Corrosion risk assessment method

Abstract

The invention discloses a corrosion risk assessment method, belongs to the technical field of industrial pipeline corrosion tests, and is used for guiding a user to adjust actual operation parameters of a to-be-assessed object and reduce the corrosion risk. According to the main technical scheme, the corrosion risk assessment method comprises the steps that firstly, normal temperature and normal pressure serve as starting points, the temperature, pressure and test medium flow speed in a reaction kettle are increased step by step according to a preset gradient and design parameters of a to-be-assessed object, and multiple sets of simulation tests are carried out; then collecting reference corrosion parameters of each layer of test piece of the test rack in the simulation test, and selecting characteristic parameters; replacing the test piece, setting reaction kettle conditions according to actual operation parameters of the to-be-evaluated object, and carrying out a contrast test; then actual corrosion rates of the test piece in gaseous, liquid and gas-liquid two-state test media in the contrast test are collected as actual corrosion parameters; and finally, according to phase state classification, comparing the actual corrosion parameters with the characteristic parameters, and adjusting the actual operation parameters of the to-be-evaluated object according to a comparison result.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial pipeline corrosion testing, and specifically to a corrosion risk assessment method. Background Art

[0002] In various industrial production processes and infrastructure construction, the corrosion of equipment and materials has always been a key factor affecting the stability, safety and economy of the system. From oil and gas extraction and transportation pipelines, to reaction vessels and transmission pipelines in chemical production, to long-term seawater erosion of marine engineering facilities, metal structures are facing corrosion risks all the time.

[0003] Among the many factors that affect corrosion, the actual operating parameters of the object to be evaluated play a key role. However, there are currently many difficulties in determining and adjusting operating parameters. Specifically, when setting operating parameters, many companies mainly rely on past experience or simple engineering estimates, lacking scientific and accurate method guidance, resulting in the actual operating parameters often being unable to effectively control corrosion risks while ensuring production efficiency. Summary of the invention

[0004] In view of this, the present application provides a corrosion risk assessment method, the main purpose of which is to guide users to adjust the actual operating parameters of the object to be assessed to reduce the corrosion risk.

[0005] In order to achieve the above objectives, this application mainly provides the following technical solutions: The present application provides a corrosion risk assessment method, which is applied to a corrosion test system. The corrosion test system includes a reactor, a stirrer and a test stand. The rotatable part of the stirrer and the test stand are both arranged in the reactor. The test stand is used to fix the test piece. The test stand has three layers in the vertical direction. The reactor is used to inject a test medium. The liquid level of the test medium is controlled at the middle layer of the test stand. The corrosion risk assessment method includes: Starting from normal temperature and pressure, according to a preset gradient and in accordance with the design parameters of the object to be evaluated, the temperature and pressure in the reactor and the flow rate of the test medium in the reactor are gradually increased to carry out multiple groups of simulation tests; Collecting a plurality of groups of reference corrosion parameters corresponding to the test pieces in each layer of the test frame in the simulation test respectively, and selecting characteristic parameters from the plurality of groups of reference corrosion parameters; Replace the test pieces in each layer of the test rack, set the temperature and pressure in the reactor and the flow rate of the test medium in the reactor with reference to the actual operating parameters of the object to be evaluated, and conduct a comparative test; Collecting actual corrosion parameters corresponding to the test pieces in each layer of the test rack in the comparative test, the actual corrosion parameters including the actual corrosion rate of the test pieces in the gaseous test medium, the actual corrosion rate in the liquid test medium, and the actual corrosion rate in the gas-liquid test medium; The actual corrosion parameter is compared with the characteristic parameter according to the phase classification, and the actual operating parameter of the object to be evaluated is adjusted based on the comparison result.

[0006] Optionally, respectively collecting multiple groups of reference corrosion parameters corresponding to the test pieces in each layer of the test rack in the simulation test, and selecting characteristic parameters from the multiple groups of reference corrosion parameters includes: Before carrying out multiple groups of simulation tests, for each group of simulation tests, weigh each of the test pieces in each layer of the test rack in turn, and record the initial weight of each of the test pieces in each layer of the test rack in each group of simulation tests; After the multiple groups of simulation tests are completed, for each group of simulation tests, each of the test pieces in each layer of the test rack is weighed again in turn, and the final weight of each of the test pieces in each layer of the test rack in each group of simulation tests is recorded; Calculate the corrosion rate of each test piece on each layer of the test frame in each group of simulation tests based on the weight loss method to obtain multiple groups of reference corrosion parameters; The reference corrosion parameter with the largest value among the multiple groups of reference corrosion parameters is screened and determined, and is used as the characteristic parameter.

[0007] Optionally, the corrosion test system further includes a galvanic corrosion sensor, at least three of which are provided, and the at least three galvanic corrosion sensors are provided in one-to-one correspondence with the three layers of the test frame; the corrosion risk assessment method further includes: During the continuous process of each group of simulation tests, real-time corrosion current data output by the galvanic corrosion sensors corresponding to each layer of the test frame are obtained in real time; The corrosion rates of the galvanic corrosion sensors corresponding to each layer of the test frame are calculated based on the real-time corrosion current data.

[0008] Optionally, the calculating the corrosion rate of the galvanic corrosion sensor corresponding to each layer of the test frame based on the real-time corrosion current data includes: Draw a material corrosion mass loss curve graph, with reaction time as the independent variable and total material mass loss at different reaction times as the dependent variable, and visualize the change of total material mass loss with the reaction time; Based on the material corrosion mass loss curve, the corrosion rate of the galvanic corrosion sensor corresponding to each layer of the test frame is calculated.

[0009] Optionally, after calculating the corrosion rate of the galvanic corrosion sensor corresponding to each layer of the test rack based on the real-time corrosion current data, the corrosion risk assessment method further includes: For the plurality of groups of simulation tests, respectively sorting out the corrosion rate data of the test pieces on each layer of the test rack in each group of simulation tests and the corresponding corrosion rate data of the galvanic corrosion sensors on each layer; Using a data analysis method, based on the sorted corrosion rate data of multiple groups of the test pieces and the corrosion rate data of multiple groups of the galvanic corrosion sensors, a conversion relationship between the corrosion rate of the galvanic corrosion sensor and the corrosion rate of the test piece is determined.

[0010] Optionally, comparing the actual corrosion parameter with the characteristic parameter according to phase classification, and adjusting the actual operating parameter of the object to be evaluated based on the comparison result includes: When the difference between the absolute value of the actual corrosion parameter and the characteristic parameter is within a preset setting interval, during actual operation, the temperature and / or pressure inside the object to be evaluated and / or the flow rate of the test medium are reduced.

[0011] Optionally, a plurality of the test specimens are fixed on each layer of the test rack, so that the corrosion test system can verify the relationship between the flow rate of the test medium and the corrosion rate of the test specimen under different phases.

[0012] Optionally, the corrosion test system also includes a pressure sensor, a temperature sensor and a flow rate sensor. The pressure sensor is arranged on the top cover of the reactor, the temperature sensor is arranged on the bottom wall of the reactor, and three flow rate sensors are arranged. The three flow rate sensors are all arranged on the outer wall of the reactor and are arranged one-to-one corresponding to the three layers of the test frame.

[0013] Optionally, the corrosion test system also includes a booster pump and a heater, the booster pump is connected to the inner cavity of the reactor, the booster pump is used to adjust the pressure inside the reactor, and the heater is arranged on the outer wall of the reactor, and the heater is used to adjust the temperature inside the reactor.

[0014] Optionally, a ceramic gasket is provided at the connection between the test piece and the test frame, and the ceramic gasket is used to isolate the test piece from the test frame.

[0015] By means of the above technical solution, the present application has at least the following beneficial effects: The corrosion risk assessment method provided in the embodiment of the present application can simulate the corrosion of test pieces at different heights in different gas-liquid phases and gas-liquid interfaces by setting the test frame in three layers in the vertical direction and controlling the test medium liquid level in the middle layer, and more comprehensively reflect the different corrosion environments that may exist in metal structures in practical applications. By starting from normal temperature and pressure in multiple groups of simulation tests, the temperature, pressure and flow rate of the test medium in the reactor are gradually increased according to the preset gradient and design parameters, and the corresponding reference corrosion parameters are collected, so that the influence of different operating parameters on the corrosion rate can be systematically studied, and a scientific basis can be provided for determining the optimal operating parameters. By selecting characteristic parameters from multiple groups of reference corrosion parameters, the combination of operating parameters such as the temperature, pressure and flow rate of the test medium in the reactor that cause the most serious corrosion can be determined. By referring to the actual operating parameters of the object to be evaluated, setting the temperature, pressure and flow rate of the test medium in the reactor, the real working environment of the object to be evaluated can be highly restored, so that the comparative test results conducted in the corrosion test system can truly reflect the corrosion of the metal structure in the object to be evaluated under actual working conditions, and improve the accuracy and reliability of the test results. By collecting the actual corrosion parameters of the test specimens in gaseous, liquid and gas-liquid test media, a rich and detailed data basis is provided for the subsequent corrosion risk assessment, which can fully demonstrate the corrosion characteristics of metal structures in different medium phases and help to gain a deeper understanding of the corrosion mechanism. By comparing the actual corrosion parameters and characteristic parameters based on phase classification, the changing trends and differences of the corrosion rate under different operating parameters can be clearly analyzed, and the actual operating parameters of the object to be evaluated can be adjusted based on this comparison result, which is highly targeted and scientific. By optimizing the actual operating parameters, the corrosion risk of the metal structures in the object to be evaluated can be effectively reduced, the service life of the object to be evaluated can be extended, the maintenance and replacement costs of the object to be evaluated can be reduced, and the safety and stability of production can be improved, thereby bringing significant economic and social benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flowchart of a corrosion risk assessment method according to an optional embodiment of the present application; Figure 2 A structural schematic diagram of a corrosion test system of an optional embodiment of the present application; Figure 3 This is a schematic diagram of the structure of a test stand of an optional embodiment of the present application; Figure 4 This is a schematic structural diagram of the connection between a test piece and a test frame according to an optional embodiment of the present application.

[0017] The reference numerals are: 1. Reactor; 2. Mixer; 3. Test stand; 4. Test piece; 5. Galvanic corrosion sensor; 6. Pressure sensor; 7. Temperature sensor; 8. Flow rate sensor; 9. Heater; 10. Ceramic gasket; 11. Signal amplifier; 12. Data acquisition instrument; 13. Computer. DETAILED DESCRIPTION

[0018] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0019] See also Figure 1 As shown, in this embodiment, a corrosion risk assessment method is provided, comprising: Step S101: Starting from normal temperature and pressure, according to a preset gradient and design parameters of the object to be evaluated, the temperature and pressure in the reactor 1 and the flow rate of the test medium in the reactor 1 are gradually increased to carry out multiple groups of simulation tests.

[0020] The corrosion risk assessment method provided in the embodiment of the present application can be used in the fields of industrial pipeline corrosion testing, and can be specifically used in oil and gas pipeline corrosion testing. It can be understood that in the oil and gas pipeline corrosion testing, the object to be assessed is the actual oil and gas pipeline, and the metal structure is the pipeline component in the oil and gas pipeline.

[0021] Here, the corrosion risk assessment method is applied to the corrosion test system, which simulates the corrosion of pipeline components in oil and gas pipelines. Figure 2 and Figure 3As shown, the corrosion test system includes a reactor 1, a mixer 2 and a test stand 3. The reactor 1 is used as a container for the entire corrosion test to contain various substances required for the test to create an environment similar to the actual working conditions. Here, the test medium is injected into the reactor 1, and the temperature, pressure and other conditions of the reactor 1 are regulated to simulate the environment in which the object to be evaluated is in actual operation. For example, when simulating the corrosion environment of the oil and gas pipeline, the reactor 1 can reproduce the high temperature and high pressure state inside the oil and gas pipeline by heating and pressurizing, so that the test medium is in a physical state similar to that in the actual pipeline. The rotatable part of the mixer 2 is located inside the reactor 1, which is used to stir the test medium in the reactor 1. Through stirring, the test medium can be evenly mixed, and the flow state of the actual fluid can be simulated, so that the test medium produces a similar flow rate and flow pattern, so that the fluid mechanics effect on the test piece 4 is closer to the actual situation. The test stand 3 is also located inside the reactor 1, which is used to place the test piece 4, and the metal structure in the object to be evaluated, that is, the pipeline components in the oil and gas pipeline, is characterized by the test piece 4. In actual application, the test stand 3 is provided with three layers in the vertical direction, and the liquid level of the test medium is precisely controlled at the middle layer of the test stand 3, which can realize the full-scale simulation of the corrosion environment at different positions. Specifically, the upper layer of the test stand 3 is in the gaseous test medium environment, which can simulate the corrosion of the pipeline components located in the gas phase space part of the oil and natural gas pipeline, such as some pipeline components that are above the liquid surface or in the gas gathering area; the middle layer of the test stand 3 is at the gas-liquid interface, which is an extremely special corrosion environment. It is not only infiltrated by the liquid test medium, but also in contact with the gaseous test medium, which will produce a unique corrosion reaction, corresponding to the simulation of the corrosion of the pipeline components that are exactly at the gas-liquid interface in the actual pipeline; the lower layer of the test stand 3 is completely immersed in the liquid test medium, which can simulate the corrosion of the pipeline components that are in the underwater or liquid environment for a long time. Through the setting of these three layers of different environments, the corrosion behavior of the test piece 4 in different phase test media can be comprehensively studied, and more abundant and accurate corrosion data can be obtained, thereby providing strong support for more accurate assessment of corrosion risks. In addition, the test piece 4 is placed on the test stand 3, the test piece 4 is fixed, and the flow of the test medium is driven by the mixer 2, which can more purely simulate the actual situation in the industrial pipeline. Compared with the test piece 4 in the rotating test medium, the additional mechanical stress introduced by the rotation of the test piece 4 is avoided, which makes it difficult to simply attribute the test results to the corrosion effect between the test medium and the test piece 4, and interferes with the accurate assessment of the corrosion risk.

[0022] In this embodiment, first, before starting multiple groups of simulation tests, the temperature, pressure and flow rate of the test medium in the reactor 1 are adjusted to normal temperature and pressure. For temperature, the heater 9 of the reactor 1 can be used to stabilize it at about 25°C; for pressure, the pressure in the reactor 1 can be made to reach about 101.325 kPa by using a pressure regulating device such as a booster pump; for the flow rate of the test medium, the speed of the stirrer 2 can be adjusted to control it at an extremely low flow rate level to simulate a static or nearly static medium state. Then, the gradient is set according to the design parameters of the object to be evaluated, and the influence of different operating conditions on the corrosion of the test piece 4 is systematically studied. By gradually increasing these parameters, various working conditions that may be encountered in actual use can be simulated, which helps to comprehensively evaluate the corrosion risk of the object to be evaluated under different working conditions. It should be noted that the preset gradient can be determined based on actual experience, industry standards or theoretical calculations to ensure that the possible operating range of the object to be evaluated is covered. Conducting multiple groups of simulation tests can obtain corrosion data under different working conditions. By comparing the data of different groups, the influence of different parameter combinations on the corrosion of the test piece 4 is analyzed, providing more comprehensive and detailed data support for corrosion risk assessment. In addition, the parameter combinations of different groups of experiments constitute a parameter matrix, which helps researchers discover the interactive effects of various parameters on corrosion.

[0023] Step S102: respectively collecting reference corrosion parameters corresponding to the test pieces 4 in each layer of the test frame 3 in multiple groups of simulation tests, and selecting characteristic parameters from the multiple groups of reference corrosion parameters.

[0024] In this embodiment, after each set of simulation tests, relevant corrosion data is collected for each test piece 4 on the three layers of the test frame 3. These data are reference corrosion parameters, such as the corrosion rate of the test piece 4. From the numerous reference corrosion parameters, the characteristic parameters that best represent the overall corrosion characteristics are selected. For example, the maximum corrosion rate can be selected as the characteristic parameter to characterize the most serious corrosion situation, so as to facilitate subsequent comparative analysis.

[0025] Here, after each set of simulation tests is completed, relevant corrosion data of each test piece 4 on the three layers of the test frame 3 can be collected by various methods such as weight loss method, electrochemical method (such as using galvanic corrosion sensor 5).

[0026] Step S103: Replace the test pieces 4 in each layer of the test rack 3, set the temperature and pressure in the reactor 1 and the flow rate of the test medium in the reactor 1 with reference to the actual operating parameters of the object to be evaluated, and conduct a comparative test.

[0027] In this embodiment, according to the operating parameters of the object to be evaluated in actual work, the temperature, pressure and flow rate of the test medium in the reactor 1 are adjusted to a range consistent with or close to the actual pipeline, simulating the real working scene of the object to be evaluated, so that the comparative test results are more in line with the actual situation. For example, if the oil and gas pipeline to be evaluated is in a high-temperature operation state in a certain section, and the operating temperature is between 80°C and 120°C, it is necessary to accurately adjust the temperature in the reactor 1 to this range. Specifically, in actual applications, a heating element such as a heater 9 can be set on the outer wall of the reactor 1 to achieve this. The heating element such as the heater 9 keeps the temperature in the reactor 1 in the target range by heating or cooling according to the set target temperature. At the same time, the inner cavity of the reactor 1 can be connected to a pressure regulating device such as a booster pump to adjust the pressure in the reactor 1 to match the pressure level of the actual pipeline. At the same time, the rotation speed of the stirrer 2 in the reactor 1 is adjusted so that the flow rate of the test medium in the reactor 1 reaches a level similar to that of the actual pipeline. When the above temperature, pressure and flow rate parameters are set, the comparative test is started. It should be noted that, through the implementation of step S103, a corrosion test scenario that is highly similar to the actual operating environment of oil and gas pipelines can be constructed in a laboratory environment, providing a basis and prerequisite for subsequent corrosion risk assessment, etc., so that the corrosion problems that oil and gas pipelines may face under actual working conditions can be grasped in advance at a lower cost and higher safety, and a basis can be provided for optimizing the design, operation and maintenance of pipelines.

[0028] Here, in order to ensure the independence and reliability of the comparative test and avoid the influence of the simulation test on the subsequent comparative test results, it is necessary to replace the test pieces 4 on each layer of the test rack 3. The simulation test may cause certain physical and chemical changes on the surface of the test piece 4, such as the formation of corrosion products and changes in surface roughness, which will interfere with the accuracy of the subsequent comparative test. Therefore, using new test pieces 4 that have not been affected by the simulation test can ensure that the comparative test starts under the same initial conditions and ensure the comparability of the comparative test results.

[0029] Step S104: Collecting actual corrosion parameters corresponding to the test piece 4 in each layer of the test rack 3 in the comparative test, the actual corrosion parameters include the actual corrosion rate of the test piece 4 in the gaseous test medium, the actual corrosion rate in the liquid test medium and the actual corrosion rate in the gas-liquid dual-state test medium.

[0030] In this embodiment, after completing the comparative test of step S103, it is necessary to quantitatively analyze the test results, and collecting the actual corrosion parameters of the test piece 4 under different medium states is a key link in evaluating the degree of corrosion and risk. These parameters can directly reflect the corrosion rate of the test piece 4 representing the pipeline components in the oil and gas pipeline under different environmental conditions under actual working conditions, and provide important data support for the subsequent comprehensive understanding of the corrosion of the pipeline, analysis of the corrosion mechanism, and formulation of protective measures. Specifically, the test rack 3 is arranged in three layers in the vertical direction, and the test medium environment in each layer of the test piece 4 is different. The upper test piece 4 is in a gaseous test medium environment, simulating the pipeline components in the gas phase space part of the oil and gas pipeline, such as the pipeline part above the liquid surface or the gas gathering area; the middle test piece 4 is at the gas-liquid interface, which is a special corrosion environment, and is affected by the liquid and gas test media at the same time, corresponding to the pipeline components at the gas-liquid interface position in the actual pipeline; the lower test piece 4 is completely immersed in the liquid test medium, simulating the pipeline components that are in the underwater or liquid environment for a long time.

[0031] Here, by collecting data for each layer of the test piece 4 respectively, that is, collecting the corrosion rate under different phases, it is possible to fully understand the corrosion conditions of the test piece 4 under various actual environments, and provide more abundant data for subsequent evaluation.

[0032] Step S105: Compare the actual corrosion parameters with the characteristic parameters according to the phase classification, and adjust the actual operating parameters of the object to be evaluated based on the comparison result.

[0033] In this embodiment, the actual corrosion parameters obtained in the comparative test are classified into gas state, liquid state and gas-liquid state, and then compared with the characteristic parameters selected in step S102 respectively.

[0034] Here, the characteristic parameter is the maximum value of multiple reference corrosion parameters, which is used to characterize the most serious corrosion situation. Therefore, by comparing the characteristic parameter with the actual corrosion parameter in the same phase state, it can be evaluated whether the actual operating parameter corresponding to the actual corrosion parameter needs to be adjusted.

[0035] By applying the technical solution of this embodiment, the test frame 3 is set in three layers in the vertical direction, and the test medium liquid level is controlled at the middle layer position, so that the corrosion of the test piece 4 at different height positions in different gas-liquid phases and gas-liquid interfaces can be simulated, and the different corrosion environments that may exist in metal structures in practical applications can be more comprehensively reflected. By starting from normal temperature and pressure in multiple groups of simulation tests, the temperature, pressure and flow rate of the test medium in the reactor 1 are gradually increased according to the preset gradient and design parameters, and the corresponding reference corrosion parameters are collected, the influence of different operating parameters on the corrosion rate can be systematically studied, and a scientific basis can be provided for determining the optimal operating parameters. By selecting characteristic parameters from multiple groups of reference corrosion parameters, the operating parameter combination of the temperature, pressure and flow rate of the test medium in the reactor 1 that causes the most serious corrosion can be determined. By referring to the actual operating parameters of the object to be evaluated, the temperature, pressure and flow rate of the test medium in the reactor 1 are set, and the real working environment of the object to be evaluated can be highly restored, so that the comparative test results conducted in the corrosion test system can truly reflect the corrosion of the metal structure in the object to be evaluated under actual working conditions, and the accuracy and reliability of the test results are improved. By collecting the actual corrosion parameters of the test piece 4 in the gaseous, liquid and gas-liquid test media, a rich and detailed data basis is provided for the subsequent corrosion risk assessment, which can fully demonstrate the corrosion characteristics of metal structures in different medium phases and help to gain a deeper understanding of the corrosion mechanism. By comparing the actual corrosion parameters and characteristic parameters based on phase classification, the changing trend and difference of the corrosion rate under different operating parameters can be clearly analyzed, and the actual operating parameters of the object to be evaluated can be adjusted based on this comparison result, which is highly targeted and scientific. By optimizing the actual operating parameters, the corrosion risk of the metal structure in the object to be evaluated can be effectively reduced, the service life of the object to be evaluated can be extended, the maintenance and replacement costs of the object to be evaluated can be reduced, and the safety and stability of production can be improved, thereby bringing significant economic and social benefits to the enterprise.

[0036] Further, as a refinement and extension of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another corrosion risk assessment method is provided, which includes: Step S201: Starting from normal temperature and pressure, according to a preset gradient and design parameters of the object to be evaluated, the temperature and pressure in the reactor 1 and the flow rate of the test medium in the reactor 1 are gradually increased to carry out multiple groups of simulation tests; Step S202: respectively collecting reference corrosion parameters corresponding to the test pieces 4 in each layer of the test rack 3 in multiple groups of simulation tests, and selecting characteristic parameters from the multiple groups of reference corrosion parameters; Step S203: Replace the test pieces 4 in each layer of the test rack 3, set the temperature and pressure in the reactor 1 and the flow rate of the test medium in the reactor 1 with reference to the actual operating parameters of the object to be evaluated, and conduct a comparative test; Step S204: collecting actual corrosion parameters corresponding to the test pieces 4 in each layer of the test rack 3 in the comparative test, the actual corrosion parameters including the actual corrosion rate of the test piece 4 in the gaseous test medium, the actual corrosion rate in the liquid test medium, and the actual corrosion rate in the gas-liquid dual-state test medium; Step S205: Compare the actual corrosion parameters with the characteristic parameters according to the phase classification, and adjust the actual operating parameters of the object to be evaluated based on the comparison result.

[0037] Wherein, step S202 includes: Step S2021: Before carrying out multiple groups of simulation tests, for each group of simulation tests, each test piece 4 in each layer of the test rack 3 is weighed in turn, and the initial weight of each test piece 4 in each layer of the test rack 3 in each group of simulation tests is recorded.

[0038] In this embodiment, before conducting each set of simulation tests, each test piece 4 placed in the three layers of the test frame 3 needs to be weighed to obtain the initial weight of each test piece 4 before the start of the test, so as to provide basic data for the subsequent calculation of the degree of corrosion and ensure that the weight change of the test piece 4 caused by corrosion and other factors during the simulation test can be accurately measured.

[0039] Here, high-precision weighing equipment, such as an electronic balance, can be used to accurately weigh each test piece 4 placed on each layer of the test rack 3, and then the initial weight of each test piece 4 on each layer of the test rack 3 is recorded in detail, including the layer number of the test rack 3 where the test piece 4 is located, the corresponding position number and the precise weight value.

[0040] Step S2022: After multiple groups of simulation tests are completed, for each group of simulation tests, each test piece 4 in each layer of the test rack 3 is weighed again in turn, and the final weight of each test piece 4 in each layer of the test rack 3 in each group of simulation tests is recorded.

[0041] In this embodiment, after all the multiple groups of simulation tests are completed, each test piece 4 on each layer of the test rack 3 is weighed again in turn. At this time, the final weight of each test piece 4 after the simulation test is recorded, and by comparing it with the initial weight, the weight change of the test piece 4 during the simulation test can be known.

[0042] Here, the same weighing equipment as before the simulation test is used to weigh each test piece 4 on each layer of the test rack 3 again, and the final weight is recorded. Similarly, the record should be detailed and accurate, corresponding to the specific position and number of each test piece 4.

[0043] Step S2023: Calculate the corrosion rate of each test piece 4 on each layer of the test frame 3 in each group of simulation tests based on the weight loss method to obtain multiple groups of reference corrosion parameters.

[0044] In this embodiment, the weight loss method is used to calculate the corrosion rate of each test piece 4. The weight loss method is to calculate the corrosion rate of the test piece 4 in the simulated test environment based on the weight difference of the test piece 4 before and after the simulation test, combined with factors such as the test time and the area of ​​the test piece 4. These corrosion rate data constitute multiple groups of reference corrosion parameters to reflect the corrosion conditions of the test piece 4 under different simulation test conditions.

[0045] Here, the initial weight (m0) of specimen 4, the final weight (m1) of specimen 4, the surface area (S) of specimen 4 and the time (t) of the simulation test are substituted into the corrosion rate formula v = (m0-m1) / St for calculating the corrosion rate by the weight loss method, and the corrosion rate of each specimen 4 in each layer of the test rack 3 under the simulation test is obtained, providing key data for the subsequent corrosion risk assessment.

[0046] Step S2024: Screen and determine the reference corrosion parameter with the largest value among the multiple groups of reference corrosion parameters, and use it as the characteristic parameter.

[0047] In this embodiment, the reference corrosion parameter with the largest value is selected from multiple groups of reference corrosion parameters and is determined as a characteristic parameter. Because the corrosion rate with the largest value can represent the most serious corrosion situation under these simulated test conditions, using it as a characteristic parameter is helpful for subsequent comparison and analysis with actual corrosion parameters to determine the difference between the corrosion situation under the actual operating parameters and the design parameters.

[0048] The corrosion test system further includes a galvanic corrosion sensor 5, at least three galvanic corrosion sensors 5 are provided, and at least three galvanic corrosion sensors 5 are provided in one-to-one correspondence with the three layers of the test frame 3; the corrosion risk assessment method further includes: Step S2025: During the continuous process of each set of simulation tests, real-time corrosion current data output by the galvanic corrosion sensors 5 corresponding to each layer of the test frame 3 is obtained in real time.

[0049] In this embodiment, during the entire simulation test, it is necessary to monitor the corrosion conditions of each layer of the test frame 3 in real time. The function of the galvanic corrosion sensor 5 is to obtain data related to corrosion so as to understand the corrosion conditions during the test more comprehensively and timely.

[0050] Here, the electrodes of the galvanic corrosion sensor 5 are composed of a metal (anode) of the same material as the sample and another metal or non-metal (cathode) that has an obvious potential difference with the metal of the sample. In practical applications, since a thin liquid film is formed on the surface of the galvanic corrosion sensor 5 or it is completely covered by the corrosive medium, a circuit is formed. Due to the potential difference between the two electrodes, a galvanic cell effect is formed, electrochemical corrosion occurs, and a corrosion current is generated. Since the anode is made of the same material as the specimen 4, the magnitude of the corrosion current flowing through the galvanic corrosion sensor 5 can indirectly reflect the corrosion rate and degree of the specimen 4. The galvanic corrosion sensor 5 monitors the corrosion condition of the specimen 4 by detecting changes in the corrosion current. In addition, since at least three galvanic corrosion sensors 5 are provided and correspond one-to-one to the three layers of the test frame 3, the corrosion conditions of the specimens 4 at different positions, i.e., in different phases, can be monitored, thereby ensuring the comprehensiveness and reliability of the data. Further, in order to achieve real-time monitoring, see. Figure 2 As shown, the corrosion test system also includes a data acquisition instrument 12, and the galvanic corrosion sensor 5 is connected to the data acquisition instrument 12. After the actual working condition simulation test begins, the galvanic corrosion sensor 5 will continuously transmit the detected corrosion current data to the data acquisition system. For example, in the actual working condition simulation test, when the temperature, pressure and flow rate of the test medium remain stable according to the actual operating parameters of the object to be evaluated, the galvanic corrosion sensor 5 can collect data at a certain time interval (such as every second, every minute or according to the accuracy requirements of the test), and this time interval depends on the sampling frequency setting of the data acquisition system, and then transmit the sensed corrosion current data to the data acquisition instrument 12 via the signal amplifier 11. Therefore, in the actual working condition simulation test, the real-time corrosion current data of the galvanic corrosion sensor 5 at different times and different test medium phases can be obtained, providing a rich data source for the subsequent real-time corrosion rate calculation.

[0051] Step S2026: Calculate the corrosion rate of the galvanic corrosion sensor 5 corresponding to each layer of the test frame 3 based on the real-time corrosion current data.

[0052] In this embodiment, after obtaining the real-time corrosion current data, it is necessary to convert it into a corrosion rate that can directly reflect the degree of corrosion, so as to more intuitively understand the corrosion conditions of each layer of the test frame 3 and provide more valuable quantitative indicators for corrosion risk assessment.

[0053] Here, see Figure 2As shown, the corrosion test system also includes a computer 13, which is connected to the data acquisition instrument 12. The computer 13 is used to receive the real-time corrosion current data transmitted by the data acquisition instrument 12 and calculate the real-time corrosion rate of the galvanic corrosion sensor 5. Specifically, in practical applications, after the data acquisition instrument 12 obtains the real-time corrosion current data in step S2025, it is uploaded to the computer 13. The computer 13 pre-stores a Faraday's law algorithm, and processes the real-time corrosion current data based on the Faraday's law. That is to say, the real-time corrosion current data is first converted into the mass loss of the galvanic corrosion sensor 5, and then further converted into the real-time corrosion rate, thereby indirectly reflecting the corrosion condition of the test piece 4.

[0054] Wherein, step S2026 includes: Step S20261: Draw a material corrosion mass loss curve, with reaction time as the independent variable and total material mass loss at different reaction times as the dependent variable, and visualize the change of total material mass loss with reaction time.

[0055] In this embodiment, the data from step S2025 is the basis for drawing the material corrosion mass loss curve. In the simulation test, by continuously monitoring the real-time corrosion current data of multiple galvanic corrosion sensors 5 at different phases and different times, these real-time corrosion current data are converted into the total material mass loss at different reaction times through Faraday's law algorithm calculation. With the reaction time as the independent variable and the total material mass loss at different reaction times as the dependent variable, a material corrosion mass loss curve is drawn. The tangent slope of each reaction time point in the material corrosion mass loss curve is the real-time corrosion rate corresponding to each reaction time. For each galvanic corrosion sensor 5 corresponding to each layer of the test frame 3, there is a corresponding real-time corrosion rate value at different reaction time points. These data include the real-time corrosion rate of the galvanic corrosion sensor 5 in the gaseous, liquid and gas-liquid test media at each time point during the entire test process. Then, the reaction time of the test piece 4 in different phases is used as the x-axis data, and the total material mass loss at different reaction times is used as the y-axis data to enter the drawing tool. For example, for the galvanic corrosion sensor 5 in the gaseous test medium, the data at different time points (from the 0 moment when the test starts, increasing in sequence at certain time intervals until the end of the test) are input, and the total material mass loss of the corresponding galvanic corrosion sensor 5 at each time point is input at the same time. In this process, in order to distinguish the galvanic corrosion sensors 5 in different phases, the data in different phases need to be grouped and plotted. For example, different colors or marks are used to distinguish the data of the galvanic corrosion sensor 5 in gaseous, liquid, and gas-liquid states, and a legend is added to the figure to clearly identify the phases represented by different curves.

[0056] Step S20262: Based on the material corrosion mass loss curve, the corrosion rate of the galvanic corrosion sensor 5 corresponding to each layer of the test frame 3 is calculated.

[0057] In this embodiment, the total material mass loss and its corresponding reaction time data of the galvanic corrosion sensor 5 at different reaction times in different phases are extracted from the material corrosion mass loss curve drawn in step S20261. For each phase, there is a series of total material mass loss data, which correspond to different total reaction times. For the galvanic corrosion sensor 5 in the gaseous test medium, the total material mass loss during the entire test period is divided by the total reaction time to obtain the corrosion rate of the galvanic corrosion sensor 5 in the phase. Similarly, the corrosion rate of the galvanic corrosion sensor 5 in the liquid test medium and the galvanic corrosion sensor 5 in the gas-liquid two-phase test medium is calculated in the same way as the corrosion rate of the galvanic corrosion sensor 5 in the gaseous test medium. Therefore, it can be judged that the galvanic corrosion sensor 5, that is, the test piece 4 is more susceptible to corrosion in which environment of the gaseous, liquid or gas-liquid two-phase test medium, providing guidance for subsequent corrosion risk assessment and actual operation parameter adjustment. It should be noted that since the corrosion process is a dynamic process, its corrosion rate may fluctuate at different time points. By calculating the average value, an indicator that can comprehensively reflect the corrosion condition of the galvanic corrosion sensor 5, i.e., the test piece 4, in this phase can be obtained, which is convenient for comparison and evaluation between different phases.

[0058] Among them, considering that the weight loss method is relatively cumbersome in operation process, and the corrosion rate of the galvanic corrosion sensor 5 can only indirectly reflect the corrosion rate of the test piece 4, in order to achieve a more accurate and comprehensive corrosion risk assessment, the corrosion risk assessment method also includes: Step S2027: for multiple groups of simulation tests, respectively sort out the corrosion rate data of the test pieces 4 on each layer of the test frame 3 in each group of simulation tests, and the corresponding corrosion rate data of the galvanic corrosion sensors 5 on each layer.

[0059] In this embodiment, work is carried out for multiple groups of simulation tests, each of which includes corrosion rate data of the test pieces 4 on each layer of the test frame 3 and corrosion rate data of the galvanic corrosion sensor 5 on the corresponding layer. The corrosion rate data of the test pieces 4 on each layer of the test frame 3 are calculated based on the weight loss method in the previous steps; the corrosion rate data of the galvanic corrosion sensor 5 is calculated based on the real-time corrosion current data output by the galvanic corrosion sensor 5.

[0060] Here, the data of each group of simulation tests are processed separately. The data can be classified and sorted according to the group of simulation tests and the number of layers of the test rack 3, for example, made into a table, each row represents a group of simulation tests, and each column records the corrosion rate of each layer of the test piece 4 in the group of tests and the corrosion rate of the corresponding galvanic corrosion sensor 5, so that the corresponding relationship of the data can be presented intuitively, which is convenient for subsequent analysis.

[0061] Step S2028: Using a data analysis method, based on the sorted corrosion rate data of multiple groups of test pieces 4 and the corrosion rate data of multiple groups of galvanic corrosion sensors 5, determine the conversion relationship between the corrosion rate of the galvanic corrosion sensor 5 and the corrosion rate of the test piece 4.

[0062] In this embodiment, by establishing a conversion relationship, the corrosion rate of the galvanic corrosion sensor 5 can be quantitatively linked to the corrosion rate of the test piece 4. The conversion relationship can comprehensively consider the characteristic differences between the galvanic corrosion sensor 5 and the test piece 4 under different test conditions, as well as the similarities and differences in the corrosion effects suffered by the two. Specifically, in the process of determining the conversion relationship, a large amount of test data must first be deeply analyzed. These data cover the real-time corrosion current data of the galvanic corrosion sensor 5 under different operating parameter conditions simulation tests, the corrosion rate calculated based on this, and the corrosion rate of the test piece 4 measured by the weight loss method. Through mathematical tools such as multivariate linear regression analysis and neural network algorithms, combined with physical and chemical principles, a mathematical expression that can accurately reflect the relationship between the two is fitted. In subsequent practical applications, when only the corrosion rate of the galvanic corrosion sensor 5 can be obtained, the corrosion rate of the test piece 4 can be accurately calculated based on the conversion relationship, thereby effectively making up for the defect that the galvanic corrosion sensor 5 cannot directly measure the corrosion rate of the test piece 4. At the same time, during the test, if the weight loss method cannot be used to measure the corrosion rate of specimen 4 due to some special circumstances, the conversion relationship can also provide key data support for corrosion risk assessment. Moreover, with the continuous accumulation of test data and the continuous expansion of test conditions, the conversion relationship can be optimized and updated to make it more in line with the actual situation, further improve the accuracy and reliability of corrosion risk assessment, provide stronger guarantees for the safe operation of oil and gas pipelines, and help related companies make more scientific and reasonable decisions in pipeline design and maintenance strategy formulation.

[0063] Wherein, step S205 includes: Step S2051: When the difference between the absolute value of the actual corrosion parameter and the characteristic parameter is within a preset setting interval, during the actual operation, the temperature and / or pressure inside the object to be evaluated and / or the flow rate of the test medium are reduced.

[0064] Here, the actual corrosion parameter is the corrosion rate data of the specimen 4 in different phases measured by various methods (such as weight loss method, electrochemical method, etc.) in the comparative test, which reflects the corrosion condition of the specimen 4 under the current actual operating parameters. The characteristic parameter is the maximum value of the reference corrosion parameter collected in multiple groups of simulation tests, representing the most serious corrosion condition. When the difference between the absolute values ​​of the two parameters is calculated and found to be within the preset setting range, this indicates that the corrosion condition under the actual operating parameters is close to the most serious corrosion condition, and there may be a high corrosion risk, and measures need to be taken to adjust it. It should be noted that the preset setting interval is determined according to specific industry standards, test experience or safety requirements, and this application does not limit this. For example, for some high-precision equipment or important industrial pipelines, the preset setting interval may be set narrower to ensure the long-term stable operation and safety of the equipment or pipeline; while for some relatively less sensitive application scenarios, the preset setting interval can be relatively loose.

[0065] In this embodiment, in order to reduce the risk of corrosion, it is necessary to adjust the parameters in the actual operation process. Since temperature, pressure and flow rate are key factors affecting the corrosion rate, reducing these parameters can change the environment in which the test piece 4 is located, thereby changing the kinetic and thermodynamic conditions of the corrosion process, thereby reducing the corrosion rate.

[0066] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, see Figure 2 As shown, the corrosion test system also includes a pressure sensor 6, a temperature sensor 7 and a flow rate sensor 8. The pressure sensor 6 is arranged on the top cover of the reactor 1, the temperature sensor 7 is arranged on the bottom wall of the reactor 1, and three flow rate sensors 8 are arranged. The three flow rate sensors 8 are all arranged on the outer wall of the reactor 1 and are arranged one by one corresponding to the three layers of the test frame 3.

[0067] Among them, the pressure sensor 6 is used to obtain the pressure information in the reactor 1 in real time to ensure the accuracy of the pressure during the test. The temperature sensor 7 is used to obtain the pressure information in the reactor 1 in real time to ensure the accuracy of the temperature during the test. The flow rate sensor 8 is used to obtain the flow rate information of the test medium in the reactor 1 in real time to ensure the accuracy of the flow rate during the test.

[0068] Specifically, in actual application, three flow velocity sensors 8 are provided, and the three flow velocity sensors 8 are provided one-to-one correspondingly to the three layers of the test frame 3, and can respectively measure the flow velocity of the test medium around the test pieces 4 in different layers, thereby realizing accurate monitoring of the flow velocity of the test medium at different positions.

[0069] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, see Figure 4 As shown, a ceramic gasket 10 is provided at the connection between the test piece 4 and the test frame 3, and the ceramic gasket 10 is used to isolate the test piece 4 from the test frame 3. Thus, it is possible to prevent the formation of a galvanic pair between the test piece 4 and the test frame 3, and protect the test piece 4 from additional corrosion damage caused by galvanic corrosion between the test piece 4 and the test frame 3, thereby ensuring that the corrosion test system can create an environment similar to the actual working conditions and improve the accuracy of the test results.

[0070] The test stand 3 includes a column and a mounting ring. The mounting ring has a three-layer structure in the vertical direction. The three-layer mounting ring is fixed on the column to form a stable frame, which provides a reliable support structure for the test piece 4 installed later.

[0071] Specifically, each layer of the mounting ring is equipped with a ceramic block, which is used to connect the test piece 4. In practical applications, the ceramic block is connected to the test piece 4 through a ceramic bolt, and the ceramic gasket 10 is arranged between the ceramic block and the test piece 4.

[0072] Further, as a refinement and expansion of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, see Figure 3 As shown, each layer of the test frame 3 is fixed with a plurality of test pieces 4, so that the corrosion test system can verify the relationship between the flow velocity and corrosion rate of the test medium under different phases.

[0073] Among them, by fixing multiple specimens 4 on each layer, the corrosion conditions of different specimens 4 under the same flow rate conditions can be studied simultaneously, and the corrosion changes of the same specimen 4 under different flow rate conditions can also be studied, providing multi-dimensional data support for the study of corrosion laws.

[0074] Specifically, multiple test pieces 4 are arranged on each layer of the test rack 3. When the multiple test pieces 4 are of the same material, shape, size and initial state, the flow rate of the test medium is changed. Since the multiple test pieces 4 are in the same phase environment (such as gas, liquid or gas-liquid) and under the same flow rate conditions, the corrosion conditions of the multiple test pieces 4 can be observed simultaneously. For example, the corrosion rate of each test piece 4 is measured by a weight loss method or a galvanic corrosion sensor 5. If the corrosion rates of multiple test pieces 4 are similar at a certain flow rate, the reliability of the corrosion rate data at the flow rate is enhanced. Moreover, by changing the flow rate, multiple corrosion rate data points corresponding to different flow rates can be obtained. These data points are helpful in drawing a flow rate-corrosion rate curve and more accurately verifying the relationship between the two.

[0075] Those skilled in the art will appreciate that the accompanying drawings are only schematic diagrams of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the description of the implementation scenario, or can be changed accordingly and located in one or more devices different from the present implementation scenario. The modules of the above-mentioned implementation scenario can be combined into one module, or can be further split into multiple submodules.

[0076] The above serial numbers of this application are only for description and do not represent the advantages and disadvantages of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of this application, but this application is not limited to them, and any changes that can be thought of by technicians in this field should fall within the scope of protection of this application.

Claims

1. A corrosion risk assessment method, applied to a corrosion test system, characterized in that: The corrosion test system comprises a reactor, a stirrer and a test stand, wherein the rotatable part of the stirrer and the test stand are both arranged in the reactor, the test stand is used to fix the test piece, the test stand is vertically arranged with three layers, the reactor is used to inject the test medium, and the liquid level of the test medium is controlled at the middle layer of the test stand; The corrosion risk assessment method comprises: Starting from normal temperature and pressure, according to a preset gradient and in accordance with the design parameters of the object to be evaluated, the temperature and pressure in the reactor and the flow rate of the test medium in the reactor are gradually increased to carry out multiple groups of simulation tests; Collecting a plurality of groups of reference corrosion parameters corresponding to the test pieces in each layer of the test frame in the simulation test respectively, and selecting characteristic parameters from the plurality of groups of reference corrosion parameters; Replace the test pieces in each layer of the test rack, set the temperature and pressure in the reactor and the flow rate of the test medium in the reactor with reference to the actual operating parameters of the object to be evaluated, and conduct a comparative test; Collecting actual corrosion parameters corresponding to the test pieces in each layer of the test rack in the comparative test, the actual corrosion parameters including the actual corrosion rate of the test pieces in the gaseous test medium, the actual corrosion rate in the liquid test medium, and the actual corrosion rate in the test medium in both gas and liquid states; The actual corrosion parameter is compared with the characteristic parameter according to the phase classification, and the actual operating parameter of the object to be evaluated is adjusted based on the comparison result.

2. The corrosion risk assessment method according to claim 1, characterized in that: The collecting of multiple groups of reference corrosion parameters corresponding to the test pieces in each layer of the test frame in the simulation test and selecting characteristic parameters from the multiple groups of reference corrosion parameters includes: Before carrying out multiple groups of simulation tests, for each group of simulation tests, weigh each of the test pieces in each layer of the test rack in turn, and record the initial weight of each of the test pieces in each layer of the test rack in each group of simulation tests; After the multiple groups of simulation tests are completed, for each group of simulation tests, each of the test pieces in each layer of the test rack is weighed again in turn, and the final weight of each of the test pieces in each layer of the test rack in each group of simulation tests is recorded; Calculate the corrosion rate of each test piece on each layer of the test frame in each group of simulation tests based on the weight loss method to obtain multiple groups of reference corrosion parameters; The reference corrosion parameter with the largest value among the multiple groups of reference corrosion parameters is screened and determined, and is used as the characteristic parameter.

3. The corrosion risk assessment method according to claim 2, characterized in that: The corrosion test system further includes a galvanic corrosion sensor, at least three of which are provided, and the at least three galvanic corrosion sensors are provided in one-to-one correspondence with the three layers of the test frame; the corrosion risk assessment method further includes: During the continuous process of each group of simulation tests, real-time corrosion current data output by the galvanic corrosion sensors corresponding to each layer of the test frame are obtained in real time; The corrosion rates of the galvanic corrosion sensors corresponding to each layer of the test frame are calculated based on the real-time corrosion current data.

4. The corrosion risk assessment method according to claim 3, characterized in that: The calculating the corrosion rate of the galvanic corrosion sensor corresponding to each layer of the test frame based on the real-time corrosion current data includes: Draw a material corrosion mass loss curve graph, with reaction time as the independent variable and total material mass loss at different reaction times as the dependent variable, and visualize the change of total material mass loss with the reaction time; Based on the material corrosion mass loss curve, the corrosion rate of the galvanic corrosion sensor corresponding to each layer of the test frame is calculated.

5. The corrosion risk assessment method according to claim 3, characterized in that: After calculating the corrosion rate of the galvanic corrosion sensor corresponding to each layer of the test frame based on the real-time corrosion current data, the corrosion risk assessment method further includes: For the plurality of groups of simulation tests, respectively sorting out the corrosion rate data of the test pieces on each layer of the test rack in each group of simulation tests and the corresponding corrosion rate data of the galvanic corrosion sensors on each layer; Using a data analysis method, based on the sorted corrosion rate data of multiple groups of the test pieces and the corrosion rate data of multiple groups of the galvanic corrosion sensors, a conversion relationship between the corrosion rate of the galvanic corrosion sensor and the corrosion rate of the test piece is determined.

6. The corrosion risk assessment method according to claim 1, characterized in that: The comparing the actual corrosion parameter with the characteristic parameter according to the phase classification and adjusting the actual operating parameter of the object to be evaluated based on the comparison result comprises: When the difference between the absolute value of the actual corrosion parameter and the characteristic parameter is within a preset setting interval, during actual operation, the temperature and / or pressure inside the object to be evaluated and / or the flow rate of the test medium are reduced.

7. The corrosion risk assessment method according to claim 1, characterized in that: A plurality of the test pieces are fixed on each layer of the test rack, so that the corrosion test system can verify the relationship between the flow rate of the test medium and the corrosion rate of the test piece in different phases.

8. The corrosion risk assessment method according to claim 1, characterized in that: The corrosion test system also includes a pressure sensor, a temperature sensor and a flow rate sensor. The pressure sensor is arranged on the top cover of the reactor, the temperature sensor is arranged on the bottom wall of the reactor, and three flow rate sensors are arranged. The three flow rate sensors are all arranged on the outer wall of the reactor and are arranged one by one corresponding to the three layers of the test frame.

9. The corrosion risk assessment method according to claim 1, characterized in that: The corrosion test system also includes a booster pump and a heater. The booster pump is connected to the inner cavity of the reactor and is used to adjust the pressure inside the reactor. The heater is arranged on the outer wall of the reactor and is used to adjust the temperature inside the reactor.

10. The corrosion risk assessment method according to claim 1, characterized in that: A ceramic gasket is provided at the connection between the test piece and the test frame, and the ceramic gasket is used to isolate the test piece from the test frame.

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