Multifunctional dynamic hydrogen charging test device

Abstract

The utility model relates to the technical field of material testing, and discloses a multifunctional dynamic hydrogen charging test device which comprises a liquid carrying device, a tensile fixture, an electrochemical hydrogen charging device and a temperature control device, the liquid carrying device comprises a columnar container and an upper sealing cover; the stretching clamp comprises a stretching clamp head and a stretching clamp clamping end; the electrochemical hydrogen charging device comprises a direct-current power supply and a platinum sheet, an anode of the direct-current power supply is connected with the platinum sheet, and a cathode of the direct-current power supply is connected with the tensile fixture head; the temperature control device is used for simulating test environments with different temperatures by the liquid carrying device; in the testing process, the clamping ends of the two tensile clamps are correspondingly connected with an upper chuck and a lower chuck of the universal tensile testing machine respectively. According to the utility model, the purpose of simultaneously charging hydrogen and stretching is achieved, so that the platform damage caused by direct contact between electrolyte and the universal tensile testing machine can be avoided, and the problems of limited hydrogen charging content and hydrogen overflow can be solved. The device is simple in structure, easy and convenient to operate, wide in applicability and capable of simulating actual working conditions to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of material testing, and more specifically, to a multifunctional dynamic hydrogen charging test device. Background Technique

[0002] With the strong support of the state and local governments for the hydrogen energy industry, the hydrogen energy industry in China has developed rapidly, and both the industrial scale and technical level have been significantly improved. However, the problems of hydrogen storage, transportation, and application have become bottlenecks for the large-scale development of hydrogen energy.

[0003] During the preparation of metal materials and their service in a hydrogen-rich environment, hydrogen atoms will move and accumulate in the material under the action of an external load. When the local hydrogen concentration reaches a certain value, cracks will initiate in the material, and then hydrogen embrittlement fracture will occur. Hydrogen embrittlement fracture is usually sudden and without warning, often causing serious consequences. At the same time, hydrogen embrittlement causes the fracture mode of the material to change from ductile dimpled fracture to brittle quasi-cleavage fracture or intergranular fracture, seriously affecting the service performance of the material and bringing great potential safety hazards. Therefore, studying the hydrogen embrittlement resistance of metal materials in a hydrogen-rich environment, understanding their fracture modes and mechanisms, is of great significance for extending the service life of equipment and components and reducing economic losses.

[0004] Currently, there are mainly two methods for hydrogen charging of metal materials in the laboratory: electrochemical hydrogen charging and gas-phase hydrogen charging. However, gas-phase hydrogen charging has problems such as difficult-to-reach experimental conditions, limited hydrogen charging amount, and great potential safety hazards; although electrochemical pre-hydrogen charging is simple to operate and can obtain a relatively high hydrogen concentration, there is a problem of hydrogen overflow. In actual engineering, metal materials are made into various parts, and their service environments are complex, such as environmental temperature. When studying the performance of metal materials, neither of these two hydrogen charging methods can effectively simulate the service environment of metal materials, and the experimental data obtained may deviate from the actual use effect.

[0005] Therefore, it is beneficial to the study of hydrogen embrittlement to provide a dynamic hydrogen charging test device with simple operation, wide application range, and capable of simulating actual working conditions to the greatest extent. Summary of the Utility Model

[0006] In view of this, aiming at the deficiencies of the existing technology, the utility model proposes a multifunctional dynamic hydrogen charging test device, and its specific technical solutions are as follows:

[0007] A multifunctional dynamic hydrogen charging test device includes a liquid carrier device, a tensile fixture, an electrochemical hydrogen charging device, and a temperature control device; the liquid carrier device includes a columnar container and an upper sealing cover installed at the top of the columnar container, and an upper opening for placing the tensile fixture and a first through hole for the electrochemical hydrogen charging device to pass through are provided on the upper sealing cover; the tensile fixture includes two upper and lower tensile fixture heads, a metal tensile specimen is correspondingly clamped between the two tensile fixture heads, and a tensile fixture clamping end is correspondingly connected to the side of each tensile fixture head away from the metal tensile specimen. The tensile fixture clamping end located above correspondingly extends out of the upper opening of the upper sealing cover, and the tensile fixture clamping end located below is embedded in the bottom of the columnar container and extends downward and outward; the electrochemical hydrogen charging device includes a DC power supply located outside the columnar container and a platinum sheet immersed in the electrolyte inside the columnar container. The anode of the DC power supply is connected to the platinum sheet through the first through hole of the upper sealing cover by an anode wire, and the cathode of the DC power supply is connected to any one of the tensile fixture heads inside the columnar container by a cathode wire; the temperature control device is detachably installed outside the liquid carrier device to simulate test environments at different temperatures for the liquid carrier device; during the test, the liquid carrier device and the temperature control device are supported by an external support frame, and the two tensile fixture clamping ends are respectively correspondingly connected to the upper and lower chucks of a universal tensile testing machine.

[0008] Preferably, the upper sealing cover is installed at the top of the columnar container through connecting bolts, and a first sealing ring is adaptively installed between the bottom surface of the outer ring of the upper sealing cover and the top surface of the columnar container, and a sealing ring limiting groove adapted to the first sealing ring is provided on the bottom surface of the outer ring of the upper sealing cover.

[0009] Preferably, both the columnar container and the upper sealing cover are made of transparent materials.

[0010] Preferably, the specimen clamping end of the tensile fixture head is customized according to the shape of the metal tensile specimen.

[0011] Preferably, the tensile fixture head and the corresponding tensile fixture clamping end are connected in the form of internal thread matching external thread.

[0012] Preferably, the outer wall of the tensile fixture clamping end is coated with an insulating coating.

[0013] Preferably, the gauge section and the arc transition section of the metal tensile specimen are located inside the columnar container, and both the gauge section and the arc transition section are immersed in the electrolyte inside the columnar container.

[0014] Preferably, the temperature control device includes an aluminum metal housing, a thermocouple and a temperature adjustment device. One side of the aluminum metal housing is provided with a receiving cavity capable of accommodating the liquid-carrying device. The bottom of the receiving cavity is provided with a lower opening for the clamping end of the stretching fixture below to extend downward and outward. On the bottom of the other side of the aluminum metal housing, there is an installation groove for installing the thermocouple and the temperature adjustment device. The measuring end of the thermocouple and the temperature adjustment end of the temperature adjustment device both extend into the receiving cavity in a sealed manner. A second through hole and a third through hole are provided on the outside of the installation groove. The first lead wire connected to the thermocouple is led out through the second through hole and externally connected to a temperature display instrument, and the second lead wire connected to the temperature adjustment device is led out through the third through hole and externally connected to a control power supply.

[0015] Preferably, the temperature adjustment device is a thermal resistor or a refrigeration chip. The thermal resistor or the refrigeration chip heats or cools the temperature control medium injected into the receiving cavity and outside the liquid-carrying device. By adjusting the power of the control power supply, the temperature of the temperature control medium is adjusted, and then the test environment temperature in the liquid-carrying device is adjusted. The temperature adjustment range is -40°C to 100°C.

[0016] Preferably, an embedding groove for restricting the installation position of the columnar container is provided at the center of the bottom of the receiving cavity, and a second sealing ring is arranged around the groove wall of the embedding groove.

[0017] Compared with the prior art, the multifunctional dynamic hydrogen charging test device of the present invention has the following beneficial effects:

[0018] (1) The device of the present invention has a simple structure, is easy to operate, has a wide applicability, and can simulate the actual working conditions to the greatest extent.

[0019] (2) The device of the present invention uses the temperature control device and the liquid-carrying device to provide a safe and reliable hydrogen charging environment, and at the same time, the mechanical properties of the target metal material are tested under the condition of meeting the hydrogen charging conditions, effectively preventing the problem of hydrogen overflow caused during the pre-hydrogen charging test.

[0020] (3) The temperature control device in the present invention can be disassembled and removed when performing a room temperature hydrogen charging test, simplifying the device structure.

[0021] (4) The device of the present invention can directly adjust the input current of the DC power supply to control the current density during hydrogen charging, and can regulate the hydrogen charging current density and the hydrogen charging time.

[0022] (5) Different from other dynamic hydrogen charging tensile test devices, the device of the present invention can process different metal tensile specimen sizes according to different working conditions, and design the stretching fixture accordingly, and the test method is more flexible.

[0023] (6) The stretching fixture in the present utility model and the metal stretching specimen adopt a hanging method, which can reduce the influence of the bending moment and torque generated during the specimen installation process on the test data, and the specimen loading is convenient.

[0024] (7) The device of the present utility model can be compatible with different universal tensile testing machines. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0026] Figure 1 It is the overall structure diagram of the liquid-carrying device and the stretching fixture in the present utility model.

[0027] Figure 2 It is the top view of the overall structure of the liquid-carrying device and the stretching fixture in the present utility model.

[0028] Figure 3 It is Figure 2 the sectional view in the A-A direction in

[0029] Figure 4 It is the connection and installation schematic diagram of the electrochemistry hydrogen charging device in the present utility model.

[0030] Figure 5 It is the structure diagram of the columnar container and the stretching fixture in the present utility model.

[0031] Figure 6 It is the structure diagram of the upper sealing cover in the present utility model.

[0032] Figure 7 It is the structure diagram of the temperature control device in the present utility model.

[0033] In the figure: 1 - liquid-carrying device, 11 - columnar container, 12 - upper sealing cover, 121 - upper opening, 122 - first through hole, 2 - stretching fixture, 21 - stretching fixture head, 22 - stretching fixture clamping end, 3 - electrochemistry hydrogen charging device, 31 - DC power supply, 32 - platinum sheet, 33 - anode wire, 34 - cathode wire, 4 - temperature control device, 41 - aluminum metal shell, 411 - lower opening, 412 - installation groove, 413 - first lead wire, 414 - second lead wire, 42 - thermocouple, 43 - temperature adjustment device, 5 - metal stretching specimen. Detailed Embodiments

[0034] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model, and should not be construed as limiting the present utility model.

[0035] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

[0036] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more, unless otherwise specifically defined.

[0037] Embodiment:

[0038] Referring to Figures 1-7 , the present utility model provides a multifunctional dynamic hydrogen charging test device with an upper and lower asymmetric structure, including a liquid-carrying device 1, a tensile fixture 2, an electrochemical hydrogen charging device 3, and a temperature control device 4.

[0039] Specifically, the liquid-carrying device 1 includes a columnar container 11 and an upper sealing cover 12 installed at the top of the columnar container. An upper opening 121 for inserting the tensile fixture 2 and a first through hole 122 for the electrochemical hydrogen charging device 3 to pass through are provided on the upper sealing cover 12.

[0040] The tensile fixture 2 includes two upper and lower tensile fixture heads 21. A metal tensile specimen 5 is correspondingly clamped between the two tensile fixture heads 21, that is, the metal tensile specimen 5 is suspended inside the tensile fixture 2; on the side of each tensile fixture head 21 away from the metal tensile specimen 5, a tensile fixture clamping end 22 is correspondingly connected. The tensile fixture clamping end 22 located above extends out of the upper opening 121 of the upper sealing cover 12 correspondingly, and the tensile fixture clamping end 22 located below is embedded in the bottom of the columnar container 11 and extends downward and outward, that is, the lower tensile fixture clamping end 22 passes through the liquid-carrying device 1 and is fixed.

[0041] The electrochemical hydrogen charging device 3 is connected to the liquid-carrying device 1 and the tensile fixture 2. Specifically, as shown in Figure 4As shown, the electrochemistry hydrogen charging device 3 includes a DC power supply 31 located outside the columnar container 11 and a platinum sheet 32 immersed in the electrolyte inside the columnar container 11. The anode of the DC power supply 31 is connected to the platinum sheet 32 through the first through hole 122 of the upper sealing cover 12 by an anode wire 33, and the cathode of the DC power supply 31 is connected to any one of the stretching fixture heads 21 inside the columnar container 11 by a cathode wire 34. The cathode wire 34 generally extends in from between the columnar container 11 and the upper sealing cover 12.

[0042] The temperature control device 4 is detachably installed outside the liquid-carrying device 1 for the liquid-carrying device 1 to simulate test environments at different temperatures.

[0043] More specifically, as Figure 7 shown, the temperature control device 4 includes an aluminum metal shell 41, a thermocouple 42 and a temperature adjustment device 43. One side of the aluminum metal shell 41 is provided with a receiving cavity capable of placing the liquid-carrying device 1, and the bottom of the receiving cavity is provided with a lower opening 411 for the lower stretching fixture clamping end 22 below to extend downward and outward; the bottom of the other side of the aluminum metal shell 41 is provided with a mounting groove 412 for installing the thermocouple 42 and the temperature adjustment device 43. The thermocouple 42 and the temperature adjustment device 43 can be placed in the mounting groove 412 after being bonded with ceramic glue and buried with ceramic glue; the measuring end of the thermocouple 42 and the temperature adjustment end of the temperature adjustment device 43 both extend into the receiving cavity in a sealed manner. A second through hole and a third through hole are provided on the outside of the mounting groove 412. The first lead wire 413 connected to the thermocouple 42 is led out through the second through hole and externally connected to a temperature display instrument, and the second lead wire 414 connected to the temperature adjustment device 43 is led out through the third through hole and externally connected to a control power supply.

[0044] Furthermore, the temperature adjustment device 43 is a thermal resistor or a refrigeration sheet. The thermal resistor or the refrigeration sheet heats or cools the temperature control medium injected into the receiving cavity and outside the liquid-carrying device. The temperature of the temperature control medium is adjusted by adjusting the power of the control power supply, and then the temperature of the test environment inside the liquid-carrying device is adjusted. The temperature adjustment range is -40°C to 100°C, which can widely simulate the service environment of metal materials.

[0045] At the same time, an embedding groove for restricting the installation position of the columnar container is provided at the center of the bottom of the receiving cavity, and a second sealing ring is arranged around the groove wall of the embedding groove to prevent the electrolyte in the columnar container 11 from leaking out from here or the temperature control medium from infiltrating in from here.

[0046] During the test process, the liquid-carrying device 1 and the temperature control device 4 are supported by an external support frame, and the two stretching fixture clamping ends 22 are respectively connected to the upper and lower chucks of a universal tensile testing machine in a corresponding manner.

[0047] Moreover, the temperature control device 4 in the present utility model is detachable and can be removed during room temperature testing, which is more convenient for the test.

[0048] On the basis of a universal tensile testing machine, the utility model designs a multi-functional dynamic hydrogen charging test device to achieve the purpose of stretching while charging hydrogen. It can not only avoid the platform damage caused by the direct contact between the electrolyte and the universal tensile testing machine, but also solve the problems of limited hydrogen charging content and hydrogen overflow. The device has a simple structure, is easy to operate, has a wide applicability, and can simulate the actual working conditions to the greatest extent.

[0049] In a further specific embodiment, the upper sealing cover 12 is installed at the top end of the columnar container 11 through connecting bolts. As Figure 6 shown, connection holes corresponding to the connecting bolts are provided on the periphery of the upper sealing cover 12. Bolt connection has the characteristics of being convenient for disassembly and assembly.

[0050] Moreover, a first sealing ring is adaptively installed between the bottom surface of the outer ring of the upper sealing cover 12 and the top surface of the columnar container 11. A sealing ring limiting groove adapted to the first sealing ring is provided on the bottom surface of the outer ring of the upper sealing cover 12, thereby ensuring the sealed connection between the upper sealing cover 12 and the top surface of the columnar container and preventing liquid leakage here during the test.

[0051] In a further specific embodiment, both the columnar container 11 and the upper sealing cover 12 are made of transparent materials, which is convenient for observing the test situation inside the columnar container 11 during the room-temperature hydrogen charging test.

[0052] In a further specific embodiment, the sample clamping end of the tensile fixture head 21 is customized according to the shape of the metal tensile sample 5, so that the metal tensile sample 5 can be directly suspended inside the tensile fixture 2, which is convenient for sample installation, is not easy to form torque and bending moment, and the test results are more reliable.

[0053] In a further specific embodiment, the tensile fixture head 21 and the corresponding tensile fixture clamping end 22 are connected in the form of internal thread matching external thread. In the utility model, an internal thread for installing the tensile fixture head 21 is provided inside the tensile fixture clamping end 22, and an external thread for installing the tensile fixture clamping end 22 is provided outside the tensile fixture head 21.

[0054] The tensile fixture 2 and the metal tensile sample 5 in the utility model can be designed according to different working conditions, and the test is more flexible and diverse.

[0055] In a further specific embodiment, the outer wall of the tensile fixture clamping end 22 is coated with an insulating coating to prevent electric leakage during the test and cause potential safety hazards.

[0056] In a further specific embodiment, the gauge section and the arc transition section of the metal tensile specimen 5 are located inside the columnar container 11, and both the gauge section and the arc transition section are immersed in the electrolyte inside the columnar container 11, ensuring that the test section of the metal tensile specimen 5 is completely in the test state.

[0057] The working principle of the present utility model:

[0058] When performing a dynamic hydrogen charging tensile test, the upper and lower clamping ends of the tensile fixture 2 are connected and fixed to a universal tensile testing machine, and the metal tensile specimen 5 is suspended inside the tensile fixture 2, ensuring that the test is in a vertical state and not under force. Then, electrolyte is poured into the columnar container 11 to immerse the gauge section and the arc transition section of the metal tensile specimen 5, and finally, the electrochemical hydrogen charging device 3 is connected.

[0059] If heating is required, before connecting to the universal tensile testing machine, the temperature control device 4 is first installed. After the temperature control device 4 is completely installed, first pour electrolyte into the columnar container 11, and then inject a temperature control medium into the accommodation cavity. Start the temperature control device 4, heat the electrolyte to a preset temperature using the water bath inside it, and then start the electrochemical hydrogen charging device 3. During this process, a large amount of hydrogen can be observed to precipitate from the surface of the metal tensile specimen 5. According to the experimental requirements, start the universal tensile testing machine until the metal tensile specimen 5 breaks.

[0060] The actual test results show that the device of the present utility model is simple to operate, can effectively simulate the actual working conditions, protect the universal tensile testing machine from the corrosion of the electrolyte, and has no safety hazards. Under the condition of ensuring the hydrogen concentration, the hydrogen overflow is reduced, the hydrogen charging time and current can be accurately controlled, and the unique specimen fixture style reduces the bending moment and torque generated during the installation process, making the test parameters more accurate and reliable. At the same time, according to different service conditions, the test environment can also be flexibly processed.

[0061] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0062] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multifunctional dynamic hydrogen charging test device, characterized in that: It comprises a liquid carrying device, a stretching fixture, an electrochemical hydrogen charging device and a temperature control device; the liquid carrying device comprises a columnar container and an upper sealing cover installed on the top of the columnar container, the upper sealing cover is provided with an upper opening for placing the stretching fixture and a first through hole for the electrochemical hydrogen charging device to pass through; the stretching fixture comprises an upper and an lower stretching fixture head, the two stretching fixture heads correspondingly clamp a metal stretching specimen, each of the stretching fixture heads is correspondingly connected to a stretching fixture clamping end on one side away from the metal stretching specimen, the stretching fixture clamping end located at the upper end corresponds to the upper opening extending out of the upper sealing cover, and the stretching fixture clamping end located at the lower end is embedded in the bottom of the columnar container and extends toward the The electrochemical hydrogen charging device comprises a DC power supply located outside the columnar container and a platinum sheet immersed in the electrolyte inside the columnar container, the anode of the DC power supply is connected to the platinum sheet through the first through hole of the upper sealing cover via an anode wire, and the cathode of the DC power supply is connected to any one of the stretching fixture heads in the columnar container via a cathode wire; the temperature control device can be detachably mounted on the outside of the liquid carrying device to simulate a test environment of different temperatures for the liquid carrying device; during the test, the liquid carrying device and the temperature control device are supported by an external support frame, and the two clamping ends of the stretching fixtures are respectively connected to the upper and lower clamps of the universal tensile testing machine.

2. A multifunctional dynamic hydrogen charging test device according to claim 1, characterized in that: The upper sealing cover is installed on the top of the columnar container by connecting bolts, and a first sealing ring is adapted and installed between the outer ring bottom surface of the upper sealing cover and the top surface of the columnar container, and a sealing ring limiting groove adapted to the first sealing ring is opened on the outer ring bottom surface of the upper sealing cover.

3. A multifunctional dynamic hydrogen charging test device according to claim 1, characterized in that: The columnar container and the upper sealing cover are both made of transparent materials.

4. A multifunctional dynamic hydrogen charging test device according to claim 1, characterized in that: The sample clamping end of the tensile fixture head is customized according to the shape of the metal tensile sample.

5. A multifunctional dynamic hydrogen charging test device according to claim 1 or 4, characterized in that: The stretching fixture head is connected to the corresponding stretching fixture clamping end in the form of internal thread and external thread.

6. A multifunctional dynamic hydrogen charging test device according to claim 1, characterized in that: The outer wall of the clamping end of the tensile clamp is coated with an insulating coating.

7. A multifunctional dynamic hydrogen charging test device according to claim 1, characterized in that: The gauge section and the arc transition section of the metal tensile test specimen are located inside the columnar container, and both the gauge section and the arc transition section are immersed in the electrolyte in the columnar container.

8. A multifunctional dynamic hydrogen charging test device according to claim 1, characterized in that: The temperature control device includes an aluminum metal shell, a thermocouple and a temperature regulating device. One side of the aluminum metal shell is provided with a accommodating cavity in which the liquid carrying device can be placed, and the bottom of the accommodating cavity is provided with a lower opening for the clamping end of the stretching clamp below to extend downward and outward; the bottom of the other side of the aluminum metal shell is provided with an installation groove for installing the thermocouple and the temperature regulating device, the measuring end of the thermocouple and the temperature regulating end of the temperature regulating device are both sealed and extended into the accommodating cavity, and a second through hole and a third through hole are provided on the outside of the installation groove, the first lead wire connected to the thermocouple is led out through the second through hole and externally connected to the temperature display, and the second lead wire connected to the temperature regulating device is led out through the third through hole and externally connected to the control power supply.

9. A multifunctional dynamic hydrogen charging test device according to claim 8, characterized in that: The temperature regulating device is a thermal resistor or a refrigeration plate, which heats or cools the temperature control medium injected into the containing cavity and outside the liquid carrier device. The temperature of the temperature control medium is adjusted by adjusting the power of the control power supply, thereby adjusting the test environment temperature in the liquid carrier device. The temperature adjustment range is -40℃ to 100℃.

10. A multifunctional dynamic hydrogen charging test device according to claim 8 or 9, characterized in that: An embedding groove for limiting the installation position of the columnar container is provided at the center of the bottom of the accommodating cavity, and a second sealing ring is arranged around the groove wall of the embedding groove.

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