result in a film that is too thin and incomplete, failing to provide effective protection; too long a time may lead to overgrowth of the film or stress, reducing economic efficiency.

[0036] The control of the water vapor flow rate (100 to 120 mL / s) aims to establish a stable and uniform water vapor atmosphere within the furnace tube. This flow rate ensures that sufficient water molecules participate in the reaction while promptly removing reaction byproducts (such as hydrogen), maintaining the stability of the reaction kinetics, and thus forming a uniform oxide film across the entire sample surface.

[0037] In summary, the synergistic effect and precise control of the three process parameters—temperature, time, and flow rate—in step S3 are the fundamental guarantee for achieving in-situ generation of a Cr2O3 film with excellent protective properties from the surface of Fe-Ni based alloys.

[0038] S4. After the pre-oxidation treatment is completed, stop heating. During the cooling process of the device or after cooling to the set temperature, introduce nitrogen to remove residual water vapor in the device.

[0039] Step S4 is as follows: After stopping heating and allowing the tubular furnace to cool to 300°C, the peristaltic pump is turned off, and nitrogen is introduced to remove residual water vapor.

[0040] The purpose of this step is to safely and smoothly conclude the pre-oxidation reaction and protect the generated Cr2O3 film and the experimental setup.

[0041] First, "stop heating" and adopt the method of "cooling with the furnace" (instead of directly opening the furnace door for quenching) are to avoid the newly formed Cr2O3 film or alloy substrate, which is still in a high-temperature state, from cracking or peeling due to uneven thermal expansion and contraction caused by rapid temperature changes (thermal shock), thereby destroying the integrity of the protective film.

[0042] Secondly, cooling to a specific temperature of 300℃ before shutting off the steam and purging is a critical safety threshold. Above 300℃, the alloy sample remains at a high temperature. If the steam is suddenly cut off at this point, allowing air to be drawn back into the system due to negative pressure, the sample may be over-oxidized by residual steam in an oxygen-deficient environment, potentially leading to hydrogen loss, or undesirable secondary oxidation may occur in an oxygen-rich environment. Continuously introducing steam up to 300℃ ensures that the sample remains in a controllable inert reducing atmosphere (where steam decomposes to produce hydrogen) during cooling, perfectly avoiding its oxidation-sensitive temperature range (typically 250℃-450℃), thus protecting the quality of the Cr2O3 film.

[0043] Finally, after the temperature dropped to a safe 300°C, the peristaltic pump was turned off to stop the supply of water vapor, and nitrogen was immediately introduced. This operation served a dual purpose: first, it actively purged and removed all residual water vapor from the entire system piping and furnace chamber, preventing it from condensing into water when the equipment was turned on later, thus avoiding corrosion of electrical components and the furnace body; second, it thoroughly filled the system with dry nitrogen to create a pure inert environment, providing absolute assurance for the safe opening of the device and removal of the sample, and also preparing for the supercritical carbon dioxide exposure experiment that could be carried out directly later.

[0044] Furthermore, after step S4, the following steps are also included: Switch the flow of CO2 gas into the device, adjust the pressure reducing valve to make the CO2 pressure 0.1 MPa, and control the flow rate to 100 to 120 ml / min using a flow meter.

[0045] The purpose of this step is to place the Fe-Ni based alloy sample, on which a dense Cr2O3 protective film has been successfully formed, in its target working environment—a supercritical carbon dioxide (S-CO2) atmosphere—to evaluate or demonstrate the actual protective effect of the pre-oxidation treatment.

[0046] Switching to CO2 gas is the starting point for the operating condition simulation. By using a valve system to switch the gas source from nitrogen to high-purity CO2, the experimental medium becomes the main working fluid that the alloy will encounter in an actual power generation system.

[0047] The pressure relief valve is adjusted to a CO2 pressure of 0.1 MPa. This setting is typically used for preliminary principle verification experiments under atmospheric or near-atmospheric pressure conditions. Although the critical pressure of supercritical carbon dioxide is 7.38 MPa, in laboratory studies, a high-temperature CO2 environment at atmospheric pressure can effectively simulate its main corrosion and carburizing chemical behaviors. This is crucial for the initial verification of the method's feasibility and can significantly reduce the complexity and cost of experimental equipment. Of course, this apparatus and method also have the potential to be extended to higher pressures (reaching or exceeding the supercritical pressure) for experiments.

[0048] Controlling the flow rate to 100 to 120 ml / min using a flow meter is to establish a stable and continuously renewing CO2 gas flow field within the reactor tube. A constant flow rate ensures that the sample remains in constant contact with fresh reactant gas, preventing localized atmospheric variations due to the reaction, thus guaranteeing the uniformity of experimental conditions and the reliability of results. This flow rate range is optimized to provide sufficient reactants without causing gas turbulence or erosion of the fragile oxide film due to excessively high flow rates.

[0049] In summary, this subsequent step places the pre-oxidized sample in a simulated real chemical environment, directly verifying the effectiveness of the generated Cr2O3 film in resisting CO2 corrosion and carbon permeation.

[0050] Electronic device 300 can be a desktop computer, laptop, handheld computer, cloud server, or other electronic device. Electronic device 300 may include, but is not limited to, processor 301 and memory 302. Those skilled in the art will understand that... Figure 3 This is merely an example of electronic device 300 and does not constitute a limitation on electronic device 300. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device may also include input / output devices, network access devices, buses, etc.

[0051] Processor 301 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0052] The memory 302 can be an internal storage unit of the electronic device 300, such as a hard disk or RAM of the electronic device 300. The memory 302 can also be an external storage device of the electronic device 300, such as a plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card equipped on the electronic device 300. Furthermore, the memory 302 can include both internal and external storage units of the electronic device 300. The memory 302 is used to store the computer program 303 and other programs and data required by the electronic device. The memory 302 can also be used to temporarily store data that has been output or will be output.

[0053] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure, and should all be included within the protection scope of this disclosure.

Claims

1. An apparatus for generating a carburizing-resistant Cr2O3 film on the surface of an Fe-Ni alloy, characterized in that, The device includes: The gas supply system includes a nitrogen source for providing an inert atmosphere and a high-purity CO2 storage cylinder for providing the reaction medium; The gas control unit includes a pressure reducing valve and a flow meter connected to the CO2 storage cylinder, used to regulate the pressure and flow rate of the CO2 gas; A steam supply unit, including an ultrapure water container and a peristaltic pump for conveying ultrapure water; The preheating furnace has its first inlet connected to the output end of the peristaltic pump for heating and vaporizing ultrapure water into water vapor. The nitrogen source and the CO2 storage cylinder are both connected to the second inlet of the preheating furnace through gas pipelines. A tubular heating furnace has a furnace tube inside, and a sample holder for placing Fe-Ni based alloy samples is installed inside the furnace tube; the output end of the preheating furnace is connected to the furnace tube inlet of the tubular heating furnace. The exhaust gas treatment device is connected to the furnace tube outlet of the tubular heating furnace.

2. The apparatus according to claim 1, characterized in that, The exhaust gas treatment device includes a two-stage conical flask.

3. The apparatus according to claim 1, characterized in that, The operating temperature range of the tubular heating furnace is 650℃ to 750℃, and the temperature control accuracy is ±3℃.

4. A method for generating an anti-carburization Cr2O3 film on the surface of an Fe-Ni alloy using the apparatus as described in claim 1, characterized in that, Includes the following steps: S1. Place the Fe-Ni based alloy sample on the sample rack inside the furnace tube and seal the device. S2. Introduce nitrogen into the sealed device to purge the air inside. S3. Start the preheating furnace and the tubular heating furnace, and after heating to the pre-oxidation temperature, start the peristaltic pump to introduce water vapor into the device to pre-oxidize the Fe-Ni based alloy sample so that a Cr2O3 film is formed on its surface. S4. After the pre-oxidation treatment is completed, stop heating. During the cooling process of the device or after cooling to the set temperature, introduce nitrogen to remove residual water vapor in the device.

5. The method according to claim 4, characterized in that, In step S2, nitrogen gas is introduced for 60 to 90 minutes.

6. The method according to claim 4, characterized in that, In step S3, the pre-oxidation temperature is above 680°C and below 750°C, the treatment time is 10 to 20 hours, and the water vapor supply flow rate is 100 to 120 ml / s.

7. The method according to claim 4, characterized in that, Step S4 is as follows: After stopping heating and allowing the tubular furnace to cool to 300°C, the peristaltic pump is turned off, and nitrogen is introduced to remove residual water vapor.

8. The method according to claim 4, characterized in that, Following step S4, the following is also included: Switch the flow of CO2 gas into the device, adjust the pressure reducing valve to make the CO2 pressure 0.1 MPa, and control the flow rate to 100 to 120 ml / min using a flow meter.

9. An electronic device, characterized in that, include: One or more processors; A storage unit for storing one or more programs that, when executed by one or more processors, enable the one or more processors to implement the method for generating a carburizing Cr2O3 film on the surface of an Fe-Ni alloy according to any one of claims 4 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it can implement the method for generating an anti-carburization Cr2O3 film on the surface of an Fe-Ni alloy according to any one of claims 4 to 8.

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