CN219224664U - Three-electrode electrolytic cell device - Google Patents

Abstract

The utility model discloses a three-electrode electrolytic cell device, wherein a loading cavity is arranged in a sample loading module arranged on the top surface of a cell body, a testing window communicated with the loading cavity is arranged on the bottom surface of the sample loading module, and the bottom surface of a testing sample arranged in the loading cavity is tightly pressed and sealed on the testing window; a first electrode serving as a working electrode in the electrode module is arranged on the sample loading module and is contacted with the top surface of the test sample, a second electrode serving as an auxiliary electrode is arranged in the cell body and is positioned below the test window, and a third electrode serving as a reference electrode is arranged in the cell body and is positioned at one side of the first electrode; electrolyte injected from a liquid injection port at the top of the cell body submerges the exposed bottom surface of the test sample, the second electrode and the third electrode. The utility model can effectively solve the problem of sample seepage in the test, ensure the accuracy of the test result, reduce the cost waste caused by equipment damage, and can be suitable for various test area requirements for samples with different surface forms.

Description

Three-electrode electrolytic cell device

Technical Field

The utility model relates to the technical field of electrochemical testing, in particular to a three-electrode electrolytic cell device for testing corrosion resistance of a sample coating.

Background

Proton Exchange Membrane Fuel Cells (PEMFCs) can directly convert chemical energy into electric energy through electrochemical reaction, and have the advantages of low-temperature operating environment (70-90 ℃), high power density and zero pollutant emission, thus becoming one of the most promising power sources in transportation.

The bipolar plate is used as an important component of the proton exchange membrane fuel cell, not only can be used as an electrical connection between the fuel cells in the fuel cell stack, but also can be used for supplying reaction gas by utilizing a runner arranged on the surface of the bipolar plate and taking away heat and water generated by the reaction, thus being called as a framework of the fuel cell stack. In view of the importance degree of the bipolar plate and the severe factors of the working environment, it is important to research the corrosion resistance of the bipolar plate coating in order to ensure the operation efficiency and the service life of the galvanic pile.

At present, the corrosion resistance of the product coating is tested mainly by using a three-electrode system electrolytic cell. When in testing, the test sample is sealed by a rubber ring, and only the test surface is exposed; the test coupon was then placed near the bottom of the cell and immersed in the electrolyte for testing. For a test piece with a plane surface, the sealing mode for the test piece can generally achieve a better sealing effect. However, since the surface of the bipolar plate has a wavy flow channel structure, and the flow channel has a certain height, the flow channel is sealed by a rubber ring, and the problem of electrolyte leakage (seepage) is easy to occur due to the fact that the sealing is not in place in the testing process, the success rate of the testing is low, the requirements of consistency and repeatability of the corrosion resistance testing result of the bipolar plate coating are difficult to ensure, and the seepage in the testing process is easy to cause damage to testing equipment, so that the testing risk is high. Thus, existing cells are often only suitable for testing on samples with planar surfaces. In addition, in the existing test method, the test area of the sample is single, the effective test area is difficult to control through the size adjustment of the clamp, the temperature of the electrolyte is difficult to be ensured, and the like.

Disclosure of Invention

The utility model aims to overcome the defects in the prior art and provide a three-electrode electrolytic cell device.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

a three electrode electrolytic cell device comprising:

a cell body of the electrolytic cell;

the sample loading module is hermetically penetrated on the top surface of the tank body, a loading cavity is arranged in the sample loading module, a testing window communicated with the loading cavity is arranged on the bottom surface of the sample loading module, the loading cavity is used for placing a test sample, the test sample is tightly pressed and sealed on the testing window, and the bottom surface of the test sample is exposed in the tank body through the testing window;

the electrode module comprises a first electrode, a second electrode and a third electrode, the first electrode is arranged on the sample loading module and is in contact with the top surface of the test sample, the second electrode is arranged in the cell body and is positioned below the test window, and the third electrode is arranged in the cell body and is positioned at one side of the first electrode;

the first electrode is a working electrode, the second electrode is an auxiliary electrode, the third electrode is a reference electrode, a liquid injection port is arranged on the top of the tank body, electrolyte is injected through the liquid injection port, and the exposed bottom surface of the test sample, the second electrode and the third electrode are immersed.

Further, the sample loading module is provided with a first body and a second body, the first body is arranged on the top surface of the tank body in a penetrating mode, the loading cavity is formed in the top surface of the first body, the bottom surface of the first body is provided with a testing window communicated with the bottom surface of the loading cavity, a first sealing ring is arranged between the bottom surface of the testing sample and the bottom surface of the loading cavity, the second body enters the loading cavity from the top surface of the first body, the testing sample is tightly sealed on the testing window through the first sealing ring, the first electrode is arranged on the second body, and the second body is contacted with the top surface of the testing sample when the testing sample is tightly pressed.

Further, a first mounting opening is formed in the top surface of the tank body, the first body is mounted on the first mounting opening in a sealing mode and extends into the tank body, and the second body is connected with the first body in a rotating mode when entering the loading cavity.

Further, the first electrode comprises a first sub-electrode and a second sub-electrode, the first sub-electrode is elastically arranged in the second body in a penetrating manner and extends out of the bottom surface of the second body and is used for elastically contacting with the top surface of the test sample, the second sub-electrode is arranged in the second body in a penetrating manner and extends out of the top surface of the second body, and the first sub-electrode is electrically connected with the second sub-electrode.

Further, a second sealing ring is further arranged between the bottom surface of the second body and the top surface of the test sample, and when the second body enters the loading cavity, the second body is tightly pressed and sealed with the top surface of the test sample through the second sealing ring.

Further, a second mounting opening is formed in the side face of the tank body, the second electrode is mounted on the second mounting opening in a sealing mode and is parallel to the bottom face of the test sample, and the projection of the second electrode in the vertical direction completely covers the test window.

Further, a third mounting port is formed in the top of the tank body, a temperature detection module is mounted on the third mounting port in a sealing mode, the height of the third mounting port is higher than that of the bottom surface of the test sample, and the third mounting port is the liquid injection port.

Further, the third mounting port is also provided with an air guide module in a sealing manner.

Further, a fourth mounting port is formed in the top of the tank body, the third electrode is mounted on the fourth mounting port in a sealing mode, the third electrode is parallel to the first electrode, the height of the fourth mounting port is higher than the bottom surface height of the test sample, and the fourth mounting port is the liquid injection port.

Further, the tank body is arranged in the circulating water bath.

According to the technical scheme, the novel sample loading module is designed, the test sample can be compressed, effective sealing is achieved, and the test sample is arranged above the electrolytic cell body, so that the electrolyte is fully contacted with the bottom surface of the test sample during testing, the liquid pressure of the electrolyte on the test sample can be reduced, the problem of seepage of the test sample in the testing process can be effectively solved, the accuracy of a test result is guaranteed, the success rate and the repeatability of the test are improved, and cost waste caused by equipment damage due to seepage is prevented. And moreover, by arranging the test window on the sample loading module with the combined structure, not only can the test area be accurately controlled, but also the sample loading module with different sizes of test windows can be formed by simple assembly according to the test requirement, so that the test window is suitable for various test area requirements of different test samples. In addition, through adopting the external circulation water bath to carry out comprehensive cladding to the bottom and the side of electrolytic cell body, be favorable to the temperature of the electrolyte in the accurate control cell body, further improve the accuracy of test.

Drawings

FIGS. 1-2 are schematic views showing a three-electrode electrolytic cell device according to a preferred embodiment of the present utility model;

fig. 3 is an exploded view of a sample loading module according to a preferred embodiment of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. Unless otherwise defined, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this utility model belongs. As used herein, the word "comprising" and the like means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof without precluding other elements or items.

The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings.

Referring to fig. 1-2, fig. 1-2 are schematic views of a three-electrode electrolytic cell device according to a preferred embodiment of the utility model. As shown in fig. 1 to 2, a three-electrode electrolytic cell device of the present utility model comprises: the electrolytic cell body 4, the sample loading module 15, the electrode module and the like.

Please refer to fig. 1-2. The electrolytic cell is provided with a cell body 4. The cell body 4 is of a closed structure and is used for injecting electrolyte 5 for electrochemical testing.

The sample loading module 15 is used for sealing mounting a test sample 31 (refer to fig. 3) for electrochemical testing. The sample loading module 15 is provided on the top surface of the cell body 4 such that the bottom surface of the test sample 31 mounted in the sample loading module 15, i.e., the test surface of the test sample 31, is exposed downward in the cell body 4, so that the bottom surface of the test sample 31 can be brought into full contact with the electrolyte 5 injected in the cell body 4, i.e., the bottom surface of the test sample 31 is located below the liquid level of the electrolyte 5.

The sample loading module 15 is provided with a loading chamber 28 (refer to fig. 3); a test window 27 is provided on the bottom surface of the sample loading module 15 in communication with a loading chamber 28. The loading chamber 28 is used for placing the test sample 31, and the test sample 31 is pressed in the loading chamber 28, so that the test sample 31 is pressed and sealed on the test window 27, and the bottom surface of the test sample 31 is exposed from the test window 27. Thus, the exposed bottom surface of the test sample 31 passes through the test window 27 and comes into full contact with the electrolyte 5 injected into the cell body 4.

The electrode module comprises a first electrode 12, a second electrode 26 and a third electrode 7. Wherein the first electrode 12 is disposed on the sample loading module 15 and is located outside the cell body 4. The lower end of the first electrode 12 protrudes into the loading chamber 28, contacting the top surface of the test sample 31 enclosed in the loading chamber 28. A second electrode 26 is provided in the cell body 4 below the test window 27 and immersed in the electrolyte 5. The third electrode 7 is provided in the cell body 4 and is provided on one side of the first electrode 12.

The first electrode 12 is used as a working electrode during testing, the second electrode 26 is used as an auxiliary electrode, and the third electrode 7 is used as a reference electrode.

The top of the cell body 4 is provided with a liquid injection port, and electrolyte 5 in the cell body 4 is injected through the liquid injection port to submerge the exposed bottom surface of the test sample 31, the second electrode 26 and the third electrode 7.

The present utility model can be used for electrochemical testing of a test sample 31, for example, in the form of a plate (sheet). The test sample 31 may be, for example, a flat plate, an etched plate, or a curved plate such as a metal bipolar plate of a proton exchange membrane fuel cell, or the like. The utility model can test the corrosion resistance of the surface coating of the test sample 31. But is not limited thereto.

Please refer to fig. 1-3. In some embodiments, the sample loading module 15 may be provided with a first body 14 and a second body 13. Wherein, the first body 14 is arranged on the top surface of the tank body 4 in a penetrating way. The loading chamber 28 is disposed on the top surface of the first body 14, and the test window 27 is disposed on the bottom surface of the first body 14 and communicates with the bottom surface of the loading chamber 28.

When placing the test sample 31 in the loading chamber 28, a first sealing ring 32 is placed between the bottom surface of the test sample 31 and the bottom surface of the loading chamber 28. The opening size of the first seal 32 may generally correspond to the size of the test window 27 such that the first seal 32 can be positioned on the bottom surface of the loading chamber 28 and around the test window 27. The second body 13 can enter the loading cavity 28 from the top surface of the first body 14 to tightly press the test sample 31, so that the test sample 31 is pressed on the bottom surface of the loading cavity 28, and the test sample 31 can be sealed on the test window 27 through the first sealing ring 32, only a part of the bottom surface of the test sample 31 in the test window 27 is exposed and used as a test surface to be contacted with the electrolyte 5 injected in the cell body 4 to receive a test.

The surface of bipolar plate usually has the runner structure that is wavy, and the runner has certain height, and is sealed through the rubber circle alone, and electrolyte seepage (seepage) problem takes place easily because of sealed not in place in the test process, leads to the test success rate lower, is difficult to guarantee bipolar plate coating corrosion resistance test result's uniformity and repeatability requirement, and the seepage in the test process easily causes the damage phenomenon to test equipment, therefore has higher test risk. The novel sample loading module 15 designed by the utility model can effectively seal special test samples 31 such as bipolar plates and the like. Through setting up first sealing washer 32 between the bottom surface of test sample 31 and the bottom surface of loading chamber 28 to through compressing tightly test sample 31, can make first sealing washer 32 receive when the extrusion takes place deformation, its material can get into in the rugged runner structure in bipolar plate surface and carry out abundant filling, blocks the runner structure, thereby prevented electrolyte 5 through exposing in the bottom surface of test sample 31 of test window 27 and runner structure, infiltration is on the top surface of bipolar plate test sample 31, causes the risk of test failure.

Meanwhile, the liquid pressure of the electrolyte 5 on the test sample 31 can be greatly reduced by arranging the test sample 31 above the cell body 4, so that the problem of liquid seepage of the past test sample 31 in the test process can be effectively solved.

Please refer to fig. 1-3. In some embodiments, the first electrode 12 may be disposed on the second body 13 and exposed on the bottom surface of the second body 13, so as to contact the top surface of the test sample 31 when the second body 13 enters the loading cavity 28 of the first body 14 and compresses the test sample 31.

In some embodiments, the first electrode 12 may include a first sub-electrode 122 and a second sub-electrode 121. The first sub-electrode 122 is elastically disposed in the second body 13 and extends from the bottom surface of the second body 13, so as to elastically contact with the top surface of the test sample 31 when the second body 13 enters the loading cavity 28 of the first body 14 and compresses the test sample 31. The second sub-electrode 121 is disposed in the second body 13 in a penetrating manner and protrudes from the top surface of the second body 13 so as to be connected with an electrode clip of an electrochemical workstation. The first sub-electrode 122 and the second sub-electrode 121 are electrically connected.

In some embodiments, a first counterbore may be provided on the bottom surface of the second body 13, in which the first sub-electrode 122 is provided. An elastic element may be disposed between the bottom end of the first counterbore and the first sub-electrode 122. A second counter bore may be provided on the top surface of the second body 13, and the second sub-electrode 121 is provided in the second counter bore. The first counter bore and the second counter bore can be connected through a channel arranged in the second body 13, and the first sub-electrode 122 and the second sub-electrode 121 can be electrically connected through a wire arranged in the channel.

In some embodiments, a second sealing ring 30 may also be provided between the bottom surface of the second body 13 and the top surface of the test specimen 31. When the second body 13 enters the loading chamber 28, it can be pressed and sealed with the top surface of the test sample 31 by the second sealing ring 30. By arranging the second sealing ring 30, on one hand, the damage to the test sample 31 or the second body 13 can be avoided when the test sample 31 is pressed in the loading cavity 28; on the other hand, a second seal line may be provided, and once the first seal 32 fails, the second seal 30 may be used to continue to prevent electrolyte 5 from penetrating onto the top surface of the test sample 31.

In some embodiments, the first seal ring 32 and the second seal ring 30 may form a clearance fit with the sidewall of the loading chamber 28 when horizontally placed in the loading chamber 28, and may expand against the sidewall of the loading chamber 28 by deformation when pressed by the second body 13, thereby further enhancing the sealing effect.

In some embodiments, the test sample 31 may be machined to have a profile that forms a clearance fit with the side walls of the loading chamber 28.

In some embodiments, the top surface of the tank body 4 may be provided with a first mounting opening 11, and the first body 14 may be mounted on the first mounting opening 11 in a sealing manner and extend into the tank body 4.

In some embodiments, the second body 13 may form a rotational connection with the first body 14 upon entry into the loading chamber 28.

Please refer to fig. 3. In some embodiments, the first body 14 may take on a first necked flange-like configuration. The first necked flange-like structure may include a first flange portion 141 and a first flange neck portion 142 connected. Wherein the loading chamber 28 may sequentially enter the first flange portion 141 and the first flange neck portion 142 from an end surface (illustrated as a left end surface) of the first flange portion 141; the test window 27 is provided on an end face (shown as a right-hand end face) of the first flange neck 142 and into the first flange neck 142 in communication with the bottom surface of the loading chamber 28. The first body 14 can be introduced into the first mounting opening 11 via the first flange neck 142 and can be screwed into the first mounting opening 11.

In some embodiments, a third sealing ring may be disposed on the interface between the first flange neck 142 and the first flange portion 141, for sealing the first body 14 to the first mounting port 11, so as to prevent the electrolyte 5 in the cell body 4 from overflowing from the first mounting port 11.

In some embodiments, the second body 13 may take the form of a second necked flange-like structure. The second necked flange-like structure may include a connected second flange portion 131 and second flange neck portion 132. Wherein a first counterbore may be provided on the end face (shown as the right end face) of the second flange neck 132 and a first sub-electrode 122 is provided in the first counterbore. An elastic element may be disposed between the bottom end of the first counterbore and the first sub-electrode 122. The first sub-electrode 122 can be pushed to be partially exposed out of the surface of the first counter bore by releasing the elastic force of the elastic element. A second counterbore may be provided on the end face (left end face as shown) of the second flange portion 131 and a second sub-electrode 121 is provided in the second counterbore. The first counter bore and the second counter bore can be connected through channels arranged in the second flange plate part 131 and the second flange neck part 132, wires can be arranged in the channels, and two ends of the wires can pass through the channels and are respectively electrically connected with the first sub-electrode 122 positioned in the first counter bore and the second sub-electrode 121 positioned in the second counter bore. The second body 13 can be introduced into the loading chamber 28 on the first body 14 via the second flange neck 132 and can be connected in a rotatable manner to the first body 14 via a threaded connection.

Thus, when the second body 13 is rotated into the loading chamber 28 of the first body 14 by the second flange neck 132, a good seal is established between the bottom surface (shown as the right side) of the test specimen 31 and the test window 27 of the first body 14, and between the top surface (shown as the left side) of the test specimen 31 and the second body 13 by continuing to rotate and by deformation of the first seal ring 32 and the second seal ring 30, gradually compressing the surface of the test specimen 31. In this process, the first sub-electrode 122 exposed on the second flange neck 132 gradually contacts the top surface of the test sample 31, and is gradually retracted into the first counterbore by the pressing force of the test sample 31, so that the elastic element is pressed to contract. When the second body 13 rotates in place, the elastic force applied to the first sub-electrode 122 by the elastic element can ensure that the first sub-electrode 122 is in effective elastic contact with the top surface of the test sample 31.

In some embodiments, the second flange portion 131 and the second flange neck portion 132 may be of a split structure and may be assembled to form the unitary second body 13 to facilitate the processing of channels and routing of wires thereon and to facilitate the connection of wires with the first sub-electrode 122 and the second sub-electrode 121.

In some embodiments, anti-slip patterns 33 may be provided on the outer circumferences of the first and second flange parts 141 and 131 to facilitate the holding of the outer circumferences of the first and second flange parts 141 and 131, respectively, for the mounting and fastening of the test sample 31. The mounting and fastening state of the test specimen 31 can be quantitatively detected by using a measuring tool such as a torque wrench, and the rotation in place indication can be marked on the first body 14 and the second body 13.

The size of the test window 27 can determine the test area of the test sample 31. Thus, a diversified adjustment of the sample test area can be achieved by changing the processing size of the test window 27 on the first body 14. Further, a plurality of first bodies 14 matched with the second bodies 13 can be utilized, and test windows 27 with different sizes can be processed on each first body 14, so that the first body 14 with the corresponding size of the test window 27 can be selected to be matched with the second body 13 for mounting the test sample 31 according to test requirements.

In some embodiments, the test sample 31 may be in the shape of a disc, and the first seal 32 and the second seal 30 may be in the shape of a ring, as shown in fig. 3. After the test sample 31 is mounted on the sample loading module 15, it is horizontally placed above the cell body 4 so that the exposed bottom surface of the test sample 31 is parallel or substantially parallel to the liquid surface of the electrolyte 5.

In some embodiments, the test sample 31, the first seal 32, and the second seal 30 may also be polygonal, shaped, or the like.

In some embodiments, the test window 27 may be a circular window.

In some embodiments, the test window 27 may also be a polygonal window, a shaped window, or the like.

In some embodiments, the first sub-electrode 122 and the second sub-electrode 121 may be conductive probes or the like.

In some embodiments, the resilient element may be a spring or the like.

Please refer to fig. 1-2. In some embodiments, the side of the tank body 4 may be provided with a second mounting opening 23; the second electrode 26 can be mounted on the second mounting opening 23 through the first sealing cover 24 in a sealing manner, and the surface of the second electrode 26 is parallel to the bottom surface of the test sample 31, so that the mounted second electrode 26 is horizontally suspended in the cell body 4.

The second electrode 26 may be led out through the first seal cap 24 for connection with an electrode clamp of an electrochemical workstation.

In some embodiments, the second electrode 26 may be tightly mounted on the first sealing cover 24 by a first fastening screw 25; the first sealing cover 24 and the second mounting opening 23 can be connected by screw threads, and sealing can be realized by a fourth sealing ring.

In some embodiments, the second electrode 26 may be rectangular, circular, etc.

In some embodiments, the projection of the second electrode 26 in place in the vertical direction may completely cover the test window 27 (refer to fig. 2).

In some embodiments, a third mounting port 19 may be provided on the top of the cell body 4. For example, the third mounting port 19 may be provided on the top surface of the cell body 4. And, the third mounting port 19 is higher in height than the bottom surface of the test sample 31 in the sample loading module 15 mounted on the first mounting port 11.

In some embodiments, a temperature detection module may be sealably mounted on the third mounting port 19 for monitoring the temperature change of the electrolyte 5 during the test process so as to control the temperature of the electrolyte 5.

In some embodiments, the temperature detection module may be a temperature sensor, or may be a thermometer 21 or the like.

In some embodiments, the thermometer 21 may be sealingly mounted to the third mounting port 19 by the second sealing cap 18.

In some embodiments, the thermometer 21 may be tightly mounted on the second sealing cover 18 by the second fastening screw 16; the second sealing cover 18 and the third mounting opening 19 can be connected by screw threads, and sealing can be realized by a fifth sealing ring.

In some embodiments, the third mounting port 19 may also have an air guide module sealingly mounted thereon. The air guide module can comprise an air inlet air pipe and an air outlet air pipe. The gas can be introduced into the cell body 4 through the gas inlet pipe, and the gas generated in the cell body 4 is discharged through the gas outlet pipe, so that the conditions of testing the surface coating (such as the surface coating of the bipolar plate) of the test sample 31 under different atmospheres can be met.

In some embodiments, the inlet and outlet air pipes may be tightly mounted on the second sealing cover 18 by the third and fourth fastening screws 17 and 29, respectively.

In some embodiments, the first mounting port 11 may be provided directly on the top surface of the cell body 4. And, a vertical pipe 20 connected with the tank body 4 is formed upward on the top surface of the tank body 4, and the upper opening of the vertical pipe 20 is used as a third mounting port 19, so that the height position of the third mounting port 19 is higher than that of the first mounting port 11, and the height position of the third mounting port 19 is higher than that of the bottom surface of the test sample 31 in the sample loading module 15 mounted on the first mounting port 11.

In some embodiments, a fourth mounting port 8 may be further provided on the top of the cell body 4, and a third electrode 7 may be hermetically mounted on the fourth mounting port 8. The third electrode 7 can be used as a reference electrode.

In some embodiments, the fourth mounting port 8 is higher in height than the bottom surface of the test sample 31 in the sample loading module 15 mounted on the first mounting port 11.

In some embodiments, a bent pipe 6 connected to the cell body 4 may be formed on the side of the cell body 4 near the top surface at the top of the cell body 4, and the opening of the bent pipe 6 is disposed upward as the fourth mounting port 8 such that the fourth mounting port 8 is formed at a height higher than the bottom surface of the test sample 31 in the sample loading module 15 mounted on the first mounting port 11. The elbow 6 is used as a reference electrode placing tube, the elbow 6 can be provided with a horizontal tube section and a vertical tube section which are connected, and the third electrode 7 can be mounted on the fourth mounting port 8 in a sealing way through the third sealing cover 9 and is positioned in the vertical tube section of the elbow 6, as shown in fig. 1.

In other embodiments, the fourth mounting port 8 may also be provided directly on the top surface of the cell body 4. The height of the fourth mounting port 8 is made higher than the height of the first mounting port 11 by forming a straight pipe connected to the cell body 4 upward on the top surface of the cell body 4 with the upper opening of the straight pipe as the fourth mounting port 8, so that the height of the fourth mounting port 8 is made higher than the bottom surface of the test sample 31 in the sample loading module 15 mounted on the first mounting port 11. The third electrode 7 may be sealingly mounted in a straight tube.

The standpipe 20 and the elbow 6 (or straight tube) communicate with the tank body 4 and thus also form part of the tank body 4.

In some embodiments, the third electrode 7 may be tightly mounted on the third sealing cap 9 by a fifth fastening screw 10; the third sealing cover 9 and the fourth mounting opening 8 can be connected by adopting threads, and sealing can be realized by a sixth sealing ring.

The third electrode 7 can be led out through a third sealing cap 9 for connection with an electrode clamp of an electrochemical workstation.

In some embodiments, the third electrode 7 may be disposed parallel to the first electrode 12, and the third electrode 7 may be disposed perpendicular to the second electrode 26, i.e., the first electrode 12 may be disposed perpendicular to the second electrode 26.

In some embodiments, the third electrode 7 may be disposed as close as possible to the test sample 31 to further improve the test accuracy.

In some embodiments, the third electrode 7 may be a cylindrical electrode or the like.

In some embodiments, the fourth mounting port 8 and the third mounting port 19 may be separately arranged on two sides of the first mounting port 11, and a U-shaped pipe structure with the fourth mounting port 8 and the third mounting port 19 being opened at the upper side is formed by the elbow pipe 6 and the standpipe 20 connected with the tank body 4, and the U-shaped pipe structure is communicated with the bottom surface of the test sample 31 mounted thereon through the first mounting port 11.

In some embodiments, the first sub-electrode 122 may be disposed at a central position of the second body 13, and the second sub-electrode 121 may be disposed at a position near an edge of the second body 13.

In some embodiments, the axis of the third electrode 7 and the axis of the second sub-electrode 121, the axis of the first sub-electrode 122, and the center of the second electrode 26 may be in the same vertical plane, as shown in fig. 2.

In some embodiments, one of the third mounting port 19 and the fourth mounting port 8 may be reused as a fill port for the electrolyte 5. When the electrolyte 5 is injected into the cell body 4 through the third mounting port 19 or the fourth mounting port 8, the liquid level of the electrolyte 5 can be observed by using the U-shaped pipe structure formed between the third mounting port 19 and the fourth mounting port 8, so that the liquid level of the electrolyte 5 injected into the cell body 4 can be conveniently controlled to be higher than the bottom surface of the test sample 31, and the exposed bottom surface of the test sample 31 on the test window 27 can be ensured to be in full contact with the electrolyte 5, and the electrolyte 5 cannot be excessively deeply immersed in the electrolyte 5 so as to generate excessive liquid pressure on the bottom surface of the test sample 31.

Separate liquid injection ports may be provided at positions of the tank body 4 other than the third mounting port 19 and the fourth mounting port 8.

In some embodiments, the first to sixth sealing rings 32 to sixth sealing rings may be rubber sealing rings or the like.

In some embodiments, the cell body 4 may be a plexiglass cell body 4 or the like. The elbow pipe 6 provided with the third mounting port 19 and the standpipe 20 provided with the fourth mounting port 8 may be organic glass pipes or the like made of the same material as the cell body 4, and may be formed integrally with the cell body 4 by processing.

In some embodiments, the cell body 4 may be a circular cell body 4, as shown in fig. 2; alternatively, the cell body 4 may be a polygonal cell body 4 or the like.

In some embodiments, the materials of the first body 14 and the second body 13 of the sample loading module 15, and the materials of the first sealing cover 24 to the third sealing cover 9 may be polytetrafluoroethylene, etc.

Please refer to fig. 1-2. In some embodiments, the tank 4 may be disposed in the circulating water bath 2. The circulating water bath 2 can be filled with circulating water 3 with a certain temperature, and is used for heating the electrolyte 5 in the cell body 4 and controlling the temperature of the electrolyte 5 to be kept within a required test temperature range.

In some embodiments, the circulating water bath 2 may be shaped corresponding to the tank body 4, so as to perform full contact coating on the bottom and the side surface of the tank body 4, thereby improving heating uniformity. Further, the top surface of the circulating water bath 2 may be flush with or close to the top surface of the tank body 4, and at least the horizontal pipe section of the elbow 6 is covered.

In some embodiments, the circulating water bath 2 may be provided with a water inlet 1 and a water outlet 22. Wherein the water inlet 1 can be arranged on the side of the circulating water bath 2 near the bottom, and the water outlet 22 can be arranged on the side of the circulating water bath 2 near the top. Further, the water inlet 1 and the water outlet 22 may be separately provided on opposite sides of the circulation water bath 2 to enhance the water bath circulation effect.

In some embodiments, the circulating water bath 2 may employ a plexiglass cell or the like. Further, the circulating water bath 2 can be integrally formed with the tank body 4.

For example, PEMFC fuel cells typically operate at temperatures of 70-90 ℃. When testing a bipolar plate of a PEMFC fuel cell, certain temperature conditions are required in the corrosion resistance testing process of the bipolar plate coating in order to accurately reflect the corrosion resistance of the bipolar plate surface coating in a specific temperature environment. External circulating water heated to 70-90 ℃ correspondingly is led into the circulating water bath 2 through the water inlet 1 and flows out and is recycled through the water outlet 22, so that the water in the circulating water bath 2 circularly flows, and the temperature of the electrolyte 5 in the cell body 4 can be effectively controlled. Meanwhile, in order to monitor the temperature change of the electrolyte 5 during the test, a thermometer 21 may be installed on the third installation port 19 for temperature detection. In addition, the third mounting port 19 can be provided with an air inlet air pipe and an air outlet air pipe at the same time, so that the bipolar plate coating can be tested under different atmospheres.

In use of the utility model, the sample loading module 15 is first selected to have a test window 27 of a desired size, and the first seal 32 is placed into the loading cavity 28 on the first body 14 of the sample loading module 15 and laid flat on the bottom surface of the loading cavity 28 around the test window 27. Then, the test specimen 31 is placed in the loading chamber 28, and the bottom surface of the test specimen 31 is fitted with the first seal ring 32. The second seal 30 is then placed over the test specimen 31. Next, the second body 13 is gradually screwed into the loading chamber 28, forming a connection with the first body 14, and ensuring that elastic contact is made between the first sub-electrode 122 of the first electrode 12 and the top surface of the test sample 31, thereby forming a working electrode for testing. Next, the first body 14 provided with the second body 13 is sealingly mounted on the first mounting port 11 of the cell body 4 in a screw form such that the first electrode 12 as a working electrode is located outside the cell body 4. Then, the second electrode 26 as an auxiliary electrode is attached to the second mounting opening 23 on the side surface of the cell body 4 through the first sealing cover 24 such that the second electrode 26 is positioned below the first electrode 12 and parallel to the bottom surface of the test sample 31 exposed to the test window 27.

After the test sample 31, the first electrode 12 and the second electrode 26 are mounted, the electrolyte 5 can be injected into the transparent cell body 4 from the third mounting port 19 formed in the vertical tube 20 on the top surface of the cell body 4, and the electrolyte 5 can be added to a position at least above the first mounting port 11 by observing that the liquid level of the electrolyte 5 in the vertical tube 20 below the third mounting port 19 is higher than the bottom surface of the test sample 31. The purpose of this is mainly to ensure that the bottom surface of the test specimen 31 is in sufficient contact with the electrolyte 5 during testing and the design of the structure is advantageous for reducing the risk of liquid penetration during testing for e.g. bipolar plates.

When the liquid surface of the injected electrolyte 5 reaches a certain height difference from the bottom surface of the test sample 31, the second sealing cover 18 provided with the thermometer 21 can be mounted and connected to the third mounting opening 19 in a threaded manner, and the measuring end of the lower end of the thermometer 21 can be positioned at a height position close to the bottom surface of the test sample 31.

Then, the third electrode 7 serving as a reference electrode can be installed and connected on the fourth installation opening 8 above the bent pipe 6 which is communicated with the cell body 4 and serves as a reference electrode placing pipe through the third sealing cover 9, and the third electrode 7 serving as the reference electrode is close to the first electrode 12 serving as a working electrode, so that the influence of ohmic drop of the solution of the electrolyte 5 on a test result is reduced.

Finally, the first electrode 12 (second sub-electrode 121) to the third electrode 7 are connected to the three electrode clamps of the electrochemical workstation, respectively, so that the test for corrosion resistance of the surface coating of the bipolar plate, for example, can be started, and the data during the test can be recorded.

In summary, the utility model has the following advantages:

(1) By changing the structure of the electrolytic cell, the test sample 31 is positioned above the electrolytic cell, the liquid pressure acting on the sample can be reduced, and by optimizing the liquid level height difference of the electrolyte 5 in the electrolytic cell at the first mounting port 11 and the third mounting port 19, the electrolyte 5 is fully contacted with the test sample 31 during the test, the accuracy of the test result is ensured, meanwhile, the seepage risk in the corrosion-resistant test process of the coating such as a bipolar plate can be reduced, and the success rate and the repeatability of the test are improved;

(2) Damage of seepage to test equipment can be avoided, and test cost is reduced;

(3) The test device can be suitable for various test area requirements for different samples;

(4) The outside of the electrolytic cell is coated by a circulating water bath 2, which is beneficial to better controlling the temperature of the electrolyte 5 in the electrolytic cell.

The utility model can be widely applied to more accurate electrochemical tests of products with different surface forms, such as flat plates, etching plates, curved plates and the like, including bipolar plates, and is suitable for popularization.

While embodiments of the present utility model have been described in detail hereinabove, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. It is to be understood that such modifications and variations are within the scope and spirit of the present utility model as set forth in the following claims. Moreover, the utility model described herein is capable of other embodiments and of being practiced or of being carried out in various ways.

Claims (10)

1. A three electrode electrolytic cell apparatus comprising:

a cell body of the electrolytic cell;

the sample loading module is hermetically penetrated on the top surface of the tank body, a loading cavity is arranged in the sample loading module, a testing window communicated with the loading cavity is arranged on the bottom surface of the sample loading module, the loading cavity is used for placing a test sample, the test sample is tightly pressed and sealed on the testing window, and the bottom surface of the test sample is exposed in the tank body through the testing window;

the electrode module comprises a first electrode, a second electrode and a third electrode, the first electrode is arranged on the sample loading module and is in contact with the top surface of the test sample, the second electrode is arranged in the cell body and is positioned below the test window, and the third electrode is arranged in the cell body and is positioned at one side of the first electrode;

the first electrode is a working electrode, the second electrode is an auxiliary electrode, the third electrode is a reference electrode, a liquid injection port is arranged on the top of the tank body, electrolyte is injected through the liquid injection port, and the exposed bottom surface of the test sample, the second electrode and the third electrode are immersed.

2. The three-electrode electrolytic cell device according to claim 1, wherein the sample loading module is provided with a first body and a second body, the first body is arranged on the top surface of the cell body in a penetrating manner, the loading cavity is arranged on the top surface of the first body, the testing window communicated with the bottom surface of the loading cavity is arranged on the bottom surface of the first body, a first sealing ring is arranged between the bottom surface of the testing sample and the bottom surface of the loading cavity, the second body enters the loading cavity from the top surface of the first body, the testing sample is tightly sealed on the testing window through the first sealing ring, the first electrode is arranged on the second body, and the first electrode is contacted with the top surface of the testing sample when the second body tightly presses the testing sample.

3. The three electrode cell assembly of claim 2 wherein the top surface of the cell body is provided with a first mounting opening, the first body is sealingly mounted to the first mounting opening and extends into the cell body, and the second body is rotatably coupled to the first body when entering the loading chamber.

4. The three-electrode cell device of claim 2, wherein the first electrode comprises a first sub-electrode and a second sub-electrode, the first sub-electrode is elastically inserted into the second body and protrudes from the bottom surface of the second body for elastically contacting with the top surface of the test sample, the second sub-electrode is inserted into the second body and protrudes from the top surface of the second body, and the first sub-electrode is electrically connected with the second sub-electrode.

5. The three electrode cell device of claim 2, wherein a second seal ring is further disposed between the bottom surface of the second body and the top surface of the test sample, the second body being in compression seal with the top surface of the test sample by the second seal ring when entering the loading chamber.

6. The three-electrode electrolytic cell device according to claim 1, wherein a second mounting opening is formed in a side surface of the cell body, the second electrode is mounted on the second mounting opening in a sealing manner and is parallel to the bottom surface of the test sample, and the projection of the second electrode in the vertical direction completely covers the test window.

7. The three-electrode electrolytic cell device according to claim 1, wherein a third mounting port is formed in the top of the cell body, a temperature detection module is mounted on the third mounting port in a sealing manner, the height of the third mounting port is higher than the bottom surface of the test sample, and the third mounting port is the liquid injection port.

8. The three electrode cell arrangement of claim 7, wherein the third mounting port is further sealingly mounted with an air guide module.

9. The three-electrode electrolytic cell device according to claim 1, wherein a fourth mounting opening is formed in the top of the cell body, the third electrode is mounted on the fourth mounting opening in a sealing manner, the third electrode is parallel to the first electrode, the fourth mounting opening is higher than the bottom surface of the test sample in height, and the fourth mounting opening is the liquid injection opening.

10. The three electrode cell arrangement of claim 1, wherein the cell body is disposed in a circulating water bath.

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