Mechanical material performance testing system under strong corrosion environment

Abstract

The invention discloses a mechanical material performance test system in a strong corrosion environment, which belongs to the technical field of material performance test, and comprises a host, a support, a test kettle, a mechanical loading module, a gas circulation module and a temperature control module, the mechanical loading module is erected on the host through a bracket; the test kettle is fixedly arranged on the bracket and is arranged below the mechanical loading module; the gas circulation module is communicated with the test kettle; a temperature control module is arranged on the periphery of the test piece in the test kettle; the upper end of the test kettle is connected with a mechanical loading module, and stress is applied to the test piece through the mechanical loading module; and the control module is connected with the driving assembly in the host, the mechanical loading module, the temperature control module and the gas circulation module. The working temperature of hydrogen fluoride is simulated, the vacuum degree requirement in the test process is met, stretching, creep, fatigue and corrosion erosion tests can be carried out, the test force measurement error is small, the working requirement is met, the data precision is high, and the equipment safety has an early warning and protection mechanism.

Description

Technical Field

[0001] This invention belongs to the field of material performance testing technology, and more specifically relates to a mechanical material performance testing system under strong corrosive environments. Background Technology

[0002] In industries such as chemical and energy, hydrogen fluoride poses a severe challenge to the durability of equipment materials (such as metals, alloys, ceramics, and coatings) due to its strong corrosiveness and high reactivity. Traditional material testing techniques have the following limitations: Insufficient simulation of corrosion environment: Conventional testing equipment (such as salt spray chambers and electrochemical workstations) are mostly designed for neutral or weakly corrosive media (such as NaCl solutions), and cannot simulate the high temperature, high pressure, and complex multiphase flow conditions of high-concentration hydrogen fluoride (gaseous or liquid). Hydrogen fluoride readily reacts with common reaction vessel materials such as glass and quartz. Existing devices mostly rely on nickel-based alloys or polytetrafluoroethylene (PTFE) liners, but problems such as sealing failure and media penetration still exist during long-term testing. Lack of dynamic performance monitoring: Traditional methods mainly rely on static immersion or weight loss methods, which are difficult to monitor in real time the mechanical properties (such as stress corrosion cracking susceptibility), electrochemical parameters (such as polarization resistance), and surface morphology evolution of materials in hydrogen fluoride environments. In high-temperature hydrogen fluoride environments, materials may experience failure behaviors such as hydrogen embrittlement and intergranular corrosion, but current technologies lack integrated means for simultaneous loading and corrosion monitoring. Safety and Environmental Risks: Hydrogen fluoride is highly toxic and volatile. Existing open testing systems are prone to leakage, and protective measures rely on fume hoods or external absorption devices, which cannot completely eliminate operational risks. Post-test wastewater treatment is complex, lacking closed-loop recycling or neutralization mechanisms, increasing the environmental burden. Insufficient Standardization and Data Comparability: Current testing standards for hydrogen fluoride corrosion (such as ASTM G71 and ISO 17475) focus primarily on short-term exposure tests, lacking accelerated testing methods that simulate actual operating conditions (such as cyclic heat loads and alternating multi-media conditions), leading to a disconnect between laboratory data and engineering applications. Therefore, developing a mechanical property testing system for materials in highly corrosive environments is an urgent problem to be solved in this field. Summary of the Invention

[0003] In view of this, the present invention provides a mechanical material performance testing system under strong corrosive environment. The system simulates a strong corrosive environment by injecting hydrogen fluoride through a pipeline to conduct tensile, creep, fatigue, and corrosion erosion mechanical property tests on materials.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A mechanical material performance testing system under highly corrosive environments includes a main unit, a support, a test vessel, a mechanical loading module, a gas circulation module, and a temperature control module. The mechanical loading module is mounted on the main unit via the support. The test vessel is fixedly mounted on the support and positioned below the mechanical loading module. The gas circulation module is connected to the test vessel. The temperature control module is located inside the test vessel on the outer periphery of the specimen. The upper end of the test vessel is connected to the mechanical loading module, which applies stress to the specimen. The system also includes a control module connected to the drive components, mechanical loading module, temperature control module, and gas circulation module within the main unit.

[0005] Furthermore, the support includes three first columns and one second column; the lower ends of the first and second columns are connected to the main unit, and the upper ends are connected to each other through an upper crossbeam; a transition plate is fixedly connected to the lower end of the test vessel; support rings are fixedly provided at the lower parts of the first and second columns; the transition plate is fixedly connected to the support ring.

[0006] Furthermore, the mechanical loading module includes a driving component and a loading component; the driving component is mounted on a support via a motor bracket, and its lower end is connected to the loading component; the loading component includes a loading column, the upper end of which is connected to the driving component, and the lower end of which penetrates the test vessel to apply stress to the specimen; the lower end of the motor bracket is fixedly connected to the test vessel via a connecting column; The motor bracket is slidably connected to three first columns; the second column includes an upper column and a lower column; the motor bracket is slidably connected to the upper column via a sliding seat; the sliding seat is sleeved on the upper column and threadedly connected to the upper column; the upper end of the upper column is rotatably connected to the upper crossbeam, and the lower end passes through the lower column and the upper wall of the main unit, and is fixedly connected to the drive component set inside the main unit.

[0007] Furthermore, the drive assembly includes a servo motor, a reducer, a coupling, a ball screw, and a pressure head assembly; the servo motor and the reducer are fixedly mounted on a motor bracket; the servo motor is positioned above the reducer, and its output end is connected to the coupling via the reducer; the lower end of the coupling is connected to the ball screw, which in turn connects to the loading pressure head assembly.

[0008] Furthermore, the test vessel includes a lid, a body, an upper connecting ring, and a base plate; the lid is fixedly connected to the motor bracket via a connecting column; the base plate is fixedly connected to the adapter plate; the upper end of the body is fixedly connected to the upper connecting ring, and the lower end is fixedly connected to the base plate; the upper end face of the upper connecting ring is provided with an annular groove for setting an O-ring seal, which is sealed to the lid.

[0009] Furthermore, the test vessel is equipped with a clamp for holding the specimen, and the lower end of the loading column passes through the lid of the test vessel and is connected to the clamp.

[0010] Furthermore, the temperature control module includes a heating component for providing a high-temperature atmosphere environment for the specimen; the heating component is configured as two sets of semi-cylindrical resistance wire winding heating furnaces.

[0011] Furthermore, the test vessel is also equipped with a thermocouple for temperature measurement.

[0012] Furthermore, the gas circulation module includes an inlet pipe, a filling pump, a hydrogen fluoride cylinder, a vacuum tube, a circulation pipeline, an inert gas cylinder, an air cylinder, and a vacuum pump; one end of the inlet pipe is connected to the test vessel, and the other end is connected to the filling pump; the hydrogen fluoride cylinder, the inert gas cylinder, and the air cylinder are all arranged in parallel in the circulation pipeline; one end of the vacuum tube is connected to the test vessel, and the other end is connected to the vacuum pump, and the other end of the vacuum pump is connected to the circulation pipeline.

[0013] Furthermore, the circulation pipeline includes a hydrogen fluoride pipeline, an inert gas pipeline, an air pipeline, and an extraction pipeline; the hydrogen fluoride pipeline, inert gas pipeline, and air pipeline are connected in parallel, with one end connected to the extraction pipeline and the other end connected to the charging pump; a hydrogen fluoride gas tank is connected inside the hydrogen fluoride pipeline, and hydrogen fluoride valves are installed before and after the hydrogen fluoride gas tank; an inert gas tank is connected inside the inert gas pipeline, and inert gas valves are installed before and after the inert gas tank; an air tank is connected inside the air pipeline, and the air tank is equipped with an air valve; a vacuum pump is installed in the extraction pipeline, and it is connected to the test vessel through a vacuum tube.

[0014] The beneficial effects of this invention are as follows: This invention provides a mechanical material performance testing system for highly corrosive environments. The system employs a modular design, achieving mechanical testing of hydrogen fluoride materials through the coupling of a mechanical loading module, a temperature control module, and a gas circulation module. This testing system can simulate the operating temperature of hydrogen fluoride, meet the vacuum requirements during testing, and perform tensile, creep, fatigue, and corrosion erosion tests. It exhibits small force measurement errors, meeting operational requirements, high data accuracy, and includes early warning and protection mechanisms for equipment safety. Utilizing the technology to detect the impact of the strong corrosiveness of hydrogen fluoride on material properties, mechanical testing can be conducted in hydrogen fluoride environments, making it suitable for material mechanical property testing in various industries and testing departments. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the internal structure of the present invention.

[0017] Figure 2 This is a side view of the present invention.

[0018] In the figure: 1-Main unit; 2-Bracket; 21-First column; 22-Second column; 23-Adapter plate; 24-Support ring; 25-Upper crossbeam; 3-Test vessel; 31-Vessel cover; 32-Vessel body; 33-Upper connecting ring; 34-Base plate; 41-Servo motor; 42-Reducer; 43-Coupling; 44-Motor bracket; 45-Pressure head assembly; 46-Ball screw; 47-Connecting column; 48-Loading column; 51-Inlet pipe; 52-Inflation pump; 53-Hydrogen fluoride tank; 54-Vacuum tube; 55-Circulation pipeline; 56-Inert gas tank; 57-Air tank; 58-Vacuum pump; 6-Temperature control module. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see the appendix Figure 1-2 This invention provides a mechanical material performance testing system under highly corrosive environments, comprising a main unit 1, a support 2, a test vessel 3, a mechanical loading module, a gas circulation module, and a temperature control module 6. The mechanical loading module is mounted on the main unit 1 via the support 2; the test vessel 3 is fixedly mounted on the support 2, positioned below the mechanical loading module; the gas circulation module is connected to the test vessel and is used to establish a hydrogen fluoride atmosphere and a vacuum or inert gas environment for the test vessel. The upper end of the test vessel 3 is connected to the mechanical loading module, which applies stress to the specimen.

[0021] The support 2 includes three first columns 21 and one second column 22; the lower ends of the first columns 21 and the second columns 22 are connected to the host 1, and the upper ends are connected to each other through the upper crossbeam 25.

[0022] The mechanical loading module, as the main component of the strain-stress loading test, includes a driving component and a loading component. The driving component is used to drive the loading component to apply stress to the internal fixtures of the test vessel 3. The driving component is mounted on the support 2 via a motor bracket 44, and its lower end is connected to the loading component. The lower end of the motor bracket 44 is fixedly connected to the test vessel 3 via a connecting column 47.

[0023] The drive assembly includes a servo motor 41, a reducer 42, a coupling 43, a ball screw 46, and a pressure head assembly 45. The servo motor 41 and the reducer 42 are fixedly mounted on a motor bracket 44. The servo motor 41 is positioned above the reducer 42, and its output end is connected to the coupling 43 via the reducer 42. The lower end of the coupling 43 is connected to the ball screw 46, which in turn connects to the loading pressure head assembly 45. The servo motor 41 drives the reducer to rotate, and the torque is transmitted to the ball screw 46 via the coupling. The ball screw 46 converts the rotation into linear motion of the pressure head assembly 45, which is then loaded into the test vessel 3 to complete the mechanical performance test.

[0024] The loading component includes a loading column 48, the upper end of which is connected to the pressure head assembly 45, and the lower end of which penetrates the test vessel 3 to apply stress to the specimen.

[0025] The motor bracket 44 is slidably connected to three first columns 21; the second column includes an upper column and a lower column; the motor bracket 44 is slidably connected to the upper column via a sliding seat; the sliding seat is sleeved on the upper column and threadedly connected to the upper column; the upper end of the upper column is rotatably connected to the upper crossbeam 25, and the lower end passes through the lower column and the upper wall of the main unit 1, and is fixedly connected to the drive component disposed inside the main unit 1. The drive component is used to drive the upper column to rotate, thereby driving the sliding seat and the motor bracket 44 to move up and down.

[0026] The test vessel 3 serves as a reactor, providing a venue for mechanical property testing. A transition plate 23 is fixedly connected to the lower end of the test vessel 3. Support rings 24 are fixedly installed at the lower parts of the three first columns 21 and one second column 22. The transition plate 23 is fixedly connected to the support rings 24 by bolts. The transition plate 23 serves to fix and position the device, ensuring that during material property testing in a highly corrosive environment, it prevents the device from shaking, which could lead to poor connection and improve system reliability.

[0027] The test vessel 3 includes a lid 31, a body 32, an upper connecting ring 33, and a base plate 34. The lid 31 is fixedly connected to the motor bracket 44 via a connecting post 47. The base plate 34 is fixedly connected to the adapter plate 23 via bolts. The upper end of the body 32 is fixedly connected to the upper connecting ring 33, and the lower end is fixedly connected to the base plate 34. The upper end face of the upper connecting ring 33 is provided with an annular groove for setting an O-ring seal, which seals with the lid 31. The O-ring seal is made of fluororubber. The drive component inside the main unit 1 drives the motor bracket 44 to move the lid 31 downward, causing the lid 31 to close tightly on the body 32, and the O-ring seals the lid 31 and the upper connecting ring 33. The diameter of the annular groove of the upper connecting ring 33 is slightly larger than the depth of the sealing groove, generating 15%-30% elastic pre-compression, forming initial contact pressure with the sealing surface, filling the tiny gaps, and achieving a static seal. When there is pressure inside the vessel body 32, the O-ring is squeezed towards the low-pressure side. The medium pressure increases the pressure on the mating surface, increasing the contact pressure and area, thus creating a self-sealing effect and preventing leakage. The vessel cover 31 of the test vessel 3 fits tightly with the upper connecting ring 33 to prevent leakage of hydrogen fluoride gas, achieving a compact overall design and low force loss during operation.

[0028] The test vessel 3 is equipped with a clamp for holding the test specimen. The lower end of the loading column 48 passes through the lid 31 of the test vessel 3 and is connected to the clamp to apply stress to the test specimen.

[0029] A temperature control module 6 is installed inside the test vessel 3, located around the outer periphery of the specimen. The temperature control module 6 includes a heating element for providing a high-temperature atmosphere for the specimen. The heating element is configured as two sets of semi-cylindrical resistance wire winding furnaces, with the resistance wire diameter being approximately 2 mm.

[0030] The test vessel 3 is also equipped with a thermocouple for temperature measurement. The commonly used temperature measurement range is -30~600℃, and the temperature measurement accuracy is less than or equal to ±0.1%. The thermocouple is arranged within the gauge length of the sample.

[0031] The gas circulation module includes an inlet pipe 51, an inflation pump 52, a hydrogen fluoride gas tank 53, a vacuum pipe 54, a circulation pipeline 55, an inert gas tank 56, an air tank 57, and a vacuum pump 58. One end of the inlet pipe 51 is connected to the test vessel 3, and the other end is connected to the inflation pump 52. The hydrogen fluoride gas tank 53, the inert gas tank 56, and the air tank 57 are all arranged in parallel in the circulation pipeline 55. One end of the vacuum pipe 54 is connected to the test vessel 3, and the other end is connected to the vacuum pump 58. The other end of the vacuum pump 58 is connected to the circulation pipeline 55.

[0032] The circulation pipeline 55 includes a hydrogen fluoride pipeline, an inert gas pipeline, an air pipeline, and an extraction pipeline. The hydrogen fluoride pipeline, inert gas pipeline, and air pipeline are connected in parallel, with one end connected to the extraction pipeline and the other end connected to the air pump 52. A hydrogen fluoride gas tank 53 is connected inside the hydrogen fluoride pipeline, and hydrogen fluoride valves are installed before and after the hydrogen fluoride gas tank 53. An inert gas tank 56 is connected inside the inert gas pipeline, and inert gas valves are installed before and after the inert gas tank 56. An air tank 57 is connected inside the air pipeline, and air tank 57 is equipped with an air valve. A vacuum pump 58 is installed in the extraction pipeline and connected to the test vessel 3 through a vacuum pipe 54, which can evacuate the test vessel 3.

[0033] During the operation of the gas circulation module, the vacuum pump 58 can be used to evacuate the test vessel 3. At this time, the air pipeline is connected, and the valves of other pipelines are closed. The vacuum pump 58 introduces air into the air tank 57. Then, the outlet of the inert gas pipeline is connected, and the valves of other pipelines are closed. The gas filling pump 52 introduces inert gas into the test vessel 3. The inert gas can be argon. After that, the inlet of the inert gas pipeline is connected, and the valves of other pipelines are closed. The vacuum pump 58 extracts the inert gas from the test vessel 3 and introduces it into the inert gas tank 56. This process is repeated several times until the impurity gas content in the test vessel 3 drops to below 0.5%. Finally, the hydrogen fluoride pipeline is connected, and the other pipelines are closed. The gas filling pump 52 introduces hydrogen fluoride gas into the test vessel 3 until the purity meets the test requirements, which can ensure the purity of hydrogen fluoride and avoid test interference.

[0034] Hydrogen fluoride is a toxic medium, and the diffusion of the test gas must be strictly controlled to ensure safety. Therefore, the participating gas in the test vessel 3 must be removed before introducing hydrogen fluoride. The circulation pipeline 55 creates conditions for the mechanical test, removes impurities from the test vessel 3 to ensure the test can proceed, and provides the hydrogen fluoride gas required for the test to simulate a highly corrosive environment to ensure the test can proceed.

[0035] The testing system of the present invention also includes a control module, which connects the drive components, mechanical loading module, temperature control module 6 and gas circulation module inside the host 1, and is used to complete load, displacement, atmosphere, temperature and safety monitoring.

[0036] The gas circulation module employs a PLC controller, which is electrically connected to the control module to control the inflation pump, vacuum pump, and various valves. The vacuum pump uses a mechanical vacuum pump to generate a vacuum, and a digital vacuum gauge measures the vacuum level inside the vessel, transmitting the signal to the PLC controller for control. During the inflation process, pressure transmitters and flow meters are installed in the pipeline to detect pressure and flow rates. The PLC collects these values ​​and compares them with the target setpoint to achieve closed-loop control of gas delivery. Furthermore, the control system includes a wired or wireless communication network to ensure the reliability and timeliness of data transmission.

[0037] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mechanical material performance testing system under highly corrosive environments, characterized in that, The system includes a main unit (1), a support (2), a test vessel (3), a mechanical loading module, a gas circulation module, and a temperature control module (6). The mechanical loading module is mounted on the main unit (1) via the support (2). The test vessel (3) is fixedly mounted on the support (2) and positioned below the mechanical loading module. The gas circulation module is connected to the test vessel. The temperature control module (6) is located inside the test vessel (3) on the outer periphery of the specimen. The upper end of the test vessel (3) is connected to the mechanical loading module, which applies stress to the specimen. The system also includes a control module that connects the drive components, mechanical loading module, temperature control module (6), and gas circulation module within the main unit (1).

2. The mechanical material performance testing system under highly corrosive environments according to claim 1, characterized in that, The support (2) includes three first columns (21) and one second column (22); the lower ends of the first columns (21) and the second columns (22) are connected to the host (1), and the upper ends are connected to each other through the upper crossbeam (25); the lower end of the test vessel (3) is fixedly connected to a transition plate (23); the lower part of the first columns (21) and the second columns (22) is fixedly provided with a support ring (24); the transition plate (23) is fixedly connected to the support ring (24).

3. The mechanical material performance testing system under highly corrosive environments according to claim 2, characterized in that, The mechanical loading module includes a driving component and a loading component; the driving component is mounted on the support (2) via a motor bracket (44), and its lower end is connected to the loading component; the loading component includes a loading column (48), the upper end of which is connected to the driving component, and the lower end of which penetrates the test vessel (3) to apply stress to the specimen; the lower end of the motor bracket (44) is fixedly connected to the test vessel (3) via a connecting column (47). The motor bracket (44) is slidably connected to three first columns (21); the second column includes an upper column and a lower column; the motor bracket (44) is slidably connected to the upper column through a sliding seat; the sliding seat is sleeved on the upper column and threadedly connected to the upper column; the upper end of the upper column is rotatably connected to the upper crossbeam (25), and the lower end passes through the lower column and the upper wall of the host (1) and is fixedly connected to the drive component set inside the host (1).

4. The mechanical material performance testing system under highly corrosive environments according to claim 3, characterized in that, The drive assembly includes a servo motor (41), a reducer (42), a coupling (43), a ball screw (46), and a pressure head assembly (45); the servo motor (41) and the reducer (42) are fixedly mounted on a motor bracket (44); the servo motor (41) is mounted above the reducer (42), and its output end is connected to the coupling (43) through the reducer (42); the lower end of the coupling (43) is connected to the ball screw (46), and the pressure head assembly (45) is connected through the ball screw (46).

5. The mechanical material performance testing system under highly corrosive environments according to claim 3, characterized in that, The test vessel (3) includes a lid (31), a body (32), an upper connecting ring (33), and a base plate (34); the lid (31) is fixedly connected to the motor bracket (44) via a connecting column (47); the base plate (34) is fixedly connected to the adapter plate (23); the upper end of the body (32) is fixedly connected to the upper connecting ring (33), and the lower end is fixedly connected to the base plate (34); the upper end face of the upper connecting ring (33) is provided with an annular groove for setting an O-ring seal, which is sealed to the lid (31).

6. The mechanical material performance testing system under highly corrosive environments according to claim 5, characterized in that, The test vessel (3) is equipped with a clamp for holding the test specimen, and the lower end of the loading column (48) passes through the lid (31) of the test vessel (3) and is connected to the clamp.

7. The mechanical material performance testing system under highly corrosive environments according to claim 5, characterized in that, The temperature control module (6) includes a heating component for providing a high-temperature atmosphere environment for the specimen; the heating component is configured as a heating furnace with two sets of semi-cylindrical resistance wire winding.

8. The mechanical material performance testing system under highly corrosive environments according to claim 5, characterized in that, The test vessel (3) is also equipped with a thermocouple for temperature measurement.

9. The mechanical material performance testing system under highly corrosive environments according to claim 1, characterized in that, The gas circulation module includes an inlet pipe (51), an air pump (52), a hydrogen fluoride tank (53), a vacuum pipe (54), a circulation pipeline (55), an inert gas tank (56), an air tank (57), and a vacuum pump (58); one end of the inlet pipe (51) is connected to the test vessel (3), and the other end is connected to the air pump (52); the hydrogen fluoride tank (53), the inert gas tank (56), and the air tank (57) are all arranged in parallel in the circulation pipeline (55); one end of the vacuum pipe (54) is connected to the test vessel (3), and the other end is connected to the vacuum pump (58), and the other end of the vacuum pump (58) is connected to the circulation pipeline (55).

10. The mechanical material performance testing system under highly corrosive environments according to claim 9, characterized in that, The circulation pipeline (55) includes a hydrogen fluoride pipeline, an inert gas pipeline, an air pipeline, and an extraction pipeline; the hydrogen fluoride pipeline, the inert gas pipeline, and the air pipeline are connected in parallel, with one end connected to the extraction pipeline and the other end connected to the air pump (52); the hydrogen fluoride pipeline is connected to a hydrogen fluoride gas tank (53), and hydrogen fluoride valves are provided before and after the hydrogen fluoride gas tank (53); the inert gas pipeline is connected to an inert gas tank (56), and inert gas valves are provided before and after the inert gas tank (56); the air pipeline is connected to an air tank (57), and the air tank (57) is equipped with an air valve; the extraction pipeline is equipped with a vacuum pump (58), which is connected to the test vessel (3) through a vacuum pipe (54).

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