Test device for predicting service life of abrasion-resistant coating
By designing a coating life prediction test device combining electrolytic cells and physical abrasive mechanism, the problem of lack of comprehensive evaluation of coating durability in the prior art is solved, and a more comprehensive and reliable evaluation of the coating under complex environmental conditions is achieved.
Patent Information
- Application Number
- CN202421034571.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The prior art lacks a comprehensive evaluation method when evaluating the long-term durability of coatings under complex environmental conditions, and cannot monitor and adapt to environmental changes in real time. The traditional method relies on a large number of manual experiments, which is time-consuming and cost-effective.
Design a wear-resistant coating life prediction test device, combining electrolytic cells and physical abrasion mechanism, simulates corrosion conditions such as soil and oceans, and comprehensive evaluation of coating performance is carried out through electrochemical and physical testing methods.
It achieves a more comprehensive and reliable assessment of the long-term durability of the coating under complex environmental conditions, and can monitor and adapt to environmental changes in real time, reducing experimental costs and time.
Smart Images
Figure CN222913450U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coating performance testing, in particular to a device for pre-testing the service life of a wear-resistant coating. Background Art
[0002] The phenomenon that substances are lost from the surface due to chemical or electrochemical reactions between materials and the surrounding media during the friction process is called corrosive wear. According to the nature of the corrosive medium, corrosive wear can be divided into two categories, namely chemical corrosive wear and electrochemical corrosive wear. Chemical corrosive wear refers to the wear of metal materials in gas media or non-electrolyte solutions, and the most important one is oxidation wear. Electrochemical corrosive wear refers to the wear of metal materials in conductive electrolyte solutions. Oxidation wear refers to the process in which the metal surface reacts with the gas medium to form an oxide film on the surface, and then is removed under the action of abrasives or micro-protrusions, and the newly exposed surface is oxidized and worn again. Electrochemical corrosive wear refers to the process in which the friction pair works in an electrolyte solution (such as acids, alkalis, salts, etc.) and reacts with them to form various different products, which are then removed during friction. The nature of the corrosive medium, the corrosive wear behavior of the same material in different media is different. In addition, the medium concentration, pH value and temperature will also affect corrosive wear; under strong wear - weak corrosion conditions, the wear resistance increases with the increase of carbon content, and vice versa, the wear resistance decreases under weak wear and strong corrosion conditions. The difference in the microstructure of steel after different heat treatments will also affect the wear resistance of steel; the magnitude and action frequency of the external load will also affect the wear resistance of materials.
[0003] Currently, the research on soil wear resistance of buried and subsea pipelines mainly focuses on traditional material protection methods, such as using different types of anti-corrosion coatings and basic research on the characteristics of soil, ocean, etc. Some studies have tried to evaluate the wear resistance of specific coating materials in simulated soil, ocean and other environments through laboratory tests, including physical and chemical tests, as well as experience-based performance prediction.
[0004] For example, Ni Weiliang et al. carried out electrochemical and salt spray tests through 7500-hour accelerated salt spray tests on inorganic zinc-rich coatings and thermal spray zinc coatings, and obtained the microscopic corrosion morphology, corrosion rate and corrosion mechanism of the two coatings, as well as the factors affecting the corrosion rate.
[0005] Also, for example, Li Zili et al. used a three-dimensional cellular automaton model to study the growth and evolution process of pit points on the metal matrix of pipelines in a soil corrosion environment.
[0006] For another example, the research by Chen Jiao et al. demonstrated the effectiveness of ceramic coatings in improving the abrasion resistance of materials, especially titanium alloys. The hardness, elastic modulus, and adhesion of the coatings were measured by nanoindentation and scratch methods, and the erosion tests were carried out at an angle of 45° and a speed of 100 m / s using a self-developed erosion device.
[0007] The main technical drawbacks of the above methods include insufficient prediction accuracy, inability to monitor and adapt to environmental changes in real time, and lack of comprehensive evaluation of the long-term durability of coatings under complex environmental conditions. In addition, traditional methods often rely on a large number of manual experiments, which are both time-consuming and may lead to data inconsistency, and the maintenance and operation costs are high. Especially due to the harshness of the marine environment, such as brine corrosion and extreme weather conditions, it increases the economic burden of technology application. Summary of the Invention
[0008] The purpose of the present utility model is to provide an experimental device for predicting the service life of wear-resistant coatings. An electrolytic cell is used for electrochemical corrosion, and a physical abrasion mechanism is built to realize the reciprocating motion friction between the upper and lower loads pressing, the left and right abrasion pairs and the coating sample, resulting in the microphysical loss of the coating. The combination of the two is used to achieve the expected simulation of the corrosion situation of buried pipeline coatings under real soil, marine and other conditions, and accurately simulate the influence of conditions such as the ocean and soil on pipeline coatings.
[0009] The purpose of the present utility model is achieved through the following technical solutions:
[0010] An experimental device for predicting the service life of wear-resistant coatings includes an abrasion mechanism and a corrosion mechanism; the corrosion mechanism is an electrolytic cell filled with electrolyte 22, the test piece 8 is fixedly connected to the bottom plate 15 of the electrolytic cell through a fixture 9, the counter electrode 17 and the reference electrode 20 extend into the electrolyte 22, and the working electrode 19 is connected to the surface of the test piece 8; the abrasion mechanism includes an abrasion pair 10 in contact with the test piece and a reciprocating motion mechanism, and the reciprocating motion mechanism includes an X-direction moving mechanism, a Y-direction moving mechanism, and a Z-direction moving mechanism, all of which include a moving part and a fixed part connected by sliding. The fixed part of the X-direction moving mechanism is fixedly connected to the side plate 14 of the electrolytic cell, the fixed part of the Z-direction moving mechanism is fixedly connected to the moving part of the X-direction moving mechanism, the fixed part of the Y-direction moving mechanism is connected to the moving part of the Z-direction moving mechanism, and the abrasion pair 10 is fixedly connected to the moving part of the Z-direction moving mechanism.
[0011] As a more preferable technical solution of the present application: the fixed part of the X-direction moving mechanism is an X-direction chute 12, the moving part is an X-direction slider 2, the X-direction slider 2 is installed on the X-direction chute 12, and the X-direction slider 2 is driven by an X-direction stepper motor 16.
[0012] As a more preferable technical solution of the present application: the X-direction chute 12 is fixedly connected to the side plate 14 of the electrolytic cell through a connecting piece 13.
[0013] As a more preferable technical solution of the present application: the fixed member of the Y-direction moving mechanism is a Y-direction sliding groove 5, the moving member is a Y-direction sliding block 7, the Y-direction sliding block 7 is installed on the Y-direction sliding groove 5, and the Y-direction sliding block 7 is driven by a Y-direction stepper motor 6.
[0014] As a more preferable technical solution of the present application: the fixed member of the Z-direction moving mechanism is a Z-direction sliding groove 1, the moving member is a Z-direction sliding block 3, the Z-direction sliding block 3 is installed on the Z-direction sliding groove 1, and the Z-direction sliding block 3 is driven by a Z-direction stepper motor 4.
[0015] As a more preferable technical solution of the present application: the comparison electrode 17, the reference electrode 20 and the working electrode 19 are fixedly connected to the cover plate 21 of the electrolytic cell.
[0016] As a more preferable technical solution of the present application: the comparison electrode 17, the reference electrode 20 and the working electrode 19 are connected to an electrochemical workstation 18.
[0017] Beneficial effects:
[0018] By combining the use of the electrolytic cell and the physical abrasion mechanism, the present utility model simulates real corrosion conditions such as soil and ocean, uses the electrolytic cell to simulate the electrochemical corrosion effect in seawater, and the physical abrasion mechanism simulates the abrasion caused by waves and ocean currents as well as the impact and friction of seabed particles on the coating, and cooperates with electrochemical methods and physical testing methods to comprehensively evaluate the coating performance. It solves the problem in the prior art of lacking a comprehensive evaluation of the long-term durability of the coating under complex environmental conditions, and more comprehensively considers the complexity of the marine environment, such as the influence of factors such as temperature change, salt concentration, water pressure change, and biological pollution on the coating performance, and provides more comprehensive and reliable evaluation results. Description of the drawings
[0019] Figure 1 It is a schematic structural diagram of the abrasion-resistant coating performance evaluation test device of the present utility model.
[0020] Figure 2 It is a schematic structural diagram of the abrasion mechanism of the abrasion-resistant coating performance evaluation test device of the present utility model.
[0021] Figure 3 It is a schematic structural diagram of the corrosion mechanism of the abrasion-resistant coating performance evaluation test device of the present utility model. Detailed implementation manners
[0022] The present utility model will be further described in detail below with reference to the drawings.
[0023] As Figures 1 to 3As shown in the figure, the present utility model provides a pre-testing device for the service life of a wear-resistant coating, which includes an abrasion mechanism and a corrosion mechanism. The corrosion mechanism is an electrolytic cell filled with electrolyte 22. The specimen to be tested 8 is fixedly connected to the bottom plate 15 of the electrolytic cell through a fixture 9. The counter electrode 17 and the reference electrode 20 extend into the electrolyte 22, and the working electrode 19 is connected to the surface of the specimen to be tested 8. The abrasion mechanism includes a counter grinding pair 10 in contact with the specimen to be tested and a reciprocating motion mechanism. The reciprocating motion mechanism includes an X-direction moving mechanism, a Y-direction moving mechanism, and a Z-direction moving mechanism, all of which include a moving part and a fixed part connected in a sliding manner. The fixed part of the X-direction moving mechanism is fixedly connected to the side plate 14 of the electrolytic cell. The fixed part of the Z-direction moving mechanism is fixedly connected to the moving part of the X-direction moving mechanism. The fixed part of the Y-direction moving mechanism is connected to the moving part of the Z-direction moving mechanism. The counter grinding pair 10 is fixedly connected to the moving part of the Z-direction moving mechanism.
[0024] In some embodiments, the fixed part of the X-direction moving mechanism is an X-direction sliding groove 12, and the moving part is an X-direction sliding block 2. The X-direction sliding block 2 is installed on the X-direction sliding groove 12, and the X-direction sliding block 2 is driven by an X-direction stepping motor 16.
[0025] In some embodiments, the X-direction sliding groove 12 is fixedly connected to the side plate 14 of the electrolytic cell through a connecting piece 13.
[0026] In some embodiments, the fixed part of the Y-direction moving mechanism is a Y-direction sliding groove 5, and the moving part is a Y-direction sliding block 7. The Y-direction sliding block 7 is installed on the Y-direction sliding groove 5, and the Y-direction sliding block 7 is driven by a Y-direction stepping motor 6.
[0027] In some embodiments, the fixed part of the Z-direction moving mechanism is a Z-direction sliding groove 1, and the moving part is a Z-direction sliding block 3. The Z-direction sliding block 3 is installed on the Z-direction sliding groove 1, and the Z-direction sliding block 3 is driven by a Z-direction stepping motor 4.
[0028] In some embodiments, the counter electrode 17, the reference electrode 20, and the working electrode 19 are fixedly connected to the cover plate 21 of the electrolytic cell.
[0029] In some embodiments, the counter electrode 17, the reference electrode 20, and the working electrode 19 are connected to an electrochemical workstation 18.
[0030] In the wear-resistant coating performance evaluation test device of the present utility model, the Y-direction moving mechanism provides a load for the test. The X-direction moving mechanism is used to make the counter grinding pair 10 move linearly on the surface of the specimen to be tested. The Z-direction moving mechanism is used to adjust the position of the counter grinding pair 10 on the surface of the specimen to be tested. By controlling the motor speed, the goal of fretting wear is achieved, thereby realizing the control of the reciprocating motion time, frequency, and friction force.
[0031] The utility model utilizes an electrolytic cell for electrochemical corrosion and builds a physical abrasion mechanism to achieve up-and-down load compression and reciprocating movement friction between the left-and-right grinding pairs and the coating sample, resulting in microscopic physical loss of the coating. The combination of the two is used to achieve the expected simulation of the corrosion of buried pipeline coatings under real soil, ocean and other conditions, accurately simulate the influence of conditions such as the ocean and soil on pipeline coatings, and ensure that corresponding countermeasures can be taken in a timely manner. In addition, the test bench can control parameters such as solution concentration, solution pH value, friction force, reciprocating movement time and frequency to reproduce the corrosion and wear conditions under different environmental conditions.
[0032] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or a connection through an intermediate medium. It can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0033] The above is only the preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present utility model.
Claims
1. A wear-resistant coating life prediction test device, characterized in that: It comprises an abrasion mechanism and a corrosion mechanism; the corrosion mechanism is equipped with an electrolytic cell with electrolyte, the test piece is fixedly connected to the bottom plate of the electrolytic cell through a clamp, the contrast electrode and the reference electrode extend into the electrolyte, and the working electrode is connected to the surface of the test piece; the abrasion mechanism comprises a grinding pair and a reciprocating mechanism contacting the test piece, the reciprocating mechanism comprises an X-direction moving mechanism, a Y-direction moving mechanism and a Z-direction moving mechanism, all of which comprise a slidingly connected moving part and a fixed part, the fixed part of the X-direction moving mechanism is fixedly connected to the side plate of the electrolytic cell, the fixed part of the Z-direction moving mechanism is fixedly connected to the moving part of the X-direction moving mechanism, the fixed part of the Y-direction moving mechanism is connected to the moving part of the Z-direction moving mechanism, and the grinding pair is fixedly connected to the moving part of the Z-direction moving mechanism.
2. The wear-resistant coating life prediction test device according to claim 1, characterized in that: The fixed part of the X-direction moving mechanism is an X-direction slide groove, the moving part is an X-direction slider, the X-direction slider is installed on the X-direction slide groove, and the X-direction slider is driven by an X-direction stepping motor.
3. The wear-resistant coating life prediction test device according to claim 1, characterized in that: The X-direction slideway is fixedly connected to the side plate of the electrolytic cell via a connecting piece.
4. The wear-resistant coating life prediction test device according to claim 1, characterized in that: The fixed part of the Y-direction moving mechanism is a Y-direction slide groove, the moving part is a Y-direction slider, the Y-direction slider is installed on the Y-direction slide groove, and the Y-direction slider is driven by a Y-direction stepping motor.
5. The wear-resistant coating life prediction test device according to claim 1, characterized in that: The fixed part of the Z-direction moving mechanism is a Z-direction slide groove, the moving part is a Z-direction slider, the Z-direction slider is installed on the Z-direction slide groove, and the Z-direction slider is driven by a Z-direction stepping motor.
6. The wear-resistant coating life prediction test device according to claim 1, characterized in that: The contrast electrode, reference electrode and working electrode are fixedly connected to the cover plate of the electrolytic cell.
7. The wear-resistant coating life prediction test device according to claim 1, characterized in that: The contrast electrode, reference electrode and working electrode are connected to an electrochemical workstation.