Friction corrosion test system based on deep sea environment simulation

Abstract

The invention discloses a friction corrosion test system based on deep sea environment simulation, and relates to the field of deep sea environment simulation and friction wear tests. The system comprises a deep sea environment simulation subsystem and a friction corrosion test subsystem, the deep sea environment simulation subsystem comprises a gas distribution unit, a liquid storage unit, a water chemical monitoring unit, a low-temperature high-pressure control unit and a PC data processing and control unit; the friction corrosion testing subsystem comprises a friction corrosion testing machine, the friction corrosion testing machine is connected with a low-temperature high-pressure control unit through a pipeline, the low-temperature high-pressure control unit supplies simulated deep sea water to the friction corrosion testing machine, and the friction corrosion testing machine comprises a high-pressure kettle composed of a kettle body and a kettle cover. A high-voltage electrochemical three-electrode system consisting of a working electrode, an auxiliary electrode and a reference electrode is arranged in the high-pressure kettle; and leads of the three electrodes penetrate out of the kettle body and then are respectively connected with an electrochemical workstation. According to the device, the friction corrosion test can be researched while the deep sea environment is dynamically simulated.

Description

Technical Field

[0001] The invention relates to the technical field of deep sea environment simulation and friction and wear testing, in particular to a friction and corrosion testing system based on deep sea environment simulation. Background Art

[0002] With the continuous development and utilization of deep-sea resources, the performance requirements for deep-sea equipment are becoming higher and higher. The deep-sea environment has special conditions such as high pressure, low temperature, low oxygen, and high corrosion, which have a significant impact on the friction and wear properties of materials compared to shallow sea. At present, simulating the friction and wear behavior in the deep-sea environment has become one of the important directions of future material science research. The seawater friction and wear testing machines currently on the market are mainly for normal pressure seawater environments. Although these devices have made certain progress in simulating the friction and wear behavior in seawater environments, they still have limitations in simulating deep-sea high-pressure environments.

[0003] Chinese patent CN201910198034.9 discloses a friction and wear test device under high-pressure seawater environment, which uses a container containing high-pressure seawater to inject high-pressure seawater into the friction and wear test device to carry out friction and wear experiments under pressure and medium environment. However, this technology cannot regulate the high-pressure seawater environment in real time, and the working conditions of the seawater corrosion environment are relatively single. Chinese patent CN202310265383.4 discloses a real sea dynamic friction corrosion online monitoring test system and test method, which is used for the wear-resistant, anti-corrosion and adhesion matching behavior of coatings with different materials, different roughness, different wettability and surface characteristics in the real sea environment, and provides a new online monitoring test system and test method for dynamic friction and wear corrosion in the real sea environment. However, real sea testing requires a lot of manpower, material and financial resources, and the actual marine environment is highly unpredictable and uncontrollable, such as weather changes, wave size, seawater temperature and other factors, which may affect the accuracy and consistency of the test results. In addition, real sea testing usually requires a long time period to fully expose the wear of the material in the marine environment, which may affect the research progress and test efficiency. Summary of the invention

[0004] The present invention aims to solve the deficiencies in the prior art and to provide a friction corrosion test system based on deep sea environment simulation, which can conduct friction corrosion test research while dynamically simulating the deep sea environment.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides a friction corrosion test system based on deep sea environment simulation, comprising a deep sea environment simulation subsystem and a friction corrosion test subsystem; The deep-sea environment simulation subsystem includes an air distribution unit, a liquid storage unit, a water chemistry monitoring unit, a low-temperature and high-pressure control unit, and a PC data processing and control unit; the air distribution unit is connected to the liquid storage unit, the water chemistry monitoring unit and the low-temperature and high-pressure control unit are respectively connected to the liquid storage unit through a pipeline loop, the liquid storage unit is used for preparing and storing simulated seawater, the air distribution unit injects oxygen and nitrogen in a suitable ratio into the liquid storage unit, the water chemistry monitoring unit is used for real-time monitoring of the water chemistry parameters of the simulated seawater in the liquid storage unit, the low-temperature and high-pressure control unit is used for real-time adjustment of the temperature and pressure of the simulated seawater flowing out of the liquid storage unit, and the PC data processing and control unit are respectively electrically connected to the air distribution unit, the water chemistry monitoring unit, and the low-temperature and high-pressure control unit; The friction corrosion test subsystem includes a friction corrosion test machine, which is connected to a low-temperature and high-pressure control unit through a pipeline, and the low-temperature and high-pressure control unit supplies simulated deep-sea water to the friction corrosion test machine.

[0006] Furthermore, the liquid storage unit includes a liquid storage tank, a liquid inlet pipe, a pressure gauge, and an exhaust pipe are arranged on the top of the liquid storage tank, a liquid discharge pipe is arranged at the bottom of the liquid storage tank, a first ball valve, a second ball valve, and a first safety valve are arranged on the liquid inlet pipe, the liquid discharge pipe, and the exhaust pipe, respectively, and upper and lower limit liquid level gauges are installed on the outside of the liquid storage tank.

[0007] Preferably, the top of the liquid storage tank is also connected to a gas distribution regulation indicating pipeline, on which a second check valve and a needle valve are arranged, and the liquid outlet end of the gas distribution regulation indicating pipeline extends into the water contained in the gas distribution regulation bubbling indicator.

[0008] Furthermore, the gas distribution unit includes a nitrogen pipeline and an oxygen pipeline. The air inlet end of the nitrogen pipeline is connected to the nitrogen cylinder, and the air inlet end of the oxygen pipeline is connected to the oxygen cylinder. The air outlet ends of the nitrogen pipeline and the oxygen pipeline are connected to the aeration pipe arranged in the lower part of the liquid storage tank after being connected in parallel; the nitrogen pipeline is provided with a first stop valve, a first pressure reducing valve, and a first solenoid valve, and the oxygen pipeline is provided with a second stop valve, a second pressure reducing valve, and a second solenoid valve. A first check valve is provided on the pipeline connecting the nitrogen pipeline and the oxygen pipeline.

[0009] Further, the water chemistry monitoring unit includes a water chemistry loop main pipe, the liquid inlet end of the water chemistry loop main pipe is connected to the bottom of the liquid storage tank, and the liquid outlet end is connected to the top of the liquid storage tank. The water chemistry loop main pipe is sequentially connected with a temperature regulating branch pipe, a dissolved oxygen detection branch pipe, a pH detection branch pipe, and a conductivity detection branch pipe, and the liquid outlet end of each branch pipe is connected to the upper part of the liquid storage tank. The water chemistry loop main pipe is sequentially provided with a third ball valve, a centrifugal mixing pump, a fourth ball valve, a sixth ball valve, a ninth ball valve, and an eleventh ball valve. The temperature regulating branch pipe is provided with a first flow meter and a first heat exchanger. The liquid inlet end of the temperature regulating branch pipe is located between the centrifugal mixing pump and the fourth ball valve. The second flowmeter, dissolved oxygen electrode and fifth ball valve are arranged on the dissolved oxygen detection branch pipe on the water chemical circuit main pipe section between the fourth ball valve and the sixth ball valve, the third flowmeter, pH electrode and seventh ball valve are arranged on the pH detection branch pipe, the fourth flowmeter, conductivity electrode and eighth ball valve are arranged on the conductivity detection branch pipe, the liquid inlet ends of the pH detection branch pipe and the conductivity detection branch pipe are both located on the water chemical circuit main pipe section between the sixth ball valve and the ninth ball valve, and the first flowmeter, the second flowmeter, the third flowmeter and the fourth flowmeter are all adjustable flowmeters.

[0010] Furthermore, the low-temperature and high-pressure control unit includes a low-temperature and high-pressure control loop pipeline, the liquid inlet end of the low-temperature and high-pressure control loop pipeline is connected to the bottom of the liquid storage tank, and the liquid outlet end is connected to the liquid inlet end of the eleventh ball valve, and the low-temperature and high-pressure control loop pipeline is sequentially provided with a tenth ball valve, a filter, a high-pressure diaphragm pump, a pressure buffer, a second heat exchanger, a first temperature sensor, a fifth stop valve, a third heat exchanger, a second temperature sensor, a back pressure regulator, and a fifth flow meter, a pressure transmitter is installed on the pressure buffer, a diaphragm fault alarm and a second pressure gauge are provided on the high-pressure diaphragm pump, and the second pressure gauge is a limit pressure gauge, and both ends of the fifth stop valve are connected in parallel with the friction corrosion test seawater delivery pipeline, a third stop valve and a fourth stop valve are provided on the friction corrosion test seawater delivery pipeline, and a friction corrosion testing machine is connected between the third stop valve and the fourth stop valve.

[0011] Preferably, a first external pipe is arranged on the low-temperature and high-pressure control loop pipeline between the high-pressure diaphragm pump and the pressure buffer, and a second safety valve is arranged on the first external pipe; a second external pipe is arranged on the low-temperature and high-pressure control loop pipeline between the back pressure regulator and the fifth flowmeter, and a third safety valve is arranged on the second external pipe.

[0012] Furthermore, the PC data processing and control unit includes an air distribution PID controller, a first temperature PID controller, a second temperature PID controller, and a PC. The air distribution PID controller, the first temperature PID controller, and the second temperature PID controller are all electrically connected to the PC. The air distribution PID controller is electrically connected to the first solenoid valve and the second solenoid valve, respectively. The first temperature PID controller is electrically connected to the first temperature sensor, the second temperature PID controller is electrically connected to the second temperature sensor, and the pressure transmitter is electrically connected to the PC.

[0013] Furthermore, the friction testing machine includes a kettle body, a kettle cover detachably connected to the top of the kettle body, a liquid injection pipe is arranged at the bottom of the kettle body, a liquid outlet pipe is arranged on the kettle cover, the inlet of the liquid injection pipe is connected to the water outlet end of the third stop valve, the outlet of the liquid outlet pipe is connected to the water inlet end of the fourth stop valve, a magnetic driver is installed in the middle of the top of the kettle cover, a stepper motor driver is installed in the middle of the bottom of the kettle body through a frame, a lower cavity frame and an upper cavity frame are arranged inside the kettle body, the upper cavity frame is fixed to the top wall of the kettle cover, the lower cavity frame is detachably connected to the upper cavity frame, a pin bracket is rotatably installed in the middle of the upper cavity frame, and a pin bracket is installed on the pin bracket A friction pin is installed, and the magnetic axis of the magnetic driver is coaxially connected to the central axis of the pin bracket through an elastic coupling. A bracket is installed in the middle of the lower cavity frame through a sliding bearing. An insulating pad is arranged on the disc-shaped top surface of the bracket, and a friction disk is arranged on the insulating pad. The central axis of the bracket is connected to the loading rod through a spring loader, and the lower end of the loading rod is connected to the output shaft of the stepper motor driver through a rotating coupling. When working, the magnetic driver drives the pin bracket to rotate, and the stepper motor driver drives the bracket to move vertically upward or downward to make the top surface of the friction disk contact or separate with the lower end of the friction pin.

[0014] Furthermore, a load sensor is installed on the output shaft of the stepper motor driver, and a torque sensor is installed on the loading rod.

[0015] Furthermore, the spring loader includes a pull rod coupling and a spring, the spring is sleeved on the upper part of the pull rod coupling, the upper end of the spring abuts against the bracket, the lower end of the spring abuts against the lower part of the pull rod coupling, the upper end of the pull rod coupling is slidably connected to the bracket, and the lower end of the pull rod coupling is connected to the loading rod.

[0016] Furthermore, a working electrode, an auxiliary electrode and a reference electrode are also provided in the kettle body. The working electrode is embedded in the upper surface of the friction disk and is located directly below the friction pin. The auxiliary electrode is located on the inner wall of the lower cavity frame. Two wires connected to the working electrode and the auxiliary electrode are respectively passed through two high-voltage wire pipes provided on the top of the kettle cover and passed out of the kettle cover to connect to the electrochemical workstation. The reference electrode is provided at the lower part of the kettle body (4902) and is connected to the electrochemical workstation through a wire.

[0017] Compared with the prior art, the beneficial technical effects of the present invention are: 1. The friction corrosion test system based on deep-sea environment simulation of the present invention can accurately and dynamically simulate the deep-sea high-pressure environment. The deep sea is an environment coupled with multiple environmental factors such as high pressure, corrosion, low temperature, and low oxygen. Existing deep-sea simulation equipment can only simulate seawater pressure in the form of air pressure or water pressure, but cannot regulate and monitor seawater indicators such as temperature, dissolved oxygen, pH, and conductivity. The deep-sea environment simulation system involved in the present invention can simulate the deep-sea environment from all aspects of seawater pressure, temperature, dissolved oxygen, pH, and conductivity, and realize high-fidelity simulation of the entire sea area and the entire sea depth.

[0018] 2. The friction corrosion test system based on deep-sea environment simulation of the present invention can perform in-situ friction, wear and corrosion electrochemical tests in a simulated deep-sea high-pressure environment. The key moving parts of deep-sea equipment serve directly in deep-sea high-pressure seawater, and the materials suffer serious corrosion-wear coupling damage. Therefore, evaluating the corrosion and wear performance of materials is crucial to the safety and reliability of deep-sea equipment. At present, the evaluation of the corrosion and wear performance of deep-sea environment materials is carried out in a normal-pressure seawater environment, but the deep sea is a harsh and complex environment different from the normal-pressure seawater environment. The different test environments may lead the relevant research astray due to the lack of credibility of the performance evaluation results of the materials. The friction corrosion test system based on deep-sea environment simulation involved in the present invention can perform in-situ friction, wear and corrosion electrochemical tests in a precisely simulated deep-sea environment, accurately reproducing the corrosion and wear conditions of the materials of the key moving parts of deep-sea equipment. The results obtained are highly credible and provide strong guidance for the material selection and protection of deep-sea equipment.

[0019] 3. A friction corrosion test system based on deep-sea environment simulation of the present invention can perform in-situ electrochemical testing while performing friction and wear, synchronously obtain tribological and electrochemical information, and conduct corrosion-wear interaction research in deep-sea environment. The key moving parts of deep-sea equipment are mainly damaged by corrosion-wear coupling directly in deep-sea high-pressure seawater, and the essence of the damage is the interaction between corrosion and wear. Therefore, evaluating the corrosion and wear interaction of deep-sea equipment materials in deep-sea high-pressure environment is of great value to scientific research and engineering applications. Usually, the evaluation of corrosion-wear interaction connects the friction pair as the working electrode to the electrochemical three-electrode system under normal pressure, and the relevant test methods are relatively mature. However, the evaluation of corrosion and wear interaction in deep-sea high-pressure environment is still a key technology that urgently needs to be broken through. The friction corrosion test system based on deep-sea environment simulation involved in the present invention can simultaneously carry out friction and wear and corrosion electrochemical tests in a precisely simulated deep-sea environment. Based on the friction and wear and corrosion electrochemical results, the quantitative analysis of corrosion-wear interaction can be achieved, which has significant innovation and advancement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a structural schematic diagram of a friction corrosion test system based on deep sea environment simulation of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the friction corrosion testing machine; Figure 3 To simulate the static and friction and wear polarization curves in seawater environment; Figure 4 To simulate the static and friction and wear polarization curves in a 1000-meter deep seawater environment; Figure 5 To simulate the static and friction and wear polarization curves in a 2000-meter deep seawater environment; Figure 6 To simulate the static and friction and wear polarization curves in a 3000m deep seawater environment; Figure numerals: 1-liquid storage tank, 2-nitrogen cylinder, 3-first stop valve, 4-first pressure reducing valve, 5-first solenoid valve, 6-oxygen cylinder, 7-second stop valve, 8-second pressure reducing valve, 9-second solenoid valve, 10-gas distribution PID controller, 11-first check valve, 12-aeration pipe, 13-first ball valve, 14-first pressure gauge, 15-first safety valve, 16-upper and lower limit liquid level gauge, 17-second ball valve, 18-second check valve, 19-needle valve, 20-gas distribution adjustment bubbling indicator, 21-third ball valve, 22-centrifugal mixing pump, 23-fourth ball valve , 24-first flow meter, 25-first heat exchanger, 26-second flow meter, 27-dissolved oxygen electrode, 28-fifth ball valve, 29-sixth ball valve, 30-third flow meter, 31-pH electrode, 32-seventh ball valve, 33-fourth flow meter, 34-conductivity electrode, 35-eighth ball valve, 36-ninth ball valve, 37-tenth ball valve, 38-filter, 39-high pressure diaphragm pump, 40-diaphragm fault alarm, 41-second pressure gauge, 42-second safety valve, 43-pressure buffer, 44-pressure transmitter, 45-second heat exchanger, 46-first a temperature sensor, 47-a first temperature PID controller, 48-a third stop valve, 49-a friction corrosion tester, 4901-a kettle cover, 4902-a kettle body, 4903-a liquid injection pipe, 4904-a liquid outlet pipe, 4905-a magnetic driver, 4906-an elastic coupling, 4907-a pin bracket, 4908-a lower cavity frame, 4909-an upper cavity frame, 4910-a friction pin, 4911-a frame, 4912-a stepper motor driver, 4913-a load sensor, 4914-a rotary coupling, 4915-a loading rod, 4916-a torque sensor Sensor, 4917-tie rod coupling, 4918-spring, 4919-bracket, 4920-sliding bearing, 4921-insulating pad, 4922-friction disc, 4923-working electrode, 4924-auxiliary electrode, 4925-reference electrode, 4926-wire, 4927-high-pressure threading pipe, 50-fourth stop valve, 51-fifth stop valve, 52-third heat exchanger, 53-second temperature sensor, 54-second temperature PID controller, 55-back pressure regulator, 56-fifth flow meter, 57-eleventh ball valve, 58-third safety valve. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely in conjunction with the embodiments below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1 Please refer to the attached Figure 1and 2 As shown, this embodiment provides a friction corrosion test system based on deep sea environment simulation, including a deep sea environment simulation subsystem and a friction corrosion test subsystem.

[0023] The deep-sea environment simulation subsystem includes an air distribution unit, a liquid storage unit, a water chemistry monitoring unit, a low-temperature and high-pressure control unit, and a PC data processing and control unit; the air distribution unit is connected to the liquid storage unit, and the water chemistry monitoring unit and the low-temperature and high-pressure control unit are respectively connected to the liquid storage unit through a pipeline loop, the liquid storage unit is used to simulate the preparation and storage of seawater, the air distribution unit injects oxygen and nitrogen in a suitable ratio into the liquid storage unit, the water chemistry monitoring unit is used to monitor the water chemistry parameters of the simulated seawater in the liquid storage unit in real time, the low-temperature and high-pressure control unit is used to adjust the temperature and pressure of the simulated seawater flowing out of the liquid storage unit in real time, and the PC data processing and control unit are respectively electrically connected to the air distribution unit, the water chemistry monitoring unit, and the low-temperature and high-pressure control unit; the friction corrosion test subsystem includes a friction corrosion testing machine 49, the friction corrosion testing machine 49 is connected to the low-temperature and high-pressure control unit through a pipeline, and the low-temperature and high-pressure control unit supplies simulated deep-sea seawater to the friction corrosion testing machine 49.

[0024] The liquid storage unit of the deep-sea environment simulation subsystem includes a liquid storage tank 1, a liquid inlet pipe, a pressure gauge, and an exhaust pipe are arranged on the top of the liquid storage tank 1, a liquid discharge pipe is arranged at the bottom of the liquid storage tank 1, a first ball valve 13, a second ball valve 17, and a first safety valve 15 are arranged on the liquid inlet pipe, the liquid discharge pipe, and the exhaust pipe, respectively, and an upper and lower limit liquid level gauge 16 is installed on the outer side of the liquid storage tank 1; the top of the liquid storage tank 1 is also connected to a gas distribution adjustment indicating pipeline, a second check valve 18 and a needle valve 19 are arranged on the gas distribution adjustment indicating pipeline, and the liquid outlet end of the gas distribution adjustment indicating pipeline extends into the water contained in the gas distribution adjustment bubble indicator 20.

[0025] Specifically, the gas distribution unit includes a nitrogen pipeline and an oxygen pipeline. The air inlet end of the nitrogen pipeline is connected to the nitrogen cylinder 2, and the air inlet end of the oxygen pipeline is connected to the oxygen cylinder 6. The air outlet ends of the nitrogen pipeline and the oxygen pipeline are connected to the aeration pipe 12 arranged in the lower part of the liquid storage tank 1 after being connected in parallel; the nitrogen pipeline is provided with a first stop valve 3, a first pressure reducing valve 4, and a first solenoid valve 5, and the oxygen pipeline is provided with a second stop valve 7, a second pressure reducing valve 8, and a second solenoid valve 9. A first check valve 11 is provided on the pipeline connecting the nitrogen pipeline and the oxygen pipeline.

[0026] The water chemistry monitoring unit of the deep-sea environment simulation subsystem includes a water chemistry loop main pipe, the liquid inlet end of the water chemistry loop main pipe is connected to the bottom of the liquid storage tank 1, and the liquid outlet end thereof is connected to the top of the liquid storage tank 1. The water chemistry loop main pipe is sequentially connected in parallel with a temperature regulating branch pipe, a dissolved oxygen detection branch pipe, a pH detection branch pipe, and a conductivity detection branch pipe, and the liquid outlet end of each branch pipe is connected to the upper part of the liquid storage tank 1. The third ball valve 21, the centrifugal mixing pump 22, the fourth ball valve 23, the sixth ball valve 29, the ninth ball valve 36, and the eleventh ball valve 57 are sequentially arranged on the water chemistry loop main pipe, the first flow meter 24 and the first heat exchanger 25 are arranged on the temperature regulating branch pipe, and the liquid inlet end of the temperature regulating branch pipe is located between the centrifugal mixing pump 22 and the fourth ball valve 23. The dissolved oxygen detection branch pipe is provided with a second flowmeter 26, a dissolved oxygen electrode 27 and a fifth ball valve 28. The liquid inlet end of the dissolved oxygen detection branch pipe is located on the water chemical circuit main pipe section between the fourth ball valve 23 and the sixth ball valve 29. The pH detection branch pipe is provided with a third flowmeter 30, a pH electrode 31 and a seventh ball valve 32. The conductivity detection branch pipe is provided with a fourth flowmeter 33, a conductivity electrode 34 and an eighth ball valve 35. The liquid inlets of the pH detection branch pipe and the conductivity detection branch pipe are both located on the water chemical circuit main pipe section between the sixth ball valve 29 and the ninth ball valve 36. The first flowmeter 24, the second flowmeter 26, the third flowmeter 30 and the fourth flowmeter 33 are all adjustable flowmeters.

[0027] The low-temperature and high-pressure control unit includes a low-temperature and high-pressure control loop pipeline. The liquid inlet end of the low-temperature and high-pressure control loop pipeline is connected to the bottom of the liquid storage tank 1, and the liquid outlet end is connected to the liquid inlet end of the eleventh ball valve 57. The seawater medium flows back to the liquid storage tank 1 after passing through the eleventh ball valve 57. The tenth ball valve 37, the filter 38, the high-pressure diaphragm pump 39, the pressure buffer 43, the second heat exchanger 45, the first temperature sensor 46, the fifth stop valve 51, the third heat exchanger 52, the second temperature sensor 53, the back pressure regulator 55, and the fifth flow meter 56 are sequentially arranged along the water flow direction of the low-temperature and high-pressure control loop pipeline. The pressure transmitter 44 is installed on the pressure buffer 43. The high-pressure diaphragm pump 39 is provided with a diaphragm failure alarm 40 and a second pressure gauge 41. The second pressure gauge 41 is a pressure gauge with a limit position. The fifth stop valve 51 is connected in parallel at both ends to prevent friction corrosion. Test seawater delivery pipeline, friction corrosion test: a third stop valve 48 is set on the water inlet section of the seawater delivery pipeline, and a fourth stop valve 50 is set on the return water section, and a friction corrosion testing machine 49 is connected between the third stop valve 48 and the fourth stop valve 50; a first external pipe is set on the low-temperature and high-pressure control loop pipeline between the high-pressure diaphragm pump 39 and the pressure buffer 43, and a second safety valve 42 is set on the first external pipe; a second external pipe is set on the low-temperature and high-pressure control loop pipeline between the back pressure regulator 55 and the fifth flowmeter 56, and a third safety valve 58 is set on the second external pipe.

[0028] Specifically, the PC data processing and control unit includes a gas distribution PID controller 10, a first temperature PID controller 47, a second temperature PID controller 54, and a PC. The gas distribution PID controller 10, the first temperature PID controller 47, and the second temperature PID controller 54 are all electrically connected to the PC. The gas distribution PID controller 10 is electrically connected to the first solenoid valve 5 and the second solenoid valve 9 respectively. The first temperature PID controller 47 is used to control the supply of oxygen and nitrogen; the first temperature PID controller 47 is electrically connected to the first temperature sensor 46, the second temperature PID controller 54 is electrically connected to the second temperature sensor 53, and the pressure transmitter 44 is electrically connected to the PC.

[0029] like Figure 2 As shown, the friction testing machine includes a kettle body 4902, a kettle cover 4901 detachably connected to the top of the kettle body 4902, an injection pipe 4903 is arranged at the bottom of the kettle body 4902, and a liquid outlet pipe 4904 is arranged on the kettle cover 4901. The inlet of the injection pipe 4903 is connected to the water outlet end of the third stop valve 48, and the outlet of the liquid outlet pipe 4904 is connected to the water inlet end of the fourth stop valve 50. A magnetic driver 4905 is installed in the middle of the top of the kettle cover 4901, and a stepper motor driver 4912 is installed in the middle of the bottom of the kettle body 4902 through a frame 4911. A lower cavity frame 4908 and an upper cavity frame 4909 are arranged inside the kettle body 4902. The upper cavity frame 4909 is fixed on the top wall of the kettle cover 4901. The lower cavity frame 4908 is detachably connected to the bottom of the upper cavity frame 4909. A pin bracket 4907 is rotatably installed in the middle of the upper cavity frame 4909. A friction pin 4910 is installed on the pin bracket 4907. The magnetic axis of the magnetic drive 4905 is coaxially connected with the central axis of the pin bracket 4907 through an elastic coupling 4906. A bracket 4919 is installed in the middle of the lower cavity frame 4908 through a sliding bearing 4920. The disc-shaped top surface of the bracket 4919 An insulating pad 4921 is provided, and a friction disk 4922 is provided on the insulating pad 4921. The central axis of the bracket 4919 is connected to the loading rod 4915 through the spring 4918 loader. The lower end of the loading rod 4915 is connected to the output shaft of the stepper motor driver 4912 through the rotating coupling 4914. During operation, the magnetic driver 4905 drives the pin bracket 4907 to rotate, and the stepper motor driver 4912 drives the bracket 4919 to move vertically upward or downward to make the top surface of the friction disk 4922 contact or separate with the lower end of the friction pin 4910, and a friction test is carried out during the contact process.

[0030] The spring loader includes a pull rod coupling 4917 and a spring 4918. The spring 4918 is sleeved on the upper part of the pull rod coupling 4917. The upper end of the spring 4918 abuts against the bracket 4919, and the lower end of the spring 4918 abuts against the lower part of the pull rod coupling 4917. The upper end of the pull rod coupling 4917 is slidably connected to the bracket 4919, and the lower end of the pull rod coupling 4917 is connected to the loading rod 4915.

[0031] A working electrode 4923, an auxiliary electrode 4924, and a reference electrode 4925 are also provided in the kettle body 4902. The working electrode 4923 is embedded in the upper surface of the friction disk 4922 and is located directly below the friction pin 4910. The auxiliary electrode 4924 is located on the inner wall of the lower cavity frame 4908. Two wires 4926 connected to the working electrode 4923 and the auxiliary electrode 4924 respectively pass through two high-voltage threading tubes 4927 provided on the top of the kettle cover 4901 and pass out of the kettle cover 4901 to connect to the electrochemical workstation. The reference electrode 4925 is provided at the lower part of the kettle body 4902 and is connected to the electrochemical workstation through a wire. The wire 4926 in this embodiment is a nickel-plated copper core polytetrafluoroethylene insulated wire.

[0032] A working method of a friction corrosion test system based on deep sea environment simulation of the present invention comprises: (1) Open the first ball valve 13, keep the second ball valve 17, the third ball valve 21, and the tenth ball valve 37 closed, and send the seawater sampled from the outside or the configured simulated seawater into the liquid storage tank 1 through the liquid inlet pipe. When the liquid storage tank 1 reaches the rated capacity, close the first ball valve 13, and inject nitrogen and oxygen into the liquid storage tank 1 through the nitrogen cylinder 2 and the oxygen cylinder 6. During the nitrogen and oxygen injection process, the gas distribution PID controller 10 is used to control the first solenoid valve 5 and the second solenoid valve 9 to adjust the nitrogen-oxygen ratio in the liquid storage tank 1, and observe the bubbling speed of the gas distribution adjustment bubbling indicator 20, the liquid levels of the upper and lower limit liquid level gauges 16, and the pressure value of the first pressure gauge 14; (2) Open the third ball valve 21, and send the simulated seawater in the liquid storage tank 1 into the temperature adjustment branch, dissolved oxygen detection branch, pH detection branch, and conductivity detection branch through the centrifugal mixing pump 22. The dissolved oxygen rate, pH value, and conductivity of the simulated seawater in the liquid storage tank 1 are detected by the dissolved oxygen electrode 27, the pH electrode 31, and the conductivity electrode 34. The temperature of the simulated seawater in the liquid storage tank 1 is adjusted by the first heat exchanger 25. When the various parameters are adjusted to the required values, the deep seawater simulation is completed.

[0033] (3) Open the tenth ball valve 37 and the fifth stop valve 51, keep the third stop valve 48 and the fourth stop valve 50 closed, and send the simulated seawater whose dissolved oxygen content, pH value and conductivity meet the test requirements into the low-temperature and high-pressure control loop pipeline through the high-pressure diaphragm pump 39. Adjust the pressure and temperature of the simulated seawater entering the low-temperature and high-pressure control loop pipeline through the pressure buffer 43, the second heat exchanger 45 and the third heat exchanger 52. When the pressure and temperature values ​​meet the test requirements of the friction corrosion tester 49, open the third stop valve 48 and the fourth stop valve 50, and close the fifth stop valve 51. Send the simulated seawater that meets the test requirements into the friction corrosion tester 49. The simulated seawater flowing out of the friction corrosion tester 49 is adjusted in temperature through the third heat exchanger 52 and flows back into the liquid storage tank 1.

[0034] (4) The magnetic driver 4905 is started to drive the pin bracket 4907 on which the friction pin 4910 is installed to rotate, and the stepper motor driver 4912 is started to drive the loading rod 4915 and the pull rod coupling 4917 to rise so that the working electrode 4923 on the friction disk 4922 contacts the friction pin 4910, and the friction pin 4910 performs a circular friction motion on the friction disk 4922.

[0035] (5) After the friction and wear test is completed, the stepper motor driver 4912 is controlled to drive the loading rod 4915 and the pull rod coupling 4917 to descend so that the friction disk 4922 is separated from the friction pin 4910 to the initial position, the magnetic driver 4905, the tenth ball valve 37, and the third ball valve 21 are closed, and the second ball valve 17 is opened to discharge the seawater in the liquid storage tank 1.

[0036] The deep-sea environment simulation subsystem of the present invention can dynamically simulate the deep-sea environment of the entire sea depth, and the friction corrosion test subsystem can synchronously obtain tribological (wear rate, friction coefficient) and electrochemical information (corrosion current, corrosion potential).

[0037] ① Wear rate w The calculation method is as follows: w = (M0-M1) / ρdL (1) Where w is the wear rate (mm 3 / Nm), M0 is the mass of the sample before wear (g), M1 is the mass of the sample after wear (g), ρ is the material density, d is the sliding distance, and L is the load.

[0038] ② Friction coefficient μ The calculation method is as follows: μ = A / Fd (2) in, μ is the friction coefficient, A is the torque (Nm), F is the normal load (N), and d is the friction radius (m).

[0039] ③ The calculation method of friction dynamic corrosion rate i is as follows: η = a + b × lg|i| (3) in, η is the overpotential (mV), a and b are constants, and i is the current density (A / cm 2 The corrosion potential is determined based on the intersection of the cathode branch and the anode branch of the in-situ polarization curve of friction and wear, and the corrosion current density is determined based on formula (3).

[0040] Test Case The present invention uses the system and working method of the embodiment to dynamically simulate the deep sea environment at sea surface, 1000 meters deep, 2000 meters deep and 3000 meters deep, and simultaneously conducts friction corrosion and in-situ electrochemical tests. The static and friction wear polarization curves obtained in different deep sea water environments are as follows: Figure 3-6 shown.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the technical solution and conceptual invention of the present invention should be included in the protection scope of the present invention.

Claims

1. A friction corrosion test system based on deep sea environment simulation, characterized by: Including deep sea environment simulation subsystem and friction corrosion test subsystem; The deep-sea environment simulation subsystem includes an air distribution unit, a liquid storage unit, a water chemistry monitoring unit, a low-temperature and high-pressure control unit, and a PC data processing and control unit; the air distribution unit is connected to the liquid storage unit, the water chemistry monitoring unit and the low-temperature and high-pressure control unit are respectively connected to the liquid storage unit through a pipeline loop, the liquid storage unit is used to simulate the preparation and storage of seawater, the air distribution unit injects oxygen and nitrogen in the required ratio into the liquid storage unit, the water chemistry monitoring unit is used to monitor the water chemistry parameters of the simulated seawater in the liquid storage unit in real time, the low-temperature and high-pressure control unit is used to adjust the temperature and pressure of the simulated seawater flowing out of the liquid storage unit in real time, the PC data processing and control unit is respectively electrically connected to the air distribution unit, the water chemistry monitoring unit, and the low-temperature and high-pressure control unit, and the PC data processing and control unit is used to adjust the air distribution amount, water temperature and water pressure of oxygen and nitrogen; The friction corrosion test subsystem comprises a friction corrosion test machine (49), which is connected to a low-temperature and high-pressure control unit via a pipeline, and the low-temperature and high-pressure control unit supplies simulated deep-sea water to the friction corrosion test machine (49).

2. A friction corrosion test system based on deep sea environment simulation according to claim 1, characterized in that: The liquid storage unit comprises a liquid storage tank (1), wherein a liquid inlet pipe, a pressure gauge and an exhaust pipe are arranged at the top of the liquid storage tank (1), a liquid discharge pipe is arranged at the bottom of the liquid storage tank (1), a first ball valve (13), a second ball valve (17) and a first safety valve (15) are arranged on the liquid inlet pipe, the liquid discharge pipe and the exhaust pipe respectively, and an upper and lower limit liquid level gauge (16) is installed on the outer side of the liquid storage tank (1); the top of the liquid storage tank (1) is also connected to a gas distribution regulation indicating pipeline, a second check valve (18) and a needle valve (19) are arranged on the gas distribution regulation indicating pipeline, and a liquid outlet end of the gas distribution regulation indicating pipeline extends into water contained in a gas distribution regulation bubble indicator (20).

3. A friction corrosion test system based on deep sea environment simulation according to claim 2, characterized in that: The gas distribution unit comprises a nitrogen pipeline and an oxygen pipeline. The nitrogen pipeline has an air inlet connected to a nitrogen cylinder (2), the oxygen pipeline has an air inlet connected to an oxygen cylinder (6), and the nitrogen pipeline and the oxygen pipeline have air outlets that are connected in parallel to an aeration pipe (12) disposed in the lower part of a liquid storage tank (1). The nitrogen pipeline is provided with a first stop valve (3), a first pressure reducing valve (4), and a first solenoid valve (5), the oxygen pipeline is provided with a second stop valve (7), a second pressure reducing valve (8), and a second solenoid valve (9), and a first check valve (11) is provided on the pipeline where the nitrogen pipeline and the oxygen pipeline are parallel.

4. A friction corrosion test system based on deep sea environment simulation according to claim 3, characterized in that: The water chemistry monitoring unit comprises a water chemistry loop main pipe, the liquid inlet end of the water chemistry loop main pipe is connected to the bottom of the liquid storage tank (1), and the liquid outlet end thereof is connected to the top of the liquid storage tank (1). The water chemistry loop main pipe is connected in sequence to a temperature regulating branch pipe, a dissolved oxygen detection branch pipe, a pH detection branch pipe, and a conductivity detection branch pipe, and the liquid outlet end of each branch pipe is connected to the top of the liquid storage tank (1). The water chemistry loop main pipe is provided with a third ball valve (21), a centrifugal mixing pump (22), a fourth ball valve (23), a sixth ball valve (29), a ninth ball valve (36), and an eleventh ball valve (57) in sequence. The temperature regulating branch pipe is provided with a first flow meter (24) and a first heat exchanger (25). The liquid inlet end of the temperature regulating branch pipe is located on the water chemistry loop main pipe between the centrifugal mixing pump (22) and the fourth ball valve (23). The invention relates to a water chemistry circuit main pipe section, wherein a second flow meter (26), a dissolved oxygen electrode (27) and a fifth ball valve (28) are arranged on the dissolved oxygen detection branch pipe; the liquid inlet end of the dissolved oxygen detection branch pipe is located on the water chemistry circuit main pipe section between the fourth ball valve (23) and the sixth ball valve (29); the pH detection branch pipe is provided with a third flow meter (30), a pH electrode (31) and a seventh ball valve (32); the conductivity detection branch pipe is provided with a fourth flow meter (33), a conductivity electrode (34) and an eighth ball valve (35); the liquid inlet ends of the pH detection branch pipe and the conductivity detection branch pipe are both located on the water chemistry circuit main pipe section between the sixth ball valve (29) and the ninth ball valve (36); the first flow meter (24), the second flow meter (26), the third flow meter (30) and the fourth flow meter (33) are all adjustable flow meters.

5. A friction corrosion test system based on deep sea environment simulation according to claim 4, characterized in that: The low-temperature and high-pressure control unit comprises a low-temperature and high-pressure control loop pipeline, wherein the liquid inlet end of the low-temperature and high-pressure control loop pipeline is connected to the bottom of the liquid storage tank (1), and the liquid outlet end thereof is connected to the liquid inlet end of the eleventh ball valve (57). The low-temperature and high-pressure control loop pipeline is provided with a tenth ball valve (37), a filter (38), a high-pressure diaphragm pump (39), a pressure buffer (43), a second heat exchanger (45), a first temperature sensor (46), a fifth stop valve (51), a third heat exchanger (52), a second temperature sensor (53), a back pressure regulator (55), and a fifth flow meter (56) in sequence. A pressure transmitter (44) is installed on the pressure buffer (43). The high-pressure diaphragm pump (39) is provided with a diaphragm failure alarm (40). A second pressure gauge (41), the second pressure gauge (41) is a pressure gauge with a limit position, the two ends of the fifth stop valve (51) are connected in parallel to the friction corrosion test seawater delivery pipeline, a third stop valve (48) and a fourth stop valve (50) are arranged on the friction corrosion test seawater delivery pipeline, and a friction corrosion test machine (49) is connected between the third stop valve (48) and the fourth stop valve (50); a first external discharge pipe is arranged on the low-temperature and high-pressure control loop pipeline between the high-pressure diaphragm pump (39) and the pressure buffer (43), and a second safety valve (42) is arranged on the first external discharge pipe; a second external discharge pipe is arranged on the low-temperature and high-pressure control loop pipeline between the back pressure regulator (55) and the fifth flow meter (56), and a third safety valve (58) is arranged on the second external discharge pipe.

6. A friction corrosion test system based on deep sea environment simulation according to claim 5, characterized in that: The PC data processing and control unit comprises an air distribution PID controller (10), a first temperature PID controller (47), a second temperature PID controller (54), and a PC. The air distribution PID controller (10), the first temperature PID controller (47), and the second temperature PID controller (54) are all electrically connected to the PC. The air distribution PID controller (10) is electrically connected to the first solenoid valve (5) and the second solenoid valve (9), respectively. The first temperature PID controller (47) is electrically connected to the first temperature sensor (46). The second temperature PID controller (54) is electrically connected to the second temperature sensor (53). The pressure transmitter (44) is electrically connected to the PC.

7. A friction corrosion test system based on deep sea environment simulation according to claim 6, characterized in that: The friction testing machine comprises a kettle body (4902), a kettle cover (4901) detachably connected to the top of the kettle body (4902), a liquid injection pipe (4903) is arranged at the bottom of the kettle body (4902), a liquid outlet pipe (4904) is arranged on the kettle cover (4901), the inlet of the liquid injection pipe (4903) is connected to the water outlet end of the third stop valve (48), the outlet of the liquid outlet pipe (4904) is connected to the water inlet end of the fourth stop valve (50), and a magnetic drive is installed in the middle of the top of the kettle cover (4901). The stepper motor driver (4912) is installed in the middle of the bottom of the kettle body (4902) through a frame (4911), a lower cavity frame (4908) and an upper cavity frame (4909) are arranged inside the kettle body (4902), the upper cavity frame (4909) is fixed on the top wall of the kettle cover (4901), the lower cavity frame (4908) and the upper cavity frame (4909) are detachably connected, and a pin bracket (4907) is rotatably installed in the middle of the upper cavity frame (4909), and the pin bracket (4907) is fixed on the top wall of the kettle cover (4901). 7), a friction pin (4910) is installed on the magnetic drive (4905), the magnetic axis of the magnetic drive (4905) is coaxially connected to the central axis of the pin bracket (4907) through an elastic coupling (4906), a bracket (4919) is installed in the middle of the lower cavity frame (4908) through a sliding bearing (4920), an insulating pad (4921) is arranged on the disc-shaped top surface of the bracket (4919), a friction disk (4922) is arranged on the insulating pad (4921), and the central axis of the bracket (4919) is connected through an elastic coupling (4906). The spring (4918) loader is connected to the loading rod (4915), and the lower end of the loading rod (4915) is connected to the output shaft of the stepper motor driver (4912) through a rotating coupling (4914). When working, the magnetic driver (4905) drives the pin bracket (4907) to rotate, and the stepper motor driver (4912) drives the bracket (4919) to move vertically upward or downward to make the top surface of the friction disk (4922) contact or separate with the lower end of the friction pin (4910).

8. The friction corrosion test system based on deep sea environment simulation according to claim 7 is characterized in that: The spring (4918) loader includes a pull rod coupling (4917) and a spring (4918). The spring (4918) is sleeved on the upper part of the pull rod coupling (4917). The upper end of the spring (4918) abuts against the bracket (4919), and the lower end of the spring (4918) abuts against the lower part of the pull rod coupling (4917). The upper end of the pull rod coupling (4917) is slidably connected to the bracket (4919), and the lower end of the pull rod coupling (4917) is connected to the loading rod (4915).

9. The friction corrosion test system based on deep sea environment simulation according to claim 7, characterized in that: The kettle body (4902) is further provided with a working electrode (4923), an auxiliary electrode (4924), and a reference electrode (4925). The working electrode (4923) is embedded in the upper surface of the friction disk (4922) and is located directly below the friction pin (4910). The auxiliary electrode (4924) is located on the inner wall of the lower cavity frame (4908). Two wires (4926) respectively connected to the working electrode (4923) and the auxiliary electrode (4924) pass through two high-voltage threading tubes (4927) provided on the top of the kettle cover (4901) and pass out of the kettle cover (4901) to connect to the electrochemical workstation. The reference electrode (4925) is provided at the lower part of the kettle body (4902), and the reference electrode (4925) is connected to the electrochemical workstation through a wire.

Images