Multifunctional zinc coating adhesive force testing device and method

Abstract

The invention relates to a multifunctional zinc coating adhesive force testing device and method, and the device comprises a testing platform which comprises a working platform and a clamping mechanism capable of adjustably fixing a sample; the power system comprises a servo motor, the servo motor is connected with a longitudinal stretching rod, and the servo motor can drive the longitudinal stretching rod to ascend and descend and can drive the longitudinal stretching rod to move in the horizontal direction; the replaceable testing head assembly comprises an adhesive tape method testing head for qualitatively analyzing the adhesive force of the zinc coating and a stretching method testing head for quantitatively analyzing the adhesive force of the zinc coating, and the adhesive tape method testing head or the stretching method testing head is detachably connected to the longitudinal stretching rod; the detection system comprises a pressure sensor, a displacement sensor and a temperature sensor; and a control system. According to the invention, the adhesive force of the zinc coating is efficiently and accurately tested, and the technical problems of narrow application scene, poor data reliability and high operation intensity of the existing device are solved.

Description

Technical Field

[0001] This invention relates to the field of material surface treatment testing technology, and in particular to a multifunctional zinc coating adhesion testing device and method. Background Technology

[0002] Galvanized coatings, as a common protective coating for metal surfaces, are widely used in many fields such as machinery manufacturing, construction engineering, transportation, and power facilities due to their excellent corrosion resistance, good ductility, and relatively low cost. The adhesion between the galvanized layer and the base metal is a key performance indicator determining the service life and safety of galvanized products. Insufficient adhesion can lead to peeling and flaking of the galvanized layer, directly exposing the base metal to the corrosive environment, significantly shortening the product's service life, and even causing serious safety hazards such as equipment failure and structural damage. Therefore, accurate and efficient testing of galvanized layer adhesion is a crucial step in ensuring the quality of galvanized products and promoting high-quality development in related industries.

[0003] Currently, the main testing methods for the adhesion of galvanized coatings in the industry include the tape method, cross-cut test, tensile test, and bending test. Among them, the tape method, as a relatively basic qualitative test method, is relatively simple to operate, but it can only make a rough judgment by observing the residual galvanized layer after the tape is peeled off, and cannot obtain specific adhesion values. Moreover, the test results are easily affected by human factors such as operator technique and tape application force, resulting in low accuracy. Although the cross-cut test can reflect the coating adhesion level to a certain extent, it is also a qualitative or semi-quantitative test, and it has specific requirements for coating thickness, thus limiting its applicability.

[0004] Tensile testing, as one of the mainstream methods for quantitative testing, can calculate adhesion by measuring the tensile force required for coating peeling, offering relatively high accuracy. However, existing tensile testing devices generally suffer from limited functionality—most devices can only perform a single type of tensile test, failing to meet qualitative testing needs. Simultaneous qualitative and quantitative testing requires changing different equipment, resulting in cumbersome operation and low testing efficiency. Furthermore, some tensile testing devices have structural design flaws: firstly, the work platform lacks a convenient horizontal adjustment mechanism, making it difficult to ensure the perpendicularity of the sample to the tensile direction during testing, easily leading to data deviations; secondly, the contact heads of existing devices are mostly fixed structures, unable to be flexibly replaced according to testing requirements, and some components used for auxiliary testing (such as viscous media) lack gradient design, making it difficult to adapt to the testing requirements of zinc coatings with different adhesion levels.

[0005] Therefore, developing a zinc coating adhesion testing device that combines qualitative and quantitative testing functions, has high testing accuracy, is easy to operate, can adapt to various testing scenarios, and has a high degree of intelligence is of great practical significance and industry value.

[0006] Therefore, based on years of experience and practice in related industries, the inventor proposes a multifunctional zinc coating adhesion testing device and method to overcome the shortcomings of existing technologies. Summary of the Invention

[0007] The purpose of this invention is to provide a multifunctional zinc coating adhesion testing device and method, which enables efficient and accurate testing of zinc coating adhesion, and solves the technical problems of existing devices having narrow application scenarios, poor data reliability, and high operational intensity.

[0008] The objective of this invention is achieved by providing a multifunctional zinc coating adhesion testing device, comprising: The testing platform includes a work platform for supporting a sample with a galvanized coating and a clamping mechanism for adjusting and fixing the sample. The power system includes a servo motor, on which a longitudinal tension rod is connected. The servo motor can drive the longitudinal tension rod to rise and fall and can also drive the longitudinal tension rod to move in the horizontal direction. A replaceable test head assembly includes a tape test head for qualitative analysis of zinc coating adhesion and a tensile test head for quantitative analysis of zinc coating adhesion, wherein the tape test head or the tensile test head is detachably connected to the longitudinal tensile rod. The detection system includes a pressure sensor for real-time monitoring of the tensile force change of the longitudinal tension rod, a displacement sensor for real-time monitoring of the displacement change of the longitudinal tension rod, and a temperature sensor for real-time detection of the temperature of the tensile test head. The control system, the power system, the replaceable test head assembly, and the detection system are all electrically connected to the control system.

[0009] In a preferred embodiment of the present invention, the tape test head includes a tape, a bearing, and a test head bracket. The test head bracket is detachably connected to the longitudinal tension rod. The tape has a gradient viscosity and is arranged in a roll. The tape is rotatably connected to the test head bracket through the bearing.

[0010] In a preferred embodiment of the present invention, a threaded section is provided in the middle of the longitudinal tension rod, a threaded connection hole is provided on the test head bracket, the test head bracket is sleeved and connected to the threaded section through the threaded connection hole, and an anti-loosening nut is provided above the threaded section of the test head bracket.

[0011] In a preferred embodiment of the present invention, the tensile test head is detachably connected to the bottom of the longitudinal tensile rod, and the tensile test head is provided with a resistance wire and the temperature sensor; the bottom of the longitudinal tensile rod is provided with an internal threaded groove, and the tensile test head is provided with a threaded protrusion, which is detachably connected to the internal threaded groove.

[0012] In a preferred embodiment of the present invention, a platform connection threaded hole is provided on the working platform; the working platform is supported on a base, the base includes a threaded column rod, the bottom of the column rod is provided with an anti-slip bottom, the column rod passes through and is connected to the platform connection threaded hole, and a fine adjustment knob is provided at the position of the column rod below the working platform, the fine adjustment knob is used to rotate and adjust the level of the working platform so that the zinc plating layer of the sample is in a horizontal state.

[0013] In a preferred embodiment of the present invention, at least two columns are provided on the working platform, a crossbeam is provided between the two columns, a chain is provided on the crossbeam, a servo motor is connected to the chain, a longitudinal tension rod is connected to the chain, and the servo motor drives the chain to move the longitudinal tension rod horizontally.

[0014] In a preferred embodiment of the present invention, the clamping mechanism includes a clamping bracket and a fixing bolt. The clamping bracket is disposed on the working platform, and the fixing bolt is adjustablely connected to the clamping bracket. One end of the fixing bolt can press against and clamp the sample.

[0015] The objective of this invention can also be achieved by providing a multifunctional zinc coating adhesion testing method, implemented using a multifunctional zinc coating adhesion testing device; comprising: placing a sample with a zinc coating flat and fixing it on a work platform; connecting a tape test head to a longitudinal tensile rod for qualitative analysis of zinc coating adhesion, or connecting a tensile test head to a longitudinal tensile rod for quantitative analysis of zinc coating adhesion.

[0016] In a preferred embodiment of the present invention, the qualitative analysis of the adhesion of the galvanized layer includes the following steps: The surface of the sample with the zinc coating is pretreated; the pretreated sample is placed on the work platform and fixed by the clamping mechanism. Connect the tape test head to the longitudinal tension bar; set the tape's downward pressure, moving speed, and moving distance through the control system; When the test is started, the servo motor drives the longitudinal tension rod to descend, and the tape of the tape test head descends synchronously. The bottom of the tape contacts the galvanized layer surface of the sample. After the preset pressure is reached, the longitudinal tension rod stops pressing down, and the tape adheres to the galvanized layer. After the pressure is maintained for a set time, the servo motor drives the chain to move at a preset speed. The longitudinal tension rod moves the tape to expand and cover the test area of ​​the sample. After moving a set distance, the servo motor stops. Remove the sample and observe the state of the galvanized layer after bonding with tapes of different viscosities in the test area to make a qualitative judgment on the adhesion level.

[0017] In a preferred embodiment of the present invention, the quantitative analysis of the adhesion of the zinc coating includes the following steps: The surface of the sample with the galvanized layer is pretreated; the pretreated sample is placed on the work platform and fixed by the clamping mechanism; the test area of ​​the galvanized layer is coated with adhesive; Connect the tensile test head to the longitudinal tensile rod; Test parameters, including curing temperature, curing time, and tensile movement speed, are set through the control system. Start the servo motor to drive the longitudinal tension rod down so that the tensile test head contacts the adhesive. The test is started. The resistance wire inside the tensile test head is heated and kept at a set temperature for a set time. After the adhesive cures, the servo motor drives the longitudinal tensile rod to move upward until the galvanized layer separates from the steel plate substrate of the sample. The tensile stress and displacement are recorded. Calculate the adhesion force to complete the quantitative analysis of the adhesion force of the galvanized layer.

[0018] As described above, the multifunctional zinc coating adhesion testing device and method of the present invention have the following beneficial effects: In the multifunctional zinc coating adhesion testing device of the present invention, the replaceable test head assembly includes a tape method test head and a tensile method test head, which can be selected to achieve rapid switching between qualitative and quantitative testing functions; the clamping mechanism adopts a combination of "bracket + fixing bolt", which can be adapted to various thicknesses of steel plates, angle steel, H steel and other different grades / specifications of samples, solving the problem of narrow application scenarios of existing devices; the detection system provides a guarantee for accurate acquisition of test data.

[0019] By adjusting the pressure applied to the sample using a fixed adhesive tape test head and controlling its movement speed, human error can be reduced. Adhesive tapes with gradient viscosities can further reduce testing errors, determine the range of adhesion strength, and enable qualitative analysis of adhesion. A temperature sensor inside the tensile test head monitors the real-time temperature of the test head. An internal resistance wire, working in conjunction with the temperature sensor, provides heating, shortening curing time during the adhesive curing process and significantly improving testing efficiency.

[0020] This invention can achieve qualitative and quantitative analysis of various types of adhesion, realize efficient and accurate testing of galvanized layer adhesion, and solve the technical problems of existing devices having narrow application scenarios, poor data reliability, and high operational intensity. Attached Figure Description

[0021] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the invention. Wherein: Figure 1 This is a schematic diagram of the multifunctional zinc coating adhesion testing device of the present invention connected to the tensile test head.

[0022] Figure 2 This is a schematic diagram of the tape method test head of the present invention.

[0023] Figure 3 This is a schematic diagram of the tensile test head of the present invention.

[0024] In the picture: 1. Base; 2. Fine-tuning knob; 3. Working platform; 4. Sample; 5. Clamping bracket; 6. Fixing bolt; 7. Column; 8. Crossbeam; 9. Servo motor; 10. Longitudinal tension rod; 11. Pressure sensor; 12. Displacement sensor; 13. Chain; 14. Tensile test head; 15. Integrated control cabinet; 16. Bearing; 17. Test head bracket; 18. Anti-loosening nut; 19. Adhesive tape; 20. Resistance wire; 21. Temperature sensor. Detailed Implementation

[0025] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0026] The specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "linked" should be interpreted broadly; for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] like Figures 1 to 3 As shown, the present invention provides a multifunctional zinc coating adhesion testing device, comprising: The test platform includes a work platform 3 for supporting a sample with a galvanized layer and a clamping mechanism for adjusting and fixing the sample. The power system includes a servo motor 9, with a longitudinal tension rod 10 connected to the servo motor 9. The servo motor 9 can drive the longitudinal tension rod 10 to rise and fall and can also drive the longitudinal tension rod 10 to move in the horizontal direction. The replaceable test head assembly includes a tape test head for qualitative analysis of zinc coating adhesion and a tensile test head 14 for quantitative analysis of zinc coating adhesion, with the tape test head or the tensile test head 14 detachably connected to the longitudinal tensile rod 10. The detection system includes a pressure sensor 11 for real-time monitoring of changes in the tensile force of the longitudinal tension rod, a displacement sensor 12 for real-time monitoring of changes in the displacement of the longitudinal tension rod 10, and a temperature sensor 21 for real-time detection of the temperature of the tensile test head 14. The control system, power system, replaceable test head assembly, and detection system are all electrically connected to the control system.

[0029] In the multifunctional zinc coating adhesion testing device of the present invention, the replaceable test head assembly includes a tape method test head and a tensile method test head, which can be selected to achieve rapid switching between qualitative and quantitative testing functions; the adjustable clamping mechanism can be adapted to various thicknesses of steel plates, angle steel, H-beams and other samples of different grades / specifications, solving the problem of narrow application scenarios of existing devices; the detection system provides a guarantee for accurate acquisition of test data.

[0030] This invention can achieve qualitative and quantitative analysis of various types of adhesion, realize efficient and accurate testing of galvanized layer adhesion, and solve the technical problems of existing devices having narrow application scenarios, poor data reliability, and high operational intensity.

[0031] Furthermore, such as Figure 2 As shown, the tape method test head includes tape 19, bearing 16, and test head support 17. The test head support 17 is detachably connected to the longitudinal tension rod 10. The tape 19 has a gradient viscosity and is arranged in a roll. The tape 19 is rotatably connected to the test head support 17 via bearing 16. Bearing 16 can be a ball bearing.

[0032] Furthermore, such as Figure 1 , Figure 2 As shown, a threaded section is provided in the middle of the longitudinal tension rod 10, and a threaded connection hole is provided on the test head bracket 17. The test head bracket 17 is sleeved and connected to the threaded section through the threaded connection hole to ensure tight thread engagement and avoid loosening during the test.

[0033] An anti-loosening nut 18 is installed above the threaded section of the test head bracket 17 to prevent displacement and deflection of the test head bracket 17 during the test, effectively controlling errors and improving test accuracy.

[0034] The positions of the test head bracket 17 and the anti-loosening nut 18 can be adjusted up and down on the threaded section to accommodate specimens of different heights or test conditions.

[0035] In one specific embodiment, the adhesive tape 19 has a gradient viscosity, and there are two tapes 19, symmetrically arranged on both sides of the longitudinal tension rod 10. The two rolls of tape 19 have a total of six viscosities. The tape 19 uses acrylic pressure-sensitive adhesive, and different viscosities are achieved by changing the amount of the core components (the proportion of soft monomers decreases from 92% to 68% in stages, the proportion of hard monomers increases to 30% in stages, and the proportion of functional monomers remains constant). Specifically, the tape 19 is prepared by adjusting the amount of soft monomers (92%-68%) and hard monomers (2%-30%) (the proportion of functional monomers is fixed), corresponding to adhesion grades of 3.0–4.1 N / 25 mm, 4.5–5.5 N / 25 mm, 6.0–7.0 N / 25 mm, 7.5–8.5 N / 25 mm, 9.0–10.0 N / 25 mm, and 10.5–11.5 N / 25 mm, providing a core component for the qualitative grading of the adhesion of the galvanized layer.

[0036] Furthermore, such as Figure 3 As shown, the tensile test head 14 is detachably connected to the bottom of the longitudinal tensile rod 10. The tensile test head 14 is equipped with a resistance wire 20 and a temperature sensor 21. The temperature sensor 21 detects the real-time temperature of the test head inside the tensile test head 14. The built-in resistance wire 20 can work with the temperature sensor 21 to realize the heating function. In the adhesive curing process, the curing time is shortened by heating (for example, epoxy structural adhesives can be shortened from the conventional room temperature curing time of 8 hours to 60°C heating curing time of 2 hours), which significantly improves the testing efficiency.

[0037] The bottom of the longitudinal tension rod 10 is provided with an internal threaded groove, and the tension test head 14 is provided with a threaded protrusion. The threaded protrusion can be detachably connected to the internal threaded groove, which enables quick assembly and disassembly of the test head.

[0038] Furthermore, such as Figure 1As shown, the working platform 3 is provided with a platform connection threaded hole; the working platform 3 is supported on the base 1, and the base 1 includes a threaded columnar rod with an anti-slip bottom. The columnar rod passes through and connects to the platform connection threaded hole. A fine-tuning knob 2 is provided below the columnar rod on the working platform 3. The fine-tuning knob 2 is used to rotate and adjust the level of the working platform 3 so that the zinc plating layer of the sample 4 is in a horizontal state. To facilitate the evaluation of the levelness, a level can be installed on the working platform 3.

[0039] The test platform adopts a base structure of "anti-slip base + threaded column rod + adjustable nut (fine adjustment knob 2)". The work platform 3 passes through the column rod of the base and presses on the adjustable nut (fine adjustment knob 2). By rotating the adjustable nut (fine adjustment knob 2), the level of the work platform can be finely adjusted (error ≤0.1mm / m).

[0040] Furthermore, such as Figure 1 As shown, at least two columns 7 are set on the work platform 3, and a crossbeam 8 is set between the two columns 7. A chain 13 is set on the crossbeam 8. A servo motor 9 is connected to the chain 13, and a longitudinal tension rod 10 is connected to the chain 13. The servo motor 9 drives the chain 13 to move the longitudinal tension rod 10 horizontally.

[0041] Furthermore, such as Figure 1 As shown, the clamping mechanism includes a clamping bracket 5 and a fixing bolt 6. The clamping bracket 5 is mounted on the working platform 3, and the fixing bolt 6 is adjustablely connected to the clamping bracket 5. One end of the fixing bolt 6 can press against and clamp the sample 4. The clamping mechanism adopts a combination of "bracket + fixing bolt", which can adapt to various thicknesses of steel plates, angle steel, H-beams and other samples of different grades / specifications, solving the problem of the narrow application scenarios of existing devices.

[0042] Furthermore, a pressure sensor 11 is positioned at the top of the longitudinal tension rod 10 to monitor changes in the tension of the longitudinal tension rod 10 in real time. A displacement sensor 12 is fixed above the servo motor 9 and can contact the longitudinal tension rod 10 to monitor changes in the displacement of the longitudinal tension rod 10 in real time.

[0043] Furthermore, such as Figure 1 As shown, the control system includes an integrated control cabinet 15, which is equipped with an interactive touch screen. The control system collects the tension data of the pressure sensor 11 and the displacement data of the tension rod of the displacement sensor 12 in real time through the integrated control cabinet 15, automatically plots the real-time tension-displacement curve, records the maximum tension value, and automatically calculates the adhesion force (adhesion force = maximum tension / adhesion area) according to the preset force area (e.g., 314mm² for a 20mm diameter connector), thus avoiding errors from manual calculation.

[0044] The present invention also provides a multifunctional zinc coating adhesion test method, which is implemented using the multifunctional zinc coating adhesion test device of the present invention; including: placing the sample 4 with the zinc coating flat and fixing it on the working platform 3; connecting the tape test head to the longitudinal tensile rod 10 to perform qualitative analysis of the zinc coating adhesion, or connecting the tensile test head 14 to the longitudinal tensile rod 10 to perform quantitative analysis of the zinc coating adhesion.

[0045] Furthermore, the qualitative analysis of the adhesion of the galvanized layer includes the following steps: Step S01: Pre-treat the surface of the sample 4 with the zinc coating; specifically, clean the surface of the sample 4 to remove oil, dust and other impurities.

[0046] The pretreated sample 4 is placed on the working platform 3 and fixed by the clamping mechanism; observe the level (level bubble meter) on the working platform 3, and adjust the working platform 3 by the fine adjustment knob 2 until the bubble is centered to ensure that the surface of the sample 4 is in a horizontal state.

[0047] Step S02: Connect the tape method test head to the longitudinal tensile rod 10. Specifically, the test head bracket 17 is threadedly connected to the middle (threaded section) of the longitudinal tensile rod 10, ensuring a tight thread engagement to prevent loosening during testing. Simultaneously, depending on testing requirements, the positions of the test head bracket 17 and the anti-loosening nut 18 can be adjusted up and down in the threaded section of the middle of the longitudinal tensile rod 10 to accommodate samples of different heights or testing conditions.

[0048] To initially determine the adhesion of the galvanized layer, select tape 19 with an appropriate viscosity. If the adhesion is uncertain, use both tapes simultaneously. Rotate tape 19 so that the part with the lowest viscosity is facing the sample 4 to be tested.

[0049] Step S03: Set the pressing pressure, moving speed, and moving distance of the tape 19 via the touch screen of the control system. The pressing pressure and moving speed ensure that the tape 19 fully adheres to the galvanized layer and reduces testing errors, while the moving distance ensures coverage of all viscosity gradients.

[0050] Step S04: Start the test. Servo motor 9 drives the longitudinal tension rod 10 to descend at a constant speed. The tape 19 of the tape method test head descends synchronously. The bottom of the tape 19 contacts the galvanized layer surface of the sample 4. After reaching the preset pressure, the longitudinal tension rod 10 stops pressing down, and the tape 19 adheres to the galvanized layer. After the pressure is maintained for a set time, servo motor 9 drives chain 13 to move at a preset speed. The longitudinal tension rod 10 drives the tape 19 to move and unfold to cover the test area of ​​the sample. After moving a set distance, servo motor 9 stops. Step S05: Remove the sample and observe the state of the galvanized layer after bonding with tapes of different viscosities in the test area to make a qualitative judgment on the adhesion level.

[0051] During the qualitative test of the adhesive tape, the pressing pressure, moving speed and moving distance of the tape are set through the touch screen. The servo motor 9 drives the longitudinal tension rod 10 to press down at a constant speed to the preset pressure, and then drives the chain 13 to move along the crossbeam 8 at a preset speed. By combining the proportion of the zinc coating peeling area (<10%, 10%-20%, >20%) with the corresponding relationship between the grade of the gradient viscosity tape, the adhesion grade can be accurately determined.

[0052] Specifically, after the test is stopped, the adhesion of the galvanized layer is qualitatively analyzed by referring to the corresponding standard rating table. If there is no peeling or flaking on the surface of the galvanized layer, and the galvanized layer around the cut is still tightly adhered to the substrate, according to the correspondence of the tape method test according to this invention, the adhesion level can be determined to be the level of the corresponding high-viscosity tape. If a small amount of galvanized layer peels off from the cut or the edge of the grid, but the peeling area accounts for a small proportion of the entire test area, such as less than 10%, then according to the peeling situation and combined with the adhesion range corresponding to different viscosity tapes, the adhesion level may be reduced by one level. For example, if a small amount of peeling occurs in the range of 9.0 to 10.0 N / 25 mm, it may be determined to be the level of 7.5 to 8.5 N / 25 mm. If the peeling area of ​​the galvanized layer is large, exceeding 20%, or even large areas peel off in patches, then the adhesion level corresponds to the level of a lower viscosity tape, indicating that the adhesion of the galvanized layer is poor, such as being determined to be the level of 3.0 to 4.1 N / 25 mm. A comprehensive assessment of multiple regions is conducted to perform a qualitative analysis of the adhesion of the galvanized layer and determine its adhesion level.

[0053] By adjusting the pressure applied to the sample using a fixed adhesive tape test head and the speed at which the test head moves, human error can be reduced. Using adhesive tapes with gradient viscosities can further reduce testing errors, determine the range of adhesion strength, and enable qualitative analysis of the adhesion.

[0054] Furthermore, the quantitative analysis of the adhesion of the zinc coating includes the following steps: Step S01: Pre-treat the surface of the sample 4 with the zinc coating; specifically, clean the surface of the sample 4 to remove oil, dust and other impurities.

[0055] The pretreated sample 4 is placed on the working platform 3 and fixed by the clamping mechanism; observe the level (level bubble meter) on the working platform 3, and adjust the working platform 3 by the fine adjustment knob 2 until the bubble is centered to ensure that the surface of the sample 4 is in a horizontal state, so as to ensure that the tensile force direction of the subsequent tensile test head is perpendicular to the surface of the sample 4.

[0056] The test area of ​​the zinc plating layer is coated with an adhesive; specifically, a suitable adhesive (such as epoxy resin or acrylic adhesive) is selected according to the type of coating layer and applied to the test area of ​​the sample.

[0057] Step S02: Connect the tensile test head 14 to the longitudinal tensile rod 10; In the tensile test, the coaxiality of the tensile test head 14 and the longitudinal tensile rod 10 is calibrated (error ≤ 0.2 mm), and the servo motor 9 drives the longitudinal tensile rod 10 at a uniform speed (speed error ≤ ± 0.05 mm / min) to ensure that the tensile force direction is perpendicular to the sample surface and improve the reliability of the data.

[0058] Step S03: Set the test parameters via the touch screen of the control system, including curing temperature, curing time (curing time is determined according to the type of adhesive), tensile movement speed (selected according to the toughness of the coating layer; lower speed, such as 0.5-1 mm / min, is selected for brittle coating layers; higher speed, such as 2-5 mm / min, is selected for tough coating layers), force-bearing area of ​​the sample (determined according to the contact area of ​​the joint, usually circular with a diameter of 10-50 mm), and test termination condition (automatically stops when the tensile force drops to 50% of the maximum tensile force).

[0059] During the quantitative tensile test, the tensile force movement speed is set according to the toughness classification of the galvanized layer. For brittle coatings, the speed is 0.5–1 mm / min, and for tough coatings, it is 2–5 mm / min. The test termination condition is set to "the tensile force value drops to 50% of the maximum tensile force" to ensure the accuracy of the quantitative test data.

[0060] Step S04: Start the servo motor 9 to drive the longitudinal tension rod 10 to descend so that the tensile test head contacts the adhesive. Start the test, heat the resistance wire 20 inside the tensile test head and keep it at a set temperature for a set time. After the adhesive has cured, the servo motor 9 drives the longitudinal tensile rod 10 to move upward and apply vertical tension until the galvanized layer separates from the steel plate substrate of the sample. Record the tensile stress and displacement. During the test, the control system collects the force data measured by the pressure sensor 11 and the displacement data of the longitudinal tension rod 10 measured by the displacement sensor 12 in real time, and plots the real-time tension-displacement curve on the touch screen; when the cover layer separates from the substrate, the maximum tension value at this time is recorded.

[0061] Step S05: Calculate the adhesion to complete the quantitative analysis of the adhesion of the galvanized layer.

[0062] Based on the test process data, the control system automatically calculates the adhesion force value according to the preset force-bearing area (adhesion force = maximum tensile force / force-bearing area, unit is MPa or N / mm²).

[0063] After the test automatically stops, the touch screen displays the test results (including maximum tensile force, adhesion force, and separation pattern); the data storage module automatically saves the test data, which can be exported via USB or the test report can be printed directly; the sample is disassembled, the test platform and tensile test head 14 are cleaned, and preparation is made for the next test.

[0064] The quantitative analysis process records the changes in tensile force during the stretching process and automatically calculates the adhesion force value by combining it with the preset force-bearing area, thus realizing the quantitative analysis of adhesion force.

[0065] Example 1: The quantitative analysis of the adhesion test of the galvanized layer on Q355B steel follows these steps: Step 1: Clean the surface of the galvanized layer of the steel (i.e., the galvanized layer of sample 4) to remove oil, dust, and other impurities. Based on the bonding characteristics between the galvanized layer of the steel plate and the substrate, select an epoxy structural adhesive (model E-44, curing agent ethylenediamine, mass ratio 10:1).

[0066] Step 2: Place the pretreated steel in the clamping mechanism of the testing platform, and adjust the fixing bolts 6 of the clamping mechanism to fix the sample 4. Observe the horizontal bubble meter, and adjust the working platform 3 by adjusting the fine adjustment knob 2 until the bubble is centered, ensuring that the surface of the sample 4 is in a horizontal state, and ensuring that the tensile force direction of the subsequent longitudinal tensile rod 10 is perpendicular to the surface of the sample 4.

[0067] Step 3: Using a scraper (existing technology), evenly apply the well-mixed adhesive to the center of the galvanized layer to be tested, controlling the coating thickness to 0.8-1.2mm. The coating area should be consistent with the bottom surface area of ​​the tensile test head 14, ensuring no air bubbles or missed areas. The servo motor 9 drives the longitudinal tensile rod 10 downward to ensure close contact between the tensile test head and the adhesive.

[0068] Step 4: Set the curing temperature to 60℃, curing time to 2 hours, tensile speed to 0.5 mm / min, and force-bearing area to 314 mm² via the control system's touchscreen. 2 (Connector diameter 20mm) The test will automatically stop when the tensile force drops to 50% of the maximum tensile force.

[0069] Step 5: Start the test. Heate the resistance wire 20 and keep it at that temperature for 2 hours. After the adhesive has cured, the servo motor 9 drives the longitudinal tension rod 10 to move upward at a uniform speed, and the tensile stress is recorded. When the galvanized layer separates from the steel plate substrate, the tensile force value will drop significantly. The control system automatically records the maximum tensile force of 850N at this time. The device control system stores this data in real time and marks the displacement point corresponding to the maximum tensile force on the curve.

[0070] Step 6: The control system automatically calculates the adhesion value according to the preset force area (314mm²) and the recorded maximum tensile force value, using the formula "Adhesion = Maximum Tensile Force / Force Area"; the calculated adhesion is 2.71MPa, with the calculation result accurate to 0.01MPa.

[0071] Step 7: Turn off the power to the testing device, loosen the fixing bolts 6 of the clamping mechanism, and remove the tested sample 4 (at this time, the tensile test head 14 has separated from the galvanized layer); use a special tool (such as a wrench) to remove the tensile test head 14 at the bottom of the longitudinal tensile rod 10, and clean the adhesive and galvanized layer debris remaining on the bottom surface of the tensile test head 14 with anhydrous ethanol; at the same time, wipe the work platform 3 and the clamping mechanism with a lint-free cloth to remove any possible residual impurities and prepare for the next test.

[0072] Example 2: The qualitative analysis of the adhesion test of the galvanized layer on Q355B steel samples follows these steps: Step 1: Clean the surface of the galvanized steel layer to remove oil, dust, and other impurities. After cleaning, place sample 4 in a constant temperature and humidity environment of 23℃±2℃ and 50%±5% relative humidity for 20 minutes to ensure that the anhydrous ethanol on the test area surface has completely evaporated, avoiding residual liquid from affecting the adhesion between the tape and the galvanized layer.

[0073] Step 2: Place the pretreated steel sample in the clamping mechanism of the testing platform and adjust the clamping mechanism to fix the sample 4. Observe the horizontal bubble meter and adjust the working platform 3 by adjusting the fine adjustment knob 2 until the bubble is centered, ensuring that the surface of the sample 4 is in a horizontal state, and the direction of the tension of the subsequent longitudinal tension rod 10 is perpendicular to the sample surface.

[0074] Step 3: Based on the height of the test area of ​​sample 4 (total sample thickness 5mm, distance from the test platform reference surface to the galvanized layer surface is 5mm), adjust the position of the test head bracket 17 up and down along the threaded section in the middle of the longitudinal tension rod 10 so that the distance between the bottom of the tape roll and the galvanized layer surface of the sample is controlled at 8mm. After adjustment, adjust the position of the anti-loosening nut 18 to prevent the test head bracket 17 from shifting or deflecting during the test. Step 4: Manually rotate the tape roll to check if the ball bearing rotates smoothly, ensuring that tape 19 can be released at a uniform speed with the ball bearing without any jamming. At the same time, confirm the orientation of the label on the gradient viscosity tape, so that the starting end of "Viscosity 3.0~4.1N / 25mm" (minimum viscosity) is aligned with the edge of the test area of ​​the sample to be tested.

[0075] Step 5: Select and enable "Full Viscosity Gradient Test Mode" and use the 6 viscosity gradients on the tape roll (3.0~4.1N / 25mm, 4.5~5.5N / 25mm, 6.0~7.0N / 25mm, 7.5~8.5N / 25mm, 9.0~10.0N / 25mm, 10.5~11.5N / 25mm).

[0076] Step 6: Set the tape pressing pressure to 8N, tape moving speed to 2mm / s, and moving distance to 80mm via the control system's touchscreen to ensure that the tapes of all six viscosity gradients can fully contact the test area.

[0077] Step 7: Start the test. Servo motor 9 starts and drives the longitudinal tension rod 10 to move downward at a constant speed. The tape roll descends with the longitudinal tension rod 10. When the bottom of the tape 19 contacts the surface of the zinc plating layer of the sample, the pressure sensor 11 monitors the pressure value in real time until the pressure reaches the preset 8N. Servo motor 9 stops pressing down and maintains the pressure for 5s to ensure that the tape 19 is fully bonded to the zinc plating layer.

[0078] Step 8: After the pressure holding time ends, the servo motor 9 drives the chain 13 to move laterally along the crossbeam 8 at a preset speed of 2mm / s. The tape roll moves with the chain 13, and at the same time, the ball bearing rotates at a constant speed to release the tape, so that the tapes of 6 different viscosity gradients cover the sample test area in sequence. During the movement, the device displays the moving distance in real time. When the moving distance reaches 80mm, the servo motor stops automatically, and the test ends.

[0079] Step Nine: After the test is stopped, remove sample 4 and observe the state of the galvanized layer after bonding with tapes of different viscosities in the test area, and make an evaluation: Area covered by tape with viscosity of 10.5~11.5N / 25mm: There is no peeling or flaking on the surface of the galvanized layer. Around the cut (a 1mm deep grid cut is made at the edge of the test area beforehand with a scriber), the galvanized layer is tightly attached to the substrate without any peeling marks; Area covered by tape with viscosity of 9.0~10.0N / 25mm: Only a very small amount of galvanized layer peels off at the corner of the grid cut, and the peeling area is about 3% (less than 10%) of the total area of ​​the area; Area covered by tape with viscosity of 7.5~8.5N / 25mm and below: There is no obvious peeling of the galvanized layer, and only slight tape bonding marks are present.

[0080] Step 10: Based on the observation results of multiple areas, a comprehensive judgment is made: since there is no peeling in the high viscosity (10.5~11.5N / 25mm) tape area and the peeling area in the second highest viscosity (9.0~10.0N / 25mm) area is less than 10%, according to the corresponding relationship of the tape method test according to the present invention, the adhesion level of the galvanized layer of the Q355 steel plate is determined to be 9.0~10.0N / 25mm.

[0081] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A multifunctional zinc coating adhesion testing device, characterized in that, include: The testing platform includes a work platform for supporting a sample with a galvanized coating and a clamping mechanism for adjusting and fixing the sample. The power system includes a servo motor, on which a longitudinal tension rod is connected. The servo motor can drive the longitudinal tension rod to rise and fall and can also drive the longitudinal tension rod to move in the horizontal direction. A replaceable test head assembly includes a tape test head for qualitative analysis of zinc coating adhesion and a tensile test head for quantitative analysis of zinc coating adhesion, wherein the tape test head or the tensile test head is detachably connected to the longitudinal tensile rod. The detection system includes a pressure sensor for real-time monitoring of the tensile force change of the longitudinal tension rod, a displacement sensor for real-time monitoring of the displacement change of the longitudinal tension rod, and a temperature sensor for real-time detection of the temperature of the tensile test head. The control system, the power system, the replaceable test head assembly, and the detection system are all electrically connected to the control system.

2. The multifunctional zinc coating adhesion testing device as described in claim 1, characterized in that, The tape test head includes a tape, a bearing, and a test head bracket. The test head bracket is detachably connected to the longitudinal tension rod. The tape has a gradient viscosity and is arranged in a roll. The tape is rotatably connected to the test head bracket through the bearing.

3. The multifunctional zinc coating adhesion testing device as described in claim 2, characterized in that, The longitudinal tension rod has a threaded section in the middle, and the test head bracket has a threaded connection hole. The test head bracket is sleeved and connected to the threaded section through the threaded connection hole, and an anti-loosening nut is provided above the threaded section.

4. The multifunctional zinc coating adhesion testing device as described in claim 1, characterized in that, The tensile test head is detachably connected to the bottom of the longitudinal tensile rod, and the tensile test head is provided with a resistance wire and the temperature sensor; the bottom of the longitudinal tensile rod is provided with an internal threaded groove, and the tensile test head is provided with a threaded protrusion, which is detachably connected to the internal threaded groove.

5. The multifunctional zinc coating adhesion testing device as described in claim 1, characterized in that, The working platform is provided with a platform connection threaded hole; the working platform is supported on a base, the base includes a threaded column rod, the bottom of the column rod is provided with an anti-slip bottom, the column rod passes through and is connected to the platform connection threaded hole, and a fine adjustment knob is provided at the position of the column rod below the working platform, the fine adjustment knob is used to rotate and adjust the level of the working platform so that the zinc plating layer of the sample is in a horizontal state.

6. The multifunctional zinc coating adhesion testing device as described in claim 5, characterized in that, At least two columns are provided on the working platform, and a crossbeam is provided between the two columns. A chain is provided on the crossbeam, a servo motor is connected to the chain, and a longitudinal tension rod is connected to the chain. The servo motor drives the chain to move the longitudinal tension rod horizontally.

7. The multifunctional zinc coating adhesion testing device as described in claim 1, characterized in that, The clamping mechanism includes a clamping bracket and a fixing bolt. The clamping bracket is disposed on the working platform, and the fixing bolt is adjustablely connected to the clamping bracket. One end of the fixing bolt can press against and clamp the sample.

8. A multifunctional method for testing the adhesion of galvanized layers, characterized in that, The experiment is carried out using the multifunctional zinc coating adhesion testing device according to any one of claims 1 to 7; including: placing the sample with the zinc coating flat and fixing it on the work platform; connecting the tape method test head to the longitudinal tensile rod to perform qualitative analysis of the zinc coating adhesion, or connecting the tensile method test head to the longitudinal tensile rod to perform quantitative analysis of the zinc coating adhesion.

9. The multifunctional zinc coating adhesion test method as described in claim 8, characterized in that, Qualitative analysis of the adhesion of galvanized coatings includes the following steps: The surface of the sample with the zinc coating is pretreated; the pretreated sample is placed on the work platform and fixed by the clamping mechanism. Connect the tape test head to the longitudinal tension bar; set the tape's downward pressure, moving speed, and moving distance through the control system; When the test is started, the servo motor drives the longitudinal tension rod to descend, and the tape of the tape test head descends synchronously. The bottom of the tape contacts the galvanized layer surface of the sample. After the preset pressure is reached, the longitudinal tension rod stops pressing down, and the tape adheres to the galvanized layer. After the pressure is maintained for a set time, the servo motor drives the chain to move at a preset speed. The longitudinal tension rod moves the tape to expand and cover the test area of ​​the sample. After moving a set distance, the servo motor stops. Remove the sample and observe the state of the galvanized layer after bonding with tapes of different viscosities in the test area to make a qualitative judgment on the adhesion level.

10. The multifunctional zinc coating adhesion testing method as described in claim 8, characterized in that, The quantitative analysis of zinc coating adhesion includes the following steps: The surface of the sample with the galvanized layer is pretreated; the pretreated sample is placed on the work platform and fixed by the clamping mechanism; the test area of ​​the galvanized layer is coated with adhesive; Connect the tensile test head to the longitudinal tensile rod; Test parameters, including curing temperature, curing time, and tensile movement speed, are set through the control system. Start the servo motor to drive the longitudinal tension rod down so that the tensile test head contacts the adhesive. The test is started. The resistance wire inside the tensile test head is heated and kept at a set temperature for a set time. After the adhesive cures, the servo motor drives the longitudinal tensile rod to move upward until the galvanized layer separates from the steel plate substrate of the sample. The tensile stress and displacement are recorded. Calculate the adhesion force to complete the quantitative analysis of the adhesion force of the galvanized layer.

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