Electrochemical cell for testing corrosion current of polar plate

Abstract

The invention relates to an electrochemical cell for testing corrosion current of a polar plate. The electrochemical cell comprises a cell main body, a cell cover plate, a sealing element and a working electrode knob, the cell main body is of a hollow structure, the top surface of the cell main body is not closed, a hole is formed in the side surface of the cell main body, the cell main body is connected with a hollow cylinder coaxial with the hole, the cell cover plate covers the unclosed top of the cell main body, a to-be-tested polar plate sample, the sealing element and the working electrode knob are sequentially mounted in the hollow cylinder from inside to outside, and the sealing element is in interference fit with the hollow cylinder. Compared with the prior art, the brand-new electrochemical cell for testing the corrosion current of the polar plate is provided, and a separated electric contact structure is adopted, so that mounting of a polar plate sample and exporting of an electric signal are facilitated; the hollow cylinder structure of the cell main body is convenient for placing a pole plate sample to be tested, and is convenient for sealing of a sealing element and installation of a working electrode; and a back sealing mode is adopted, so that the liquid leakage phenomenon caused by front sealing is avoided, and the like.

Description

Technical Field

[0001] The invention relates to a polar plate of a fuel cell, in particular to an electrochemical cell used for testing corrosion current of the polar plate. Background Art

[0002] There are three main methods for testing the corrosion current of fuel cell plates. The first method is based on the test method in the national standard "GB / T20042.6-2011". The plate and the wire are packaged, and only the surface to be tested is exposed. The packaged plate is directly suspended in the electrolyte for electrochemical testing; the second method is disclosed in the application publication number CN111198154A, which uses a specific electrode clamping device to clamp the plate and suspend it in the electrolyte for testing; the third method is to use a specific electrochemical cell, open a hole on the side of the cell body and provide an extrusion structure on the outside, directly press the plate against the opening, and seal the plate and the electrochemical cell body with a sealing gasket. The first method involves the use of glue with a curing effect. The preparation work before the test is time-consuming, and the cured organic material cannot remain stable in the electrolyte for a long time. In the second method, the area where the plate is clamped is in direct contact with the electrolyte. The conductive material in this area is also involved in the electrochemical test, which seriously affects the test results. The third method, although it overcomes the shortcomings of the first and second methods, cannot effectively seal the plate with a flow channel structure because the sealing structure is located between the plate and the cell body.

[0003] After searching, the authorization announcement number CN205826591U discloses an electrolytic cell for measuring electrochemical corrosion, which specifically discloses: a chamber for containing a solution is provided in the main body; wherein a through hole is formed on one side surface of the main body, and the through hole extends to the chamber; the working surface of the working electrode faces the through hole, and the working electrode is fixed on the side surface of the main body; and a first electrode socket is provided on the top surface of the main body, and one end of the reference electrode and the auxiliary electrode are inserted into the chamber through the first electrode socket, and the auxiliary electrode is opposite to the working surface of the working electrode through the through hole.

[0004] However, the existing patent uses an O-ring to seal between the plate and the cell body, which still cannot effectively seal the plate with a flow channel structure. Therefore, how to design a fuel cell plate corrosion current test device that is easy to operate, has accurate test results and good sealing effect is a technical problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to provide an electrochemical cell for plate corrosion current testing in order to overcome the defects of the above-mentioned prior art, such as complicated operation, inaccurate test results or poor sealing effect.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, there is provided an electrochemical cell for testing electrode corrosion current, which is used for electrode plate samples to be tested. The electrochemical cell comprises a cell body, a cell body cover, a seal and a working electrode knob. The cell body is a hollow structure with an unclosed top surface, a hole provided on the side surface and connected to a hollow cylinder coaxial with the hole. The cell body cover is covered on the unclosed top of the cell body. The electrode plate sample to be tested, the seal and the working electrode knob are sequentially installed in the hollow cylinder from the inside to the outside, and the seal and the hollow cylinder are interference fit.

[0008] As a preferred technical solution, the hollow part of the hollow cylinder is composed of a support surface, a sealing surface and an internal thread from the inside to the outside.

[0009] As a preferred technical solution, the electrode plate sample to be tested is placed on a supporting surface.

[0010] As a preferred technical solution, the sealing surface is a conical surface, the sealing member is conical, and the inclination angles of the conical surface and the conical surface of the sealing member are consistent.

[0011] As a preferred technical solution, the outer side of the working electrode knob is provided with an external thread, and the external thread matches the internal thread in the hollow cylinder.

[0012] As a preferred technical solution, the pool cover has a protruding structure, and the outline of the protruding structure is consistent with the unclosed top projection outline of the pool column.

[0013] As a preferred technical solution, the pool cover is provided with a cover through hole.

[0014] As a preferred technical solution, a spring pin is fixed at the center of the working electrode knob, and the movable end of the spring pin points to the cell body.

[0015] As a preferred technical solution, a through hole is provided in the center of the sealing member for the spring ejector pin to pass through.

[0016] As a preferred technical solution, the sealing member is made of silicone.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The present invention proposes a new electrochemical cell for testing electrode corrosion current, which adopts a separate electrical contact structure to facilitate the installation of electrode samples and the derivation of electrical signals;

[0019] 2) The hollow cylindrical structure of the cell body of the present invention is provided with a supporting surface, a sealing surface and a thread, which is convenient for placing the electrode sample to be tested, and is also convenient for sealing of the sealing member and installation of the working electrode; the conical sealing surface and the sealing member are adopted, which is convenient for installation and tight sealing;

[0020] 3) The present invention adopts a back side sealing method to avoid liquid leakage caused by front side sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded view of an electrochemical cell for plate corrosion current testing according to the present invention;

[0022] Figure 2 It is a schematic diagram of the hollow cylindrical structure of the pool body of the present invention;

[0023] Figure 1 As shown in the bid number:

[0024] 1. electrode sample to be tested, 2. cell body, 20. hollow cylinder, 3. cell cover, 30. protruding structure, 31. cover through hole, 4. sealing member, 40. through hole, 5. working electrode knob, 50. external thread, 51. spring ejector pin;

[0025] Figure 2 As shown in the bid number:

[0026] 200, supporting surface, 201, sealing surface, 202, internal thread. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] The present invention provides an electrochemical cell for testing the corrosion current of a plate, which can conveniently perform an electrochemical test of the corrosion current on a plate with a flow channel structure.

[0029] like Figure 1 As shown, the present invention includes a cell body 2, a cell body cover 3, a sealing member 4 and a working electrode knob 5.

[0030] The cell body 2 is a hollow cubic structure, the top is not closed, a circular hole is provided on the side, and a hollow cylinder 20 structure coaxial with the circular hole is provided outside the side where the circular hole is located. The electrolyte is located in the cell body 2.

[0031] like Figure 2As shown, the hollow part in the hollow cylinder 20 structure is composed of an internal thread 202, a sealing surface 201 and a supporting surface 200 from the outside to the inside; the supporting surface 200 is used to place the electrode plate sample 1 to be tested, the diameter of the circular hole is smaller than the diameter of the supporting surface 200, the shape of the electrode plate sample 1 to be tested is the same as the supporting surface 200, the sealing surface 201 is used to install the sealing member 4, the sealing surface 201 is a conical surface, the sealing member 4 is a conical sealing member 4, the inclination angles of the conical surface and the conical sealing member 4 are kept consistent, and the two are installed with interference fit.

[0032] The pool cover 3 covers the unclosed top of the pool body 2 and is provided with a protruding structure 30 . The protruding structure 30 is consistent with the projection contour of the unclosed surface of the pool body 2 and can be tightly covered on the pool body 2 . The pool cover 3 is also provided with a through hole 40 .

[0033] The working electrode knob 5 has an external thread 50 on its periphery, and the specifications of the external thread 50 are consistent with the specifications of the internal thread 202 of the hollow cylinder 20 structure. The working electrode knob 5 and the hollow cylinder 20 are fixed by a threaded connection; a spring pin 51 is fixed at the center position of the working electrode knob 5, and the movable end of the spring pin 51 points to the cell body 2.

[0034] The sealing member 4 is made of silicone and has a through hole 40 at its center, through which the spring pin 51 on the working electrode knob 5 can pass to reach the electrode plate sample 1 to be tested.

[0035] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An electrochemical cell for testing the corrosion current of a plate, used for a plate sample to be tested (1), It is characterized in that The electrochemical cell comprises a cell body (2), a cell body cover (3), a sealing member (4) and a working electrode knob (5); the cell body (2) is a hollow structure, the top surface of which is not closed, and the side surface is provided with a hole and connected to a hollow cylinder (20) coaxial with the hole; the cell body cover (3) covers the unclosed top of the cell body (2); the electrode plate sample (1), the sealing member (4) and the working electrode knob (5) are sequentially installed in the hollow cylinder (20) from the inside to the outside; the sealing member (4) and the hollow cylinder (20) are interference fit.

2. An electrochemical cell for plate corrosion current testing according to claim 1, It is characterized in that The hollow part of the hollow cylinder (20) comprises, from inside to outside, a supporting surface (200), a sealing surface (201) and an internal thread (202).

3. An electrochemical cell for plate corrosion current testing according to claim 2, It is characterized in that The electrode plate sample (1) to be tested is placed on the supporting surface (200).

4. An electrochemical cell for plate corrosion current testing according to claim 2, It is characterized in that The sealing surface (201) is a conical surface, the sealing member (4) is conical, and the conical surface and the sealing member (4) have the same inclination angle.

5. An electrochemical cell for plate corrosion current testing according to claim 2, It is characterized in that The working electrode knob (5) is provided with an external thread (50) on the outside, and the external thread (50) matches with the internal thread (202) in the hollow cylinder (20).

6. An electrochemical cell for plate corrosion current testing according to claim 1, It is characterized in that The pool cover plate (3) has a protruding structure (30), and the outline of the protruding structure (30) is consistent with the outline of the unclosed top projection of the pool column.

7. An electrochemical cell for plate corrosion current testing according to claim 1, It is characterized in that The pool body cover plate (3) is provided with a cover plate through hole (31).

8. An electrochemical cell for plate corrosion current testing according to claim 1, It is characterized in that A spring ejector pin (51) is fixed at the center of the working electrode knob (5), and the movable end of the spring ejector pin (51) points toward the cell body (2).

9. An electrochemical cell for plate corrosion current testing according to claim 8, It is characterized in that The sealing member (4) is provided with a through hole (40) at its center for the spring ejector pin (51) to pass through.

10. An electrochemical cell for plate corrosion current testing according to claim 1, It is characterized in that The sealing member (4) is made of silicone rubber.

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