Acid resistance testing device and method
By designing an acid resistance testing device, an acidic environment is simulated to evaluate the acid resistance of materials, which solves the shortcomings of existing testing methods and achieves more accurate performance evaluation and improved safety.
Patent Information
- Application Number
- CN202511929698.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-03-03
AI Technical Summary
Existing methods for testing the acid resistance of acid-resistant materials cannot fully assess the actual structural loss of materials in acidic environments and pose safety risks.
An acid resistance testing device was designed, including a test vessel, a storage tank, an acid gas absorption pool, an acid recovery pool, a heater, a sample holder, and a weighing device. By simulating an acidic liquid or gas environment, the acid resistance of materials is evaluated by combining changes in volume, mass, and elastic modulus, thus avoiding human contact with acidic substances.
This enables an accurate and comprehensive assessment of the acid resistance of materials, reduces the safety risks to testing personnel, and improves the reliability and accuracy of test results.
Smart Images
Figure CN121595443A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of testing devices, and more specifically, to a device and method for testing acid resistance. Background Technology
[0002] Acid-resistant materials are commonly used in metallurgy, petrochemicals, and chemicals, including acid-resistant bricks, acid-resistant spray coatings, and castables. The acid resistance of these materials is crucial for their application. Existing acid resistance testing methods determine the acid resistance of materials by measuring mass loss rate or flexural strength retention rate. However, the operating environments of acid-resistant materials vary, and their morphological structures also differ. Their actual structures are not completely homogeneous. In acidic environments, some materials experience significant mass loss without a corresponding decrease in structural strength. Similarly, some materials may experience less mass loss, but their structural strength may be compromised. Therefore, current acid resistance testing methods cannot comprehensively assess a material's acid resistance solely based on the mass loss rate. The loss of flexural strength, caused by both mass and volume loss in acidic environments, represents a performance degradation due to the former. Furthermore, flexural strength testing is a destructive test; the samples before and after acid treatment are not the same, inevitably introducing some error into the determination of the material's acid resistance.
[0003] Therefore, an acid resistance testing device and method are needed to solve the above problems and meet the application requirements. Summary of the Invention
[0004] The purpose of this application is to provide an acid resistance testing device and method that can simulate an acidic liquid or gas environment to test the sample, thereby accurately and comprehensively evaluating the acid resistance of the sample and avoiding safety risks to the test personnel.
[0005] This application is implemented as follows: This application provides an acid resistance testing device, which includes: Test vessel; Multiple liquid storage tanks are located above the test vessel and are connected to a liquid supply pipe at their bottom via an outlet pipe. The liquid supply pipe is connected to the test vessel. Each outlet pipe is equipped with a first control valve, and the liquid supply pipe is equipped with a flow valve. The acid gas absorption tank is connected to the top of the test vessel via an exhaust pipe; An acid recovery tank is located below the test vessel and is connected to the bottom of the test vessel via a drain pipe. A second control valve is installed on the drain pipe. At least one heater is located at the bottom of the test vessel; The sample holder is located inside the test vessel to support and fix the sample; A weighing device, connected to the bottom wall of the test vessel, is used to measure the mass of the sample holder.
[0006] In some alternative implementations, the test vessel is also equipped with at least one liquid level sensor for detecting the liquid level.
[0007] In some alternative implementations, a magnetic stirrer is also provided at the bottom of the test vessel.
[0008] In some alternative implementations, the test vessel is connected to a pressure gauge for detecting internal pressure.
[0009] In some alternative implementations, a pressure control valve is provided on the exhaust pipe.
[0010] In some alternative embodiments, the inner wall of the test vessel is provided with multiple gas circulation devices arranged circumferentially, which are used to drive the gas to move circumferentially along the test vessel.
[0011] In some alternative embodiments, the gas circulation device includes a circulation housing, an airflow channel disposed on the circulation housing and extending circumferentially along the test vessel, and a fan for driving the gas to move along the airflow channel.
[0012] In some alternative implementations, the surface of the weighing device is covered with a flexible, acid-resistant protective film.
[0013] This application also provides a method for testing acid resistance, which is performed using the aforementioned acid resistance testing apparatus and includes the following steps: The test sample is fixed on the sample holder and its mass is weighed using a weighing device. Open the first control valve to allow the pure water in the corresponding storage tank to enter the test vessel through the outlet pipe and the supply pipe to clean the test sample. Open the second control valve to drain the pure water to the acid recovery tank and then close the second control valve. Open another first control valve to allow the acid in the corresponding storage tank to enter the test vessel through the corresponding outlet pipe and supply pipe, and close the first control valve after the acid level in the test vessel reaches the preset value by controlling the flow valve; Turn on the heater to heat the acid solution to simulate the acidic liquid environment and corrode the test sample for a preset time. Then, open the second control valve to drain the acid solution into the acid recovery tank and close the second control valve. Open the first control valve to allow pure water from the corresponding storage tank to enter the test vessel through the outlet pipe and supply pipe to clean the test sample. Open the second control valve to drain the pure water to the acid recovery tank and then close the second control valve. Repeat this process several times. After drying the test sample by turning on the heater, weigh it using a weighing device. The acid resistance of the test sample is evaluated by the changes in its mass, volume, and elastic modulus before and after the test.
[0014] In some alternative implementations, the following acid resistance indicators are used. R A Assess the acid resistance of the tested sample: ; In the formula, 、 、 These are the influence coefficients for volume, mass, and elastic modulus, respectively. + + =1; v 1. v 2 represents the volume of the test sample before and after the experiment; m 1. m 2 represents the mass of the test sample before and after the experiment; E 1. E 2 represents the elastic modulus of the test sample before and after the test.
[0015] The beneficial effects of this application are as follows: The acid resistance testing device provided by this application includes a test vessel, multiple storage tanks located above the test vessel, an acidic gas absorption tank, an acid recovery tank located below the test vessel, at least one heater located at the bottom of the test vessel, a sample holder located inside the test vessel for supporting and fixing the sample, and a weighing device connected to the bottom wall of the test vessel. Each storage tank has a supply pipe connected to its bottom via an outlet pipe, and the supply pipe is connected to the test vessel. Each outlet pipe is equipped with a first control valve, and the supply pipe is equipped with a flow valve. The acidic gas absorption tank is connected to the top of the test vessel via an exhaust pipe. The acid recovery tank is connected to the bottom of the test vessel via a drain pipe, and the drain pipe is equipped with a second control valve. The weighing device is used to measure the mass of the sample holder. The acid resistance testing device and method provided by this application can simulate an acidic liquid or gas environment to test the sample, thereby accurately and comprehensively evaluating the acid resistance of the sample and avoiding safety risks to testing personnel. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a cross-sectional view of the acid resistance testing device provided in the embodiments of this application; Figure 2This is a partial cross-sectional view of the connection between the gas circulation device and the test vessel in the acid resistance testing apparatus provided in the embodiments of this application.
[0018] In the diagram: 100, test vessel; 110, storage tank; 120, outlet pipe; 130, supply pipe; 140, first control valve; 150, flow valve; 160, level sensor; 170, magnetic stirring device; 180, pressure gauge; 200, acidic gas absorption tank; 210, exhaust pipe; 220, pressure control valve; 300, acid recovery tank; 310, drain pipe; 320, second control valve; 400, heater; 500, sample holder; 600, weighing device; 700, gas circulation device; 710, circulation shell; 720, airflow channel; 730, fan; 800, test sample. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0022] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0023] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0025] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0026] The features and performance of the acid resistance testing device and method of this application are further described in detail below with reference to the embodiments.
[0027] like Figure 1 and Figure 2As shown in the figure, this application provides an acid resistance testing device, which includes a test vessel 100, four storage tanks 110 disposed above the test vessel 100, an acid gas absorption tank 200 disposed on one side of the test vessel 100, and an acid recovery tank 300 disposed below the test vessel 100; wherein, the bottom of each storage tank 110 is connected to an outlet pipe 120, and each outlet pipe 120 is provided with a first control valve 140; the bottom of the test vessel 100 is connected to a supply pipe 130, which is connected to each outlet pipe 120, and the supply pipe 130 is provided with a flow valve 150; the acid gas absorption tank 200 is connected to the top of the test vessel 100 through an exhaust pipe 210, and the exhaust pipe 210 is provided with a pressure control valve 220, which is used for... When the pressure is greater than or less than the preset value, the exhaust pipe 210 is connected or disconnected; the acid recovery tank 300 is connected to the bottom of the test vessel 100 through the drain pipe 310, and the drain pipe 310 is equipped with a second control valve 320; a heater 400 is provided on each side of the bottom of the test vessel 100; a sample holder 500 for supporting and fixing the sample and a weighing device 600 for measuring the mass of the sample holder 500 are connected to the bottom of the test vessel 100; the surface of the weighing device 600 is covered with a flexible protective film made of acid-resistant polytetrafluoroethylene; a liquid level sensor 160 for detecting the liquid level is also provided on the inner wall of the test vessel 100; a magnetic stirring device 170 is also provided at the bottom of the test vessel 100; and a pressure gauge 180 for detecting the internal pressure is connected to the test vessel 100.
[0028] The inner wall of the test vessel 100 is provided with two gas circulation devices 700 arranged circumferentially. The gas circulation devices are used to drive the gas to move circumferentially along the test vessel 100. Each gas circulation device 700 includes a circulation shell 710, an airflow channel 720 provided on the circulation shell 710, and a fan 730 for driving the gas to move along the airflow channel 720. The airflow channel 720 extends circumferentially along the test vessel 100 and connects both sides of the circulation shell 710.
[0029] This application also provides an acid resistance testing method, which is performed using the aforementioned acid resistance testing apparatus, and includes the following steps: Step 1: Use the ultrasonic method to determine the elastic modulus of the test sample 800, measure the volume of the test sample 800, fix the test sample 800 on the sample holder 500, use the weighing device 600 to weigh the mass of the sample holder 500 and the test sample 800, and calculate the initial mass of the test sample 800. Step 2: Add pure water, nitric acid, hydrochloric acid, and sulfuric acid to the four storage tanks 110 respectively. Open the first control valve 140 to allow the pure water in the corresponding storage tank 110 to enter the test vessel 100 through the outlet pipe 120 and the supply pipe 130 until the test sample 800 is submerged. Use the flow valve 150 set on the supply pipe 130 to detect the flow rate of pure water entering the test vessel 100 and close the first control valve 140 when the preset value is reached. At the same time, use the liquid level sensor 160 set on the inner wall of the test vessel 100 to detect the liquid level in the test vessel 100 to prevent the pure water level in the test vessel 100 from being too high. Open the magnetic stirring device 170 set at the bottom of the test vessel 100 to clean the test sample 800. After cleaning, open the second control valve 320 to drain the pure water to the acid recovery tank 300 and then close the second control valve 320. Step 3: Open another first control valve 140 to allow nitric acid in the corresponding storage tank 110 to enter the test vessel 100 through the corresponding outlet pipe 120 and supply pipe 130. Control the acid level entering the test vessel 100 through the flow valve 150. At the same time, use the liquid level sensor 160 installed on the inner wall of the test vessel 100 to detect the acid level in the test vessel 100 to prevent the acid level in the test vessel 100 from being too high. Close the first control valve 140 when the acid level reaches the preset value. Step 4: Turn on heater 400 to heat the acid solution to simulate an acidic liquid environment, and control magnetic stirrer 170 to stir the acid solution to corrode the test sample 800 for a preset time. Then, open second control valve 320 to drain the acid solution to acid recovery tank 300 and then close second control valve 320. At the same time, when the pressure in test vessel 100 is too high, open pressure control valve 220 to discharge the acid gas in test vessel 100 through exhaust pipe 210 to acid gas absorption tank 200 for absorption. After the pressure in test vessel 100 decreases, close pressure control valve 220. Step 5: Open the first control valve 140 to allow the pure water in the corresponding storage tank 110 to enter the test vessel 100 through the outlet pipe 120 and the supply pipe 130 until the test sample 800 is submerged. Control the magnetic stirring device 170 to turn on the stirring pure water to clean the test sample 800. Open the second control valve 320 to drain the pure water to the acid recovery tank 300 and then close the second control valve 320. Repeat four times. Step 6: Turn on the heater 400 and the gas circulation device 700, so that the fan 730 of the gas circulation device 700 drives the air to move around the test vessel 100 through the airflow channel 720 to dry the test sample 800. After the test sample 800 is dried, use the weighing device 600 to weigh the mass of the sample holder 500 and the test sample 800, calculate the final mass of the test sample 800 after the test, use the ultrasonic method to determine the elastic modulus of the test sample 800 after the test, and measure the volume of the test sample 800 after the test. Step 7: Evaluate the acid resistance of test sample 800 by measuring the changes in mass, volume, and elastic modulus before and after the test. The following acid resistance indicators can be used. R A Assess the acid resistance of the tested sample 800: ; In the formula, 、 、 These are the influence coefficients for volume, mass, and elastic modulus, respectively. 、 、 Each value is between 0 and 1 and + + =1; v 1. v 2 represents the volume of the test sample before and after the experiment; m 1. m 2 represents the mass of the test sample before and after the experiment; E 1. E 2 represents the elastic modulus of the test sample before and after the test; the acid resistance index of the test sample at 800 is denoted as 2. R A The larger the value, the better its acid resistance.
[0030] The acid resistance testing device and method provided in this application embodiment includes a sample holder 500 for supporting and fixing the sample, and a weighing device 600 for measuring the mass of the sample holder 500, all housed within a test vessel 100. Pure water and various acid solutions are stored in storage tanks 110 above the test vessel 100. The storage tanks 110 are connected to the test vessel 100 via an outlet pipe 120 equipped with a first control valve 140 and a supply pipe 130 equipped with a flow valve 150. This allows the test sample 800 to be fixed on the sample holder 500 and weighed. Pure water stored in one storage tank 110 is introduced into the test vessel 100 to clean the fixed test sample 800 before the sample is removed from the test vessel. Pure water in the test vessel 100 is discharged to the acid recovery tank 300 via drain pipe 310. Then, acid stored in another storage tank 110 is introduced into the test vessel 100 and heated to create an acidic liquid or gas environment for testing the acid resistance of a fixed test sample 800. After a preset testing time, the acid in the test vessel 100 is discharged to the acid recovery tank 300 via drain pipe 310. The fixed test sample 800 in the test vessel 100 is then rinsed with pure water and weighed. The acid resistance can be quantitatively evaluated based on the changes in volume loss, mass loss, and elastic modulus of the test sample 800 before and after the acid resistance test. Influence coefficients for volume, mass, and elastic modulus are also introduced. φ 1 φ 2 φ 3. This method reflects the impact of volume loss, mass loss, and changes in elastic modulus on acid resistance, thereby providing a more comprehensive assessment of the acid resistance of the tested sample 800.
[0031] The heater 400 inside the test vessel 100 heats the acid solution to create an acidic gas environment for acid resistance testing. After rinsing with pure water, the heater 400 is used to dry the solution and remove excess moisture. The gas circulation device 700 inside the test vessel 100 uses a fan 730 to drive gas along the airflow channel 720 to circumferentially move the gas around the test vessel 100, providing hot air circulation and hot acidic gas circulation. This better simulates the corrosive environment (acidic gas environment or acidic liquid environment) of the material, making the test results more reliable and automating the testing process. This effectively avoids various safety risks.
[0032] The weighing device 600 is covered with a flexible, acid-resistant polytetrafluoroethylene protective film, which protects it from acid corrosion and extends its service life. The acid gas absorption tank 200 is connected to the top of the test vessel 100 via an exhaust pipe 210. The exhaust pipe 210 is equipped with a pressure control valve 220 that opens or closes when the pressure is greater than or less than a preset value. This valve allows excess acid gas to be discharged into the acid gas absorption tank 200 for absorption when the pressure inside the test vessel 100 is too high, preventing safety hazards. The test vessel 100 is connected to a pressure gauge 180 for real-time monitoring of pressure changes, preventing safety hazards caused by excessive pressure.
[0033] In other alternative embodiments, the number of storage tanks 110 may be two, three, four or more.
[0034] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
Claims
1. An acid resistance testing device, characterized in that, It includes: Test vessel; Multiple liquid storage tanks are located above the test vessel and are connected to a liquid supply pipe at their bottoms via liquid outlet pipes. The liquid supply pipes are connected to the test vessel. Each liquid outlet pipe is equipped with a first control valve, and the liquid supply pipe is equipped with a flow valve. An acidic gas absorption tank is connected to the top of the test vessel via an exhaust pipe; An acid recovery tank is located below the test vessel and connected to the bottom of the test vessel via a drain pipe, which is equipped with a second control valve. At least one heater is located at the bottom of the test vessel; A sample holder is provided inside the test vessel to support and fix the sample; A weighing device is connected to the bottom wall of the test vessel to measure the mass of the sample holder.
2. The acid resistance testing device according to claim 1, characterized in that, The test vessel is also equipped with at least one liquid level sensor for detecting the liquid level.
3. The acid resistance testing device according to claim 2, characterized in that, The bottom of the test vessel is also equipped with a magnetic stirring device.
4. The acid resistance testing device according to claim 1, characterized in that, The test vessel is connected to a pressure gauge for detecting internal pressure.
5. The acid resistance testing device according to claim 1, characterized in that, The exhaust pipe is equipped with a pressure control valve.
6. The acid resistance testing device according to claim 1, characterized in that, The inner wall of the test vessel is provided with multiple gas circulation devices arranged at intervals along the circumference, which are used to drive the gas to move along the circumference of the test vessel.
7. The acid resistance testing device according to claim 6, characterized in that, The gas circulation device includes a circulation housing, an airflow channel disposed on the circulation housing and extending circumferentially along the test vessel, and a fan for driving the gas to move along the airflow channel.
8. The acid resistance testing device according to claim 1, characterized in that, The surface of the weighing device is covered with a flexible, acid-resistant protective film.
9. A method for testing acid resistance, characterized in that, It is conducted using the acid resistance testing apparatus as described in any one of claims 1 to 8, and includes the following steps: The test sample is fixed on the sample holder and its mass is weighed using a weighing device. Open the first control valve to allow pure water in the corresponding storage tank to enter the test vessel through the outlet pipe and the supply pipe to clean the test sample. Open the second control valve to drain the pure water to the acid recovery tank and then close the second control valve. Open another first control valve to allow the acid in the corresponding storage tank to enter the test vessel through the corresponding outlet pipe and supply pipe, and close the first control valve after the acid level in the test vessel reaches the preset value by controlling the flow valve; Turn on the heater to heat the acid solution to simulate the acidic liquid environment and corrode the test sample for a preset time. Then, open the second control valve to drain the acid solution into the acid recovery tank and close the second control valve. Open the first control valve to allow pure water from the corresponding storage tank to enter the test vessel through the outlet pipe and supply pipe to clean the test sample. Open the second control valve to drain the pure water to the acid recovery tank and then close the second control valve. Repeat this process several times. After drying the test sample by turning on the heater, weigh it using a weighing device. The acid resistance of the test sample is evaluated by the changes in its mass, volume, and elastic modulus before and after the test.
10. The acid resistance test method according to claim 9, characterized in that, Use the following acid resistance indicators R A Assess the acid resistance of the tested sample: ； In the formula, 、 、 These are the influence coefficients for volume, mass, and elastic modulus, respectively. + + =1; v 1. v 2 represents the volume of the test sample before and after the experiment; m 1. m 2 represents the mass of the test sample before and after the experiment; E 1. E 2 represents the elastic modulus of the test sample before and after the test.