High / low temperature wear-corrosion coupling damage test device and quantitative evaluation method

Abstract

The invention relates to a high / low temperature wear-corrosion coupling damage test device and a quantitative evaluation method, and belongs to the technical field of wear corrosion test and material failure analysis. The device comprises a temperature-controllable corrosion test tank, a friction-wear test machine, an electrochemical workstation and a high-low temperature external circulation temperature controller, the temperature-controllable corrosion test tank is arranged on the friction-wear test machine, and friction-wear performance testing is achieved through reciprocating motion of the friction-wear test machine. And the temperature-controllable corrosion test tank is externally connected with an electrochemical workstation and a high-low temperature external circulation temperature controller and is used for testing corrosion performance and controlling temperature. According to the invention, high-precision testing and quantitative analysis of abrasion and corrosion of the metal-based material in high and low temperature environments are realized.

Description

Technical Field

[0001] The invention relates to a high / low temperature wear-corrosion coupling damage test device and a quantitative evaluation method, belonging to the technical field of wear corrosion testing technology and material failure analysis. Background Art

[0002] With global warming and the increasing depletion of terrestrial resources, the exploration and development of the deep sea and polar regions are attracting increasing attention. These environments are complex and dynamic, with vast temperature variations across different sea areas, ranging from temperatures exceeding 30°C in tropical waters to extreme temperatures reaching -70°C in the Arctic and Antarctic. High temperatures typically accelerate the rate of corrosion and wear, while the ductile-brittle transition of materials at low temperatures poses significant safety risks. During prolonged drilling and icebreaking operations, frictional heat builds up in offshore equipment, rapidly heating critical components and increasing the risk of wear failure of metal-based materials. Therefore, temperature variations introduce uncertainty into the evaluation of wear-corrosion coupled damage in metallic materials used in offshore equipment. A test device capable of precisely controlling high and low temperature wear-corrosion coupled damage and a rational quantitative evaluation method are urgently needed.

[0003] Currently, the development of wear-corrosion coupled damage testing equipment has gradually matured and diversified, and there are many reasonable quantitative evaluation models. However, temperature, a key factor affecting equipment service performance and the progression of wear and corrosion, is rarely reflected as an important variable.

[0004] Chinese patent document CN118067604A discloses a fretting-sliding composite corrosion and wear test device with controllable medium concentration and temperature. Using a supply tank, inlet and outlet pumps, a heating rod, and a temperature sensor, the temperature and concentration of the medium in the corrosion tank are maintained stable, simulating the effects of medium concentration and temperature on fretting-sliding corrosion and wear under actual working conditions. However, due to the high-to-low heat transfer pattern, the heating rod has difficulty maintaining a consistent temperature throughout the corrosion tank. Furthermore, the device can only achieve high-temperature control and cannot simulate low-temperature environments. Furthermore, the device does not mention a quantitative evaluation method for the effects of temperature, corrosion, and wear on material damage. Chinese patent document CN117664774A discloses a testing device and quantitative evaluation method for a coupled stress-wear-corrosion environment. This method establishes a wear, stress, and corrosion coupled test process, allowing for the study of the service behavior of various metal materials and metal-based composite materials under conditions closer to actual service conditions. Key behavioral data under multi-factor coupling can be obtained, allowing for quantitative analysis of wear, corrosion, wear-corrosion interaction, stress-wear interaction, and stress-corrosion interaction. However, the patent does not consider the effects of temperature on material corrosion and wear behavior.

[0005] The above methods all achieve two or three coupled damage evaluations between temperature, wear, corrosion and other factors through different forms of test devices. However, there is still a lack of methods for the wear-corrosion coupled damage test process in high / low temperature environments and for quantitative evaluation. For this reason, the present invention is proposed. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the present invention provides a high / low temperature wear-corrosion coupled damage testing device to achieve high-precision testing and quantitative analysis of wear and corrosion of metal-based materials in high and low temperature environments.

[0007] The present invention also provides a quantitative evaluation method for the high / low temperature wear-corrosion coupling damage testing device.

[0008] The technical solutions of the present invention are as follows:

[0009] A high / low temperature wear-corrosion coupled damage testing device includes a temperature-controllable corrosion test tank, a friction and wear testing machine, an electrochemical workstation and a high and low temperature external circulation temperature controller. The temperature-controllable corrosion test tank is provided on the friction and wear testing machine, and the friction and wear performance test is achieved through the reciprocating motion of the friction and wear testing machine. The temperature-controllable corrosion test tank is externally connected to the electrochemical workstation and the high and low temperature external circulation temperature controller for corrosion performance testing and temperature control.

[0010] Preferably, according to the present invention, the temperature-controlled corrosion test tank includes a connecting plate, an inner cavity wall and an outer cavity wall. The bottom of the connecting plate is arranged on the friction and wear testing machine. A rectangular outer cavity wall is sealed on the connecting plate. The inner cavity wall is arranged on the connecting plate inside the outer cavity wall. The inner cavity wall is a hollow rectangular parallelepiped with an open top. The cavity between the outer cavity wall and the inner cavity wall is a temperature-controlled liquid circulation cavity. An outer cover plate is arranged on the temperature-controlled liquid circulation cavity. The cavity inside the inner cavity wall is a corrosive medium placement cavity. An inner cover plate is arranged on the corrosive medium placement cavity. An opening for injecting corrosive liquid is arranged in the middle of the inner cover plate. A reference electrode and a counter electrode are fixed to one side of the inner cover plate through a fixing block. The reference electrode and the counter electrode are connected to an electrochemical workstation. The temperature-controlled liquid circulation cavity is connected to a high and low temperature external circulation temperature control machine through a water inlet and a water outlet arranged on the outer cavity wall.

[0011] Preferably, according to the present invention, locking sliders are symmetrically arranged at the bottom of the corrosive medium placement chamber, insulating screws are arranged on the locking sliders, and a plurality of screw holes are arranged at the bottom of the corrosive medium placement chamber. The locking sliders are used to clamp the sample, and the clamping distance of the sample is adjusted by adjusting the fixed position of the insulating screws to meet the clamping requirements of samples of different sizes.

[0012] Preferably, according to the present invention, a circulating liquid is provided in the temperature-controlled liquid circulation chamber, and the circulating liquid is water or anhydrous ethanol. At high temperature (temperature greater than 30°C), water is used as the circulating liquid, at low temperature (temperature less than 0°C), anhydrous ethanol is used as the circulating liquid, and at medium temperature (temperature between 0°C and 30°C), water or anhydrous ethanol can be selected.

[0013] According to the preferred embodiment of the present invention, the connecting plate is an insulating plate, a sealing ring A is provided at the connection between the outer cover plate and the temperature-controlled liquid circulation chamber, and a sealing ring B is provided at the connection between the inner cover plate and the corrosive medium placement chamber.

[0014] Preferably, according to the present invention, the water inlet is located lower than the water outlet to ensure that the circulating liquid fills the entire cavity.

[0015] Preferably, according to the present invention, both the reference electrode and the counter electrode are solid electrodes to eliminate the potential fluctuations on the liquid electrodes caused by high and low temperature environments.

[0016] Preferably, according to the present invention, the sample is a metal-based material with good conductivity. The back of the sample test surface is connected to a copper wire using conductive tape, and the other end of the copper wire is connected to an electrochemical workstation. The back of the sample test surface is cold-mounted using epoxy resin, exposing only the test surface, and the copper wire is led out from the side.

[0017] Preferably, according to the present invention, the high and low temperature external circulation temperature controller is used to achieve accurate temperature control of ±0.1°C within the range of -80 to 100°C.

[0018] The quantitative evaluation method of the high / low temperature wear-corrosion coupled damage test device is as follows:

[0019] (1) After cold mounting, place the sample in the corrosive medium placement chamber, adjust the locking slider to fix the sample, insert the reference electrode and the counter electrode into the fixing block, inject the corrosive solution so that the corrosive solution covers the sample and the reference electrode and the counter electrode penetrate, and then connect the sample, reference electrode and counter electrode to the electrochemical workstation to form a three-electrode circuit;

[0020] (2) Insert the indenter of the friction and wear testing machine into the corrosive medium placement chamber and adjust it to the initial position of the friction and wear test;

[0021] (3) Turn on the high and low temperature external circulation temperature controller, set the required test temperature, test the liquid temperature in each area of the corrosion chamber to be consistent with the set temperature, and then start the friction and wear testing machine and electrochemical workstation at the same time to conduct the wear-corrosion coupling damage test.

[0022] According to the present invention, further preferably, in step (3), a curve of wear-corrosion mass loss rate versus temperature is drawn through a wear-corrosion coupled damage test, comprising:

[0023] (31) Conduct potentiodynamic polarization test to determine the corrosion potential E at different temperatures corr (V), according to different materials and test requirements, in E corr The above anodic corrosion section selects a certain potential as E at each temperature. a,T (V);

[0024] (32) Select different wear positive pressure F according to different materials and test requirements n (N), wear reciprocating distance d (m), wear frequency f (Hz) and wear time t (s) to ensure that the wear volume loss V (mm) that can be tested by the three-dimensional profiler is obtained. 3 );

[0025] (33) According to the test parameters determined in steps (31) and (32), a wear-corrosion coupled damage test is performed to obtain the wear volume loss V, and the wear-corrosion mass loss rate Δm (g·N) is obtained according to the following formula: -1 ·m -1 ):

[0026]

[0027] Where ρ is the material density, g·mm -3 ; S is the total sliding distance of wear, m;

[0028] S=f·t·2d

[0029] After obtaining Δm at different temperatures, a relationship diagram is drawn with temperature T (°C) as the horizontal axis and Δm as the vertical axis. The obtained data points are fitted to obtain the functional relationship between Δm and T under the corresponding wear-corrosion conditions:

[0030] Δm=f(T)

[0031] Based on this relationship, the selection and design of materials in wear-corrosion coupled damage environments in different temperature ranges are guided, and the safe service life is predicted.

[0032] The beneficial effects of the present invention are:

[0033] The present invention can realize the wear-corrosion test process at different temperatures, quantitatively evaluate the wear-corrosion mass loss rate of different metal-based materials at various temperatures, and obtain the relationship between the wear-corrosion mass loss rate and temperature. It provides a material reliability evaluation method for key equipment serving in different temperature ranges, especially variable temperature conditions, establishes a basis for material selection, and predicts the safe service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 It is a cross-sectional schematic diagram of the present invention;

[0036] Figure 3 1 is a potentiodynamic polarization curve diagram of the laser cladding medium entropy alloy coating at various temperatures according to Example 1 of the present invention;

[0037] Figure 4 Graph showing the average wear-corrosion volume loss of the entropy alloy coating at various temperatures in laser cladding of Example 1 of the present invention;

[0038] Figure 5 This is a relationship diagram between the wear-corrosion mass loss rate and temperature of the entropy alloy coating in laser cladding in Example 1 of the present invention.

[0039] In the figure, 1. water inlet; 2. corrosive medium placement chamber; 3. friction and wear testing machine; 4. outer cover; 5. sealing ring A; 6. reference electrode; 7. counter electrode; 8. inner cover; 9. water outlet; 10. circulating liquid; 11. sealing ring B; 12. connecting plate; 13. outer cavity wall; 14. locking slider; 15. sample; 16. fixing block; 17. inlay layer; 18. inner cavity wall. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to embodiments and accompanying drawings, but is not limited thereto.

[0041] Example 1:

[0042] like Figure 1-2 As shown, this embodiment provides a high / low temperature wear-corrosion coupling damage test device, including a temperature-controllable corrosion test tank, a friction and wear testing machine 3, an electrochemical workstation and a high and low temperature external circulation temperature controller, wherein the friction and wear testing machine is provided with a temperature-controllable corrosion test tank, and the friction and wear performance test is realized by the reciprocating motion of the friction and wear testing machine. The temperature-controllable corrosion test tank is externally connected to the electrochemical workstation and the high and low temperature external circulation temperature controller for corrosion performance testing and temperature control.

[0043] The temperature-controlled corrosion test tank includes a connecting plate 12, an inner cavity wall 18 and an outer cavity wall 13. The bottom of the connecting plate 12 is arranged on the friction and wear testing machine 3. A rectangular outer cavity wall 13 is sealed on the connecting plate 12. The inner cavity wall 18 is arranged on the connecting plate inside the outer cavity wall 13. The inner cavity wall 18 is a hollow rectangular parallelepiped with an open top. The cavity between the outer cavity wall 13 and the inner cavity wall 18 is a temperature-controlled liquid circulation cavity. An outer cover plate 4 is provided on the temperature-controlled liquid circulation cavity. The cavity inside the inner cavity wall 18 is a corrosive medium placement cavity 2. An inner cover plate 8 is provided on the corrosive medium placement cavity 2. An opening for injecting corrosive liquid is provided in the middle of the inner cover plate 8. A reference electrode 6 and a counter electrode 7 are fixed to one side of the inner cover plate 8 through a fixing block 16. The reference electrode 6 and the counter electrode 7 are connected to an electrochemical workstation. The temperature-controlled liquid circulation cavity is connected to a high and low temperature external circulation temperature controller through a water inlet 1 and a water outlet 9 provided on the outer cavity wall 13.

[0044] A locking slider 14 is symmetrically arranged at the bottom of the corrosive medium placement chamber 2, and an insulating screw is arranged on the locking slider 14. A plurality of screw holes are arranged at the bottom of the corrosive medium placement chamber. The locking slider is used to clamp the sample 15. The clamping distance of the sample is adjusted by adjusting the fixed position of the insulating screw to meet the clamping requirements of samples of different sizes.

[0045] Circulating liquid 10 is provided in the temperature-controlled liquid circulation chamber.

[0046] The connecting plate 12 is an insulating plate. A sealing ring A5 is provided at the connection between the outer cover plate 4 and the temperature-controlled liquid circulation chamber. A sealing ring B11 is provided at the connection between the inner cover plate 8 and the corrosive medium placement chamber 2.

[0047] The position of the water inlet 1 is lower than the water outlet 9 to ensure that the circulating liquid fills the entire cavity.

[0048] Sample 15 is a metal-based material with good conductivity. Conductive tape is used to connect the copper wire on the back of the test surface of Sample 15. The other end of the copper wire is connected to the electrochemical workstation. The back of the test surface of the sample is cold-mounted with epoxy resin, exposing only the test surface, and the copper wire is led out from the side.

[0049] The high and low temperature external circulation temperature controller is used to achieve precise temperature control of ±0.1℃ within the range of -80~100℃.

[0050] The quantitative evaluation method of the high / low temperature wear-corrosion coupled damage test device is applied to the failure behavior test of the laser clad FeCrNi-based medium entropy alloy coating under the action of wear-corrosion coupled damage in high / low temperature environments. The steps are as follows:

[0051] (1) After cold mounting, the sample is placed in the corrosive medium placement chamber, the locking slider is adjusted to fix the sample, the reference electrode and the counter electrode are inserted into the fixing block, and the corrosive solution is injected. The corrosive solution is a 3.5% sodium chloride solution. The corrosive solution is made to cover the sample and the reference electrode and the counter electrode are made to penetrate. The reference electrode is a solid silver chloride electrode and the counter electrode is a platinum wire electrode. Then, the sample, reference electrode, and counter electrode are connected to the electrochemical workstation to form a three-electrode circuit.

[0052] (2) Insert the indenter of the friction and wear testing machine into the corrosive medium placement chamber and adjust it to the initial position of the friction and wear test;

[0053] (3) Turn on the high and low temperature external circulation temperature controller and set the required test temperature. The test temperatures include 30°C, 10°C, 0°C, -10°C and -30°C. Anhydrous ethanol is used as the temperature control circulating fluid. After the liquid temperature in each area of the corrosion chamber is consistent with the set temperature, start the friction and wear tester and electrochemical workstation at the same time to conduct the wear-corrosion coupling damage test.

[0054] Select 0.5V above the corrosion potential as the test potential; the wear positive pressure F n is 30N, and the wear reciprocating distance d is 3×10 -3 m, wear frequency f is 1 Hz, wear time t is 1800 s; based on the wear parameter settings, the total wear sliding distance is calculated as:

[0055] S=f·t·2d=1×1800×2×3×10 -3 =10.8m

[0056] During the experiment, the electrochemical workstation was first used to test the potentiodynamic polarization curves at various temperatures, such as Figure 3 As shown; determine the corrosion potential E corr With experimental potential E a After that, the wear-corrosion coupling damage test was carried out, and each temperature was tested three times. After the test, the sample was taken out and cleaned and dried, and the three-dimensional topography was used to obtain the average volume loss V of the three times, as shown in Figure 2. Figure 4 As shown; F n , d, f, t, V and ρ (here 7.98×10 -3 g·mm -3 ) is substituted into the wear-corrosion mass loss rate formula to obtain the mass loss rate Δm.

[0057]

[0058] According to the wear-corrosion mass loss rate at different temperatures, a temperature relationship diagram is drawn, such as Figure 5As shown, the Origin software was used to fit the change trend based on the obtained data to obtain the relationship between the wear-corrosion mass loss rate and temperature. The results show that the wear-corrosion mass loss rate of the laser-clad FeCrNi-based medium-entropy alloy coating is almost positively correlated with temperature. Under these wear-corrosion conditions, the functional relationship between Δm and T is Δm = 0.0297T + 4.62201. This embodiment clearly provides a material reliability evaluation method for key equipment serving in different temperature ranges, especially variable temperature conditions, establishes a basis for material selection, and can predict safe service life.

[0059] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high / low temperature wear-corrosion coupled damage test device, characterized in that: It includes a temperature-controllable corrosion test tank, a friction and wear testing machine, an electrochemical workstation and a high and low temperature external circulation temperature controller. The friction and wear testing machine is equipped with a temperature-controllable corrosion test tank, and the friction and wear performance test is achieved through the reciprocating motion of the friction and wear testing machine. The temperature-controllable corrosion test tank is externally connected to an electrochemical workstation and a high and low temperature external circulation temperature controller for corrosion performance testing and temperature control.

2. The high / low temperature wear-corrosion coupled damage testing device according to claim 1, characterized in that: The temperature-controlled corrosion test tank includes a connecting plate, an inner cavity wall and an outer cavity wall. The bottom of the connecting plate is arranged on the friction and wear testing machine. A rectangular outer cavity wall is sealed on the connecting plate. The inner cavity wall is arranged on the connecting plate inside the outer cavity wall. The inner cavity wall is a hollow rectangular parallelepiped with an open top. The cavity between the outer cavity wall and the inner cavity wall is a temperature-controlled liquid circulation cavity. An outer cover plate is arranged on the temperature-controlled liquid circulation cavity. The cavity inside the inner cavity wall is a corrosive medium placement cavity. An inner cover plate is arranged on the corrosive medium placement cavity. An opening for injecting corrosive liquid is arranged in the middle of the inner cover plate. A reference electrode and a counter electrode are fixed to one side of the inner cover plate through a fixing block. The reference electrode and the counter electrode are connected to an electrochemical workstation. The temperature-controlled liquid circulation cavity is connected to a high and low temperature external circulation temperature control machine through a water inlet and a water outlet arranged on the outer cavity wall.

3. The high / low temperature wear-corrosion coupled damage testing device according to claim 2, characterized in that: The bottom of the corrosive medium placement cavity is symmetrically provided with locking slides, which are provided with insulating screws. The bottom of the corrosive medium placement cavity is provided with a plurality of screw holes, and the locking slides are used to clamp the sample.

4. The high / low temperature wear-corrosion coupled damage testing device according to claim 3, characterized in that: Circulating liquid is arranged in the temperature-controlled liquid circulation cavity, and the circulating liquid is water or anhydrous ethanol.

5. The high / low temperature wear-corrosion coupled damage testing device according to claim 4, characterized in that: The connecting plate is an insulating plate. A sealing ring A is provided at the connection between the outer cover plate and the temperature-controlled liquid circulation cavity. A sealing ring B is provided at the connection between the inner cover plate and the corrosive medium placement cavity.

6. The high / low temperature wear-corrosion coupled damage testing device according to claim 5, characterized in that: The water inlet is located lower than the water outlet.

7. The high / low temperature wear-corrosion coupled damage testing device according to claim 6, characterized in that: Solid-state electrodes were used as reference electrodes and counter electrodes.

8. The high / low temperature wear-corrosion coupled damage testing device according to claim 7, characterized in that: The sample is made of metal-based material. The back of the sample test surface is connected to a copper wire using conductive tape. The other end of the copper wire is connected to the electrochemical workstation. The back of the sample test surface is cold-mounted using epoxy resin, exposing only the test surface, and the copper wire is led out from the side.

9. The quantitative evaluation method of the high / low temperature wear-corrosion coupled damage testing device according to claim 8, characterized in that: Here are the steps: (1) After cold mounting, place the sample in the corrosive medium placement chamber, adjust the locking slider to fix the sample, insert the reference electrode and the counter electrode into the fixing block, inject the corrosive solution so that the corrosive solution covers the sample and the reference electrode and the counter electrode penetrate, and then connect the sample, reference electrode and counter electrode to the electrochemical workstation to form a three-electrode circuit; (2) Insert the indenter of the friction and wear testing machine into the corrosive medium placement chamber and adjust it to the initial position of the friction and wear test; (3) Turn on the high and low temperature external circulation temperature controller, set the required test temperature, test the liquid temperature in each area of the corrosion chamber to be consistent with the set temperature, and then start the friction and wear testing machine and electrochemical workstation at the same time to conduct the wear-corrosion coupling damage test.

10. The quantitative evaluation method of the high / low temperature wear-corrosion coupled damage testing device according to claim 9, characterized in that: In step (3), a wear-corrosion coupled damage test is performed to draw a curve of wear-corrosion mass loss rate versus temperature, including: (31) Conduct potentiodynamic polarization test to determine the corrosion potential E at different temperatures corr (V), according to different materials and test requirements, in E corr The above anodic corrosion section selects a certain potential as E at each temperature. a,T (V); (32) Select different wear positive pressure F according to different materials and test requirements n (N), wear reciprocating distance d (m), wear frequency f (Hz) and wear time t (s) to ensure that the wear volume loss V (mm) that can be tested by the three-dimensional profiler is obtained. 3 ); (33) According to the test parameters determined in steps (31) and (32), a wear-corrosion coupled damage test is performed to obtain the wear volume loss V, and the wear-corrosion mass loss rate Δm (g·N) is obtained according to the following formula: -1 ·m -1 ): Where ρ is the material density, g·mm -3 ; S is the total sliding distance of wear, m; S=f·t·2d After obtaining Δm at different temperatures, a relationship diagram is drawn with temperature T (°C) as the horizontal axis and Δm as the vertical axis. The obtained data points are fitted to obtain the functional relationship between Δm and T under the corresponding wear-corrosion conditions: Δm=f(T) Based on this relationship, the selection and design of materials in wear-corrosion coupled damage environments in different temperature ranges are guided, and the safe service life is predicted.

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