A performance test system and method for a micro-arc oxidation product

Abstract

The application provides a performance test system and method of a micro-arc oxidation product, which comprises the following steps: obtaining a stable open circuit potential of the micro-arc oxidation product in an electrolyte solution at a preset temperature; taking the stable open circuit potential as a starting point, applying a linear potential signal to the micro-arc oxidation product, and determining a current inflection point of the micro-arc oxidation product corresponding to a micro-arc oxidation coating in an anode region in a potential signal scanning process; extracting an accelerated spectrum of a target environment for corrosion based on a coating integrity factor determined based on the current inflection point; placing the micro-arc oxidation product in a controllable environment box for accelerated corrosion exposure treatment based on the accelerated spectrum of the target environment, and determining a current degradation point of the micro-arc oxidation product corresponding to the micro-arc oxidation coating in the anode region after the corrosion exposure ends; and determining a corrosion resistance grade of the micro-arc oxidation product according to the current inflection point and the current degradation point. The technical scheme provided by the application can realize accurate matching of the corrosion resistance grade of the micro-arc oxidation product under accelerated corrosion test conditions.

Description

Technical Field

[0001] This application relates to the field of performance testing technology for oxidation products, and more specifically, to a performance testing system and method for micro-arc oxidation products. Background Technology

[0002] Oxidation products are widely used in industrial catalysis, electronic materials, metal protection and other fields. Their performance directly determines the efficiency and lifespan of end products. Therefore, performance testing is a core part of product research and development and application. If the core performance indicators of oxidation products do not meet the standards, it may lead to increased energy consumption in industrial production, oxidation failure of electronic components, and premature corrosion of metal components. As downstream industries continue to increase their requirements for product stability and environmental adaptability, it is urgent to establish a standardized and high-precision performance testing system to provide a scientific basis for product optimization, quality control and application selection.

[0003] In existing performance testing of oxidation products, the focus is on the effectiveness of oxidation function and environmental adaptability. In the test, oxidation efficiency is achieved by tracking the consumption of reactants or the generation of target products in the reaction system. Stability testing covers short-term reaction stability and long-term service stability. The former monitors the performance fluctuation range of the product in real time during continuous operation, while the latter retests the residual rate of core performance after aging under simulated working conditions to determine the degradation trend. Harsh working condition testing places the product in simulated environments such as high temperature, high humidity, and corrosive atmosphere for testing. However, in the corrosion resistance testing of micro-arc oxidation products, existing corrosion resistance testing methods for micro-arc oxidation coatings (such as standard salt spray tests) ignore the non-uniformity of the initial state of the micro-arc oxidation coating and the differences in defect distribution. This leads to the failure of matching the corrosion resistance level of micro-arc oxidation products under accelerated corrosion test conditions, resulting in deviations in the corrosion resistance test of micro-arc oxidation products. Therefore, how to achieve accurate matching of the corrosion resistance level of micro-arc oxidation products under accelerated corrosion test conditions has become a difficult problem for the industry. Summary of the Invention

[0004] This application provides a performance testing system and method for micro-arc oxidation products, which can achieve precise matching of the corrosion resistance level of micro-arc oxidation products under accelerated corrosion testing conditions.

[0005] In a first aspect, this application provides a performance testing method for micro-arc oxidation products, comprising the following steps:

[0006] The micro-arc oxidation product is placed in an electrolyte solution at a preset temperature, and the stable open-circuit potential of the micro-arc oxidation product is obtained through an electrical sensor.

[0007] Starting from the stable open circuit potential, a linear potential signal scanning from the cathode region to the anode region is applied to the micro-arc oxidation product, and a current density versus potential relationship spectrum is constructed during the potential signal scanning process. Then, the current inflection point of the micro-arc oxidation coating in the anode region of the micro-arc oxidation product is extracted from the relationship spectrum.

[0008] Based on the potential and current density value corresponding to the current inflection point, the coating integrity factor characterizing the micro-arc oxidation coating is determined, and the target environmental acceleration spectrum for corrosion is extracted from multiple predefined environmental acceleration spectra according to the coating integrity factor.

[0009] Based on the target environment acceleration spectrum, the micro-arc oxidation product is placed in a controlled environment chamber for accelerated corrosion exposure treatment. After the corrosion exposure is completed, the current degradation point of the corresponding micro-arc oxidation coating in the anodic region is detected by an electrical sensor.

[0010] The corrosion resistance level of the micro-arc oxidation product is determined based on the current inflection point and current degradation point of the corresponding micro-arc oxidation coating in the anodic region.

[0011] In some embodiments, obtaining the stable open-circuit potential of the micro-arc oxidation product via an electrical sensor specifically includes:

[0012] The micro-arc oxidation product is used as the working electrode, forming a three-electrode system with a preset reference electrode and a preset auxiliary electrode.

[0013] The three-electrode system is immersed in an electrolyte solution at a preset temperature to form a test circuit;

[0014] The electrical sensor is connected to the three-electrode system to construct a potential acquisition path;

[0015] The test circuit is left to stand until the potential drift rate of the working electrode obtained by the potential acquisition path meets the preset stability condition. The potential value at the corresponding time is then used as the stable open circuit potential of the micro-arc oxidation product.

[0016] In some embodiments, starting from the stable open-circuit potential, a linear potential signal scanning from the cathode region to the anode region is applied to the micro-arc oxidation product, and the relationship between current density and potential is constructed during the potential signal scanning process, specifically including:

[0017] Set the starting potential of the linear potential scan to a stable open-circuit potential, and set the scan rate;

[0018] Based on the initial potential and the scan rate, a linear potential signal is applied to the micro-arc oxidation product via an electrochemical workstation;

[0019] During the scanning process of applying a linear potential signal, the real-time potential value and corresponding real-time current value of the micro-arc oxidation product are simultaneously acquired.

[0020] The real-time current density is calculated based on the real-time current value and the test area of ​​the micro-arc oxidation product, and the real-time current density is correlated with the corresponding real-time potential value to construct a graph of the relationship between current density and potential.

[0021] In some embodiments, extracting the current inflection point of the micro-arc oxidation coating in the anodic region corresponding to the micro-arc oxidation product from the relationship graph specifically includes:

[0022] The potential range corresponding to the micro-arc oxidation coating of the micro-arc oxidation product in the anodic region is determined from the relationship diagram.

[0023] The first derivative of the relationship spectrum corresponding to the potential range is calculated to obtain the slope distribution of the current density as a function of potential.

[0024] Potential points whose rate of change exceeds a set rate of change threshold are selected from the slope distribution, and these potential points are marked as the current inflection points of the micro-arc oxidation coating in the anode region.

[0025] In some embodiments, determining the coating integrity factor characterizing the micro-arc oxidation coating based on the potential and current density value corresponding to the current inflection point specifically includes:

[0026] Obtain the reference critical potential and reference critical current density corresponding to the substrate of the same material as the micro-arc oxidation product and without coating;

[0027] Calculate the potential deviation between the potential value corresponding to the current inflection point and the reference critical potential, and the current density deviation between the current density corresponding to the current inflection point and the reference critical current density.

[0028] Based on the potential deviation value and the current density deviation value, the coating integrity factor characterizing the micro-arc oxidation coating is determined.

[0029] In some embodiments, extracting a target environmental acceleration spectrum for corrosion from a predefined plurality of environmental acceleration spectra based on the coating integrity factor specifically includes:

[0030] Obtain the coating integrity factor range corresponding to different preset environmental acceleration spectra;

[0031] The coating integrity factor is compared with each coating integrity factor interval to determine the interval to which the coating integrity factor belongs;

[0032] The environmental acceleration spectrum corresponding to the interval is used as the target environmental acceleration spectrum for corrosion.

[0033] In some embodiments, the electrical sensor includes a potential sensor and a current sensor.

[0034] Secondly, this application provides a performance testing system for micro-arc oxidation products, used to perform performance testing methods for micro-arc oxidation products, the system comprising:

[0035] The acquisition module is used to place the micro-arc oxidation product in an electrolyte solution at a preset temperature and acquire the stable open-circuit potential of the micro-arc oxidation product through an electrical sensor.

[0036] The processing module is used to apply a linear potential signal that scans from the cathode region to the anode region on the micro-arc oxidation product, starting from the stable open circuit potential, and to construct a current density versus potential graph during the potential signal scanning process, and then extract the current inflection point of the micro-arc oxidation coating in the anode region of the micro-arc oxidation product from the graph.

[0037] The processing module is also used to determine the coating integrity factor characterizing the micro-arc oxidation coating based on the potential and current density value corresponding to the current inflection point, and to extract the target environmental acceleration spectrum for corrosion from a number of predefined environmental acceleration spectra based on the coating integrity factor.

[0038] The processing module is also used to place the micro-arc oxidation product in a controlled environment chamber for accelerated corrosion exposure treatment based on the target environment acceleration spectrum, and after the corrosion exposure is completed, detect the current degradation point of the micro-arc oxidation coating corresponding to the micro-arc oxidation product in the anode area by an electrical sensor.

[0039] The execution module is used to determine the corrosion resistance level of the micro-arc oxidation product based on the current inflection point and current degradation point of the micro-arc oxidation coating in the anodic region.

[0040] Thirdly, this application provides a computer device, the computer device including a memory and a processor, the memory storing code, and the processor being configured to acquire the code and execute the above-described performance testing method for micro-arc oxidation products.

[0041] Fourthly, this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described performance testing method for micro-arc oxidation products.

[0042] The technical solutions provided by the embodiments disclosed in this application have the following beneficial effects:

[0043] The performance testing system and method for micro-arc oxidation products provided in this application firstly places the micro-arc oxidation product in an electrolyte solution at a preset temperature and obtains the stable open-circuit potential of the micro-arc oxidation product through an electrical sensor; secondly, starting from the stable open-circuit potential, a linear potential signal scanning from the cathode region to the anode region is applied to the micro-arc oxidation product, and a current density versus potential relationship spectrum is constructed during the potential signal scanning process, thereby extracting the current inflection point of the corresponding micro-arc oxidation coating in the anode region from the relationship spectrum; furthermore, based on the potential corresponding to the current inflection point... The coating integrity factor, characterizing the micro-arc oxidation coating, is determined by the current density value. Based on the coating integrity factor, a target environmental acceleration spectrum for corrosion is extracted from multiple predefined environmental acceleration spectra. Then, based on the target environmental acceleration spectrum, the micro-arc oxidation product is placed in a controlled environment chamber for accelerated corrosion exposure treatment. After the corrosion exposure is completed, the current degradation point of the micro-arc oxidation coating in the anodic region is detected by an electrical sensor. Finally, the corrosion resistance level of the micro-arc oxidation product is determined based on the current inflection point and current degradation point of the micro-arc oxidation coating in the anodic region.

[0044] Therefore, this application can achieve precise matching of the corrosion resistance level of micro-arc oxidation products under accelerated corrosion testing conditions. First, by obtaining a stable open-circuit potential in an electrolyte solution at a preset temperature, the interference of temperature fluctuations and the unstable adsorption state on the surface of the micro-arc oxidation product on the initial signal of the electrochemical test is eliminated, providing a precise and consistent electrochemical benchmark for subsequent tests. Second, a linear potential scan from the cathode region to the anode region is performed starting from the stable open-circuit potential, and a current density-potential relationship spectrum is constructed to accurately capture the current inflection point of the micro-arc oxidation coating from a stable protective state to an anodic reaction activation state, providing core electrochemical characteristic parameters for the integrity assessment of the micro-arc oxidation coating. Furthermore, based on the current inflection point parameter, the coating integrity factor is determined and the accelerated spectrum of the target environment is extracted, thereby quantifying the initial protective capability of the coating. The current method achieves precise matching between the accelerated corrosion environment and coating performance, ensuring the scientific rigor and efficiency of accelerated corrosion testing and avoiding the problem of corrosion resistance level mismatch in micro-arc oxidation products under accelerated corrosion testing conditions. Then, accelerated corrosion treatment is carried out based on the target environment's accelerated spectrum, and the current degradation point is monitored. A controlled environment chamber is used to reproduce the corrosion environment matching the coating performance, ensuring that the degradation mechanism of the micro-arc oxidation coating is consistent with actual service conditions. The critical node for the degradation of the protective performance of the micro-arc oxidation coating after corrosion is also located, overcoming the technical deficiency that post-corrosion assessment can only qualitatively determine coating failure and providing quantitative parameters for grade determination. Finally, the corrosion resistance grade is determined based on the current inflection point and the current degradation point. In summary, the technical solution provided in this application can achieve precise matching of the corrosion resistance grade of micro-arc oxidation products under accelerated corrosion testing conditions. Attached Figure Description

[0045] Figure 1 This is an exemplary flowchart of a performance testing method for micro-arc oxidation products according to some embodiments of this application;

[0046] Figure 2 This is an exemplary flowchart illustrating the determination of a relationship graph according to some embodiments of this application;

[0047] Figure 3 This is a schematic diagram of the structure of a performance testing system for micro-arc oxidation products according to some embodiments of this application;

[0048] Figure 4 This is a schematic diagram of the structure of a computer device for implementing a performance testing method for micro-arc oxidation products according to some embodiments of this application. Detailed Implementation

[0049] To better understand the technical solution of this application, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] refer to Figure 1 The figure is an exemplary flowchart of a performance testing method for micro-arc oxidation products according to some embodiments of this application. The figure mainly includes the following steps:

[0051] In step S101, the micro-arc oxidation product is placed in an electrolyte solution at a preset temperature, and the stable open-circuit potential of the micro-arc oxidation product is obtained through an electrical sensor.

[0052] In practice, an electrolyte solution of a selected concentration is placed in a container made of inert material, and the container is placed in a constant temperature device (e.g., a constant temperature water bath). Subsequently, the electrolyte solution is monitored and actively adjusted in real time to stabilize it within a pre-set target temperature range. Then, the micro-arc oxidation product to be tested is completely immersed in the electrolyte solution that has reached the target temperature to complete the placement of the micro-arc oxidation product. The electrolyte solution can be an acidic sodium chloride solution. In addition, in other embodiments, other electrolyte solutions can also be used, which are not limited here. The set target temperature range can be set according to actual needs, which are not limited here.

[0053] In some embodiments, the stable open-circuit potential of the micro-arc oxidation product is obtained by means of the following steps:

[0054] The micro-arc oxidation product is used as the working electrode, forming a three-electrode system with a preset reference electrode and a preset auxiliary electrode.

[0055] The three-electrode system is immersed in an electrolyte solution at a preset temperature to form a test circuit;

[0056] The electrical sensor is connected to the three-electrode system to construct a potential acquisition path;

[0057] The test circuit is left to stand until the potential drift rate of the working electrode obtained by the potential acquisition path meets the preset stability condition. The potential value at the corresponding time is then used as the stable open circuit potential of the micro-arc oxidation product.

[0058] In practice, firstly, based on the well-known three-electrode testing principle, the micro-arc oxidation product to be tested is used as the working electrode to respond to the test signal. A preset reference electrode with a stable potential reference (such as a saturated calomel electrode) and a preset auxiliary electrode for conducting current (such as a platinum sheet electrode) are selected. These three electrodes are fixed and spaced at a preset distance according to the standard assembly method for electrochemical testing, forming a three-electrode system capable of acquiring electrode potentials. Further details are omitted here. The three-electrode system refers to an electrochemical testing device composed of a working electrode, a reference electrode, and an auxiliary electrode. The working electrode is used to initiate the target electrochemical reaction, the reference electrode provides a stable potential reference, and the auxiliary electrode is used to conduct current to avoid interference with the reference electrode. Electrode polarization; secondly, the assembled three-electrode system is immersed in an electrolyte solution pre-controlled to a preset temperature, ensuring that the effective working areas of the three electrodes are completely covered by the electrolyte solution. The ionic conductivity of the electrolyte solution is used to create a continuous charge transport path between the electrodes, thus forming a test circuit for potential testing. This test circuit is a closed path composed of electrodes, electrolyte solution, and external connection lines, used for transmitting and testing electrical signals. Then, a high-precision potential acquisition type electrical sensor is selected, and according to the standard connection specifications between the electrical sensor and the electrochemical system, the signal input terminal of the electrical sensor is electrically connected to the working electrode and reference electrode in the three-electrode system, respectively. A potential acquisition path is constructed to obtain the potential signal of the working electrode. This potential acquisition path refers to a signal transmission path composed of an electrical sensor, electrodes, and connecting lines, used to transmit the potential signal between the electrodes to the acquisition device. The electrical sensor includes a potential sensor and a current sensor. Finally, the test circuit is left stationary until the potential drift rate of the working electrode acquired by the potential acquisition path meets a preset stability condition. The potential value at the corresponding moment is then taken as the stable open-circuit potential of the micro-arc oxidation product. That is, the test circuit is left stationary while the potential data of the working electrode is acquired in real time through the potential acquisition path. The continuously acquired potential data is processed using a sliding window method, i.e., a fixed window is selected. A time window of a certain length is used to calculate the difference between the maximum and minimum potential values ​​within each window as the potential drift amount for that time window. The potential drift amount is then divided by the duration of the corresponding time window to obtain the potential drift rate. The potential drift rate is continuously monitored until it meets a preset stability condition. The potential value collected at that moment is then determined as the stable open-circuit potential of the micro-arc oxidation product. The preset stability condition refers to the determination process where the potential drift rate is less than a potential drift rate threshold. The potential drift rate threshold can be set according to actual needs. The potential drift rate is a parameter used in electrochemical testing to measure the stability of electrode potential, specifically the rate of change of electrode potential over time within a preset time interval.

[0059] It should be noted that the stable open-circuit potential in this application refers to the stable potential value of the electrode after the electrode of the micro-arc oxidation product reaches a thermodynamic equilibrium state. In the corrosion resistance test of the micro-arc oxidation product, determining the stable open-circuit potential can provide a potential benchmark under thermodynamic equilibrium state for subsequent electrochemical testing and corrosion performance evaluation. The stable open-circuit potential directly reflects the interfacial thermodynamic stability state between the micro-arc oxidation coating and the base metal in the preset electrolyte solution. If the coating is dense and without defects, the stable open-circuit potential will be closer to the characteristic potential of the coating material. Conversely, it is easily affected by the potential of the base metal and deviates. This stable open-circuit potential provides an accurate starting point for subsequent linear potential scanning and avoids distortion in the extraction of the inflection point of the anodic current due to the deviation of the starting potential.

[0060] In step S102, starting from the stable open-circuit potential, a linear potential signal scanning from the cathode region to the anode region is applied to the micro-arc oxidation product, and a current density versus potential relationship spectrum is constructed during the potential signal scanning process. Then, the current inflection point of the micro-arc oxidation coating corresponding to the micro-arc oxidation product in the anode region is extracted from the relationship spectrum.

[0061] In some embodiments, reference Figure 2 As shown, this figure is an exemplary flowchart of determining the relationship spectrum according to some embodiments of this application. In this embodiment, starting from the stable open-circuit potential, a linear potential signal scanning from the cathode region to the anode region is applied to the micro-arc oxidation product, and the relationship spectrum between current density and potential is constructed during the potential signal scanning process. This can be achieved by the following steps:

[0062] In step S1021, the starting potential of the linear potential scan is set to a stable open-circuit potential, and the scan rate is set.

[0063] In step S1022, a linear potential signal is applied to the micro-arc oxidation product via an electrochemical workstation based on the initial potential and the scan rate.

[0064] In step S1023, during the scanning process of applying the linear potential signal, the real-time potential value and the corresponding real-time current value of the micro-arc oxidation product are simultaneously acquired.

[0065] In step S1024, the real-time current density is calculated based on the real-time current value and the test area of ​​the micro-arc oxidation product, and the real-time current density is correlated with the corresponding real-time potential value to construct a graph of the relationship between current density and potential.

[0066] In specific implementation, firstly, the stable open-circuit potential is set as the starting potential for linear potential scanning, and the scanning rate, which is commonly used in the performance testing of micro-arc oxidation products, is selected as the scanning rate for linear potential scanning. The scanning rate refers to the constant rate at which the potential changes with time during linear potential scanning. Secondly, following the standard operating procedure of the electrochemical workstation, the set starting potential and scanning rate parameters are input into the linear scanning voltammetry testing module of the electrochemical workstation. A continuously changing linear potential signal is generated by the signal generator inside the electrochemical workstation, and then transmitted via electrode wires to the working electrode (i.e., the micro-arc oxidation product) in the three-electrode system, thus applying the linear potential signal to the micro-arc oxidation product. The linear potential signal refers to an electrical signal whose potential changes linearly with time, used to gradually excite the electrochemical behavior on the surface of the working electrode. Then, during the entire scanning process of applying the linear potential signal, the potential sensor in the electrical sensor detects the change. The real-time potential value of the working electrode (i.e., the micro-arc oxidation product) is acquired simultaneously, and the real-time current value flowing through the auxiliary electrode is collected through the current sensor in the electrical sensor. Thus, the real-time potential value and the corresponding real-time current value of the micro-arc oxidation product are obtained. During the acquisition process, the clock synchronization module of the electrochemical workstation ensures that the timestamps of each set of potential and current values ​​are completely consistent. The real-time potential value and the corresponding real-time current value refer to the electrode potential and current synchronously acquired at each time node during the scanning process. Finally, the effective surface area (i.e., the test area) of the micro-arc oxidation product participating in the test is accurately measured using a dimensional measuring tool (such as a vernier caliper). According to the standard definition of current density, the corresponding real-time current density is calculated by dividing each real-time current value by the test area. Then, all real-time potential values ​​are used as the abscissa and the corresponding real-time current density is used as the ordinate to generate a continuous two-dimensional curve, which is then used as a graph of the relationship between current density and potential.

[0067] It should be noted that the current density versus potential graph in this application refers to an electrochemical curve plotted with potential as the abscissa and current density as the ordinate. It can intuitively reflect the current response characteristics of the electrode at different potentials. In the corrosion resistance test of micro-arc oxidation products, determining the current density versus potential graph can provide intuitive and quantitative technical basis for the analysis of coating electrochemical behavior and the extraction of key protective performance parameters. The graph can effectively present the dynamic response law of current density with potential during the potential scan of micro-arc oxidation products from the cathode region to the anode region. It can not only clearly reflect the electrochemical reaction characteristics of the coating in different potential ranges, but also provide direct data support for the accurate extraction of the current inflection point in the anode region.

[0068] In some embodiments, the current inflection point of the micro-arc oxidation coating corresponding to the micro-arc oxidation product in the anode region is extracted from the relationship graph using the following steps:

[0069] The potential range corresponding to the micro-arc oxidation coating of the micro-arc oxidation product in the anodic region is determined from the relationship diagram.

[0070] The first derivative of the relationship spectrum corresponding to the potential range is calculated to obtain the slope distribution of the current density as a function of potential.

[0071] Potential points whose rate of change exceeds a set rate of change threshold are selected from the slope distribution, and these potential points are marked as the current inflection points of the micro-arc oxidation coating in the anode region.

[0072] In specific implementation, firstly, based on the electrochemical characteristics (i.e., the potential initiation range of the anodic oxidation reaction) of the micro-arc oxidation product's corresponding micro-arc oxidation coating and the trend of current density change in the relationship spectrum, the cathode reduction region and potential-independent regions are excluded to define a potential range that only includes the anodic oxidation reaction. Specifically, using the anodic active dissolution potential of the uncoated substrate in the same electrolyte solution as a benchmark, the potential at which the current density in the relationship spectrum begins to show a significant upward trend from a flat state is identified as the anodic initiation potential, and the potential at which the current density reaches the test safety upper limit is identified as the anodic termination potential. Then, the potential range between the anodic initiation potential and the anodic termination potential is defined as the potential range corresponding to the micro-arc oxidation coating of the micro-arc oxidation product in the anodic region. This potential range refers to the potential segment in the relationship spectrum where the current density exhibits a characteristic response to potential changes during the anodic oxidation reaction of the micro-arc oxidation coating. Secondly, the central difference method in numerical differentiation algorithms is used to perform a first derivative on the relationship spectrum corresponding to the potential range. The calculation involves selecting multiple data points adjacent to each potential point and calculating the slope of the current density as a function of potential at each potential point using the central difference formula ((current density of the next data point - current density of the previous data point) / (potential of the next data point - potential of the previous data point)). The slope values ​​of all potential points are then arranged in potential order to form a slope distribution of current density as a function of potential. This slope distribution refers to the set of slopes of the current density-potential curves corresponding to each potential point within the potential range of the anodic region, reflecting the rate of change of current density with potential. Finally, based on the electrochemical response data of the blank substrate (uncoated substrate of the same material) of the micro-arc oxidation coating in the same electrolyte solution, a reasonable threshold for the rate of change of slope is set according to actual needs. The rate of change of slope is calculated by subtracting the slope values ​​of adjacent potential points in the slope distribution. Potential points with a rate of change of slope exceeding the threshold are selected and used as the inflection point of the current in the anodic region of the micro-arc oxidation coating.

[0073] It should be noted that, in this application, the current inflection point refers to the potential point where the slope of the current density change with potential in the anodic region of the micro-arc oxidation coating in the micro-arc oxidation product changes abruptly. The current inflection point corresponds to the critical potential position where the micro-arc oxidation coating transitions from a stable protective state to the initiation state of oxidation failure. In the corrosion resistance test of micro-arc oxidation products, determining the current inflection point can accurately locate the critical electrochemical node where the micro-arc oxidation coating transitions from a stable protective state to the initiation state of anodic oxidation failure. This can effectively solve the technical problem of difficulty in quantifying the initiation threshold of coating protection failure in traditional corrosion resistance tests. The potential and current density values ​​corresponding to the current inflection point directly reflect the coating's density, defect degree, and isolation and protection capability against the base metal. If the coating is dense and has no obvious defects, the current inflection point will show a higher critical potential and a lower critical current density; conversely, the inflection point potential will shift and the current density will increase.

[0074] In step S103, a coating integrity factor characterizing the micro-arc oxidation coating is determined based on the potential and current density value corresponding to the current inflection point, and a target environmental acceleration spectrum for corrosion is extracted from multiple predefined environmental acceleration spectra according to the coating integrity factor.

[0075] In some embodiments, the coating integrity factor characterizing the micro-arc oxidation coating is determined based on the potential and current density value corresponding to the current inflection point using the following steps:

[0076] Obtain the reference critical potential and reference critical current density corresponding to the substrate of the same material as the micro-arc oxidation product and without coating;

[0077] Calculate the potential deviation between the potential value corresponding to the current inflection point and the reference critical potential, and the current density deviation between the current density corresponding to the current inflection point and the reference critical current density.

[0078] Based on the potential deviation value and the current density deviation value, the coating integrity factor characterizing the micro-arc oxidation coating is determined.

[0079] In practice, firstly, an uncoated substrate with the same material as the micro-arc oxidation product is selected. This uncoated substrate is placed in an electrolyte solution with the same parameters as the micro-arc oxidation product test. Electrochemical testing is performed using the same linear potential scanning method as for extracting the current inflection point of the micro-arc oxidation product. The current inflection point of the anodic region is extracted from the obtained current density and potential relationship spectrum of the uncoated substrate. The potential value corresponding to this current inflection point is set as the reference critical potential, and the corresponding current density value is set as the reference critical current density. The reference critical potential and reference critical current density refer to the critical potential and critical current density of the uncoated substrate with the same material as the micro-arc oxidation product under the same test conditions during the initial stage of active dissolution in the anodic region, and are used as benchmark reference values ​​for evaluating the coating's protective performance. Then, the potential value corresponding to the current inflection point of the micro-arc oxidation product is calculated by subtracting it from the reference critical potential to obtain the potential deviation value. Simultaneously, the current density value corresponding to the current inflection point of the micro-arc oxidation product is compared with the reference critical potential... The difference between the reference critical current density and the reference critical current density is calculated to obtain the current density deviation value. The potential deviation value refers to the numerical deviation between the potential value at the current inflection point of the micro-arc oxidation product and the reference critical potential. The current density deviation value refers to the numerical deviation between the current density value at the current inflection point of the micro-arc oxidation product and the reference critical current density. Finally, a normalized weighted algorithm is used to normalize the potential deviation value and the current density deviation value according to their respective weights on the integrity of the micro-arc oxidation coating (i.e., the weight of the potential deviation value is set based on the ability of the micro-arc oxidation coating to raise the substrate potential, for example, set to 0.45, and the weight of the current density deviation value is set based on the ability of the micro-arc oxidation coating to suppress the substrate dissolution current, for example, set to 0.55, without limitation here). The potential deviation value and the current density deviation value are normalized separately using min-max normalization, and then weighted and summed according to the set weights. The weighted summation result is used as the coating integrity factor characterizing the micro-arc oxidation coating.

[0080] It should be noted that the coating integrity factor in this application refers to the index characterizing the density of the micro-arc oxidation coating corresponding to the micro-arc oxidation product. In the corrosion resistance test of the micro-arc oxidation product, the coating integrity factor objectively presents the isolation and protection effect of the coating on the base metal in a comprehensive numerical form by quantitatively comparing the current inflection point parameter of the micro-arc oxidation coating with the benchmark parameter of the uncoated substrate of the same material. As a key bridge connecting the initial performance of the coating and the accelerated corrosion test conditions, the coating integrity factor can achieve accurate matching between coatings of different protection levels and the environmental acceleration spectrum, and solve the problem of corrosion mechanism deviation caused by the mismatch between test conditions and the actual protection capability of the coating in traditional accelerated corrosion tests.

[0081] In some embodiments, the extraction of the target environmental acceleration spectrum for corrosion from a predefined plurality of environmental acceleration spectra based on the coating integrity factor is achieved through the following steps:

[0082] Obtain the coating integrity factor range corresponding to different preset environmental acceleration spectra;

[0083] The coating integrity factor is compared with each coating integrity factor interval to determine the interval to which the coating integrity factor belongs;

[0084] The environmental acceleration spectrum corresponding to the interval is used as the target environmental acceleration spectrum for corrosion.

[0085] In specific implementation, firstly, the coating integrity factor range corresponding to different environmental acceleration spectra is obtained from the micro-arc oxidation product performance test database. This coating integrity factor range can be pre-set through numerous accelerated corrosion tests on micro-arc oxidation coatings under different environmental acceleration spectra; details are omitted here. The environmental acceleration spectra include temperature, humidity, corrosive medium concentration, and exposure time. The coating integrity factor range refers to the numerical range of integrity factors characterizing the protective capability of the micro-arc oxidation coating, used to establish the correspondence between coating performance and the corrosive environment. The micro-arc oxidation product performance test database refers to a database used to store data related to micro-arc oxidation product performance testing. Secondly, a numerical range of two... The segmentation comparison algorithm first arranges all preset coating integrity factor intervals in order of numerical value. Then, it takes the determined micro-arc oxidation coating integrity factor as the target value and compares the interval boundary values ​​sequentially from the ordered intervals. By judging whether the target value is greater than the lower limit of the interval and less than or equal to the upper limit of the interval, the specific interval to which the coating integrity factor belongs is determined. The interval to which the coating integrity factor belongs refers to the interval in the preset coating integrity factor interval that matches the value of the coating integrity factor to be tested. Finally, according to the one-to-one correspondence between the preset environmental acceleration spectrum and the coating integrity factor interval, the environmental acceleration spectrum corresponding to the determined interval is used as the target environmental acceleration spectrum for corrosion.

[0086] It should be noted that the target environment accelerated spectrum in this application refers to the accelerated corrosion environment parameter combination spectrum that matches the integrity factor of the micro-arc oxidation coating and can accurately simulate the actual corrosion degradation process of the micro-arc oxidation coating. In the corrosion resistance test of micro-arc oxidation products, determining the target environment accelerated spectrum can accurately match the coating integrity factor, which characterizes the coating's protective ability, with the exclusive range of the predefined accelerated spectrum. This makes the corrosion intensity of the target environment accelerated spectrum match the actual protection level of the micro-arc oxidation coating, thus avoiding abnormal corrosion of the coating in non-actual service scenarios due to an overly stringent accelerated spectrum, and also preventing the test cycle from being too long and unable to efficiently reflect the coating degradation law due to an overly mild accelerated spectrum.

[0087] In step S104, the micro-arc oxidation product is placed in a controlled environment chamber for accelerated corrosion exposure based on the target environment acceleration spectrum. After the corrosion exposure is completed, the current degradation point of the micro-arc oxidation coating corresponding to the micro-arc oxidation product in the anodic region is detected by an electrical sensor.

[0088] In some embodiments, the micro-arc oxidation product is subjected to accelerated corrosion exposure treatment in a controlled environment chamber based on the target environment acceleration spectrum, which is achieved by the following steps:

[0089] The target environment acceleration spectrum is analyzed to obtain corrosion parameters, including temperature, humidity, concentration of corrosive medium, and exposure time.

[0090] The operating parameters of the controllable environment chamber are set according to the corrosion parameters.

[0091] Place the micro-arc oxidation product in a controlled environment chamber with pre-set operating parameters;

[0092] Start the controlled environment chamber to perform accelerated corrosion exposure treatment on the micro-arc oxidation product according to the operating parameters until the exposure time is reached.

[0093] It should be noted that the controllable environment chamber in this application refers to a laboratory-specific corrosion testing device with the ability to precisely control multiple parameters. Its core consists of a sealed corrosion chamber, a parameter control system, and functional modules (temperature control module, humidity control module, corrosion medium supply module, timing module, etc.). It can precisely control and dynamically maintain corrosion environment parameters such as temperature, humidity, corrosion medium concentration (such as salt spray concentration, acid / alkaline medium concentration), and exposure period inside the chamber through known technologies such as PID adjustment algorithm and sensor feedback mechanism.

[0094] In practice, firstly, the data processing tool Python is used to read the corrosion parameters from the accelerated corrosion spectrum of the target environment. These corrosion parameters include temperature, humidity, corrosive medium concentration, and exposure time. Corrosion parameters refer to a set of controllable quantifiable indicators used to define the accelerated corrosion environment. Secondly, the obtained corrosion parameters are input one by one into the control system of the controllable environment chamber. Temperature, humidity, and corrosive medium concentration are set through the PID control algorithm of the temperature control module, the humidity sensor feedback control mechanism of the humidity control module, and the flow metering pump control system of the corrosive medium concentration control module, respectively. Simultaneously, a timing program for the exposure time is preset in the control system of the controllable environment chamber, thus forming the operating parameters of the controllable environment chamber. These operating parameters are set to achieve the target corrosion environment. The operating parameters of each functional module of the controlled environment chamber are set. Then, the sealed door of the controlled environment chamber is opened, and the micro-arc oxidation product is fixed on the sample rack inside the chamber using a special sample clamp, ensuring that the test surface of the micro-arc oxidation product is unobstructed and fully exposed to the environment inside the chamber. The space where the micro-arc oxidation product is placed in this position is the controlled environment chamber with the operating parameters set. The controlled environment chamber refers to the sealed cavity inside the environment chamber with the parameters set and the ability to simulate the target corrosion environment. Finally, the controlled environment chamber is started. The controlled environment chamber automatically executes temperature maintenance, humidity adjustment, corrosive medium concentration adjustment and timing program operation according to the preset operating parameters, continuously applying the corrosive environment to the micro-arc oxidation product until the timing program reaches the preset exposure time and then automatically stops.

[0095] It should be noted that the accelerated corrosion exposure treatment in this application refers to the test operation that rapidly induces corrosion degradation of micro-arc oxidation products by simulating an enhanced corrosion environment under controlled laboratory conditions. In the corrosion resistance test of micro-arc oxidation products, the accelerated corrosion exposure treatment based on the target environment acceleration spectrum is intended to solve the technical problems of the long cycle of traditional natural exposure test (which cannot meet the timeliness requirements of rapid iterative evaluation and mass production quality control in the product development stage) and the corrosion mechanism deviating from the actual service scenario due to mismatched acceleration conditions.

[0096] In some embodiments, after corrosion exposure has ended, the detection of the current degradation point of the micro-arc oxidation coating in the anodic region using an electrical sensor is achieved through the following steps:

[0097] The micro-arc oxidation product exposed to corrosion was removed and restored to the preset test temperature, and the three-electrode test system was reconstructed with the reference electrode and auxiliary electrode.

[0098] The electrical sensor is electrically connected to the three-electrode test system to construct a potential scanning monitoring path with parameters consistent with those extracted when the current inflection point is extracted.

[0099] A linear potential signal covering the anode area is applied through the potential scanning monitoring channel, and the real-time potential value and corresponding real-time current density value of the micro-arc oxidation product after corrosion are collected simultaneously.

[0100] Based on the real-time potential value and corresponding real-time current density value of the micro-arc oxidation product after corrosion, a current density-potential relationship spectrum is constructed, and the current degradation point of the micro-arc oxidation coating in the anodic region after corrosion exposure is extracted based on the relationship spectrum.

[0101] In practice, firstly, the micro-arc oxidation product after accelerated corrosion exposure treatment is removed from the controlled environment chamber and placed in a constant temperature environment identical to that at the inflection point of the extraction current before corrosion, allowing it to stand until the preset test temperature is restored (to eliminate the interference of temperature fluctuations on the electrochemical signal). Then, using this micro-arc oxidation product as the working electrode, along with a reference electrode and auxiliary electrode of the same type as those used in the pre-corrosion test, it is fixed using electrode clamps and connected to the electrochemical test circuit, reconstructing a three-electrode test system for monitoring the corrosion resistance of the micro-arc oxidation coating. This three-electrode test system refers to a standardized electrochemical test system composed of a working electrode, a reference electrode, and an auxiliary electrode. Secondly, the signal output terminal of the electrical sensor is electrically connected to the corresponding auxiliary and reference electrodes of the three-electrode test system, and the signal acquisition terminal is electrically connected to the working electrode. Simultaneously, the electrical sensor is set with the same potential scan rate, scan start potential, and termination potential parameters as those at the inflection point of the extraction current before corrosion, constructing a potential scan monitoring path that can reproduce the pre-corrosion test conditions. This potential scan monitoring path refers to the path connecting the electrical sensor and the three-electrode test system for applying potential signals and acquiring electrochemical response signals. The circuit loop is described; then, a continuously changing linear potential signal is generated by the signal generator inside the electrochemical workstation and applied to the potential range of the anodic region defined before corrosion. At the same time, the potential value and the corresponding current density value corresponding to each potential moment after corrosion of the micro-arc oxidation product are recorded, thus obtaining the real-time potential value and the corresponding real-time current density value. The real-time potential value and the corresponding real-time current density value refer to the potential data and the corresponding current density data collected by the micro-arc oxidation product during the potential scanning process after corrosion. Finally, a relationship spectrum between current density and potential is constructed based on the real-time potential value and the corresponding real-time current density value after corrosion of the micro-arc oxidation product. The relationship spectrum is constructed using the same method as the relationship spectrum before corrosion exposure, which will not be elaborated here. Based on the relationship spectrum, the current degradation point of the micro-arc oxidation coating in the anodic region after corrosion exposure is extracted. The current inflection point of the micro-arc oxidation coating in the anodic region after corrosion exposure can be taken as the current degradation point of the micro-arc oxidation coating in the anodic region after corrosion exposure. The current inflection point of the micro-arc oxidation coating in the anodic region after corrosion exposure can be determined by the same method used to determine the current inflection point of the micro-arc oxidation coating in the anodic region before corrosion exposure, which will not be elaborated here.

[0102] It should be noted that, in this application, the current degradation point refers to the potential point where the current density in the anodic region of the micro-arc oxidation coating changes significantly from the current inflection point before corrosion. It is used to characterize the electrochemical node where the protective performance of the micro-arc oxidation coating degrades after accelerated corrosion. Determining the current degradation point can accurately locate the electrochemical node where the protective performance of the micro-arc oxidation coating in the anodic region changes from a stable state to a significantly degraded state after accelerated corrosion. This not only provides accurate electrochemical quantitative basis for assessing the remaining protective capability of micro-arc oxidation products after corrosion and verifying their corrosion resistance level, but also reversely verifies the rationality of the matching between the accelerated spectrum of the target environment and the protective performance of the coating. This ensures the closed-loop nature of the entire corrosion resistance testing system from accelerated corrosion treatment to post-corrosion performance evaluation, thereby improving the scientificity and accuracy of the corrosion resistance performance evaluation results of micro-arc oxidation products.

[0103] In step S105, the corrosion resistance level of the micro-arc oxidation product is determined based on the current inflection point and current degradation point of the micro-arc oxidation coating in the anodic region.

[0104] In some embodiments, the corrosion resistance level of the micro-arc oxidation product is determined based on the current inflection point and current degradation point of the corresponding micro-arc oxidation coating in the anodic region using the following steps:

[0105] Extract the potential value and current density value corresponding to the current inflection point and the current degradation point of the micro-arc oxidation coating in the anodic region;

[0106] Calculate the potential shift and current density decay rate between the current degradation point and the current inflection point;

[0107] Obtain the potential offset threshold range and current density attenuation rate threshold range corresponding to different corrosion resistance grades;

[0108] The calculated potential offset and current density attenuation rate are matched with the threshold range corresponding to each corrosion resistance level. The corrosion resistance level corresponding to the successfully matched threshold range is determined as the corrosion resistance level of the micro-arc oxidation product.

[0109] In specific implementation, firstly, the potential value and current density value corresponding to the current inflection point and the current degradation point of the micro-arc oxidation coating in the anodic region are extracted; secondly, the potential value corresponding to the current degradation point and the potential value corresponding to the current inflection point are calculated by difference to obtain the potential offset between the current degradation point and the current inflection point. Simultaneously, the current density decay rate is calculated using the formula (current density value corresponding to the current inflection point - current density value corresponding to the current degradation point) / current density value corresponding to the current inflection point × 100%. The potential offset refers to the potential shift between the current degradation point and the current inflection point in the anodic region after accelerated corrosion of the micro-arc oxidation coating. The current density decay rate is an indicator characterizing the decay of the current density in the anodic region after accelerated corrosion of the micro-arc oxidation coating. The potential offset reflects the change range of the coating's critical protective potential, and the current density decay rate reflects the degree of decrease in the coating's ability to inhibit substrate dissolution current. Then, based on the industry corrosion level standards for the application field of micro-arc oxidation products, combined with the large... Accelerated corrosion test data of micro-arc oxidation products with different protection levels were collected. Statistical analysis methods (such as interval partitioning algorithms) were used to determine the potential offset threshold range and current density decay rate threshold range corresponding to each corrosion resistance level. The potential offset threshold range refers to a pre-set range of potential offset parameters used to define different corrosion resistance levels, and the current density decay rate threshold range refers to a pre-set range of current density decay rate parameters used to define different corrosion resistance levels. Each level corresponds to a unique combination of threshold ranges. Finally, using an existing interval matching algorithm, the calculated potential offset was compared one by one with the potential offset threshold range corresponding to each corrosion resistance level. Simultaneously, the calculated current density decay rate was compared with the corresponding current density decay rate threshold range. When both fall within the threshold range corresponding to the same corrosion resistance level, a successful match was determined. The corrosion resistance level corresponding to the successfully matched threshold range was then taken as the corrosion resistance level of the micro-arc oxidation product.

[0110] It should be noted that the corrosion resistance rating in this application refers to a rating that characterizes the ability of micro-arc oxidation products to resist corrosive environments and is used to assess the corrosion protection performance level of micro-arc oxidation products.

[0111] In another aspect, in some embodiments, this application provides a performance testing system for micro-arc oxidation products, with reference to... Figure 3 The figure is a schematic diagram of the structure of a performance testing system for micro-arc oxidation products according to some embodiments of this application. The performance testing system for micro-arc oxidation products includes: an acquisition module 201, a processing module 202, and an execution module 203, which are described below:

[0112] The acquisition module 201 in this application is mainly used to place the micro-arc oxidation product in an electrolyte solution at a preset temperature and acquire the stable open circuit potential of the micro-arc oxidation product through an electrical sensor.

[0113] Processing module 202, in this application, is mainly used to apply a linear potential signal scanning from the cathode region to the anode region on the micro-arc oxidation product, starting from the stable open circuit potential, and to construct a current density-potential relationship spectrum during the potential signal scanning process, and then extract the current inflection point of the micro-arc oxidation coating in the anode region of the micro-arc oxidation product from the relationship spectrum.

[0114] The processing module 202 is further configured to determine the coating integrity factor characterizing the micro-arc oxidation coating based on the potential and current density value corresponding to the current inflection point, and extract the target environmental acceleration spectrum for corrosion from a number of predefined environmental acceleration spectra based on the coating integrity factor.

[0115] In addition, the processing module 202 is also used to place the micro-arc oxidation product in a controlled environment chamber for accelerated corrosion exposure treatment based on the target environment acceleration spectrum, and after the corrosion exposure is completed, detect the current degradation point of the micro-arc oxidation coating corresponding to the micro-arc oxidation product in the anode area by an electrical sensor.

[0116] The execution module 203 in this application is mainly used to determine the corrosion resistance level of the micro-arc oxidation product based on the current inflection point and current degradation point of the micro-arc oxidation coating in the anodic region.

[0117] In addition, this application also provides a computer device, the computer device including a memory and a processor, the memory storing code, and the processor being configured to acquire the code and execute the above-described performance testing method for micro-arc oxidation products.

[0118] In some embodiments, reference Figure 4 The figure is a schematic diagram of the structure of a computer device for implementing a performance testing method for micro-arc oxidation products according to some embodiments of this application. The performance testing method for micro-arc oxidation products in the above embodiments can be achieved through... Figure 4 The computer device shown is used to implement this, and the computer device includes at least one processor 301, a communication bus 302, a memory 303, and at least one communication interface 304.

[0119] The processor 301 may be a general-purpose central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more devices used to control the execution of performance testing methods for the micro-arc oxidation products in this application.

[0120] The communication bus 302 can be used to transmit information between the aforementioned components.

[0121] The memory 303 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disks or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. The memory 303 may exist independently and be connected to the processor 301 via the communication bus 302. The memory 303 may also be integrated with the processor 301.

[0122] The memory 303 stores program code for executing the scheme of this application, and its execution is controlled by the processor 301. The processor 301 executes the program code stored in the memory 303. The program code may include one or more software modules. In the above embodiments, the determination of the performance testing method of the micro-arc oxidation product can be implemented by the processor 301 and one or more software modules in the program code in the memory 303.

[0123] Communication interface 304 uses any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.

[0124] In a specific implementation, as one example, a computer device may include multiple processors, each of which may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. Here, a processor may refer to one or more devices, circuits, and / or processing cores used to process data (e.g., computer program instructions).

[0125] The aforementioned computer device can be a general-purpose computer device or a special-purpose computer device. In specific implementations, the computer device can be a desktop computer, a portable computer, a network server, a handheld digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, a communication device, or an embedded device. This application does not limit the type of computer device.

[0126] In addition, this application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described performance testing method for micro-arc oxidation products.

[0127] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0128] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A performance testing method for micro-arc oxidation products, characterized in that, Includes the following steps: The micro-arc oxidation product is placed in an electrolyte solution at a preset temperature, and the stable open-circuit potential of the micro-arc oxidation product is obtained through an electrical sensor. Starting from the stable open circuit potential, a linear potential signal scanning from the cathode region to the anode region is applied to the micro-arc oxidation product, and a current density versus potential relationship spectrum is constructed during the potential signal scanning process. Then, the current inflection point of the micro-arc oxidation coating in the anode region of the micro-arc oxidation product is extracted from the relationship spectrum. Specifically, extracting the current inflection point in the anodic region corresponding to the micro-arc oxidation coating of the micro-arc oxidation product from the relationship graph includes: From the relationship graph, the potential range corresponding to the micro-arc oxidation coating of the micro-arc oxidation product in the anode region is defined; the first derivative of the relationship graph corresponding to the potential range is calculated to obtain the slope distribution of the current density as a function of potential; potential points with a rate of change exceeding a set rate of change threshold are selected from the slope distribution and marked as the current inflection point of the micro-arc oxidation coating in the anode region. Based on the potential and current density value corresponding to the current inflection point, the coating integrity factor characterizing the micro-arc oxidation coating is determined, and the target environmental acceleration spectrum for corrosion is extracted from multiple predefined environmental acceleration spectra according to the coating integrity factor. Specifically, determining the coating integrity factor characterizing the micro-arc oxidation coating based on the potential and current density value corresponding to the current inflection point includes: Obtain the reference critical potential and reference critical current density corresponding to the substrate of the same material as the micro-arc oxidation product and without coating; calculate the potential deviation between the potential value corresponding to the current inflection point and the reference critical potential, and the current density deviation between the current density corresponding to the current inflection point and the reference critical current density; based on the potential deviation and the current density deviation, determine the coating integrity factor characterizing the micro-arc oxidation coating. Based on the target environment acceleration spectrum, the micro-arc oxidation product is placed in a controlled environment chamber for accelerated corrosion exposure treatment. After the corrosion exposure is completed, the current degradation point of the corresponding micro-arc oxidation coating in the anodic region is detected by an electrical sensor. The corrosion resistance level of the micro-arc oxidation product is determined based on the current inflection point and current degradation point of the corresponding micro-arc oxidation coating in the anodic region.

2. The method as described in claim 1, characterized in that, Obtaining the stable open-circuit potential of the micro-arc oxidation product using an electrical sensor specifically includes: The micro-arc oxidation product is used as the working electrode, forming a three-electrode system with a preset reference electrode and a preset auxiliary electrode. The three-electrode system is immersed in an electrolyte solution at a preset temperature to form a test circuit; The electrical sensor is connected to the three-electrode system to construct a potential acquisition path; The test circuit is left to stand until the potential drift rate of the working electrode obtained by the potential acquisition path meets the preset stability condition. The potential value at the corresponding time is then used as the stable open circuit potential of the micro-arc oxidation product.

3. The method as described in claim 1, characterized in that, Starting from the stable open-circuit potential, a linear potential signal scanning from the cathode region to the anode region is applied to the micro-arc oxidation product, and the relationship between current density and potential is constructed during the potential signal scanning process, specifically including: Set the starting potential of the linear potential scan to a stable open-circuit potential, and set the scan rate; Based on the initial potential and the scan rate, a linear potential signal is applied to the micro-arc oxidation product via an electrochemical workstation; During the scanning process of applying a linear potential signal, the real-time potential value and corresponding real-time current value of the micro-arc oxidation product are simultaneously acquired. The real-time current density is calculated based on the real-time current value and the test area of ​​the micro-arc oxidation product, and the real-time current density is correlated with the corresponding real-time potential value to construct a graph of the relationship between current density and potential.

4. The method as described in claim 1, characterized in that, Based on the coating integrity factor, the target environmental acceleration spectrum for corrosion is extracted from multiple predefined environmental acceleration spectra, specifically including: Obtain the coating integrity factor range corresponding to different preset environmental acceleration spectra; The coating integrity factor is compared with each coating integrity factor interval to determine the interval to which the coating integrity factor belongs; The environmental acceleration spectrum corresponding to the interval is used as the target environmental acceleration spectrum for corrosion.

5. The method as described in claim 1, characterized in that, The electrical sensor includes a potential sensor and a current sensor.

6. A performance testing system for micro-arc oxidation products, used to perform the performance testing method for micro-arc oxidation products as described in any one of claims 1 to 5, characterized in that, The system includes: The acquisition module is used to place the micro-arc oxidation product in an electrolyte solution at a preset temperature and acquire the stable open-circuit potential of the micro-arc oxidation product through an electrical sensor. The processing module is used to apply a linear potential signal that scans from the cathode region to the anode region on the micro-arc oxidation product, starting from the stable open circuit potential, and to construct a current density versus potential graph during the potential signal scanning process, and then extract the current inflection point of the micro-arc oxidation coating in the anode region of the micro-arc oxidation product from the graph. The processing module is also used to determine the coating integrity factor characterizing the micro-arc oxidation coating based on the potential and current density value corresponding to the current inflection point, and to extract the target environmental acceleration spectrum for corrosion from a number of predefined environmental acceleration spectra based on the coating integrity factor. The processing module is also used to place the micro-arc oxidation product in a controlled environment chamber for accelerated corrosion exposure treatment based on the target environment acceleration spectrum, and after the corrosion exposure is completed, detect the current degradation point of the micro-arc oxidation coating corresponding to the micro-arc oxidation product in the anode area by an electrical sensor. The execution module is used to determine the corrosion resistance level of the micro-arc oxidation product based on the current inflection point and current degradation point of the micro-arc oxidation coating in the anodic region.

7. A computer device, characterized in that, The computer device includes a memory and a processor, the memory storing code, and the processor being configured to retrieve the code and execute the performance testing method for the micro-arc oxidation product as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the performance testing method for the micro-arc oxidation product as described in any one of claims 1 to 5.

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