System and method for evaluating service life of coating material

Abstract

The invention belongs to the technical field of aging experiments, and particularly relates to a coating material service life evaluation system and method. The device comprises an experiment box body and a control module, the experiment box body is divided into a first chamber and a second chamber through a partition plate, and the first chamber integrates a temperature, humidity, acid-base and flow rate control unit and rotating blades and is used for premixing to form a stable environment medium; the second chamber is provided with an ultraviolet generating device, an alternating load applying device and an adjusting clamp and is used for adjusting the position of the sample. According to the method, experimental parameters are set through the control module, all the units are driven to work, experimental data are collected, the accelerated aging time is recorded after a sample fails, and the service life of the coating in the actual service environment is calculated in combination with acceleration factors corresponding to the temperature, the humidity, the pH value, the ultraviolet light, the air velocity and the alternating load. The method realizes multi-environmental factor decoupling, ensures that parameters stably and uniformly act on the sample, improves the reliability of aging data, and provides an accurate basis for coating life evaluation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aging experiments, and particularly relates to a coating material service life evaluation system and method. BACKGROUND

[0002] With the progress of science and technology, coating technology is widely used in modern chemical production and manufacturing industry. Coating material service life detection technology is an important means to ensure the long-term performance and safety of coating products.

[0003] In order to ensure the reliability of coating materials, the industry usually uses natural environment long-term experiment method to evaluate the performance of coating materials. For coating material life prediction, some technical solutions try to simulate coating material failure simulation by accelerating aging experiment device. A part of the aging experiment device has only single function, and can only simulate single environmental conditions one by one in the process of coating material aging experiment, which cannot meet the complex conditions of real use scene. Another part of the aging experiment device simply superimposes and integrates multiple functions, such as Chinese invention patent CN109115674B accelerated aging experiment box, which discloses an accelerated aging box, a sample bearing table track, a temperature control unit, a humidity control unit, a light control unit and a fluid supply unit, but does not solve the problem of the synergistic effect and mutual interference of multiple environmental factors: first, different factors are coupled in the box, forming a chaotic state without rules, which cannot accurately control single environmental parameters, for example, changing the flow rate will disturb the temperature, changing the flow will make the acid-base value fluctuate, etc. Second, the distribution of environmental parameters in the box is uneven, so that the adjusted environmental parameters cannot uniformly act on the sample surface. This makes the parameters actually acting on the sample fluctuate with the set output parameters, resulting in that the aging data lacks accuracy and representativeness, and can only prove that the coating material is aging, but it is difficult to reflect the failure law of the coating material in the real complex scene, and cannot provide reliable basis for the service life evaluation of the coating material. SUMMARY

[0004] The application aims to provide a coating material service life evaluation system and method to solve the problem that the simple superposition of multiple environmental factors of the existing device causes parameter interference and uneven distribution, and cannot accurately evaluate the service life of the coating material.

[0005] In order to achieve the above purpose, one aspect of the application provides a scheme, which is a coating material service life evaluation system, comprising: The experiment box body comprises a partition plate, the partition plate divides the inside of the experiment box body into a first chamber and a second chamber, a air duct inlet is arranged between the first chamber and the second chamber, a air duct outlet is arranged on the experiment box body and opposite to the air duct inlet, and a pressure stabilizing valve is arranged on the experiment box body. The first chamber is provided with a temperature control unit, a humidity control unit, an acid-base control unit, a flow rate control unit and a rotating blade. The second chamber is equipped with an ultraviolet generator, an alternating load application device, and an adjustment clamp. The adjustment clamp is located at the bottom of the second chamber for holding the experimental sample. The adjustment clamp is located between the air duct inlet and the air duct outlet, and the adjustment clamp can adjust the position of the experimental sample on the X, Y, and Z axes. The control module is electrically connected to the temperature control unit, humidity control unit, acid-base control unit, flow rate control unit, ultraviolet generator, and alternating load application device.

[0006] The working principle and beneficial effects of this scheme are as follows: The control module sends regulation signals to each functional unit according to preset experimental parameters, driving the temperature control unit, humidity control unit, or acid-base control unit in the first chamber to adjust the temperature, humidity, and acid-base concentration inside the chamber, respectively. The flow rate control unit starts and outputs airflow at the set flow rate. The airflow drives the rotating blades in the first chamber to rotate at high speed. The rotating blades thoroughly stir the gas with adjusted parameters in the chamber, so that the parameters such as temperature, humidity, and acid-base concentration are uniformly distributed in the first chamber. During this process, the pressure regulating valve on the experimental chamber body monitors the gas pressure inside the chamber in real time. If there is too much gas inside the chamber and the gas pressure rises due to gas regulation or sealing environment, the pressure regulating valve automatically opens to release pressure, ensuring that the gas pressure inside the chamber is maintained within a stable range and avoiding interference from pressure fluctuations on the accuracy of environmental parameters.

[0007] The uniform ambient gas in the first chamber flows directionally into the second chamber through the air duct inlet on the partition and exits from the air duct outlet opposite to the inlet, forming a stable airflow path. Simultaneously, the control module drives the ultraviolet generator to output ultraviolet light of a set intensity, and drives the alternating load application device to apply a mechanical load of a preset frequency and amplitude to the experimental sample according to experimental requirements. The position of the clamps is adjusted along the X, Y, and Z axes to place the experimental sample in the optimal experimental position, enabling coating aging experiments under the synergistic effect of multiple factors. The air duct outlet and inlet work together to form a stable airflow path. This device, through its dual-chamber partition layout, airflow premixing, optimized clamp and test sample positions, and directional airflow path planning, achieves decoupling of the entire experimental environment through ingenious structural design. With each functional unit uniformly controlled by the control module, the parameters of the overall environmental medium in the second chamber are maintained stably, achieving effective decoupling between parameters and preventing mutual weakening or abnormal superposition of different parameters during operation. This ensures that every aging factor acting on the experimental sample meets preset standards and is stable and controllable, resulting in reliable aging data and accurate lifetime assessment.

[0008] (1) Through the first chamber, the temperature, humidity, acid-base medium is premixed, so that the environmental factors form a stable combination state with determined parameters before acting on the sample, and then flow into the second chamber to cooperate with ultraviolet rays and alternating loads. Through the partition, the decoupling effect is ensured, and multiple experimental factors are integrated. Without additional device, the experimental deviation problem caused by simple coupling of multiple factors is solved, and the accuracy and reliability of the experimental results of life evaluation are improved; (2) The integrated temperature, humidity, acid-base corrosion, ultraviolet aging, alternating mechanical load and other influencing factors comprehensively cover the complex environment and mechanical action that the coating material faces in actual use, which is more suitable for practical application scenarios than single function or simple superposition of aging devices; (3) The X, Y and Z axis three-dimensional position adjustment function of the adjusting clamp can adjust the spatial attitude of the experimental sample, avoiding the experimental data dispersion caused by uneven local experimental action.

[0009] Optionally, the adjusting clamp comprises a cubic frame track and a plurality of clamping blocks. The four long X-axis tracks, the four wide Y-axis tracks and the four high Z-axis tracks of the cubic frame track, the clamping blocks are slidably connected to the Y-axis tracks, the Y-axis tracks are slidably connected to the X-axis tracks and fixed by first fastening bolts, and the X-axis tracks are slidably connected to the Z-axis tracks and fixed by second fastening bolts. The cubic frame track supports the position fine adjustment of the experimental sample in three-dimensional space, ensures that the surface of the sample is aligned with the ultraviolet irradiation area, the alternating load action direction or the flow path of the comprehensive environmental medium, and solves the problem of single experimental area caused by the fixed position of the traditional clamp.

[0010] Optionally, the clamping block comprises one or more of a plate clamping surface, a columnar body clamping surface, a cubic clamping groove and a spherical clamping surface. For the common carrier form of coating materials, different clamping surfaces can provide targeted clamping schemes. Through different clamping schemes, the contact area between the clamping block and the experimental sample is minimized, the influence of electrochemical reaction at the contact surface on life evaluation is minimized, and the influence of the adjusting clamp on the airflow on the surface of the experimental sample is also minimized, which is conducive to maintaining the stability of the single parameter control of the airflow on the surface of the experimental sample, thereby further increasing the accuracy of life evaluation.

[0011] Optionally, the clamping block further comprises a sliding seat, the clamping block is rotatably connected to the sliding seat and magnetically connected to the sliding seat, and the sliding seat is slidably connected to the Y-axis track. The rotation process does not require tool assistance, and the fixed angle is maintained by magnetic force, which ensures the stability of the sample attitude during the experiment and can quickly switch the clamping angle.

[0012] Optionally, the flow rate control unit comprises a fan and an air speed meter, the fan is arranged on the side wall of the first chamber, and the air speed meter is arranged on the side wall of the second chamber.

[0013] Optionally, the temperature control unit comprises a heating sheet and a temperature sensor, the heating sheet is arranged inside the fan, and the temperature sensor is arranged on the side wall of the second chamber through the flexible wire.

[0014] Optionally, the humidity control unit comprises a dry air inlet, a wet air inlet and a humidity sensor, the dry air inlet and the wet air inlet are arranged on the side wall of the first chamber, and the humidity sensor is arranged on the side wall of the second chamber through the flexible wire.

[0015] Optionally, the acid-base control unit comprises an acidic air inlet, an alkaline air inlet and a pH sensor, the acidic air inlet and the alkaline air inlet are arranged on the side wall of the first chamber, and the pH sensor is arranged on the side wall of the second chamber through the flexible wire.

[0016] Optionally, the alternating load applying device comprises an electromagnetic exciter and a strain gauge, the electromagnetic exciter is fixed in the second chamber, and the strain gauge is arranged on the side wall of the second chamber through the flexible wire.

[0017] Another aspect of the present application provides a scheme, which is a coating material life evaluation method, comprising the following steps: Step S1: The experimental sample is clamped and fixed by the clamp block, the position of the experimental sample in the three-dimensional space is fine-tuned by the cubic frame track, and the temperature sensor, the humidity sensor, the pH sensor and the strain gauge are arranged in the second chamber close to the experimental sample through the flexible wire; Step S2: The preset experimental parameters are input through the control module, the control module drives the temperature control unit, the humidity control unit, the acid-base control unit, the flow rate control unit, the rotating blade, the ultraviolet light generating device and the alternating load applying device to work, and the control module receives the detection data of the temperature sensor, the humidity sensor, the pH sensor, the air speed meter and the strain gauge during the experiment; Step S3: After the sample appears the failure condition, the time L1 of the accelerated aging experiment is recorded, and the control module closes the ultraviolet light generating device, the alternating load applying device, the rotating blade, the temperature, the humidity or the acid-base control unit; Step S4: The experimental data collected in step S2 are sorted out, the life of the coating material in the actual service environment is calculated according to the principle of accelerated aging experiment and in combination with the acceleration factor; Step S4.1: The temperature acceleration factor AF T =exp is calculated through the formula AF T , wherein, is the activation energy, the unit is J / mol; R is the gas constant, 8.314 J / mol·K; T1 is the experimental temperature, the unit is K; T2 is the actual use temperature, the unit is K; Step S4.2: The humidity acceleration factor AF H =exp Computing the humidity acceleration factor AF H wherein, is the activation energy of the humidity on the aging reaction, with the unit of J / mol; is the experimental humidity, with the unit of %; is the actual environmental humidity, with the unit of %; Step S4.3: The formula AF PH =exp Computing the pH acceleration factor AF PH wherein, is the activation energy of the pH on the aging reaction, with the unit of J / mol; is the experimental pH value; is the actual pH value in the use environment; Step S4.4: The formula AF UV =exp Computing the UV acceleration factor AF UV wherein, is the activation energy of the UV on the aging reaction of the material, with the unit of J / mol; is the UV radiation intensity in the experiment; is the UV radiation intensity in the actual use environment; Step S4.5: The formula AF V =exp Computing the air flow rate acceleration factor AFV, wherein, is the activation energy of the air flow rate on the aging reaction of the material, with the unit of J / mol; is the air flow rate in the experiment; is the air flow rate in the actual use environment; Step S4.6: The formula AF m =exp · Computing the acceleration factor of mechanical alternating load, wherein, is the activation energy of the vibration load on the aging reaction of the material, with the unit of J / mol; is the vibration frequency in the experiment, with the unit of Hz; is the vibration frequency in the actual environment, with the unit of Hz; is the vibration load amplitude in the experiment, with the unit of Pa; is the fatigue limit stress of the material, i.e. the maximum stress that the material can withstand without fatigue fracture, with the unit of Pa; n is an index related to the fatigue characteristics of the material, which is generally the fatigue strength index of the material, and is usually determined by experimental data; Step S4.7: The formula for calculating the composite acceleration factor is: AF total=exp ×exp ×exp ×exp ×exp ×exp · ; Step S4.8: calculate the predicted life L2 of the coating, the relationship between the predicted life L2 and the accelerated aging life L1 can be expressed as: L2=L1*AF total . BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the coating material life evaluation system in the embodiment of the application; Figure 2 It is a front view schematic diagram of the coating material life evaluation system in the embodiment of the application; Figure 3 It is a structural schematic diagram of the adjusting clamp in the embodiment of the application; Figure 4 It is a connecting structure schematic diagram of the clamping block in the embodiment of the application; Figure 5 It is a structural schematic diagram of the clamping block in the embodiment of the application. DETAILED DESCRIPTION

[0019] The following will be further described in detail through specific embodiments: The marks in the drawings of the specification include: test box body 1, partition plate 11, air duct inlet 12, air duct outlet 13, control panel 14, pressure stabilizing valve 15, first chamber 2, fan 21, rotating blade 22, dry air inlet 23, wet air inlet 24, acid air inlet 25, alkaline air inlet 26, second chamber 3, air speed meter 31, temperature sensor 32, humidity sensor 33, PH sensor 34, strain gauge 35, ultraviolet lamp 36, electromagnetic exciter 37, adjusting clamp 4, clamping block 41, plate clamping surface 411, columnar body clamping surface 412, cubic clamping groove 413, spherical body clamping surface 414, X-axis rail 42, Y-axis rail 43, Z-axis rail 44.

[0020] EMBODIMENT The embodiment is basically as shown in Figure 1 , Figure 2 : a coating material life evaluation system, including an experimental box body, including a partition plate, the partition plate divides the experimental box body into a first chamber and a second chamber, an air duct inlet is formed on the side of the partition plate, an air duct outlet is formed on the left side wall of the experimental box body corresponding to the position of the air duct inlet, a pressure stabilizing valve is installed on the right side wall of the experimental box body to ensure that the air pressure in the box is stable. The front of the experimental box body is an openable movable door, and a sealing strip is arranged between the movable door and the experimental box body.

[0021] The first chamber is provided with a temperature control unit, a humidity control unit, an acid-base control unit, a flow rate control unit and a rotating blade.

[0022] The flow rate control unit comprises a fan and an air speed meter. The fan is fixed to the middle of the left side wall of the first chamber, and the air outlet of the fan faces the inside of the chamber. The air speed meter is installed on the rear side wall of the second chamber. The rotating blade is fixed to the center of the first chamber through a bearing, and the center of the blade is at the same height as the center of the air outlet of the fan.

[0023] The temperature control unit comprises a ceramic heating sheet and a temperature sensor. The ceramic heating sheet is arranged inside the fan to blow hot air in cooperation with the fan. The temperature sensor is fixed to the rear side wall of the second chamber through a flexible wire.

[0024] The humidity control unit comprises a dry air inlet, a wet air inlet and a humidity sensor. The dry air inlet and the wet air inlet are opened on the left side wall of the first chamber. The dry air inlet and the wet air inlet are respectively connected with a dry gas generating device and a wet gas generating device outside. The humidity sensor is arranged in the second chamber through a flexible wire. The acid-base control unit comprises an acidic air inlet, an alkaline air inlet and a pH sensor. The acidic air inlet and the alkaline air inlet are opened on the left side wall of the first chamber. The acidic air inlet is connected with an acidic aerosol generating device, and the alkaline air inlet is connected with an alkaline aerosol generating device. The pH sensor is fixed to the rear side wall of the second chamber through a flexible wire.

[0025] The dry air inlet, the wet air inlet, the acidic air inlet and the alkaline air inlet are connected with baffles. The area and size of the baffles are not less than the cross-sectional size of the air inlets. There are gaps between the baffles and the air inlets. The dry gas, the wet gas, the acidic gas and the alkaline gas enter the first chamber in a diffuse manner through the gaps. The baffles are used to block the gas entering the first chamber from directly aiming at the rotating blade, so as to avoid generating additional flow rate parameters that affect the air flow rate, ensure that the air flow rate in the experiment box body is single and controllable. The above-mentioned gas entering the first chamber is blown by the fan and mixed by the rotating blade to form stable environmental parameters, and finally enters the second chamber through the air duct inlet.

[0026] The second chamber is provided with an ultraviolet light generating device, an alternating load applying device and an adjusting clamp. The adjusting clamp is arranged at the bottom of the second chamber for clamping the experimental sample, and the adjusting clamp adjusts the position of the experimental sample on the X, Y and Z axes.

[0027] The ultraviolet light generating device in the second chamber comprises three ultraviolet lamps, which are respectively fixed to the center of the left side wall, the center of the rear side wall and the center of the right side wall of the second chamber to ensure uniform illumination of light.

[0028] The alternating load applying device adopts an electromagnetic exciter fixed at the middle of the top of the second chamber, and the excitation head faces the center of the chamber.

[0029] The adjusting clamp is arranged below the electromagnetic exciter, and is located between the air duct inlet and the air duct outlet. Figure 3 As shown in the figure, the adjusting clamp comprises a cubic frame rail and a clamping block, the cubic frame rail has four X-axis rails, four Y-axis rails and four Z-axis rails, the clamping block is slidingly connected to the Y-axis rail, as shown in the figure, the clamping block and the Y-axis rail are both provided with through holes, the clamping block and the Y-axis rail are fixed by a pin passing through the through holes, the Y-axis rail is slidingly connected to the X-axis rail and is fixed by a first fastening bolt, and the X-axis rail is slidingly connected to the Z-axis rail and is fixed by a second fastening bolt. Figure 4 As shown in the figure, the clamping block is provided with a plate clamping surface, a columnar body clamping surface, a cubic clamping groove and a spherical clamping surface. Figure 5 In other embodiments, the clamping block is slidingly connected to the Y-axis rail through a sliding seat, the clamping block and the sliding seat are connected by magnetic attraction, and the middle part of the clamping block and the sliding seat is connected by a movable connecting shaft, and the clamping block can rotate 360° around the connecting shaft.

[0030] In this embodiment, the control module is equipped with a control panel, and the control module is electrically connected with the temperature control unit, the humidity control unit, the acid-base control unit, the flow rate control unit, the ultraviolet light generating device and the alternating load applying device, so that the sensor data can be collected in real time and the control signals can be output to each device.

[0031] According to the above device, another aspect of the present application provides a scheme, which is a coating material life evaluation method, comprising the following steps: Step S1: After the surface of the coating sample is cleaned and dried, the coating sample is clamped by the adjusting clamp, the clamping block is used to preliminarily clamp the coating sample, and the pin is inserted to fix the position of the clamping block on the Y-axis rail. The Y-axis rail assembly is moved along the X-axis rail to align the center of the sample with the excitation head of the electromagnetic exciter, and the first fastening bolt is tightened; the X-axis rail assembly is raised and lowered along the Z-axis rail to adjust the distance between the surface of the coating sample and the ultraviolet lamp, and the second fastening bolt is tightened. The temperature sensor, the humidity sensor, the PH sensor and the strain gauge are arranged on the coating sample through the stretchable wire.

[0032] Step S2: Set the experimental parameters through the control panel of the control module, the control module controls the opening of the dry inlet and the wet inlet, and inputs dry gas and water mist into the first chamber in a diffuse manner, the acid inlet or the base inlet is opened, and the acid gas or the base gas is diffused and released into the first chamber, and the heating piece is started to heat up. The control module starts the fan to output airflow, and the airflow drives the rotating blade to rotate to fully stir the temperature, humidity and acid-base gas in the chamber. In this process, the pressure stabilizing valve monitors the air pressure in the box in real time to maintain the stability of the air pressure in the test box body; the temperature sensor, humidity sensor and PH sensor feed back data in real time, and the control module dynamically adjusts the opening degree of each inlet and the power of the heating piece until each parameter reaches the preset value and stabilizes. The uniformly mixed environmental gas in the first chamber flows into the second chamber through the air duct inlet and forms an airflow path along the air duct outlet; the control module synchronously starts the ultraviolet light generating device and the electromagnetic exciter to output ultraviolet light and alternating load according to the preset parameters; and the control module receives the detection data of the temperature sensor, humidity sensor, PH sensor, air speed meter and strain gauge during the experiment; Step S3: After the sample appears a failure condition, record the time L1 of the accelerated aging experiment, and the control module closes the ultraviolet light generating device, the alternating load applying device, the rotating blade, the temperature, humidity or acid-base control unit; Step S4: Organize the experimental data collected in step S2, calculate the service life of the coating material in the actual service environment according to the principle of accelerated aging experiment and in combination with the acceleration factor; Step S4.1: Calculate the temperature acceleration factor AF T =exp by the formula AF T , wherein, is the activation energy, the unit is J / mol; R is the gas constant, 8.314 J / mol·K; T1 is the experimental temperature, the unit is K; T2 is the actual use temperature, the unit is K; Step S4.2: Calculate the humidity acceleration factor AF H =exp by the formula AF H , wherein, is the activation energy of humidity on aging reaction, the unit is J / mol; is the experimental humidity, the unit is %; is the actual environmental humidity, the unit is %; Step S4.3: Calculate the acid-base degree acceleration factor AF PH =exp by the formula AF PH , wherein, is the activation energy of acid-base degree on aging reaction, the unit is J / mol; is the experimental PH value; for the pH value in the actual use environment; Step S4.4: Calculate the UV acceleration factor AF UV =exp Calculate the UV acceleration factor AF UV wherein, is the activation energy of the UV radiation on the material aging reaction, in J / mol; is the UV radiation intensity in the experiment; is the UV radiation intensity in the actual use environment; Step S4.5: Calculate the air flow rate acceleration factor AF V =exp Calculate the air flow rate acceleration factor AF V wherein, is the activation energy of the air flow rate on the material aging reaction, in J / mol; is the air flow rate in the experiment; is the air flow rate in the actual use environment; Step S4.6: Calculate the acceleration factor of mechanical alternating load, wherein m =exp · Calculate the acceleration factor of mechanical alternating load, wherein is the activation energy of the vibration load on the material aging reaction, in J / mol; is the vibration frequency in the experiment, in Hz; is the vibration frequency in the actual environment, in Hz; is the vibration load amplitude in the experiment, in Pa; is the fatigue limit stress of the material, i.e. the maximum stress that the material can withstand without fatigue fracture, in Pa; n is an index related to the fatigue characteristics of the material, generally the fatigue strength index of the material, which is usually determined by experimental data; Step S4.7: Calculate the composite acceleration factor, which is calculated according to the formula: AF total =exp ×exp ×exp ×exp ×exp ×exp · ; Step S4.8: Calculate the predicted service life L2 of the coating, and the relationship between the predicted service life L2 and the accelerated aging life L1 can be expressed as: L2=L1×AF total .

[0033] The dry inlet, the wet inlet, the acid inlet and the base inlet of the embodiment do not produce flow rate, enter the first chamber in a diffuse manner, avoid disturbance to the environment in the test box body caused by the inlet airflow, control the overall flow rate in the test box body by the fan, the airflow generated by the fan drives the rotating blades to fully stir the temperature, humidity, acid and base gas in the first chamber, solve the chaos state problem caused by the simple superposition of multiple factors of the existing device. Cooperate with the first chamber and the second chamber partition, make the environmental parameters form a stable combined state before acting on the sample, realize effective decoupling of each parameter. The device improves the accuracy of the collected aging data, provides a reliable basis for life evaluation.

[0034] The above is only an embodiment of the present application, and the specific structure and characteristics of the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicability of the present application. The specific embodiments in the specification can be used to explain the content of the claims.

Claims

1. A coating material life assessment system, characterized in that: include: The experimental chamber body includes a partition that divides the interior of the experimental chamber body into a first chamber and a second chamber. An air duct inlet is provided between the first chamber and the second chamber. An air duct outlet is provided on the experimental chamber body opposite to the air duct inlet. A pressure regulating valve is provided on the experimental chamber body. The first chamber is equipped with a temperature control unit, a humidity control unit, an acid-base control unit, a flow rate control unit, and rotating blades; The second chamber is equipped with an ultraviolet generator, an alternating load application device, and an adjustment clamp. The adjustment clamp is located at the bottom of the second chamber for holding the experimental sample. The adjustment clamp is located between the air duct inlet and the air duct outlet, and the adjustment clamp can adjust the position of the experimental sample on the X, Y, and Z axes. The control module is electrically connected to the temperature control unit, humidity control unit, acid-base control unit, flow rate control unit, ultraviolet generator, and alternating load application device.

2. The coating material life assessment system according to claim 1, characterized in that: The adjusting fixture includes a cubic frame track and several clamping blocks. The cubic frame track has four lengths forming the X-axis, four widths forming the Y-axis, and four heights forming the Z-axis. The clamping blocks are slidably connected to the Y-axis track, the Y-axis track is slidably connected to the X-axis track and fixed by the first fastening bolt, and the X-axis track is slidably connected to the Z-axis track and fixed by the second fastening bolt.

3. The coating material life assessment system according to claim 2, characterized in that: Clamping blocks include one or more of the following: plate clamping surfaces, columnar clamping surfaces, cubic clamping grooves, and spherical clamping surfaces.

4. The coating material life assessment system according to claim 2, characterized in that: The clamp also includes a sliding seat, which is rotatably connected to the sliding seat and magnetically connected to the sliding seat. The sliding seat is slidably connected to the Y-axis track.

5. The coating material life assessment system according to claim 1, characterized in that: The flow rate control unit includes a fan and an air speed meter. The fan is installed on the side wall of the first chamber, and the air speed meter is installed on the side wall of the second chamber.

6. The coating material life assessment system according to claim 1, characterized in that: The temperature control unit includes a heating element and a temperature sensor. The heating element is located inside the fan, and the temperature sensor is placed on the side wall of the second chamber via a telescopic cable.

7. The coating material life assessment system according to claim 1, characterized in that: The humidity control unit includes a dry air inlet, a wet air inlet, and a humidity sensor. The dry air inlet and the wet air inlet are located on the side wall of the first chamber, and the humidity sensor is placed on the side wall of the second chamber via a telescopic cable.

8. The coating material life assessment system according to claim 1, characterized in that: The acid-base control unit includes an acid inlet, an alkaline inlet, and a pH sensor. The acid and alkaline inlets are located on the side wall of the first chamber, while the pH sensor is placed on the side wall of the second chamber via a telescopic cable.

9. The coating material life assessment system according to claim 1, characterized in that: The alternating load application device includes an electromagnetic vibrator and a strain gauge. The electromagnetic vibrator is fixed in the second chamber, and the strain gauge is placed on the side wall of the second chamber via a telescopic cable.

10. A method for evaluating the lifespan of a coating material, characterized in that: Includes the following steps: Step S1: The experimental sample is clamped and fixed by the clamping blocks. The position of the experimental sample is finely adjusted in three-dimensional space by the cubic frame track. The temperature sensor, humidity sensor, pH sensor and strain gauge are arranged in the second chamber close to the experimental sample by the telescopic line. Step S2: Input the preset experimental parameters through the control module. The control module drives the temperature control unit, humidity control unit, acid-base control unit, flow rate control unit, rotating blade, ultraviolet generator and alternating load application device to work. During the experiment, the control module receives the detection data from the temperature sensor, humidity sensor, pH sensor, air velocity meter and strain gauge. Step S3: After the sample fails, record the accelerated aging test time L1, and shut down the ultraviolet generator, alternating load application device, rotating blade, temperature, humidity or acid-base control unit. Step S4: Organize the experimental data collected in step S2, and calculate the lifespan of the coating material under actual service environment based on the principle of accelerated aging test and the acceleration factor. Step S4.1: Using formula AF T =exp Calculate the temperature acceleration factor AF T ,in, Activation energy, in J / mol; R is the gas constant, 8.314 J / mol·K; T1 is the experimental temperature, in K; T2 is the actual operating temperature, in K. Step S4.2: Using formula AF H =exp Calculate the humidity acceleration factor AF H ,in, The activation energy of humidity on the aging reaction is expressed in J / mol. The humidity level is measured in percentages (%). This represents the actual ambient humidity, expressed in % %. Step S4.3: Using formula AF PH =exp Calculate the acid-base acceleration factor AF PH ,in, The activation energy of the aging reaction is given by pH, expressed in J / mol. The pH value was used in the experiment. This refers to the pH value in the actual usage environment. Step S4.4: Using formula AF UV =exp Calculate the ultraviolet acceleration factor AF UV ,in, The activation energy of the material aging reaction caused by ultraviolet light is expressed in J / mol. The intensity of ultraviolet radiation in the experiment; This represents the intensity of ultraviolet radiation in the actual usage environment. Step S4.5: Using formula AF V =exp Calculate the air velocity acceleration factor AF V ,in, The activation energy of airflow velocity on the aging reaction of materials is expressed in J / mol. The air velocity during the experiment; This refers to the airflow velocity in the actual usage environment. Step S4.6: Using formula AF m =exp · Calculate the acceleration factor for the mechanical alternating load, where, The activation energy of the material aging reaction caused by vibration load is expressed in J / mol. The vibration frequency in the experiment is expressed in Hz. The vibration frequency in the actual environment is expressed in Hz. The amplitude of the vibration load in the experiment is expressed in Pa. is the fatigue limit stress of the material, which is the maximum stress that the material can withstand without fatigue fracture, and the unit is Pa; n is an index related to the fatigue characteristics of the material, generally the fatigue strength index of the material, which is usually determined by experimental data. Step S4.7: Calculate the composite acceleration factor, the formula of which is as follows: OF total =exp ×exp ×exp ×exp ×exp ×exp · ; Step S4.8: Calculate the predicted lifetime L2 of the coating. The relationship between the predicted lifetime L2 and the accelerated aging lifetime L1 can be expressed as: L2 = L1 × AF total .

Images