Intelligent integrated electrochemical dry-wet cycle accelerated corrosion test device

Abstract

This utility model discloses an intelligent integrated electrochemical dry-wet cycle accelerated corrosion testing device, belonging to the field of reinforced concrete corrosion testing equipment. It includes a test chamber body and a DC power supply. The test chamber body has a test area, with at least one test rack within the test area. Multiple atomizing nozzles are located above the test racks, and fans are installed on the side walls of the test area. Specimens are placed on the test racks, and stainless steel wire is wound around the surface of the specimens. The positive terminal of the DC power supply is connected to the end of the reinforcing steel bar inside the specimen, and the negative terminal is connected to one end of the stainless steel wire. This utility model combines electrochemical acceleration and dry-wet cycle functions, has a high degree of intelligence, can simulate a real corrosion environment, significantly improves testing efficiency and result reliability, and is suitable for the study of corrosion performance of various materials and components.

Description

Technical Field

[0001] This utility model relates to the field of material corrosion testing equipment, and in particular to an intelligent integrated electrochemical dry-wet cycle accelerated corrosion testing device. Background Technology

[0002] In real-world engineering environments, steel reinforcement and concrete work together. Generally, reinforced concrete members operate with cracks. Over time, exposed steel reinforcement corrodes, leading to concrete cracking and spalling, which negatively impacts the load-bearing capacity of the member. Current research indicates that steel corrosion is a significant factor contributing to the decrease in the load-bearing capacity of reinforced concrete members.

[0003] In real life, the reinforced concrete components we see are mostly large buildings with very long design lifespans, which makes it difficult to conduct experiments to explore their characteristics. Therefore, most existing reinforced concrete corrosion test devices are scaled-down versions of actual models, and then simulate the natural environment to promote steel corrosion.

[0004] Using a salt solution as an electrolyte, when a crack penetrates the concrete and steel reinforcement surface, the salt solution can directly reach the steel reinforcement surface, and the corrosion products can easily seep out with the solution, thereby reducing the stress of the corrosion products on the concrete around the steel reinforcement. This is quite different from the actual engineering environment.

[0005] Traditional natural environment corrosion tests are time-consuming and cannot meet the needs of rapid research on material corrosion performance. Generally, methods for studying the corrosion of reinforced concrete include physical methods, analytical methods, and electrochemical detection methods, with electrochemical detection being the most commonly used method by researchers. Although electrochemical accelerated corrosion methods can shorten the time to some extent, they have limitations, such as the inability to accurately simulate the wet-dry cycle conditions in real-world environments, and insufficient precision and intelligence in controlling various parameters during the test. Existing test devices are often single-function and require frequent manual intervention, resulting in low experimental efficiency and difficulty in guaranteeing the accuracy and repeatability of test results. Therefore, it is necessary to design a test device that combines electrochemical corrosion with wet-dry cycling and achieves intelligent integrated control. Utility Model Content

[0006] The purpose of this invention is to provide an intelligent integrated electrochemical dry-wet cycle accelerated corrosion test device to solve the problem that existing corrosion test devices cannot well simulate the dry-wet cycle conditions in the actual environment, thereby improving test efficiency and ensuring the accuracy and repeatability of test results.

[0007] This utility model is achieved through the following technical solution: An intelligent integrated electrochemical dry-wet cycle accelerated corrosion test device includes a test chamber body and a DC power supply; The test chamber has a test area inside, and the test area has at least one test rack. Multiple atomizing nozzles are provided above the test rack, and a fan is provided on the side wall of the test area. The test specimen is placed on the test frame, and stainless steel wire is wound around the surface of the specimen. The positive terminal of the DC power supply is connected to the end of the reinforcing bar inside the specimen, and the negative terminal is connected to one end of the stainless steel wire.

[0008] Furthermore, the test area is equipped with 2-4 layers of test racks, and the fans are installed on the left side wall of the test area. The fans are arranged in groups of two, and each group of fans corresponds to one layer of test racks. The top of the test area is fixed with horizontally distributed spray bars, which are equipped with electromagnetic valves and multiple atomizing nozzles are mounted on the side walls of the spray bars.

[0009] Furthermore, the main body of the test chamber is equipped with a control area above the test area, and a liquid storage tank is provided in the control area, which is connected to the spray bar; A control panel is located on the outside of the control area.

[0010] Furthermore, the main body of the test chamber is equipped with a recycling area below the test area, and the recycling area is equipped with a recycling box. The top of the recycling box is open for recycling the electrolyte in the test area.

[0011] Furthermore, a water pump and a recovery pipe are connected sequentially to the bottom outer side of the recovery box, and the recovery pipe is connected to the liquid storage tank; The recycling bin is equipped with a liquid level sensor, and a filter screen is laid at the bottom of the recycling bin.

[0012] Furthermore, the outer side of the stainless steel wire includes an absorbent sponge.

[0013] Furthermore, the stainless steel wire is wound at equal intervals around the surface of the specimen.

[0014] Compared with the prior art, this utility model has the following advantages: 1. By using atomizing nozzles and fans, a dry-wet corrosion cycle of the specimen can be achieved within a set time interval. By setting the number of cycles to be performed and the time required for a single cycle, intelligent dry-wet cycle accelerated corrosion of the specimen can be achieved. This invention can effectively simulate the wet and dry cycle conditions in the actual environment, improve the efficiency of the test, and ensure the accuracy and repeatability of the test results. 2. To ensure uniform corrosion of the specimen, this utility model makes the following two guarantees: First, the electrolyte is sprayed evenly on the surface of the specimen through an atomizing nozzle; second, the specimen is wrapped with an absorbent sponge, and the electrolyte is first sprayed onto the sponge and then evenly diffused onto the surface of the specimen. 3. This utility model features a liquid storage tank and a recovery tank at the top and bottom of the test area, connected as a whole by an atomizing nozzle, a water pump, and water pipes. Combined with a fan, it can achieve one dry-wet corrosion cycle of the specimen within a set time interval. Furthermore, by setting the number of cycles to be performed and the time required for each cycle via the control panel, intelligent dry-wet cycle corrosion of the specimen can be achieved. In addition, the electrolyte supply and recovery of this utility model are integrated, requiring only periodic addition or replacement of the electrolyte, making it simple to operate and highly practical. 4. This invention features high integration. Compared to traditional dry-wet cycle and corrosion devices, this device combines corrosion and dry-wet cycles, shortening the testing time and offering convenient operation. It can more realistically simulate corrosion conditions in actual environments, improving the reliability of test results. It can meet the testing requirements of different electrolytic environments, corrosion cycles, and different types of specimens and materials. 5. This utility model has an embedded temperature and humidity meter, which can monitor the environmental changes in the test area in real time from the control panel. Adjustments can be made in a timely manner according to the test plan to ensure the accuracy and reliability of the test. 6. The recycling bin of this utility model is equipped with a liquid level sensor. When the water level in the recycling bin is above the sensor position, the water pump at the bottom of the recycling bin starts to work and pumps the electrolyte in the bin to the storage tank. This process is repeated, which can realize the recycling of electrolyte to a certain extent. Attached Figure Description

[0015] Figure 1 This is an isometric view of the main body of the test chamber described in this utility model; Figure 2 for Figure 1 Internal diagram; Figure 3 This is a front view of the main body of the test chamber described in this utility model; Figure 4 for Figure 3 Internal diagram; Figure 5 This is a schematic diagram showing the fit between the specimen and the stainless steel wire; Figure 6 This is a schematic diagram of the recycling bin described in this utility model; In the diagram: 1. Main body of the test chamber; 2. DC power supply; 3. Control area; 4. Test area; 5. Recovery area; 6. Storage tank; 7. Control panel; 8. Atomizing nozzle; 9. Solenoid valve; 10. Fan; 11. Recovery tank; 12. Water pump; 13. Liquid level sensor; 14. Filter screen; 15. Stainless steel wire; 16. Absorbent sponge; 17. Reinforcing steel; 18. Specimen body. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figure 1-6 As shown in the figure, this embodiment of an intelligent integrated electrochemical dry-wet cycle accelerated corrosion test device includes a test chamber body 1 and a DC power supply 2. The test chamber body 1 is divided into three parts from top to bottom: a control area 3, a test area 4 (also known as an electrolysis layer), and a recovery area 5. A liquid storage tank 6 is installed in the control area 3, and a control panel 7 is installed on the outside of the control area 3. The control panel 7 is a conventional controller integration, which can integrate dry-wet cycle control, temperature and humidity monitoring, and voltage and current regulation functions. The test area 4 contains two layers of test racks distributed vertically, which can hold different types of test specimens 18.

[0017] A horizontally distributed spray bar is fixed at the top of the test area 4. A solenoid valve 9 is installed at the inlet end of the spray bar and connected to the bottom of the liquid storage tank 6. Multiple atomizing nozzles 8 are assembled on the side wall of the spray bar. The solenoid valves 9 are electrically connected to and controlled by the control panel 7. Four fans 10 are installed on the left side wall of the test area 4. The fans 10 are arranged in groups of two, with each group of fans corresponding to one layer of the test frame. The fans 10 are electrically connected to and controlled by the control panel 7.

[0018] The recovery zone 5 consists of a recovery tank 11, a water pump 12, and a level sensor 13. The top of the recovery tank 11 is open for recovering the electrolyte in the test zone 4. The bottom outer side of the recovery tank 11 is connected to the water pump 12 and the recovery pipe, which is connected to the storage tank 6. A filter screen 14 is installed at the bottom inside the recovery tank 11 to prevent corrosion products from clogging the water pump. A thermometer and a hygrometer are also installed inside the main body 1 of the test chamber to monitor the temperature and humidity of the test zone, respectively.

[0019] like Figure 5 As shown, the specimen 18 contains reinforcing bars 17 inside. The specimen 18 is placed on a test frame, and stainless steel wire 15 is wound around its surface. During installation, the positive terminal of the DC power supply 2 is connected to the end of the reinforcing bars 17 inside the specimen 18, and the negative terminal is connected to one end of the stainless steel wire 15, thus forming the entire electrolytic circuit. Furthermore, a layer of absorbent sponge 16 is wrapped around the outside of the stainless steel wire 15, allowing the electrolyte to penetrate evenly into the surface of the specimen 18, ensuring uniform corrosion.

[0020] The specific operation of the intelligent integrated electrochemical dry-wet cycle accelerated corrosion testing device described in this embodiment is as follows: 1. For the embedded rebar specimen 18, first insert the rebar into the mold and fix it, then pour the prepared concrete to form the embedded rebar specimen 18. After the initial setting of the specimen 18, demold it, and then cure it according to the standard requirements for 28 days before testing. 2. Prepare different types and concentrations of electrolytes according to the test requirements, such as 5% NaCl / Na2SO4 solution, etc. For specimen 18, first wrap stainless steel wire 15 around the surface of specimen 18 at certain intervals, and also tie stainless steel wire 15 to the end of the reinforcing bar 17. If there are multiple specimens 18 on the same layer of the test rack, connect the specimens 18 on the same layer in series according to the wiring method of connecting the first and second ends. Finally, connect the two ends to the positive and negative terminals of the DC power supply respectively to form a circuit; 3. Wrap the stainless steel wire 15 around the specimen 18 and evenly wrap the water-absorbing sponge 16 around its outside to ensure that the electrolyte can reach the surface of the specimen 18 evenly, and at the same time reduce the evaporation of water that leads to salt precipitation. 4. Check whether the test device is working properly, clean the residue and filter screen 14 in the device, add the prepared electrolyte to the storage tank 6 after cleaning, then put the test piece 18 into the test frame, and connect the positive and negative terminals to the connectors on the control panel 7 respectively. 5. After checking that everything is correct, start the atomizing nozzle on the control panel to spray the solution, ensuring that the electrolyte can wet the absorbent sponge 16 first to prevent the surface of the specimen 18 from drying out. After powering on, ignite the absorbent sponge 16. 6. After the surface of specimen 18 is completely wetted, turn on the DC power supply through control panel 7, select constant current or constant voltage mode for power supply, and begin the corrosion process. During the experiment, check control panel 7 regularly to observe whether the current or voltage is stable. If abnormal current or voltage occurs, check the circuit in time, troubleshoot the fault, and continue to power on to ensure that the entire test process proceeds normally. 7. During the test, set the number of wet and dry cycles and the drying time of each spray of electrolyte and blower 10 on the control panel 7. Observe the progress of the test regularly and record it. Adjust the rust rate scheme in real time according to the theoretical calculation. In this step, the dry-wet cycle includes a dry cycle and a wet cycle. The dry cycle involves stopping the atomizing nozzles after spraying the electrolyte and then activating a fan to simulate the evaporation of moisture from the structure's surface after rain, as in natural conditions. The wet cycle involves turning on the atomizing nozzles to spray the electrolyte, simulating the corrosion of the structure by corrosive ions in rainwater. The interval between the two processes is set via a control panel to achieve this dry-wet cycle, simulating the corrosion of the structure by corrosive ions in rainy or snowy weather. 8. Regularly check the consumption of electrolyte and the recovery of electrolyte in the recovery tank, replenish electrolyte in a timely manner and clean the rust products in the recovery tank to avoid clogging the filter screen and interrupting the electrolyte circulation; 9. Throughout the entire test, the corrosion potential and corrosion current data of specimen 18 are collected in real time and transmitted to control panel 7. Control panel 7 processes and stores the data and displays it in real time on the control panel screen. Test personnel can view the test data at any time and can also transmit the data to an external computer for further analysis and processing; 10. When the test reaches the set duration or the degree of corrosion of specimen 18 reaches the expected requirements, stop the test device, take out specimen 18 and carry out subsequent analysis and testing.

Claims

1. An intelligent integrated electrochemical dry-wet cycle accelerated corrosion testing device, characterized in that, It includes the test chamber body (1) and DC power supply (2); The test chamber body (1) is provided with a test area (4), and the test area (4) is provided with at least one test rack. Multiple atomizing nozzles (8) are provided above the test rack, and a fan (10) is provided on the side wall of the test area (4). The test stand has a specimen (18) placed on it. The surface of the specimen (18) is wrapped with stainless steel wire (15). The positive terminal of the DC power supply (2) is connected to the end of the steel bar (17) inside the specimen (18), and the negative terminal is connected to one end of the stainless steel wire (15).

2. The intelligent integrated electrochemical dry-wet cycle accelerated corrosion test device according to claim 1, characterized in that, The test area (4) is equipped with 2-4 layers of test racks. The fan (10) is set on the left side wall of the test area (4). The fan (10) is used in groups of two, and each group of fans (10) corresponds to one layer of test rack. The top of the test area (4) is fixed with horizontally distributed spray bars, and the spray bars are equipped with electromagnetic valves (9), and multiple atomizing nozzles (8) are assembled on the side wall of the spray bars.

3. The intelligent integrated electrochemical dry-wet cycle accelerated corrosion test device according to claim 2, characterized in that, The test chamber body (1) is also provided with a control area (3) above the test area (4), and a liquid storage tank (6) is provided in the control area (3), and the liquid storage tank (6) is connected to the spray bar; A control panel (7) is provided on the outside of the control area (3).

4. The intelligent integrated electrochemical dry-wet cycle accelerated corrosion test device according to claim 3, characterized in that, The test chamber body (1) is provided with a recycling area (5) below the test area (4). The recycling area (5) is provided with a recycling box (11). The top of the recycling box (11) is open for recycling the electrolyte in the test area (4).

5. The intelligent integrated electrochemical dry-wet cycle accelerated corrosion test device according to claim 4, characterized in that, The bottom outer side of the recovery tank (11) is connected to a water pump (12) and a recovery pipe, and the recovery pipe is connected to the liquid storage tank (6). The recycling bin (11) is equipped with a liquid level sensor (13), and a filter screen (14) is laid at the bottom of the recycling bin (11).

6. The intelligent integrated electrochemical dry-wet cycle accelerated corrosion testing device according to any one of claims 2-5, characterized in that, The outer side of the stainless steel wire (15) includes an absorbent sponge (16).

7. The intelligent integrated electrochemical dry-wet cycle accelerated corrosion test device according to claim 6, characterized in that, The stainless steel wire (15) is wound at equal intervals around the surface of the specimen (18).

8. The intelligent integrated electrochemical dry-wet cycle accelerated corrosion testing device according to any one of claims 2-5, characterized in that, The test chamber body (1) is equipped with a thermometer and a hygrometer.

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