A stress corrosion concentration maintaining device

Abstract

This utility model relates to the field of materials testing and discloses a stress corrosion concentration maintaining device, including a corrosion tank and a stress corrosion concentration maintaining mechanism for it. The corrosion tank is divided into an inner layer and an outer layer. A receiving tank for recovering leaked corrosive liquid generated during the test is provided below the corrosion tank. The concentration maintaining mechanism includes a support frame with five layers from bottom to top, with the bottom layer serving as the first layer. The first layer of the support frame is equipped with a waste liquid recovery component. In this utility model, by setting up the stress corrosion concentration maintaining mechanism, a stable medium solution can be provided to the inner and outer layers of the corrosion tank, thereby ensuring the concentration of the corrosive liquid when the sample is immersed in the corrosive liquid for a long time during testing, thus improving the reliability of the test data for the materials in service. The device provides two modes: a circulating corrosion liquid mode and a replenishment mode, allowing users to select the appropriate corrosion liquid mode according to their needs.

Description

Technical Field

[0001] This utility model relates to the field of materials testing, and in particular to a stress corrosion concentration maintaining device. Background Technology

[0002] The stress corrosion concentration maintenance device is a device that provides a stable corrosion environment for the testing machine. It is mainly used to measure various data of metallic materials and composite materials under slow stress corrosion.

[0003] Existing testing equipment suffers from several problems. When samples are immersed in corrosive solutions for extended periods, electrochemical reactions between the corrosive solution and the samples can cause changes in the concentration of the corrosive solution, leading to unreliable test data for in-service materials. Furthermore, some existing testing equipment cannot preheat the corrosive solution, and directly injecting room-temperature solutions into the corrosion tank poses a risk of temperature shock, making it impractical. Therefore, a stress corrosion concentration maintenance device is proposed to address these issues. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a stress corrosion concentration maintaining device, which aims to improve the problem in the prior art where, when a sample is immersed in a corrosive solution for a long time during testing, the electrochemical reaction between the corrosive solution and the sample causes changes in the concentration of the corrosive solution, resulting in unreliable test data for materials in service.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a stress corrosion concentration maintaining device, comprising a corrosion tank and a stress corrosion concentration maintaining mechanism thereon, wherein the corrosion tank is divided into an inner layer and an outer layer, and a liquid receiving tank for recovering leaked corrosive liquid generated during the test is provided below the corrosion tank; the concentration maintaining mechanism includes a support frame, wherein the support frame is provided with a total of five layers from bottom to top, wherein the bottom layer of the support frame is the first layer, the first layer of the support frame is provided with a waste liquid recovery component, the second layer of the support frame is provided with a liquid pipeline connection component, the third layer of the support frame is provided with a corrosive liquid storage component, the fourth layer of the support frame is provided with an inner layer preheating component, and the fifth layer of the support frame is provided with an outer layer preheating component.

[0006] As a further description of the above technical solution:

[0007] The waste liquid recycling assembly includes a waste liquid tank 1 located on the left side of the first layer and a waste liquid tank 2 located on the right side of the first layer.

[0008] As a further description of the above technical solution:

[0009] The liquid pipeline connection assembly includes a liquid pipeline front panel, solenoid valve one, solenoid valve two, pump one for draining liquid from the outer layer of the corrosion tank, and pump two for draining liquid from the inner layer of the corrosion tank.

[0010] As a further description of the above technical solution:

[0011] The corrosion liquid storage assembly includes a corrosion liquid holding tank and a pump for supplying the corrosion liquid holding tank.

[0012] As a further description of the above technical solution:

[0013] The inner preheating assembly consists of a corrosion liquid preheating tank, a pump for supplying the corrosion liquid to the corrosion tank, a filtration device for filtering the corrosion liquid, an electric heating tube, a PT100 thermocouple, and a float switch.

[0014] As a further description of the above technical solution:

[0015] The outer preheating assembly includes a water preheating tank and a pump (5) for supplying water to the outer layer of the corrosion tank, a PT100 thermocouple (2), an electric heating tube (2), and a float switch (3).

[0016] As a further description of the above technical solution:

[0017] The inner layer of the corrosion tank includes a PT100 thermocouple, a float switch, and an inner layer drain port.

[0018] As a further description of the above technical solution:

[0019] The outer layer of the corrosion tank includes a float switch, an electric heating tube, and an outer drain outlet.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, by setting a stress corrosion concentration maintenance mechanism, a stable medium solution can be provided to the inner and outer layers of the corrosion tank respectively, thereby ensuring the concentration of the corrosion solution when the sample is immersed in the corrosion solution for a long time for testing, thereby improving the reliability of the test data of the material in service. The device provides two modes: circulating corrosion solution mode and replenishment mode, and the user can select the corrosion solution mode according to the needs.

[0022] 2. In this utility model, by setting a preheating component, the solution entering the inner and outer layers of the corrosion tank can be preheated, thereby effectively avoiding the temperature shock problem caused by temperature difference and effectively improving the practicality of the device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a stress corrosion concentration maintaining device proposed in this utility model.

[0024] Figure 2 This is a three-dimensional structural diagram of the corrosion solution concentration maintaining mechanism of the stress corrosion concentration maintaining device proposed in this utility model;

[0025] Figure 3 This is a schematic diagram of a stress corrosion concentration maintaining device proposed in this utility model.

[0026] Legend:

[0027] 1. Float switch one; 2. PT100 thermocouple one; 3. Float switch two; 4. Corrosion tank; 5. Electric heating element one; 6. Liquid receiving tank; 7. PT100 thermocouple two; 8. Float switch three; 9. Water preheating tank; 10. Electric heating element two; 11. Pump five; 12. Float switch four; 13. PT100 thermocouple three; 14. Electric heating element three; 15. Corrosion liquid preheating tank; 16. Filtration equipment; 17. Pump four; 18. Corrosion liquid holding tank; 19. Pump three; 20. Solenoid valve one; 21. Pump two; 22. Pump one; 23. Solenoid valve two; 24. Waste liquid tank one; 25. Waste liquid tank two; 26. Support frame. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Reference Figures 1-3 This utility model provides an embodiment of a stress corrosion concentration maintaining device, including a corrosion tank 4 and a stress corrosion concentration maintaining mechanism equipped thereon. The main structure of this device is controlled by a control system, which is divided into two parts: host control and temperature control. The host control part uses a PLC controller to control the start and stop of the peristaltic pump, the opening and closing of the solenoid valve, and other actions to realize the process action. The temperature control uses a temperature controller to control the phase-shift triggering of a solid-state relay. Compared with the zero-crossing triggering method of solid-state relays, the phase-shift triggering has less impact on the load, better ensures the service life of the electric heating tube, and ensures the stability of the heating process.

[0030] Furthermore, the corrosion tank 4 is divided into an inner layer and an outer layer, and the corrosion tank 4 is divided into an inner layer solution and an outer layer solution. The inner layer is a corrosive liquid, and the outer layer is a water-heated solution. The stress corrosion concentration maintaining device can provide a stable medium solution for the inner layer and the outer layer of the corrosion tank 4 respectively. A receiving tank 6 is set below the corrosion tank 4 for recovering the corrosive liquid leaked during the test. The inner layer of the corrosion tank 4 includes a PT100 thermocouple 2, a float switch 1, and an inner layer drain port of the corrosion tank 4. The outer layer of the corrosion tank 4 includes a float switch 3, an electric heating tube 5, and an outer layer drain port.

[0031] Furthermore, the concentration maintaining mechanism includes a support frame 26, which is made of aluminum alloy. The support frame 26 has five layers from bottom to top. The bottom layer of the support frame 26 is the first layer. The first layer of the support frame 26 is equipped with a waste liquid recovery component, which is mainly used for the recovery of waste liquid in the corrosion tank 4 and the liquid receiving tank 6. The second layer of the support frame 26 is equipped with a liquid pipeline connection component, which is used to facilitate the drainage of the solution in the corrosion tank 4. The third layer of the support frame 26 is equipped with a corrosion liquid storage component, which is used to pass room temperature corrosion liquid to the components of the fourth layer. The fourth layer of the support frame 26 is equipped with an inner layer preheating component, which is used to preheat the inner layer corrosion liquid. The fifth layer of the support frame 26 is equipped with an outer layer preheating component, which is used to provide preheated water bath liquid to the outer layer.

[0032] See Figures 2-3 The first layer of waste liquid recovery components includes a waste liquid tank 24 located on the left side of the first layer and a waste liquid tank 25 located on the right side of the first layer. The second layer of liquid pipeline connection components includes a liquid pipeline front panel, a solenoid valve 20, a solenoid valve 23, a pump 22 for draining the outer layer of the corrosion tank 4, and a pump 21 for draining the inner layer of the corrosion tank 4. The liquid pipeline front panel is connected to each layer through pipelines and is finally connected to the corrosion tank 4. The normally closed solenoid valves prevent the corrosion tank 4 from siphoning back. The inner and outer layer drain pumps of the corrosion tank 4 can both drain and circulate liquid.

[0033] Furthermore, the third-layer corrosion solution storage assembly includes a corrosion solution tank 18 and a third pump 19 for supplying the corrosion solution to the tank 4, used for the storage and transportation of the corrosion solution. The fourth-layer inner preheating assembly consists of a corrosion solution preheating tank 15, a fourth pump 17 for supplying the corrosion solution to the corrosion tank 4, a filter device 16 for filtering the corrosion solution, and an electric heating element 14, a PT100 thermocouple 13, and a float switch 12. The structure of the fourth layer is to provide preheated corrosion solution to the inner layer of the corrosion tank 4, which is achieved by passing the room-temperature corrosion solution from the third layer through the corrosion solution preheating tank 15. After preheating, the solution is added to the inner layer of the corrosion tank 4. The corrosion filtration device 16 installed in this layer can filter metal residues when the device is in circulation mode, so as to ensure that the corrosion solution is free of impurities. The outer layer preheating components of the fifth layer include a water preheating tank 9 and a pump 11, a PT100 thermocouple 7, an electric heating tube 10, and a float switch 8 for supplying water to the outer layer of the corrosion tank 4. It is mainly used to provide preheated water bath solution to the outer layer of the corrosion tank 4. This device is also equipped with a manual drain valve. When the pipeline is blocked or manual draining is required, the liquid can be drained through the manual drain valve.

[0034] Working principle: When the system is set to circulation mode, all pumps are in the off state and the manual valve is in the off state. Before the test, add the prepared solution of a specific concentration to the corrosion tank 4 and the corrosion liquid preheating tank 15, and add water to the water preheating tank 9. The inner and outer layers of the corrosion tank 4 on the testing machine can be filled with solution through the operation control system or manually.

[0035] Then, the control system turns on pump 21 and solenoid valve 20, allowing the liquid flowing from the inner layer of corrosion tank 4 into corrosion solution tank 18. At this time, the manual drain valve is closed. The PLC control system turns on pump 319, allowing the solution in corrosion solution tank 18 to flow into corrosion solution preheating tank 15. The PLC controls the electric heating tube in corrosion solution preheating tank 15 to keep or heat the solution in corrosion solution preheating tank 15. The PLC control system turns on pump 417, allowing the solution of a certain concentration that has been heated to the specified temperature in corrosion solution preheating tank 15 to flow into corrosion tank 4. After the solution in corrosion solution preheating tank 15 has completely flowed into the inner layer of corrosion tank 4, the PLC control system turns on pump 511, allowing the solution of a certain concentration that has been heated to the specified temperature in water preheating tank 9 to flow into the outer layer of corrosion tank 4. After the solution in water preheating tank 9 has completely flowed into the inner layer of corrosion tank 4, the stress corrosion test begins.

[0036] When the set solution replacement time arrives, the operation of turning on pump 21, pump 319, and pump 417 is performed sequentially. In this way, during long-term stress corrosion testing, the solution in corrosion tank 4 can be replaced multiple times, allowing the sample to undergo stress corrosion testing in a solution of a specified concentration. When the testing machine ends, the control system can be manually operated to turn on pump 122 and solenoid valve 23, allowing the water in the outer layer of corrosion tank 4 to flow into waste liquid tank 25. The liquid in the inner layer of corrosion tank 4 needs to be manually connected to drain tank 1.

[0037] When set to replenishment mode, when the inner float switch 1 of the corrosion tank 4 triggers a low-liquidity signal, the PLC control system automatically activates pump 17 to heat the corrosion solution in the corrosion solution tank 18 to the preset position of float switch 11. When the outer float switch 3 of the corrosion tank 4 triggers a low-liquidity signal, the PLC control system automatically activates pump 11 to heat the corrosion solution in the corrosion solution tank 18 to the preset position of float switch 3, ensuring that the corrosion solution fluctuates within the standard allowable range during the test. When the liquid in the water preheating tank 9 is insufficient, float switch 8 will prompt for manual addition of water solution. When the liquid in the corrosion solution preheating tank 15 is insufficient, reaching the preset position of float switch 12, the PLC control system activates pump 19 to replenish the corrosion solution in the corrosion solution tank 18 to the corrosion solution preheating tank 15.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stress corrosion concentration maintaining device, comprising a corrosion tank (4) and a stress corrosion concentration maintaining mechanism thereon, characterized in that: The corrosion tank (4) is divided into an inner layer and an outer layer. A receiving tank (6) for recovering leaked corrosive liquid generated during the test is provided below the corrosion tank (4). The concentration maintenance mechanism includes a support frame (26). The support frame (26) has five layers from bottom to top. The bottom layer of the support frame (26) is the first layer. The first layer of the support frame (26) is provided with a waste liquid recovery component. The second layer of the support frame (26) is provided with a liquid pipeline connection component. The third layer of the support frame (26) is provided with a corrosive liquid storage component. The fourth layer of the support frame (26) is provided with an inner layer preheating component. The fifth layer of the support frame (26) is provided with an outer layer preheating component.

2. The stress corrosion concentration maintaining device according to claim 1, characterized in that: The waste liquid recycling assembly includes a waste liquid tank 1 (24) located on the left side of the first layer and a waste liquid tank 2 (25) located on the right side of the first layer.

3. The stress corrosion concentration maintaining device according to claim 1, characterized in that: The liquid pipeline connection assembly includes a liquid pipeline front panel, a solenoid valve one (20), a solenoid valve two (23), a pump one (22) for draining the outer layer of the corrosion tank (4), and a pump two (21) for draining the inner layer of the corrosion tank (4).

4. The stress corrosion concentration maintaining device according to claim 1, characterized in that: The corrosion liquid storage assembly includes a corrosion liquid holding tank (18) and a three-stage (19) supply pump for the corrosion liquid holding tank (4).

5. The stress corrosion concentration maintaining device according to claim 1, characterized in that: The inner preheating assembly consists of a corrosion liquid preheating tank (15), a pump four (17) for supplying liquid to the corrosion tank (4), a filter device (16) for filtering the corrosion liquid, an electric heating tube three (14), a PT100 thermocouple three (13), and a float switch four (12).

6. The stress corrosion concentration maintaining device according to claim 1, characterized in that: The outer preheating assembly includes a water preheating tank (9) and a pump five (11) that supplies water to the outer layer of the corrosion tank (4), a PT100 thermocouple two (7), an electric heating tube two (10), and a float switch three (8).

7. The stress corrosion concentration maintaining device according to claim 1, characterized in that: The inner layer of the corrosion tank (4) includes a PT100 thermocouple (2), a float switch (1), and an inner layer drain port of the corrosion tank (4).

8. The stress corrosion concentration maintaining device according to claim 1, characterized in that: The outer layer of the corrosion tank (4) includes a float switch (3), an electric heating tube (5), and an outer drain port.

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