Device for testing corrosion performance of fuel cell polar plate material

Abstract

The utility model belongs to the technical field of electrochemical testing of fuel cell metal bipolar plate materials, and particularly relates to a device for testing the corrosion performance of a fuel cell polar plate material, a testing pool is communicated with a liquid storage pool, and a testing solution in the testing pool and a testing solution in the liquid storage pool are the same in component and liquid level height; an exhaust pipeline and an air inlet pipeline are respectively connected between the test pool and the liquid storage pool, a heating belt is wrapped on the air inlet pipeline, a condenser pipe is arranged on the exhaust pipeline, and a gas-liquid separator is further arranged on the exhaust pipeline; a reference electrode, a counter electrode, a temperature control thermocouple and a test sample clamp for clamping a test sample are respectively mounted on the test pool, and a gas inlet hole for introducing gas into the test device is formed in the liquid storage pool. According to the utility model, the liquid level of the test solution can be automatically adjusted and supplemented, so that the liquid level and components of the test solution in the corrosion performance test of the bipolar plate material of the fuel cell are kept stable, and the accuracy and experimental repeatability of a test evaluation method are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fuel cell metal bipolar plate material electrochemistry test technical field, specifically a kind of fuel cell polar plate material corrosion performance testing device. BACKGROUND

[0002] The main components of proton exchange membrane fuel cell include proton exchange membrane, electrode catalyst layer, electrode diffusion layer and bipolar plate etc. Among them, bipolar plate is an important component of proton exchange membrane fuel cell, and bipolar plate is an important component inside fuel cell stack. The main functions of bipolar plate include supporting membrane electrode, separating reaction gas, material distribution, collecting and conducting current, connecting battery cells etc. At the same time, bipolar plate occupies most of the volume, weight and production cost of stack, about 80% of the weight of the entire stack, about 90% of the volume and 40% of the cost of the entire stack. According to its function, bipolar plate should have good mechanical support, conductivity, corrosion resistance and air tightness. Compared with graphite material, metal material has good conductivity, thermal conductivity, mechanical stability, impact resistance and no porous structure, which is an ideal material for preparing fuel cell bipolar plate. Therefore, how to accurately and efficiently evaluate the corrosion resistance of metal material is an important problem in research. According to the requirements of bipolar plate corrosion test, it is necessary to simulate the actual operating conditions of fuel cell cathode, pass a certain flow of gas in simulated electrolyte solution and carry out constant potential durability test, and the continuous test time needs to be greater than 24 hours. During the constant potential test experiment of traditional corrosion performance test pool, the composition of electrolyte solution will be lost with gas flow, and the liquid level will drop, so it is necessary to constantly supplement electrolyte solution, which is not easy to control and cannot realize automatic continuous test. And the human control factor is large, which leads to large experimental result error and poor repeatability. UTILITY MODEL CONTENTS

[0003] In view of the problems of large experimental result error and unable to automatically control in current fuel cell polar plate metal material electrochemistry test, the utility model aims at providing a kind of fuel cell polar plate material corrosion performance testing device, so that the solution liquid level and solution composition in fuel cell bipolar plate material corrosion performance test remain stable, and the accuracy of test result and experimental repeatability are improved.

[0004] The utility model aims at realizing the following technical scheme:

[0005] The utility model discloses a test pool, liquid storage pool, exhaust pipeline and air inlet pipeline, wherein test pool and liquid storage pool are linked together, and the test solution in test pool and the test solution in liquid storage pool are same in composition and same in liquid level height, exhaust pipeline and air inlet pipeline are connected between test pool and liquid storage pool respectively, heating tape is wrapped on air inlet pipeline, condenser is provided on exhaust pipeline, and gas-liquid separator is further provided on exhaust pipeline, reference electrode, counter electrode, temperature control thermocouple and test sample clamp for clamping test sample are respectively installed on test pool, and air inlet hole for passing into gas into test device is formed on liquid storage pool.

[0006] The lower part of the test pool is communicated with the lower part of the liquid storage pool through a communicating pipe.

[0007] The air inlet hole and the communicating pipe are respectively located on the left and right sides of the height direction section of the liquid storage pool.

[0008] The two ends of the exhaust pipeline are respectively inserted into the top of the test pool and the top of the liquid storage pool, one end of the exhaust pipeline inserted into the test pool is located above the liquid level of the test solution in the test pool, and the other end of the exhaust pipeline inserted into the liquid storage pool is located below the liquid level of the test solution in the liquid storage pool.

[0009] The two ends of the air inlet pipeline are respectively inserted into the top of the test pool and the top of the liquid storage pool, and are respectively located above the liquid level of the test solution in the test pool and the test solution in the liquid storage pool.

[0010] The gas-liquid separator is located on the exhaust pipeline close to the liquid storage pool.

[0011] The air inlet hole is connected with the gas source through the air pipeline, and the air pipeline is respectively provided with a flow meter and a one-way valve that can only flow into the liquid storage pool.

[0012] The temperature control thermocouple is a temperature control point, and the heating temperature of the heating tape is higher than the temperature control point.

[0013] The test sample clamp, the reference electrode, the counter electrode and the temperature control thermocouple are all vertically installed on the test pool.

[0014] The air inlet hole is formed on the position close to the bottom of the liquid storage pool and is located below the liquid level of the test solution in the liquid storage pool.

[0015] The utility model has the advantages and positive effects that:

[0016] Compared with the traditional bipolar plate material corrosion performance test device, the test device of the utility model has the following beneficial effects:

[0017] 1. The conventional testing device needs to manually add solution to maintain the liquid level and the stability of the composition, and the testing device of the utility model does not need to manually adjust the solution liquid level and the composition, and does not need to invest manpower to supplement the solution.

[0018] 2. The conventional testing device needs to manually control the solution composition and the liquid level, and the composition and the adding frequency of the solution adding greatly influence the accuracy and consistency of the test result; the testing device of the utility model can realize the dynamic stability of the test solution liquid level and the composition by making the gas pass through the test solution into the testing device and then passing through the condensation reflux, and can improve the accuracy and consistency of the test result. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure schematic view of the utility model;

[0020] Figure 2 It is the result view of the utility model to three SS316 stainless steel material samples 24h constant potential 1.43V (vs.Ag / AgCl) air test;

[0021] Figure 3 It is the result view of the conventional testing device to three SS316 stainless steel material samples 24h constant potential 1.43V (vs.Ag / AgCl) air test;

[0022] Wherein: 1 is test cell, 2 is test solution, 3 is communication pipe, 4 is liquid pool, 5 is air inlet hole, 6 is test sample fixture, 7 is reference electrode, 8 is counter electrode, 9 is temperature control thermocouple, 10 is exhaust pipe, 11 is air inlet pipe, 12 is condenser, 13 is gas-liquid separator, 14 is heating belt. DETAILED DESCRIPTION

[0023] The utility model will be further described in detail in combination with the drawings.

[0024] As Figure 1 Indicated, the utility model includes test cell 1, liquid pool 4, exhaust pipe 10 and air inlet pipe 11, wherein test cell 1 is communicated with liquid pool 4, and the test solution 2 in test cell 1 and the test solution 2 in liquid pool 4 are same in composition and same in liquid level height;Test cell 1 and liquid pool 4 are connected with exhaust pipe 10 and air inlet pipe 11 respectively, and air inlet pipe 11 is wrapped with heating belt 14, and exhaust pipe 10 is provided with condenser 12, and exhaust pipe 10 is further provided with gas-liquid separator 13;Reference electrode 7, counter electrode 8, temperature control thermocouple 9 and test sample fixture 6 for clamping test sample are vertically installed on test cell 1, and air inlet hole 5 for passing into gas into the testing device is formed on liquid pool 4.

[0025] The lower part of the test pool 1 is communicated with the lower part of the storage pool 4 through the communication pipe 3. The two ends of the air inlet pipeline 11 are respectively inserted into the top of the test pool 1 and the top of the storage pool 4, and are respectively located above the liquid level of the test solution 2 in the test pool 1 and the test solution 2 in the storage pool 4. The two ends of the air outlet pipeline 10 are respectively inserted into the top of the test pool 1 and the top of the storage pool 4, and the end of the air outlet pipeline 10 inserted into the test pool 1 is located above the liquid level of the test solution 2 in the test pool 1, and the other end of the air outlet pipeline 10 inserted into the storage pool 4 is located below the liquid level of the test solution 2 in the storage pool 4.

[0026] The gas-liquid separator 13 of the embodiment is located on the air outlet pipeline 10 close to the storage pool 4.

[0027] The air inlet hole 5 of the embodiment is connected with the gas source through the air pipeline, and the air pipeline is respectively provided with a flow meter and a one-way valve which can only flow into the storage pool 4. The gas introduced into the storage pool 4 through the air inlet hole 5 of the embodiment can be nitrogen, hydrogen or air.

[0028] The air inlet hole 5 of the embodiment is arranged at a position close to the bottom of the storage pool 4 and is located below the liquid level of the test solution 2 in the storage pool 4, and preferably, the air inlet hole 5 is arranged at the same height as the communication pipe 3 and is respectively located on the left and right sides of the height direction section of the storage pool 4.

[0029] The temperature control thermocouple 9 of the embodiment is a temperature control point, and the heating temperature of the heating belt 14 is higher than the temperature control point.

[0030] The test pool 1 and the storage pool 4 of the utility model are communicated through the communication pipe 3, the components and the liquid level of the test solution 2 in the test pool 1 and the storage pool 4 are the same, the gas introduced through the air inlet hole 5 first passes through the test solution 2 in the storage pool 4 and then enters the test pool 1 through the air inlet pipeline 11, and the gas discharged from the test pool 1 returns to the storage pool 4 through the air outlet pipeline 10 and the gas-liquid separator 13, so that the dynamic balance of the components and the liquid level of the test solution 2 in the test pool 1 and the storage pool 4 can be maintained, automatic adjustment and liquid supplement can be realized, the consistency and accuracy of the constant potential test corrosion performance experiment can be improved, and the corrosion resistance of the bipolar plate material can be scientifically evaluated. The specific use method is as follows:

[0031] A. Install the test sample into the test sample clamp 6;

[0032] B. Prepare the test solution 2 according to the required proportion of the experiment and inject it into the test pool 1, and keep the set liquid level; the test solution 2 is a dilute sulfuric acid solution with PH = 3.

[0033] C. Connect the test sample clamp 6, the reference electrode 7 and the counter electrode 8 to the corresponding detection lines of the electrochemical workstation respectively;

[0034] D. Take the temperature control thermocouple 9 as the temperature control point, heat the test solution 2 to the required temperature through the water bath;

[0035] E. Heat the heating belt 14 to be higher than the temperature control point 5-10℃;

[0036] F. Pass the condenser tube 12 into the cooling water;

[0037] G. Set the type and flow of the gas passing through the flow meter, and pass it into the test device from the gas inlet hole 5;

[0038] H. Set the constant potential voltage of the electrochemical workstation, start the test and record the data.

[0039] During the test, the gas is passed into the reservoir 4 after being passed into the gas inlet hole 55, and then into the test cell 1 through the gas inlet pipeline 11. The gas in the test cell 1 is condensed through the condenser tube 12, and then passes through the gas-liquid separator 13, and the excess gas is discharged. The condensed liquid enters the reservoir 4, so that the liquid level and the composition of the solution can be relatively stable, and there is no need to supplement the solution additionally.

[0040] Taking the test of three SS316 stainless steel samples for 24 hours at a constant potential of 1.43V (vs. Ag / AgCl) and passing air as an example, Figure 2 is a test result graph of the test device using the utility model, Figure 3 is a test result graph of a traditional test device.

Claims

1. A device for testing the corrosion performance of a fuel cell bipolar plate material, characterized by: The test device comprises a test pool (1), a storage pool (4), an exhaust pipeline (10) and an air inlet pipeline (11), wherein the test pool (1) is communicated with the storage pool (4), the test solution (2) in the test pool (1) is the same in composition and the same in liquid level height with the test solution (2) in the storage pool (4); the exhaust pipeline (10) and the air inlet pipeline (11) are respectively connected between the test pool (1) and the storage pool (4), the air inlet pipeline (11) is wrapped with a heating belt (14), the exhaust pipeline (10) is provided with a condenser (12), and the exhaust pipeline (10) is further provided with a gas-liquid separator (13); the test pool (1) is respectively provided with a reference electrode (7), a counter electrode (8), a temperature control thermocouple (9) and a test sample clamp (6) for clamping a test sample, and the storage pool (4) is provided with an air inlet hole (5) for introducing gas into the test device.

2. The apparatus of claim 1, wherein: The lower part of the test pool (1) is communicated with the lower part of the storage pool (4) through a communication pipe (3).

3. The apparatus of claim 2, wherein: The air inlet hole (5) and the communication pipe (3) are respectively located on the left and right sides of the height direction section of the storage pool (4).

4. The apparatus of claim 1, wherein: The two ends of the exhaust pipeline (10) are respectively inserted into the top of the test pool (1) and the top of the storage pool (4), one end of the exhaust pipeline (10) inserted into the test pool (1) is located above the liquid level of the test solution (2) in the test pool (1), and the other end of the exhaust pipeline (10) inserted into the storage pool (4) is located below the liquid level of the test solution (2) in the storage pool (4).

5. The apparatus of claim 1, wherein: The two ends of the air inlet pipeline (11) are respectively inserted into the top of the test pool (1) and the top of the storage pool (4), and are respectively located above the liquid level of the test solution (2) in the test pool (1) and the test solution (2) in the storage pool (4).

6. The apparatus of claim 1, wherein: The gas-liquid separator (13) is located on the exhaust pipeline (10) close to the storage pool (4).

7. The apparatus of claim 1, wherein: The air inlet hole (5) is connected with a gas source through an air pipeline, and the air pipeline is respectively provided with a flow meter and a one-way valve which can only flow into the inside of the storage pool (4).

8. The apparatus of claim 1, wherein: The temperature control thermocouple (9) is a temperature control point, and the heating temperature of the heating belt (14) is higher than the temperature control point.

9. The apparatus of claim 1, wherein: The test sample clamp (6), the reference electrode (7), the counter electrode (8) and the temperature control thermocouple (9) are all vertically installed on the test pool (1).

10. The apparatus of claim 1, wherein: The air inlet hole (5) is arranged at a position close to the bottom of the storage pool (4) and below the liquid level of the test solution (2) in the storage pool (4).

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