Method for testing corrosion resistance of metal bipolar plate

Abstract

The invention relates to the field of fuel cells, in particular to a method for testing corrosion resistance of a metal bipolar plate. The method comprises the following steps: acquiring the initial self-corrosion current density of the metal bipolar plate; performing an off-line acceleration test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate; wherein the offline acceleration test is determined according to the actual operation condition of the metal bipolar plate; determining an acceleration coefficient of an offline acceleration test according to the initial self-corrosion current density and the real-time self-corrosion current density under the condition that the real-time self-corrosion current density is identified to meet the termination index; and determining the corrosion resistance test result of the metal bipolar plate according to the acceleration coefficient of the offline acceleration test, the offline test times and the single test duration. According to the invention, the corrosion resistance of the metal bipolar plate under the actual operation condition of the fuel cell can be evaluated more accurately.

Description

Technical Field

[0001] The present application relates to the field of fuel cells, and in particular to a method for testing the corrosion resistance of metal bipolar plates. Background Art

[0002] In recent years, metal bipolar plates have been widely used in proton exchange membrane fuel cells due to their better formability and excellent electrical and thermal conductivity. The development of metal bipolar plates includes structural design, stamping, coating and sealing. The surface of the bipolar plate will be coated with a conductive and corrosion-resistant coating to meet the requirements of fuel cell use. The material selection and preparation process of the coating will have a key impact on the overall performance, cost and service life of the bipolar plate.

[0003] The corrosion resistance of metal bipolar plate coating characterizes the corrosion resistance of metal bipolar plate. In order to evaluate the corrosion resistance of metal bipolar plate coating, most of the existing methods adopt the offline evaluation test method in the three-electrode electrochemical measurement system, add the corrosion solution simulating the operating conditions of the fuel cell, and evaluate the corrosion resistance of the coating through potentiodynamic polarization and electrostatic potential stabilization.

[0004] However, the current corrosion resistance test method for metal bipolar plates cannot accurately simulate the actual operating conditions of fuel cells, resulting in a large difference between the corrosion resistance test results of metal bipolar plates and the corrosion resistance results of the coating in the actual battery operating environment, so it is urgently needed to be improved. Summary of the invention

[0005] Based on this, it is necessary to provide a metal bipolar plate corrosion resistance testing method that can more accurately evaluate the corrosion resistance of metal bipolar plates under actual operating conditions of fuel cells in response to the above technical problems.

[0006] In a first aspect, the present application provides a method for testing the corrosion resistance of a metal bipolar plate, the method comprising:

[0007] Obtaining the initial self-corrosion current density of the metal bipolar plate;

[0008] Performing an offline accelerated test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate; wherein the offline accelerated test is determined according to the actual operating conditions of the metal bipolar plate;

[0009] When it is identified that the real-time self-corrosion current density meets the termination index, the acceleration factor of the offline accelerated test is determined according to the initial self-corrosion current density and the real-time self-corrosion current density;

[0010] The corrosion resistance test results of the metal bipolar plate are determined based on the acceleration factor of the offline accelerated test, the number of offline tests and the duration of a single test.

[0011] In one embodiment, obtaining the initial self-corrosion current density of the metal bipolar plate includes:

[0012] Conduct open circuit potential test on metal bipolar plates;

[0013] After the open circuit potential test is completed, a potentiodynamic polarization test is performed on the metal bipolar plate to obtain the initial self-corrosion current density of the metal bipolar plate.

[0014] In one embodiment, the offline accelerated test includes an aging accelerated test and / or a start-stop accelerated test, and the metal bipolar plate is subjected to an offline accelerated test to obtain a real-time self-corrosion current density of the metal bipolar plate, including:

[0015] Performing accelerated aging tests and / or start-stop accelerated tests on metal bipolar plates;

[0016] During the aging accelerated test and / or the start-stop accelerated test, a potentiodynamic polarization test is performed on the metal bipolar plate according to a preset sampling frequency to obtain the real-time self-corrosion current density of the metal bipolar plate at different times.

[0017] In one embodiment, the metal bipolar plate is subjected to an accelerated aging test, comprising:

[0018] The metal bipolar plates are tested in sequence using a variety of different aging acceleration schemes, wherein each aging acceleration scheme includes a constant voltage parameter and a scanning duration parameter.

[0019] In one embodiment, the plurality of different accelerated aging schemes include three different accelerated aging schemes;

[0020] The weight ranges of the constant voltage parameter in the three different aging acceleration schemes are: [0, 0.5V], [0, 1V] and [0, 1V]; the weight ranges of the scanning time parameter in the three different aging acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s].

[0021] In one embodiment, a start-stop acceleration test is performed on a metal bipolar plate, including:

[0022] The metal bipolar plates were tested in sequence using a variety of different start-stop acceleration schemes; each start-stop acceleration scheme included a constant voltage parameter and a scan duration parameter.

[0023] In one embodiment, the plurality of different start-stop acceleration schemes include three different start-stop acceleration schemes;

[0024] The weight ranges of the constant voltage parameters in the three different start-stop acceleration schemes are: [0, 0.5V], [0, 0.8V] and [0.5, 2V]; the weight ranges of the scanning time parameters in the three different start-stop acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s].

[0025] In one embodiment, the metal bipolar plate is subjected to an accelerated aging test and / or a start-stop accelerated test, including:

[0026] The first preset number of accelerated aging tests and / or the second preset number of accelerated start-stop tests are regarded as a single test cycle;

[0027] The metal bipolar plates are tested using at least a single test cycle.

[0028] In one embodiment, identifying that the real-time self-corrosion current density meets the termination index includes:

[0029] When it is identified that the real-time self-corrosion current density is greater than the current density threshold, it is determined that the real-time self-corrosion current density meets the termination index.

[0030] In one embodiment, determining the acceleration factor of the offline accelerated test according to the initial self-corrosion current density and the real-time self-corrosion current density includes:

[0031] The ratio between the real-time self-corrosion current density and the initial self-corrosion current density is determined as the acceleration factor of the off-line accelerated test.

[0032] In one embodiment, the corrosion resistance test result of the metal bipolar plate is determined according to the acceleration coefficient of the offline accelerated test, the number of offline tests and the duration of a single test, including:

[0033] The product of the acceleration coefficient of the offline accelerated test, the number of offline tests and the duration of a single test is determined as the corrosion resistance test result of the metal bipolar plate.

[0034] In a second aspect, the present application also provides a metal bipolar plate corrosion resistance testing device, the device comprising:

[0035] A first acquisition module is used to acquire the initial self-corrosion current density of the metal bipolar plate;

[0036] An offline test module is used to perform offline accelerated testing on metal bipolar plates to obtain the real-time self-corrosion current density of the metal bipolar plates;

[0037] An analysis module is used to determine an acceleration factor of an offline accelerated test based on an initial self-corrosion current density and a real-time self-corrosion current density when it is identified that the real-time self-corrosion current density meets a termination index;

[0038] The evaluation module is used to determine the corrosion resistance test result of the metal bipolar plate according to the acceleration factor, the number of test cycles and the single cycle duration of the offline accelerated test.

[0039] In a third aspect, the present application further provides a computer device, the computer device comprising a memory and a processor, the memory storing a computer program, and the processor implementing the following steps when executing the computer program:

[0040] Obtaining the initial self-corrosion current density of the metal bipolar plate;

[0041] Performing an offline accelerated test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate; wherein the offline accelerated test is determined according to the actual operating conditions of the metal bipolar plate;

[0042] When it is identified that the real-time self-corrosion current density meets the termination index, the acceleration factor of the offline accelerated test is determined according to the initial self-corrosion current density and the real-time self-corrosion current density;

[0043] The corrosion resistance test results of the metal bipolar plate are determined based on the acceleration factor of the offline accelerated test, the number of offline tests and the duration of a single test.

[0044] In a fourth aspect, the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0045] Obtaining the initial self-corrosion current density of the metal bipolar plate;

[0046] Performing an offline accelerated test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate; wherein the offline accelerated test is determined according to the actual operating conditions of the metal bipolar plate;

[0047] When it is identified that the real-time self-corrosion current density meets the termination index, the acceleration factor of the offline accelerated test is determined according to the initial self-corrosion current density and the real-time self-corrosion current density;

[0048] The corrosion resistance test results of the metal bipolar plate are determined based on the acceleration factor of the offline accelerated test, the number of offline tests and the duration of a single test.

[0049] In a fifth aspect, the present application further provides a computer program product, the computer program product comprising a computer program, and when the computer program is executed by a processor, the following steps are implemented:

[0050] Obtaining the initial self-corrosion current density of the metal bipolar plate;

[0051] Performing an offline accelerated test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate; wherein the offline accelerated test is determined according to the actual operating conditions of the metal bipolar plate;

[0052] When it is identified that the real-time self-corrosion current density meets the termination index, the acceleration factor of the offline accelerated test is determined according to the initial self-corrosion current density and the real-time self-corrosion current density;

[0053] The corrosion resistance test results of the metal bipolar plate are determined based on the acceleration factor of the offline accelerated test, the number of offline tests and the duration of a single test.

[0054] The above-mentioned metal bipolar plate corrosion resistance test method, the offline acceleration test in this application is generated according to the actual operating conditions of the metal bipolar plate. Therefore, by performing an offline acceleration test on the metal bipolar plate, the influence of different fuel cell operating conditions on the long-term stability of the metal bipolar plate can be truly and effectively evaluated; in addition, detecting the corrosion state of the metal bipolar plate can more truly reflect the corrosion effect of the metal bipolar plate during the operation of the fuel cell. The present application obtains the real-time self-corrosion current density and the initial self-corrosion current density, and then determines the acceleration coefficient of the offline acceleration test, and determines the corrosion resistance test result of the metal bipolar plate based on the acceleration coefficient of the offline acceleration test, the number of offline tests and the duration of a single test. The corrosion resistance test result of the metal bipolar plate is used to predict the service life of the metal bipolar plate. Compared with traditional technologies, it can more accurately predict the corrosion resistance of the metal bipolar plate in the actual operating conditions of the fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 Schematic diagram of a process for testing the corrosion resistance of a metal bipolar plate in one embodiment;

[0056] Figure 2 A schematic diagram of a process for performing an offline accelerated test on a metal bipolar plate in one embodiment;

[0057] Figure 3 A structural block diagram of a metal bipolar plate corrosion resistance testing device in one embodiment;

[0058] Figure 4 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] In recent years, metal bipolar plates have been widely used in proton exchange membrane fuel cells due to their better formability and excellent electrical and thermal conductivity. The stack assembled with metal bipolar plates has the advantages of high power density, high energy conversion rate and good vibration resistance. However, the metal bipolar plates in proton exchange membrane fuel cells (PEMFC) are prone to corrosion and have a short life, which hinders their further development. Commonly used bipolar plate substrates include stainless steel, titanium and graphite. Compared with other bipolar plate materials, stainless steel substrates are widely used because of their good ductility and low cost. The development of metal bipolar plates includes structural design, stamping, coating and sealing. The surface of the bipolar plate will be coated with a conductive and corrosion-resistant coating to meet the requirements of fuel cell use. The material selection and preparation process of the coating will have a key impact on the overall performance, cost and service life of the bipolar plate.

[0061] The operating environment of the metal bipolar plates in PEMFC is generally an acidic environment (pH ≈ 3) with a temperature of 60 to 90°C, which can easily cause corrosion reactions on the surface of the bipolar plates, resulting in pitting and crevice corrosion, which seriously affects the service life of the bipolar plates. However, the operating process in PEMFC is often more complicated, and the electrochemical offline test evaluation cannot accurately simulate the actual operating conditions of the fuel cell, such as idling and start-stop conditions, including acidic environment, high humidity and uneven temperature distribution.

[0062] The corrosion resistance of metal bipolar plate coating is characterized by the corrosion resistance of the metal bipolar plate. In order to evaluate the corrosion resistance of metal bipolar plates, most traditional test methods use an offline evaluation test method in a three-electrode electrochemical measurement system, add a corrosion solution that simulates the operating conditions of the battery stack, and evaluate the corrosion resistance of the coating by potentiodynamic polarization and electrostatic potential stabilization; however, the three-electrode system is used to measure the curve of the change of corrosion current with corrosion time under constant potential, which has great limitations. The test cycle is long and the efficiency is low. The quantification of the test area is not achieved. More importantly, the deformation caused by the stress conditions on the surface of the bipolar plate and the crevice corrosion reaction are not considered.

[0063] Therefore, the current traditional testing methods cannot effectively evaluate the corrosion resistance of metal bipolar plate coatings under simulated actual operating conditions of the fuel cell stack. Therefore, it is necessary to develop a truly effective metal bipolar plate corrosion resistance evaluation method to achieve rapid evaluation of the corrosion resistance of automotive hydrogen fuel cell bipolar plates.

[0064] Therefore, this embodiment provides a method for testing the corrosion resistance of metal bipolar plates, which is suitable for offline accelerated testing and evaluation of bipolar plates in all fuel cells. The testing method is simple and easy to operate, can more accurately reflect the operating environment of fuel cell aging and start-stop conditions, and can quickly evaluate the failure mode of fuel cell metal bipolar plates, providing direction for improving the process design and material development of fuel cell bipolar plate coatings.

[0065] Specifically, the metal bipolar plate corrosion resistance test method provided in this embodiment is applied to the metal bipolar plate life acceleration test platform, and specifically to the electrochemical workstation in the metal bipolar plate life acceleration test platform. The metal bipolar plate life acceleration test platform includes an electrochemical workstation, a corrosion electrolyte, a constant temperature water bath, an electrolytic cell, and electrodes, etc. Specifically, the metal bipolar plate sample is used as a working electrode, a platinum sheet electrode is used as a counter electrode, and a silver / silver chloride electrode (Ag / AgCl) is used as a reference electrode, and the electrochemical workstation is connected according to the standard three-electrode system and loaded into the corrosion electrolytic cell.

[0066] Among them, electrochemical workstation is the abbreviation of electrochemical measurement system. It is a commonly used measurement equipment in electrochemical research and teaching. It can measure, evaluate, and research and analyze the equilibrium properties of the electrode and the polarization properties after power is applied, that is, the electrochemical behavior at the interface between the electrode and the electrolyte.

[0067] In this embodiment, the corrosion electrolyte is PH = 1-5H2SO4 + 0.1-10ppm HF acid solution, and the corrosion temperature is 60-80°C.

[0068] Optionally, in the process of building a metal bipolar plate life acceleration test platform: first use epoxy resin to cover the back and sides of the metal bipolar plate, and the exposed area of ​​the metal bipolar plate surface is 25cm 2 ; Then use the metal bipolar plate as the working electrode, the platinum electrode as the counter electrode, and the silver / silver chloride electrode (Ag / AgCl) as the reference electrode, connect to the electrochemical workstation according to the standard three-electrode system, and load it into the corrosion electrolytic cell. Prepare a H2SO4 acid solution with a pH of 3, and add 2ppm of HF to form a mixed electrolyte to simulate the PEMFC environment, heat the electrolyte to 80°, and stabilize for 10 minutes.

[0069] In one embodiment, Figure 1 As shown, a method for testing the corrosion resistance of a metal bipolar plate is provided, which specifically comprises the following steps:

[0070] S101, obtaining the initial self-corrosion current density of the metal bipolar plate.

[0071] Optionally, a potentiodynamic polarization test is performed on the metal bipolar plate, the voltage range is set to [-0.75V-+1.6V], the scanning rate is 2mV / s, and after the test, the TAFER curve is fitted to obtain the self-corrosion current density, which is recorded as the initial self-corrosion current density I0.

[0072] It can be understood that the potentiodynamic polarization method is an electrochemical kinetics research method, which applies a certain potential to the electrode surface and observes the potential change on the electrode surface to detect the electrochemical reaction process on the electrode surface. The basic principle of the potentiodynamic polarization method is dynamic potential polarization, that is, applying a sufficiently large potential on the electrode surface to make the potential on the electrode surface change rapidly, thereby causing the electrochemical reaction on the electrode surface to change; the potentiodynamic polarization method can be used to study the corrosion behavior of metal materials, such as corrosion rate, corrosion mechanism, corrosion products, etc.

[0073] S102, performing an offline accelerated test on the metal bipolar plate to obtain a real-time self-corrosion current density of the metal bipolar plate.

[0074] Among them, the offline acceleration test is determined according to the actual operating conditions of the metal bipolar plate, and is a simulated operating condition used to simulate the actual operating conditions of the metal bipolar plate.

[0075] It is understandable that the working conditions of PEMFC are complex. In actual vehicle applications, fuel cells mainly experience four working conditions: start-stop condition, idling condition, high load condition and variable load condition. "Offline" in this embodiment refers to testing the metal bipolar plate in non-actual operation, and "acceleration" in this embodiment refers to setting parameters in the test process, accelerating the actual working conditions of the fuel cell to generate simulated conditions, and testing the metal bipolar plate under the simulated conditions, so that the metal bipolar plate undergoes accelerated changes (i.e., accelerated corrosion) compared to the actual use process.

[0076] Specifically, performing an offline accelerated test on a metal bipolar plate refers to performing N times (N is a positive integer and greater than or equal to 1) of offline accelerated tests on the metal bipolar plate.

[0077] Optionally, during the off-line accelerated test of the metal bipolar plate, a potentiodynamic polarization test is performed on the metal bipolar plate to obtain the real-time self-corrosion current density I of the metal bipolar plate. n It is understandable that the metal bipolar plate can be subjected to a potentiodynamic polarization test at a preset sampling frequency to obtain the real-time self-corrosion current density of the metal bipolar plate at multiple different times.

[0078] S103, when it is identified that the real-time self-corrosion current density meets the termination index, an acceleration coefficient of the offline acceleration test is determined according to the initial self-corrosion current density and the real-time self-corrosion current density.

[0079] Among them, the termination index is used to indicate whether the metal bipolar plate can continue to be tested for durability, and the termination index can be set according to the empirical value. If the real-time self-corrosion current density reaches the termination index, it indicates that the metal bipolar plate can no longer be tested for durability (reaching the corresponding service life); if the real-time self-corrosion current density does not reach the termination index, it indicates that the metal bipolar plate can continue to be tested for durability (not reaching the corresponding service life).

[0080] Optionally, if it is identified that the real-time self-corrosion current density meets the termination index, it means that the corrosion resistance of the metal bipolar plate has reached the corresponding service life. At this time, the acceleration coefficient of the offline accelerated test is determined according to the initial self-corrosion current density and the real-time self-corrosion current density, and the offline accelerated test is stopped.

[0081] It can be understood that the acceleration factor of the offline acceleration test is the above-mentioned “acceleration” which refers to the acceleration multiple α of the simulated operating condition compared to the actual operating condition of the fuel cell by setting the parameters during the test.

[0082] Specifically, the acceleration coefficient α of the off-line accelerated test can be determined according to the proportional relationship between the initial self-corrosion current density and the real-time self-corrosion current density.

[0083] S104, determining the corrosion resistance test result of the metal bipolar plate according to the acceleration coefficient of the offline accelerated test, the number of offline tests and the duration of a single test.

[0084] The number of offline tests is the above N; the duration of a single test is the time T corresponding to a single offline acceleration test.

[0085] Optionally, the corrosion resistance test result (service life) of the metal bipolar plate under simulated conditions can be determined according to the number of offline tests and the duration of a single test, and then the corrosion resistance test result (service life) of the metal bipolar plate under actual operating conditions can be determined. Exemplarily, if under simulated conditions, the service life of the metal bipolar plate under simulated operating conditions is t0, then the service life of the metal bipolar plate under actual operating conditions is α*t0.

[0086] In the above-mentioned metal bipolar plate corrosion resistance test method, the offline accelerated test in this application is generated according to the actual operating conditions of the metal bipolar plate. Therefore, by performing an offline accelerated test on the metal bipolar plate, the influence of different fuel cell operating conditions on the long-term stability of the metal bipolar plate can be truly and effectively evaluated; in addition, detecting the corrosion state of the metal bipolar plate can more truly reflect the corrosion effect of the metal bipolar plate during the operation of the fuel cell. This application obtains the real-time self-corrosion current density and the initial self-corrosion current density, and then determines the acceleration coefficient of the offline accelerated test, and determines the corrosion resistance test results of the metal bipolar plate based on the acceleration coefficient of the offline accelerated test, the number of offline tests and the duration of a single test. The corrosion resistance test results of the metal bipolar plate are used to predict the service life of the metal bipolar plate. Compared with traditional technologies, it can more accurately predict the corrosion resistance of the metal bipolar plate in the actual operating conditions of the fuel cell.

[0087] In one embodiment, this embodiment provides an optional method for obtaining the initial self-corrosion current density of the metal bipolar plate, that is, it provides a method for refining S101. The specific implementation process may include: performing an open circuit potential test on the metal bipolar plate; after the open circuit potential test is completed, performing a dynamic potential polarization test on the metal bipolar plate to obtain the initial self-corrosion current density of the metal bipolar plate.

[0088] Optionally, in the present embodiment, the electrochemical workstation selects an open circuit potential test module, stabilizes for 30-60 minutes, and then performs a potentiodynamic polarization test on the metal bipolar plate.

[0089] In this embodiment, the initial self-corrosion current density I0 of the metal bipolar plate can be accurately obtained through open circuit potential testing and potentiodynamic polarization testing.

[0090] like Figure 2 As shown, the offline accelerated test includes an aging accelerated test and / or a start-stop accelerated test; this embodiment provides an optional method for performing an offline accelerated test on a metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate, that is, provides a method for refining S102. The specific implementation process may include:

[0091] S201, performing an accelerated aging test and / or a start-stop accelerated test on the metal bipolar plate.

[0092] S202, during the aging acceleration test and / or the start-stop acceleration test, a potentiodynamic polarization test is performed on the metal bipolar plate according to a preset sampling frequency to obtain the real-time self-corrosion current density of the metal bipolar plate at different times.

[0093] Among them, the accelerated aging test and / or start-stop accelerated test of the metal bipolar plate can include the following three situations:

[0094] Case 1): Only the metal bipolar plate is subjected to accelerated aging test, including: using a variety of different accelerated aging schemes to test the metal bipolar plates in turn.

[0095] Each aging acceleration scheme includes a constant voltage parameter and a scanning time parameter.

[0096] Specifically, the multiple different aging acceleration schemes include three different aging acceleration schemes; the weight ranges of the constant voltage parameters in the three different aging acceleration schemes are: [0, 0.5V], [0, 1V] and [0, 1V] respectively; the weight ranges of the scanning time parameters in the three different aging acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s] respectively.

[0097] For example, in the accelerated aging test, the first stage of the accelerated aging scheme is set to: constant potential E = 0-0.5V, scanning time 10-60s; the second stage of the accelerated aging scheme is set to: constant potential E = 0-1V, scanning time 0-60s; the third stage of the accelerated aging scheme is set to: constant potential E = 0-1V, scanning time 0-60s. And the initial potential of the accelerated aging test is set to 0-0.5V.

[0098] In this embodiment, the number of cycles of the aging acceleration test is 0-10000 times (i.e., N=0-10000 above), the sampling interval is 0-10s (corresponding to the preset sampling frequency), or, the aging acceleration test is performed once every 50-5000 cycles (corresponding to the preset sampling frequency), and the real-time self-corrosion current density is I n ; The time used for each accelerated aging test is recorded as t1, that is, the duration of the above single test is the time T=t1 corresponding to a single offline accelerated test.

[0099] Furthermore, the number of cycles N can also be converted into test time, for example, the test time is 10 hours, 20 hours, and 50 hours.

[0100] Case 2): Only the metal bipolar plate is subjected to start-stop acceleration test, including: using a variety of different start-stop acceleration schemes to test the metal bipolar plates in turn.

[0101] Each start-stop acceleration scheme includes a constant voltage parameter and a scanning time parameter.

[0102] Specifically, the multiple different start-stop acceleration schemes include three different start-stop acceleration schemes; the weight ranges of the constant voltage parameters in the three different start-stop acceleration schemes are: [0, 0.5V], [0, 0.8V] and [0.5, 2V] respectively; the weight ranges of the scanning time parameters in the three different start-stop acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s] respectively.

[0103] For example, in the start-stop acceleration test, the start-stop acceleration scheme of the first stage is set as: constant potential E = 0-0.5V, scanning time 10-60s; the start-stop acceleration scheme of the second stage is set as: constant potential E = 0-0.8V, scanning time 0-60s; the start-stop acceleration scheme of the third stage is set as: constant potential E = 0.5-2V, scanning time 0-60s. And the initial potential of the start-stop acceleration test is set to 0-0.5V.

[0104] Furthermore, the number of cycles of the start-stop acceleration test is 0-10000 times (i.e., N=0-10000 above), the sampling interval is 0-10s (corresponding to the preset sampling frequency), or, a dynamic potential polarization test is performed after every 50-5000 cycles of the start-stop acceleration test (corresponding to the preset sampling frequency); the time used for each start-stop acceleration test is recorded as t2, that is, the above single test duration is the time T=t2 corresponding to a single offline acceleration test.

[0105] If it is necessary to consider the simulation test of the shutdown state in the fuel cell, a fourth stage acceleration scheme can be added, and the specific parameters are: constant potential E=0V, scanning time 1-10min.

[0106] Case 3): Performing accelerated aging test and start-stop accelerated test on the metal bipolar plate, including: treating a first preset number of accelerated aging tests and a second preset number of start-stop accelerated tests as a single test cycle; and using at least one single test cycle to test the metal bipolar plate.

[0107] Specifically, if it is necessary to perform idle and start-stop simulation tests on the fuel cell bipolar plate coating at the same time, the corrosion resistance test method of the present invention can simultaneously perform accelerated aging tests and start-stop accelerated tests, and the test is performed according to 1-10 times (corresponding to the first preset number n1) of accelerated aging tests and 1-3 times (corresponding to the second preset number n2) of start-stop accelerated tests as a cycle (i.e., a single test cycle); accordingly, the time used for each accelerated aging test is recorded as t1, that is, the above-mentioned single test duration is the time T corresponding to a single offline accelerated test = n1*t1+n2*t2.

[0108] In this embodiment, according to the actual operating characteristics of the stack system potential, two new offline accelerated testing methods for coatings are developed: an accelerated aging test and a start-stop accelerated test; by changing the potential and the operating time during the accelerated test to simulate the potential changes during the stack operation, and measuring the corrosion current curve over time, the coating performance can be evaluated quickly and effectively; the offline test provided in this embodiment takes into account the corrosion reaction process of the bipolar plate coating more comprehensively, saves the testing time of the corrosion resistance of the bipolar plate, significantly improves the evaluation efficiency of the corrosion resistance of the metal bipolar plate coating, and can meet the needs of engineering applications.

[0109] In one embodiment, the acceleration factor of the offline accelerated test is determined according to the initial self-corrosion current density and the real-time self-corrosion current density, including:

[0110] When it is identified that the real-time self-corrosion current density is greater than the current density threshold, it is determined that the real-time self-corrosion current density meets the termination index.

[0111] Optionally, the current density threshold in this embodiment may be: 1E-6A / cm 2 .

[0112] In one embodiment, identifying that the real-time self-corrosion current density meets the termination index includes: determining the ratio between the real-time self-corrosion current density and the initial self-corrosion current density as the acceleration coefficient of the offline acceleration test.

[0113] It can be understood that the relationship between the test time and the change in corrosion current density can be plotted to evaluate the life of the metal bipolar plate, and the acceleration factor α is related to the length of the time period.

[0114] Optionally, the acceleration coefficient α in this embodiment is n / I0; where I n is the real-time self-corrosion current density when it is greater than the current density threshold.

[0115] Exemplarily, the metal bipolar plate is subjected to 10,000 aging and start-stop acceleration tests, and the durability performance is determined by comparing the corrosion current density decay ratio of the metal bipolar plate in the potentiodynamic polarization test. The service life of the metal bipolar plate coating is predicted based on the test time required for the metal bipolar plate coating to reach the end of its life in the offline accelerated test.

[0116] In one embodiment, the corrosion resistance test result of the metal bipolar plate is determined according to the acceleration coefficient of the offline accelerated test, the number of offline tests and the duration of a single test, including: the product of the acceleration coefficient of the offline accelerated test, the number of offline tests and the duration of a single test is determined as the corrosion resistance test result of the metal bipolar plate.

[0117] Among them, the corrosion resistance test result of the metal bipolar plate is the service life of the metal bipolar plate under actual operating conditions, and the service life = acceleration coefficient α*N*T.

[0118] Furthermore, the reliability of the offline accelerated testing method for metal bipolar plates can be evaluated by combining parameters such as the change in corrosion current density, contact resistance, and coating discoloration / film peeling area with potentiodynamic polarization testing.

[0119] Illustratively, this embodiment provides a specific implementation of a method for testing the corrosion resistance of a metal bipolar plate, and the test results are shown in Table 1 below:

[0120] Table 1

[0121]

[0122]

[0123] When predicting the life of metal bipolar plates under accelerated aging tests: When the corrosion current density of the potentiodynamic polarization test reaches 1E-6A / cm 2 When the acceleration factor α is 1.75, the estimated service life α*N*T is more than 8000h. When the metal bipolar plate life prediction is performed under the start-stop acceleration test: when the corrosion current density of the dynamic potential polarization test reaches 1E-6A / cm 2 When the acceleration factor α is 2.2, the estimated service life α*N*T is more than 5000h. After the aging accelerated test and the start-stop accelerated test, obvious corrosion marks have appeared on the coating surface, which is similar to the corrosion pit area of ​​the bipolar plate surface coating after the actual operation of the battery stack for 5500h; and the corrosion current density of the dynamic potential polarization test increases, indicating that the durability of the coating is rapidly declining.

[0124] In this embodiment, by changing the potential and running time of the test process to perform accelerated simulation tests, and continuously performing periodic cycle tests of idling and start-stop conditions, the impact of different fuel cell operating conditions on the long-term stability of the metal bipolar plate can be truly and effectively evaluated. The evaluation method of the present invention has high timeliness, can greatly reduce the cost and cycle of in-situ testing, and provides an important technical basis for the material selection and process development of metal bipolar plate coatings in the early stages of research and development.

[0125] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0126] Based on the same inventive concept, the embodiment of the present application also provides a metal bipolar plate corrosion resistance testing device for implementing the metal bipolar plate corrosion resistance testing method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more metal bipolar plate corrosion resistance testing device embodiments provided below can refer to the limitations of the metal bipolar plate corrosion resistance testing method above, and will not be repeated here.

[0127] In one embodiment, Figure 3 As shown, a metal bipolar plate corrosion resistance testing device 1 is provided, comprising: a first acquisition module 11, an offline testing module 12, an analysis module 13 and an evaluation module 14, wherein:

[0128] A first acquisition module 11 is used to acquire the initial self-corrosion current density of the metal bipolar plate;

[0129] An offline test module 12 is used to perform an offline accelerated test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate, wherein the offline accelerated test is determined according to the actual operating conditions of the metal bipolar plate;

[0130] The analysis module 13 is used to determine the acceleration factor of the offline acceleration test according to the initial self-corrosion current density and the real-time self-corrosion current density when it is identified that the real-time self-corrosion current density meets the termination index;

[0131] The evaluation module 14 is used to determine the corrosion resistance test result of the metal bipolar plate according to the acceleration coefficient, the number of test cycles and the duration of a single cycle of the offline accelerated test.

[0132] In one embodiment, the first acquisition module 11 is further used to: perform an open circuit potential test on the metal bipolar plate;

[0133] After the open circuit potential test is completed, a potentiodynamic polarization test is performed on the metal bipolar plate to obtain the initial self-corrosion current density of the metal bipolar plate.

[0134] In one embodiment, the offline accelerated test includes an aging accelerated test and / or a start-stop accelerated test; the offline test module 12 is further used to: perform an aging accelerated test and / or a start-stop accelerated test on the metal bipolar plate;

[0135] During the aging accelerated test and / or the start-stop accelerated test, a potentiodynamic polarization test is performed on the metal bipolar plate according to a preset sampling frequency to obtain the real-time self-corrosion current density of the metal bipolar plate at different times.

[0136] In one embodiment, the offline testing module 12 is further used to: adopt a plurality of different aging acceleration schemes to test the metal bipolar plate in sequence; wherein each aging acceleration scheme includes a constant voltage parameter and a scanning time parameter.

[0137] In one embodiment, the plurality of different accelerated aging schemes include three different accelerated aging schemes;

[0138] The weight ranges of the constant voltage parameter in the three different aging acceleration schemes are: [0, 0.5V], [0, 1V] and [0, 1V]; the weight ranges of the scanning time parameter in the three different aging acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s].

[0139] In one embodiment, the offline test module 12 is further used to: adopt a plurality of different start-stop acceleration schemes to test the metal bipolar plate in sequence; wherein each start-stop acceleration scheme includes a constant voltage parameter and a scanning duration parameter.

[0140] In one embodiment, the plurality of different start-stop acceleration schemes include three different start-stop acceleration schemes;

[0141] The weight ranges of the constant voltage parameters in the three different start-stop acceleration schemes are: [0, 0.5V], [0, 0.8V] and [0.5, 2V]; the weight ranges of the scanning time parameters in the three different start-stop acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s].

[0142] In one embodiment, the offline test module 12 is further used to: treat the first preset number of accelerated aging tests and / or the second preset number of accelerated start-stop tests as a single test cycle;

[0143] The metal bipolar plates are tested using at least a single test cycle.

[0144] In one embodiment, the analysis module 13 is further used to: when it is identified that the real-time self-corrosion current density is greater than the current density threshold, determine that the real-time self-corrosion current density meets the termination index.

[0145] In one embodiment, the analysis module 13 is further used to determine the ratio between the real-time self-corrosion current density and the initial self-corrosion current density as the acceleration coefficient of the offline acceleration test.

[0146] In one embodiment, the evaluation module 14 is further used to determine the product of the acceleration coefficient of the offline accelerated test, the number of offline tests and the duration of a single test as the corrosion resistance test result of the metal bipolar plate.

[0147] Each module in the above-mentioned metal bipolar plate corrosion resistance testing device 1 can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0148] In one embodiment, a computer device is provided, which may be a server (a server in an electrochemical workstation), and its internal structure diagram may be as follows: Figure 4 As shown. The computer device includes a processor, a memory and a network interface connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data of a metal bipolar plate corrosion resistance test method. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a metal bipolar plate corrosion resistance test method is implemented.

[0149] Those skilled in the art will understand that Figure 4 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0150] In one embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0151] Obtaining the initial self-corrosion current density of the metal bipolar plate;

[0152] Performing an offline accelerated test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate; wherein the offline accelerated test is determined according to the actual operating conditions of the metal bipolar plate;

[0153] When it is identified that the real-time self-corrosion current density meets the termination index, the acceleration factor of the offline accelerated test is determined according to the initial self-corrosion current density and the real-time self-corrosion current density;

[0154] The corrosion resistance test results of the metal bipolar plate are determined based on the acceleration factor of the offline accelerated test, the number of offline tests and the duration of a single test.

[0155] In one embodiment, when the processor executes the logic of the computer program to obtain the initial self-corrosion current density of the metal bipolar plate, the following steps are specifically implemented: performing an open circuit potential test on the metal bipolar plate; after the open circuit potential test is completed, performing a dynamic potential polarization test on the metal bipolar plate to obtain the initial self-corrosion current density of the metal bipolar plate.

[0156] In one embodiment, the offline accelerated test includes an aging accelerated test and / or a start-stop accelerated test; when the processor executes a computer program to perform an offline accelerated test on the metal bipolar plate to obtain the logic of the real-time self-corrosion current density of the metal bipolar plate, the following steps are specifically implemented: performing an aging accelerated test and / or a start-stop accelerated test on the metal bipolar plate; during the aging accelerated test and / or the start-stop accelerated test, according to a preset sampling frequency, performing a dynamic potential polarization test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate at different times.

[0157] In one embodiment, when the processor executes the logic of the computer program to perform accelerated aging testing on the metal bipolar plate, the following steps are specifically implemented: using multiple different aging acceleration schemes to test the metal bipolar plate in turn; wherein each aging acceleration scheme includes a constant voltage parameter and a scanning duration parameter.

[0158] In one embodiment, the multiple different aging acceleration schemes include three different aging acceleration schemes; the weight ranges of the constant voltage parameters in the three different aging acceleration schemes are: [0, 0.5V], [0, 1V] and [0, 1V] respectively; the weight ranges of the scanning time parameters in the three different aging acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s] respectively.

[0159] In one embodiment, when the processor executes the logic of the computer program to perform start-stop acceleration testing on the metal bipolar plate, the following steps are specifically implemented: using a variety of different start-stop acceleration schemes to test the metal bipolar plate in turn; wherein each start-stop acceleration scheme includes a constant voltage parameter and a scanning duration parameter.

[0160] In one embodiment, the multiple different start-stop acceleration schemes include three different start-stop acceleration schemes; the weight ranges of the constant voltage parameters in the three different start-stop acceleration schemes are: [0, 0.5V], [0, 0.8V] and [0.5, 2V] respectively; the weight ranges of the scanning time parameters in the three different start-stop acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s] respectively.

[0161] In one embodiment, when the processor executes the logic of the computer program to perform an accelerated aging test and / or a start-stop accelerated test on the metal bipolar plate, the following steps are specifically implemented: treating a first preset number of accelerated aging tests and / or a second preset number of start-stop accelerated tests as a single test cycle; and using at least one single test cycle to test the metal bipolar plate.

[0162] In one embodiment, when the processor executes a computer program to identify that the real-time self-corrosion current density meets the logic of the termination index, the following steps are specifically implemented: when it is identified that the real-time self-corrosion current density is greater than the current density threshold, it is determined that the real-time self-corrosion current density meets the termination index.

[0163] In one embodiment, when the processor executes a computer program to execute the logic of determining the acceleration coefficient of the offline accelerated test based on the initial self-corrosion current density and the real-time self-corrosion current density, the following steps are specifically implemented: the ratio between the real-time self-corrosion current density and the initial self-corrosion current density is determined as the acceleration coefficient of the offline accelerated test.

[0164] In one embodiment, when the processor executes a computer program to execute the logic of determining the corrosion resistance test result of the metal bipolar plate based on the acceleration coefficient of the offline acceleration test, the number of offline tests and the duration of a single test, the following steps are specifically implemented: the product of the acceleration coefficient of the offline acceleration test, the number of offline tests and the duration of a single test is determined as the corrosion resistance test result of the metal bipolar plate.

[0165] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0166] Obtaining the initial self-corrosion current density of the metal bipolar plate;

[0167] Performing an offline accelerated test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate; wherein the offline accelerated test is determined according to the actual operating conditions of the metal bipolar plate;

[0168] When it is identified that the real-time self-corrosion current density meets the termination index, the acceleration factor of the offline accelerated test is determined according to the initial self-corrosion current density and the real-time self-corrosion current density;

[0169] The corrosion resistance test results of the metal bipolar plate are determined based on the acceleration factor of the offline accelerated test, the number of offline tests and the duration of a single test.

[0170] In one embodiment, when the logic of the computer program for obtaining the initial self-corrosion current density of the metal bipolar plate is executed by the processor, the following steps are specifically implemented: performing an open circuit potential test on the metal bipolar plate; after the open circuit potential test is completed, performing a potentiodynamic polarization test on the metal bipolar plate to obtain the initial self-corrosion current density of the metal bipolar plate.

[0171] In one embodiment, the offline accelerated test includes an aging accelerated test and / or a start-stop accelerated test; when the logic of a computer program performing an offline accelerated test on a metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate is executed by a processor, the following steps are specifically implemented: performing an aging accelerated test and / or a start-stop accelerated test on the metal bipolar plate; during the aging accelerated test and / or the start-stop accelerated test, performing a dynamic potential polarization test on the metal bipolar plate according to a preset sampling frequency to obtain the real-time self-corrosion current density of the metal bipolar plate at different times.

[0172] In one embodiment, when the logic of the computer program for performing accelerated aging testing on metal bipolar plates is executed by a processor, the following steps are specifically implemented: using multiple different aging acceleration schemes to test the metal bipolar plates in sequence; wherein each aging acceleration scheme includes a constant voltage parameter and a scanning duration parameter.

[0173] In one embodiment, the multiple different aging acceleration schemes include three different aging acceleration schemes; the weight ranges of the constant voltage parameters in the three different aging acceleration schemes are: [0, 0.5V], [0, 1V] and [0, 1V] respectively; the weight ranges of the scanning time parameters in the three different aging acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s] respectively.

[0174] In one embodiment, when the logic of the computer program for performing start-stop acceleration testing on the metal bipolar plate is executed by the processor, the following steps are specifically implemented: using a variety of different start-stop acceleration schemes to test the metal bipolar plate in turn; wherein each start-stop acceleration scheme includes a constant voltage parameter and a scanning duration parameter.

[0175] In one embodiment, the multiple different start-stop acceleration schemes include three different start-stop acceleration schemes; the weight ranges of the constant voltage parameters in the three different start-stop acceleration schemes are: [0, 0.5V], [0, 0.8V] and [0.5, 2V] respectively; the weight ranges of the scanning time parameters in the three different start-stop acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s] respectively.

[0176] In one embodiment, when the logic of the computer program for performing an accelerated aging test and / or a start-stop accelerated test on a metal bipolar plate is executed by a processor, the following steps are specifically implemented: treating a first preset number of accelerated aging tests and / or a second preset number of start-stop accelerated tests as a single test cycle; and using at least one single test cycle to test the metal bipolar plate.

[0177] In one embodiment, when the computer program recognizes that the real-time self-corrosion current density meets the termination index and the logic is executed by the processor, the following steps are specifically implemented: when it is recognized that the real-time self-corrosion current density is greater than the current density threshold, it is determined that the real-time self-corrosion current density meets the termination index.

[0178] In one embodiment, when the logic of the computer program for determining the acceleration coefficient of the offline accelerated test based on the initial self-corrosion current density and the real-time self-corrosion current density is executed by the processor, the following steps are specifically implemented: the ratio between the real-time self-corrosion current density and the initial self-corrosion current density is determined as the acceleration coefficient of the offline accelerated test.

[0179] In one embodiment, when the logic of a computer program that determines the corrosion resistance test result of a metal bipolar plate based on the acceleration coefficient of an offline accelerated test, the number of offline tests, and the duration of a single test is executed by a processor, the following steps are specifically implemented: the product of the acceleration coefficient of an offline accelerated test, the number of offline tests, and the duration of a single test is determined as the corrosion resistance test result of the metal bipolar plate.

[0180] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0181] Obtaining the initial self-corrosion current density of the metal bipolar plate;

[0182] Performing an offline accelerated test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate; wherein the offline accelerated test is determined according to the actual operating conditions of the metal bipolar plate;

[0183] When it is identified that the real-time self-corrosion current density meets the termination index, the acceleration factor of the offline accelerated test is determined according to the initial self-corrosion current density and the real-time self-corrosion current density;

[0184] The corrosion resistance test results of the metal bipolar plate are determined based on the acceleration factor of the offline accelerated test, the number of offline tests and the duration of a single test.

[0185] In one embodiment, when the logic of the computer program for obtaining the initial self-corrosion current density of the metal bipolar plate is executed by the processor, the following steps are specifically implemented: performing an open circuit potential test on the metal bipolar plate; after the open circuit potential test is completed, performing a potentiodynamic polarization test on the metal bipolar plate to obtain the initial self-corrosion current density of the metal bipolar plate.

[0186] In one embodiment, the offline accelerated test includes an aging accelerated test and / or a start-stop accelerated test; when the logic of a computer program performing an offline accelerated test on a metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate is executed by a processor, the following steps are specifically implemented: performing an aging accelerated test and / or a start-stop accelerated test on the metal bipolar plate; during the aging accelerated test and / or the start-stop accelerated test, performing a dynamic potential polarization test on the metal bipolar plate according to a preset sampling frequency to obtain the real-time self-corrosion current density of the metal bipolar plate at different times.

[0187] In one embodiment, when the logic of the computer program for performing accelerated aging testing on metal bipolar plates is executed by a processor, the following steps are specifically implemented: using multiple different aging acceleration schemes to test the metal bipolar plates in sequence; wherein each aging acceleration scheme includes a constant voltage parameter and a scanning duration parameter.

[0188] In one embodiment, the multiple different aging acceleration schemes include three different aging acceleration schemes; the weight ranges of the constant voltage parameters in the three different aging acceleration schemes are: [0, 0.5V], [0, 1V] and [0, 1V] respectively; the weight ranges of the scanning time parameters in the three different aging acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s] respectively.

[0189] In one embodiment, when the logic of the computer program for performing start-stop acceleration testing on the metal bipolar plate is executed by the processor, the following steps are specifically implemented: using a variety of different start-stop acceleration schemes to test the metal bipolar plate in turn; wherein each start-stop acceleration scheme includes a constant voltage parameter and a scanning duration parameter.

[0190] In one embodiment, the multiple different start-stop acceleration schemes include three different start-stop acceleration schemes; the weight ranges of the constant voltage parameters in the three different start-stop acceleration schemes are: [0, 0.5V], [0, 0.8V] and [0.5, 2V] respectively; the weight ranges of the scanning time parameters in the three different start-stop acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s] respectively.

[0191] In one embodiment, when the logic of the computer program for performing an accelerated aging test and / or a start-stop accelerated test on a metal bipolar plate is executed by a processor, the following steps are specifically implemented: treating a first preset number of accelerated aging tests and / or a second preset number of start-stop accelerated tests as a single test cycle; and using at least one single test cycle to test the metal bipolar plate.

[0192] In one embodiment, when the computer program recognizes that the real-time self-corrosion current density meets the termination index and the logic is executed by the processor, the following steps are specifically implemented: when it is recognized that the real-time self-corrosion current density is greater than the current density threshold, it is determined that the real-time self-corrosion current density meets the termination index.

[0193] In one embodiment, when the logic of the computer program for determining the acceleration coefficient of the offline accelerated test based on the initial self-corrosion current density and the real-time self-corrosion current density is executed by the processor, the following steps are specifically implemented: the ratio between the real-time self-corrosion current density and the initial self-corrosion current density is determined as the acceleration coefficient of the offline accelerated test.

[0194] In one embodiment, when the logic of a computer program that determines the corrosion resistance test result of a metal bipolar plate based on the acceleration coefficient of an offline accelerated test, the number of offline tests, and the duration of a single test is executed by a processor, the following steps are specifically implemented: the product of the acceleration coefficient of an offline accelerated test, the number of offline tests, and the duration of a single test is determined as the corrosion resistance test result of the metal bipolar plate.

[0195] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0196] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0197] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for testing the corrosion resistance of a metal bipolar plate, characterized in that: The method comprises: Obtaining the initial self-corrosion current density of the metal bipolar plate; Performing an offline accelerated test on the metal bipolar plate to obtain a real-time self-corrosion current density of the metal bipolar plate; wherein the offline accelerated test is determined according to the actual operating conditions of the metal bipolar plate; When it is identified that the real-time self-corrosion current density meets the termination index, determining the acceleration factor of the offline accelerated test according to the initial self-corrosion current density and the real-time self-corrosion current density; The corrosion resistance test result of the metal bipolar plate is determined according to the acceleration coefficient of the offline accelerated test, the number of offline tests and the duration of a single test.

2. The method according to claim 1, characterized in that: The obtaining of the initial self-corrosion current density of the metal bipolar plate comprises: Conduct open circuit potential test on metal bipolar plates; After the open circuit potential test is completed, a potentiodynamic polarization test is performed on the metal bipolar plate to obtain the initial self-corrosion current density of the metal bipolar plate.

3. The method according to claim 1, characterized in that The offline accelerated test includes an aging accelerated test and / or a start-stop accelerated test; the offline accelerated test on the metal bipolar plate to obtain the real-time self-corrosion current density of the metal bipolar plate includes: Performing the accelerated aging test and / or the start-stop accelerated test on the metal bipolar plate; During the aging accelerated test and / or the start-stop accelerated test, a potentiodynamic polarization test is performed on the metal bipolar plate according to a preset sampling frequency to obtain the real-time self-corrosion current density of the metal bipolar plate at different times.

4. The method according to claim 3, characterized in that: The metal bipolar plate is subjected to an accelerated aging test, comprising: The metal bipolar plate is tested in sequence using a variety of different aging acceleration schemes, wherein each aging acceleration scheme includes a constant voltage parameter and a scanning duration parameter.

5. The method according to claim 4, characterized in that The multiple different aging acceleration schemes include three different aging acceleration schemes; The weight ranges of the constant voltage parameters in the three different aging acceleration schemes are: [0, 0.5V], [0, 1V] and [0, 1V] respectively; the weight ranges of the scanning time parameters in the three different aging acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s] respectively.

6. The method according to claim 3, characterized in that The metal bipolar plate is subjected to a start-stop acceleration test, including: The metal bipolar plate is tested in sequence using a variety of different start-stop acceleration schemes, wherein each start-stop acceleration scheme includes a constant voltage parameter and a scanning duration parameter.

7. The method according to claim 6, characterized in that The multiple different start-stop acceleration schemes include three different start-stop acceleration schemes; The weight ranges of the constant voltage parameters in the three different start-stop acceleration schemes are: [0, 0.5V], [0, 0.8V] and [0.5, 2V] respectively; the weight ranges of the scanning time parameters in the three different start-stop acceleration schemes are: [10s, 60s], [0s, 60s] and [0s, 60s] respectively.

8. The method according to claim 3, characterized in that The performing the accelerated aging test and / or the start-stop accelerated test on the metal bipolar plate includes: The first preset number of accelerated aging tests and / or the second preset number of accelerated start-stop tests are regarded as a single test cycle; The metal bipolar plate is tested using at least one single test cycle.

9. The method according to any one of claims 1 to 8, characterized in that: The step of determining the acceleration factor of the offline accelerated test according to the initial self-corrosion current density and the real-time self-corrosion current density comprises: The ratio between the real-time self-corrosion current density and the initial self-corrosion current density is determined as the acceleration coefficient of the off-line accelerated test.

10. The method according to any one of claims 1 to 8, characterized in that: Determining the corrosion resistance test result of the metal bipolar plate according to the acceleration coefficient of the offline accelerated test, the number of offline tests and the duration of a single test, includes: The product of the acceleration coefficient of the offline accelerated test, the number of offline tests and the duration of a single test is determined as the corrosion resistance test result of the metal bipolar plate.

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