Electrochemical testing system for concrete corrosion inhibitor

Abstract

The utility model discloses an electrochemical testing system for a concrete corrosion inhibitor. The electrochemical testing system comprises an electrolysis tank, an auxiliary electrode, a working electrode and an electrochemical measuring instrument, the electrolysis tank comprises a solution tank, a workpiece box and a cover body, the solution tank is provided with a cavity with an opening in one side, the workpiece box is provided with a containing cavity with an opening in one side and a communicating opening communicating the containing cavity with the cavity, and the cover body is connected with the solution tank and seals the opening of the cavity; the auxiliary electrode is at least partially located in the cavity; the working electrode is clamped in the accommodating cavity and blocks the communicating opening; and the electrochemical measuring instrument is electrically connected with the auxiliary electrode and the working electrode respectively. According to the scheme, the device can be in contact with the simulated pore liquid in the solution box through the communication port, electrochemical performance detection of the corrosion inhibitor is completed, the simulated pore liquid is in a sealed environment and is prevented from being polluted, the detection precision is improved, operation is convenient and fast, the structure is simple, and cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to concrete rust inhibitor test technical field, concretely relates to a kind of concrete rust inhibitor electrochemical test system. BACKGROUND

[0002] Coastal reinforced concrete building is often subjected to the action of seawater dry-wet alternation, which makes the transmission of erosive ions in the pores of concrete, and causes chemical reaction with cement hydration products, leading to corrosion of steel bars in concrete, affecting the service life of concrete structure. Therefore, rust inhibitor is usually added to concrete to prevent or slow down the corrosion of steel bars. In order to ensure the correct use of qualified rust inhibitor and ensure the quality and safety of reinforced concrete building, the electrochemical performance of steel rust inhibitor needs to be detected.

[0003] The authorized announcement number CN204649678U discloses a system for detecting the electrochemical performance of steel rust inhibitor. In use, different rust inhibitors to be detected are used to make working electrodes, sodium chloride solution is poured into the electrolytic cell, the working electrode, the reference electrode and the auxiliary electrode are connected to the steel corrosion instrument, and the values of constant potential and constant current on the steel corrosion instrument are observed to obtain the electrochemical performance of different rust inhibitors, so as to judge the steel corrosion resistance of the rust inhibitor.

[0004] However, in order to replace the working electrode during repeated testing, the working electrode is directly placed in the electrolytic cell with an open setting, which increases the pollution risk of simulated interstitial fluid in the electrolytic cell and has an adverse effect on the measurement accuracy. UTILITY MODEL CONTENT

[0005] The utility model aims to overcome the above technical deficiencies and provides a concrete rust inhibitor electrochemical test system to solve the technical problem that, in order to replace the working electrode during repeated testing, the working electrode is directly placed in the electrolytic cell with an open setting, which increases the pollution risk of simulated interstitial fluid in the electrolytic cell and has an adverse effect on the measurement accuracy.

[0006] To achieve the above technical purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a kind of concrete rust inhibitor electrochemical test system, comprising:

[0008] The electrolytic box includes a solution tank, a workpiece box and a cover body. The solution tank has a cavity with one side opening. The workpiece box has a container cavity with one side opening and a communication port connecting the container cavity and the cavity. The cover body connects the solution tank and closes the opening of the cavity.

[0009] The auxiliary electrode is at least partially located in the cavity.

[0010] a working electrode, which is arranged in the cavity and blocks the communication port; and

[0011] an electrochemical measuring instrument, which is electrically connected with the auxiliary electrode and the working electrode respectively.

[0012] In some embodiments, the electrolytic tank further comprises an elastic member and a locking structure, the elastic member connects the working electrode and the inner wall of the cavity, and is used to drive the working electrode to pop out of the opening of the cavity, and the locking structure is arranged on the workpiece box and can lock and unlock the working electrode.

[0013] In some embodiments, the locking structure comprises a mounting shaft and a locking plate, the mounting shaft is rotatably arranged on the workpiece box and located at the opening end of the cavity, and the locking plate is connected with the mounting shaft and can extend into and out of the opening of the cavity when following the rotation of the mounting shaft.

[0014] In some embodiments, the side of the locking plate away from the cavity is provided with anti-skid stripes.

[0015] In some embodiments, the elastic member comprises a compression spring, and the compression spring connects the working electrode and the inner wall of the cavity.

[0016] In some embodiments, the inner wall of the cavity is provided with a mounting table, and the mounting table is located at the side of the communication port close to the opening of the cavity.

[0017] The working electrode is provided with a matching table corresponding to the mounting table, the matching table is located at the side of the mounting table away from the communication port, and the compression spring connects the mounting table and the matching table.

[0018] In some embodiments, the electrolytic tank further comprises a sealing ring, the sealing ring is arranged on the inner wall of the cavity and located between the mounting table and the communication port, and is placed at the side of the working electrode close to the communication port.

[0019] In some embodiments, the inner wall of the cavity is provided with a conductive column, the conductive column is located at the side of the cavity away from the opening thereof and is electrically connected with the electrochemical measuring instrument.

[0020] The working electrode is provided with a plug-in hole corresponding to the conductive column, and the plug-in hole is used for inserting the conductive column.

[0021] In some embodiments, the surface of the working electrode is composed of a reaction area and an isolation area, and the reaction area is directly opposite to the communication port.

[0022] The concrete corrosion inhibitor electrochemical test system further comprises an isolation film layer, and the isolation film layer covers the isolation area.

[0023] In some embodiments, the concrete corrosion inhibitor electrochemical test system further comprises a temperature regulating device and a reference electrode, the temperature regulating device is in thermal conduction connection with the solution tank, and the reference electrode is at least partially located in the cavity and electrically connected with the electrochemical measuring instrument.

[0024] Compared with the prior art, in the concrete corrosion inhibitor electrochemical test system, the simulated pore solution is placed in the cavity of the solution tank, and the opening of the solution tank is covered by the cover, so that the simulated pore solution is in a sealed environment and is prevented from being polluted. Meanwhile, the working electrode is placed in the cavity of the workpiece box and blocks the communication port, on the one hand, the working electrode can contact the simulated pore solution in the solution tank through the communication port to complete the electrochemical performance detection of the corrosion inhibitor, and after the test is completed, the working electrode can be directly taken out from the opening of the workpiece box and another working electrode to be tested can be installed, thereby improving the convenience of taking and placing the working electrode; on the other hand, the working electrode can block the communication port, further making the simulated pore solution in a sealed environment and preventing the simulated pore solution from being polluted, improving the detection precision, and being convenient to operate, simple in structure and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a schematic view of the concrete corrosion inhibitor electrochemical test system provided by the embodiment of the utility model;

[0026] Figure 2 is Figure 1 a schematic view of the electrolysis tank, the working electrode and the locking structure;

[0027] Figure 3 is Figure 2 a top view of the electrolysis tank, the working electrode and the locking structure;

[0028] Figure 4 is Figure 2 a partial exploded view of the electrolysis tank, the working electrode and the locking structure;

[0029] Figure 5 is Figure 2 a partial sectional view of the electrolysis tank, the working electrode and the locking structure in the A-A plane;

[0030] Figure 6 is Figure 2 a sectional view of the electrolysis tank, the working electrode and the locking structure in the B-B plane;

[0031] Figure 7 is Figure 5 a partial schematic view of the electrolysis tank.

[0032] Explanation of reference signs:

[0033] 1. Electrolysis tank; 11. Solution tank; 11a. Cavity; 12. Workpiece box; 12a. Container; 12b. Connecting port; 121. Mounting platform; 122. Conductive post; 13. Cover; 14. Elastic element; 15. Locking structure; 151. Mounting shaft; 152. Locking plate; 16. Sealing ring; 2. Auxiliary electrode; 3. Working electrode; 3a. Insertion hole; 31. Mating platform; 4. Electrochemical measuring instrument; 5. Temperature control device; 6. Reference electrode. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0035] To address the technical problem in existing technologies where the working electrode is placed directly in an open electrolytic cell for easy replacement during repeated testing, increasing the risk of contamination of the simulated pore liquid in the electrolytic cell and adversely affecting measurement accuracy, this invention provides an electrochemical testing system for concrete rust inhibitors. This system avoids contamination of the simulated pore liquid, improves detection accuracy, and features a simple structure and cost savings.

[0036] Please see Figures 1 to 5 , Figures 1 to 5 This is a schematic diagram of the structure of an electrochemical testing system for concrete rust inhibitors according to an embodiment of the present invention. The electrochemical testing system for concrete rust inhibitors includes an electrolysis tank 1, an auxiliary electrode 2, a working electrode 3, and an electrochemical measuring instrument 4. The electrolysis tank 1 includes a solution tank 11, a workpiece box 12, and a cover 13. The solution tank 11 has a cavity 11a with an opening on one side. The workpiece box 12 has a container 12a with an opening on one side and a connecting port 12b connecting the container 12a and the cavity 11a. The cover 13 connects to the solution tank 11 and closes the opening of the cavity 11a. The auxiliary electrode 2 is at least partially located inside the cavity 11a. The working electrode 3 is engaged in the container 12a and blocks the connecting port 12b. The electrochemical measuring instrument 4 is electrically connected to the auxiliary electrode 2 and the working electrode 3, respectively.

[0037] The electrochemical testing system for concrete rust inhibitors provided by this invention places the simulated pore liquid in the cavity 11a of the solution tank 11, and covers the opening of the solution tank 11 with a cover 13, ensuring the simulated pore liquid is in a sealed environment and preventing contamination. Simultaneously, the working electrode 3 is placed in the cavity 12a of the workpiece box 12, and the connecting port 12b is sealed. This allows the working electrode 3 to contact the simulated pore liquid in the solution tank 11 through the connecting port 12b, completing the electrochemical performance testing of the rust inhibitor. After the test, the working electrode 3 can be directly removed from the opening of the workpiece box 12, and another working electrode 3 to be tested can be installed, improving the ease of removing and placing the working electrode 3. Furthermore, the sealing of the connecting port 12b by the working electrode 3 further ensures the simulated pore liquid is in a sealed environment, preventing contamination, improving testing accuracy, and offering convenient operation, simple structure, and cost savings.

[0038] It should be noted that the electrochemical measuring instrument 4 can be one of an electrochemical workstation, a steel corrosion analyzer, an ammeter, or a potential meter. Specifically, in this scheme, the electrochemical measuring instrument 4 is an electrochemical workstation, capable of performing linear polarization and AC impedance tests, and the corrosion-inhibiting performance of the concrete corrosion inhibitor is determined based on the test results. Furthermore, the solution tank 11, the cover 13, and the workpiece box 12 are made of glass.

[0039] It should be understood that the specific arrangement of the cover 13 is not limited, as long as it can cover the opening of the solution tank 11. In one embodiment, the cover 13 is set as a circular cover plate. In another embodiment, the cover 13 is set as a cover plate and a side plate. In addition, the cover 13 can also be set as a cover plate plus two limiting plates, with the two limiting plates spaced apart on the inner side of the cover plate, so that the cover plate can cover the solution tank 11. In this solution, the auxiliary electrode 2 is a platinum sheet electrode, and the cover 13 is in the form of a cover plate, with holes provided on the cover plate for the auxiliary electrode 2 to pass through.

[0040] Additionally, it should be noted that in one embodiment, the working electrode 3 is a steel bar test block that has been cut and ground to a specified roughness and coated with a rust inhibitor.

[0041] In one embodiment, please refer to Figures 4 to 6 The electrolysis box 1 also includes an elastic element 14 and a locking structure 15. The elastic element 14 is connected to the working electrode 3 and the inner wall of the cavity 12a, and is used to drive the working electrode 3 to pop out from the opening of the cavity 12a. The locking structure 15 is provided in the workpiece box 12 and can lock the working electrode 3 in the workpiece box 12 and can unlock the working electrode 3.

[0042] In this embodiment, after the working electrode 3 has been tested, it is unlocked by the locking structure 15. Under the action of the elastic element 14, the working electrode 3 can automatically pop out of the workpiece box 12, making it easy for the tester to remove it. Then, the next working electrode 3 to be tested is pressed into the workpiece box 12 and locked again by the locking structure 15.

[0043] It should be noted that the specific configuration of the locking structure 15 is not limited, as long as it can achieve both unlocking and locking of the working motor. In one embodiment, the locking structure 15 is in the form of a pin, and a pin hole is provided on the workpiece box 12 so that the working pin can extend into and abut against the working electrode 3. In another embodiment, the locking structure 15 is in the form of a locking bolt, and a locking screw hole is provided on the workpiece box 12 so that the locking bolt can extend into and abut against the working electrode 3.

[0044] In another embodiment, the locking structure 15 includes a mounting shaft 151 and a locking plate 152. The mounting shaft 151 is rotatably mounted on the workpiece box 12 about its axial direction and is located at the opening end of the cavity 12a. The locking plate 152 is connected to the mounting shaft 151 and can extend into and out of the opening of the cavity 12a when rotating with the mounting shaft 151.

[0045] In this embodiment, the locking plate 152 is rotated to the position of the opening of the workpiece box 12 to prevent the working electrode 3 from being ejected from the opening of the workpiece box 12 by the elastic member 14. When the test is completed and the next working electrode 3 needs to be replaced, the locking plate 152 can simply be rotated to a position away from the opening of the workpiece box 12. It should be noted that in this solution, a limiting flange is provided in the shaft hole of the workpiece box 12, and a limiting groove is provided on the mounting shaft 151. The limiting groove extends circumferentially along the mounting shaft 151, and the limiting flange extends into the limiting groove to restrict the axial movement of the mounting shaft 151.

[0046] In one embodiment, the locking plate 152 has anti-slip stripes on the side away from the cavity 12a.

[0047] In this embodiment, anti-slip stripes are provided on the side of the locking plate 152 away from the workpiece box 12 to facilitate the operator to move the locking plate 152 and improve convenience.

[0048] It should be noted that the specific arrangement of the elastic element 14 is not limited, as long as it enables the working electrode 3 to pop out from the opening of the workpiece box 12. In one embodiment, the elastic element 14 is set as a spring between the workpiece box 12 and the working electrode 3. In another embodiment, the elastic element 14 is set as an elastic pad between the workpiece box 12 and the working electrode 3.

[0049] In another embodiment, the elastic element 14 includes a compression spring that connects the working electrode 3 and the inner wall of the cavity 12a.

[0050] In this embodiment, the elastic element 14 is set as a compression spring. One end of the compression spring can be fixedly connected to the inner wall of the cavity 12a of the workpiece box 12, and the other end abuts against the working electrode 3, so the structure is stable and reliable.

[0051] In one embodiment, the inner wall of the cavity 12a is provided with a mounting platform 121, which is located on the side of the communication port 12b near the opening of the cavity 12a; the working electrode 3 is provided with a mating platform 31 corresponding to the mounting platform 121, which is located on the side of the mounting platform 121 away from the communication port 12b, and a compression spring connects the mounting platform 121 and the mating platform 31.

[0052] In this embodiment, a mounting platform 121 is provided on the side of the cavity 12a away from the connecting port 12b, and a mating platform 31 is provided on the working electrode 3 corresponding to the mounting platform 121. At the same time, a compression spring is placed between the mounting platform 121 and the mating platform 31. On the one hand, the mounting platform 121 and the mating platform 31 can limit the leakage of simulated pore liquid, and on the other hand, improve the stability of the working electrode 3 when it is ejected.

[0053] In one embodiment, the electrolytic cell 1 further includes a sealing ring 16, which is installed on the inner wall of the cavity 12a and located between the mounting platform 121 and the communication port 12b, and is placed on the side of the working electrode 3 near the communication port 12b.

[0054] In this embodiment, a sealing ring 16 is provided between the mounting platform 121 and the connecting port 12b to further limit the leakage of simulated pore fluid from the connecting port 12b. It should be noted that in this solution, a sealing groove for installing the sealing ring 16 is provided between the mounting platform 121 and the connecting port 12b.

[0055] In one embodiment, please refer to Figure 5 and Figure 7 The inner wall of the cavity 12a is provided with a conductive post 122. The conductive post 122 is located on the side of the cavity 12a away from its opening and is electrically connected to the electrochemical measuring instrument 4. The working electrode 3 is provided with a plug hole 3a corresponding to the conductive post 122, and the plug hole 3a is for inserting the conductive post 122.

[0056] In this embodiment, when the working electrode 3 is inserted into the workpiece box 12, the conductive post 122 is inserted into the insertion hole 3a of the working electrode 3, so as to realize the rapid connection of the working electrode 3 to the test system and improve the convenience of testing.

[0057] In one embodiment, the surface of the working electrode 3 is composed of a reaction zone and an isolation zone, with the reaction zone facing the connection port 12b; the concrete rust inhibitor electrochemical testing system also includes an isolation film layer covering the isolation zone.

[0058] In this embodiment, the working electrode 3 is sealed by an isolation membrane layer, exposing only a fixed test area. This means that only the reaction zone can contact the simulated pore liquid through the connecting port 12b, thus improving test accuracy. It should be noted that the isolation membrane layer can be one of a rubber layer, a silicone layer, or an epoxy resin layer. In this embodiment, the isolation membrane layer is an epoxy resin layer.

[0059] In one embodiment, the electrochemical testing system for concrete rust inhibitors further includes a temperature control device 5 and a reference electrode 6. The temperature control device 5 is thermally connected to the solution tank 11, and the reference electrode 6 is at least partially located within the cavity 11a and electrically connected to the electrochemical measuring instrument 4. It should be noted that in this design, the reference electrode 6 is a dual-salt bridge reference electrode 6, and the cover plate also has holes for the reference electrode 6 to pass through.

[0060] In this embodiment, the testing system also includes a temperature control device 5 to ensure that the simulated pore liquid is kept at a constant temperature, thereby improving measurement accuracy. Simultaneously, a reference electrode 6 is provided as a reference standard for the working electrode 3, further improving measurement accuracy. It should be noted that the temperature control device 5 is an external temperature control device of the solution tank 11, and can be one of a water bath temperature control device, an alcohol lamp heating device, or an electric heating device.

[0061] To better understand this utility model, the following is combined with... Figures 1 to 7 The technical solution of this utility model is described in detail below:

[0062] In this design, the working electrode 3, auxiliary electrode 2, and reference electrode 6 are connected to the electrochemical workstation via wires. The solution tank 11 contains simulated pore liquid, and the temperature of the simulated pore liquid is controlled by the temperature control device 5. The auxiliary electrode 2 and the reference electrode 6 are inserted into the simulated pore liquid and fixed by a cover plate. The working electrode 3 is fixed and replaced by the workpiece box 12 and the locking structure 15.

[0063] The working electrode 3 is a steel bar test block that has been cut and ground to a specified roughness. It is connected to the wire using conductive tape and sealed with epoxy resin, exposing only a fixed test area.

[0064] The simulated pore fluid was a mixed solution of calcium hydroxide, sodium chloride, and concrete rust inhibitor. The dosages of calcium hydroxide and sodium chloride were 0.6% and 3.5% respectively, referring to the test method for the percentage of steel corrosion area in a wet-dry cycle environment of brine in JT / T537. The dosage of rust inhibitor was its recommended dosage.

[0065] In use, first pour the prepared simulated pore liquid into the electrolytic cell. Insert the auxiliary electrode 2 and reference electrode 6 into the solution tank 11 through the cover plate. Fix the working electrode 3 through the workpiece box 12 and the locking structure 15. Connect each electrode to the electrochemical workstation through wires. After turning on the heating device to keep the temperature of the simulated pore liquid constant, use the electrochemical workstation to perform corresponding tests, such as linear polarization and AC impedance tests. Determine the rust-inhibiting performance of the concrete rust inhibitor based on the test results, and refer to the results to conduct the percentage ratio test of steel corrosion area in the brine dry-wet cycle environment in JT / T537. After the test is completed, remove the working electrode 3 from the workpiece box 12 and replace it to conduct the next set of experiments.

[0066] The electrochemical workstation, in conjunction with the three-electrode testing system, can easily and quickly detect various electrochemical properties of concrete rust inhibitors. It can also compare and verify the results with other control experiments by adjusting the proportions of various substances in the simulated pore liquid. At the same time, the system can quickly replace the steel bar electrodes used for testing and maintain a constant temperature of the simulated pore liquid, which facilitates rapid experimental work for researchers and reduces experimental errors.

[0067] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. An electrochemical testing system for concrete rust inhibitors, characterized in that, include: An electrolysis tank includes a solution tank, a workpiece box, and a cover. The solution tank has a cavity with an opening on one side, and the workpiece box has a container with an opening on one side and a communication port connecting the container and the cavity. The cover connects to the solution tank and closes the opening of the cavity. The auxiliary electrode is at least partially located within the cavity; The working electrode is fitted into the cavity and the communication port is blocked; and An electrochemical measuring instrument is electrically connected to both the auxiliary electrode and the working electrode.

2. The electrochemical testing system for concrete rust inhibitors according to claim 1, characterized in that, The electrolysis box also includes an elastic element and a locking structure. The elastic element connects the working electrode and the inner wall of the cavity, and is used to drive the working electrode to pop out from the opening of the cavity. The locking structure is located in the workpiece box and can lock the working electrode in the workpiece box and can unlock the working electrode.

3. The electrochemical testing system for concrete rust inhibitors according to claim 2, characterized in that, The locking structure includes a mounting shaft and a locking plate. The mounting shaft is rotatably mounted on the workpiece box and located at the opening end of the cavity. The locking plate is connected to the mounting shaft and can extend into and out of the opening of the cavity when rotating with the mounting shaft.

4. The electrochemical testing system for concrete corrosion inhibitors according to claim 3, characterized in that, The locking plate has anti-slip stripes on the side away from the cavity.

5. The electrochemical testing system for concrete rust inhibitors according to claim 2, characterized in that, The elastic element includes a compression spring, which connects the working electrode and the inner wall of the cavity.

6. The electrochemical testing system for concrete rust inhibitors according to claim 5, characterized in that, The inner wall of the cavity is provided with a mounting platform, which is located on the side of the communication port near the opening of the cavity; The working electrode is provided with a mating platform corresponding to the mounting platform. The mating platform is located on the side of the mounting platform away from the communication port. The compression spring connects the mounting platform and the mating platform.

7. The electrochemical testing system for concrete rust inhibitors according to claim 6, characterized in that, The electrolysis tank also includes a sealing ring, which is installed on the inner wall of the cavity and located between the mounting platform and the communication port, and is placed on the side of the working electrode near the communication port.

8. The electrochemical testing system for concrete rust inhibitors according to claim 1, characterized in that, The inner wall of the cavity is provided with a conductive post, which is located on the side of the cavity away from its opening and is electrically connected to the electrochemical measuring instrument. The working electrode has a insertion hole corresponding to the conductive post, and the insertion hole is for inserting the conductive post.

9. The electrochemical testing system for concrete rust inhibitors according to claim 1, characterized in that, The surface of the working electrode has a reaction zone and an isolation zone, with the reaction zone directly opposite the communication port; The electrochemical testing system for concrete rust inhibitors also includes an isolation membrane layer covering the isolation area.

10. The electrochemical testing system for concrete rust inhibitors according to claim 1, characterized in that, The electrochemical testing system for concrete rust inhibitors also includes a temperature control device and a reference electrode. The temperature control device is thermally connected to the solution tank, and the reference electrode is at least partially located within the cavity and electrically connected to the electrochemical measuring instrument.

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