Corrosion working condition simulation test device and test method for rod-shaped member

Abstract

This invention discloses a corrosion simulation test apparatus and method for a rod-shaped component. The test apparatus includes: a frame; an electrochemical detection device, including: a receiving cavity; a reference electrode and a counter electrode; a test circuit; a friction device that applies a frictional force to the surface of the rod-shaped component in a first test state; a bending load device that applies a resisting force to the rod-shaped component in the first test state; and a limiting support device, including: a support portion comprising a first support member and a second support member spaced apart at both ends of the rod-shaped component in the first test state, the first and second support members restricting the movement of the rod-shaped component along the direction of the resisting force in the first test state; a limiting portion that restricts the movement of the rod-shaped component along its axial direction under the action of the frictional force in the first test state; a first driving device that drives the support portion and the bending load device to move closer to each other in the first test state, so that the bending load device applies the resisting force; and a second driving device that drives the friction device to apply the frictional force in the first test state.

Description

Technical Field

[0001] This invention relates to the field of testing equipment, and in particular to a corrosion simulation testing device and method for rod-shaped components. Background Technology

[0002] In the mechanical field, rod-shaped components are frequently used, and their performance is crucial. For example, in the hydraulic field, hydraulic cylinders are an important part of various machines, primarily responsible for power transmission and stroke control. Their working principle is to convert hydraulic energy into mechanical energy using the reciprocating linear motion of a piston rod. Therefore, the reliability of the piston rod directly affects the safety and reliability of mechanical products. In particular, some harsh environments place higher demands on the performance of piston rods. For example, piston rods in marine hydraulic cylinders and engineering machinery are subjected to harsh working environments with high salt, high humidity, high pressure, and strong corrosion for extended periods. They are also subjected to complex alternating loads such as tension and compression, as well as friction and wear with sealing rings.

[0003] To address the aforementioned service requirements, processes such as thermal spraying and electroplating are typically used to strengthen the surface of piston rods. However, while these piston rod coatings often meet performance requirements in individual wear, corrosion, or bending fatigue tests, under actual operating conditions, piston rods are simultaneously subjected to sea winds, wave swaying, seal wear, and high humidity and salt corrosion, often leading to accelerated damage to the piston rod coating. Therefore, it is necessary to design a testing device for rod-shaped components under the coupled effects of multiple operating conditions. Summary of the Invention

[0004] The purpose of this invention is to provide a test apparatus capable of simultaneously conducting coupled frictional load, bending load, and corrosion-related working condition simulation tests on rod-shaped members, and a test method using the test apparatus.

[0005] This invention discloses a corrosion simulation test device for rod-shaped components, comprising a first test state, including:

[0006] frame;

[0007] Electrochemical detection device, including:

[0008] A receiving cavity, located at the bottom of the frame, is placed in a corrosive liquid for immersing the rod-shaped member to be tested during the first test state;

[0009] The reference electrode and the counter electrode are inserted into the corrosive solution in the first test state;

[0010] The test circuit is connected to the rod-shaped member, the reference electrode, and the counter electrode in the first test state.

[0011] A friction device applies a frictional force along the axial direction of the rod to the surface of the rod in a first test state;

[0012] The bending load device, in a first test state, presses against the rod-shaped member and applies a pressure to the rod assembly to apply a bending load to the rod-shaped member;

[0013] A limiting support device, used to support and limit the rod-shaped member in a first test state, includes:

[0014] The support includes a first support member and a second support member that are spaced apart and supported at both ends of the rod-shaped member in a first test state. The first support member and the second support member restrict the movement of the rod-shaped member in the direction of the resisting force in the first test state.

[0015] The limiting part restricts the movement of the rod-shaped member along its axial direction under the action of the frictional force in the first test state;

[0016] A first driving device drives the support and the bending load device to move closer to each other in a first test state, so that the bending load device applies the resisting force.

[0017] The second driving device drives the friction device to apply the frictional force in the first test state.

[0018] In some embodiments, both the first support member and the second support member have V-shaped grooves. In a first test state, the two ends of the rod-shaped member are respectively supported in the V-shaped grooves of the first support member and the second support member. The first driving device is drivenly connected to the first support member and the second support member. In the first test state, the first driving device drives the first support member and the second support member to approach the bending load device.

[0019] In some embodiments, the limiting portion includes a first limiting member and a second limiting member spaced apart and supported at both ends of the rod-shaped member. The first supporting member and the second supporting member are located within the interval between the first limiting member and the second limiting member. Both the first limiting member and the second limiting member have V-shaped grooves, and the groove opening direction of the V-shaped grooves is the same as the groove opening direction of the V-shaped grooves of the first supporting member and the second supporting member. The rod-shaped member includes a middle rod and two rod ends located at both ends with a cross-sectional area smaller than the middle rod. The middle rod and the two rod ends respectively form two stepped surfaces. In a first test state, the two rod ends are respectively located in the V-shaped grooves of the first limiting member and the second limiting member, and the end faces of the V-shaped grooves of the first limiting member and the second limiting member restrict the movement of the two stepped surfaces along the axial direction of the rod-shaped member by contacting the stepped surfaces.

[0020] In some embodiments, the bending load device includes a first bending load portion and a second bending load portion spaced apart for applying resistance pressure, wherein the first support member and the second support member are located within the interval between the first bending load portion and the second bending load portion.

[0021] In some embodiments, both the first bending load portion and the second bending load portion include a connecting portion fixedly connected to the frame and a roller rotatably disposed on the connecting portion. In a first test state, both the first bending load portion and the second bending load portion apply the resisting force to the rod-shaped member through the roller.

[0022] In some embodiments, the connecting portion includes a T-shaped block, and both the first bending load portion and the second bending load portion further include a connecting piece with one end fixedly connected to the T-shaped block, and the roller is hinged to the connecting piece.

[0023] In some embodiments, the friction device includes a friction wheel whose axis is perpendicular to the axis of the rod, the friction wheel having an aligned state in which its outer peripheral surface is aligned with the surface of the rod during testing and a disengaged state in which its outer peripheral surface is offset from the surface of the rod, the second driving device including a drive shaft drivenly connected to the friction wheel, the second driving device being configured to switch the friction wheel between the aligned state and the disengaged state by driving the drive shaft to move axially along the drive shaft.

[0024] In some embodiments, the frame is a box structure with an inner cavity. The friction device, the bending load device, and the limiting support device are all disposed in the inner cavity of the box structure. The corrosion condition simulation test device for the rod-shaped member also includes a base and a column fixedly connected to the base. The box structure is fixed to the base by the column. The first driving device is disposed on the base and passes through the bottom of the box structure to enter the inner cavity and is driven to connect with the support.

[0025] In some embodiments, a control device connected to the first drive device and the second drive device via signals is further included. The control device is configured to control the first drive device to drive the bending load device to periodically apply the resistance force and to control the second drive device to periodically apply the friction force in a first test state.

[0026] The second aspect of this invention discloses a method for simulating corrosion conditions of rod-shaped components, using any of the aforementioned rod-shaped component corrosion condition simulation test apparatus, comprising:

[0027] The rod-shaped member is immersed in the corrosive liquid located in the receiving cavity, and the rod-shaped member is supported on the first support member and the second support member;

[0028] The test circuit is connected to the reference electrode, the counter electrode, and the rod to perform electrochemical corrosion on the rod. At the same time, the first driving device drives the bending load device and the support to move closer to each other to apply a bending load to the rod, and the second driving device drives the friction device to apply a frictional force along the axial direction of the rod.

[0029] In some embodiments, the rod-shaped member is a piston rod, the piston rod includes a substrate and a coating on the outer surface of the substrate, and the corrosion condition simulation test method for the rod-shaped member further includes applying a negative potential to the piston rod using the circuit, the absolute value of the negative potential being less than the absolute value of the corrosion potential of the substrate and greater than the absolute value of the corrosion potential of the coating.

[0030] Based on the corrosion condition simulation test device provided by the present invention, by setting up an electrochemical detection device, a friction device, a bending load device and a limiting support device, it is possible to conduct a first test condition simulation test on the rod-shaped component with friction load, bending load and corrosion coupled. The setting of the limiting support device helps to ensure the smooth progress of the first test condition, thereby enabling a more realistic simulation test of the rod-shaped component.

[0031] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0032] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the structure of the corrosion simulation test device for rod-shaped components according to an embodiment of the present invention;

[0034] Figure 2 for Figure 1 A partial structural schematic diagram of the corrosion simulation test device for the rod-shaped component shown. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0037] In the description of this invention, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0038] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0039] like Figure 1 and Figure 2 The corrosion simulation test device for the rod-shaped component shown has a first test state. The corrosion simulation test device includes a frame 11, an electrochemical detection device, a friction device, a bending load device, a limiting support device, a first drive device 71, and a second drive device.

[0040] Frame 11 is used to install devices such as friction devices, bending load devices, and limit support devices.

[0041] The electrochemical detection device includes a receiving cavity 23, a reference electrode 21, a counter electrode 22, and a test circuit.

[0042] The receiving cavity 23 is located at the bottom of the frame 11. During the first test, the receiving cavity 23 is filled with a corrosive liquid used to immerse the rod-shaped member 100 to be tested. The receiving cavity 23 is a cavity structure capable of containing liquid, such as... Figure 1 and Figure 2 In the illustrated embodiment, frame 11 includes a box structure, and the receiving cavity 23 is part of the bottom of the internal cavity of the box structure. In some embodiments not shown, the receiving cavity 23 may also be an independent cavity. The corrosive liquid is a solution used to simulate the working environment of the rod-shaped member 100, and may be an electrolyte. In some tests simulating seabed conditions, the corrosive liquid may also be seawater, etc. Figure 1 and Figure 2 As shown, the reference electrode 21 and the counter electrode 22 are inserted into the etching solution in the first test state. In the first test state, the test circuit is electrically connected to the rod 100, the reference electrode 21, and the counter electrode 22. In the first test state, the etching solution electrochemically etches the surface of the rod in contact with it. The electrochemical detection device can simulate and detect the electrochemical corrosion of the rod. In the embodiment shown, the test circuit includes lines connected to the reference electrode 21, the counter electrode 22, and the end of the rod, as well as an electrochemical workstation 20. The electrochemical workstation 20 can control the electrochemical detection of the rod and detect the performance of the rod. For example, the electrochemical workstation may include a potentiostat module to detect the current density at the contact surface between the piston rod and the electrolyte, and may also include an electrochemical impedance spectroscopy module for detecting the electrochemical impedance between the rod and the counter electrode.

[0043] In the first test state, the friction device applies a frictional force along the axial direction of the rod 100 to the surface of the rod 100. In the first test state, the bending load device presses against the rod 100 and applies a pressure to the rod assembly to apply a bending load to the rod 100; the bending load device applies pressure (i.e., pressure) by pressing against the rod 100, and the rod 100 is bent by this pressure, thereby applying a bending load to the rod 100.

[0044] The limiting support device is used to support and limit the rod-shaped member 100 in the first test state. The limiting support device includes a support part and a limiting part.

[0045] The support includes a first support member 411 and a second support member 412 spaced apart at both ends of the rod-shaped member 100 in a first test state. The first support member 411 and the second support member 412 restrict the movement of the rod-shaped member 100 in the direction of the resisting force in the first test state. The first support member 411 and the second support member 412 cooperate with the bending load device to apply a bending load to the rod-shaped member 100. The first support member 411 and the second support member 412 restrict the movement of the rod-shaped member 100, so that the bending load device can press against the rod-shaped member 100 to apply a resisting force. The spaced arrangement of the first support member 411 and the second support member 412 provides stable support and limitation for the rod-shaped member 100, and also helps to improve the bending effect applied to the rod-shaped member 100 by the bending load device.

[0046] The limiting part restricts the axial movement of the rod-shaped member 100 under the action of frictional force in the first test state. When the friction device applies frictional force to the rod-shaped member 100, the rod-shaped member 100 moves under the action of frictional force. The limiting part restricts the movement of the rod-shaped member 100, preventing it from moving further along its axial direction, or preventing the rod-shaped member 100 from moving along its axial direction at all. After restricting the axial movement of the rod-shaped member 100, the friction device can stably apply frictional force to the rod-shaped member 100 in the first test state.

[0047] The first test state refers to the state in which the corrosion working condition simulation test device applies electrochemical corrosion, surface friction force and bending load to the rod 100. In the first test state, the rod 100 can be subjected to corrosion, friction and bending load at the same time, which can more realistically simulate the actual working conditions of the rod 100.

[0048] In the first test state, the first driving device 71 drives the support and the bending device to move closer together, so that the bending device applies a counterforce. That is, the first driving device 71 drives the rod-shaped member 100 to press against the bending device, so that the bending device can apply a counterforce to the rod-shaped member 100. In the embodiment shown in the figure, the first driving device 71 drives the first support member 411 and the second support member 412 to support the rod-shaped member 100 and move closer to the bending device, so that the rod-shaped member 100 presses against the bending device, so that the bending device applies a counterforce.

[0049] The second drive unit drives the friction device to apply frictional force in the first test state.

[0050] The corrosion simulation test apparatus of this embodiment, by setting up an electrochemical detection device, a friction device, a bending load device, and a limiting support device, can conduct a first test condition simulation test on the rod-shaped member 100 under the coupling of friction load, bending load, and corrosion. The setting of the limiting support device helps to ensure the smooth progress of the first test condition, thereby enabling a simulation test of the rod-shaped member 100 that is closer to the working environment.

[0051] In some embodiments, to make the support for the rod 100 more stable, such as Figure 2 As shown, both the first support member 411 and the second support member 412 have V-grooves. In the first test state, both ends of the rod-shaped member 100 are supported in the V-grooves of the first support member 411 and the second support member 412, respectively. The first driving device 71 is driven to connect with the first support member 411 and the second support member 412. In the first test state, the first driving device 71 drives the first support member 411 and the second support member 412 to move closer to the bending load device. In this embodiment, by setting the V-grooves, the support for the rod-shaped member 100 can be made more stable. At the same time, when the bending load device applies a counterforce, the influence of the bending effect of the bending load applied to the bending load device can be reduced.

[0052] In some embodiments, such as Figure 2 As shown, the limiting part includes a first limiting member 421 and a second limiting member 422 spaced apart and supported at both ends of the rod-shaped member 100. A first support member 411 and a second support member 412 are located within the interval between the first limiting member 421 and the second limiting member 422. Both the first limiting member 421 and the second limiting member 422 have V-shaped grooves, and the groove opening direction is the same as the groove opening direction of the V-shaped grooves of the first support member 411 and the second support member 412. The rod-shaped member 100 includes a middle rod and two rod ends with a cross-sectional area smaller than the middle rod. The middle rod and the two rod ends respectively form two stepped surfaces. The middle portion of the rod-shaped member 100 with a larger diameter is the middle rod, and the portions at both ends with a smaller diameter than the middle portion are the rod ends. From the middle rod to the rod ends, due to the change in diameter (change in cross-sectional area), stepped surfaces are formed in the middle rod and rod end portions. In the first test state, the two rod ends are respectively located in the V-groove of the first limiting member 421 and the V-groove of the second limiting member 422, and the end faces of the V-groove of the first limiting member 421 and the V-groove of the second limiting member 422 restrict the movement of the two stepped surfaces along the axial direction of the rod-shaped member 100 by contacting the stepped surfaces. Figure 2As shown, the V-shaped groove of the first limiting member 421 encloses the rod end of the rod-shaped member 100. When the end face of the V-shaped groove near the second limiting member 422 contacts the stepped surface, it restricts the movement of the stepped surface of the rod-shaped member 100 away from the second limiting member 422. Similarly, the V-shaped groove of the second limiting member 422 encloses the other rod end of the rod-shaped member 100, while restricting the movement of the rod-shaped member 100 away from the first limiting member 421. In this embodiment, in a non-first test state, when no bending load is applied to the rod 100 and the first drive device 71 retracts, the first limiting member 421 and the second limiting member 422 can support the rod 100. When switching to the first test state, the first support member 411 and the second support member 412 can support the rod 100, while the groove walls of the V-shaped grooves of the first limiting member 421 and the second limiting member 422 are disengaged from the rod end of the rod. The first limiting member 421 and the second limiting member 422 can limit the axial movement of the rod 100 without affecting the bending load applied to the rod 100 by the bending load device, and can also limit the movement of the rod 100 in other radial directions.

[0053] In some embodiments, the bending load device includes a first bending load portion 51 and a second bending load portion 52 spaced apart for applying resistance pressure, and a first support member 411 and a second support member 412 located within the interval between the first bending load portion 51 and the second bending load portion 52. With this configuration, in the first test state, when the bending load device applies resistance pressure to the rod-shaped member 100, the rod-shaped member is subjected to resistance pressure at four spaced points: the first support member 411, the second support member 412, the first bending load portion 51, and the second bending load portion 52, that is, a four-point bending load can be applied to the rod-shaped member.

[0054] In some embodiments, such as Figure 2 As shown, both the first bending load portion 51 and the second bending load portion 52 include a connecting portion fixedly connected to the frame 11 and a roller 61 rotatably mounted on the connecting portion. In the first test state, both the first bending load portion 51 and the second bending load portion 52 apply a resisting force to the rod-shaped member 100 through the roller 61. The use of roller 61 to apply the resisting force reduces damage to the surface of the rod-shaped member 100 when the bending device applies the resisting force. Since the roller 61 can roll, this embodiment provides a more stable application of the resisting force to the rod-shaped member 100.

[0055] In some embodiments, such as Figure 2 As shown, the connecting part includes a T-shaped block 622, and the first bending load part 51 and the second bending load part 52 each include a connecting piece 621 with one end fixedly connected to the T-shaped block 622, and the roller 61 is hinged to the connecting piece 621.

[0056] In some embodiments, such as Figure 2As shown, the friction device includes a friction wheel 32 whose axial direction is perpendicular to the axial direction of the rod 100. The friction wheel 32 has an aligned state in which its outer peripheral surface (i.e., circumferential surface) is aligned with the surface of the rod 100 during the test, and a disengaged state in which its outer peripheral surface is misaligned with the surface of the rod 100. In the embodiment shown, in the aligned state, the outer peripheral surface of the friction wheel 32 is located directly above the surface of the rod 100. That is, when the first driving device 71 drives the rod 100 to press against the bending device, the surface of the rod 100 will contact the outer peripheral surface of the friction wheel 32, and the friction wheel 32 can apply frictional force to the rod 100. In the disengaged state, the outer peripheral surface of the friction wheel 32 is not located directly above the surface of the rod 100. That is, when the first driving device 71 drives the rod 100 to press against the bending device, the surface of the rod 100 is misaligned and does not contact the outer peripheral surface of the friction wheel 32, and the friction wheel 32 will not apply frictional force to the rod 100. The second drive device includes a drive shaft 31 drivenly connected to the friction wheel 32. The second drive device is configured to switch the friction wheel 32 between an aligned state and a disengaged state by driving the drive shaft 31 to move axially along the drive shaft 31. In the embodiment shown, the second drive device can switch between the aligned state and the disengaged state by extending and retracting the drive shaft 31. When the drive shaft 31 is extended, frictional force can be applied to the rod 100 through the friction wheel. When the drive shaft 31 is retracted, the friction wheel does not rub against the rod 100, thereby allowing a coupled test of bending load and electrochemical corrosion to be applied only to the rod 100. In some embodiments, the friction wheel is a rubber wheel.

[0057] In some embodiments, such as Figure 1 and Figure 2 As shown, frame 11 is a box structure with an inner cavity. The friction device, bending load device, and limiting support device are all located in the inner cavity of the box structure. The corrosion condition simulation test device for rod-shaped members also includes a base 13 and columns 12 fixedly connected to the base 13. The box structure is fixed to the base 13 by the columns 12. In the embodiment shown, the corrosion condition simulation test device includes a loading fixing plate 14, the bending load device is fixed on the loading fixing plate 14, and the box structure is fixed to the base 13 by the loading fixing plate 14 and four columns 12. The first driving device 71 is located on the base 13 and passes through the bottom of the box structure into the inner cavity before being driven and connected to the support. In the embodiment shown, the first driving device 71 includes a hydraulic cylinder actuator, which includes two relatively telescopic upper and lower parts. The lower part is fixedly connected to the base, and the upper part passes through the box structure and is slidably and sealed to the box structure. After passing through the box structure, the upper part is fixedly connected to the support.

[0058] In some embodiments, the corrosion condition simulation test apparatus further includes a control device 234 that is signal-connected to the first drive device 71 and the second drive device. The control device 234 is configured to control the first drive device 71 to drive the bending load device to periodically apply the resistance force and control the second drive device to periodically apply the friction force in a first test state, thereby applying friction fatigue and bending fatigue loads to the rod 100.

[0059] In some embodiments, the corrosion condition simulation test apparatus further includes a friction control and detection system 30 connected to the friction device and a bending load control and detection system 40 connected to the bending load device and the first drive device. The friction control and detection system 30 is used to control the operation of the friction device and detect the performance of the rod-shaped member 100 under frictional force. The bending load control and detection system 40 is used to control the bending load device to apply resistance pressure and to detect the performance of the rod-shaped member 100 under resistance pressure. The control device 234 is connected to the electrochemical workstation 20, the friction control and detection system 30, and the bending load control and detection system 40 for unified control of the electrochemical workstation 20, the friction control and detection system 30, and the bending load control and detection system 40. In some embodiments, the corrosion condition simulation test apparatus further includes a display device 230 connected to the control device.

[0060] In some embodiments, a corrosion condition simulation test method for a rod-shaped member 100 is also disclosed, using any of the above-mentioned rod-shaped member corrosion condition simulation test apparatus. The corrosion condition simulation test method includes:

[0061] The rod-shaped member 100 is immersed in the corrosive liquid located in the receiving cavity 23, and the rod-shaped member 100 is supported on the first support member 411 and the second support member 412.

[0062] The test circuit is connected to the reference electrode 21, the counter electrode 22 and the rod 100 to perform electrochemical corrosion on the rod 100. At the same time, the first drive device 71 drives the bending load device and the support to move closer to each other to apply a bending load to the rod 100, and the second drive device drives the friction device to apply a friction force along the axial direction of the rod 100.

[0063] In some embodiments, the rod-shaped member 100 is a piston rod, which includes a substrate and a coating on the outer surface of the substrate. The corrosion simulation test method for the rod-shaped member 100 further includes applying a negative potential to the piston rod using a circuit. The absolute value of the negative potential is less than the absolute value of the corrosion potential of the substrate and greater than the absolute value of the corrosion potential of the coating. The coating of the piston rod is in contact with the corrosive liquid, and the surface of the piston rod outside the coating is provided with an insulating material to insulate it from the corrosive liquid. In the embodiment shown in the figure, the insulating material is epoxy resin. By setting this negative potential, this embodiment can accelerate the corrosion of the piston rod substrate and reduce the impact on the piston rod coating, thereby accelerating the simulation effect of the electrochemical corrosion of the piston rod and more effectively testing the performance of the piston rod coating.

[0064] In some embodiments, the corrosion condition simulation test method further includes simulating a bending fatigue test using a coating bending fatigue test method based on the substrate yield strength of the piston rod as the loading factor; when applying bending fatigue to the piston rod, the loading force is 90% of the yield strength of the piston rod substrate.

[0065] In some embodiments, the control device and control system described above may be a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described in this invention.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A corrosion simulation test device for rod-shaped components, comprising a first test state, characterized in that, include: frame; Electrochemical detection device, including: A receiving cavity, located at the bottom of the frame, is placed in a corrosive liquid for immersing the rod-shaped member to be tested during the first test state; The reference electrode and the counter electrode are inserted into the corrosive solution in the first test state; The test circuit is connected to the rod-shaped member, the reference electrode, and the counter electrode in the first test state. A friction device applies a frictional force along the axial direction of the rod to the surface of the rod in a first test state. The friction device includes a friction wheel whose axial direction is perpendicular to the axial direction of the rod. The friction wheel has an alignment state in which its outer peripheral surface is aligned with the surface of the rod during the test and a disengagement state in which its outer peripheral surface is misaligned with the surface of the rod. A bending load device, in a first test state, presses against the rod and applies a pressure to the rod to apply a bending load to the rod; A limiting support device, used to support and limit the rod-shaped member in a first test state, includes: The support includes a first support member and a second support member that are spaced apart and supported at both ends of the rod-shaped member in a first test state. The first support member and the second support member restrict the movement of the rod-shaped member in the direction of the resisting force in the first test state. The limiting part restricts the movement of the rod-shaped member along its axial direction under the action of the frictional force in the first test state; A first driving device drives the support and the bending load device to move closer to each other in a first test state, so that the bending load device applies the resisting force. A second drive device drives the friction device to apply the friction force in the first test state. The second drive device includes a drive shaft that is driven to the friction wheel. The second drive device is configured to switch the friction wheel between the aligned state and the disengaged state by driving the drive shaft to move along the axial direction of the drive shaft.

2. The corrosion simulation test device for rod-shaped components as described in claim 1, characterized in that, Both the first support member and the second support member have V-shaped grooves. In the first test state, the two ends of the rod-shaped member are respectively supported in the V-shaped grooves of the first support member and the second support member. The first driving device is driven to connect with the first support member and the second support member. In the first test state, the first driving device drives the first support member and the second support member to approach the bending load device.

3. The corrosion simulation test device for rod-shaped components as described in claim 2, characterized in that, The limiting part includes a first limiting member and a second limiting member spaced apart and supported at both ends of the rod-shaped member. The first and second supporting members are located within the interval between the first and second limiting members. Both the first and second limiting members have V-shaped grooves, and the groove opening direction is the same as the groove opening direction of the V-shaped grooves of the first and second supporting members. The rod-shaped member includes a middle rod and two rod ends located at both ends with a cross-sectional area smaller than the middle rod. The middle rod and the two rod ends respectively form two stepped surfaces. In a first test state, the two rod ends are respectively located in the V-shaped grooves of the first and second limiting members, and the end faces of the V-shaped grooves of the first and second limiting members restrict the movement of the two stepped surfaces along the axial direction of the rod-shaped member by contacting the stepped surfaces.

4. The corrosion simulation test apparatus for rod-shaped members as described in any one of claims 1 to 3, characterized in that, The bending load device includes a first bending load section and a second bending load section arranged at intervals for applying resistance pressure in a first test state, wherein the first support member and the second support member are located within the interval between the first bending load section and the second bending load section.

5. The corrosion simulation test device for rod-shaped components as described in claim 4, characterized in that, Both the first bending load portion and the second bending load portion include a connecting portion fixedly connected to the frame and a roller rotatably disposed on the connecting portion. In the first test state, both the first bending load portion and the second bending load portion apply the resisting force to the rod-shaped member through the roller.

6. The corrosion simulation test apparatus for rod-shaped components as described in claim 5, characterized in that, The connecting part includes a T-shaped block, and the first bending load part and the second bending load part each include a connecting piece with one end fixedly connected to the T-shaped block, and the roller is hinged to the connecting piece.

7. The corrosion simulation test apparatus for rod-shaped members as described in any one of claims 1 to 3, characterized in that, The frame is a box structure with an inner cavity. The friction device, the bending load device, and the limiting support device are all located in the inner cavity of the box structure. The corrosion simulation test device for the rod-shaped member also includes a base and a column fixedly connected to the base. The box structure is fixed to the base by the column. The first driving device is located on the base and passes through the bottom of the box structure into the inner cavity before being driven to connect with the support part.

8. The corrosion simulation test apparatus for rod-shaped members as described in any one of claims 1 to 3, characterized in that, It also includes a control device that is signal-connected to the first drive device and the second drive device, the control device being configured to control the first drive device to periodically apply the resistance force to the bending load device and to control the second drive device to periodically apply the friction force in a first test state.

9. A method for simulating corrosion conditions of rod-shaped components, characterized in that, The corrosion simulation test apparatus for rod-shaped members as described in any one of claims 1 to 8 includes: The rod-shaped member is immersed in the corrosive liquid located in the receiving cavity, and the rod-shaped member is supported on the first support member and the second support member; The test circuit is connected to the reference electrode, the counter electrode, and the rod to perform electrochemical corrosion on the rod. At the same time, the first driving device drives the bending load device and the support to move closer to each other to apply a bending load to the rod, and the second driving device drives the friction device to apply a frictional force along the axial direction of the rod.

10. The corrosion simulation test method for rod-shaped components as described in claim 9, characterized in that, The rod-shaped member is a piston rod, which includes a substrate and a coating on the outer surface of the substrate. The corrosion simulation test method for the rod-shaped member further includes applying a negative potential to the piston rod using the circuit. The absolute value of the negative potential is less than the absolute value of the corrosion potential of the substrate and greater than the absolute value of the corrosion potential of the coating.

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