Multi-mode multi-channel in-situ electrochemical measurement apparatus and method for simulating extreme environments

Abstract

This invention relates to a multi-mode, multi-channel in-situ electrochemical measurement device and method for simulating extreme environments. The loading assembly includes a pull rod, and the high-pressure reactor is equipped with an in-situ strain measurement assembly comprising an upper insulating clamp, a lower insulating clamp, an extensometer clamp, and an in-situ strain detection device. The sample is fixedly connected at both ends to the upper and lower insulating clamps, respectively. The upper insulating clamp is fixedly connected to the pull rod, and the lower insulating clamp is fixed within the high-pressure reactor. The in-situ strain detection device is located at the top of the high-pressure reactor and connected to the extensometer clamp on the sample via a rigid connecting rod. The sample and all electrochemical detection elements in the high-pressure reactor are connected to a multi-channel electrochemical workstation. The high-pressure reactor controls the dissolved oxygen concentration through an oxygen control assembly, the pressure through a booster pump, and the temperature through a temperature control device. This invention can simulate various conditions such as high hydrostatic pressure, low oxygen, and multiple external load coupling, and enables multi-channel in-situ electrochemical detection.

Description

Technical Field

[0001] This invention relates to the field of materials environmental corrosion testing technology, specifically a multi-mode, multi-channel in-situ electrochemical measurement device and method for simulating extreme environments. Background Technology

[0002] Many extreme environments can cause multiple forms of extreme damage to critical metal materials in equipment. For example, in the deep sea environment, the hydrostatic pressure increases dramatically with increasing depth, rising by approximately 0.1 MPa for every 10 m of depth. In deep-sea areas below 3000 m, the hydrostatic pressure can exceed 30 MPa. High hydrostatic pressure not only alters the stability of corrosion product films on metal surfaces and affects the cathodic reaction process, but it also couples with external load stress, thereby accelerating stress corrosion cracking and hydrogen-induced cracking of the material.

[0003] Furthermore, in the deep sea, the dissolved oxygen content in deep waters varies significantly with depth, and in some areas, the dissolved oxygen content in deep seawater can drop below 1 mg / L. This low-oxygen environment destabilizes the metal passivation film that relies on dissolved oxygen for maintenance, causing the metal to transition from a passivated state to an active corrosion state, fundamentally altering the type and rate of corrosion.

[0004] Finally, because key components of deep-sea equipment are frequently subjected to complex external loads such as tension, compression, and cyclic loading during service, coupled with the corrosive effects of seawater, they are highly susceptible to catastrophic failures such as stress corrosion cracking (SCC) and corrosion fatigue (CF). Studies have shown that there is a strong synergistic effect between the mechanical properties and electrochemical behavior of materials in deep-sea environments, and examining either factor alone is insufficient to reflect the true service condition of materials in extreme deep-sea environments.

[0005] Therefore, in order to accurately reveal the failure mechanism of key materials in deep-sea equipment during service, it is urgent to develop a device that can simulate various conditions such as high hydrostatic pressure, low oxygen, and multiple external load coupling, and on this basis, realize multi-channel in-situ electrochemical detection. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-mode, multi-channel in-situ electrochemical measurement device and method for simulating extreme environments. It can simulate various conditions such as high hydrostatic pressure, low oxygen, and multiple external load coupling, and on this basis, it can realize multi-channel in-situ electrochemical detection.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A multi-mode, multi-channel in-situ electrochemical measurement device simulating extreme environments includes a main frame, with a loading assembly at the upper end and a high-pressure reactor at the lower end. The loading assembly has a height-adjustable pull rod, and the high-pressure reactor has an in-situ strain measurement assembly. The in-situ strain measurement assembly includes an upper insulating clamp, a lower insulating clamp, an extensometer clamp, and an in-situ strain detection device. The upper end of the sample is fixedly connected to the upper insulating clamp, and the lower end is fixedly connected to the lower insulating clamp. The upper insulating clamp is fixedly connected to the pull rod, and the lower insulating clamp is fixedly disposed in the high-pressure reactor. The extensometer clamp includes two clamping plates that can open and close. The clamp plate is provided with an insulating sleeve that contacts the corresponding side end of the sample; the in-situ strain detection device is located at the upper end of the high-pressure reactor and is connected to the clamp plate corresponding to the extensometer clamp via a rigid connecting rod; the high-pressure reactor is provided with multiple electrochemical detection elements, and the sample and each electrochemical detection element are connected to a multi-channel electrochemical workstation via a multi-core electrochemical cable bundle; the high-pressure reactor is provided with an aeration head, and the aeration head supplies non-oxygen gas through an oxygen control component; the high-pressure reactor is connected to a booster pump via a pressure regulating pipeline, and a pressure control valve is provided on the pressure regulating pipeline; the high-pressure reactor controls its internal temperature via a temperature control device.

[0009] The main frame is equipped with a tie rod pressure balancing assembly, which is located between the loading assembly and the high-pressure reactor. The tie rod pressure balancing assembly includes a piston cylinder, a fixed frame, a movable frame, and a pressure balancing pipeline. The fixed frame is fixedly installed in the main frame, and a guide sleeve for the tie rod to pass through is provided in the middle of the fixed frame. The middle part of the movable frame is fixedly connected to the tie rod. The piston cylinder is installed on the fixed frame, and the piston rod at its lower end is connected to the movable frame. The interior of the piston cylinder is connected to the interior of the high-pressure reactor through the pressure balancing pipeline.

[0010] The loading assembly includes a lifting loading device, a loading platform, and a load sensor. The loading platform is driven to lift and lower by the lifting loading device. The load sensor is located on the lower side of the loading platform and is fixedly connected to the tie rod.

[0011] The high-pressure reactor includes a sealing cover and a reactor body, wherein the sealing cover is fixed in the main frame and the reactor body is adjustable in height in the main frame.

[0012] The sealing cover plate is provided with a first sealing element for the pull rod to pass through and a second sealing element for the rigid connecting rod to pass through. In addition, the sealing cover plate is provided with multiple sealing mounting holes.

[0013] The sealing cover plate is provided with a wire harness sealing channel, and the wire harness sealing channel has multiple channel holes; the multi-core electrochemical cable bundle includes multiple cables, and each cable leading out from one end of the multi-core electrochemical cable bundle is inserted into the corresponding channel hole and extends into the high-pressure reactor; a third sealing element is provided at the end of the wire harness sealing channel away from the sealing cover plate, and the multi-core electrochemical cable bundle is fixed to the third sealing element; each cable leading out from the other end of the multi-core electrochemical cable bundle is connected to the corresponding terminal on the multi-channel electrochemical workstation through a corresponding clamp interface; the electrochemical detection element in the high-pressure reactor includes a reference electrode and a counter electrode; in addition, at least one sample is provided in the high-pressure reactor.

[0014] The upper insulating clamp has a first screw hole on its lower side that connects to the upper end of the sample, and the lower insulating clamp has a second screw hole on its upper side that connects to the lower end of the sample; the upper side of the upper insulating clamp is threadedly connected to the lower end of the pull rod; the high-pressure reactor is provided with a clamp mounting base, and the lower side of the lower insulating clamp is fixedly connected to the clamp mounting base.

[0015] The oxygen control assembly includes a gas source, a dissolved oxygen sensor, and an oxygen concentration controller. The gas source is connected to the high-pressure reactor via an inlet pipe, and a control valve is provided on the inlet pipe. The dissolved oxygen sensor is located inside the high-pressure reactor, and the oxygen concentration controller, which receives the signal from the dissolved oxygen sensor, is located outside the high-pressure reactor and is electrically connected to the control valve. A resistance wire sleeve is provided on the wall of the high-pressure reactor, and the resistance wire inside the resistance wire sleeve is energized by the temperature control device.

[0016] A method for using a multi-mode, multi-channel in-situ electrochemical measurement device simulating extreme environments includes the following steps:

[0017] Step 1: Install the sample and make electrical connections inside the high-pressure reactor, then close the high-pressure reactor;

[0018] Step 2: Inject the corrosive medium into the high-pressure reactor to the set liquid level, then start the oxygen control component to introduce non-oxygen gas into the high-pressure reactor and stabilize the dissolved oxygen content of the corrosive medium to the set value.

[0019] Step 3: The temperature control device is activated to stabilize the internal temperature of the high-pressure reactor at the set temperature, and the booster pump and pressure control valve are activated to stabilize the hydrostatic pressure inside the high-pressure reactor at the set value.

[0020] Step 4: The loading component starts to drive the pull rod to move and applies the corresponding type of stress load to the sample according to the test requirements. At the same time, the multi-channel electrochemical workstation performs multi-channel synchronous in-situ electrochemical monitoring of the sample, and the in-situ strain detection device detects the small deformations generated by the sample during the stretching or compression process.

[0021] Step one is as follows:

[0022] 1. Thread the upper end of the sample to the upper insulating clamp and the lower end to the lower insulating clamp.

[0023] Second: The body of the high-pressure reactor is lowered to a set height, and then the pull rod passes through the sealing cover and is lowered to a set height. Then the sample, the combination of the upper insulating clamp and the lower insulating clamp are sent into the high-pressure reactor, and the upper end of the upper insulating clamp is threaded to the lower end of the pull rod.

[0024] 3. The pull rod continues to descend until the lower side of the lower insulating clamp contacts the clamp mounting seat located inside the high-pressure reactor, and then the connection between the lower insulating clamp and the clamp mounting seat is completed.

[0025] 4. Electrically connect the sample and each electrochemical detection element to the corresponding cable introduced into the high-pressure reactor by the multi-core electrochemical cable bundle;

[0026] 5. Clamp the two clamping plates of the extensometer fixture to both ends of the sample respectively;

[0027] 6. Connect the lower end of the rigid connecting rod to the clamp plate corresponding to the extensometer clamp;

[0028] 7. The body of the high-pressure reactor rises simultaneously with the pull rod, so that the upper end of the rigid connecting rod passes through the sealing cover plate, and the reactor body and the sealing cover plate are sealed together.

[0029] 8. Connect the upper end of the rigid connecting rod to the in-situ strain detection device, and then fix the in-situ strain detection device to the upper side of the sealing cover plate.

[0030] The advantages and positive effects of this invention are as follows:

[0031] 1. This invention integrates the simulation of multiple conditions such as high hydrostatic pressure (0.1-35 MPa), low oxygen (0.1 ppm to saturated oxygen), and multi-mode external load stress (tension, compression, alternating load, etc.) in the deep sea with multi-channel in-situ electrochemical measurement. Compared with existing devices that can only simulate one or two factors, this invention can realistically reproduce the multi-factor coupled damage conditions faced by key metal components of equipment during service in extreme environments such as the deep sea.

[0032] 2. This invention incorporates a tie rod pressure balancing assembly within the main frame. Utilizing the pressure linkage between the piston cylinder cavity and the high-pressure reactor cavity, it achieves full-process automatic compensation for the axial interference thrust of the tie rod caused by hydrostatic pressure fluctuations within the high-pressure reactor. This solves the technical bottleneck of existing high-pressure SSRT test vessels where pressure fluctuations severely interfere with stress loading accuracy. This invention ensures that the tie rod remains within 1×10⁻⁶ MPa pressure conditions. -6 Force stability under slow strain rate tension of mm / s.

[0033] 3. This invention places the in-situ strain detection device (LVDT sensor) outside the high-pressure reactor. A rigid connecting rod, connected to the extensometer clamp, passes through the sealing cover plate at the top of the high-pressure reactor and is then connected to the in-situ strain detection device. This achieves a physical isolation design of "internal clamping—connecting rod conduction—external sensing," meeting the detection requirements for minute deformations in the sample gauge length. Simultaneously, it maintains the high-pressure sealing state of the high-pressure reactor and keeps the precision electronic sensing element (LVDT sensor) away from the high-temperature, high-pressure, and corrosive environment inside the reactor. This fundamentally solves the technical problems of easy damage and signal interference in existing strain measurement devices inside the reactor.

[0034] 4. This invention utilizes high-strength upper and lower insulating clamps to fix the sample. At the same time, the clamp plate of the extensometer clamp is also provided with an insulating sleeve that contacts the corresponding end of the sample gauge length, thereby ensuring the electrical insulation isolation effect of the sample. The above structure fundamentally eliminates the problems of stray current, galvanic corrosion, and electrochemical impedance spectroscopy data drift that may be introduced by traditional metal sample clamps.

[0035] 5. This invention utilizes a multi-core electrochemical cable bundle to connect samples and various electrochemical detection elements inside a high-pressure reactor to a multi-channel electrochemical workstation outside the reactor. Specifically, the invention features a cable bundle sealing channel on the sealing cover plate at the top of the high-pressure reactor. Each cable extending from one end of the multi-core electrochemical cable bundle enters the high-pressure reactor through this sealing channel. This ensures the sealing performance of the high-pressure reactor under extreme conditions of 35 MPa and 250 °C, while also guaranteeing sufficient space between the cables entering the reactor to prevent mutual interference and meet connection requirements. Furthermore, the multi-core electrochemical cable bundle can simultaneously lead out at least six independent electrochemical testing channels, enabling multi-point synchronous in-situ electrochemical monitoring of different regions of the sample or multiple parallel samples in a corrosive medium simulating deep-sea high-pressure environments. This solves the technical problem of existing devices only being able to perform single-channel electrochemical testing.

[0036] 6. This invention utilizes a lifting loading device to drive the rod to lift and lower, enabling various forms of load loading capabilities. It can cover displacement rates across multiple orders of magnitude and fatigue test frequencies ranging from 0.0001 to 2 Hz. It can also support cyclic loading test requirements for various waveforms such as sine waves, triangular waves, and trapezoidal waves. Furthermore, it can freely switch between multiple test modes such as slow strain rate tensile (SSRT), constant load stress corrosion cracking (SCC), and corrosion fatigue (CF) on the same device.

[0037] 7. This invention utilizes the threaded connection between the sample and the upper and lower insulating clamps for installation. Simultaneously, the upper insulating clamp is threadedly connected to the lower end of the pull rod for installation, while the lower insulating clamp is fixed to the clamp mounting base inside the high-pressure reactor. Considering that the sealing cover of the high-pressure reactor has many components, this invention utilizes the lifting and lowering of the reactor body to open and close the high-pressure reactor. This method can also meet the operational needs of sample installation and electrical connection inside the reactor.

[0038] 8. The present invention has multiple sealing installation holes on the sealing cover plate of the high-pressure reactor. The corresponding pipelines outside the high-pressure reactor and electrical components such as pressure sensors and temperature sensors can be threaded into the corresponding installation holes, which can further facilitate on-site installation. Unused installation holes can be sealed by threading metal sealing plugs of the corresponding specifications, thereby ensuring the sealing inside the reactor. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0040] Figure 2 for Figure 1 Schematic diagram of the tension rod pressure balance assembly.

[0041] Figure 3 for Figure 1 Schematic diagram of the in-situ strain measurement component.

[0042] Figure 4 for Figure 3 Installation diagram of the sample.

[0043] Figure 5 for Figure 1 A schematic diagram showing the connection between the multi-channel electrochemical workstation and the samples and electrochemical detection elements inside the high-pressure reactor.

[0044] Figure 6 for Figure 1 A schematic diagram of the structure of a medium- and high-pressure reactor.

[0045] Among them, 1 is the main frame; 2 is the loading assembly, 201 is the tie rod, 202 is the load sensor, 203 is the loading platform, and 204 is the lifting loading device; 3 is the tie rod pressure balance assembly, 301 is the piston cylinder, 3011 is the piston rod, 3012 is the pressure balance pipeline, 302 is the fixed frame, 3021 is the guide sleeve, 303 is the movable frame, and 3031 is the fixed sleeve; 4 is the high-pressure reactor, 401 is the sealing cover, 4011 is the first sealing element, 4012 is the second sealing element, 402 is the reactor base, 403 is the reactor body lifting device, 404 is the pressure sensor, 405 is the temperature sensor, 406 is the booster pump, 407 is the pressure control valve, and 408 is the temperature control device; 5 is the multi-channel electrochemical workstation, 501 is the reference electrode, 502 is the counter electrode, and 503 is the wire harness. 5031 is the third sealing element, 504 is the multi-core electrochemical cable bundle, 5041 is the lead-out connector, and 505 is the clamp interface; 6 is the oxygen control assembly, 601 is the gas source, 602 is the control valve, 603 is the air inlet pipe, 604 is the aeration head, 605 is the dissolved oxygen sensor, and 606 is the oxygen concentration controller; 7 is the control system; 8 is the in-situ strain measurement assembly, 801 is the in-situ strain detection device, 802 is the rigid connecting rod, 803 is the extensometer clamp, 8031 ​​is the clamp plate, 8032 is the insulating sleeve, 804 is the upper insulating clamp, 8041 is the first screw hole, 8042 is the upper insulating connecting block, 805 is the lower insulating clamp, 8051 is the second screw hole, 8052 is the lower insulating connecting block, and 806 is the clamp mounting base; 9 is the sample, 901 is the gauge length section, and 902 is the transition section. Detailed Implementation

[0046] The invention will now be described in further detail with reference to the accompanying drawings.

[0047] like Figures 1-6 As shown, the present invention includes a main frame 1, and the main frame 1 is provided with a loading component 2 at its upper end and a high-pressure reactor 4 at its lower end; as Figure 1 As shown, the loading assembly 2 is equipped with a pull rod 201 that can be raised and lowered, and the high-pressure reactor 4 is equipped with an in-situ strain measurement assembly 8; as Figure 3As shown, the in-situ strain measurement assembly 8 includes an upper insulating clamp 804, a lower insulating clamp 805, an extensometer clamp 803, and an in-situ strain detection device 801. The upper end of the sample 9 is fixedly connected to the upper insulating clamp 804, and the lower end is fixedly connected to the lower insulating clamp 805. The upper end of the upper insulating clamp 804 is fixedly connected to the pull rod 201, and the lower insulating clamp 805 is fixedly disposed in the high-pressure reactor 4. The extensometer clamp 803 includes two clamping plates 8031 ​​capable of opening and closing, and each clamping plate 8031 ​​is provided with an insulating sleeve 8032 that contacts the corresponding side end of the sample 9. The in-situ strain detection device 801 is disposed on the upper end of the high-pressure reactor 4 and connected to the clamping plate 8031 ​​corresponding to the extensometer clamp 803 via a rigid connecting rod 802. Figure 5 As shown, the high-pressure reactor 4 is equipped with multiple electrochemical detection elements, and the sample 9 and each electrochemical detection element are connected to a multi-channel electrochemical workstation 5 outside the high-pressure reactor 4 via a multi-core electrochemical cable bundle 504; Figure 6 As shown, the high-pressure reactor 4 is equipped with an aeration head 604 inside, and the aeration head 604 is supplied with air through the oxygen control component 6 outside the high-pressure reactor 4; the high-pressure reactor 4 is connected to the booster pump 406 through a pressure regulating pipeline, and a pressure control valve 407 is provided on the pressure regulating pipeline; the internal temperature of the high-pressure reactor 4 is controlled by a temperature control device 408.

[0048] In operation, the present invention first injects a corrosive medium (such as artificial seawater or 3.5wt% NaCl aqueous solution) into the high-pressure reactor 4 to the set liquid level. Then, the oxygen control component 6 is activated to introduce non-oxygen gas (such as high-purity nitrogen or argon) into the high-pressure reactor 4, and the corrosive medium is aerated through the aeration head 604, thereby stabilizing the dissolved oxygen content of the corrosive medium to the set value (low oxygen state). Then, the temperature control device 408 is activated to adjust the temperature inside the high-pressure reactor 4 (usually set to 2-10℃ in deep-sea experiments). The booster pump 406 and the pressure control valve 407 are activated to stabilize the hydrostatic pressure inside the high-pressure reactor 4 to the set value (usually set to 0.1-35 MPa in deep-sea experiments).

[0049] After the above adjustments are completed, the control system 7 activates the loading component 2 to move the tie rod 201 and apply a stress load to the sample 9. This invention can perform slow strain rate tensile testing (SSRT, strain rate 1×10⁻⁶) depending on the test type. -7 ~1×10 -3Loading methods include constant load loading (SCC, load ratio of 80-95% of the sample material's yield strength) or cyclic load loading (CF, frequency 0.0001-2 Hz, sine wave / triangular wave / trapezoidal wave). During loading, the pull rod 201 applies force to the sample 9 through the cooperation of the upper insulating clamp 804 and the lower insulating clamp 805. Simultaneously, during loading, the present invention can use the in-situ strain detection device 801 to detect the minute deformations generated by the sample 9 during tension or compression, as needed for the experiment. In this embodiment, the in-situ strain detection device 801 uses an LVDT sensor, which is a well-known technology in the art and a commercially available product. The upper end of the rigid connecting rod 802 extends to the outside of the high-pressure reactor 4 and is connected to the movable iron core in the LVDT sensor. The minute deformation of the sample 9 can be transmitted to the rigid connecting rod 802 through the opening and closing movement of the two clamping plates 8031 ​​of the extensometer clamp 803, and then to the in-situ strain detection device 801. The output signal of the in-situ strain detection device 801 is amplified and digitized by the signal conditioning circuit and then sent to the control system 7. The clamping plate 8031 ​​can adopt a suitable clamping structure as needed, such as setting the open clamp structure in patent CN206200801U on the clamping plate 8031, wherein the insulating sleeve 8032 is set on the inner side of the open clamp, and the two clamping plates 8031 ​​can be connected by a spring or other elastic element to meet the movement detection requirements after the sample 9 undergoes deformation. In addition, in this embodiment, two in-situ strain detection devices 801 (LVDT sensors) are symmetrically arranged on both sides of the upper end of the high-pressure reactor 4 to eliminate the possible influence of bending strain on the measurement results.

[0050] Since the upper insulating clamp 804, the lower insulating clamp 805, and the insulating sleeves 8032 on the two clamping plates 8031 ​​of this invention are all in insulating contact with the sample 9, this can fully guarantee the electrical isolation effect of the sample 9, thereby avoiding the stray current, galvanic corrosion, and electrochemical impedance spectroscopy data drift problems that are prone to occur between the sample 9 and the metal clamping components in the prior art. In this embodiment, the upper insulating clamp 804, the lower insulating clamp 805, and the insulating sleeves 8032 are all made of high-strength insulating materials, such as high-strength zirconia ceramic, which has a bending strength of over 1200 MPa, an operating temperature of over 800 ℃, and excellent corrosion resistance and electrical insulation (resistivity > 10). 14 Ω·cm).

[0051] like Figure 5As shown, the present invention can also perform multi-channel synchronous in-situ electrochemical monitoring of the gauge section 901 and transition section 902 of sample 9 through various electrochemical detection elements in the multi-channel electrochemical workstation 5 and the high-pressure reactor 4 during the test, such as open circuit potential, potentiodynamic polarization, potentiostatic polarization, electrochemical impedance spectroscopy, electrochemical noise, etc. All of the above detections are well known in the art.

[0052] like Figure 1 As shown, in this embodiment, the main frame 1 is provided with a tie rod pressure balancing assembly 3, and the tie rod pressure balancing assembly 3 is located between the loading assembly 2 and the high-pressure reactor 4.

[0053] like Figure 2 As shown, in this embodiment, the pull rod pressure balancing assembly 3 includes a piston cylinder 301, a fixed frame 302, a movable frame 303, and a pressure balancing pipeline 3012. The fixed frame 302 is fixedly mounted in the main frame 1, and a guide sleeve 3021 for the pull rod 201 to pass through is provided in the middle of the fixed frame 302. The middle part of the movable frame 303 is fixedly connected to the pull rod 201. In this embodiment, a fixed sleeve 3031 is provided in the middle of the movable frame 303, which is fixedly mounted on the pull rod 201. Two piston cylinders 301 are symmetrically arranged on the fixed frame 302, and the lower end of the piston cylinder 301 is provided with a retractable piston rod 3011. The end of the piston rod 3011 is connected to the movable frame 303. The inside of the piston cylinder 301 is connected to the inside of the high-pressure reactor 4 through the pressure balancing pipeline 3012, thereby ensuring that the internal pressure of the two is always the same. When the hydrostatic pressure inside the high-pressure reactor 4 changes, the internal pressure of the piston cylinder 301 also changes simultaneously. The thrust acting on the piston rod 21 at the cylinder's internal cross-section is transmitted to the tie rod 201 via the movable frame 303. This thrust is opposite in direction and equal in magnitude to the axial thrust generated by the internal pressure of the high-pressure reactor 4 on the lower end of the tie rod 7, thus achieving real-time pressure compensation. This effectively eliminates the impact of hydrostatic pressure fluctuations inside the high-pressure reactor 4 on the stress loading accuracy of the tie rod 201, especially ensuring a pressure accuracy within 1×10⁻⁶ rpm. -6 Under slow strain rate tensile conditions of mm / s, the load value of the tie rod 201 is highly stable.

[0054] like Figure 1As shown, in this embodiment, the loading component 2 includes a lifting loading device 204, a loading platform 203, and a load sensor 202. The loading platform 203 is driven to lift and lower via the lifting loading device 204. The load sensor 202 is located on the lower side of the loading platform 203 and is fixedly connected to the pull rod 201. The load sensor 202 is a commercially available product and is known in the art; it is used to detect the loading force value of the pull rod 201 in real time. Furthermore, the loading platform 203 can be slidably connected to the main frame 1 via a first slider rail assembly, thereby ensuring vertical lifting and smooth lifting. In this embodiment, the loading platform 203 is provided with a first slider, and the main frame 1 is provided with a first rail along the height direction that cooperates with the slider. The lifting loading device 204 can adopt a suitable structure or device as needed, such as an electric push rod, a screw jack, or other devices that can precisely control the lifting distance and speed; this is known in the art and is a commercially available product.

[0055] The loading displacement rate range of the lifting loading device 204 of the present invention is 10 mm / s to 1×10 -6 The fatigue loading frequency range of the reciprocating movement is 0.0001 to 2 Hz, the loading displacement resolution is 0.01 μm, the force value resolution of the load sensor 202 is 0.3 N, and a high-precision spoke-type load sensor can be selected with a maximum range of not less than 50 kN.

[0056] like Figure 1 As shown, in this embodiment, the high-pressure reactor 4 includes a sealing cover plate 401 and a reactor body, wherein the sealing cover plate 401 is fixed in the main frame 1, and the reactor body is slidably disposed in the main frame 1; a reactor body lifting device 403 is provided on the outside of the main frame 1, and the reactor body is driven to rise and fall by the reactor body lifting device 403. Figure 3 , Figure 5 and Figure 6 As shown, since multiple components need to be installed on the sealing cover 401, the sealing cover 401 is fixedly set to ensure the installation of corresponding pipelines and cable components. This invention utilizes the lifting and lowering of the vessel body itself to realize the opening and closing of the high-pressure reactor 4, thereby meeting the needs of sample 9 disassembly, assembly, wiring, and other operations. The vessel lifting device 403 can adopt a suitable device as needed, such as a motor screw and nut structure, wherein the screw is parallel to one side of the high-pressure reactor 4 and is driven to rotate by a motor, and the nut is fitted on the screw and connected to the vessel body. In addition, the vessel body can be slidably connected to the main frame 1 through a second slide rail slider assembly, wherein the vessel body is provided with a second slider, and the main frame 1 is provided with a second slide rail that cooperates with the second slider.

[0057] like Figure 3As shown, in this embodiment, the sealing cover plate 401 is provided with a first sealing element 4011 through which the pull rod 201 slides and passes, and a second sealing element 4012 through which the rigid connecting rod 802 slides and passes. The first sealing element 4011 and the second sealing element 4012 can adopt structures such as sealing bushings suitable for high-pressure corrosive media. This is a well-known technology in the art and a commercially available product.

[0058] like Figure 5 As shown, in this embodiment, the sealing cover plate 401 is provided with a wire harness sealing channel 503, and the wire harness sealing channel 503 is provided with multiple channel holes; the multi-core electrochemical cable bundle 504 includes multiple cables, and each cable leading out from one end of the multi-core electrochemical cable bundle 504 enters the wire harness sealing channel 503 and is inserted into the corresponding channel hole, thereby ensuring that each cable entering the high-pressure reactor 4 has sufficient distance and space to avoid mutual interference and meet the wiring requirements. At the same time, the end of the wire harness sealing channel 503 away from the sealing cover plate 401 is provided with a third sealing element 5031 to ensure the sealing inside the wire harness sealing channel 503, thereby ensuring the sealing inside the reactor. The end of the multi-core electrochemical cable bundle 504 can be fixed to the third sealing element 5031.

[0059] In this embodiment, the third sealing element 5031 can be a sealing seat structure threaded into the wire harness sealing channel 503, with its lower end being a conical seal or a lens gasket seal. Simultaneously, the end of the multi-core electrochemical cable bundle 504 is also threaded into the sealing seat. In this embodiment, each cable leading out from the other end of the multi-core electrochemical cable bundle 504 can be connected to the corresponding terminal on the multi-channel electrochemical workstation 5 via a corresponding clamp interface 505, such as... Figure 5 As shown, in this embodiment, the other end of the multi-core electrochemical cable bundle 504 is fixed to a lead-out connector 5041, and each cable is led out from the lead-out connector 5041. The lead-out connector 5041 can be installed in a suitable position on the device. In this embodiment, the multi-core electrochemical cable bundle 504 can be a high-temperature resistant and corrosion-resistant insulated cable bundle with no less than 6 cores, capable of withstanding operating temperatures above 250°C. The clamp interface 505 can be an alligator clip interface, and each clamp interface 505 has independent shielding to avoid crosstalk between channels. Both the multi-core electrochemical cable bundle 504 and the clamp interface 505 are commercially available products.

[0060] Other examples Figure 5As shown, in this embodiment, the electrochemical detection element inside the high-pressure reactor 4 includes a reference electrode 501 and a counter electrode 502. During operation, the gauge section 901 of sample 9 (as the main working electrode), the transition section 902 of sample 9 (as the auxiliary working electrode), the reference electrode 501 (using a reference electrode suitable for high-pressure conditions), and the counter electrode 502 (a platinum wire or platinum mesh electrode) are electrically connected to the corresponding cables introduced into the high-pressure reactor 4 by the multi-core electrochemical cable bundle 504. This allows the invention to achieve multi-point synchronous in-situ electrochemical monitoring of different regions of sample 9 or multiple parallel samples 9 under the same stress loading and medium environment through the multi-channel electrochemical workstation 5. The electrochemical measurements include open-circuit potential, potentiodynamic polarization, potentiostatic polarization, electrochemical impedance spectroscopy, and electrochemical noise.

[0061] Among them, such as Figure 4 As shown, in this embodiment, the upper insulating clamp 804 has a first screw hole 8041 on its lower side, and the lower insulating clamp 805 has a second screw hole 8051 on its upper side. The upper end of the sample 9 is threaded into the first screw hole 8041, and the lower end is threaded into the second screw hole 8051. When testing multiple parallel samples 9, multiple first screw holes 8041 can be provided on the upper insulating clamp 804, and multiple second screw holes 8051 can be provided on the lower insulating clamp 805. The upper end of each sample 9 is threaded into the corresponding first screw hole 8041, and the lower end is threaded into the corresponding second screw hole 8051. This not only meets the installation requirements of multiple samples 9, but also ensures the parallel arrangement of each sample 9.

[0062] like Figure 4 As shown, in this embodiment, the upper insulating clamp 804 has an upper insulating connecting block 8042 on its upper side, and the lower end of the pull rod 201 is threadedly connected to the upper insulating connecting block 8042. The lower insulating clamp 805 has a lower insulating connecting block 8052 on its lower side, and additionally... Figure 1 As shown, a clamp mounting base 806 is fixedly provided on the reactor base 402 of the high-pressure reactor 4, and the lower insulating connecting block 8052 is fixedly connected to the clamp mounting base 806.

[0063] like Figure 6 As shown in this embodiment, the sealing cover plate 401 has multiple pre-drilled sealing mounting holes, such as electrode mounting holes (for mounting reference electrodes and counter electrodes), temperature measurement mounting holes (for mounting temperature sensors), pressure measurement mounting holes (for mounting pressure sensors), gas inlet / outlet holes (for connecting pressure regulating pipelines, oxygen control component inlet pipelines, exhaust pipelines, etc.), and liquid injection / drainage holes (for connecting corrosive medium input pipelines, corrosive medium output pipelines, etc.). Unused mounting holes can be sealed using threaded metal sealing plugs of the corresponding specifications.

[0064] like Figure 1 and Figure 6 As shown, in this embodiment, the aeration head 604 is a microporous aeration head to ensure that the introduced non-oxygen gas diffuses uniformly and rapidly in the corrosive medium. The oxygen control component 6 includes a gas source 601, a dissolved oxygen sensor 605, and an oxygen concentration controller 606. The gas source 601 is connected to the aeration head 604 through an air inlet pipe 603, and a control valve 602 is provided on the air inlet pipe 603. The dissolved oxygen sensor 605 is located inside the high-pressure reactor 4 to detect the dissolved oxygen content in the corrosive medium in real time. The oxygen concentration controller 606 is used to receive the real-time signal from the dissolved oxygen sensor 605 and control the control valve 602 to regulate the gas supply, thereby achieving dynamic adjustment of the dissolved oxygen content in the corrosive medium within the range of 0.5 ppm to saturated oxygen. In this embodiment, the gas source 601 is a high-purity nitrogen cylinder (content not less than 99.999%), a high-purity argon cylinder, or a high-purity oxygen cylinder. Furthermore, the oxygen concentration controller 606 and the booster pump 406 are both electrically connected to the control system 7. The high-pressure reactor 4 is equipped with an exhaust pipe for venting. The aeration head 604, dissolved oxygen sensor 605, oxygen concentration controller 606, and control valve 602 are all commercially available products.

[0065] like Figure 6 As shown, in this embodiment, a resistance wire sleeve is provided on the wall of the vessel body. The temperature control device 408 realizes the heating function by controlling the resistance wire in the resistance wire sleeve to be energized, and can adjust the heating temperature of the resistance wire sleeve in a timely manner according to the detection of the temperature sensor 405. This is a well-known technology in the art.

[0066] The working principle of this invention is as follows:

[0067] The present invention includes the following steps in operation:

[0068] Step 1: Install and electrically connect sample 9 inside high-pressure reactor 4, specifically as follows:

[0069] 1. Thread the upper end of sample 9 to the upper insulating clamp 804 and the lower end to the lower insulating clamp 805.

[0070] Second: The body of the high-pressure reactor 4 is lowered to the set height. At this time, the high-pressure reactor 4 is opened. Then, the pull rod 201 passes through the sealing cover plate 401 and is lowered to the set height. Then, the sample 9, the upper insulating clamp 804 and the lower insulating clamp 805 are sent into the high-pressure reactor 4, and the upper insulating connecting block 8042 at the upper end of the upper insulating clamp 804 is threadedly connected to the lower end of the pull rod 201.

[0071] Third: The pull rod 201 continues to descend until the lower insulating connecting block 8052 can contact the clamp mounting base 806 and complete the connection.

[0072] 4. Electrically connect the sample 9, reference electrode 501, counter electrode 502, etc., to the corresponding cables introduced into the high-pressure reactor 4 by the multi-core electrochemical cable bundle 504.

[0073] 5. Securely clamp the two clamping plates 8031 ​​of the extensometer clamp 803 to both ends of the gauge length section 901 of the sample 9.

[0074] 6. Connect the lower end of the rigid connecting rod 802 to the clamp plate 8031 ​​of the extensometer clamp 803.

[0075] 7. The body of the high-pressure reactor 4 rises, and the pull rod 201 rises in sync. On the one hand, the upper end of the rigid connecting rod 802 passes through the corresponding sealing element on the sealing cover plate 401, and on the other hand, the reactor body rises and seals with the sealing cover plate 401.

[0076] 8. Connect the upper end of the rigid connecting rod 802 to the movable iron core inside the in-situ strain detection device 801, and then fix the in-situ strain detection device 801 to the upper side of the sealing cover plate 401. In this embodiment, a flange may be provided at the lower end of the in-situ strain detection device 801, and the flange is fixed to the sealing cover plate 401 by bolts.

[0077] Step 2: Inject a corrosive medium (such as artificial seawater or 3.5wt% NaCl aqueous solution) into the high-pressure reactor 4 to the set liquid level, and then start the oxygen control component 6 to introduce non-oxygen gas (such as high-purity nitrogen or argon) into the high-pressure reactor 4, and blow gas into the corrosive medium through the aeration head 604, thereby stabilizing the dissolved oxygen content of the corrosive medium to the set value (low oxygen state).

[0078] Step 3: The temperature control device 408 is activated to adjust the temperature inside the high-pressure reactor 4 (usually set to 2-10℃ for deep-sea experiments). The booster pump 406 and the pressure control valve 407 are activated to stabilize the hydrostatic pressure inside the high-pressure reactor 4 to the set value (usually set to 0.1-35 MPa for deep-sea experiments).

[0079] Step 4: Loading component 2 activates the drive to move the tie rod 201 and applies the appropriate type of stress load to sample 9 according to the test requirements. For example, applying slow strain rate tension (SSRT, strain rate 1×10⁻⁶). -7 ~1×10 -3The system can perform various load loading methods, including constant load loading (SCC, load ratio of 80-95% of the yield strength of the sample material), cyclic load loading (CF, frequency 0.0001-2Hz, sine wave / triangular wave / trapezoidal wave), etc. At the same time, the multi-channel electrochemical workstation 5 performs multi-channel synchronous in-situ electrochemical monitoring of the sample 9 according to the experimental requirements, and the in-situ strain detection device 801 detects the minute deformation of the sample 9 during the tensile or compressive process in real time according to the experimental requirements.

[0080] The following application examples further illustrate the working principle of this invention.

[0081] Application Example 1: Simulation of a multi-channel in-situ slow strain rate tensile stress corrosion test on TC4 titanium alloy in a 2000 m deep-sea environment.

[0082] Sample 9 in this application example is a bar-shaped tensile specimen of TC4 titanium alloy (Ti-6Al-4V), with a gauge length of 25 mm and a diameter of 5 mm, and threaded sections at both ends for connection with insulating clamps.

[0083] The corrosive medium in this application example is a 3.5 wt% NaCl aqueous solution.

[0084] The experimental parameters set in this application example are as follows: internal hydrostatic pressure of high-pressure reactor 4: 20 MPa (simulating hydrostatic pressure at a depth of 2000 m in the deep sea); dissolved oxygen content: 2.0 ppm (simulating a low-oxygen environment in the deep sea); strain rate of tension rod 201: 1 × 10⁻⁶. -6 s -1 The multi-channel electrochemical workstation 5 connects the gauge section 901 (main working electrode) of sample 9, the transition section 901 (auxiliary working electrode) of sample 9, the reference electrode 501 (a solid Ag / AgX electrode in this application example) and the counter electrode 502 (a platinum sheet electrode in this application example).

[0085] The electrochemical testing items in this application example are: continuous monitoring of open-circuit potential and periodic acquisition of electrochemical impedance spectroscopy.

[0086] Test procedure: After clamping and adjusting the environment of sample 9 according to steps one to three above, the control system 7 controls the movement of the starting lever 201 to achieve slow strain rate tensile loading. At the same time, the multi-channel electrochemical workstation 5 is started to continuously monitor the open circuit potential and periodically test the electrochemical impedance spectroscopy of sample 9 in gauge section 901 and transition section 902.

[0087] Test results: TC4 titanium alloy was successfully tested under high hydrostatic pressure of 20 MPa, low oxygen conditions of 2.0 ppm, and 1×10⁻⁶ ppm. -6 s -1The stress-strain curves, mechanical property parameters (yield strength, tensile strength, elongation), and the synchronous evolution of electrochemical behavior in gauge length segment 901 and transition segment 902 of sample 9 under slow strain rate tensile coupling conditions were studied. The results showed that when sample 9 reached the yield plateau, the charge transfer resistance (Rct) in gauge length segment 901 decreased significantly, indicating that the high stress-corrosion synergistic effect is the key mechanism for stress corrosion cracking of TC4 titanium alloy in deep-sea environment. These results demonstrate that the device of this invention can capture the differences in electrochemical behavior of samples in different stress regions under deep-sea multi-factor coupled environments, providing crucial data support for in-depth research on the mechanism of deep-sea stress corrosion.

[0088] Application Example 2: Simulation of a multi-channel corrosion fatigue test of TC4 titanium alloy heat exchange pipes in a 2000 m deep-sea environment.

[0089] Sample 9 in this application example is a TC4 titanium alloy (Ti-6Al-4V), which is machined into a rod-shaped fatigue specimen with a gauge length of 10 mm and a diameter of 5 mm. Both ends are provided with threaded sections that connect to the insulating clamps.

[0090] The corrosive medium in this application example is a 3.5 wt% NaCl aqueous solution.

[0091] The test parameters for this application example are set as follows: internal temperature of high-pressure reactor 4 is 200 ℃, hydrostatic pressure is 20 MPa (simulating hydrostatic pressure at a depth of 2000 m), and dissolved oxygen content is 2 ppm (simulating ultra-low oxygen environment in the deep sea); the fatigue test load waveform of tie rod 201 is a sine wave, the maximum stress is 80% of the material yield strength, the stress ratio R=0.1, and the loading frequency is 0.1Hz; in addition to connecting the gauge segment 901 of one sample 9, the multi-channel electrochemical workstation 5 also connects two other independent parallel samples 9, as well as the reference electrode 501 (a solid Ag / AgX electrode in this application example) and the counter electrode 502 (a platinum sheet electrode in this application example), thereby forming a 3-channel parallel test including three samples 9.

[0092] The electrochemical testing items in this application example are: continuous monitoring of open circuit potential and periodic acquisition of potentiodynamic polarization curves.

[0093] The testing process in this application example is as follows: After completing the clamping and environmental conditioning of sample 9 according to steps one to three above, the control system 7 starts the movement of the pull rod 201 to achieve sinusoidal fatigue loading. At the same time, the multi-channel electrochemical workstation 5 is started to continuously monitor the open circuit potential and periodically test the potentiodynamic polarization curve.

[0094] Test Results: The fatigue life curve (SN curve) of TC4 titanium alloy under a simulated deep-sea environment at 2000 m was successfully obtained. The evolution of electrochemical behavior with fatigue cycle number was also obtained for gauge length segment 901 of sample 9 and two independent parallel samples 9. The statistical dispersion of the experimental data was effectively evaluated through three-channel parallel testing. The study found that the corrosion current density of gauge length segment 901 (subject to fatigue load) of sample 9 increased significantly with increasing fatigue cycle number, eventually exhibiting a step-like jump before crack initiation. In contrast, the corrosion current density of the independent parallel samples (subject to only high-pressure, low-oxygen corrosion and not subjected to fatigue load) increased slowly over time. This comparison clearly reveals the mechanism by which fatigue load accelerates the corrosion process of TC4 titanium alloy under high-pressure, low-oxygen conditions in the deep sea.

Claims

1. A multi-mode, multi-channel in-situ electrochemical measurement device simulating extreme environments, characterized in that: The system includes a main frame (1), with a loading assembly (2) at the upper end and a high-pressure reactor (4) at the lower end. The loading assembly (2) has a pull rod (201) that can be adjusted up and down. The high-pressure reactor (4) has an in-situ strain measurement assembly (8). The in-situ strain measurement assembly (8) includes an upper insulating clamp (804), a lower insulating clamp (805), an extensometer clamp (803), and an in-situ strain detection device (801). The sample (9) is fixedly connected at the upper end to the upper insulating clamp (804) and at the lower end to the lower insulating clamp (805). The upper insulating clamp (804) is fixedly connected to the pull rod (201), and the lower insulating clamp (805) is fixedly installed in the high-pressure reactor (4). The extensometer clamp (803) includes two clamp plates (8031) that can open and close. An insulating jacket (8032) is provided on the plate (8031) and contacts the corresponding side end of the sample (9); the in-situ strain detection device (801) is located on the upper end of the high-pressure reactor (4) and is connected to the clamp plate (8031) corresponding to the extensometer clamp (803) through a rigid connecting rod (802); the high-pressure reactor (4) is provided with multiple electrochemical detection elements, and the sample (9) and each electrochemical detection element are connected to the multi-channel electrochemical workstation (5) through a multi-core electrochemical cable bundle (504); the high-pressure reactor (4) is provided with an aeration head (604), and the aeration head (604) supplies non-oxygen gas through an oxygen control component (6); the high-pressure reactor (4) is connected to a booster pump (406) through a pressure regulating pipeline, and a pressure control valve (407) is provided on the pressure regulating pipeline; the high-pressure reactor (4) controls the internal temperature through a temperature control device (408).

2. The multi-mode, multi-channel in-situ electrochemical measurement device for simulating extreme environments according to claim 1, characterized in that: The main frame (1) is provided with a tie rod pressure balancing assembly (3), and the tie rod pressure balancing assembly (3) is located between the loading assembly (2) and the high-pressure reactor (4); the tie rod pressure balancing assembly (3) includes a piston cylinder (301), a fixed frame (302), a movable frame (303) and a pressure balancing pipeline (3012), wherein the fixed frame (302) is fixed in the main frame (1), and the middle part of the fixed frame (302) is provided with a guide sleeve (3021) for the tie rod (201) to pass through, and the middle part of the movable frame (303) is fixedly connected to the tie rod (201); the piston cylinder (301) is located on the fixed frame (302) and the piston rod (3011) at the lower end is connected to the movable frame (303), and the interior of the piston cylinder (301) is connected to the interior of the high-pressure reactor (4) through the pressure balancing pipeline (3012).

3. The multi-mode, multi-channel in-situ electrochemical measurement device for simulating extreme environments according to claim 1, characterized in that: The loading component (2) includes a lifting loading device (204), a loading platform (203) and a load sensor (202), wherein the loading platform (203) is driven to lift by the lifting loading device (204), the loading platform (203) is provided with a load sensor (202) on the lower side, and the load sensor (202) is fixedly connected to the pull rod (201).

4. The multi-mode, multi-channel in-situ electrochemical measurement device for simulating extreme environments according to claim 1, characterized in that: The high-pressure reactor (4) includes a sealing cover plate (401) and a reactor body, wherein the sealing cover plate (401) is fixed in the main frame (1) and the reactor body is adjustable in height in the main frame (1).

5. The multi-mode, multi-channel in-situ electrochemical measurement device for simulating extreme environments according to claim 4, characterized in that: The sealing cover plate (401) is provided with a first sealing element (4011) through which the pull rod (201) passes and a second sealing element (4012) through which the rigid connecting rod (802) passes. In addition, the sealing cover plate (401) is provided with a plurality of sealing mounting holes.

6. The multi-mode, multi-channel in-situ electrochemical measurement device for simulating extreme environments according to claim 4, characterized in that: The sealing cover plate (401) is provided with a wire harness sealing channel (503), and the wire harness sealing channel (503) is provided with multiple channel holes; the multi-core electrochemical cable bundle (504) includes multiple cables, and each cable leading out from one end of the multi-core electrochemical cable bundle (504) is inserted into the corresponding channel hole and extends into the high-pressure reactor (4); the end of the wire harness sealing channel (503) away from the sealing cover plate (401) is provided with a third sealing element (5031), and the multi-core electrochemical cable bundle (504) is fixed on the third sealing element (5031); each cable leading out from the other end of the multi-core electrochemical cable bundle (504) is connected to the corresponding terminal on the multi-channel electrochemical workstation (5) through the corresponding clamp interface (505); the electrochemical detection element in the high-pressure reactor (4) includes a reference electrode (501) and a counter electrode (502); in addition, at least one sample (9) is provided in the high-pressure reactor (4).

7. The multi-mode, multi-channel in-situ electrochemical measurement device for simulating extreme environments according to claim 1, characterized in that: The upper insulating clamp (804) has a first screw hole (8041) on its lower side that connects to the upper end of the sample (9), and the lower insulating clamp (805) has a second screw hole (8051) on its upper side that connects to the lower end of the sample (9); the upper side of the upper insulating clamp (804) is threadedly connected to the lower end of the pull rod (201); the high-pressure reactor (4) is provided with a clamp mounting base (806), and the lower side of the lower insulating clamp (805) is fixedly connected to the clamp mounting base (806).

8. The multi-mode, multi-channel in-situ electrochemical measurement device for simulating extreme environments according to claim 1, characterized in that: The oxygen control assembly (6) includes a gas source (601), a dissolved oxygen sensor (605), and an oxygen concentration controller (606). The gas source (601) is connected to the high-pressure reactor (4) through an inlet pipe (603), and a control valve (602) is provided on the inlet pipe (603). The dissolved oxygen sensor (605) is located inside the high-pressure reactor (4), and the oxygen concentration controller (606) that receives the signal from the dissolved oxygen sensor (605) is located outside the high-pressure reactor (4) and is electrically connected to the control valve (602). A resistance wire sleeve is provided on the wall of the high-pressure reactor (4), and the resistance wire inside the resistance wire sleeve is energized by the temperature control device (408).

9. A method for a multi-mode, multi-channel in-situ electrochemical measurement device for simulating extreme environments according to claim 4, characterized in that: Includes the following steps: Step 1: Install and electrically connect the sample (9) inside the high-pressure reactor (4), and then close the high-pressure reactor (4); Step 2: Inject the corrosive medium into the high-pressure reactor (4) to the set liquid level, and then start the oxygen control component (6) to introduce non-oxygen gas into the high-pressure reactor (4) and stabilize the dissolved oxygen content of the corrosive medium to the set value. Step 3: The temperature control device (408) is activated to stabilize the internal temperature of the high-pressure reactor (4) at the set temperature, and the booster pump (406) and pressure control valve (407) are activated to stabilize the hydrostatic pressure inside the high-pressure reactor (4) at the set value; Step 4: The loading component (2) starts to drive the pull rod (201) to move and applies the corresponding type of stress load to the sample (9) according to the test requirements. At the same time, the multi-channel electrochemical workstation (5) performs multi-channel synchronous in-situ electrochemical monitoring of the sample (9), and the in-situ strain detection device (801) detects the small deformation of the sample (9) during the stretching or compression process.

10. The method for using a multi-mode, multi-channel in-situ electrochemical measurement device to simulate extreme environments according to claim 9, characterized in that: Step one is as follows:

1. Thread the upper end of the sample (9) to the upper insulating clamp (804) and the lower end to the lower insulating clamp (805); Second: The body of the high-pressure reactor (4) is lowered to a set height, and then the pull rod (201) passes through the sealing cover plate (401) and is lowered to a set height. Then the sample (9), the combination of the upper insulating clamp (804) and the lower insulating clamp (805) is sent into the high-pressure reactor (4), and the upper end of the upper insulating clamp (804) is threaded to the lower end of the pull rod (201).

3. The pull rod (201) continues to descend until the lower side of the lower insulating clamp (805) contacts the clamp mounting seat (806) located in the high-pressure reactor (4), and then the connection between the lower insulating clamp (805) and the clamp mounting seat (806) is completed.

4. Electrically connect the sample (9) and each electrochemical detection element to the corresponding cable introduced into the high-pressure reactor (4) by the multi-core electrochemical cable bundle (504); 5. Clamp the two clamping plates (8031) of the extensometer fixture (803) to both ends of the sample (9); Six: Connect the lower end of the rigid connecting rod (802) to the clamp plate (8031) corresponding to the extensometer clamp (803); 7: The body of the high-pressure reactor (4) rises, and the pull rod (201) rises in sync, so that the upper end of the rigid connecting rod (802) passes through the sealing cover plate (401), and the body of the reactor and the sealing cover plate (401) are sealed and closed.

8. Connect the upper end of the rigid connecting rod (802) to the in-situ strain detection device (801), and then fix the in-situ strain detection device (801) to the upper side of the sealing cover plate (401).

Images