CN116499960A - Electrochemical multi-parameter acquisition and joint analysis method for titanium-based material corrosion process for bipolar plate - Google Patents
Electrochemical multi-parameter acquisition and joint analysis method for titanium-based material corrosion process for bipolar plate Download PDFInfo
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- 230000007797 corrosion Effects 0.000 title claims abstract description 79
- 238000005260 corrosion Methods 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 54
- 230000008569 process Effects 0.000 title claims abstract description 41
- 239000000463 material Substances 0.000 title claims abstract description 40
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000010936 titanium Substances 0.000 title claims abstract description 39
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 39
- 238000004458 analytical method Methods 0.000 title claims abstract description 24
- 238000001453 impedance spectrum Methods 0.000 claims abstract description 85
- 238000005259 measurement Methods 0.000 claims abstract description 46
- 230000008859 change Effects 0.000 claims abstract description 21
- 238000012360 testing method Methods 0.000 claims abstract description 19
- 239000008151 electrolyte solution Substances 0.000 claims abstract description 7
- 239000000243 solution Substances 0.000 claims abstract description 4
- 238000012544 monitoring process Methods 0.000 claims description 20
- 238000010586 diagram Methods 0.000 claims description 18
- 238000002847 impedance measurement Methods 0.000 claims description 5
- 230000035772 mutation Effects 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 3
- 238000005530 etching Methods 0.000 claims 5
- 230000010287 polarization Effects 0.000 abstract description 7
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 2
- 238000000627 alternating current impedance spectroscopy Methods 0.000 description 7
- 229910001069 Ti alloy Inorganic materials 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000012528 membrane Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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Abstract
The invention discloses an electrochemical multi-parameter acquisition and combined analysis method in a titanium-based material corrosion process for a bipolar plate, and aims to overcome the defects of low data relevance of independent constant potential polarization and alternating current impedance under constant potential in the existing metal bipolar plate corrosion resistance test technology. Parameter acquisition and joint analysis method: 1. placing a titanium-based material for bipolar plate in a solution containing H 2 SO 4 And in an electrolyte solution of HF, adopting an alternating current impedance measurement program to collect an alternating current impedance spectrum under bias voltage; 2. obtaining a corrosion current density of the impedance data points; 3. drawing a relation graph of effective corrosion current density and time in all bias alternating current impedance spectrum measurement; 4. the corrosion electrochemical process was analyzed by the abrupt change in effective corrosion current density, the magnitude of the capacitive arc resistance in the Nyquist plot, and the open circuit potential curve. According to the invention, the corrosion resistance of the titanium-based material in the service process is evaluated by comprehensively analyzing the evolution rules of corrosion current density, bias impedance and open circuit potential in the same time.
Description
Technical Field
The invention belongs to the field of new energy, and particularly relates to a method for simultaneously collecting and analyzing electrochemical multiple parameters in a corrosion process of a titanium-based material for a bipolar plate of a proton exchange membrane fuel cell, which is used for testing corrosion resistance and researching corrosion mechanism.
Background
The corrosion resistance of bipolar plates for proton exchange membrane fuel cells is mostly tested under the simulated working condition by adopting an electrochemical workstation, and common tests such as electrokinetic potential polarization, potentiostatic polarization, alternating current impedance and open circuit potential change along with time. In the literature reported so far, data measurement analysis of single type (potentiostatic polarization curve or single potentiostatic ac impedance analysis) or data measurement of double type (open circuit potential and ac impedance spectrum at open circuit potential) are common. Therefore, there is a need for improvement in joint test analysis of simultaneous acquisition of multiple types of data and quasi-simultaneous multiple types of data.
Disclosure of Invention
The invention aims to solve the defects of low data relevance of independent constant potential polarization and alternating current impedance under constant potential in the existing metal bipolar plate corrosion resistance test technology, and provides an electrochemical multi-parameter acquisition and joint analysis method for a titanium-based material corrosion process for a proton exchange membrane fuel cell.
The electrochemical multi-parameter acquisition and joint analysis method for the titanium-based material corrosion process of the bipolar plate is realized according to the following steps:
1. placing a titanium-based material for bipolar plate in a solution containing 0.0005mol/L H 2 SO 4 And 0.1ppmHF electrolyte solution, adopting an alternating current impedance measurement program of an electrochemical workstation to collect alternating current impedance spectrum under bias voltage, adopting a three-electrode system, taking a titanium-based material as a working electrode, wherein the alternating current impedance measurement program is that bias voltage alternating current impedance spectrum measurement and open circuit potential monitoring are alternately (jointly) carried out, each bias voltage impedance spectrum measurement is preceded by open circuit potential monitoring of 1800 seconds, and finally, the open circuit potential monitoring of 1800 seconds is ended;
2. in the bias ac impedance spectrum measurement process, the average current density value I of a single impedance data point is obtained through the potential and current relation (curve) of the impedance data point under a sine wave signal a The corrosion current density of the impedance data point;
3. in the process of measuring each bias alternating current impedance spectrum, calculating the effective corrosion current density in the test time of the bias alternating current impedance spectrum according to the corrosion current density of all the impedance data points, drawing a relation diagram of the effective corrosion current density and time in the measurement of all the bias alternating current impedance spectrum by taking the impedance spectrum acquisition time as an abscissa and the effective corrosion current density as an ordinate, and displaying abrupt change of the effective corrosion current density;
4. drawing a Nyquist diagram of a bias voltage alternating current impedance spectrum and an open circuit potential change diagram before alternating current impedance test respectively, and analyzing the corrosion electrochemical process of the titanium-based material for the bipolar plate through the change of the capacity arc resistance in the Nyquist diagram and the change of an open circuit potential curve through the mutation of effective corrosion current density;
wherein in the step one, bias voltage is controlled to be 0.6V in bias alternating current impedance spectrum measurement, the amplitude of an alternating current signal is 10-20 mV, and the frequency range of bias voltage alternating current is controlled to be 10 5 Hz～10 -2 Hz。
In the electrochemical multi-parameter acquisition and joint analysis method for the titanium-based material corrosion process for the bipolar plate, the first step is an electrochemical multi-parameter acquisition process, and the second to fourth steps are data processing and joint analysis processes.
The invention provides a method for testing corrosion performance of a titanium-based material for a bipolar plate, namely, the corrosion current density, bias impedance evolution and bias impedance intermittent open-circuit potential caused by bias are collected simultaneously, and the decay rule of the bipolar plate material in the service process can be revealed by comprehensively analyzing the evolution rule of the corrosion current density, the bias impedance and the open-circuit potential in the same time, so that the corrosion resistance of the titanium-based material in the service process can be evaluated more accurately.
Drawings
FIG. 1 is a schematic diagram of a combined measurement of bias AC impedance and open circuit potential in an embodiment;
FIG. 2 is a schematic diagram showing the relationship between the electric potential and the electric current corresponding to the sine wave when testing a single impedance data point in the embodiment;
FIG. 3 is a graph showing corrosion current density at each impedance point for monitoring the 10 th AC impedance spectrum under a bias of 0.6V in the example;
FIG. 4 is a graph showing the effective corrosion current density over time for AC impedance spectrum monitoring (1 st to 72 nd) at 0.6V bias in the example;
FIG. 5 is a plot of the time evolution of the 1 st to 14 th AC impedance spectra at 0.6V bias voltage, showing the number of AC impedance spectrum monitoring, for example, a represents the 1 st bias AC impedance spectrum measurement, and b represents the 3 rd bias AC impedance spectrum measurement;
FIG. 6 is a graph showing the time dependence of the 15 th-27 th AC impedance spectrum at 0.6V bias in the example;
FIG. 7 is a graph showing the time dependence of the 28 th to 35 th AC impedance spectra at 0.6V bias in the example;
FIG. 8 is a plot of the time dependence of the 36 th-46 th AC impedance spectrum at 0.6V bias in the example;
FIG. 9 is a graph showing the time dependence of the 48 th to 67 th AC impedance spectra at 0.6V bias in the example;
FIG. 10 is a graph showing the time dependence of 68-72 th AC impedance spectra at 0.6V bias in the example;
FIG. 11 is a graph showing the open circuit potential evolution over time before the 1 st to 14 th AC impedance spectroscopy measurements at a bias of 0.6V in the example, for example, a represents the 1 st open circuit potential monitor and b represents the 3 rd open circuit potential monitor;
FIG. 12 is a graph showing open circuit potential over time before the 15 th-27 th AC impedance spectroscopy measurement at a bias of 0.6V in the example;
FIG. 13 is a graph showing open circuit potential over time before measurement of the 28 th to 35 th AC impedance spectra at a bias of 0.6V in the example;
FIG. 14 is a plot of open circuit potential versus time prior to 36 th-46 th AC impedance spectroscopy measurements at a 0.6V bias in an example;
FIG. 15 is a graph showing open circuit potential over time before the 48 th to 67 th AC impedance spectroscopy measurements at a bias of 0.6V in the example;
FIG. 16 is a graph showing open circuit potential evolution over time before 68-73 AC impedance spectroscopy measurements at a bias of 0.6V in the examples.
Detailed Description
The first embodiment is as follows: the electrochemical multi-parameter acquisition and joint analysis method for the titanium-based material corrosion process of the bipolar plate of the embodiment is implemented according to the following steps:
1. placing a titanium-based material for bipolar plate in a solution containing 0.0005mol/L H 2 SO 4 And 0.1ppmHF electrolyte solution, adopting an alternating current impedance measurement program of an electrochemical workstation to collect alternating current impedance spectrum under bias voltage, adopting a three-electrode system, taking a titanium-based material as a working electrode, wherein the alternating current impedance measurement program is that bias voltage alternating current impedance spectrum measurement and open circuit potential monitoring are alternately (jointly) carried out, each bias voltage impedance spectrum measurement is preceded by open circuit potential monitoring of 1800 seconds, and finally, the open circuit potential monitoring of 1800 seconds is ended;
2. in the bias ac impedance spectrum measurement process, the average current density value I of a single impedance data point is obtained through the potential and current relation (curve) of the impedance data point under a sine wave signal a The corrosion current density of the impedance data point;
3. in the process of measuring each bias alternating current impedance spectrum, calculating the effective corrosion current density in the test time of the bias alternating current impedance spectrum according to the corrosion current density of all the impedance data points, drawing a relation diagram of the effective corrosion current density and time in the measurement of all the bias alternating current impedance spectrum by taking the impedance spectrum acquisition time as an abscissa and the effective corrosion current density as an ordinate, and displaying abrupt change of the effective corrosion current density;
4. drawing a Nyquist diagram of a bias voltage alternating current impedance spectrum and an open circuit potential change diagram before alternating current impedance test respectively, and analyzing the corrosion electrochemical process of the titanium-based material for the bipolar plate through the change of the capacity arc resistance in the Nyquist diagram and the change of an open circuit potential curve through the mutation of effective corrosion current density;
wherein in the step one, bias voltage is controlled to be 0.6V in bias alternating current impedance spectrum measurement, the amplitude of an alternating current signal is 10-20 mV, and the frequency range of bias voltage alternating current is controlled to be 10 5 Hz～10 -2 Hz。
The bias ac impedance spectrum measurement of this embodiment uses an ac sinusoidal potential wave of small amplitude, the frequency of which varies from large to small.
The second embodiment is as follows: the present embodiment is different from the specific embodiment in that the area of the titanium-based material for the bipolar plate in the first step is 1cm 2 。
And a third specific embodiment: this embodiment differs from the first or second embodiment in that the temperature of the electrolyte solution in the first step is 20 to 90 ℃.
The specific embodiment IV is as follows: the difference between the present embodiment and one to three embodiments is that the bias voltage is controlled to be 0.6V and the ac signal amplitude is 10mV in the first step.
Fifth embodiment: the difference between the embodiment and the embodiment is that the reference electrode in the three-electrode system in the step one is an Ag/AgCl electrode, and the counter electrode is a graphite plate.
Specific embodiment six: the difference between the present embodiment and one to fifth embodiments is that the bias ac impedance spectrum measurement and the open circuit potential monitoring in the ac impedance measurement procedure in the first step are each performed 70 to 80 times.
Seventh embodiment: the sixth embodiment is different from the first embodiment in that the ac impedance measurement procedure is performed for 72 bias ac impedance spectrum measurements and 73 open circuit potential monitoring.
Eighth embodiment: the difference between the present embodiment and one of the first to seventh embodiments is that the time for each bias ac impedance spectrum measurement in the first step is 1800 to 2500s.
Detailed description nine: this embodiment differs from the eighth embodiment in that the time for each bias ac impedance spectrum measurement in the first step is 2000s.
Detailed description ten: this embodiment differs from one of the first through ninth embodiments in that 71 impedance data points are set during each bias ac impedance spectrum measurement in step one.
Examples: the electrochemical multi-parameter acquisition and joint analysis method for the corrosion process of the titanium-based material for the bipolar plate is implemented according to the following steps:
1. placing a TC4 titanium alloy sample for a bipolar plate in an H containing 0.0005mol/L 2 SO 4 And an exposed area of 1cm in a 0.1ppm HF electrolyte solution 2 AC impedance spectrum acquisition under bias voltage is carried out by adopting an AC impedance measurement program of a Gamry electrochemical workstation, a three-electrode system is adopted, and electricity is operatedThe method is characterized in that a TC4 titanium alloy sample is adopted, a reference electrode is an Ag/AgCl electrode, a counter electrode is a graphite plate, an alternating current impedance measurement program is performed alternately (jointly) by bias alternating current impedance spectrum measurement and open circuit potential monitoring, the time of each section of bias alternating current impedance spectrum measurement is 2000s, open circuit potential monitoring is performed for 1800s before each section of bias alternating current impedance spectrum measurement, and finally, the open circuit potential monitoring is finished for 1800s, and in the embodiment, 72 bias impedance spectrum measurements are performed for 73 times;
2. in the bias ac impedance spectrum measurement process, the average current density value I of a single impedance data point is obtained through the potential and current relation (curve) of the impedance data point under a sine wave signal a The corrosion current density of the impedance data point;
3. in the process of measuring each bias alternating current impedance spectrum, calculating the effective corrosion current density in the test time of the bias alternating current impedance spectrum according to the corrosion current density of all the impedance data points, drawing a relation diagram of the effective corrosion current density and time in the measurement of all the bias alternating current impedance spectrum by taking the impedance spectrum acquisition time as an abscissa and the effective corrosion current density as an ordinate, and displaying abrupt change of the effective corrosion current density;
4. drawing a Nyquist diagram of a bias voltage alternating current impedance spectrum and an open circuit potential change diagram before alternating current impedance test respectively, and analyzing the corrosion electrochemical process of the titanium-based material for the bipolar plate through the change of the capacity arc resistance in the Nyquist diagram and the change of an open circuit potential curve through the mutation of effective corrosion current density;
wherein the parameters of the bias ac impedance spectroscopy measurement in step one are shown in table 1 below.
TABLE 1 bias ac impedance Spectrometry parameters
As shown in fig. 3, taking the impedance spectrum measured by the 10 th bias ac impedance spectrum as an example, fig. 2 is the corrosion current density corresponding to the impedance data point measured at bias 0.6V. The abscissa in FIG. 3 is after the beginning of acquisition of the impedance spectrum for this purposeRecording time of each impedance point data. The testing of impedance data is measured from high frequency to low frequency. As can be seen from the graph, the corrosion current density is high at the beginning of measuring the high-frequency impedance, and can reach 5×10 -4 A/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the The corrosion current density at the later measurement of low frequency impedance is as low as 1 x 10 -5 A/cm 2 。
The current density-time curve of fig. 3 is integrated over time to obtain the effective value of the corrosion current density for each impedance spectrum test time. The evolution of the effective corrosion current density obtained by monitoring the AC impedance spectrum under all 72 bias voltages along time (the time point when the acquisition of the impedance spectrum is completed) is shown as figure 4, and the effective corrosion current density is 4 multiplied by 10 when the TC4 titanium alloy is subjected to impedance test under the bias voltage of 0.6V -5 A/cm 2 Up to 4X 10 -4 A/cm 2 Between them. The effective corrosion current density curve is discontinuous, segmented into 6 segments, with the break points respectively in the light grey shaded areas as shown in fig. 4.
As shown in fig. 5-10, the alternating current impedance spectrum evolution is divided into 6 groups according to the 6-segment equivalent corrosion current density of fig. 4. The arc of the capacitive reactance in the Nyquist plots of the 1 st group impedance spectra 1 to 14 increases and then decreases, and the arc of the capacitive reactance in the Nyquist plots of the 2 nd group impedance spectra 15 to 27 decreases gradually; the capacitive arcs in Nyquist plots of group 3 impedance spectra 28 through 35 and group 4 impedance spectra 36 through 46 are progressively smaller, wherein the impedance spectra 28 and 36 are comparable in capacitive arc size, and the impedance spectra 35 and 46 are comparable in capacitive arc size; the size of the capacitive reactance arcs of the group 5 impedance spectrums 48 to 66 is in a decreasing trend as a whole, and finally the impedance spectrum 67 is slightly increased; the 6 th group impedance spectra 68 to 72 still have a decreasing trend.
The size of the capacitive reactance arc of each group of impedance is more in a descending trend, and the size of the first capacitive reactance arc of each group is similar. The dimensional change of the capacitive reactance arc is slowly reduced in each stage; the capacitive reactance arc size suddenly increases to a larger value when the next phase begins.
Comparing fig. 4 with fig. 5-10, it can be seen that the size of the capacitive reactance arc is inversely related to the effective current density.
Fig. 11-16 show the open circuit potential variation before ac impedance testing, again divided into six groups in sequence. In comparison with fig. 4, it was found that there was a sudden drop in open circuit potential before each mutation in the effective value of the equivalent corrosion current density. The open circuit potential 14 and the open circuit potential 24 have steep drops with the steep drop amplitude of 100mV at about 300 s; the open circuit potential 35 is steeply reduced by 600mV at about 900 s; the open circuit potential 46 had a steep drop precursor at 1800s, and the value after the steep drop could not be monitored because there was no longer a measurement; the open circuit potential 58 is also provided with a steep drop precursor, 9 curves from the open circuit potential 59 to the open circuit potential 67 are continuously provided with obvious steep drops, the steep drop amplitude is large, the drop amplitude reaches 600 millivolts, and the steep drop time points are sequentially advanced.
For metal corrosion, a drop in open circuit potential corresponds (generally) to a break in the surface film layer, and an increase in open circuit potential corresponds to passivation of the surface or formation of a protective film. And comprehensively comparing and analyzing the equivalent corrosion current density, the bias alternating current impedance spectrum and the evolution rule of the open circuit potential curve. In the service (under constant potential) process of the titanium alloy in the corrosive medium, the surface film layer can be destroyed, the sudden drop of the open circuit potential is shown, then the destruction point can be repaired to a certain extent by the constant potential polarization, and the open circuit potential is restored to a higher value. The open circuit voltage dips frequently occur in the impedances 58 to 67 and the steep drop time is earlier and earlier, which indicates that the constant voltage polarization is not completely repaired for the film layer at this stage. After the impedance 68, the coating again enters a normal passivation state without a steep drop in open circuit potential.
The invention utilizes the comprehensive analysis of the simultaneously collected multiple electrochemical parameters (corrosion current density under constant potential, alternating current impedance spectrum under constant potential and open circuit potential with intermittent impedance measurement) to effectively reveal the corrosion electrochemical process of the metal surface. Compared with the conventional electrochemical parameters which are respectively collected, the data has stronger correlation, the obtained conclusion is more accurate, the decay rule of the titanium-based material corrosion process is deeply revealed, and the corrosion resistance of the titanium-based material service process is accurately evaluated. The titanium-based material with good corrosion resistance has the advantages that the effective corrosion current density is low, the time for abrupt change can be delayed, the capacitive arc resistance is large, the change with time is not obvious, and the frequency of the abrupt drop of the open circuit potential is relatively low. Finally, the purpose of reasonably selecting the titanium-based material and the surface treatment process which meet the service environment of the fuel cell is achieved.
Claims (10)
1. The electrochemical multi-parameter acquisition and joint analysis method for the titanium-based material corrosion process for the bipolar plate is characterized by comprising the following steps of:
1. placing a titanium-based material for bipolar plate in a solution containing 0.0005mol/L H 2 SO 4 And 0.1ppmHF electrolyte solution, adopting an alternating current impedance measurement program of an electrochemical workstation to collect alternating current impedance spectrum under bias voltage, adopting a three-electrode system, taking a titanium-based material as a working electrode, wherein the alternating current impedance measurement program is formed by alternately carrying out bias voltage alternating current impedance spectrum measurement and open circuit potential monitoring, carrying out 1800s of open circuit potential monitoring before each bias voltage impedance spectrum measurement, and ending with 1800s of open circuit potential monitoring;
2. in the bias AC impedance spectrum measuring process, the average current density value I of a single impedance data point is obtained through the potential and current relation of the impedance data point under a sine wave signal a The corrosion current density of the impedance data point;
3. in the process of measuring each bias alternating current impedance spectrum, calculating the effective corrosion current density in the test time of the bias alternating current impedance spectrum according to the corrosion current density of all the impedance data points, drawing a relation diagram of the effective corrosion current density and time in the measurement of all the bias alternating current impedance spectrum by taking the impedance spectrum acquisition time as an abscissa and the effective corrosion current density as an ordinate, and displaying abrupt change of the effective corrosion current density;
4. drawing a Nyquist diagram of a bias voltage alternating current impedance spectrum and an open circuit potential change diagram before alternating current impedance test respectively, and analyzing the corrosion electrochemical process of the titanium-based material for the bipolar plate through the change of the capacity arc resistance in the Nyquist diagram and the change of an open circuit potential curve through the mutation of effective corrosion current density;
wherein in the step one, bias voltage is controlled to be 0.6V in bias alternating current impedance spectrum measurement, the amplitude of an alternating current signal is 10-20 mV, and the frequency range of bias voltage alternating current is controlled to be 10 5 Hz～10 -2 Hz。
2. The electrochemical multi-parameter acquisition and joint analysis method for titanium-based material for bipolar plate corrosion process according to claim 1, wherein the area of the titanium-based material for bipolar plate in the first step is 1cm 2 。
3. The electrochemical multiparameter acquisition and joint analysis method for a titanium-based material for bipolar plates according to claim 1, wherein the temperature of the electrolyte solution in the first step is 20-90 ℃.
4. The method for electrochemical multiparameter acquisition and joint analysis of a bipolar plate titanium-based material etching process according to claim 1, wherein in step one the bias voltage is controlled to be 0.6V and the ac signal amplitude is 10mV.
5. The electrochemical multi-parameter acquisition and joint analysis method for the corrosion process of the titanium-based material for the bipolar plate according to claim 1, wherein the reference electrode in the three-electrode system in the first step is an Ag/AgCl electrode, and the counter electrode is a graphite plate.
6. The electrochemical multi-parameter collection and joint analysis method for a titanium-based material corrosion process for bipolar plates according to claim 1, wherein the bias ac impedance spectrum measurement and the open circuit potential monitoring in the ac impedance measurement procedure in step one are each performed 70 to 80 times.
7. The method for electrochemical multiparameter acquisition and joint analysis of a bipolar plate titanium-based material etching process according to claim 6, wherein the ac impedance measurement procedure in step one is followed by a total of 72 biased ac impedance spectrum measurements and 73 open circuit potential monitoring.
8. The method for electrochemical multiparameter acquisition and joint analysis of a bipolar plate titanium-based material etching process according to claim 1, wherein the time for each measurement of the bias ac impedance spectrum in step one is 1800 to 2500s.
9. The method for electrochemical multiparameter acquisition and joint analysis of a bipolar plate titanium-based material etching process according to claim 8, wherein the time for each measurement of the bias ac impedance spectrum in step one is 2000s.
10. The method for electrochemical multiparameter acquisition and joint analysis of a bipolar plate titanium-based material etching process according to claim 1, wherein 71 impedance data points are set for each bias ac impedance spectrum measurement in step one.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117239182A (en) * | 2023-11-13 | 2023-12-15 | 中国科学院宁波材料技术与工程研究所 | Design method of corrosion-resistant metal fuel cell pile and pile structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117239182A (en) * | 2023-11-13 | 2023-12-15 | 中国科学院宁波材料技术与工程研究所 | Design method of corrosion-resistant metal fuel cell pile and pile structure |
| CN117239182B (en) * | 2023-11-13 | 2024-03-05 | 中国科学院宁波材料技术与工程研究所 | Design method of corrosion-resistant metal fuel cell pile and pile structure |
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