A method for rapid evaluation of material corrosion rate and influencing factors in high-level waste geological disposal environment

Abstract

The present application relates to the field of metal corrosion behavior monitoring and characterization, in particular to a rapid evaluation method of material corrosion rate and influencing factors in high-level waste geological disposal environment. The method is based on electrochemical impedance spectroscopy measurement and relaxation time distribution analysis to obtain two indexes, namely: the impedance modulus value |Z| 0.01Hz corresponding to 0.01 Hz and the time constant log(τ / s) value corresponding to dissolved oxygen reduction reaction. The |Z| 0.01Hz value and the log(τ / s) value when the material is in the state of oxygen corrosion and oxygen-free corrosion are critical points. According to the |Z| 0.01Hz value and the log(τ / s) value obtained by measurement, it is determined whether the material is in the state of oxygen corrosion, low-oxygen corrosion or oxygen-free corrosion, and whether the coverage of the corrosion product on the material surface and the oxygen leakage in the disposal environment occur. The present application is suitable for rapid evaluation of material corrosion rate and influencing factors in high-level waste geological disposal environment, and has the characteristics of simple method, strong operability, high accuracy and good long-term stability.

Description

Technical Field

[0001] This invention relates to the field of metal corrosion behavior monitoring and characterization, and in particular to a rapid evaluation method for the corrosion rate and influencing factors of materials in high-level radioactive waste geological disposal environments. Background Technology

[0002] High-level radioactive waste (HRF) mainly refers to high-level radioactive liquids and their solidified forms generated from spent fuel reprocessing. HRF is a special type of waste that poses a potentially enormous threat to the environment. The radionuclides contained in HRF are characterized by high radioactivity, high toxicity, long half-lives, and pyrophoric activity. Once they enter the human environment, they cause immense harm and are difficult to eliminate. Therefore, the safe disposal of HRF has become a major issue affecting the sustainable development of nuclear energy, environmental protection, and the well-being of future generations, and it is also a significant scientific, technological, and engineering challenge.

[0003] Currently, the internationally recognized method for the safe disposal of high-level radioactive waste is deep geological disposal, which involves burying the waste in stable geological formations at depths of approximately 400–1000 meters below the surface, effectively isolating it from the biosphere. Disposal containers are typically constructed of metal, and their primary safety function is to contain the high-level waste, prevent groundwater intrusion, and maintain this containment for at least 1000 years. Therefore, research on the corrosion evolution behavior of disposal container materials in geological disposal reservoir environments is essential.

[0004] Since a certain amount of oxygen will inevitably remain in the storage facility for a considerable period after its closure, the consumption and evolution of dissolved oxygen will directly affect the corrosion rate of the storage container materials. Furthermore, oxygen leakage from the storage facility will significantly impact the corrosion of the storage container materials, accelerating their containment failure. Therefore, it is essential to develop rapid evaluation methods for material corrosion rates and influencing factors in high-level radioactive waste geological storage environments to better study the corrosion evolution behavior and characteristics of storage container materials and to identify oxygen leakage accidents. Summary of the Invention

[0005] In response to the needs of high-level radioactive waste geological disposal engineering, the purpose of this invention is to provide a rapid evaluation method for the corrosion rate and influencing factors of materials in the geological disposal environment of high-level radioactive waste. This evaluation method has a clear principle, simple steps, and readily available parameters. Moreover, the evaluation method has high accuracy, strong operability, and good long-term stability, and is suitable for the rapid evaluation of the corrosion rate and influencing factors of materials in the geological disposal environment of high-level radioactive waste.

[0006] A rapid evaluation method for material corrosion rate and influencing factors in high-level radioactive waste geological disposal environments is proposed. Two indicators are obtained through electrochemical impedance spectroscopy (EIS) measurement and relaxation time distribution (DRT) analysis of the EIS data: one is the impedance modulus value corresponding to 0.01 Hz, i.e., |Z|. 0.01Hz The value is one of the two: the time constant corresponding to the dissolved oxygen reduction reaction, i.e., the log(τ / s) value.

[0007] The materials used in the geological disposal environment of high-level radioactive waste, which are used to simulate the materials of geological disposal containers for high-level radioactive waste, include low-carbon steel, copper, cast iron, nickel-based alloys, and titanium alloys.

[0008] The geological environment for the disposal of high-level radioactive waste includes the groundwater environment of the rock strata surrounding the disposal reservoir and the backfill material environment around the disposal container, including bentonite with different moisture contents.

[0009] The corrosion system described herein is used to simulate the closed environment characteristics of a high-level radioactive waste geological disposal repository. Depending on the environment of the repository and the characteristics of the surrounding rock strata and groundwater, the environmental parameters of the closed system vary, such as SO4. 2- Concentration, Cl - Concentration, HCO3 - / CO3 2- Concentration, pH value, pressure, and moisture content of backfill material;

[0010] The electrochemical impedance spectroscopy measurement first involves processing the candidate material into a working electrode for corrosion electrochemical testing, and then using a traditional three-electrode system or a two-electrode system to acquire EIS data from the working electrode, with the lower limit of the acquisition frequency not lower than 0.01 Hz.

[0011] The |Z| 0.01Hz The value is obtained by reading the impedance modulus value corresponding to 0.01 Hz in the electrochemical impedance spectroscopy impedance modulus graph, and is used to reflect the ease with which the candidate material undergoes electrochemical polarization in the geological disposal environment of high-level radioactive waste.

[0012] The log(τ / s) value is obtained by DRT analysis of the measured electrochemical impedance spectroscopy and is used to reflect the ease with which dissolved oxygen undergoes a reduction reaction in the corrosion system. It is related to the dissolved oxygen content.

[0013] This method derives two indices based on electrochemical impedance spectroscopy measurements and relaxation time distribution analysis: the impedance modulus |Z| corresponding to 0.01 Hz. 0.01Hz The value and the time constant log(τ / s) corresponding to the dissolved oxygen reduction reaction; the |Z| value when the material transitions from aerobic corrosion to anaerobic corrosion. 0.01Hz The value and log(τ / s) are the critical points, with the log(τ / s) value evolving into the X-axis and |Z| as the boundary. 0.01HzThe value evolves to the Y-axis, constructing log(τ / s)-|Z| 0.01Hz Planar coordinate system.

[0014] When the measured |Z| 0.01Hz The values ​​of the log(τ / s) and log(τ / s) lie in log(τ / s) - |Z| 0.01Hz The third quadrant of the plane coordinate system represents the corresponding corrosion system with sufficient dissolved oxygen content, the candidate material is in the aerobic corrosion stage, and the coverage of corrosion products on the surface of the candidate material is low. At this time, the corrosion rate of low carbon steel is >24.5μm / y.

[0015] When the measured |Z| 0.01Hz The values ​​of the log(τ / s) and log(τ / s) lie in log(τ / s) - |Z| 0.01Hz The fourth quadrant of the plane coordinate system represents the corresponding corrosion system with sufficient dissolved oxygen content. The candidate material is in the aerobic corrosion stage, but the surface of the candidate material already has a large amount of corrosion products covering it, that is, the coverage of corrosion products is high.

[0016] When the measured |Z| 0.01Hz The values ​​of the log(τ / s) and log(τ / s) lie in log(τ / s) - |Z| 0.01Hz The second quadrant of the plane coordinate system represents the low dissolved oxygen content in the corresponding corrosion system, indicating that the candidate material is in the low-oxygen corrosion stage, at which point the corrosion rate of low-carbon steel is <24.5μm / y.

[0017] When the measured |Z| 0.01Hz The values ​​of the log(τ / s) and log(τ / s) lie in log(τ / s) - |Z| 0.01Hz The first quadrant of the plane coordinate system represents the area where dissolved oxygen has been consumed in the corresponding corrosion system, and the candidate material has entered the oxygen-free corrosion stage.

[0018] When the measured |Z| 0.01Hz The values ​​of log(τ / s) and log(τ / s) are presented from log(τ / s) - |Z| 0.01Hz The tendency of the third or fourth quadrant of the plane coordinate system to move towards the first or second quadrant indicates that the oxygen in the corrosion system is gradually consumed by the corrosion reaction, and the oxygen content in the corrosion system gradually decreases.

[0019] When the measured |Z| 0.01Hz The values ​​of log(τ / s) and log(τ / s) are presented from log(τ / s) - |Z| 0.01Hz A tendency for the corrosion system to shift from the first or second quadrant to the third or fourth quadrant in a plane coordinate system indicates a leak in the corrosion system, with external oxygen entering the system.

[0020] This invention utilizes the technical advantage of DRT analysis, which can identify time constants contained in EIS spectra and correlate them with electrochemical reactions involved in the corrosion process. DRT analysis identifies the time constant corresponding to dissolved oxygen reduction. Furthermore, since the time constant log(τ / s) corresponding to dissolved oxygen reduction is closely related to the oxygen concentration, the evolution of the log(τ / s) value can be used to further determine the evolution of dissolved oxygen concentration in the corrosion system and the occurrence of oxygen leakage accidents in the corrosion system.

[0021] Although both increased surface coverage of corrosion products on the candidate material for the treatment container and decreased oxidizability of the corrosion system lead to a rapid increase in the time constant, the change in polarization resistance caused by corrosion product accumulation is not significant. However, a gradual decrease in oxygen partial pressure can cause an order-of-magnitude increase in polarization resistance. Both the increase in time constant and the increase in polarization resistance imply a decrease in the corrosion rate of the candidate material for the treatment container within the corrosion system. Therefore, through a single EIS measurement, two parameters closely related to the corrosion rate of the candidate material for the treatment container within the corrosion system can be obtained simultaneously: |Z| 0.01Hz The two parameters are the value and the log(τ / s) value.

[0022] Based on the |Z| measured during material corrosion in the geological disposal environment of high-level radioactive waste 0.01Hz The value and the log(τ / s) value in log(τ / s)-|Z| 0.01Hz The quadrant position in the coordinate system allows for rapid evaluation of the evolution of material corrosion rates in geological disposal environments for high-level radioactive waste and the impact of oxygen leakage from the disposal reservoir. It features simple methods, readily available parameters, strong operability, high accuracy, good long-term stability, and real-time evaluation.

[0023] The advantages and beneficial effects of this invention are:

[0024] The EIS measurement based on three-electrode and two-electrode systems used in this invention is a commonly used method in the field of corrosion electrochemistry. Furthermore, the DRT analysis method for EIS data is simple, highly accurate, and accurately identifies the evolution of the time constant log(τ / s) corresponding to the dissolved oxygen reduction process during aerobic / anaerobic corrosion. Therefore, only |Z| is needed. 0.01Hz The two parameters, log(τ / s) and log(τ / s), can accurately evaluate the evolution of material corrosion rate in the geological disposal environment of high-level radioactive waste and the impact of oxygen leakage factors in the disposal reservoir, effectively avoiding the disadvantages of low accuracy and complexity of traditional identification methods.

[0025] The rapid evaluation method for material corrosion rate and influencing factors in high-level radioactive waste geological disposal environment provided by this invention has simple steps, clear principles, high identification accuracy, and is easy to implement with readily available parameters and strong operability. It is suitable for the rapid evaluation and identification of material corrosion rate evolution and oxygen leakage accidents in disposal reservoirs in high-level radioactive waste geological disposal environment. Attached Figure Description

[0026] Figure 1 Corrosion of Q345R low-carbon steel in the open groundwater environment of the Beishan treatment reservoir with an initial oxygen concentration of 8 ppm |Z| 0.01Hz The evolution of the two parameters, value and log(τ / s), over corrosion time is shown in the figure.

[0027] Figure 2 Corrosion of Q345R low-carbon steel in the closed Beishan treatment reservoir groundwater environment with an initial oxygen concentration of 8 ppm |Z| 0.01Hz The evolution of the two parameters, value and log(τ / s), over corrosion time is shown in the figure.

[0028] Figure 3 The initial oxygen concentration is 10 -4 Corrosion of Q345R low carbon steel in the closed Beishan treatment reservoir groundwater environment |Z| 0.01Hz The evolution of the two parameters, value and log(τ / s), over corrosion time is shown in the figure.

[0029] Figure 4 The initial oxygen concentration is 10 -4 After a period of corrosion of Q345R low carbon steel in the open-pit Beishan treatment reservoir groundwater environment, the steel was removed from the glove box. |Z| 0.01Hz The graph shows the evolution of the two parameters, the value of τ and the log(τ / s), over time.

[0030] The present invention will be further described in detail below through embodiments. Specific Implementation

[0031] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Typical embodiments of the invention are shown in the drawings. However, the present invention is applicable to many different scenarios and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0032] It should be noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0033] Example 1

[0034] In this embodiment, the corrosion simulation solution uses groundwater from Beishan Reservoir BS-01, which is boiled and cooled under normal room temperature and pressure conditions before use. At this time, the oxygen content in the water is about 8 ppm.

[0035] Two electrodes made of Q345R low carbon steel were exposed to 400 mL of groundwater and left to stand in an open environment at room temperature and normal pressure. Under these conditions, the dissolved oxygen content in the corrosive solution could always be considered to be about 8 ppm.

[0036] During the corrosion process, EIS spectra were measured on two electrodes made of Q345R low-carbon steel, and DRT was used to analyze the EIS spectra to obtain the log(τ / s) value, and |Z| was recorded. 0.01Hz The evolution curves of the value and log(τ / s) with corrosion time.

[0037] Depend on Figure 1 This shows that during the corrosion process, |Z| 0.01Hz The value fluctuates slightly and is considered to change little. However, as corrosion products gradually accumulate on the surface of the Q345R low-carbon steel electrode, the log(τ / s) value shows an increasing trend. At this point, the corrosion rate of the low-carbon steel is >24.5 μm / y, and the measured |Z| 0.01Hz The values ​​of the log(τ / s) and log(τ / s) lie in log(τ / s) - |Z| 0.01Hz The third quadrant of the coordinate system corresponds to a time when the dissolved oxygen content in the corrosion system is sufficient, the candidate material is in the aerobic corrosion stage, and the coverage of corrosion products on the surface of the candidate material is low.

[0038] As can be seen, the results of this embodiment show that the rapid evaluation method for material corrosion rate and influencing factors in the geological disposal environment of high-level radioactive waste of the present invention is applicable to the rapid evaluation of material corrosion rate in the geological disposal environment of high-level radioactive waste.

[0039] Example 2

[0040] In this embodiment, the corrosion simulation solution uses groundwater from Beishan Reservoir BS-01, which is boiled and cooled under normal room temperature and pressure conditions before use. At this time, the oxygen content in the water is about 8 ppm.

[0041] The corrosion system was prepared in an atmospheric environment. Two electrodes made of Q345R low-carbon steel were exposed to 400 mL of groundwater. The corrosion system was then sealed at room temperature and atmospheric pressure to isolate it from the surrounding air environment. At this time, the initial oxygen content in the corrosion solution was approximately 8 ppm.

[0042] During the corrosion process, EIS spectra were measured on two electrodes made of Q345R low-carbon steel, and DRT was used to analyze the EIS spectra to obtain the log(τ / s) value, and |Z| was recorded. 0.01Hz The evolution curves of the value and log(τ / s) with corrosion time.

[0043] Depend on Figure 2 The results show that in the early stages of corrosion, the dissolved oxygen content in the corrosion system is relatively high, and the measured |Z| 0.01HzThe values ​​of the log(τ / s) and log(τ / s) lie in log(τ / s) - |Z| 0.01Hz In the third quadrant of the coordinate system, the corrosion rate of low-carbon steel is >24.5 μm / y. However, with the extension of corrosion time, the rapid consumption of dissolved oxygen leads to a decrease in the measured |Z|. 0.01Hz The value and the log(τ / s) value are quickly shifted to log(τ / s) - |Z| 0.01Hz The second quadrant of the coordinate system; thereafter, as erosion continues, |Z| 0.01Hz The value fluctuates little and is considered to change little. However, as corrosion products gradually accumulate on the surface of the Q345R low-carbon steel electrode, the log(τ / s) value shows an increasing trend. At this point, the corrosion rate of the low-carbon steel is <24.5 μm / y, and the measured |Z| 0.01Hz The values ​​of log(τ / s) and log(τ / s) gradually shift towards log(τ / s) - |Z| 0.01Hz The trend of the first quadrant of the coordinate system shifts corresponds to the gradual consumption and further reduction of dissolved oxygen in the corrosion system at this time, and the candidate material gradually changes from the low-oxygen corrosion stage to the oxygen-free corrosion stage.

[0044] As can be seen, the results of this embodiment show that the rapid evaluation method for material corrosion rate and influencing factors in the geological disposal environment of high-level radioactive waste of the present invention is applicable to the rapid evaluation of material corrosion rate in the geological disposal environment of high-level radioactive waste.

[0045] Example 3

[0046] In this embodiment, the corrosion simulation solution uses groundwater from Beishan Reservoir BS-01, which is boiled and cooled under normal room temperature and pressure conditions before use. At this time, the oxygen content in the water is about 8 ppm.

[0047] The corrosion system was prepared in a low-oxygen glove box (gas phase oxygen content less than 0.1 ppm). The corrosion simulation solution and two electrodes made of Q345R low-carbon steel were placed in the glove box. The corrosion system was then prepared and sealed; at this point, the initial dissolved oxygen content in the corrosion solution was approximately 10... -4 ppb.

[0048] During the corrosion process, EIS spectra were measured on two electrodes made of Q345R low-carbon steel, and DRT was used to analyze the EIS spectra to obtain the log(τ / s) value, and |Z| was recorded. 0.01Hz The evolution curves of the value and log(τ / s) with corrosion time.

[0049] Depend on Figure 3 The results show that, in the early stages of corrosion, the measured |Z| 0.01Hz The values ​​of the log(τ / s) and log(τ / s) lie in log(τ / s) - |Z| 0.01HzThe second quadrant of the coordinate system, but with the extension of corrosion time and the gradual accumulation of corrosion products on the surface of the Q345R low carbon steel electrode, |Z| 0.01Hz The values ​​of log(τ / s) and log(τ / s) show a trend toward log(τ / s) - |Z| 0.01Hz The trend of the first quadrant of the coordinate system shifts corresponds to the gradual consumption and further reduction of dissolved oxygen in the corrosion system at this time, and the candidate material gradually changes from the low-oxygen corrosion stage to the oxygen-free corrosion stage.

[0050] As can be seen, the results of this embodiment show that the rapid evaluation method for material corrosion rate and influencing factors in high-level radioactive waste geological disposal environment of the present invention is applicable to the rapid evaluation of the aerobic / anaerobic corrosion transition of materials in high-level radioactive waste geological disposal environment.

[0051] Example 4

[0052] In this embodiment, the corrosion simulation solution uses groundwater from Beishan Reservoir BS-01, which is boiled and cooled under normal room temperature and pressure conditions before use. At this time, the oxygen content in the water is about 8 ppm.

[0053] The corrosion system was prepared in a low-oxygen glove box (gas phase oxygen content less than 0.1 ppm). The corrosion simulation solution and two electrodes made of Q345R low-carbon steel were placed in the glove box. Then, the corrosion system was prepared by exposing the two Q345R low-carbon steel electrodes to 400 mL of groundwater, leaving them exposed to the atmospheric environment within the glove box. At this point, the dissolved oxygen content in the corrosion solution could always be considered to be approximately 10%. -4 ppb. After a period of corrosion, remove the open corroded system from the glove box and expose it to the indoor atmospheric environment.

[0054] During the corrosion process, EIS spectra were measured on two electrodes made of Q345R low-carbon steel, and DRT was used to analyze the EIS spectra to obtain the log(τ / s) value, and |Z| was recorded. 0.01Hz The evolution curves of the value and log(τ / s) with corrosion time.

[0055] Depend on Figure 4 The results show that when the corrosive system is in a glove box and kept open, the measured |Z| is [value missing] during the initial stage of corrosion. 0.01Hz The values ​​of the log(τ / s) and log(τ / s) lie in log(τ / s) - |Z| 0.01Hz The second quadrant of the coordinate system, but with the extension of corrosion time and the gradual accumulation of corrosion products on the surface of the Q345R low carbon steel electrode, the measured |Z| 0.01Hz The values ​​of |Z| and log(τ / s) gradually increase and show a trend of stabilization, indicating that the candidate material Q345R low-carbon steel is in the low-oxygen corrosion stage; however, when the corrosion system is removed from the glove box and exposed to the indoor atmospheric environment, the measured |Z|0.01Hz The value and the log(τ / s) value rapidly shift towards log(τ / s) - |Z| 0.01Hz After moving to the third quadrant of the coordinate system, as corrosion products gradually accumulate on the surface of the Q345R low-carbon steel electrode, the value of log(τ / s) shows an increasing trend, which corresponds to the fact that the dissolved oxygen content in the corrosion system is sufficient at this time, and the candidate material is in the oxygen corrosion stage.

[0056] As can be seen, the results of this embodiment show that the rapid evaluation method for material corrosion rate and influencing factors in high-level radioactive waste geological disposal environment of the present invention is applicable to the rapid evaluation of oxygen leakage accidents in high-level radioactive waste geological disposal environment.

[0057] The results of the embodiments show that the rapid evaluation method for material corrosion rate and influencing factors in high-level radioactive waste geological disposal environments provided by the present invention is applicable to the rapid evaluation and identification of material corrosion rate evolution and oxygen leakage accidents in disposal reservoirs in high-level radioactive waste geological disposal environments. It is evident that the rapid evaluation method for material corrosion rate and influencing factors in high-level radioactive waste geological disposal environments of the present invention has the characteristics of simple steps, clear principles, high identification accuracy, and is also simple in method, readily available parameters, and strong operability.

[0058] The above-described embodiments are merely one implementation of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. Any modifications, substitutions, or improvements made within the spirit and principles of the present invention are within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A method for rapid evaluation of material corrosion rate and influencing factors in a high-level waste geological disposal environment, characterized by, Two parameters were obtained through electrochemical impedance spectroscopy (EIS) measurements and analysis of the relaxation time distribution (DRT) of the EIS data: one is the impedance modulus at 0.01 Hz, i.e., |Z|. 0.01Hz The value; the other is the time constant corresponding to the dissolved oxygen reduction reaction, i.e., log( τ / s) value; The materials used in the geological disposal environment of high-level radioactive waste, which are used to simulate the materials of geological disposal containers for high-level radioactive waste, include low-carbon steel, copper, cast iron, nickel-based alloys, and titanium alloys. The geological environment for the disposal of high-level radioactive waste includes the groundwater environment of the rock strata surrounding the disposal reservoir and the backfill material environment around the disposal container, including bentonite with different moisture contents. A corrosion system was used to simulate the closed environment characteristics of a high-level radioactive waste geological repository. The environmental parameters of the closed system varied depending on the location of the repository and the characteristics of the surrounding rock strata and groundwater. These environmental parameters included SO42-. 2- Concentration, Cl - Concentration, HCO3 - / CO3 2- Concentration, pH value, pressure, and moisture content of backfill material; The electrochemical impedance spectroscopy measurement first involves processing the candidate material into a working electrode for corrosion electrochemical testing, and then using a traditional three-electrode system or a two-electrode system to acquire EIS data from the working electrode, with the lower limit of the acquisition frequency not lower than 0.01 Hz. The |Z| 0.01Hz The value is obtained by reading the impedance modulus value corresponding to 0.01 Hz in the electrochemical impedance spectroscopy impedance modulus graph, and is used to reflect the ease with which the candidate material undergoes electrochemical polarization in the geological disposal environment of high-level radioactive waste. The log( τ The / s) value is obtained by DRT analysis of the measured electrochemical impedance spectroscopy and is used to reflect the ease with which dissolved oxygen undergoes reduction reaction in the corrosion system. It is related to the dissolved oxygen content. This method derives two indices based on electrochemical impedance spectroscopy measurements and relaxation time distribution analysis: the impedance modulus |Z| corresponding to 0.01 Hz. 0.01Hz The value and the time constant log( of the dissolved oxygen reduction reaction) τ / s) value; as the |Z| value when the material transitions from oxygen corrosion to oxygen-free corrosion. 0.01Hz Value and log( τ The threshold is / s), with log( τ / s) value evolves into the X-axis, with |Z| 0.01Hz The value evolves into the Y-axis, constructing log( τ / s)- |Z| 0.01Hz Planar coordinate system.

2. The method for rapid evaluation of material corrosion rate and influencing factors in a high-level waste geological disposal environment according to claim 1, characterized in that, When the measured |Z| 0.01Hz Value and log( τ The / s value is located in log( τ / s)-|Z| 0.01Hz The third quadrant of the plane coordinate system represents the corresponding corrosion system with sufficient dissolved oxygen content, the candidate material is in the aerobic corrosion stage, and the coverage of corrosion products on the surface of the candidate material is low. At this time, the corrosion rate of low carbon steel is > 24.5 μm / y.

3. The method for rapid evaluation of material corrosion rate and influencing factors in a high-level waste geological disposal environment according to claim 1, characterized in that, When the measured |Z| 0.01Hz Value and log( τ The / s value is located in log( τ / s)-|Z| 0.01Hz The fourth quadrant of the plane coordinate system represents the corresponding corrosion system with sufficient dissolved oxygen content. The candidate material is in the aerobic corrosion stage, but the surface of the candidate material already has a large amount of corrosion products covering it, that is, the coverage of corrosion products is high.

4. The method for rapid evaluation of material corrosion rate and influencing factors in a high-level waste geological disposal environment according to claim 1, characterized in that, When the measured |Z| 0.01Hz Value and log( τ The / s value is located in log( τ / s)-|Z| 0.01Hz The second quadrant of the plane coordinate system represents the low dissolved oxygen content in the corresponding corrosion system, indicating that the candidate material is in the low-oxygen corrosion stage, at which point the corrosion rate of low-carbon steel is < 24.5 μm / y.

5. The method for rapid evaluation of material corrosion rate and influencing factors in a high-level waste geological disposal environment according to claim 1, characterized in that, When the measured |Z| 0.01Hz Value and log( τ The / s value is located in log( τ / s)-|Z| 0.01Hz The first quadrant of the plane coordinate system represents the area where dissolved oxygen has been consumed in the corresponding corrosion system, and the candidate material has entered the oxygen-free corrosion stage.

6. The method for rapid evaluation of material corrosion rate and influencing factors in a high-level waste geological disposal environment according to claim 1, characterized in that, When the measured |Z| 0.01Hz Value and log( τ The / s value is presented from log( τ / s)-|Z| 0.01Hz The tendency of the third or fourth quadrant of the plane coordinate system to move towards the first or second quadrant indicates that the oxygen in the corrosion system is gradually consumed by the corrosion reaction, and the oxygen content in the corrosion system gradually decreases.

7. The method for rapid evaluation of material corrosion rate and influencing factors in a high-level waste geological disposal environment according to claim 1, characterized in that, When the measured |Z| 0.01Hz Value and log( τ The / s value is presented from log( τ / s)-|Z| 0.01Hz A tendency for the corrosion system to shift from the first or second quadrant to the third or fourth quadrant in a plane coordinate system indicates a leak in the corrosion system, with external oxygen entering the system.

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