Apparatus for evaluating ion elution of metal components for hydrogen production by electrolysis of water and test method

Abstract

The embodiment of the application provides an electrolytic water hydrogen production metal component ion elution evaluation device and a test method, in the scheme, the communication state of different pipelines can be adjusted through the adapter and other structures, so that the test under different combination conditions is simulated; the ion purification part is used for reducing the metal ion concentration in the solution and collecting trace metal ions eluted in the test process, so that the corrosion behavior of the metal part, the influence degree of the impurity ions and the resin consumption demand of the purification are provided. Therefore, the scheme can perform multi-working condition coupling test on the metal part, simulate various working conditions in the real service environment of the acid / alkali hydrogen production, and make the evaluation test result more matched with the real service environment. Combined with ion purification and collection, more valuable guidance can be provided for actual industrial application. Moreover, the scheme avoids the problems of difficult data correlation, calculation, many interference factors and complicated operation when multiple devices are used for test.

Description

Technical Field

[0001] This invention relates to the field of proton exchange membrane electrolysis for hydrogen production technology, and more specifically, to an evaluation device and testing method for ion dissolution of metal components in water electrolysis for hydrogen production. Background Technology

[0002] In water electrolysis hydrogen production systems, metal components are subjected to harsh operating conditions over extended periods (e.g., high anode potential, acidic / alkaline test electrolytes, high temperatures, and scouring by circulating water). Under these conditions, continuous corrosion occurs on the surfaces of these metal components, leading to the continuous dissolution of metal ions such as Fe, Ni, Cr, and Ti. These dissolved metal ions, once inside the system, can affect the performance of proton exchange membranes or diaphragms, catalyst layers, and membrane electrode interfaces. Therefore, accurate evaluation of the ion dissolution behavior of metal components and corresponding ion purification methods is necessary.

[0003] Existing evaluation devices and testing methods mainly include static immersion testing, electrochemical corrosion testing, and dynamic flow corrosion testing. Static immersion testing involves immersing a metal sample in a simulated solution and evaluating the ion dissolution behavior of the material by detecting the concentration of metal ions in the solution. However, this method cannot reflect the influence of anodic potential and flow erosion on corrosion behavior. Electrochemical corrosion testing uses the metal sample as the working electrode, applying a potential and measuring parameters such as corrosion current and electrochemical impedance to evaluate the material's corrosion tendency. However, conventional tests are mostly conducted under static or weakly stirred conditions, making it difficult to simulate the disturbance of circulating water flow on the metal surface. Dynamic flow corrosion testing uses a pump and circulation pipeline to allow the test solution to flow over the surface of the metal sample, simulating fluid erosion, but it typically lacks the three-electrode electrochemical loading function under flowing conditions.

[0004] Therefore, existing technologies still have the following shortcomings: First, it is difficult to simultaneously simulate key operating conditions such as electrochemical potential, test electrolytes with different acidity and alkalinity, temperature, and flow erosion in the same system, resulting in significant deviations between test conditions and actual service environments. Second, it is difficult to compare corrosion differences under impurity-containing solutions and purified solutions, making it impossible to effectively evaluate the impact of impurity ions on corrosion behavior. In other words, the evaluation of metal components for water electrolysis hydrogen production in existing technologies is relatively singular, making it difficult to conduct multi-condition coupled testing, resulting in insufficient guidance for practical industrial applications from the evaluation test results. Summary of the Invention

[0005] This invention provides an ion dissolution evaluation device and testing method for metal components used in water electrolysis to produce hydrogen, which solves the problem that the evaluation of metal components used in water electrolysis to produce hydrogen is relatively simple and difficult to conduct multi-condition coupled testing, resulting in insufficient guidance for practical industrial applications of the evaluation and testing results.

[0006] To address the aforementioned problems, according to one aspect of the present invention, an ion dissolution evaluation device for metal components in water electrolysis for hydrogen production is provided, comprising a storage tank, a heating device, an output pipeline, a return pipeline, a first test branch, a second test branch, a three-electrode electrolytic cell, a purification branch, a direct branch, an ion purification section, and a transfer section; the storage tank is used to store the test electrolyte, which is either an acidic or alkaline electrolyte; the storage tank is disposed within the heating device, which provides a set temperature environment for the storage tank; the three-electrode electrolytic cell is installed in the first test branch, and the three-electrode electrolytic cell is used to set... The metal part to be tested is placed in the test circuit. The second test branch is used to connect the metal tube to be tested. The ion purification unit is installed in the purification branch and is used to remove metal ions from the test electrolyte in the purification branch. The outlet of the storage tank is connected to the output pipeline, the inlet of the storage tank is connected to the return pipeline, the output pipeline can be selectively connected to the first test branch or the second test branch, the return pipeline can be selectively connected to the purification branch or the straight-through branch, the inlet of the adapter can be selectively connected to the first test branch or the second test branch, and the outlet of the adapter can be selectively connected to the purification branch or the straight-through branch.

[0007] Furthermore, the ion purification unit includes a first-stage ion exchange column and a second-stage ion exchange column connected in series. In the flow direction of the test electrolyte, the first-stage ion exchange column is located upstream of the second-stage ion exchange column, and both the first-stage and second-stage ion exchange columns are filled with ion exchange resin.

[0008] Furthermore, the purification branch includes a first purification tube, a second purification tube, and a third purification tube. The first purification tube, the first-stage ion exchange column, the second purification tube, the second-stage ion exchange column, and the third purification tube are connected in sequence. The first purification tube is used to connect to the outlet of the transfer section, and the third purification tube is used to connect to the reflux pipeline. Each of the first, second, and third purification tubes is equipped with an openable and closable sampling valve, which is used to sample the test electrolyte.

[0009] Furthermore, the first test branch includes a first connector and a second connector. One end of the first connector is connected to the inlet of the three-electrode electrolytic cell, and the other end of the first connector is connected to the output pipeline. One end of the second connector is connected to the outlet of the three-electrode electrolytic cell, and the other end of the second connector is connected to the inlet of the adapter. And / or, the ion dissolution evaluation device for the water electrolysis hydrogen production metal component also includes an electrochemical workstation. The electrochemical workstation is connected to the three-electrode electrolytic cell via a cable. The electrochemical workstation is used to apply a set electrochemical potential or scanning potential to the metal component and record the change of the current density of the metal component over time.

[0010] Furthermore, the second test branch includes a third connector, a fourth connector, a first elastic connector, and a second elastic connector. One end of the third connector is used to connect with the output pipeline, and the first elastic connector is installed at the other end of the third connector. One end of the fourth connector is used to connect with the inlet of the adapter, and the second elastic connector is installed at the other end of the fourth connector. The first elastic connector and the second elastic connector are respectively used to seal and connect with both ends of the metal pipe. Both the first elastic connector and the second elastic connector can be radially elastically deformed to adapt to metal pipes of different diameters.

[0011] Furthermore, the transition section includes a first three-way switching valve and a second three-way switching valve. The first valve port of the first three-way switching valve and the first valve port of the second three-way switching valve are connected. The second valve port and the third valve port of the first three-way switching valve are respectively connected to the first test branch and the second test branch. The second valve port and the third valve port of the second three-way switching valve are respectively connected to the purification branch and the straight-through branch. And / or, the ion dissolution evaluation device for the metal components of the water electrolysis hydrogen production system also includes a third three-way switching valve and a fourth three-way switching valve. The first valve port of the third three-way switching valve is connected to the output pipeline. The second valve port and the third valve port of the third three-way switching valve are respectively connected to the first test branch and the second test branch. The first valve port of the fourth three-way switching valve is connected to the return pipeline. The second valve port and the third valve port of the fourth three-way switching valve are respectively connected to the purification branch and the straight-through branch.

[0012] Furthermore, the ion dissolution assessment device for the metal components of water electrolysis hydrogen production also includes a delivery pump made of acid and alkali resistant plastic material. The delivery pump is installed in the output pipeline, and the flow rate of the delivery pump is adjustable.

[0013] According to another aspect of the present invention, a testing method is provided for the above-described electrolytic water hydrogen production metal component ion dissolution evaluation device. The testing method includes a purification testing step, which includes: installing a brand new three-electrode electrolytic cell with a known external surface area on the three-electrode electrolytic cell in the first test branch. A Metal parts, or new components with known inner surface area installed in the second test branch. A The metal pipes, metal parts, and metal tubes are all referred to as metal components; a brand-new ion purification unit is installed in the purification branch, which contains ion exchange resin; the purification branch is opened and the straight-through branch is closed; the temperature and pH of the test electrolyte in the storage tank and the flow rate of the test electrolyte delivered by the output pipeline are set, and the continuous running time is determined. T After operation, remove the ion purification unit and use a volume of [missing information]. V The eluent washes away the metal ions adsorbed by the ion exchange resin in the ion purification section; the concentration of metal ions in the eluent is determined by inductively coupled plasma mass spectrometry. C ;according to A, T, V, C Calculate the average ion dissolution rate of the metal components under the test electrolyte purification conditions. Rpure .

[0014] Furthermore, the testing method also includes an impurity testing step, which includes: installing a brand new three-electrode electrolytic cell with a known external surface area on the first test branch. A Metal parts, or new components with known inner surface area installed in the second test branch. A The metal pipe; close the purification branch and open the straight-through branch; set the temperature of the test electrolyte in the storage tank and the flow rate of the test electrolyte delivered by the output pipeline, and the continuous running time. T Before operation, the initial concentration of the target metal ions in the test electrolyte was determined. C 0. After operation, the endpoint concentration of the target metal ions in the test electrolyte is measured. C t The total volume of the test electrolyte in the electrolytic hydrogen production metal component ion dissolution evaluation device is: V total ,according to A, T, C 0 、C t 、V total Calculate the average ion dissolution rate of metal components under conditions where the electrolyte contains impurities. R impure .

[0015] Furthermore, the testing method also includes: when testing the metal part using the first test branch, calculating the factor by which the presence of impurity ions increases the ion dissolution rate of the metal part under the conditions of electrochemical potential + test electrolyte + flowing scouring using the following formula: ,in, When testing the metal tube using the second test branch, the following formula is used to calculate the factor by which the presence of impurity ions increases the ion dissolution rate of the metal tube under the conditions of test electrolyte + flowing scouring: ,in, .

[0016] Furthermore, in the purification test step, when the metal component is tested using the first test branch, the purification test step also includes: applying a set electrochemical potential to the metal component and recording the current density of the stabilized metal component. I pure+E In the impurity testing step, when the metal part is tested using the first test branch, the impurity testing step further includes: applying a set electrochemical potential to the metal part and recording the current density of the metal part after stabilization. I impure+E .

[0017] Furthermore, the testing method also includes: calculating, using the following formula, the factor by which the presence of impurity ions increases the current density of the metal component under electrochemical potential + test electrolyte + flowing scouring conditions: .

[0018] Furthermore, the testing method also includes a resin usage prediction step, which includes: installing a brand-new ion purification unit in the purification branch, wherein the mass of ion exchange resin in the ion purification unit is... m test Open the purification branch and close the direct branch; open the first test branch and close the second test branch; do not install metal parts or electrodes in the three-electrode electrolysis cell; add a volume of [volume missing] to the storage tank. V test The metal ion electrolyte was set with its temperature and flow rate set, and continuously circulated for a sufficient time to allow the ion exchange resin to adsorb metal ions until saturation, then the operation was stopped. Before operation, the initial concentration of the target metal ions in the metal ion electrolyte was measured. C before After operation, the endpoint concentration of the target metal ions in the metal ion electrolyte is measured. C after Calculate the ion adsorption equivalent per unit mass of ion exchange resin based on the obtained parameters. Q Set the metal parts to be tested in T long Under stable operation over a given time period, calculate the required mass of ion exchange resin based on the acquired parameters. m long .

[0019] Furthermore, the ion adsorption equivalent per unit mass of ion exchange resin is calculated based on the obtained parameters. Q This includes: setting the valence state of the target metal ion as... n test molar mass is M mol , Q Calculated using the following formula: ； Calculate the required mass of ion exchange resin based on the obtained parameters. m long This includes: the exposed area of ​​the metal parts to be tested. A pure The valence state of the dissolved ions is n pure , m long Calculated using the following formula: .

[0020] Furthermore, in the purification test step, when the metal component is tested using the first test branch, the purification test step also includes: recording the change of current in the metal component over time, and recording the running time. T The recorded current I(t) is integrated over time to obtain the charge Z, which is then converted into the equivalent electrochemical oxidation amount m of the metal part. EC The amount of metal ions eluted from the ion purification unit and the amount of residual metal ions in the test electrolyte of the ion dissolution evaluation device for metal components in water electrolysis hydrogen production are obtained to determine the total amount of migratory metal ions actually released by the metal component, m. ion ; Calculate and evaluate the correlation value K between the electrochemical corrosion of metal parts and the actual release of metal ions. EI K EI =m ion / m EC .

[0021] In this scheme, the metal components under test can be tested under set acid / alkaline and high-temperature environments via a storage tank and heating device. The first test branch and three-electrode electrolytic cell can test the metal components under electrochemical potential + flow scouring conditions. The second test branch can test the metal components under flow scouring conditions. The purification branch and ion purification unit can test the metal components under solution purification conditions. The straight-through branch can test the metal components under solution containing impurities. Furthermore, the connection state of different pipelines can be adjusted via interchanges and other structures to simulate tests under different combinations of conditions. The ion purification unit is used to reduce the concentration of metal ions in the solution and collect trace metal ions dissolved during the test, thus providing a basis for evaluating the corrosion behavior of the metal components, the degree of influence of impurity ions, and the required amount of purification resin. Therefore, this scheme can perform multi-condition coupled testing of metal components, simulating various operating conditions in the real-world acid / alkaline hydrogen production environment. The evaluation results are more closely matched to the real-world operating environment. Combined with ion purification and collection, it can provide more valuable guidance for practical industrial applications. Furthermore, this approach avoids the problems of data correlation, calculation, numerous interference factors, and cumbersome operation when using multiple devices for testing. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 A schematic diagram of an ion dissolution evaluation device for metal components in water electrolysis hydrogen production, provided by an embodiment of the present invention, is shown.

[0023] The above figures include the following reference numerals: 11. Storage tank; 12. Heating device; 13. Output pipeline; 14. Return pipeline; 15. Transfer pump; 20. First test branch; 21. First takeover; 22. Second takeover; 30. Second test branch; 31. Third connecting pipe; 32. Fourth connecting pipe; 33. First flexible joint; 34. Second flexible joint; 41. Three-electrode electrolytic cell; 42. Electrochemical workstation; 50. Purification branch; 51. First purification pipe; 52. Second purification pipe; 53. Third purification pipe; 60. Direct access to a side road; 70. Ion purification section; 71. First-stage ion exchange column; 72. Second-stage ion exchange column; 80. Adapter; 81. First three-way switching valve; 82. Second three-way switching valve; 91. Third three-way switching valve; 92. Fourth three-way switching valve. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1As shown, an embodiment of the present invention provides an ion dissolution evaluation device for metal components in water electrolysis hydrogen production, including a storage tank 11, a heating device 12, an output pipeline 13, a return pipeline 14, a first test branch 20, a second test branch 30, a three-electrode electrolytic cell 41, a purification branch 50, a direct branch 60, an ion purification section 70, and a connecting section 80. The storage tank 11 is used to store the test electrolyte, which can be an acidic or alkaline electrolyte. The storage tank 11 is disposed within the heating device 12, which provides a set temperature environment for the storage tank 11. The three-electrode electrolytic cell 41 is installed in the first test branch 20, and the metal to be tested is placed inside the three-electrode electrolytic cell 41. The second test branch 30 is used to connect the metal tube to be tested. The ion purification unit 70 is installed in the purification branch 50 and is used to remove metal ions from the test electrolyte in the purification branch 50. The outlet of the storage tank 11 is connected to the output pipe 13, the inlet of the storage tank 11 is connected to the return pipe 14, the output pipe 13 can be selectively connected to the first test branch 20 or the second test branch 30, the return pipe 14 can be selectively connected to the purification branch 50 or the straight-through branch 60, the inlet of the adapter 80 can be selectively connected to the first test branch 20 or the second test branch 30, and the outlet of the adapter 80 can be selectively connected to the purification branch 50 or the straight-through branch 60.

[0026] The term "test electrolyte" as used in this application refers to an electrolyte used to simulate the actual service environment of metal components in a water electrolysis hydrogen production system. It can be an acidic electrolyte or an alkaline electrolyte. Acidic electrolytes are used to simulate acidic water electrolysis hydrogen production systems, while alkaline electrolytes are used to simulate alkaline water electrolysis hydrogen production systems. During testing, the composition, pH value, temperature, flow rate of the electrolyte, and the electrochemical potential experienced by the metal components can be set according to the target system.

[0027] In this scheme, the storage tank 11 and heating device 12 can be used to test the metal component under set acidic and high-temperature environments. The first test branch 20 and three-electrode electrolytic cell 41 can be used to test the metal component under electrochemical potential + flow scouring conditions. The second test branch 30 can be used to test the metal component under flow scouring conditions. The purification branch 50 and ion purification unit 70 can be used to test the metal component under solution purification conditions. The straight-through branch 60 can be used to test the metal component under solution containing impurities. Furthermore, the connection state of different pipelines can be adjusted through structures such as the adapter 80, thereby simulating tests under different combinations of conditions. Among them, the ion purification unit 70 is used to reduce the concentration of metal ions in the solution and to collect trace metal ions dissolved during the test, thereby providing a basis for evaluating the corrosion behavior of the metal component, the degree of influence of impurity ions, and the required amount of purification resin. Therefore, this scheme enables multi-condition coupled testing of metal components, simulating various operating conditions in real-world acid / alkaline hydrogen production environments. The evaluation results more closely match the actual service environment, and combined with ion purification and collection, it provides more valuable guidance for practical industrial applications. Furthermore, this scheme avoids the problems of data correlation difficulties, computational complexity, numerous interference factors, and cumbersome operation associated with testing with multiple devices. Moreover, this device simplifies the assessment of corrosion resistance of metal components in hydrogen production units, eliminating the need for sampling and observation from existing equipment and enabling in-situ characterization outside the device.

[0028] Existing testing methods cannot simultaneously simulate electrochemical potential, test electrolytes with different acidity and alkalinity, high temperature, and flowing erosion service conditions. This invention applies a high potential to the metal component under test using an electrochemical workstation 42 to simulate the electrochemical driving force; a delivery pump 15 provides a circulating solution with an adjustable flow rate to simulate the mechanical action of water erosion; and a heating device 12 and a storage tank 11 control the solution temperature and pH, respectively, to construct a chemical environment matching the target water electrolysis hydrogen production system. This makes the testing conditions closer to the actual service environment of the water electrolysis metal component, and the obtained corrosion current density and ion dissolution rate are more representative.

[0029] The ion purification unit 70 includes a first-stage ion exchange column 71 and a second-stage ion exchange column 72 connected in series. In the flow direction of the test electrolyte, the first-stage ion exchange column 71 is located upstream of the second-stage ion exchange column 72. Both the first-stage ion exchange column 71 and the second-stage ion exchange column 72 are filled with ion exchange resin. The first-stage ion exchange column 71 can adsorb most of the metal ions in the test electrolyte. The second-stage ion exchange column 72 further adsorbs the metal ions in the test electrolyte, thus improving the adsorption effect.

[0030] Optionally, the first-stage ion exchange column 71 and the second-stage ion exchange column 72 can be equipped with ion exchange resins suitable for the acidity or alkalinity of the test electrolyte, the type and concentration of the target metal ions. The first-stage ion exchange column 71 is used to perform the main metal ion capture function, and the second-stage ion exchange column 72 is used to further capture residual metal ions that may penetrate the first-stage ion exchange column 71, so as to improve the purification and cumulative capture effect.

[0031] Specifically, the purification branch 50 includes a first purification tube 51, a second purification tube 52, and a third purification tube 53. The first purification tube 51, the first-stage ion exchange column 71, the second purification tube 52, the second-stage ion exchange column 72, and the third purification tube 53 are connected in sequence. The first purification tube 51 is used to connect to the outlet of the adapter 80, and the third purification tube 53 is used to connect to the reflux pipeline 14. Each of the first purification tube 51, the second purification tube 52, and the third purification tube 53 is equipped with an openable and closable sampling valve, which is used to sample the test electrolyte.

[0032] After sampling the test electrolyte from different purification tubes, the solution is analyzed by ICP-MS to obtain the concentration of metal ions in the test electrolyte. The adsorption effect of the ion exchange resin on metal ions can be judged based on the detected metal ion concentration.

[0033] like Figure 1 As shown, the first test branch 20 includes a first connector 21 and a second connector 22. One end of the first connector 21 is connected to the inlet of the three-electrode electrolytic cell 41, and the other end is connected to the output pipeline 13. One end of the second connector 22 is connected to the outlet of the three-electrode electrolytic cell 41, and the other end is connected to the inlet of the adapter 80. The ion dissolution evaluation device for metal components in water electrolysis hydrogen production also includes an electrochemical workstation 42. The electrochemical workstation 42 is connected to the three-electrode electrolytic cell 41 via a cable. The electrochemical workstation 42 is used to apply a set electrochemical potential or scanning potential to the metal component and record the change of the current density of the metal component over time.

[0034] By applying an electrochemical potential or scanning potential through the electrochemical workstation 42, the electrochemical corrosion environment of the metal components used in the water electrolysis hydrogen production process can be simulated under actual working conditions, thereby detecting and evaluating the ion dissolution of the metal components under this environment.

[0035] In some embodiments, the second test branch 30 includes a third connector 31, a fourth connector 32, a first elastic connector 33, and a second elastic connector 34. One end of the third connector 31 is used to communicate with the output pipe 13, and the first elastic connector 33 is installed at the other end of the third connector 31. One end of the fourth connector 32 is used to communicate with the inlet of the adapter 80, and the second elastic connector 34 is installed at the other end of the fourth connector 32. The first elastic connector 33 and the second elastic connector 34 are respectively used to seal and connect with both ends of the metal pipe. Both the first elastic connector 33 and the second elastic connector 34 can be radially elastically deformed to adapt to metal pipes of different diameters.

[0036] When using this electrolytic water hydrogen production metal component ion dissolution evaluation device, it is necessary to be able to detect metal tubes of different diameters and thicknesses to improve the device's versatility. Since both the first elastic joint 33 and the second elastic joint 34 can be radially elastically deformed, they can be fitted onto the ends of metal tubes of different diameters and achieve a seal, thus realizing the connection with the metal tube with a simple structure.

[0037] Optionally, in order to improve the connection strength with the metal pipe and prevent leakage or detachment during use, the second test branch 30 also includes an adjustable clamp, which is fitted onto the first elastic joint 33 and the second elastic joint 34, thus achieving reliable fixation of both ends of the metal pipe.

[0038] like Figure 1 As shown, the adapter 80 includes a first three-way switching valve 81 and a second three-way switching valve 82. The first valve port of the first three-way switching valve 81 and the first valve port of the second three-way switching valve 82 are connected. The second valve port and the third valve port of the first three-way switching valve 81 are connected to the first test branch 20 and the second test branch 30, respectively. The second valve port and the third valve port of the second three-way switching valve 82 are connected to the purification branch 50 and the straight-through branch 60, respectively.

[0039] The first three-way switching valve 81 is used to switch the connection with one of the test branches, the first test branch 20 and the second test branch 30. The second three-way switching valve 82 is used to switch the connection with one of the purification branch 50 and the straight-through branch 60. By cooperating with the two switching valves, different pipeline connections can be switched to meet testing requirements, and the operation is convenient.

[0040] The electrolytic hydrogen production metal component ion dissolution evaluation device also includes a third three-way switching valve 91 and a fourth three-way switching valve 92. The first valve port of the third three-way switching valve 91 is connected to the output pipeline 13, and the second and third valve ports of the third three-way switching valve 91 are connected to the first test branch 20 and the second test branch 30, respectively. The first valve port of the fourth three-way switching valve 92 is connected to the return pipeline 14, and the second and third valve ports of the fourth three-way switching valve 92 are connected to the purification branch 50 and the straight-through branch 60, respectively.

[0041] The third three-way switching valve 91 is used to switch the connection with one of the test branches, the first test branch 20 and the second test branch 30, and the fourth three-way switching valve 92 is used to switch the connection with one of the purification branch 50 and the straight-through branch 60. Through the cooperation of multiple switching valves, multi-condition coupled testing of metal components can be performed, simulating various operating conditions in real service environments, and the operation is convenient.

[0042] This invention, through the inclusion of a transfer section 80 and a two-stage ion exchange purification branch, allows for online switching between two states: a solution containing impurities and a purified solution, without changing the circulating medium (i.e., the test electrolyte) or altering the main test structure. This enables a comparative analysis of corrosion parameters before and after purification. This design achieves rigorous control experiments on the sole variable of "metal ion impurities," eliminating interference from batch differences and time drift, and significantly improving the accuracy and reliability of the measurement of various impurity ion sensitivity coefficients.

[0043] Furthermore, the ion dissolution evaluation device for the metal components of water electrolysis hydrogen production also includes a delivery pump 15 made of acid and alkali resistant plastic material. The delivery pump 15 is installed in the output pipeline 13, and its flow rate is adjustable. The delivery pump 15 provides power for the flow of the test electrolyte, and its flow rate can be adjusted to meet testing requirements.

[0044] Currently, the field of hydrogen production through water electrolysis lacks systematic testing schemes and evaluation standards for the ion dissolution behavior of metal components. Existing testing methods are insufficient to quantify the degree of corrosion and lack a basis for judgment. This scheme, through multi-field coupled operating condition simulation, parallel dual test branches, and online purification switching, can reproduce the actual environmental conditions of the water electrolysis system at the laboratory level, providing a quantifiable evaluation method for metal material screening and ion purification scheme design.

[0045] Through the coordination of the electrochemical workstation 42, the delivery pump 15, and the heating device 12 (e.g., a water bath), four key factors—electrochemical potential, flow scouring intensity, temperature, and pH—can be independently controlled, making the test conditions closer to the actual service environment of metal components in the water electrolysis hydrogen production system. This solution allows switching between impurity-containing solution and purified solution media states within the same test system. It enables the comparison of corrosion parameters before and after purification without changing the circulating medium, the main test structure, or the main operating parameters, effectively reducing systematic errors caused by batch differences and inconsistent test conditions.

[0046] Another aspect of the present invention provides a testing method for the above-mentioned electrolytic hydrogen production metal component ion dissolution evaluation device. The testing method includes a purification testing step, which includes: installing a brand new known external surface area electrolytic cell 41 on the three-electrode electrolytic cell 41 on the first test branch 20.A The metal parts, or the new known inner surface area installed in the second test branch 30. A Metal tubes, metal parts, and metal pipes are all referred to as metal components; among them, A The area exposed to the test electrolyte is also called the exposure area; a brand-new ion purification unit 70 is installed in the purification branch 50, which contains ion exchange resin; the purification branch 50 is turned on and the straight-through branch 60 is turned off; the temperature of the test electrolyte in the storage tank 11 and the flow rate of the test electrolyte delivered by the output pipeline 13 are set, and the continuous running time is determined. T After operation, remove the ion purification unit 70 and use a volume of... V The eluent washes away the metal ions adsorbed by the ion exchange resin in the ion purification section 70; the concentration of metal ions in the eluent is determined by inductively coupled plasma mass spectrometry. C ;according to A, T, V, C Calculate the average ion dissolution rate of the metal components under the test electrolyte purification conditions. R pure The above steps can be used to obtain the average ion dissolution rate of metal parts or metal tubes under the test electrolyte purification conditions.

[0047] The ion purification unit 70 includes a first-stage ion exchange column 71 and a second-stage ion exchange column 72 connected in series. In the flow direction of the test electrolyte, the first-stage ion exchange column 71 is located upstream of the second-stage ion exchange column 72. Both the first-stage ion exchange column 71 and the second-stage ion exchange column 72 are filled with ion exchange resin. The first-stage ion exchange column 71 undertakes the main function of accumulating and capturing metal ions, while the second-stage ion exchange column 72 is used to further capture residual metal ions that may have penetrated through the first-stage ion exchange column 71.

[0048] Optionally, the purification test steps include: cleaning the first-stage ion exchange column 71 and the second-stage ion exchange column 72 with eluent, detecting the concentration of metal ions in the eluent after cleaning, and calculating the amount of metal ions eluted. By comparing the amount of metal ions eluted, the adequacy of metal ion capture during operation can be verified.

[0049] Furthermore, the testing method also includes an impurity testing step, which includes: installing a brand-new metal component with a known outer surface area A on the three-electrode electrolytic cell 41 in the first test branch 20, or installing a brand-new metal tube with a known inner surface area A on the second test branch 30; closing the purification branch 50 and opening the direct branch 60; setting the temperature, pH, and flow rate of the test electrolyte delivered by the output pipeline 13 in the storage tank 11, and continuously running for a time T; measuring the initial concentration C0 of the target metal ions in the test electrolyte before operation, and measuring the final concentration C of the target metal ions in the test electrolyte after operation. t The total volume of the test electrolyte in the ion dissolution evaluation device for metal components in water electrolysis hydrogen production is V. total According to A, T, C0, C t V total Calculate the average ion dissolution rate R of the metal components under conditions where the electrolyte contains impurities. impure The above steps can be used to obtain the average ion dissolution rate of metal parts or tubes under conditions where the test electrolyte contains impurities.

[0050] Furthermore, when testing the metal parts using the first test branch 20, the following formula is used to calculate the factor by which the presence of impurity ions increases the ion dissolution rate of the metal parts under the conditions of electrochemical potential + test electrolyte + flow scouring: ,in, ; When testing the metal tube using the second test branch 30, the following formula is used to calculate the factor by which the presence of impurity ions increases the ion dissolution rate of the metal tube under the conditions of test electrolyte + flowing scouring: ,in, By detecting, calculating, and comparing these parameters, the impact of impurity ions in the test electrolyte on the ion dissolution rate of metal components relative to the absence of impurity ions can be determined, providing a basis for product development and verification.

[0051] Furthermore, in the purification test step, when the metal component is tested using the first test branch 20, the purification test step also includes: applying a set electrochemical potential to the metal component and recording the current density of the stabilized metal component. I pure+E In the impurity testing step, when the metal part is tested using the first test branch 20, the impurity testing step further includes: applying a set electrochemical potential to the metal part and recording the current density of the metal part after stabilization. I impure+E By comparing the two current densities mentioned above, we can understand the impact of the test electrolyte containing impurities on the electrochemical corrosion of metal parts compared to the test electrolyte without impurities.

[0052] Specifically, the test method also includes: calculating, using the following formula, the factor by which the presence of impurity ions increases the current density of the metal component under the conditions of electrochemical potential + test electrolyte + flowing scouring: .

[0053] Existing ion purification methods utilize ion exchange resins to remove metal ions from solutions and evaluate the purification effect based on changes in ion concentration before and after purification. However, these methods are typically used as independent purification evaluation tools and are difficult to integrate with corrosion testing of metal components. Therefore, current technologies lack an effective method for converting laboratory-measured ion dissolution rates into the amount of ion exchange resin used in engineering applications and a basis for designing replacement cycles.

[0054] To address this issue, the testing method also includes a resin usage prediction step, which involves installing a brand-new ion purification unit 70 in the purification branch 50. The mass of ion exchange resin in the ion purification unit 70 is... m test Open the purification branch 50 and close the direct branch 60; open the first test branch 20 and close the second test branch 30; no metal parts or electrodes are installed in the three-electrode electrolytic cell 41; add a volume of [volume missing] to the storage tank 11. V test The metal ion electrolyte was set with its temperature and flow rate set, and continuously circulated for a sufficient time to allow the ion exchange resin to adsorb metal ions until saturation, then the operation was stopped. Before operation, the initial concentration of the target metal ions in the metal ion electrolyte was measured. C before After operation, the endpoint concentration of the target metal ions in the metal ion electrolyte is measured. C after Calculate the ion adsorption equivalent per unit mass of ion exchange resin based on the obtained parameters. Q Set the metal parts to be tested in T long Under stable operation over a given time period, calculate the required mass of ion exchange resin based on the acquired parameters. m long .

[0055] Specifically, the ion adsorption equivalent per unit mass of ion exchange resin is calculated based on the obtained parameters. Q This includes: setting the valence state of the target metal ion as... n test molar mass is M mol , Q Calculated using the following formula: ； Calculate the required mass of ion exchange resin based on the obtained parameters. m long This includes: the exposed area of ​​the metal parts to be tested. A pure The valence state of the dissolved ions is n pure , m long Calculated using the following formula: .

[0056] Existing technologies lack a method to correlate laboratory-measured ion dissolution rates with the required amount of ion exchange resin in practical engineering applications. This leads to reliance on experience or over-configuration in the design of water electrolysis systems, resulting in waste or insufficient purification. This invention establishes a quantitative conversion relationship between ion dissolution rates and the required resin mass. Based on this formula, the theoretically required resin mass for long-term stable operation can be directly calculated, filling the technological gap between laboratory material selection and industrial purification scheme design. The formula can also be used to approximately estimate the required ion exchange resin mass for different exposure areas and operating conditions, providing guidance for engineering application development.

[0057] This method correlates the experimentally measured metal ion dissolution rate, the exposed area of ​​the metal component under test, the target operating time, and the adsorption capacity per unit mass of resin, establishing a conversion relationship for the required mass of ion exchange resin under engineering operating conditions. The results can be further used for capacity design and maintenance cycle assessment of ion purification schemes in water electrolysis systems.

[0058] The performance of a water electrolysis hydrogen production system is directly affected not only by the amount of electrochemical reaction occurring on the metal surface, but more importantly by the amount of metal that ultimately enters the circulating medium as migratable ions and further interacts with the membrane or proton exchange membrane, catalyst layer, or membrane electrode interface. Traditional electrochemical tests mainly record parameters such as corrosion current and charge, which can characterize the degree of electrochemical reaction, but cannot be directly equated to the actual amount of metal ions released; and a single sampling of the circulating liquid is difficult to accurately reflect the cumulative release of low-concentration ions over the entire test cycle.

[0059] Existing evaluation methods typically use electrochemical corrosion parameters and metal ion dissolution rates to assess material corrosion behavior separately. They lack a method to quantitatively correlate the electrochemical response with the actual metal ion release within the same testing cycle, making it difficult to further evaluate the correspondence between the electrochemical corrosion behavior and the actual ion contamination risk of metal components. Therefore, this invention aims to establish a quantitative relationship between "electrochemical corrosion—actual ion migration" of materials by placing the current-time integral and the cumulative metal ion capture measurement paths within the same sample, under the same operating conditions, and within the same testing cycle, while maintaining multi-field coupled corrosion testing capabilities.

[0060] To achieve this objective, in the purification test procedure, when testing the metal component using the first test branch 20, the purification test procedure also includes: recording the change in current of the metal component over time, and monitoring the running time. T The recorded current I(t) is integrated over time to obtain the charge Z, which is then converted into the equivalent electrochemical oxidation amount m of the metal part. EC The amount of metal ions eluted from the ion purification unit 70 and the amount of residual metal ions in the test electrolyte of the water electrolysis hydrogen production metal component ion dissolution evaluation device are obtained to obtain the total amount of migratory metal ions actually released by the metal component, m. ion ; Calculate and evaluate the correlation value K between the electrochemical corrosion of metal parts and the actual release of metal ions. EI K EI =m ion / m EC .

[0061] Among them, Z is converted into the equivalent electrochemical oxidation amount m of the metal part. EC The formula is: In the formula, M is the molar mass of the target metal, n is the number of electrons transferred during the corrosion process of the target metal, and F is the Faraday constant.

[0062] Corrosion films adhering to the sample surface and solid corrosion products that do not enter the circulating medium in the form of soluble metal ions are not included in m. ion This scheme mainly evaluates the release behavior of metal ions that have entered the circulating medium and have the ability to migrate.

[0063] Calculated K EI The larger the value, the higher the tendency of the tested metal component to release metal ions into the test electrolyte under the same or similar electrochemical oxidation degree; K EI The smaller the value, the lower the actual amount of migratable metal ions released relative to the equivalent electrochemical oxidation. This coefficient is used to establish a quantitative link between traditional corrosion electrochemical evaluation and the actual ion contamination risk assessment of the system.

[0064] In a three-electrode testing mode, this invention can further integrate the current over time within a test cycle and quantitatively correlate it with the actual metal ion release amount measured within the same test cycle, thereby evaluating the correspondence between the electrochemical corrosion behavior and the actual ion release behavior of metal components. This evaluation method avoids the problem that evaluating materials solely based on electrochemical parameters such as corrosion current cannot directly reflect their metal ion release risk.

[0065] The above descriptions are merely some embodiments of this solution and are not intended to limit the solution. Various modifications and variations can be made to this solution by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this solution should be included within the scope of protection of this solution.

[0066] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0067] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0068] In the description of this solution, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the attached drawings. It is only for the convenience of describing this solution and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this solution. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0069] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0070] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this solution.

Claims

1. A device for evaluating the ion dissolution of metal components in water electrolysis for hydrogen production, characterized in that, The system includes a storage tank (11), a heating device (12), an output pipeline (13), a return pipeline (14), a first test branch (20), a second test branch (30), a three-electrode electrolytic cell (41), a purification branch (50), a direct branch (60), an ion purification section (70), and a connecting section (80). The storage tank (11) is used to store the test electrolyte, which is either an acidic or alkaline electrolyte. The storage tank (11) is located inside the heating device (12), which provides a set temperature environment for the storage tank (11). The three-electrode electrolytic cell (41) is installed in the first test branch (20) and is used to house the metal part to be tested. The second test branch (30) is used to connect the metal tube to be tested. The ion purification section (70) is connected to the metal tube to be tested. The purification unit (70) is installed in the purification branch (50). The ion purification unit (70) is used to remove metal ions from the test electrolyte in the purification branch (50). The outlet of the storage tank (11) is connected to the output pipeline (13), the inlet of the storage tank (11) is connected to the return pipeline (14), the output pipeline (13) can be selectively connected to the first test branch (20) or the second test branch (30), the return pipeline (14) can be selectively connected to the purification branch (50) or the straight-through branch (60), the inlet of the adapter (80) can be selectively connected to the first test branch (20) or the second test branch (30), and the outlet of the adapter (80) can be selectively connected to the purification branch (50) or the straight-through branch (60).

2. The ion dissolution evaluation device for metal components in water electrolysis hydrogen production according to claim 1, characterized in that, The ion purification unit (70) includes a first-stage ion exchange column (71) and a second-stage ion exchange column (72) connected in series. In the flow direction of the test electrolyte, the first-stage ion exchange column (71) is located upstream of the second-stage ion exchange column (72). Both the first-stage ion exchange column (71) and the second-stage ion exchange column (72) are filled with ion exchange resin.

3. The ion dissolution evaluation device for metal components in water electrolysis hydrogen production according to claim 2, characterized in that, The purification branch (50) includes a first purification tube (51), a second purification tube (52), and a third purification tube (53). The first purification tube (51), the first-stage ion exchange column (71), the second purification tube (52), the second-stage ion exchange column (72), and the third purification tube (53) are connected in sequence. The first purification tube (51) is used to connect to the outlet of the adapter (80), and the third purification tube (53) is used to connect to the reflux pipeline (14). The first purification tube (51), the second purification tube (52), and the third purification tube (53) are all equipped with openable and closable sampling valves, which are used to sample the test electrolyte.

4. The ion dissolution evaluation device for metal components in water electrolysis hydrogen production according to claim 1, characterized in that, The first test branch (20) includes a first connector (21) and a second connector (22). One end of the first connector (21) is connected to the inlet of the three-electrode electrolytic cell (41), and the other end of the first connector (21) is connected to the output pipeline (13). One end of the second connector (22) is connected to the outlet of the three-electrode electrolytic cell (41), and the other end of the second connector (22) is connected to the inlet of the adapter (80); and / or, The electrolytic hydrogen production metal component ion dissolution evaluation device also includes an electrochemical workstation (42), which is connected to the three-electrode electrolytic cell (41) via a cable. The electrochemical workstation (42) is used to apply a set electrochemical potential or scanning potential to the metal component and record the change of the current density of the metal component over time.

5. The ion dissolution evaluation device for metal components in water electrolysis hydrogen production according to claim 1, characterized in that, The second test branch (30) includes a third connector (31), a fourth connector (32), a first elastic connector (33), and a second elastic connector (34). One end of the third connector (31) is used to connect with the output pipeline (13). The first elastic connector (33) is installed at the other end of the third connector (31). One end of the fourth connector (32) is used to connect with the inlet of the adapter (80). The second elastic connector (34) is installed at the other end of the fourth connector (32). The first elastic connector (33) and the second elastic connector (34) are respectively used to seal and connect with both ends of the metal pipe. Both the first elastic connector (33) and the second elastic connector (34) can be radially elastically deformed to adapt to metal pipes of different diameters.

6. The ion dissolution evaluation device for metal components in water electrolysis hydrogen production according to claim 1, characterized in that, The adapter (80) includes a first three-way switching valve (81) and a second three-way switching valve (82). The first valve port of the first three-way switching valve (81) is connected to the first valve port of the second three-way switching valve (82). The second valve port and the third valve port of the first three-way switching valve (81) are connected to the first test branch (20) and the second test branch (30), respectively. The second valve port and the third valve port of the second three-way switching valve (82) are connected to the purification branch (50) and the straight-through branch (60), respectively; and / or, The electrolytic hydrogen production metal component ion dissolution evaluation device further includes a third three-way switching valve (91) and a fourth three-way switching valve (92). The first valve port of the third three-way switching valve (91) is connected to the output pipeline (13). The second and third valve ports of the third three-way switching valve (91) are connected to the first test branch (20) and the second test branch (30) respectively. The first valve port of the fourth three-way switching valve (92) is connected to the return pipeline (14). The second and third valve ports of the fourth three-way switching valve (92) are connected to the purification branch (50) and the straight-through branch (60) respectively.

7. The ion dissolution evaluation device for metal components in water electrolysis hydrogen production according to claim 1, characterized in that, The electrolytic hydrogen production metal component ion dissolution evaluation device also includes a delivery pump (15) made of acid and alkali resistant plastic material. The delivery pump (15) is installed in the output pipeline (13) and the flow rate of the delivery pump (15) is adjustable.

8. A testing method, characterized in that, The test method is used in the ion dissolution evaluation device for metal components in water electrolysis hydrogen production according to any one of claims 1 to 7, and the test method includes a purification test step, which includes: A new known external surface area is installed on the three-electrode electrolytic cell (41) on the first test branch (20). A Metal parts, or new known inner surface area components installed in the second test branch (30). A The metal tube, the metal part and the metal tube are both referred to as metal components; A new ion purification unit (70) is installed in the purification branch (50), the ion purification unit (70) contains ion exchange resin, the purification branch (50) is turned on and the direct branch (60) is turned off. The temperature and pH of the test electrolyte in the storage tank (11) and the flow rate of the test electrolyte delivered by the output pipeline (13) are set, and the continuous running time is determined. T ; After operation, the ion purification unit (70) was removed and a volume of [missing information] was used. V The eluent washes away the metal ions adsorbed by the ion exchange resin in the ion purification section (70); The concentration of metal ions in the eluent was determined by inductively coupled plasma mass spectrometry. C ; according to A, T, V, C Calculate the average ion dissolution rate of the metal components under test electrolyte purification conditions. R pure .

9. The test method according to claim 8, characterized in that, The testing method further includes an impurity testing step, which includes: A new known external surface area is installed on the three-electrode electrolytic cell (41) on the first test branch (20). A Metal parts, or new known inner surface area components installed in the second test branch (30). A Metal pipe; Close the purification branch (50) and open the direct branch (60). The temperature of the test electrolyte in the storage tank (11) and the flow rate of the test electrolyte delivered by the output pipeline (13) are set, and the continuous running time is determined. T ; The initial concentration of the target metal ions in the test electrolyte was determined before operation. C 0. After operation, the endpoint concentration of the target metal ions in the test electrolyte is measured. C t ; The total volume of the test electrolyte in the ion dissolution evaluation device for the water electrolysis hydrogen production metal component is: V total ,according to A, T, C 0 、C t 、V total Calculate the average ion dissolution rate of the metal components under conditions where the test electrolyte contains impurities. R impure .

10. The test method according to claim 9, characterized in that, The testing method also includes: When the metal part is tested using the first test branch (20), the factor by which the ion dissolution rate of the metal part increases due to the presence of impurity ions under the conditions of electrochemical potential + test electrolyte + flow scouring is calculated using the following formula: ,in, ; When the metal tube is tested using the second test branch (30), the factor by which the presence of impurity ions increases the ion dissolution rate of the metal tube under test electrolyte + flow scouring conditions is calculated using the following formula: ,in, .

11. The test method according to claim 9, characterized in that, In the purification test step, when the metal component is tested using the first test branch (20), the purification test step further includes: applying a set electrochemical potential to the metal component and recording the current density of the metal component after stabilization. I pure+E ; In the impurity testing step, when the metal part is tested using the first test branch (20), the impurity testing step further includes: applying a set electrochemical potential to the metal part and recording the current density of the metal part after stabilization. I impure+E .

12. The test method according to claim 11, characterized in that, The testing method also includes: The following formula can be used to calculate the factor by which the presence of impurity ions increases the current density of the metal component under the conditions of electrochemical potential + test electrolyte + flowing scouring: .

13. The test method according to claim 8, characterized in that, The test method further includes a resin usage prediction step, which includes: A brand new ion purification unit (70) is installed in the purification branch (50), and the mass of the ion exchange resin in the ion purification unit (70) is... m test Open the purification branch (50) and close the direct branch (60). Open the first test branch (20), close the second test branch (30), and do not install any metal parts or electrodes in the three-electrode electrolytic cell (41); Add a volume of [volume value] to the storage tank (11) V test The metal ion electrolyte is set to a specific temperature and output flow rate, and then continuously circulated for a sufficient time to allow the ion exchange resin to adsorb metal ions until saturation, after which the operation is stopped. The initial concentration of the target metal ions in the metal ion electrolyte was determined before operation. C before After operation, the endpoint concentration of the target metal ions in the metal ion electrolyte is measured. C after ; Calculate the ion adsorption equivalent per unit mass of the ion exchange resin based on the obtained parameters. Q ; Set the metal parts to be tested in T long Under stable operation over a given time period, calculate the required mass of ion exchange resin based on the acquired parameters. m long .

14. The test method according to claim 13, characterized in that, Calculate the ion adsorption equivalent per unit mass of the ion exchange resin based on the obtained parameters. Q Includes: setting the valence state of the target metal ion as... n test molar mass is M mol , Q Calculated using the following formula: ； The required mass of the ion exchange resin is calculated based on the obtained parameters. m long This includes: the exposed area of ​​the metal parts to be tested. A pure The valence state of the dissolved ions is n pure , m long Calculated using the following formula: 。 15. The test method according to claim 8, characterized in that, In the purification test step, when the metal part is tested using the first test branch (20), the purification test step further includes: Record the change in current of the metal component over time, and calculate the running time. T The recorded current I(t) is integrated over time to obtain the charge Z, which is then converted into the equivalent electrochemical oxidation amount m of the metal component. EC ; The amount of metal ions eluted from the ion purification unit (70) and the amount of metal ions remaining in the test electrolyte of the water electrolysis hydrogen production metal component ion dissolution evaluation device are obtained to obtain the total amount of migratory metal ions actually released by the metal component, m. ion ; Calculate and evaluate the correlation value K between the electrochemical corrosion of the metal component and the actual metal ion release. EI K EI =m ion / m EC .

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