Device for testing abrasion and corrosion performance of polymer metal friction pair

Abstract

The invention relates to the field of friction corrosion testing, and particularly discloses a polymer metal friction pair abrasion corrosion performance testing device which comprises a base, a polymer clamp box module and a metal ball clamping rod module. The polymer clamp box module comprises a solution box which is fixedly arranged on the base and used for containing an electrolyte solution, a lower sample polymer block, a reference electrode and a counter electrode are fixedly arranged in the solution box, and the reference electrode and the counter electrode are both connected to the electrochemical workstation; the metal ball clamping rod module is used for clamping an upper sample metal ball, and the upper sample metal ball serves as a working electrode to be connected to the electrochemical workstation. The metal ball is used as the upper sample and the working electrode, and the polymer block is used as the lower sample, so that the problem that the abrasion loss of a polymer is difficult to accurately quantify in a traditional friction corrosion test is solved, and meanwhile, coupling test integration of friction behaviors and corrosion electric signals can be realized.

Description

Technical Field

[0001] The present application relates to the field of friction corrosion testing, and in particular to a testing device for the wear corrosion performance of a polymer-metal friction pair. Background Art

[0002] Polymer friction pair materials have been widely used in marine equipment and mechanical systems due to their multiple advantages, such as self-lubrication, corrosion resistance, light weight and low cost. These include key motion friction pairs such as ship water-lubricated bearings, underwater launch guides and seawater pumps. In these application environments, friction pairs usually work in a metal / polymer pairing form. Since metal materials are prone to electrochemical corrosion in corrosive media such as seawater, resulting in degradation of the surface structure of the friction pair, the synergistic wear and corrosion effect between them and the polymer material becomes a key factor affecting the service performance and life of the equipment. Therefore, systematic research on the wear-corrosion interaction behavior of metal / polymer friction pairs under corrosive conditions has important engineering application value.

[0003] Currently, friction and corrosion testing primarily relies on the integration of a tribometer and a three-electrode electrochemical testing system. This allows for in-situ testing of material corrosion characteristics, including open-circuit potential, AC impedance spectroscopy, and polarization curves, while simultaneously testing tribological properties (such as friction coefficient and wear volume). Existing testing devices often utilize a "polymer ball stud-metal flat block" configuration, where the metal specimen also serves as the working electrode. This configuration draws heavily on established structural designs in ceramic / metal friction pairs, using a high-hardness ball to create clear wear marks on the metal surface, facilitating subsequent topographic measurement and wear analysis. Furthermore, this configuration offers excellent operational compatibility in terms of mechanical loading, sample preparation, and clamping. Consequently, despite the significantly lower hardness of polymer materials than ceramics, many existing studies continue to use this conventional configuration.

[0004] However, because metals are significantly harder than polymers, it is difficult to form clearly measurable wear pits on the metal surface during friction, making it difficult to quantitatively evaluate the wear on the metal side of the friction pair. Therefore, it is impossible to assess the degree of wear using metal samples, and measurement work mainly focuses on the wear analysis of polymer pins. Existing polymer wear measurements mainly use two methods: one is the weighing method, which uses a precision balance to measure the mass difference between the front and back of the polymer sample; the other is the optical measurement method, which uses a microscope to measure the geometric dimensions of the wear scar. However, both methods have obvious limitations in actual operation: under medium and low speed and low load conditions, the wear of polymer materials is extremely small, and even using a high-precision balance, it is difficult to measure the mass change; and when the polymer ball pin has a slight deflection, the wear scar morphology produced by its contact with the metal flat block is often irregular, resulting in large errors and poor repeatability in the optical measurement results.

[0005] Therefore, at this stage, there is an urgent need to develop a wear-corrosion performance testing device for polymer / metal friction pairs with a reasonable structure, high measurement accuracy, and easy operation, so as to improve the efficiency and reliability of obtaining friction and corrosion data and provide a scientific basis for the selection and optimization of related materials in complex service environments. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the present application provides a test device for the wear and corrosion performance of polymer-metal friction pairs.

[0007] The present application provides a test device for the wear and corrosion performance of polymer metal friction pairs using the following technical solutions: A test device for the wear and corrosion performance of a polymer-metal friction pair, comprising: base; A polymer fixture box module, comprising a solution box fixedly mounted on the base for containing an electrolyte solution, wherein a lower sample polymer block, a reference electrode, and a counter electrode are fixedly mounted in the solution box, and the reference electrode and the counter electrode are both connected to an electrochemical workstation; A metal ball clamping rod module is used to clamp the upper sample metal ball, and the upper sample metal ball is connected to the electrochemical workstation as a working electrode; The polymer fixture box module and the metal ball clamping rod module can move back and forth relative to each other, so that the upper sample metal ball rubs back and forth on the surface of the lower sample polymer block.

[0008] The device provided in this application uses a polymer block as the lower sample and a metal ball as the upper sample and working electrode. During the reciprocating friction process, crescent-shaped wear pits with regular cross-sections can be formed on the polymer block. The wear marks have good symmetry and boundary clarity. Conventional non-contact optical instruments (such as laser scanning confocal microscopes) can be used for high-precision measurement, and the volume wear amount can be accurately calculated in combination with geometric parameters, thereby improving the accuracy and repeatability of wear measurement, effectively improving the problem of difficult accurate quantification of polymer wear amount in traditional friction corrosion tests, and at the same time realizing the coupled test integration of friction behavior and corrosion electrical signals.

[0009] Furthermore, the metal ball clamping rod module includes an insulating sleeve with one end closed and the other end open, the open end of the insulating sleeve is provided with a clamping assembly for clamping the upper sample metal ball, and a conductive elastic part is provided in the insulating sleeve for conducting the electrical signal of the upper sample metal ball.

[0010] The metal ball clamping rod module clamps the upper sample metal ball through the clamping assembly, and at the same time realizes the conductive connection between the upper sample metal ball and the electrochemical workstation through the conductive elastic part, so that the metal ball can serve as both the upper sample and the working electrode.

[0011] Furthermore, the clamping assembly includes a spring steel chuck and a chuck nut, the chuck nut is threadedly connected to the open end of the insulating sleeve, and the spring steel chuck is fixedly arranged in the insulating sleeve; the spring steel chuck includes a chuck end, a circular through hole is provided in the center of the chuck end for clamping the upper sample metal ball, the outer periphery of the chuck end is provided as a conical surface, and the inner periphery of the chuck nut abuts against the conical surface.

[0012] Furthermore, when the chuck nut is tightened or loosened at the open end of the insulating sleeve, the conical surface converts the axial movement of the chuck nut along the insulating sleeve into radial deformation of the chuck end, causing the chuck end to shrink inward or expand outward, thereby clamping or releasing the upper sample metal ball.

[0013] The spring steel collet cooperates with the collet nut to provide radial preload without damaging the surface of the upper metal ball, thus achieving high-strength clamping.

[0014] Furthermore, an insulating film tube is provided through the spring steel chuck, the outer periphery of the insulating film tube contacts the inner periphery of the spring steel chuck, and the inner periphery of the insulating film tube contacts the upper sample metal ball.

[0015] Furthermore, the conductive elastic member is a conductive spring, one end of the conductive spring is inserted into the insulating film tube and abuts against the upper sample metal ball, and the other end of the conductive spring abuts against the closed end of the insulating sleeve.

[0016] Furthermore, a side wall of the insulating sleeve is provided with an opening for exposing the conductive spring.

[0017] The conductive spring contacts the upper sample metal ball for electrical conduction, and the opening on the side wall of the insulating sleeve facilitates connecting the conductive spring to the electrochemical workstation through a wire, so that the metal ball can serve as both the upper sample and the working electrode; the insulating film cylinder insulates and isolates the upper sample metal ball from the spring steel chuck to block the conduction of electrical signals to metal components such as the spring steel chuck during the test, preventing galvanic corrosion between the upper sample metal ball and dissimilar metals such as the spring steel chuck and the chuck nut in the electrolyte solution, thereby ensuring that the friction corrosion behavior truly reflects the performance of the friction contact interface between the metal ball and the polymer block; the above structure can solve the problems of electrical isolation and conductive reliability in a compact space.

[0018] When the upper sample metal ball is clamped by the clamping assembly, the conductive spring is in a compressed state, thereby applying axial pressure to the upper sample metal ball, further improving the clamping stability of the upper sample metal ball and the stability of the friction contact.

[0019] Furthermore, the polymer fixture box module also includes a first fastener and a second fastener, the first fastener is used to fix the lower sample polymer block to the inner bottom wall of the solution box; the second fastener is used to fix the reference electrode or counter electrode to the solution box, and fix the solution box to the base.

[0020] The first fastener helps to prevent the lower specimen polymer block from shifting or vibrating during testing, thereby maintaining stable friction contact.

[0021] Furthermore, it also includes a magnetic field applying module for applying a magnetic field to the polymer-metal friction pair.

[0022] Furthermore, the magnetic field application module includes a magnetic field module bracket fixedly arranged on the base and a fine-tuning slider slidably arranged on the magnetic field module bracket, a magnet is fixedly arranged on the fine-tuning slider, and a fine-tuning drive assembly is arranged on the magnetic field module bracket for driving the fine-tuning slider close to or away from the polymer fixture box module.

[0023] The fine-tuning drive assembly drives the fine-tuning slider toward or away from the polymer fixture box module, and the magnet applies a magnetic field to the polymer-metal friction pair, thereby enabling the friction and corrosion behaviors of the polymer-metal friction pair in a magnetic field environment to be studied.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The device provided in this application uses a polymer block as the lower sample and a metal ball as both the upper sample and the working electrode. During reciprocating friction, it can form crescent-shaped wear pits with regular cross-sections on the polymer block. These wear scars have good symmetry and clear boundaries. Conventional non-contact optical instruments (such as laser scanning confocal microscopes) can be used for high-precision measurement, and the volumetric wear loss can be accurately calculated by combining geometric parameters, thereby improving the accuracy and repeatability of wear measurement. This effectively overcomes the difficulty in accurately quantifying polymer wear loss in traditional friction-corrosion testing, and can also achieve coupled testing and integration of friction behavior and corrosion electrical signals. 2. The clamping of the upper sample metal ball and the integration of the electrode are achieved by using a spring steel chuck and a conical clamping nut structure. This provides radial preload without damaging the metal ball surface, achieving high-strength clamping. Furthermore, a conductive spring is provided inside the insulating rod to achieve surface contact and electrical conductivity with the upper end face of the metal ball, ensuring stable transmission of electrical signals. This solves the problems of electrical isolation and conductive reliability in a compact space, allowing the metal ball to serve as both the upper sample and the working electrode. 3. This application does not have any special and complex requirements for the preparation of working electrode samples. Only conventional metal balls are required, which avoids the tedious steps of wrapping metal block samples with insulating tape to limit the exposed area of ​​the electrode. It significantly improves the test efficiency and reduces the experimental cost, providing convenient conditions for continuous and batch friction corrosion performance evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 Schematic diagram of the exploded structure of the polymer fixture box module in an embodiment of the present application; Figure 3 This is a schematic structural diagram of a metal ball clamping rod module in an embodiment of the present application; Figure 4 Schematic diagram of the exploded structure of the metal ball clamping rod module in an embodiment of the present application; Figure 5 It is a structural diagram of the magnetic field application module in an embodiment of the present application.

[0026] Figure markings: 1. base; 2. polymer fixture box module; 21. solution box; 22. lower sample polymer block; 23. reference electrode; 24. counter electrode; 25. reference electrode fixture; 26. counter electrode fixture; 27. solution box screw; 28. lower sample screw; 3. metal ball clamping rod module; 31. insulating sleeve; 311. opening; 32. spring steel chuck; 321. conical surface; 33. chuck nut; 34. insulating film cylinder; 35. conductive spring; 36. upper sample metal ball; 4. magnetic field application module; 41. magnetic field module bracket; 42. fine-tuning slider; 43. magnet; 44. fine-tuning drive assembly; 5. electrochemical workstation. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-5 This application is described in further detail.

[0028] The present application discloses a test device for the wear and corrosion performance of a polymer metal friction pair. Figure 1 The testing device for the wear and corrosion performance of a polymer-metal friction pair includes a base 1, a polymer fixture box module 2, a metal ball clamping rod module 3, a magnetic field application module 4 and an electrochemical workstation 5.

[0029] Reference Figure 1 and Figure 2The polymer fixture module 2 includes a solution box 21 fixedly mounted on the base 1. The solution box 21 contains an electrolyte solution (preferably an artificial seawater solution to simulate actual marine service environments). A lower sample polymer block 22, a reference electrode 23, and a counter electrode 24 are fixedly mounted in the solution box 21. These three electrodes are immersed in the electrolyte solution. Both the reference electrode 23 and the counter electrode 24 are connected to the electrochemical workstation 5.

[0030] Reference Figure 1 and Figure 3 The metal ball clamping rod module 3 is used to clamp the upper sample metal ball 36, and the upper sample metal ball 36 is connected to the electrochemical workstation 5 as a working electrode.

[0031] The electrochemical workstation 5 adopts the classic three-electrode system. Figure 1 RE, WE, and CE represent the reference electrode, working electrode, and counter electrode, respectively. The electrochemical reaction occurs on the surface of the working electrode. The electrochemical workstation 5 monitors the current or potential changes of the working electrode in real time to analyze the corrosion behavior of the material. The reference electrode is an electrode with a constant and known potential, such as a saturated calomel electrode or a silver-silver chloride electrode, to provide a stable potential reference. The counter electrode is made of an inert material, such as a platinum electrode, and forms a closed circuit with the working electrode.

[0032] In order to achieve synchronous integrated observation of electrochemical signals and wear behavior, the polymer fixture box module 2 and the metal ball clamping rod module 3 can move back and forth relative to each other, so that the upper sample metal ball 36 rubs back and forth on the surface of the lower sample polymer block 22.

[0033] In one embodiment, the base 1 is mounted on a fixed platform, and the metal ball clamping rod module 3 is clamped by a fixture and driven by a driving device to achieve relative reciprocating movement between the polymer clamping box module 2 and the metal ball clamping rod module 3. In another embodiment, the base 1 is mounted on a reciprocating platform, and the metal ball clamping rod module 3 is fixed, which can also achieve relative reciprocating movement between the polymer clamping box module 2 and the metal ball clamping rod module 3.

[0034] The device provided in the present application uses a polymer block as the lower sample and a metal ball as the upper sample and working electrode. During the reciprocating friction process, a crescent-shaped wear pit with a regular cross-section can be formed on the surface of the lower sample polymer block 22. The wear mark has good symmetry and boundary clarity. Conventional non-contact optical instruments (such as laser scanning confocal microscopes) can be used for high-precision measurement, and the volume wear amount can be accurately calculated in combination with geometric parameters, thereby improving the accuracy and repeatability of wear measurement, effectively improving the problem of difficult accurate quantification of polymer wear amount in traditional friction corrosion tests, and at the same time, it can realize the coupled test integration of friction behavior and corrosion electrical signals.

[0035] Reference Figure 2 The reference electrode 23 and the counter electrode 24 are clamped by a reference electrode clamp 25 and a counter electrode clamp 26 respectively. The polymer clamp box module 2 also includes a first fastener and a second fastener.

[0036] Specifically, refer to Figure 2 The first fasteners are two lower sample screws 28 threadedly connected to the inner bottom wall of the solution box 21. The two lower sample screws 28 are symmetrically arranged on both sides of the lower sample polymer block 22. The heads of the lower sample screws 28 abut against the upper end surface edge of the lower sample polymer block 22, applying a clamping force to the lower sample polymer block 22, thereby fixing the lower sample polymer block 22 to the inner bottom wall of the solution box 21, which helps to avoid position displacement or vibration of the lower sample polymer block 22 caused by factors such as swelling, heat, and load deformation during the test, thereby maintaining stable friction contact.

[0037] Reference Figure 2 The second fasteners are two solution box screws 27 symmetrically arranged on either side of the solution box 21. One solution box screw 27 penetrates the reference electrode fixture 25 and one side wall of the solution box 21 and is threadedly connected to the base 1. The other solution box screw 27 penetrates the counter electrode fixture 26 and the other side wall of the solution box 21 and is threadedly connected to the base 1. In this way, the reference electrode 23 and the counter electrode 24 are fixed in the solution box 21, and the solution box 21 is fixed to the base 1. The reference electrode 23 and the counter electrode 24 are respectively located on either side of the lower sample polymer block 22. Both the reference electrode 23 and the counter electrode 24 are immersed in the electrolyte solution and do not contact the bottom of the solution box 21.

[0038] The solution box 21 is made of a polymer insulating material, has good corrosion resistance and electrical insulation, and can effectively isolate stray current interference.

[0039] Reference Figure 3 and Figure 4 The metal ball clamping rod module 3 includes an insulating sleeve 31 with one end closed and the other open. Made of polyetheretherketone (PEEK), a material with excellent high-temperature and corrosion resistance, the insulating sleeve 31 ensures electrical insulation and mechanical strength for long-term service. The open end of the insulating sleeve 31 houses a clamping assembly for holding the upper sample metal ball 36. A conductive elastic member is housed within the insulating sleeve 31 to conduct electrical signals from the upper sample metal ball 36.

[0040] Specifically, refer to Figure 3 and Figure 4The clamping assembly includes a spring steel collet 32 ​​and a collet nut 33. The open end of the insulating sleeve 31 is provided with an external thread. The collet nut 33 is threadedly connected to the open end of the insulating sleeve 31. The spring steel collet 32 ​​is fixedly disposed in the insulating sleeve 31. The spring steel collet 32 ​​includes a collet end with a circular through-hole at the center thereof for clamping the upper sample metal ball 36. The outer periphery of the collet end is provided with a conical surface 321, and the inner periphery of the collet nut 33 abuts against the conical surface 321.

[0041] When the collet nut 33 is tightened or loosened on the open end of the insulating sleeve 31, the conical surface 321 converts the axial movement of the collet nut 33 along the insulating sleeve 31 into radial deformation of the collet end. This causes the collet end to contract inward under the pressure of the collet nut 33 or to expand outward under the deformation force of the collet end itself, thereby clamping or releasing the upper sample metal ball 36. The spring steel collet 32 ​​and collet nut 33 work together to provide radial preload without damaging the surface of the upper sample metal ball 36, achieving a high-strength clamp.

[0042] Further, refer to Figure 3 and Figure 4 An insulating film tube 34 is inserted through the spring steel chuck 32. The outer periphery of the insulating film tube 34 contacts the inner periphery of the spring steel chuck 32, and the inner periphery of the insulating film tube 34 contacts the upper sample metal ball 36. The insulating film tube 34 is made of a polytetrafluoroethylene (PTFE) hard film with excellent chemical inertness and mechanical flexibility to achieve effective interface isolation and structural stability.

[0043] Reference Figure 3 and Figure 4 The conductive elastic member is a conductive spring 35. One end of the conductive spring 35 is inserted into the insulating film cylinder 34 and abuts the upper sample metal ball 36. The other end of the conductive spring 35 abuts the closed end of the insulating sleeve 31. The side wall of the insulating sleeve 31 is provided with an opening 311 for exposing the conductive spring 35. The opening 311 is a square hole.

[0044] Conductive spring 35 contacts and conducts electricity with upper sample metal ball 36. Opening 311 in the sidewall of insulating sleeve 31 facilitates connecting conductive spring 35 to electrochemical workstation 5 via a wire, allowing upper sample metal ball 36 to double as a working electrode. Insulating film sleeve 34 insulates upper sample metal ball 36 from spring steel chuck 32, blocking the conduction of electrical signals to metal components such as spring steel chuck 32 during testing. This prevents galvanic corrosion between upper sample metal ball 36, spring steel chuck 32, chuck nut 33, and other dissimilar metals in the electrolyte solution, thereby ensuring that tribo-corrosion behavior truly reflects the performance of the frictional contact interface between the metal ball and the polymer block. This structure addresses both electrical isolation and conductivity reliability within a compact footprint.

[0045] When the upper sample metal ball 36 is clamped by the clamping assembly, the conductive spring 35 is in a compressed state. The compressed conductive spring 35 applies axial pressure to the upper sample metal ball 36, further improving the clamping stability of the upper sample metal ball 36 and the stability of the friction contact.

[0046] In the clamped state, the area of ​​the upper sample metal ball 36 (working electrode) exposed to the electrolyte solution is a constant value 2πR 2 , where R is the radius of the upper sample metal ball 36 to ensure the comparability and quantification of electrochemical test parameters.

[0047] Reference Figure 1 and Figure 5 The magnetic field application module 4 is used to apply a magnetic field to the polymer-metal friction pair. It includes a magnetic field module bracket 41 fixedly mounted on the base 1 and a fine-tuning slider 42 slidably mounted on the magnetic field module bracket 41. A magnet 43, which can be a permanent magnet or an electromagnet, is fixedly mounted on the fine-tuning slider 42. The fine-tuning driver assembly 44, which can be a ball screw mechanism, is mounted on the magnetic field module bracket 41 to drive the fine-tuning slider 42, carrying the magnet 43, toward or away from the polymer fixture box module 2.

[0048] Magnet 43 applies a magnetic field to the polymer-metal friction pair, enabling the study of the friction and corrosion behavior of the polymer-metal friction pair in a magnetic field. Fine-tuning drive assembly 44 drives fine-tuning slider 42 toward or away from polymer fixture module 2, thereby adjusting the distance between magnet 43 and the contact area of ​​the friction pair, thereby adjusting the magnetic field strength in the contact area.

[0049] Example 1: Using the above-mentioned test apparatus for the wear and corrosion performance of a polymer-metal friction pair, a GCr15 metal ball (7 mm in diameter) was used as the upper sample metal ball 36, and an ultra-high molecular weight polyethylene block (UHMWPE) was used as the lower sample polymer block 22. The test was conducted in the absence of a magnetic field, as follows: Step 1: Fix the lower sample polymer block 22 in the solution box 21 using the lower sample screw 28, fix the reference electrode 23 and the counter electrode 24 in the solution box 21 using the solution box screw 27, and fix the solution box 21 to the base 1; install the base 1 on a fixed platform, and then add an appropriate amount of artificial seawater solution to the solution box 21.

[0050] Step 2: Install the conductive spring 35, spring steel chuck 32, and insulating film tube 34 in the insulating sleeve 31, install the upper sample metal ball 36 on one end of the insulating film tube 34, and tighten the chuck nut 33 at the open end of the insulating sleeve 31 to achieve stable clamping of the upper sample metal ball 36.

[0051] Step 3: Connect the conductive spring 35, the reference electrode 23 and the counter electrode 24 to the electrochemical workstation 5 respectively, and use an external driving mechanism to drive the insulating sleeve 31 to perform linear reciprocating motion, so that the upper sample metal ball 36 rubs back and forth on the surface of the lower sample polymer block 22, and the corrosion behavior of the working electrode (upper sample metal ball 36) is monitored in real time through the electrochemical workstation 5; after completing the set number of frictions, the crescent-shaped wear pits with regular cross-sections formed on the surface of the lower sample polymer block 22 are measured by optical instruments such as a laser scanning confocal microscope, and the volume wear of the lower sample polymer block 22 is calculated based on the geometric parameters obtained by the measurement, and then the wear behavior of the polymer-metal friction pair is analyzed.

[0052] Example 2: Using the above-mentioned test device for the wear and corrosion performance of polymer-metal friction pairs, a GCr15 metal ball (7 mm in diameter) was used as the upper sample metal ball 36, and an ultra-high molecular weight polyethylene block (UHMWPE) was used as the lower sample polymer block 22. The test was conducted under an external magnetic field. The difference from Example 1 is that step 3 also includes the following steps: The fine-tuning drive assembly 44 is used to drive the fine-tuning slider 42 toward or away from the polymer fixture box module 2, thereby adjusting the distance between the magnet 43 and the contact area of ​​the friction pair. The magnet 43 applies a constant magnetic field strength to the contact area of ​​the friction pair, thereby studying the friction and corrosion behavior of the polymer-metal friction pair in a magnetic field environment.

[0053] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A test device for the wear and corrosion performance of polymer-metal friction pairs, characterized by: include: base; A polymer fixture box module, comprising a solution box fixedly mounted on the base for containing an electrolyte solution, wherein a lower sample polymer block, a reference electrode, and a counter electrode are fixedly mounted in the solution box, and the reference electrode and the counter electrode are both connected to an electrochemical workstation; A metal ball clamping rod module is used to clamp the upper sample metal ball, and the upper sample metal ball is connected to the electrochemical workstation as a working electrode; The polymer fixture box module and the metal ball clamping rod module can move back and forth relative to each other, so that the upper sample metal ball rubs back and forth on the surface of the lower sample polymer block.

2. The wear and corrosion performance testing device for polymer-metal friction pairs according to claim 1, characterized in that: The metal ball clamping rod module includes an insulating sleeve with one end closed and the other end open. The open end of the insulating sleeve is provided with a clamping assembly for clamping the upper sample metal ball. A conductive elastic part is provided in the insulating sleeve for conducting the electrical signal of the upper sample metal ball.

3. The wear and corrosion performance testing device for polymer-metal friction pairs according to claim 2, characterized in that: The clamping assembly includes a spring steel chuck and a chuck nut, the chuck nut is threadedly connected to the open end of the insulating sleeve, and the spring steel chuck is fixedly arranged in the insulating sleeve; the spring steel chuck includes a chuck end, a circular through hole is provided in the center of the chuck end for clamping the upper sample metal ball, the outer periphery of the chuck end is provided as a conical surface, and the inner periphery of the chuck nut abuts against the conical surface.

4. The wear and corrosion performance testing device for polymer-metal friction pairs according to claim 3, characterized in that: When the chuck nut is tightened or loosened at the open end of the insulating sleeve, the conical surface converts the axial movement of the chuck nut along the insulating sleeve into radial deformation of the chuck end, causing the chuck end to shrink inward or expand outward, thereby clamping or releasing the upper sample metal ball.

5. The wear and corrosion performance testing device for polymer-metal friction pairs according to claim 3, characterized in that: An insulating film tube is provided through the spring steel chuck, the outer periphery of the insulating film tube contacts the inner periphery of the spring steel chuck, and the inner periphery of the insulating film tube contacts the upper sample metal ball.

6. The wear and corrosion performance testing device for polymer-metal friction pairs according to claim 5, characterized in that: The conductive elastic member is a conductive spring, one end of which is inserted into the insulating film cylinder and abuts against the upper sample metal ball, and the other end of which abuts against the closed end of the insulating sleeve.

7. The wear and corrosion performance testing device for polymer-metal friction pairs according to claim 6, characterized in that: The side wall of the insulating sleeve is provided with an opening for exposing the conductive spring.

8. The wear and corrosion performance testing device for polymer-metal friction pairs according to claim 1, characterized in that: The polymer fixture box module further includes a first fastener and a second fastener, wherein the first fastener is used to fix the lower sample polymer block to the inner bottom wall of the solution box; The second fastener is used to fix the reference electrode or the counter electrode to the solution box, and to fix the solution box to the base.

9. The wear and corrosion performance testing device for polymer-metal friction pairs according to claim 1, characterized in that: The invention also includes a magnetic field applying module for applying a magnetic field to the polymer-metal friction pair.

10. The wear and corrosion performance testing device for polymer-metal friction pairs according to claim 9, characterized in that: The magnetic field application module includes a magnetic field module bracket fixedly arranged on the base and a fine-tuning slider slidably arranged on the magnetic field module bracket, a magnet is fixedly arranged on the fine-tuning slider, and a fine-tuning drive assembly is arranged on the magnetic field module bracket for driving the fine-tuning slider towards or away from the polymer fixture box module.

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