Galvanic corrosion risk assessment method and device for dissimilar metal lap joint structure
By constructing a polarization curve library and calculating galvanic corrosion risk using mixed potential theory, the problem of low efficiency in assessing galvanic corrosion risk of dissimilar metal lap joint structures in existing technologies is solved, and rapid and accurate risk assessment is achieved.
Patent Information
- Application Number
- CN202511797662.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-01
- Publication Date
- 2026-03-03
AI Technical Summary
Existing technologies for assessing the risk of galvanic corrosion in dissimilar metal lap joint structures are inefficient and the assessment results are not accurate enough.
By constructing a polarization curve library, standard polarization curves of various metal materials in the power system of aerospace equipment are obtained, the anode and cathode materials of galvanic couples with dissimilar metal overlap structures are determined, and the galvanic corrosion current density and target corrosion rate are calculated based on the standard polarization curves. Combining the mixed potential theory and Faraday's formula, the risk of galvanic corrosion can be quickly assessed.
It improves the efficiency and accuracy of galvanic corrosion risk assessment, simplifies the assessment process, reduces costs, and provides reliable corrosion risk assessment data support.
Smart Images
Figure CN121595435A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of corrosion protection technology, and in particular to a method and apparatus for assessing the risk of galvanic corrosion in dissimilar metal lap joint structures. Background Technology
[0002] As aviation equipment expands its deployment into marine environments, its power systems face increasingly stringent challenges from the marine atmospheric environment. The corrosion compatibility of the power system in the marine environment directly affects the safety and service life of the entire aircraft. Galvanic corrosion induced by the use of dissimilar metals in the power system is a significant source of corrosion risk. Therefore, timely identification and quantitative assessment of the galvanic corrosion risk at dissimilar metal connection points in the power system are crucial for controlling overall corrosion risk and improving the adaptability of the power system in the marine environment. Related technologies include: 1. Conducting galvanic corrosion tests and assessing the risk based on the test results; 2. Constructing a galvanic corrosion simulation model and assessing the risk through the simulation model; 3. Conducting a theoretical analysis of the metal polarization curves to assess the galvanic corrosion risk.
[0003] However, the methods used in related technologies for assessing the risk of galvanic corrosion are inefficient. Summary of the Invention
[0004] This application provides a method and apparatus for assessing the galvanic corrosion risk of dissimilar metal lap joint structures, so as to at least solve the problem of low efficiency in the related art of assessing the galvanic corrosion risk.
[0005] This application provides a method for assessing the galvanic corrosion risk of dissimilar metal lap joint structures, including: Obtain the standard polarization curves of each of the various metallic materials used in the power system design of aerospace equipment to form a polarization curve library; Determine the first and second metal materials that constitute the dissimilar metal lap joint structure to be evaluated; Obtain the first standard polarization curve of the first metallic material and the second standard polarization curve of the second metallic material from the polarization curve library; Based on the first and second standard polarization curves, the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be evaluated is determined. Based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated, the target corrosion rate of the galvanic anode metal material is determined. Based on the target corrosion rate of the galvanic anolyte material, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is determined.
[0006] This application also provides a device for assessing the risk of galvanic corrosion of dissimilar metal lap joint structures, comprising: The first acquisition module is used to acquire the standard polarization curve of each of the various metal materials used in the power system design of aerospace equipment, so as to form a polarization curve library; The first determining module is used to determine the first metal material and the second metal material constituting the dissimilar metal lap structure to be evaluated. The second acquisition module is used to acquire the first standard polarization curve of the first metallic material and the second standard polarization curve of the second metallic material from the polarization curve library; The second determination module is used to determine the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be evaluated based on the first standard polarization curve and the second standard polarization curve. The third determination module is used to determine the target corrosion rate of the galvanic anode metal material based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated. The fourth determination module is used to determine the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated based on the target corrosion rate of the galvanic anode metal material.
[0007] This application also provides an electronic device, including: a memory for storing a computer program; and a processor for executing the computer program to implement the steps of the galvanic corrosion risk assessment method for any of the dissimilar metal lap structures described above.
[0008] This application also provides a computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, it implements the steps of the galvanic corrosion risk assessment method for any of the above-described dissimilar metal lap joint structures.
[0009] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the galvanic corrosion risk assessment method for any of the above-described dissimilar metal lap joint structures.
[0010] This application addresses the issue of low efficiency in galvanic corrosion risk assessment by utilizing standard polarization curves to determine the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be evaluated. Specifically, it involves obtaining standard polarization curves for each of various metallic materials used in the design of power systems for aerospace equipment, constructing a polarization curve library; identifying the first and second metallic materials constituting the dissimilar metal lap structure to be evaluated; obtaining the first standard polarization curve and the second standard polarization curve from the polarization curve library; determining the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be evaluated based on the first and second standard polarization curves; determining the target corrosion rate of the galvanic anode metal material based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated; and determining the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated based on the target corrosion rate. This method effectively improves the efficiency of galvanic corrosion risk assessment by using standard polarization curves to determine the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be evaluated, thereby determining the target corrosion rate and the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated. Attached Figure Description
[0011] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0012] Figure 1 A flowchart illustrating a method for assessing the galvanic corrosion risk of a dissimilar metal lap joint structure provided in this application embodiment; Figure 2 A flowchart illustrating the galvanic corrosion risk assessment method for another dissimilar metal lap joint structure provided in this application embodiment; Figure 3 A schematic diagram illustrating the plotting of the first and second standard polarization curves in the same coordinate system, provided for embodiments of this application; Figure 4 A flowchart illustrating the galvanic corrosion risk assessment method for another dissimilar metal lap joint structure provided in this application embodiment; Figure 5 A schematic diagram of the standard polarization curves of Q235 steel and nickel-based alloy K550 in the same coordinate system provided for embodiments of this application; Figure 6 A schematic diagram of the galvanic corrosion risk assessment device for a dissimilar metal lap joint structure provided in an embodiment of this application; Figure 7Schematic structural diagram of the electronic device provided by the embodiment of the present application. Detailed implementation manners
[0013] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.
[0014] It should be noted that in the description of the present application, the terms "include", "comprise" or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. The terms "first", "second", etc. in the present application are used to distinguish similar objects and not to describe a specific order or sequence.
[0015] In order to enable those skilled in the art of the present technology to better understand the solution of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners.
[0016] With the implementation of the deep-sea and far-sea strategy, aviation equipment such as airplanes and helicopters has gradually advanced into the marine environment, and the service locations have changed from inland to coastal areas, ships, islands, overseas escort bases, etc. The power systems supporting them are increasingly severely tested by the marine atmospheric environment. The corrosion compatibility of the complex materials and structural systems of the power system in the marine environment directly affects the service safety and service life of the whole machine. Among the corrosion risks of the power system in the marine atmospheric environment, the galvanic corrosion effect induced by the lap joint of dissimilar metals is one of the important corrosion risk sources and an important cause and weak link leading to the corrosion damage of the power system. It can be understood that when designing the power system, in order to meet the structural and performance requirements, there are inevitably a large number of cases of contact use of dissimilar metals. When the structures and components composed of dissimilar metals are exposed to an electrolyte environment (such as seawater, thin liquid film, etc.), the galvanic corrosion effect of dissimilar metals will be induced, greatly accelerating the corrosion dissolution rate of the component with a lower potential (the galvanic anode component). Therefore, the lap joint use of dissimilar metals is one of the main corrosion risk sources of the power system in the current marine environment.
[0017] Timely and rapid identification and quantitative assessment of galvanic corrosion risks at dissimilar metal connection points in power systems are crucial for controlling overall system corrosion risks and improving the marine environmental adaptability of power systems. The most effective approach to addressing the galvanic corrosion risks faced by complex material systems in marine environments is to conduct detailed assessments of the galvanic corrosion risks between different metal materials during the system material selection and design phase, thereby controlling the galvanic corrosion tendency within the power system at its source.
[0018] In related technologies, methods for assessing the galvanic corrosion risk of dissimilar metals include: 1. Conducting galvanic corrosion tests on the dissimilar metals to obtain relevant experimental data such as galvanic current density and corrosion potential difference, and then assessing the risk based on the experimental data. 2. Assessing the galvanic corrosion risk of dissimilar metals through corrosion potential parameters. 3. Constructing a galvanic corrosion simulation model and assessing the galvanic corrosion risk of dissimilar metals through the simulation model. 4. Theoretically analyzing the polarization curves of dissimilar metals to obtain their polarization curve parameters, and then using mixed potential theory to assess the galvanic corrosion risk.
[0019] However, the first method in related technologies is time-consuming and inefficient, and the experimental data obtained is limited. Different structures and components often require repeated testing, which does not facilitate rapid design and results in significant resource waste. The second method suffers from large fluctuations and errors in evaluation results due to the volatility of material corrosion potential, failing to accurately reflect the galvanic corrosion risk of dissimilar metals. The third method is inefficient due to the complexity of establishing galvanic corrosion simulation models, setting boundary conditions, and acquiring experimental parameters. The fourth method is inefficient because the theoretical analysis of polarization curves is complex and it cannot fully consider the influence of the anode-cathode area ratio and the solution resistance in the environment during galvanic corrosion; the results obtained cannot accurately reflect the galvanic corrosion risk of dissimilar metals.
[0020] To address the aforementioned technical problems, this application provides a method and apparatus for assessing the galvanic corrosion risk of dissimilar metal lap structures. The method includes: acquiring standard polarization curves for each of a variety of metal materials used in the design of power systems for aerospace equipment, to form a polarization curve library; determining a first metal material and a second metal material constituting the dissimilar metal lap structure to be assessed; acquiring a first standard polarization curve for the first metal material and a second standard polarization curve for the second metal material from the polarization curve library; determining the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be assessed based on the first and second standard polarization curves; determining the target corrosion rate of the galvanic anode metal material based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be assessed; and determining the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be assessed based on the target corrosion rate of the galvanic anode metal material. The method provided by the above scheme starts from the mature mixed potential theory of galvanic corrosion. It can determine the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal overlap structure to be evaluated by using the standard polarization curve of the repeatability of the metal material. Then, the target corrosion rate is determined. Based on the target corrosion rate, the galvanic corrosion risk assessment result of the dissimilar metal overlap structure to be evaluated is determined. Therefore, it can solve the technical problem of low efficiency in the galvanic corrosion risk assessment method in related technologies, and achieve the technical effects of improving the efficiency of galvanic corrosion risk assessment, reducing costs, and accurately reflecting the galvanic corrosion risk of dissimilar metal overlap structures.
[0021] Embodiments of this application provide a method for assessing the galvanic corrosion risk of dissimilar metal lap joint structures, applicable to servers. Figure 1 This is a flowchart illustrating the galvanic corrosion risk assessment method for dissimilar metal lap joint structures provided in this application embodiment, as shown below. Figure 1 As shown, the galvanic corrosion risk assessment method for this dissimilar metal lap joint structure includes the following steps: Step S101: Obtain the standard polarization curve of each of the various metal materials used in the power system design of aerospace equipment to form a polarization curve library.
[0022] Among these, aviation equipment can be airplanes, helicopters, etc. The power system can be an engine.
[0023] Specifically, standard polarization curves for each metallic material are obtained using the standardized testing requirements shown in Table 1. It is understood that these standard polarization curves are reusable.
[0024] Table 1
[0025] It should be noted that the standard polarization curve is the polarization curve obtained by testing according to the above-mentioned standardized test requirements under the condition that the exposed area of all metal materials is the same.
[0026] The polarization curve library includes standard polarization curves for each of a variety of metallic materials used in the design of propulsion systems for aerospace equipment.
[0027] Step S102: Determine the first metal material and the second metal material that constitute the dissimilar metal lap structure to be evaluated.
[0028] Among them, the dissimilar metal lap structure to be evaluated can be a structure intended for use in the power system of aerospace equipment in a marine atmospheric environment during the material selection and design phase. Technicians select the required dissimilar metal materials from a standard library to form electrical couples in order to determine the dissimilar metal lap structure to be evaluated.
[0029] Step S103: Obtain the first standard polarization curve of the first metallic material and the second standard polarization curve of the second metallic material from the polarization curve library.
[0030] Step S104: Based on the first standard polarization curve and the second standard polarization curve, determine the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal overlap structure to be evaluated.
[0031] Step S105: Determine the target corrosion rate of the galvanic anode metal material based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated.
[0032] Step S106: Based on the target corrosion rate of the galvanic anode metal material, determine the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated.
[0033] The galvanic corrosion risk assessment method for dissimilar metal lap structures provided in this application can determine the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be assessed by using a standard polarization curve, thereby determining the target corrosion rate. Based on the target corrosion rate, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be assessed is determined. Therefore, it can solve the technical problem of low efficiency in galvanic corrosion risk assessment in related technologies and achieve the technical effect of improving the efficiency of galvanic corrosion risk assessment.
[0034] By constructing a polarization curve library, it is possible to quickly obtain galvanic corrosion parameter information between any two materials with standard polarization curves. This is suitable for evaluating materials with complex and unresolvable polarization curves. It eliminates the need for a prior polarization curve quantification and analysis step, and can quickly identify the galvanic corrosion risk between dissimilar metals, thus improving the efficiency of galvanic corrosion risk assessment between dissimilar metals.
[0035] Embodiments of this application provide a method for assessing the galvanic corrosion risk of dissimilar metal lap joint structures, applicable to servers. Figure 2 This is a flowchart illustrating the galvanic corrosion risk assessment method for dissimilar metal lap joint structures provided in this application embodiment, as shown below. Figure 2 As shown, the galvanic corrosion risk assessment method for this dissimilar metal lap joint structure includes the following steps: Step S201: Obtain the standard polarization curve for each of the various metallic materials used in the power system design of aerospace equipment to construct a polarization curve library. See details below. Figure 1 Step S101 of the illustrated embodiment will not be described again here.
[0036] Step S202: Determine the first and second metal materials constituting the dissimilar metal lap joint structure to be evaluated. See details below. Figure 1 Step S102 of the illustrated embodiment will not be described again here.
[0037] Step S203: Obtain the first standard polarization curve of the first metallic material and the second standard polarization curve of the second metallic material from the polarization curve library. For details, please refer to [link to relevant documentation]. Figure 1 Step S103 of the illustrated embodiment will not be described again here.
[0038] Step S204: Based on the first standard polarization curve and the second standard polarization curve, determine the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be evaluated.
[0039] Specifically, step S204 includes: Step S2041: Plot the first standard polarization curve and the second standard polarization curve in the same coordinate system.
[0040] Specifically, the standard polarization curves of the two metallic materials are plotted together using drawing software.
[0041] Figure 3 A schematic diagram illustrating the plotting of the first and second standard polarization curves in the same coordinate system, as provided in the embodiments of this application, is shown below. Figure 3 As shown, the standard polarization curve_material 1 is the first standard polarization curve of the first metallic material, and the standard polarization curve_material 2 is the second standard polarization curve of the second metallic material.
[0042] Understandable Figure 3 This is for illustrative purposes only and is not intended to be limiting.
[0043] Step S2042: Obtain the intersection information of the first standard polarization curve and the second standard polarization curve.
[0044] Intersection information includes current information and potential information. For example... Figure 3 As shown, the current information is the thermocouple current. Potential information refers to the dipole potential. It should be noted that the galvanic current is the standard galvanic corrosion current density.
[0045] Step S2043: Based on the intersection information, determine the horizontal coordinate information in the intersection information as the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated.
[0046] Step S2044: Determine the self-corrosion potential of the first metallic material based on the first standard polarization curve.
[0047] like Figure 3 As shown, the self-corrosion potential of material 1 is... That is, the self-corrosion potential of the first metallic material.
[0048] Step S2045: Determine the self-corrosion potential of the second metallic material based on the second standard polarization curve.
[0049] like Figure 3 As shown, the self-corrosion potential of material 2 is... That is, the self-corrosion potential of the second metallic material.
[0050] It can be seen that the self-corrosion potential of a metallic material is determined based on the intersection of the standard polarization curves of that metallic material.
[0051] It should be noted that, based on the mixed potential theory, information such as self-corrosion potential, standard galvanic corrosion current density, and galvanic potential are determined according to the standard polarization curve.
[0052] Step S2046: Determine the anode metal material of the galvanometer based on the self-corrosion potential of the first metal material and the self-corrosion potential of the second metal material.
[0053] Step S205: Determine the target corrosion rate of the galvanic anode metal material based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated.
[0054] Specifically, step S205 includes: Step S2051: Based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated, determine the target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment.
[0055] In the marine atmospheric environment, the primary corrosion environment faced by the dissimilar metal lap joint structure under evaluation is the atmospheric liquid film environment. The solution resistance in this environment is a key factor influencing the strength of the galvanic effect; therefore, the impact of solution resistance must be considered when conducting galvanic corrosion risk assessment. If a high-resistivity system is considered, the standard galvanic corrosion current density needs to be corrected to obtain the target galvanic corrosion current density, thus correcting for the influence of solution resistance on the galvanic corrosion current density.
[0056] Step S2052: Based on the target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment, determine the standard corrosion rate of the galvanic anode metal material.
[0057] Step S2053: Determine the cathode metal material of the galvanic couple based on the first standard polarization curve and the second standard polarization curve.
[0058] Specifically, based on the first and second standard polarization curves, the self-corrosion potentials of the first and second metallic materials are determined. Based on these self-corrosion potentials, the cathode metallic material of the galvanometer is then determined.
[0059] Based on the self-corrosion potential of the first metallic material and the self-corrosion potential of the second metallic material, the cathode metallic material of the galvanic electrode is determined, including: If the self-corrosion potential of the first metal material is lower than that of the second metal material, the second metal material is determined to be the cathode metal material of the galvanic couple.
[0060] When the self-corrosion potential of the first metallic material is higher than that of the second metallic material, the first metallic material is determined to be the cathode metallic material of the galvanic couple.
[0061] Step S2054: Obtain the exposed area of the cathode metal material and the exposed area of the anode metal material in the dissimilar metal lap structure to be evaluated.
[0062] The exposed area refers to the area in contact with the corrosive medium.
[0063] Step S2055: Based on the standard corrosion rate of the galvanic anode metal material, the exposed area of the galvanic cathode metal material, and the exposed area of the galvanic anode metal material, determine the target corrosion rate of the galvanic anode metal material.
[0064] Step S206: Based on the target corrosion rate of the galvanic anode metal material, determine the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated. For details, please refer to [link to relevant documentation]. Figure 1 Step S106 of the illustrated embodiment will not be described again here.
[0065] The galvanic corrosion risk assessment method for dissimilar metal lap joint structures provided in this application can quickly and accurately determine the galvanic anode metal material and standard galvanic corrosion current density by combining the intersection of two standard polarization curves and the self-corrosion potential. This provides an intuitive and quantitative basis for the galvanic corrosion assessment of dissimilar metal lap joint structures, simplifies the assessment process, and improves the efficiency and reliability of the analysis.
[0066] By combining the characteristics of the atmospheric liquid film environment with the exposed area of the anode and cathode metals, the standard galvanic corrosion current density is converted into a precise target corrosion rate. This takes into account the influence of the actual environment and structural dimensions, improving the pertinence and accuracy of corrosion rate assessment, and providing reliable data support for the corrosion protection and safe use of dissimilar metal overlapping structures.
[0067] In some optional implementations, step S2046 above includes: Step a1: If the self-corrosion potential of the first metal material is lower than that of the second metal material, the first metal material is determined to be an anodic metal material of the galvanometer.
[0068] Step a2: If the self-corrosion potential of the first metal material is higher than that of the second metal material, then the second metal material is determined to be an anodic metal material of the galvanometer.
[0069] In some optional implementations, step S2051 above includes: Step b1: Based on the first formula, determine the target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment. The first formula is:
[0070] in, The target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment is given. The standard galvanic corrosion current density is used to evaluate the dissimilar metal lap joint structure. The resistance of the solution in an atmospheric liquid film environment. denoted as the Tafel slope of the standard polarization curve corresponding to the anodic metal material of the galvanic electrode. denoted as the Tafel slope of the standard polarization curve corresponding to the cathode metal material of the galvanic electrode.
[0071] It should be noted that the solution resistance in an atmospheric liquid film environment is calculated based on the liquid film conductivity measured in the actual environment. The solution resistance is used to correlate the predicted galvanic corrosion parameters from galvanic theory with actual operating conditions.
[0072] In some optional implementations, step S2052 above includes: Step c1: Based on the second formula, determine the standard corrosion rate of the galvanic anolyte metal material. The second formula is:
[0073] in, The standard corrosion rate of the galvanic metal material is given. The target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment is given. This represents the corrosion equivalent weight of the galvanic anode metal material. The density of the anode metal material of the galvanometer. is the Faraday constant; the corrosion equivalent weight of the galvanic anode metal material is determined based on the molar mass and the number of electrons lost of the galvanic anode metal material.
[0074] Understandably, the second formula is Faraday's formula, a core formula for converting the dimension of galvanic corrosion current density into the dimension of corrosion rate. The unit of standard corrosion rate is cm / s. The corrosion equivalent weight of the galvanic anode metal is obtained by dividing the molar mass W of the galvanic anode metal by the number of electrons lost, n. The unit is μA / cm 2 . The unit is g / cm³ 3 The Faraday constant is 96485 C / mol.
[0075] The above step S2055 includes: Step d1: Based on the third formula, determine the target corrosion rate of the galvanic anolyte metal material. The third formula is:
[0076] in, The target corrosion rate for the galvanic metal material. This represents the exposed area of the cathode metal material of the galvanic electrode. This represents the exposed area of the anode metal material of the galvanometer.
[0077] According to the third formula, the increase in the exposed area of the cathode metal material of the galvanic couple can be used to accelerate the corrosion of the anode material. For example, when there is a large cathode and a small anode in an engineering project, the galvanic corrosion effect of the anode material will be enhanced.
[0078] In some optional implementations, step S206 above includes: Step e1: If the target corrosion rate of the galvanic anode metal material is less than the first corrosion rate, determine the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated as the first risk level.
[0079] The galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is the first risk level, indicating that the first metal material and the second metal material constituting the dissimilar metal lap structure to be evaluated are galvanically compatible, and the dissimilar metal lap structure to be evaluated can be used in any environment.
[0080] Step e2: If the target corrosion rate of the galvanic anode metal material is not less than the first corrosion rate and less than the second corrosion rate, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is determined to be the second risk level.
[0081] The galvanic corrosion risk assessment result for the dissimilar metal lap structure to be evaluated is the second risk level, indicating that the first and second metal materials constituting the dissimilar metal lap structure can be used in contact under uncontrolled environments. Uncontrolled environments refer to natural or conventional use environments that have not undergone special interventions (such as strict humidity control, contaminant isolation, and corrosive medium concentration regulation).
[0082] Step e3: If the target corrosion rate of the galvanic anode metal material is not less than the second corrosion rate and less than the third corrosion rate, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is determined to be the third risk level.
[0083] Among them, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is the third risk level, indicating that the first metal material and the second metal material constituting the dissimilar metal lap structure to be evaluated can be used in contact in a dust-free indoor environment.
[0084] Step e4: If the target corrosion rate of the galvanic anode metal material is not less than the third corrosion rate, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is determined to be the fourth risk level.
[0085] Among them, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is the fourth risk level, indicating that protective measures need to be taken to prevent galvanic corrosion when the first metal material and the second metal material constituting the dissimilar metal lap structure to be evaluated are in contact.
[0086] In this system, the first corrosion rate is lower than the second corrosion rate, and the second corrosion rate is lower than the third corrosion rate; the first risk level is lower than the second risk level, the second risk level is lower than the third risk level, and the third risk level is lower than the fourth risk level; the higher the risk level, the higher the risk of galvanic corrosion. The first, second, and third corrosion rates are set by technicians based on experience.
[0087] Table 2 shows the correspondence between the galvanic corrosion risk level and the judgment criteria when the ratio of the exposed area of the galvanic anode metal material to the exposed area of the galvanic cathode metal material is 1:1, without considering solution resistance.
[0088] Table 2
[0089] Embodiments of this application provide a method for assessing the galvanic corrosion risk of dissimilar metal lap joint structures, applicable to servers. Figure 4 This is a flowchart illustrating the galvanic corrosion risk assessment method for dissimilar metal lap joint structures provided in this application embodiment, as shown below. Figure 4 As shown, the galvanic corrosion risk assessment method for this dissimilar metal lap joint structure includes the following steps: Based on standardized testing requirements, standard polarization curves of metallic materials are collected. See the description of step S101 above for details, which will not be repeated here.
[0090] Based on the mixed potential theory, the intersection information of the standard polarization curves of the two metal materials constituting the dissimilar metal lap structure to be evaluated is captured. Refer to steps S2041 to S2042 above, which will not be repeated here.
[0091] Obtain galvanic corrosion parameter information. This galvanic corrosion parameter information includes standard galvanic corrosion current density, self-corrosion potential, and galvanic potential. See the corresponding descriptions above for details, which will not be repeated here.
[0092] Based on Faraday's formula, the standard corrosion rate of the galvanic anolyte metal material is determined, and then the target corrosion rate of the galvanic anolyte metal material is determined. See the descriptions of steps c1 and d1 above for details, which will not be repeated here.
[0093] Based on the target corrosion rate of the galvanic anode metal material and the galvanic corrosion compatibility level assessment standard, the galvanic corrosion risk level of the dissimilar metal lap structure to be evaluated is determined. Refer to the relevant descriptions of steps e1 to e4 above, which will not be repeated here.
[0094] The galvanic corrosion risk assessment method for dissimilar metal lap structures provided in this application starts from the mature mixed potential theory of galvanic corrosion and obtains repeatable standard polarization curves of the metal materials through standard testing methods. The standard galvanic corrosion current density of the dissimilar metal lap structure is identified by the intersection of the standard polarization curves of the two metal materials constituting the lap structure to be assessed. Combining corrosion electrochemistry theory, the influence of the anode-cathode area ratio and solution resistance is further considered. According to Faraday's formula, the galvanic corrosion current density is converted into the target corrosion rate of the anode metal material. Finally, based on the target corrosion rate of the anode metal material, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be assessed is determined. This method only requires the acquisition of standard polarization curves of the metal materials, enabling arbitrary pairing between dissimilar metal materials with standard polarization curves. It quickly identifies the galvanic corrosion risk of dissimilar metal lap structures in engine structures under different anode-cathode area ratios and different natural environmental conditions, and features speed, low cost, and high accuracy.
[0095] By using standardized electrochemical data parameters of engine material corrosion, the risk level of dissimilar metal galvanic corrosion can be rapidly acquired and analyzed based on the mixed potential theory. It also covers the influence analysis of structural factors and environmental factors on the galvanic corrosion process, which improves the efficiency of galvanic corrosion risk assessment and ensures the accuracy of galvanic corrosion risk assessment.
[0096] In one specific embodiment, the first metal material constituting the dissimilar metal lap structure to be evaluated is Q235 steel, and the second metal material is nickel-based alloy K550. Figure 5 This is a schematic diagram of the standard polarization curves of Q235 steel and nickel-based alloy K550 in the same coordinate system, provided for embodiments of this application. Figure 5 As shown, using the mixed potential theory and based on the standard polarization curves of Q235 steel and nickel-based alloy K550, and following steps S104 to S106, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated, composed of Q235 steel and nickel-based alloy K550, is obtained. In this embodiment, the galvanic corrosion risk assessment result is level four, indicating that the dissimilar metal lap structure to be evaluated requires certain protective measures before it can be used.
[0097] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method.
[0098] Embodiments of this application also provide a device for assessing the risk of galvanic corrosion of dissimilar metal lap joint structures, such as... Figure 6 As shown, the galvanic corrosion risk assessment device for dissimilar metal lap joint structures includes: The first acquisition module 601 is used to acquire the standard polarization curve of each of the various metal materials used in the power system design of aerospace equipment, so as to form a polarization curve library.
[0099] The first determining module 602 is used to determine the first metal material and the second metal material constituting the dissimilar metal lap structure to be evaluated.
[0100] The second acquisition module 603 is used to acquire the first standard polarization curve of the first metallic material and the second standard polarization curve of the second metallic material from the polarization curve library.
[0101] The second determining module 604 is used to determine the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal overlap structure to be evaluated based on the first standard polarization curve and the second standard polarization curve.
[0102] The third determination module 605 is used to determine the target corrosion rate of the galvanic anode metal material based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated.
[0103] The fourth determination module 606 is used to determine the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated based on the target corrosion rate of the galvanic anode metal material.
[0104] In some alternative implementations, the second determining module 604 includes: The plotting unit is used to plot the first standard polarization curve and the second standard polarization curve in the same coordinate system.
[0105] The first acquisition unit is used to acquire the intersection information of the first standard polarization curve and the second standard polarization curve.
[0106] The first determining unit is used to determine the abscissa information in the intersection information as the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated, based on the intersection information.
[0107] The second determining unit is used to determine the self-corrosion potential of the first metallic material based on the first standard polarization curve.
[0108] The third determining unit is used to determine the self-corrosion potential of the second metallic material based on the second standard polarization curve.
[0109] The fourth determining unit is used to determine the anode metal material of the galvanometer based on the self-corrosion potential of the first metal material and the self-corrosion potential of the second metal material.
[0110] In some optional implementations, the fourth determining unit includes: The fifth determining unit is used to determine that the first metal material is an anodic metal material when the self-corrosion potential of the first metal material is lower than that of the second metal material.
[0111] The sixth determining unit is used to determine that the second metal material is an anodic metal material when the self-corrosion potential of the first metal material is higher than that of the second metal material.
[0112] In some alternative implementations, the third determining module 605 includes: The seventh determining unit is used to determine the target galvanic corrosion current density of the dissimilar metal lap structure under atmospheric liquid film environment based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated.
[0113] The eighth determination unit is used to determine the standard corrosion rate of the galvanic anode metal material based on the target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment.
[0114] The ninth determining unit is used to determine the cathode metal material of the galvanic couple based on the first standard polarization curve and the second standard polarization curve.
[0115] The second acquisition unit is used to acquire the exposed area of the cathode metal material and the exposed area of the anode metal material in the dissimilar metal lap structure to be evaluated.
[0116] The tenth determining unit is used to determine the target corrosion rate of the galvanic anode metal material based on the standard corrosion rate of the galvanic anode metal material, the exposed area of the galvanic cathode metal material, and the exposed area of the galvanic anode metal material.
[0117] In some optional implementations, the seventh determining unit includes: The eleventh determining unit is used to determine the target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment based on the first formula, which is:
[0118] in, The target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment is given. The standard galvanic corrosion current density is used to evaluate the dissimilar metal lap joint structure. The resistance of the solution in an atmospheric liquid film environment. denoted as the Tafel slope of the standard polarization curve corresponding to the anodic metal material of the galvanic electrode. denoted as the Tafel slope of the standard polarization curve corresponding to the cathode metal material of the galvanic electrode.
[0119] In some optional implementations, the eighth determining unit includes: The twelfth determining unit is used to determine the standard corrosion rate of the galvanic anolyte metal material based on the second formula, which is:
[0120] in, The standard corrosion rate of the galvanic metal material is given. The target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment is given. This represents the corrosion equivalent weight of the galvanic anode metal material. The density of the anode metal material of the galvanometer. is the Faraday constant; the corrosion equivalent weight of the galvanic anode metal material is determined based on the molar mass and the number of electrons lost of the galvanic anode metal material.
[0121] The tenth determining unit includes: The thirteenth determining unit is used to determine the target corrosion rate of the galvanic anode metal material based on the third formula, which is:
[0122] in, The target corrosion rate for the galvanic metal material. This represents the exposed area of the cathode metal material of the galvanic electrode. This represents the exposed area of the anode metal material of the galvanometer.
[0123] In some alternative implementations, the fourth determining module 606 includes: The fourteenth determination unit is used to determine the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated as the first risk level when the target corrosion rate of the galvanic anode metal material is less than the first corrosion rate.
[0124] The fifteenth determining unit is used to determine the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated as the second risk level when the target corrosion rate of the galvanic anode metal material is not less than the first corrosion rate and less than the second corrosion rate.
[0125] The sixteenth determination unit is used to determine the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated as the third risk level when the target corrosion rate of the galvanic anode metal material is not less than the second corrosion rate and less than the third corrosion rate.
[0126] The seventeenth determination unit is used to determine the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated as the fourth risk level, provided that the target corrosion rate of the galvanic anode metal material is not less than the third corrosion rate.
[0127] Among them, the first corrosion rate is less than the second corrosion rate, the second corrosion rate is less than the third corrosion rate; the first risk level is lower than the second risk level, the second risk level is lower than the third risk level, and the third risk level is lower than the fourth risk level; the higher the risk level, the higher the risk of galvanic corrosion.
[0128] For a description of the features of the galvanic corrosion risk assessment device for dissimilar metal lap structure in the corresponding embodiment, please refer to the relevant description of the corresponding embodiment of the galvanic corrosion risk assessment method for dissimilar metal lap structure, which will not be repeated here.
[0129] Embodiments of this application also provide an electronic device, such as... Figure 7 As shown, it includes a processor 701 and a memory 702, the memory 702 storing a computer program, and the processor 701 is configured to run the computer program to perform the steps in the embodiments of the galvanic corrosion risk assessment method for any of the dissimilar metal lap structures described above.
[0130] Embodiments of this application also provide a computer-readable storage medium storing a computer program, wherein the computer program is configured to execute the steps in the embodiments of the galvanic corrosion risk assessment method for any of the dissimilar metal lap structures described above when running.
[0131] In one exemplary embodiment, the aforementioned computer-readable storage medium may include, but is not limited to, various media capable of storing computer programs, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard disk, magnetic disk, or optical disk.
[0132] The embodiments of this application also provide a computer program product, which includes a computer program that, when executed by a processor, implements the steps in the embodiments of the galvanic corrosion risk assessment method for any of the dissimilar metal lap joint structures described above.
[0133] Embodiments of this application also provide another computer program product, including a non-volatile computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps in the embodiments of the galvanic corrosion risk assessment method for any of the dissimilar metal lap structures described above.
[0134] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.
[0135] The foregoing provides a detailed description of the galvanic corrosion risk assessment method and apparatus for dissimilar metal lap joint structures. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of these embodiments are only intended to aid in understanding the method and its core concepts. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.
Claims
1. A method for assessing the risk of galvanic corrosion in dissimilar metal lap joint structures, characterized in that, The method includes: Obtain the standard polarization curves of each of the various metallic materials used in the power system design of aerospace equipment to form a polarization curve library; Determine the first and second metal materials that constitute the dissimilar metal lap joint structure to be evaluated; Obtain the first standard polarization curve of the first metallic material and the second standard polarization curve of the second metallic material from the polarization curve library; Based on the first standard polarization curve and the second standard polarization curve, the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be evaluated is determined. Based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated, the target corrosion rate of the galvanic anode metal material is determined. Based on the target corrosion rate of the galvanic anode metal material, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is determined.
2. The method according to claim 1, characterized in that, The determination of the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be evaluated based on the first standard polarization curve and the second standard polarization curve includes: Plot the first standard polarization curve and the second standard polarization curve in the same coordinate system; Obtain the intersection information of the first standard polarization curve and the second standard polarization curve; Based on the intersection information, the horizontal coordinate information in the intersection information is determined to be the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated. Based on the first standard polarization curve, the self-corrosion potential of the first metallic material is determined; Based on the second standard polarization curve, the self-corrosion potential of the second metallic material is determined; The anode metal material of the galvanometer is determined based on the self-corrosion potential of the first metal material and the self-corrosion potential of the second metal material.
3. The method according to claim 2, characterized in that, The determination of the galvanic anode metal material based on the self-corrosion potential of the first metal material and the self-corrosion potential of the second metal material includes: When the self-corrosion potential of the first metal material is lower than that of the second metal material, the first metal material is determined to be the galvanic anode metal material. If the self-corrosion potential of the first metal material is higher than that of the second metal material, the second metal material is determined to be the galvanic anode metal material.
4. The method according to claim 1, characterized in that, The determination of the target corrosion rate of the galvanic anode metal material based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated includes: Based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated, the target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment is determined. Based on the target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment, the standard corrosion rate of the galvanic anode metal material is determined. Based on the first standard polarization curve and the second standard polarization curve, the cathode metal material of the galvanic electrode is determined; Obtain the exposed area of the cathode metal material and the exposed area of the anode metal material in the dissimilar metal lap structure to be evaluated; The target corrosion rate of the galvanic anode metal material is determined based on the standard corrosion rate of the galvanic cathode metal material and the exposed area of the galvanic anode metal material.
5. The method according to claim 4, characterized in that, The determination of the target galvanic corrosion current density of the dissimilar metal lap structure under atmospheric liquid film environment based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated includes: Based on the first formula, the target galvanic corrosion current density of the dissimilar metal lap structure to be evaluated in an atmospheric liquid film environment is determined. The first formula is: in, The target galvanic corrosion current density of the dissimilar metal lap joint structure to be evaluated in an atmospheric liquid film environment. The standard galvanic corrosion current density is the value of the dissimilar metal lap joint structure to be evaluated. The resistance of the solution in the atmospheric liquid film environment. denoted as the Tafel slope of the standard polarization curve corresponding to the anodic metal material of the galvanic electrode. denoted as the Tafel slope of the standard polarization curve corresponding to the cathode metal material of the galvanic electrode.
6. The method according to claim 4, characterized in that, The determination of the standard corrosion rate of the galvanic anode metal material based on the target galvanic corrosion current density of the dissimilar metal lap structure under atmospheric liquid film environment includes: Based on the second formula, the standard corrosion rate of the galvanic anode metal material is determined. The second formula is: in, The standard corrosion rate of the galvanic anode metal material is given. The target galvanic corrosion current density of the dissimilar metal lap joint structure to be evaluated in an atmospheric liquid film environment. The corrosion equivalent weight of the galvanic anode metal material of the galvanic electrode is given. The density of the anode metal material of the galvanometer is given. The Faraday constant is used; the corrosion equivalent weight of the galvanic anode metal material is determined based on the molar mass and the number of electrons lost of the galvanic anode metal material. The determination of the target corrosion rate of the galvanic anode metal material based on the standard corrosion rate of the galvanic anode metal material, the exposed area of the galvanic cathode metal material, and the exposed area of the galvanic anode metal material includes: Based on the third formula, the target corrosion rate of the galvanic anode metal material is determined, and the third formula is: in, The target corrosion rate of the galvanic anode metal material is given. The exposed area of the cathode metal material of the galvanic electrode is given. The exposed area of the anode metal material of the galvanometer is denoted as .
7. The method according to claim 1, characterized in that, The determination of the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated based on the target corrosion rate of the galvanic anolyte material includes: If the target corrosion rate of the galvanic anode metal material is less than the first corrosion rate, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is determined to be the first risk level. If the target corrosion rate of the galvanic anode metal material is not less than the first corrosion rate and less than the second corrosion rate, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is determined to be the second risk level. If the target corrosion rate of the galvanic anode metal material is not less than the second corrosion rate and less than the third corrosion rate, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is determined to be the third risk level. If the target corrosion rate of the galvanic anode metal material is not less than the third corrosion rate, the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated is determined to be the fourth risk level. Among them, the first corrosion rate is less than the second corrosion rate, the second corrosion rate is less than the third corrosion rate; the first risk level is lower than the second risk level, the second risk level is lower than the third risk level, and the third risk level is lower than the fourth risk level; the higher the risk level, the higher the risk of galvanic corrosion.
8. A device for assessing the risk of galvanic corrosion in a dissimilar metal lap joint structure, characterized in that, include: The first acquisition module is used to acquire the standard polarization curve of each of the various metal materials used in the power system design of aerospace equipment, so as to form a polarization curve library; The first determining module is used to determine the first metal material and the second metal material constituting the dissimilar metal lap structure to be evaluated. The second acquisition module is used to acquire the first standard polarization curve of the first metallic material and the second standard polarization curve of the second metallic material from the polarization curve library; The second determining module is used to determine the standard galvanic corrosion current density of the galvanic anode metal material and the dissimilar metal lap structure to be evaluated based on the first standard polarization curve and the second standard polarization curve. The third determining module is used to determine the target corrosion rate of the galvanic anode metal material based on the standard galvanic corrosion current density of the dissimilar metal lap structure to be evaluated. The fourth determining module is used to determine the galvanic corrosion risk assessment result of the dissimilar metal lap structure to be evaluated based on the target corrosion rate of the galvanic anode metal material.
9. An electronic device, characterized in that, include: Memory, used to store computer programs; A processor, configured to implement the steps of the galvanic corrosion risk assessment method for dissimilar metal lap joint structures as described in any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, wherein when the computer program is executed by a processor, it implements the steps of the galvanic corrosion risk assessment method for dissimilar metal lap structures as described in any one of claims 1 to 7.