Double electrolytic cell for detecting fish-scaling of enamel steel

Abstract

The invention relates to a double electrolytic cell for detecting fish-scaling of enamel steel. The double electrolytic cell consists of a top container and a bottom container, the top container serves as an electrolytic bath A, namely a hydrogen charging pool or a cathode pool, the shape of the top container is similar to that of a welding neck flange, the drift diameter is 40 mm, and a flange plate is rectangular; the bottom container serves as an electrolytic bath B, namely a hydrogen diffusion pool or an anode pool, the appearance of the bottom container is in a square barrel shape with a flange, a cylindrical pit is formed in the square barrel, the diameter of the cylindrical pit is 40 mm, the flange is rectangular, and the size of the flange is the same as that of a rectangular flange plate; the top container is vertically placed on the bottom container, and the bottom container is mounted on the two supporting plates; the electrolytic bath B is mounted on the two supporting plates through bearings and is fixed through pins in pin through holes in the supporting plates; and when the pin is drawn out of the pin blind hole of the electrolytic bath B, the electrolytic bath B freely rotates around the bearing. Compared with the prior art, the sample testing method disclosed by the invention can meet the BS EN10209-2023 standard requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of enamel steel detection, and relates to a double electrolytic cell for detecting enamel steel scale explosion. Background Technique

[0002] Enamel steel products are widely used in industries such as light industry, household appliances, metallurgy, chemical engineering, and construction. However, scale explosion is the most common product defect of enamel products. It will cause the enamel coating to break and peel off, directly exposing the metal substrate, leading to rust and even perforation, which means the scrapping of enamel steel products. Therefore, currently, relevant standards such as BS EN 10209-2023, ISO 10209-2014, and GB / T 29515-2013 are mainly used to evaluate the scale explosion resistance performance of steel plates. Among them, the BS EN 10209-2023 standard is generally recognized by many enterprises. Around the BS EN 10209-2023 standard, domestic innovation work on relevant enamel scale explosion performance detection devices has been carried out, such as patent CN111650258A, named "Double electrolysis experimental detection device and method for enamel steel scale explosion performance". Patent CN105486739A, named "Detection device and method for scale explosion resistance of steel for enamel based on micro differential pressure principle", patent CN109212004A, named "Drainage hydrogen measurement experimental detection device and detection method for enamel steel scale explosion performance", patent CN109490398A, named "Double electrolysis experimental detection device and detection method for enamel steel scale explosion performance".

[0003] For the enamel steel scale explosion performance detection device of the BS EN 10209-2023 standard, the experimental sample plate separates the experimental tank in the detection device to form an upper cavity and a lower cavity. The shape of the lower cavity is an inverted triangle, and there are two outlets at the bottom of the triangle, which are respectively connected to two capillary tubes. The outer end of one capillary tube is blocked by a sealing plug, and the other capillary tube extends outward and upward. The hydrogen gas precipitated excludes the liquid, causing the liquid level in the capillary tube to rise. And the rise of the liquid level in the capillary tube is caused by the increase in the volume of hydrogen gas precipitated on the lower surface of the sample plate. Therefore, it detects the liquid level height in the capillary tube through a photoelectric sensor.

[0004] For patent CN109490398A, named "Double electrolysis experimental detection device and detection method for enamel steel scale explosion performance", its experimental tank is separated by a sample plate to form an upper cavity of the experimental tank and a lower cavity of the experimental tank. The shape of the lower cavity of the experimental tank is an inverted triangle, and there is only one tubular outlet at its bottom, and the size is relatively large. It is equipped with a temperature control serpentine tube, a temperature measuring probe, a second pair of electrodes, and a reference electrode. It measures the change in current when hydrogen gas is precipitated through the second pair of electrodes, the sample plate, and the reference electrode connected to a potentiostat.

[0005] For patent CN109212004A, titled "An Experimental Detection Device and Method for Measuring Hydrogen by Draining Liquid for Scaling and Explosion Performance of Enamel Steel", the designed experimental tank is separated by a sample plate to form an upper cavity and a lower cavity. The shape of the lower cavity is an inverted triangle, and it has only one tubular outlet at the bottom, with a relatively large size, which is connected to a capillary to form a U shape. There are two resistance wires fixed in the capillary channel, and the part of the capillary channel section with the resistance wires is partially immersed in the conductive solution. The two resistance wires form a circuit through the conductive solution. It is connected to the two resistance wires through an electrical signal measuring instrument to detect the change of the circuit electrical signal to record the rise of the capillary liquid level, that is, to measure the relationship between the volume of hydrogen evolution and time in real time.

[0006] For patent CN111650258A, titled "Double Electrolysis Experimental Detection Device and Method for Scaling and Explosion Performance of Enamel Steel", the designed double electrolysis experimental detection device consists of a hydrogen charging tank and a hydrogen expansion tank, which are horizontally placed. There is a space for placing a sample plate in the middle. The motor is connected to a push rod, and the push rod is installed on the push rod guide rail and is on one side of the hydrogen charging tank. The hydrogen expansion tank is a fixed tank relative to the hydrogen charging tank. There is a pressure sensor on the rear end face of the hydrogen expansion tank, and the pressure sensor is connected to the motor through a central control computer; the hydrogen charging liquid storage tank and the hydrogen expansion liquid storage tank are placed side by side in a vertically arranged liquid storage moving tank. The designed experimental tank can facilitate the unloading and installation of the experimental solution. The main purpose is to achieve pollution-free recovery of all experimental solutions, without dripping and affecting the environment. In addition, it can also avoid the rupture of the flange edges of the hydrogen charging tank and the hydrogen expansion tank caused by excessive clamping force when manually installing the sample, or the liquid leakage in the cavities of the hydrogen charging tank and the hydrogen expansion tank caused by insufficient clamping force.

[0007] Among the above three methods, the double electrolysis tanks of the two invention patents, patent CN109490398A (Experimental Detection Device and Method for Measuring Hydrogen by Draining Liquid for Scaling and Explosion Performance of Enamel Steel) and patent CN109212004A (An Experimental Detection Device for Measuring Hydrogen by Draining Liquid for Scaling and Explosion Performance of Enamel Steel), are vertically placed in the same way as the BS EN 10209-2023 standard, while the double electrolysis tank of the invention patent CN111650258A (Double Electrolysis Experimental Detection Device and Method for Scaling and Explosion Performance of Enamel Steel) is horizontally placed. Obviously, none of the above three methods mention how to solve the problem of removing the residual air in the oxidation cell B, or the anode cell or the hydrogen expansion tank after clamping the test sample, and the residual air will affect the accuracy of the test results. Summary of the Invention

[0008] The purpose of the present invention is to provide a double electrolysis tank for detecting the scaling and explosion of enamel steel in order to overcome at least one defect of the above existing technologies. The present invention meets the experimental method requirements of the BS EN 10209-2023 standard, can quickly and accurately obtain the hydrogen penetration curve of the steel plate, and can also be used in other detection methods to evaluate the scaling and explosion sensitivity of enamel steel plates.

[0009] The object of the present invention can be achieved by the following technical solutions:

[0010] One of the technical solutions of the present invention is to provide a double electrolytic cell for detecting enamel steel scab explosion. The double electrolytic cell is composed of a top container and a bottom container; the top container serves as electrolytic cell A, that is, a hydrogen charging pool, or a cathode pool, and the bottom container serves as electrolytic cell B, that is, a hydrogen diffusion pool, or an anode pool. The top container is vertically placed on the bottom container, and the bottom container is installed on two support plates;

[0011] Electrolytic cell B is installed on two support plates through bearings and fixed by pins in the pin through holes on the support plates; when the pin is pulled out from the pin blind hole of electrolytic cell B, electrolytic cell B can rotate freely around the bearing.

[0012] Furthermore, electrolytic cell A is made of polytetrafluoroethylene, and its shape is similar to a high-neck flange, with a height of 100 mm. However, the flange is rectangular in shape, with a thickness of more than 30 mm, a length of 100 mm, and a width of 70 mm; the neck is in the shape of a circular hollow tube and is located at the center of the rectangular flange; the inner diameter of the hollow tube is 40 mm, the outer circle is concentric with the inner circle, and the wall thickness of the inner and outer circles is 15 - 50 mm; three through holes with a diameter of 5.5 mm are provided on each of the two sides of the rectangular flange.

[0013] Furthermore, electrolytic cell B is made by 3D printing with transparent resin, and its shape is similar to a cylindrical part with a flange. The outside of the cylinder is square, with a side length of 50 mm. There is a cylindrical pit inside the cylinder, with a diameter of 40 mm and a depth of 35 mm. This pit can be used as a container; the shape, size, and function of the flange on its upper part are the same as those of the rectangular flange. Three through holes are provided on each of the two sides of the rectangular flange. Since 3D printing cannot manufacture threads, threaded sleeves are inlaid in the through holes by a hot melting process to enhance the fastening between the copper sleeve and the flange. The thread size is M5, the outer diameter of the copper sleeve is 7 mm, and the height is 15 mm.

[0014] Furthermore, a square tube is located at the center of the rectangular flange, and there is a ring of tenon groove surfaces around the round hole near the surface of the rectangular flange platform.

[0015] Furthermore, at one end of each of the two sides of the square tube on the long side of the rectangular flange, there is a hollow cylindrical convex neck with an inner diameter of 1 mm, a protruding length of 15 mm, and an outer diameter of 6.5 mm. At the other end, there is a through hole with a diameter of 5 mm, which is connected to a plastic hose joint; on each of the two sides of the square tube on the short side of the rectangular flange, there is a cylindrical convex platform with a diameter of 5 mm for installing bearings, and there are also blind holes for fixing pins, with a diameter of 5 mm.

[0016] Furthermore, a conical funnel for converging residual air exists inside the hollow cylindrical convex neck with an inner diameter of 1 mm, which is more convenient for air discharge.

[0017] Furthermore, the support plate is made of PLA material and is manufactured by 3D printing. There is a bearing installation through-hole and a pin through-hole on the upper part of the support plate.

[0018] Furthermore, the double electrolytic cell is fixed on two support plates, which form a set of detection devices. This device can be arranged repeatedly, and multiple groups can be arranged side by side horizontally or front and back on a bottom plate.

[0019] Furthermore, electrolytic cell A is vertically placed on electrolytic cell B. The flange plane of electrolytic cell A directly faces the tenon-groove surface of the flange of electrolytic cell B. The inner round holes of the upper and lower electrolytic cells are aligned. At the same time, the threaded holes of the flange and the flange also need to be aligned. Place the metal sample to be tested in the middle of the rectangular flange and the rectangular flange. Add gaskets on both sides of the metal sample to be tested, and then put bolts into the through-holes of the flange and the threaded holes of the flange. Use a torque wrench to tighten all bolts with the same torque to fasten electrolytic cell A and electrolytic cell B, clamp the metal sample to be tested, and seal electrolytic cell B to prevent tilting and water leakage caused by uneven pressure.

[0020] The steps of putting electrolyte into the double electrolytic cell are to put electrolytic cell B first and then electrolytic cell A. The specific steps are as follows: Put electrolyte into the container of electrolytic cell B after the bolts are sealed. The method of putting the liquid is to inject it through a plastic hose connector. In order to prevent air from existing in electrolytic cell B, pull out the pin of electrolytic cell B and rotate the double electrolytic cell until the hollow cylindrical convex neck of electrolytic cell B is at the top. Continue to inject liquid through the plastic hose connector until all the air in the container of electrolytic cell B is completely removed. Then lock the plastic hose, rotate the double electrolytic cell to the vertical position of the top container and the bottom container again, and insert the pin to fix electrolytic cell B. Then put electrolyte on the upper part of electrolytic cell A. Then conduct tests according to the detection standard of the anti-scaling explosion performance of enameled steel in BS EN 10209-2023.

[0021] Furthermore, after the test is completed, first pull out the pin of electrolytic cell B, rotate the double electrolytic cell, pour out the electrolyte in the top electrolytic cell A into the receiving container. After all the electrolyte is completely poured out, then open the plastic hose connector of electrolytic cell B to drain the deionized water in the bottom container into the receiving container, and then close the plastic hose connector.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The present invention meets the experimental method required by the BS EN 10209-2023 standard, can quickly and accurately obtain the hydrogen penetration curve of the steel plate, and can also be used in other detection methods to evaluate the scaling explosion sensitivity of enameled steel plates.

[0024] (2) To prevent air from existing in electrolytic cell B, the present invention withdraws the pins of electrolytic cell B and rotates the double electrolytic cell around the bearing until the hollow cylindrical neck of electrolytic cell B is at the uppermost position, and continues to inject liquid through the plastic hose connector until the air in the container of electrolytic cell B is completely exhausted;

[0025] (3) There is a conical funnel for converging residual air inside the hollow cylindrical neck of the present invention, which is more convenient for exhausting air. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic perspective view of the double electrolytic cell for detecting enamel steel scale explosion in the embodiment of the present invention;

[0027] Figure 2 is a schematic cross-sectional view of the double electrolytic cell for detecting enamel steel scale explosion in the embodiment of the present invention;

[0028] Figure 3 is a schematic perspective view of the top container in the embodiment of the present invention;

[0029] Figure 4 is a schematic cross-sectional view of the top container in the embodiment of the present invention;

[0030] Figure 5 is a first schematic perspective view of the bottom container in the embodiment of the present invention;

[0031] Figure 6 is a second schematic perspective view of the bottom container in the embodiment of the present invention;

[0032] Figure 7 is a schematic cross-sectional view of the bottom container in the embodiment of the present invention;

[0033] Figure 8 is a schematic perspective view of the plastic hose connector in the embodiment of the present invention;

[0034] Figure 9 is a first schematic perspective view of the threaded sleeve in the embodiment of the present invention;

[0035] Figure 10 is a second schematic perspective view of the threaded sleeve in the embodiment of the present invention;

[0036] Figure 11 is a schematic perspective view of the support plate in the embodiment of the present invention;

[0037] Figure 12 is a schematic perspective view of the double electrolytic cell for detecting enamel steel scale explosion when it is tilted in the embodiment of the present invention;

[0038] Figure 13Schematic diagram of the three-dimensional structure when multiple double electrolytic cells for detecting fish-scale explosion of enameled steel in the embodiments of the present invention are used.

[0039] Explanation of the markings in the figure:

[0040] 1 - top container, 2 - metal sample to be tested, 3 - bottom container, 4 - support plate, 5 - bottom plate;

[0041] 101 - hollow tube, 102 - rectangular flange, 103 - first through hole;

[0042] 301 - cylindrical part, 302 - rectangular flange, 303 - second through hole, 304 - grooved surface, 305 - third through hole, 306 - convex neck, 307 - convex platform, 308 - plastic hose joint, 309 - conical funnel, 310 - cylindrical boss, 311 - blind hole, 312 - threaded sleeve;

[0043] 401 - bearing installation through hole, 402 - pin through hole, 403 - fourth through hole. Detailed implementation manners

[0044] The present invention will be described in detail below in conjunction with specific embodiments. These embodiments are implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0045] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are used to describe common objects, and only represent different instances referring to the same object, rather than implying that the objects described in this way must be in a given order, whether in terms of time, space, sorting, or any other way.

[0046] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0047] Embodiment:

[0048] A double electrolytic cell for detecting scale explosion of enameled steel, as Figure 1 and Figure 2 shown, the double electrolytic cell is composed of a top container and a bottom container; the top container 1 serves as electrolytic cell A, that is, the hydrogen charging pool, or the cathode pool, and the bottom container 2 serves as electrolytic cell B, that is, the hydrogen expansion pool, or the anode pool. The top container 1 is vertically placed on the bottom container 3, and the bottom container 3 is installed on two support plates 4;

[0049] As Figure 3 and Figure 4 shown, electrolytic cell A is made of polytetrafluoroethylene, and its shape is similar to a high-neck flange, with a height of 100 mm. However, the flange plate is rectangular, the thickness of the flange plate is more than 30 mm, 40 mm in this embodiment, the length is 100 mm, and the width is 70 mm; the neck shape is a circular hollow tube 101, which is located at the center of the rectangular flange plate 102; the inner diameter of the hollow tube 101 is 40 mm, the outer circle is concentric with the inner circle, and the wall thickness of the inner and outer circles is 15 - 50 mm, 30 mm in this embodiment; three first through holes 103 with a diameter of 5.5 mm are arranged on each side of the rectangular flange plate 102;

[0050] As Figure 5 and Figure 6 shown, electrolytic cell B is made by 3D printing with transparent resin, and its shape is similar to a flanged cylindrical part 301. The outside of the cylinder is square, with a side length of 50 mm. There is a cylindrical pit inside the cylinder, with a diameter of 40 mm and a depth of 35 mm. This pit can be used as a container; the shape, size and function of the flange on its upper part are the same as those of the rectangular flange plate 102. Three second through holes 303 are arranged on each side of the rectangular flange 302. Since 3D printing cannot manufacture threads, the second through holes 303 are inlaid with threaded sleeves 312 by a hot melt process to enhance the fastening between the copper sleeve and the flange, as Figure 9 and Figure 10 shown, the thread size is M5, the outer diameter of the copper sleeve is 7 mm, and the height is 15 mm;

[0051] The square tube is located at the center of the rectangular flange 302, and there is a ring of tenon groove surfaces 304 around the round hole close to the platform surface of the rectangular flange 302;

[0052] At one end of each side of the square tube located on the long side of the rectangular flange 302, there is a hollow cylindrical convex neck 306 with an inner diameter of 1 mm, a protruding length of 15 mm, an outer diameter of 6.5 mm, and at the other end, there is a third through hole 305 with a diameter of 5 mm, which is the same as that in Figure 8It is connected to the shown plastic hose joint 308. The plastic hose joint 308 is equipped with a nut. There is a boss 307 inside the third through-hole 305 to facilitate the installation of the plastic hose joint 308. On each side of the two sides of the square cylinder on the short side of the rectangular flange 302, there is a cylindrical boss 310 with a diameter of 5 mm for installing bearings. In addition, there are blind holes 311 for fixing pins, with a diameter of 5 mm.

[0053] As Figure 7 shown, inside the inner diameter 1 mm hollow cylindrical convex neck 306, there is a conical funnel 309 for converging residual air, which is more convenient for air discharge.

[0054] As Figure 11 shown, the support plate 4 is made of PLA material and is manufactured by 3D printing. There is a bearing installation through-hole 401 and a pin through-hole 402 on the upper part of the support plate 4.

[0055] As Figure 12 shown, the electrolytic cell B is installed on two support plates 4 through bearings and fixed by pins in the pin through-holes 402 on the support plates 4. When the pin is pulled out from the pin blind hole 311 of the electrolytic cell B, the electrolytic cell B can rotate freely around the bearing.

[0056] As Figure 13 shown, the double electrolytic cell is fixed on two support plates 4, which is a set of detection devices. This device can be arranged repeatedly, and multiple groups can be arranged side by side horizontally or front and back on a bottom plate 5 and fixed by bolts through the fourth through-hole 403.

[0057] A method for detecting fish-scale explosion of enameled steel uses the above double electrolytic cell to detect fish-scale explosion of enameled steel. The specific steps are as follows:

[0058] S1. The electrolytic cell A is vertically placed on the electrolytic cell B. The flange plane of the electrolytic cell A directly faces the tenon-groove surface 304 of the flange of the electrolytic cell B. The inner round holes of the upper and lower electrolytic cells are aligned. At the same time, the threaded holes of the flange and the flange also need to be aligned. Place the metal sample 2 to be tested between the rectangular flange 102 and the rectangular flange 302. Add gaskets on both sides of the metal sample 2 to be tested, and then put the bolts into the through-holes of the flange and the threaded holes of the flange. Use a torque wrench to tighten all the bolts with the same torque to fasten the electrolytic cell A and the electrolytic cell B, clamp the metal sample 2 to be tested, and seal the electrolytic cell B to prevent tilting and water leakage caused by uneven pressure.

[0059] S2. The step of putting electrolyte in the double electrolytic cell is to put electrolytic cell B first and then electrolytic cell A. The specific steps are as follows: Put deionized water or other specified electrolytes in the container of electrolytic cell B after the bolts are sealed. The method of putting the liquid is to inject it through the plastic hose connector 308. To prevent air from existing in electrolytic cell B, pull out the pin of electrolytic cell B and rotate the double electrolytic cell until the hollow cylindrical neck 306 of electrolytic cell B is at the top. Continue to inject the liquid through the plastic hose connector 308 until the air in the container of electrolytic cell B is completely removed. Then lock the plastic hose, rotate the double electrolytic cell again until the top container 1 and the bottom container 3 are vertical, and insert the pin to fix electrolytic cell B. Then put a 6% H2SO4 solution of 0.25 g / l HgCl2 and 0.5 g / l As2O3 (add 60 ml of H2SO4 to 940 ml of distilled water) or other specified electrolytes in the upper part of electrolytic cell A. Then conduct the detection according to the detection standard of the anti-scaling explosion performance of enameled steel in BS EN 10209-2023, or conduct the detection according to other standards.

[0060] S3. After the detection is completed, first pull out the pin of electrolytic cell B, rotate the double electrolytic cell, pour out the electrolyte in the top electrolytic cell A into the specified receiving container. After the electrolyte is completely poured out, then open the plastic hose connector of electrolytic cell B to drain the deionized water in the bottom container into the specified receiving container, and then close the plastic hose connector 308.

[0061] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention according to the disclosure of the present invention should be within the protection scope of the present invention.

Claims

1. A double electrolytic cell for detecting fish-scale explosion of enameled steel, characterized in that, The double electrolytic cell consists of a top container and a bottom container; the top container serves as electrolytic cell A, i.e., the hydrogen charging cell, or the cathode cell, and the bottom container serves as electrolytic cell B, i.e., the hydrogen diffusion cell, or the anode cell. The top container is vertically placed on the bottom container, and the bottom container is installed on two support plates; Electrolytic cell B is installed on two support plates through bearings and fixed by pins in the pin through-holes on the support plates; when the pins are pulled out from the pin blind holes of electrolytic cell B, electrolytic cell B can rotate freely around the bearings.

2. The double electrolytic cell for detecting fish-scale explosion of enamel steel according to claim 1, wherein, Electrolytic cell A is made of polytetrafluoroethylene. Its shape is similar to a high-neck flange, with a height of 100 mm. However, the flange is rectangular, with a thickness of more than 30 mm, a length of 100 mm, and a width of 70 mm; the neck is in the shape of a circular hollow tube, located at the center of the rectangular flange; the inner diameter of the hollow tube is 40 mm, the outer circle is concentric with the inner circle, and the wall thickness of the inner and outer circles is 15 - 50 mm; three through-holes with a diameter of 5.5 mm are arranged on each side of the rectangular flange.

3. A double electrolytic cell for detecting enamel steel scale explosion according to claim 1, characterized in that, Electrolytic cell B is made by 3D printing with transparent resin. Its shape is similar to a cylindrical part with a flange. The outside of the cylinder is square, with a side length of 50 mm. There is a cylindrical pit inside the cylinder, with a diameter of 40 mm and a depth of 35 mm. This pit can be used as a container; the shape, size, and function of the flange on its upper part are the same as those of the rectangular flange. Three through-holes are arranged on each side of the rectangular flange. Since threads cannot be manufactured by 3D printing, threaded sleeves are inlaid in the through-holes by a hot-melt process to enhance the fastening between the copper sleeves and the flange. The thread size is M5, the outer diameter of the copper sleeve is 7 mm, and the height is 15 mm.

4. The electrolytic cell B according to claim 3, characterized in that, The square tube is located at the center of the rectangular flange, and there is a circle of tenon-groove surfaces around the round hole near the surface of the rectangular flange platform.

5. The electrolytic cell B according to claim 3, characterized in that, At one end of each of the two sides of the square tube on the long side of the rectangular flange, there is a hollow cylindrical convex neck with an inner diameter of 1 mm, a protruding length of 15 mm, and an outer diameter of 6.5 mm. At the other end, there is a through-hole with a diameter of 5 mm, which is connected to a plastic hose joint; on each of the two sides of the square tube on the short side of the rectangular flange, there is a cylindrical convex platform with a diameter of 5 mm for installing bearings, and there are also blind holes for fixing pins, with a diameter of 5 mm.

6. The electrolytic cell B according to claim 3, characterized in that, There is a conical funnel for converging residual air inside the hollow cylindrical convex neck with an inner diameter of 1 mm, which is more convenient for air discharge.

7. A double electrolytic cell for detecting fish-scale explosion of enameled steel, according to claim 1, characterized in that, The support plate is made of PLA material and is made by 3D printing; there is a bearing installation through-hole and a pin through-hole on the upper part of the support plate.

8. A double electrolytic cell for detecting scale explosion of enamel steel according to claim 1, characterized in that, The double electrolytic cell is fixed on two support plates, which is a set of detection devices. This device can be arranged repeatedly, and multiple sets can be arranged side by side horizontally or front and back on a bottom plate.

9. A double electrolytic cell for detecting fish-scale explosion of enameled steel according to any one of claims 1 to 8, characterized in that, The electrolytic cell A is vertically placed on the electrolytic cell B. The flange plane of the electrolytic cell A directly faces the tenon and mortise surface of the flange of the electrolytic cell B. The inner round holes of the upper and lower electrolytic cells are aligned, and at the same time, the threaded holes of the flange and the flange need to be aligned; place the metal sample to be tested in the middle of the rectangular flange and the rectangular flange, add gaskets on both sides of the metal sample to be tested, and then put the bolts into the through holes of the flange and the threaded holes of the flange, and use a torque wrench to tighten all the bolts with the same torque to fasten the electrolytic cell A and the electrolytic cell B, clamp the metal sample to be tested, and seal the electrolytic cell B to prevent tilting and water leakage caused by uneven pressure; The steps of putting electrolyte into the double electrolytic cell are to put the electrolytic cell B first and then the electrolytic cell A; the specific steps are as follows: put electrolyte into the container of the electrolytic cell B after the bolts are sealed. The method of putting the liquid is to inject it through a plastic hose joint. In order to prevent air from existing in the electrolytic cell B, pull out the pin of the electrolytic cell B and rotate the double electrolytic cell until the hollow cylindrical convex neck of the electrolytic cell B is at the top. Continue to inject the liquid through the plastic hose joint until the air in the container of the electrolytic cell B is completely exhausted, then lock the plastic hose, rotate the double electrolytic cell to the vertical position of the top container and the bottom container again, and insert the pin to fix the electrolytic cell B; then put electrolyte in the upper part of the electrolytic cell A; then conduct the test according to the detection standard of the anti-scaling explosion performance of enameled steel in BS EN 10209-2023.

10. A double electrolytic cell for detecting fish-scale explosion of enamel steel according to claim 9, characterized in that, After the test is completed, first pull out the pin of the electrolytic cell B, rotate the double electrolytic cell, pour out the electrolyte in the top electrolytic cell A into the receiving container. After the electrolyte is completely poured out, then open the plastic hose joint of the electrolytic cell B to drain the deionized water in the bottom container into the receiving container, and then close the plastic hose joint.

Images