Method for evaluating cavitation erosion resistance of paint coating based on ultrasonic technology

Abstract

The invention relates to a paint coating cavitation erosion resistance evaluation method based on an ultrasonic technology, belongs to the technical field of paint coating performance evaluation, and solves the problem that in the prior art, it is difficult to comprehensively observe and accurately simulate an ultrasonic bubble dynamic process in a laboratory. The method comprises the following steps: preparing a sample wafer on a steel plate by adopting a unified process, placing the sample wafer in an experimental water tank, generating a cavitation bubble group by using an ultrasonic generator to simulate cavitation erosion, collecting data through equipment such as a high-speed camera, a hydrophone and a pressure sensor, and obtaining damage time and area by virtue of an image processing algorithm and a super field depth microscope. And the cavitation erosion resistance is analyzed and evaluated through data processing. Rapid and accurate evaluation can be realized in a laboratory, the test period is shortened, and the cost is reduced; the evaluation accuracy, reliability and repeatability are improved; and a scientific basis can be provided for coating research and development, quality control and engineering application.

Description

Technical Field

[0001] The invention relates to an ultrasonic technology-based paint coating anti-cavitation ability evaluation method, belonging to the technical field of paint coating performance evaluation. Background Art

[0002] Bubbles are widely present in nature. When bubbles flow with liquid to low-pressure areas, they will grow violently and form cavitation. The cavitation bubbles that are constantly formed and grown in the fluid will frequently collapse near the solid wall, and the wall will be subjected to repeated pulse loads, causing fatigue damage to the material and even surface erosion, which is the cavitation erosion phenomenon, referred to as cavitation. The cavitation resistance of paint refers to the ability of the paint coating to resist surface damage when it is subjected to the strong impact force generated by the collapse of bubbles. This ability is particularly important for underwater equipment such as propellers, turbines, and water pumps. Flow-through components, because these components may suffer cavitation damage during high-speed operation, causing premature failure of components and even safety accidents.

[0003] In the past, the evaluation methods for the cavitation resistance of paints were usually actual environmental exposure tests and traditional mechanical properties tests. The actual environmental exposure test exposes the coating samples to the natural environment, such as the marine atmosphere, to assess the performance and durability of the coating in the actual use environment. However, this method has a long test cycle and is limited by geographical location and environmental conditions. It is impossible to evaluate the cavitation resistance of the coating in different environments at the same time. The traditional mechanical properties testing methods in the laboratory are also difficult to test the cavitation resistance of the coating itself due to the complex interface between the coating and the substrate. In addition, different paint materials and preparation processes will lead to differences in microstructure and mechanical properties, making it difficult to formulate a unified test method. Moreover, traditional mechanical properties testing methods often lack reliability and repeatability. It is urgent to develop a new coating cavitation resistance evaluation method that can quickly evaluate different types of paints in the laboratory by using the cavitation erosion mechanism of bubble groups on paint coatings and combining the cavitation mechanism of gas-liquid-solid three-phase coupling. Summary of the invention

[0004] The present invention proposes a method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology. A sample is prepared by adopting a unified dipping process. In an experimental environment constructed by a specific experimental equipment combination, an ultrasonic generator is used to generate a cavitation bubble group to simulate a cavitation environment. High-speed photography, image processing algorithms, ultra-depth-of-field microscopes and other means are combined to accurately obtain the time point of initial damage of the paint coating and the area of ​​the damaged region, which are used as core evaluation parameters for data processing and analysis. This solves the problems of existing paint cavitation resistance evaluation methods that are difficult to quickly and accurately evaluate in a laboratory environment, have a long test cycle, are subject to environmental restrictions, lack reliability and repeatability, and are difficult to test the cavitation resistance of the coating alone.

[0005] A method for evaluating the cavitation resistance of a paint coating based on ultrasonic technology, the method comprising the following steps:

[0006] S100, using a unified process to evenly apply a variety of paints on substrates of the same specifications to prepare test samples;

[0007] S200, placing the sample to be tested at the bottom of the experimental water tank, fixing the ultrasonic device and recording the relative position between the ultrasonic device and the sample to ensure stable experimental conditions;

[0008] S300, using ultrasound to generate cavitation bubbles at the same time and excitation power to erode the sample, while measuring the flow field and the pressure at the bottom of the water tank;

[0009] S400. After the experiment, the damage time and damaged area of ​​the sample were obtained with the help of various equipment, and the data were analyzed to quantify the anti-cavitation performance.

[0010] Furthermore, in S100, the substrate is a steel plate.

[0011] Furthermore, in S200, the ultrasonic device is an ultrasonic generator, and a high-speed camera is used to accurately record the actual distance between the probe of the ultrasonic generator and the sample to be tested.

[0012] Furthermore, in S300, a hydrophone is used to measure the flow field pressure, and a pressure sensor is used to measure the pressure at the bottom of the water cylinder to ensure that the pressure value applied by the ultrasonic cavitation field on the sample coating remains at the same order of magnitude.

[0013] Furthermore, in S400, a high-speed camera is used to record the entire experimental process, and an image processing algorithm is used to accurately identify the time point when the paint coating is first damaged. At the same time, the surface of the sample is scanned with high resolution using an ultra-depth of field microscope, and the area of ​​the damaged area of ​​the coating, i.e., the damaged area, is quantitatively determined using image analysis software.

[0014] Furthermore, in S400, the data of damage time and damage area are standardized.

[0015] Furthermore, in S400, according to the different requirements of the experimental objectives, corresponding weights are assigned to the indicators of damage time and damage area, and the comprehensive anti-cavitation score is calculated accordingly. Through statistical analysis of multiple groups of experimental data, the anti-cavitation performance of different coating materials is compared. If the coating shows a longer damage time and a smaller damage area, it can be judged that its anti-cavitation performance is excellent; on the contrary, if the coating has a large area of ​​damage in a relatively short time, it indicates that its corrosion resistance is poor.

[0016] Furthermore, when focusing on evaluating the initial corrosion resistance of the coating in a high-intensity cavitation environment, a higher weight is given to the damage time; in long-term durability tests, a higher weight is given to the damage area.

[0017] A storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned method for evaluating the cavitation resistance of a paint coating based on ultrasonic technology.

[0018] A computer device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-mentioned method for evaluating the cavitation resistance of a paint coating based on ultrasonic technology.

[0019] Beneficial effects of the present invention: The present invention is a method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology. By adopting a unified process to prepare samples, using specific experimental equipment to build a simulated environment, and combining a variety of detection methods to obtain key evaluation parameters, it effectively overcomes the difficulty of existing evaluation methods in rapid and accurate evaluation in the laboratory. There is no need to conduct time-consuming and costly actual environmental exposure experiments, which greatly shortens the test cycle. At the same time, the accurately obtained data such as the damage time and damaged area, after standardized processing and analysis after reasonable weight assignment, can more accurately quantify the cavitation resistance of the paint coating, improve the accuracy of the evaluation, and the data monitoring and recording during the experiment ensure the reliability and repeatability of the experiment, providing an efficient, scientific and economical evaluation method for the field of paint coating performance evaluation technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic diagram of the structure of an experimental device used for evaluating the cavitation resistance of a paint coating based on ultrasonic technology. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] A method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology is based on an experimental device and refers to Figure 1As shown, it includes an ultrasonic generator, an experimental water tank, a sound wave receiving system, a fixture, a signal amplifier and an oscilloscope. The experimental water tank contains liquid and a paint coating is arranged at the bottom of the tank. The ultrasonic generator and the probe of the sound wave receiving system are arranged below the liquid surface through the fixture. The probe of the sound wave receiving system surrounds the ultrasonic generator probe. The signal output end of the probe of the sound wave receiving system is connected to the signal input end of the signal amplifier. The signal output end of the signal amplifier is connected to the signal input end of the oscilloscope. A high-speed camera is arranged outside the experimental water tank, and the lens faces the area between the probe of the ultrasonic generator and the paint coating. The method for evaluating the anti-cavitation ability of paint coating based on ultrasonic technology includes the following steps:

[0023] S100, using a unified process to evenly apply a variety of paints on substrates of the same specifications to prepare test samples;

[0024] S200, placing the sample to be tested at the bottom of the experimental water tank, fixing the ultrasonic device and recording the relative position between the ultrasonic device and the sample to ensure stable experimental conditions;

[0025] S300, using ultrasound to generate cavitation bubbles at the same time and excitation power to erode the sample, while measuring the flow field and the pressure at the bottom of the water tank;

[0026] S400. After the experiment, the damage time and damaged area of ​​the sample were obtained with the help of various equipment, and the data were analyzed to quantify the anti-cavitation performance.

[0027] Specifically, the method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology of the present invention prepares the test samples through a unified process, ensures the consistency of the samples, and provides a basis for subsequent accurate evaluation. Moreover, the process can be applied to a variety of paints and substrates of the same specifications, and has wide applicability. In the experimental preparation stage, the samples are carefully placed and the relative position of the ultrasonic equipment and the samples is accurately recorded. This not only ensures the high stability of the experimental conditions each time, but also this stable experimental setting can effectively reduce the errors caused by fluctuations in experimental conditions and improve the reliability and repeatability of the experimental results. In the process of simulating cavitation, the time and excitation power of the ultrasound are strictly controlled to generate cavitation bubble groups, and the flow field and the pressure at the bottom of the water cylinder are accurately measured to ensure that the pressure applied to the coating is at the same order of magnitude. This precise simulation and measurement method can highly realistically restore the actual cavitation environment, making the experimental results more convincing, and can effectively avoid experimental deviations caused by factors such as pressure differences. In the evaluation phase after the experiment, the damage time and damaged area of ​​the samples were obtained with the help of a variety of advanced equipment, and the anti-cavitation performance was quantified through rigorous data processing and analysis. Among them, the image processing algorithm adopted a deep learning-based convolutional neural network image recognition algorithm that has been verified by a large number of experiments and has a high degree of recognition in the industry. Its principle is based on the analysis of image pixel changes. By identifying the changes in the optical characteristics of the coating surface during the experiment, the time point of coating damage can be accurately determined. Specifically, the algorithm uses the mutation characteristics of the pixel gray value in the image and combines the time series analysis method to identify the time when the coating surface first appears damaged. The image analysis software uses professional ImageJ, which has high-precision area recognition and measurement functions, and can accurately mark and quantify the damaged area of ​​the coating. Through ImageJ, combined with the automatic segmentation algorithm and the area detection module, the area of ​​the damaged area is accurately determined, thereby providing highly reliable analysis results for the experimental data. The standardization process in the data processing process adopts the Z-score standardization method, which can eliminate the deviation caused by differences in experimental conditions or different sample characteristics, and normalize the data to the standard normal distribution range. The weight assignment is reasonably allocated based on the experimental purpose and the scientific basis obtained from the statistical analysis of a large amount of experimental data, so that the cavitation resistance of the paint coating can be comprehensively and accurately evaluated.

[0028] Furthermore, in S100, the substrate is a steel plate.

[0029] Specifically, during the sample preparation stage, a unified process is used to evenly apply a variety of paints onto a specific steel plate substrate. The steel plate as a substrate has good rigidity and stability, which can provide a solid adhesion foundation for the paint coating, ensuring that the bonding state between the coating and the substrate is relatively stable during subsequent experiments, thereby making the experimental results more credible.

[0030] Furthermore, in S200, the ultrasonic device is an ultrasonic generator, and a high-speed camera is used to accurately record the actual distance between the probe of the ultrasonic generator and the sample to be tested.

[0031] Specifically, the high-speed camera uses the advanced Phantom T4040, which has extremely high distance measurement accuracy and can control the error within a very small range. During the experimental preparation process, the operation of accurately recording the distance ensures that the initial conditions of the ultrasonic wave acting on the sample are highly consistent in each experiment. This not only effectively avoids the different impact effects of cavitation bubble groups on the sample caused by distance differences, but also greatly improves the repeatability and accuracy of the experiment. This makes the subsequent experimental results more reliable and lays a solid foundation for accurately evaluating the anti-cavitation ability of paint coatings.

[0032] Furthermore, in S300, a hydrophone is used to measure the flow field pressure, and a pressure sensor is used to measure the pressure at the bottom of the water cylinder to ensure that the pressure value applied by the ultrasonic cavitation field on the sample coating remains at the same order of magnitude.

[0033] Specifically, in S300, this precise pressure measurement method ensures that the pressure value applied by the ultrasonic cavitation field on the sample coating always remains at the same level. In this way, the interference with the experimental results caused by unstable or inconsistent pressure is effectively eliminated, making the experimental environment more stable and reliable, and the experimental data more comparable. This can accurately simulate the cavitation pressure conditions that the paint coating is subjected to under actual working conditions, greatly improving the accuracy of the evaluation of the cavitation resistance of the paint coating, providing solid data support for coating research and development, quality control and related engineering applications, and strongly promoting the development of paint coating performance evaluation technology.

[0034] Furthermore, in S400, a high-speed camera is used to record the entire experimental process, and an image processing algorithm is used to accurately identify the time point when the paint coating is first damaged. At the same time, the surface of the sample is scanned with high resolution using an ultra-depth of field microscope, and the area of ​​the damaged area of ​​the coating, i.e., the damaged area, is quantitatively determined using image analysis software.

[0035] Specifically, in the S400 stage, a high-speed camera records the entire experimental process. Combined with the deep learning-based convolutional neural network image recognition algorithm, it has been trained and optimized with a large amount of experimental data, and can accurately capture the changes in the optical characteristics of the coating surface. It can accurately identify the time point when the paint coating is first damaged, which provides accurate data for evaluating the initial corrosion resistance of the coating under cavitation impact, allowing us to clearly understand the difference in the length of time that different coatings withstand the initial impact. At the same time, with the help of an ultra-depth of field microscope, the surface of the sample is scanned at high resolution, and the area of ​​the damaged area of ​​the coating is quantitatively determined with professional image analysis software. This damaged area data directly reflects the durability of the coating under continuous cavitation. Combining the two, with the damage time and damage area as the core evaluation parameters, the cavitation resistance of the paint coating can be comprehensively, accurately and quantitatively evaluated, providing a scientific and objective basis for the comparison of the cavitation resistance of different paint coatings.

[0036] Furthermore, in S400, the data of damage time and damage area are standardized.

[0037] Specifically, standardizing the damage time and damage area data in S400 is one of the key links of the present invention. In the standardization process, we adopted a scientific and rigorous processing method based on the Z-score standardization principle. This method uses precise calculation steps. For the damage time, the average value (μ) and standard deviation (σ) of the damage time of all samples are first calculated, and then the damage time (x) of each sample is converted according to the formula (x-μ) / σ, so that the damage time data of different samples present a standard normal distribution, eliminating the experimental deviation caused by individual differences in samples (such as different initial strengths of different paint coatings themselves) and slight fluctuations in the experimental environment (such as the influence of slight changes in temperature, humidity, etc. during the experiment on the cavitation process). For the damage area data, according to its distribution characteristics, a suitable transformation method (such as logarithmic transformation, etc., if the data is skewed) or a similar standardized calculation (if the data is approximately normally distributed) is used to convert it into a unified and comparable numerical range. The advantage of this standardization process is that it enables data from different batches of experiments, different types of paint coatings, and obtained under different experimental conditions to be compared and analyzed under the same standard. Whether studying the anti-cavitation performance of new paint coatings or monitoring and improving the quality of existing coatings, accurate evaluation can be performed based on standardized data. This not only improves the accuracy and reliability of this evaluation method, but also enhances its versatility and repeatability. It provides more accurate performance feedback for coating developers, which helps to quickly screen out coating formulas with better performance; in terms of engineering applications, it can help engineers more reasonably choose paint coatings suitable for different working conditions, thereby effectively extending the service life of equipment and reducing maintenance costs. It has strongly promoted the technological progress of paint coatings in the field of anti-cavitation, ensuring that the entire evaluation process complies with scientific standards, avoiding inaccurate evaluation problems that may be caused by incomparable data, and effectively solving the problems of non-standard data processing and difficulty in accurately comparing the performance of different coatings in existing evaluation methods. It fills the technical gap in data standardization processing in this field and provides a solid technical guarantee for the evaluation of the anti-cavitation ability of paint coatings.

[0038] Furthermore, in S400, according to the different requirements of the experimental objectives, corresponding weights are assigned to the indicators of damage time and damage area, and the comprehensive anti-cavitation score is calculated accordingly. Through statistical analysis of multiple groups of experimental data, the anti-cavitation performance of different coating materials is compared. If the coating shows a longer damage time and a smaller damage area, it can be judged that its anti-cavitation performance is excellent; on the contrary, if the coating has a large area of ​​damage in a relatively short time, it indicates that its corrosion resistance is poor.

[0039] Specifically, in S400 of the present invention, in terms of weight assignment, we have determined a scientific and reasonable assignment system based on a large amount of preliminary experimental data and in-depth theoretical analysis. For example, in the high-intensity cavitation environment experiment that focuses on evaluating the initial corrosion resistance of the coating, the weight of the damage time is set to 0.7, and the weight of the damage area is set to 0.3. This is because in this case, the ability of the coating to resist the initial cavitation impact and delay the occurrence of damage is crucial; in the long-term durability test, the weight of the damage area is increased to 0.8, and the weight of the damage time is reduced to 0.2, because at this time the ability of the coating to maintain a smaller damaged area under continuous cavitation becomes a key performance indicator. When calculating the comprehensive anti-cavitation score, the calculation method of comprehensive score = standardized value of damage time × corresponding weight + standardized value of damage area × corresponding weight is adopted. In this way, the two key indicators are organically combined to comprehensively and accurately quantify the anti-cavitation performance of the coating. By conducting rigorous statistical analysis on multiple sets of experimental data, the influence of accidental errors can be effectively eliminated, making the comparison of the anti-cavitation performance of different coating materials more objective and accurate. If the coating shows a long damage time and a small damage area, it indicates that it has excellent initial impact resistance and long-term corrosion resistance in the process of resisting cavitation, and thus it can be judged that its cavitation resistance is excellent; on the contrary, if the coating is damaged in a large area in a short period of time, it clearly shows that its corrosion resistance is poor. This evaluation method effectively solves the problem that it was difficult to comprehensively evaluate the cavitation resistance of coatings at different stages in the past, and fills the technical gap in accurate quantitative evaluation in this field. It provides a clear direction for coating research and development. R&D personnel can improve the coating formula and improve the coating performance in a targeted manner according to the specific weight influence; in engineering applications, it can help users quickly screen out the coating materials that are most suitable for specific working conditions, ensure the stable operation of equipment, reduce the risk of equipment damage and maintenance costs caused by cavitation, and effectively promote the technological progress of paint coatings in the evaluation and application of cavitation resistance, ensuring that the entire evaluation process is highly scientific, accurate and practical, and avoiding the problem of inaccurate judgment of coating performance due to incomplete evaluation methods.

[0040] Furthermore, when focusing on evaluating the initial corrosion resistance of the coating in a high-intensity cavitation environment, a higher weight is given to the damage time; in long-term durability tests, a higher weight is given to the damage area.

[0041] A storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned method for evaluating the cavitation resistance of a paint coating based on ultrasonic technology.

[0042] Specifically, the storage medium involved in the present invention stores a specific computer program. When the program is executed by the processor, the above-mentioned paint coating anti-cavitation ability evaluation method based on ultrasonic technology is realized. First, the use of the storage medium realizes the digital storage and convenient dissemination of the evaluation method, so that the advanced evaluation technology can be quickly promoted and applied in different laboratories, research institutions and industrial production scenarios, breaking the limitations of region and equipment. Researchers do not need to rebuild complex experimental processes and algorithm systems. They only need to obtain the program in the storage medium to carry out high-precision paint coating anti-cavitation ability evaluation work on the adapted computer equipment. Through the automated execution of the computer program, the efficiency and accuracy of the evaluation process are greatly improved. Compared with traditional manual experimental operations and data processing, the program can quickly and accurately control the ultrasonic generator to produce stable cavitation bubble groups according to the preset precise algorithms and steps, accurately collect and process data from equipment such as hydrophones and pressure sensors, use efficient image processing algorithms to identify the damage time point and ultra-depth of field microscope image analysis software to measure the damaged area, and strictly calculate the comprehensive anti-cavitation score according to scientific standardization processing and weight assignment system. The whole process avoids the errors and inconsistencies that may be caused by human operation, ensuring the reliability and repeatability of each evaluation result. In addition, the program in the storage medium has good scalability and compatibility. With the continuous development of paint coating technology and the in-depth study of cavitation mechanism, the program can be easily upgraded and optimized, and can timely integrate new experimental parameters, evaluation indicators or algorithm improvements to adapt to the changing scientific research and industrial needs. At the same time, it is compatible with various types and configurations of experimental equipment and computer systems, further reducing the application threshold of the evaluation method and promoting its application in a wider range of fields. This not only provides strong technical support for the research and development of paint coatings, accelerates the research and development process of high-performance anti-cavitation coatings, but also in engineering applications, can help enterprises more accurately select and use paint coatings, effectively extend the service life of equipment, reduce equipment maintenance costs and safety risks caused by cavitation, and promote the rapid development of the entire paint coating related industry in the field of anti-cavitation technology, with extremely high practical value and broad application prospects.

[0043] A computer device comprises: a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the above-mentioned method for evaluating the cavitation resistance of a paint coating based on ultrasonic technology.

[0044] Specifically, the computer device of the present invention integrates a memory, a processor and a corresponding computer program, and is used to implement a method for evaluating the cavitation resistance of a paint coating based on ultrasonic technology. When the processor executes the program stored in the memory, it can accurately and quickly control and analyze the entire evaluation process by virtue of its powerful computing power and efficient data processing speed. In the experimental operation, the time, excitation power and other parameters of the ultrasonic generator can be accurately controlled to ensure that the characteristics of the cavitation bubble group generated each time are consistent, and a highly stable cavitation environment is simulated, which is crucial for obtaining reliable experimental data. In terms of data acquisition, the processor can receive and process the flow field pressure data measured by the hydrophone and the water cylinder bottom pressure data collected by the pressure sensor in real time and accurately, ensuring the accuracy of the pressure monitoring applied by the ultrasonic cavitation field on the coating, effectively eliminating experimental errors, and making the experimental conditions more consistent and scientific. For the acquisition and analysis of experimental results, the processor uses advanced image processing algorithms to quickly process the images recorded by the high-speed camera, accurately identify the time point when the paint coating is first damaged, and efficiently drive the ultra-depth of field microscope for high-resolution scanning. With the help of professional image analysis software, the area of ​​the damaged area of ​​the coating is accurately determined. Based on these precise data, the comprehensive anti-cavitation score is calculated in strict accordance with the set standardized processing flow and reasonable weight assignment system, realizing a comprehensive and accurate quantitative evaluation of the anti-cavitation performance of the paint coating. The application of this computer equipment greatly improves the evaluation efficiency. Compared with traditional manual operation and analysis methods, it greatly shortens the evaluation cycle and can test and compare multiple paint coatings in a short time. Its high degree of automation and accuracy reduces the interference of human factors, ensures the reliability and repeatability of the evaluation results, provides timely and accurate data feedback for coating research and development, and helps R&D personnel to quickly optimize the coating formula and improve the anti-cavitation performance of the coating. In the field of engineering applications, enterprises can use this equipment to quickly screen out the paint coating that is most suitable for different working conditions, effectively extend the service life of the equipment, reduce the frequency of equipment failures and maintenance costs caused by cavitation, ensure the safe and stable operation of the engineering system, and effectively promote the progress of paint coating performance evaluation technology.

[0045] The present invention is a method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology. By adopting a unified process to prepare samples, using specific experimental equipment to build a simulated environment, and combining multiple detection methods to obtain key evaluation parameters, it effectively overcomes the problem that existing evaluation methods are difficult to evaluate quickly and accurately in the laboratory, and there is no need to conduct time-consuming and costly actual environmental exposure experiments, which greatly shortens the test cycle. At the same time, the accurately obtained data such as the damage time and damaged area can be analyzed after standardized processing and reasonable weight assignment to more accurately quantify the cavitation resistance of the paint coating, improve the accuracy of the evaluation, and the data monitoring and recording during the experiment ensure the reliability and repeatability of the experiment, providing an efficient, scientific and economical evaluation method for the field of paint coating performance evaluation technology.

[0046] It should be noted that, in this article, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology, characterized in that: The method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology comprises the following steps: S100, using a unified process to evenly apply a variety of paints on substrates of the same specifications to prepare test samples; S200, placing the sample to be tested at the bottom of the experimental water tank, fixing the ultrasonic device and recording the relative position between the ultrasonic device and the sample to ensure stable experimental conditions; S300, using ultrasound to generate cavitation bubbles at the same time and excitation power to erode the sample, while measuring the flow field and the pressure at the bottom of the water tank; S400. After the experiment, the damage time and damaged area of ​​the sample were obtained with the help of various equipment, and the data were analyzed to quantify the anti-cavitation performance.

2. The method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology according to claim 1, characterized in that: In S100, the substrate is a steel plate.

3. The method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology according to claim 2, characterized in that: In S200, the ultrasonic device is an ultrasonic generator, and a high-speed camera is used to accurately record the actual distance between the probe of the ultrasonic generator and the sample to be tested.

4. The method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology according to claim 3 is characterized in that: In S300, a hydrophone is used to measure the flow field pressure, and a pressure sensor is used to measure the pressure at the bottom of the water cylinder to ensure that the pressure value applied by the ultrasonic cavitation field on the sample coating remains at the same order of magnitude.

5. The method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology according to claim 4 is characterized in that: In S400, a high-speed camera is used to record the entire experimental process, and an image processing algorithm is used to accurately identify the time point when the paint coating is first damaged. At the same time, the surface of the sample is scanned at high resolution with the help of an ultra-depth-of-field microscope, and the area of ​​the damaged area of ​​the coating, i.e. the damaged area, is quantitatively determined by image analysis software.

6. The method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology according to claim 5 is characterized in that: In S400, the data of the damage time point and the damage area are standardized.

7. The method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology according to claim 6, characterized in that: In S400, according to the different requirements of the experimental objectives, corresponding weights are assigned to the indicators of damage time and damage area, and the comprehensive anti-cavitation score is calculated accordingly. Through statistical analysis of multiple groups of experimental data, the anti-cavitation performance of different coating materials is compared. If the coating shows a longer damage time and a smaller damage area, it can be judged that its anti-cavitation performance is excellent; on the contrary, if the coating has a large area of ​​damage in a relatively short time, it indicates that its anti-cavitation performance is poor.

8. The method for evaluating the cavitation resistance of paint coatings based on ultrasonic technology according to claim 7, characterized in that: When focusing on evaluating the initial corrosion resistance of the coating in a high-intensity cavitation environment, a higher weight is given to the damage time point; in long-term durability tests, a higher weight is given to the damage area.

9. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for evaluating the cavitation resistance of a paint coating based on ultrasonic technology as described in any one of claims 1 to 8 is implemented.

10. A computer device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement a method for evaluating the cavitation resistance of a paint coating based on ultrasonic technology as described in any one of claims 1 to 8.

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