A method, system and device for assessing the risk of galvanic corrosion of sealing coatings

Abstract

The present invention relates to the field of corrosion detection technology, and discloses a method, system and device for assessing the risk of galvanic corrosion of sealing coatings. The present invention obtains electrochemical test data on the corrosion potential of the sealing coating system to be assessed, determines the form of galvanic corrosion of the sealing coating system to be assessed based on the electrochemical test data, determines the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form, obtains the galvanic corrosion current between the galvanic anode and the galvanic cathode, and then determines the corrosion risk level of the sealing coating system to be assessed according to the magnitude of the galvanic corrosion current. The present invention assesses the risk level of the sealing coating system to be assessed based on the corrosion potential parameters, and provides a corresponding standard process for risk level assessment, thereby achieving rapid and effective analysis of the galvanic corrosion situation of the sealing coating.

Description

Technical Field

[0001] The present invention relates to the technical field of corrosion detection, and in particular to a method, system and device for assessing the risk of galvanic corrosion of a sealing coating. Background Art

[0002] Abradable sealing coatings (simply referred to as sealing coatings) have extremely wide applications in numerous fields. For example, in the field of aircraft engines, they can effectively reduce the gap between the moving and static parts, achieve air path sealing, thereby improving engine performance and reducing fuel consumption.

[0003] The entire sealing coating system consists of three parts: the surface layer, the connecting layer, and the substrate. Sealing coatings are typically porous, multi-phase, and multi-layered. When used in marine environments, corrosive electrolytes can easily penetrate into the coating, leading to interlayer galvanic corrosion between the surface layer, the connecting layer, and the substrate, or interphase galvanic corrosion between the surface metal base and lubricants (such as graphite).

[0004] Galvanic corrosion can significantly reduce the structural stability of abradable sealing coatings, causing them to powder, fail, or even become unstable and fall off, seriously threatening the operational safety of aircraft engines in marine environments. Therefore, it is necessary to test and evaluate the galvanic corrosion of sealing coatings. However, there is currently a lack of rapid and effective methods for evaluating galvanic corrosion in sealing coatings. Summary of the Invention

[0005] The present invention provides a method, system and device for assessing the risk of galvanic corrosion of a sealing coating, which solve the technical problem of how to quickly and effectively assess the galvanic corrosion situation of a sealing coating.

[0006] A first aspect of the present invention provides a method for assessing the risk of galvanic corrosion of a sealing coating, comprising:

[0007] Obtaining electrochemical test data of the sealing coating system to be evaluated, the electrochemical test data including the corrosion potential of each layer in the sealing coating system to be evaluated, the corrosion potential of each layer when forcedly coupled, and the corrosion potential of the entire sealing coating system to be evaluated;

[0008] Determining the galvanic corrosion form of the sealing coating system to be evaluated based on the electrochemical test data, wherein the galvanic corrosion form includes a first corrosion form, a second corrosion form, and a third corrosion form, wherein the first corrosion form indicates that a ternary galvanic corrosion situation occurs due to the combined action of the surface layer, the connecting layer, and the substrate; the second corrosion form indicates that a binary galvanic corrosion situation occurs between the surface layer and the connecting layer; and the third corrosion form indicates that only surface layer corrosion occurs;

[0009] Determine the corresponding galvanic anode and galvanic cathode according to the galvanic corrosion form of the to-be-evaluated seal coating system, and obtain the galvanic corrosion current between the galvanic anode and the galvanic cathode;

[0010] Determine the corrosion risk level of the to-be-evaluated seal coating system according to the magnitude of the galvanic corrosion current.

[0011] According to an implementable manner of the first aspect of the present invention, let E1 represent the corrosion potential of the surface layer in the to-be-evaluated seal coating system, E2 represent the corrosion potential of the connecting layer in the to-be-evaluated seal coating system, E3 represent the corrosion potential of the base layer in the to-be-evaluated seal coating system, E4 represent the corrosion potential when each layer is forced to be coupled, and E5 represent the corrosion potential of the entire to-be-evaluated seal coating system. The determining the galvanic corrosion form of the to-be-evaluated seal coating system according to the electrochemical test data includes:

[0012] If the difference between E4 and E5 is less than the first preset threshold, determine that the galvanic corrosion form of the to-be-evaluated seal coating system is the first corrosion form;

[0013] If the difference between E4 and E5 is not less than the first preset threshold, and E1 < E5 < E2, determine that the galvanic corrosion form of the to-be-evaluated seal coating system is the second corrosion form;

[0014] If the difference between E4 and E5 is not less than the first preset threshold, and the difference between E5 and E1 is not less than the second preset threshold, determine that the galvanic corrosion form of the to-be-evaluated seal coating system is the third corrosion form.

[0015] According to an implementable manner of the first aspect of the present invention, the determining the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the to-be-evaluated seal coating system includes:

[0016] If the galvanic corrosion form of the to-be-evaluated seal coating system is the first corrosion form, compare the magnitudes of E1, E2, and E3, and use the one with the lowest corrosion potential among E1, E2, and E3 as the galvanic anode.

[0017] According to an implementable manner of the first aspect of the present invention, the determining the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the to-be-evaluated seal coating system further includes:

[0018] If the one with the lowest corrosion potential among E1, E2, and E3 is E2, compare the magnitudes of E1, E2, E3, and E5;

[0019] If only one of E1, E2 and E3 is greater than E5, the one with the highest corrosion potential among E1, E2 and E3 shall be used as the galvanic cathode, and the others shall be used as the galvanic anode; if only one of E1, E2 and E3 is less than E5, the one with the lowest corrosion potential among E1, E2 and E3 shall be used as the galvanic anode, and the others shall be used as the galvanic cathode.

[0020] According to one achievable method of the first aspect of the present invention, determining the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated includes:

[0021] If the galvanic corrosion form of the sealing coating system to be evaluated is the second corrosion form, the surface layer and the connecting layer with the lowest corrosion potential are used as the galvanic anode, and the surface layer and the connecting layer with the highest corrosion potential are used as the galvanic cathode.

[0022] According to a possible implementation of the first aspect of the present invention, it is assumed that g represents the galvanic corrosion current, and determining the corrosion risk level of the sealing coating system to be evaluated according to the magnitude of the galvanic corrosion current includes:

[0023] If i g ≤3.0μA / cm 2 , determining that the corrosion risk level of the sealing coating system to be evaluated is level one risk, which means that the corrosion risk is low and the material is allowed to be used;

[0024] If 3.0μA / cm 2 g ≤10.0μA / cm 2 , determining that the corrosion risk level of the sealing coating system to be evaluated is level 2 risk, which indicates a high corrosion risk and requires anti-corrosion measures to be taken before use;

[0025] If i g >10.0μA / cm 2 , it is determined that the corrosion risk level of the sealing coating system to be evaluated is level three risk, and the level three risk means that the corrosion risk is very high and the material is restricted for use.

[0026] According to one implementation of the first aspect of the present invention, the method further includes:

[0027] If the galvanic corrosion form of the sealing coating system to be evaluated is the third corrosion form, it is determined that the sealing coating system to be evaluated does not have the risk of interlayer galvanic corrosion.

[0028] A second aspect of the present invention provides a sealing coating galvanic corrosion risk assessment system, comprising:

[0029] ​An electrochemistry test data acquisition module, which is used to acquire electrochemistry test data of the seal coating system to be evaluated. The electrochemistry test data includes the corrosion potential of each layer in the seal coating system to be evaluated, the corrosion potential when each layer is forced to be coupled, and the corrosion potential of the entire seal coating system to be evaluated;

[0030] A galvanic corrosion form determination module, which is used to determine the galvanic corrosion form of the seal coating system to be evaluated according to the electrochemistry test data. The galvanic corrosion form includes a first corrosion form, a second corrosion form and a third corrosion form. The first corrosion form indicates that a ternary galvanic corrosion situation occurs due to the combined action of the surface layer, the connecting layer and the substrate. The second corrosion form indicates that a binary galvanic corrosion situation occurs between the surface layer and the connecting layer. The third corrosion form indicates that only surface layer corrosion occurs;

[0031] A galvanic corrosion current acquisition module, which is used to determine the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the seal coating system to be evaluated, and acquire the galvanic corrosion current between the galvanic anode and the galvanic cathode;

[0032] A corrosion risk assessment module, which is used to determine the corrosion risk level of the seal coating system to be evaluated according to the magnitude of the galvanic corrosion current.

[0033] According to an implementable manner of the second aspect of the present invention, let E1 represent the corrosion potential of the surface layer in the seal coating system to be evaluated, E2 represent the corrosion potential of the connecting layer in the seal coating system to be evaluated, E3 represent the corrosion potential of the base layer in the seal coating system to be evaluated, E4 represent the corrosion potential when each layer is forced to be coupled, and E5 represent the corrosion potential of the entire seal coating system to be evaluated. The galvanic corrosion form determination module is specifically used for:

[0034] If the difference between E4 and E5 is less than the first preset threshold, determine that the galvanic corrosion form of the seal coating system to be evaluated is the first corrosion form;

[0035] If the difference between E4 and E5 is not less than the first preset threshold, and E1 < E5 < E2, determine that the galvanic corrosion form of the seal coating system to be evaluated is the second corrosion form;

[0036] If the difference between E4 and E5 is not less than the first preset threshold, and the difference between E5 and E1 is not less than the second preset threshold, determine that the galvanic corrosion form of the seal coating system to be evaluated is the third corrosion form.

[0037] According to an implementable manner of the second aspect of the present invention, when the galvanic corrosion current acquisition module determines the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the seal coating system to be evaluated, it is specifically used for:

[0038] If the galvanic corrosion form of the sealing coating system to be evaluated is the first corrosion form, compare the levels of E1, E2 and E3, and use the one with the lowest corrosion potential among E1, E2 and E3 as the galvanic anode.

[0039] According to one achievable manner of the second aspect of the present invention, when the galvanic corrosion current acquisition module determines the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated, it is further specifically used to:

[0040] If E2 has the lowest corrosion potential among E1, E2 and E3, compare the sizes of E1, E2, E3 and E5;

[0041] If only one of E1, E2 and E3 is greater than E5, the one with the highest corrosion potential among E1, E2 and E3 shall be used as the galvanic cathode, and the others shall be used as the galvanic anode; if only one of E1, E2 and E3 is less than E5, the one with the lowest corrosion potential among E1, E2 and E3 shall be used as the galvanic anode, and the others shall be used as the galvanic cathode.

[0042] According to one achievable method of the second aspect of the present invention, when the galvanic corrosion current acquisition module determines the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated, it is specifically used to:

[0043] If the galvanic corrosion form of the sealing coating system to be evaluated is the second corrosion form, the surface layer and the connecting layer with the lowest corrosion potential are used as the galvanic anode, and the surface layer and the connecting layer with the highest corrosion potential are used as the galvanic cathode.

[0044] According to a possible implementation of the second aspect of the present invention, it is assumed that g represents the galvanic corrosion current. The corrosion risk assessment module is specifically used for:

[0045] If i g ≤3.0μA / cm 2 , determining that the corrosion risk level of the sealing coating system to be evaluated is level one risk, which means that the corrosion risk is low and the material is allowed to be used;

[0046] If 3.0μA / cm 2 g ≤10.0μA / cm 2 , determining that the corrosion risk level of the sealing coating system to be evaluated is level 2 risk, which indicates a high corrosion risk and requires anti-corrosion measures to be taken before use;

[0047] If i g >10.0μA / cm 2 ​, it is determined that the corrosion risk level of the sealing coating system to be evaluated is level three risk, and the level three risk means that the corrosion risk is very high and the material is restricted for use.

[0048] According to an achievable manner of the second aspect of the present invention, the galvanic corrosion form determination module is further specifically configured to:

[0049] If the galvanic corrosion form of the sealing coating system to be evaluated is the third corrosion form, it is determined that the sealing coating system to be evaluated does not have the risk of interlayer galvanic corrosion.

[0050] A third aspect of the present invention provides a sealing coating galvanic corrosion risk assessment device, comprising:

[0051] A memory for storing instructions; wherein the instructions are instructions for implementing the method for assessing the risk of galvanic corrosion of sealing coatings as described in any one of the above implementation methods;

[0052] A processor is configured to execute instructions in the memory.

[0053] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method for assessing the risk of galvanic corrosion of sealing coatings as described in any of the above-mentioned implementation methods.

[0054] It can be seen from the above technical solutions that the present invention has the following advantages:

[0055] The present invention obtains electrochemical test data on the corrosion potential of the sealing coating system to be evaluated, determines the galvanic corrosion form of the sealing coating system to be evaluated based on the electrochemical test data, determines the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form, obtains the galvanic corrosion current between the galvanic anode and galvanic cathode, and then determines the corrosion risk level of the sealing coating system to be evaluated according to the magnitude of the galvanic corrosion current; the present invention evaluates the risk level of the sealing coating system to be evaluated based on the corrosion potential parameters, and provides a corresponding risk level evaluation standard process, thereby realizing a rapid and effective analysis of the galvanic corrosion situation of the sealing coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0057] Figure 1A flow chart of a method for assessing galvanic corrosion risk of a sealing coating provided in accordance with an optional embodiment of the present invention;

[0058] Figure 2 A schematic diagram of a galvanic corrosion current test for a first corrosion form provided in accordance with an optional embodiment of the present invention;

[0059] Figure 3 A schematic diagram of a galvanic corrosion current test for a second corrosion form provided by an optional embodiment of the present invention;

[0060] Figure 4 A structural connection block diagram of a sealing coating galvanic corrosion risk assessment system provided in accordance with an optional embodiment of the present invention.

[0061] Reference numerals:

[0062] 1-substrate working electrode; 2-connecting layer working electrode; 3-surface working electrode; 4-electrochemical workstation; 5-electrolytic cell; 6-electrolyte; 7-reference electrode; 10-electrochemical test data acquisition module; 20-galvanic corrosion form determination module; 30-galvanic corrosion current acquisition module; 40-corrosion risk assessment module. DETAILED DESCRIPTION

[0063] The embodiments of the present invention provide a method, system and device for assessing the risk of galvanic corrosion of a sealing coating, which are used to solve the technical problem of how to quickly and effectively assess the galvanic corrosion of a sealing coating.

[0064] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0065] The present invention provides a method for assessing the risk of galvanic corrosion of a sealing coating.

[0066] See also Figure 1 , Figure 1 A flow chart of a method for assessing galvanic corrosion risk of a sealing coating provided by an embodiment of the present invention is shown.

[0067] An embodiment of the present invention provides a method for assessing galvanic corrosion risk of a sealing coating, comprising:

[0068] Step S1, obtaining electrochemical test data of the sealing coating system to be evaluated, wherein the electrochemical test data includes the corrosion potential of each layer in the sealing coating system to be evaluated, the corrosion potential of each layer when forcedly coupled, and the corrosion potential of the entire sealing coating system to be evaluated.

[0069] The sealing coating system to be evaluated includes a surface layer, a connecting layer and a substrate connected in sequence. In step S1, the corrosion potential of each layer refers to the corrosion potential of the surface layer, the corrosion potential of the connecting layer and the corrosion potential of the substrate.

[0070] In the prior art, electrochemical test data is generally obtained based on electrochemical testing methods. Specifically, he constructed a three-electrode test system and connected it to the electrochemical workstation 4 to obtain electrochemical test data based on corrosion potential testing. Among them, when obtaining the corrosion potential of the surface layer or the connecting layer in the sealing coating system to be evaluated, the surface layer or the connecting layer is used as the working electrode in the three-electrode test system, and when obtaining the corrosion potential of the base layer, the base layer is used as the working electrode in the three-electrode test system. When obtaining the corrosion potential when each layer is forced to couple, the cross section of the sealing coating system is used as the working surface of the working electrode; when obtaining the corrosion potential of the entire sealing coating system to be evaluated, the entire sealing coating system to be evaluated is used as the working electrode in the three-electrode test system.

[0071] The present invention does not limit the specific electrochemical testing method.

[0072] Step S2, determining the galvanic corrosion form of the sealing coating system to be evaluated based on the electrochemical test data, the galvanic corrosion form includes a first corrosion form, a second corrosion form and a third corrosion form, wherein the first corrosion form indicates that a ternary galvanic corrosion situation occurs due to the combined action of the surface layer, the connecting layer and the substrate, the second corrosion form indicates that a binary galvanic corrosion situation occurs between the surface layer and the connecting layer, and the third corrosion form indicates that only surface corrosion occurs.

[0073] When ternary galvanic corrosion occurs, which is caused by the combined action of the surface layer, the connecting layer, and the substrate, it means that the surface layer, the connecting layer, and the substrate of the sealing coating system all participate in the galvanic corrosion reaction, and it also indicates that the corrosive medium has penetrated into the connecting layer / substrate interface. When galvanic corrosion occurs between the surface layer and the connecting layer, it means that the corrosive medium has not penetrated into the substrate in a short period of time, and the ternary galvanic action of the surface layer, the connecting layer, and the substrate has not occurred, and the corrosive medium has penetrated into the surface / connecting layer interface. When only surface corrosion occurs, it means that the corrosive medium has not penetrated into the surface / connecting layer interface. The embodiment of the present invention is based on these three corrosion conditions as a form of galvanic corrosion, which can more comprehensively reflect the corrosion condition of the sealing coating and lay a good foundation for the subsequent assessment of the corrosion risk level.

[0074] Let \(E_1\) represent the corrosion potential of the surface layer in the seal coating system to be evaluated, \(E_2\) represent the corrosion potential of the intermediate layer in the seal coating system to be evaluated, \(E_3\) represent the corrosion potential of the base layer in the seal coating system to be evaluated, \(E_4\) represent the corrosion potential when the layers are forced to couple, and \(E_5\) represent the corrosion potential of the entire seal coating system to be evaluated. Based on the mixed potential theory of galvanic corrosion, the inventor made the following analysis:

[0075] When \(E_4\approx E_5\), it indicates that the surface layer, intermediate layer, and substrate of the seal coating system all participate in the galvanic corrosion reaction, and it also shows that the corrosive medium penetrates to the intermediate layer / substrate interface. The coating system undergoes ternary galvanic corrosion jointly affected by the surface layer, intermediate layer, and substrate. At this time, \(E_5\) must be a value between the maximum and minimum of \(E_1\sim E_3\). When \(E_4\neq E_5\), it indicates that the corrosive medium has not penetrated to the substrate in a short time, and the ternary galvanic effect of the surface layer, intermediate layer, and substrate does not occur. When in the case of \(E_4\neq E_5\), if \(E_5\approx E_1\), it indicates that only the surface layer of the seal coating system is corroded, and the corrosive medium has not penetrated to the surface layer / intermediate layer interface; if \(E_5\) is between \(E_1\) and \(E_2\), it indicates that the seal coating system undergoes galvanic corrosion between the surface layer and the intermediate layer, and the corrosive medium penetrates to the surface layer / intermediate layer interface.

[0076] Based on the above analysis, when determining the galvanic corrosion form of the seal coating system to be evaluated according to the electrochemical test data, the following can be specifically executed:

[0077] If the difference between \(E_4\) and \(E_5\) is less than the first preset threshold, determine that the galvanic corrosion form of the seal coating system to be evaluated is the first corrosion form;

[0078] If the difference between \(E_4\) and \(E_5\) is not less than the first preset threshold, and \(E_1 < E_5 < E_2\), determine that the galvanic corrosion form of the seal coating system to be evaluated is the second corrosion form;

[0079] If the difference between \(E_4\) and \(E_5\) is not less than the first preset threshold, and the difference between \(E_5\) and \(E_1\) is not less than the second preset threshold, determine that the galvanic corrosion form of the seal coating system to be evaluated is the third corrosion form.

[0080] [[ID=It is 18]]where the values of the first preset threshold and the second preset threshold can be the same or different, but both are relatively small. Thus, when the difference between \(E_4\) and \(E_5\) is less than the first preset threshold, it means \(E_4\) is approximately equal to \(E_5\), and when the difference between \(E_5\) and \(E_1\) is not less than the second preset threshold, it means \(E_5\) is approximately equal to \(E_1\).

[0081] Step S3, determine the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the seal coating system to be evaluated, and obtain the galvanic corrosion current between the galvanic anode and the galvanic cathode.

[0082] In the case of three-element galvanic corrosion, the most severely corroded anode, i.e., the portion with the lowest potential, can be further determined by comparing the values ​​of E1 to E3. For example, if E1 < E2 < E3, the surface layer of the coating system will act as the anode during galvanic corrosion, accelerating corrosion. The portion with the highest potential will act as the cathode.

[0083] As an achievable manner, the method of determining the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated further includes:

[0084] If E2 has the lowest corrosion potential among E1, E2 and E3, compare the sizes of E1, E2, E3 and E5;

[0085] If only one of E1, E2 and E3 is greater than E5, the one with the highest corrosion potential among E1, E2 and E3 shall be used as the galvanic cathode, and the others shall be used as the galvanic anode; if only one of E1, E2 and E3 is less than E5, the one with the lowest corrosion potential among E1, E2 and E3 shall be used as the galvanic anode, and the others shall be used as the galvanic cathode.

[0086] When E2's corrosion potential is lowest, its role as a galvanic anode accelerates corrosion, leading to an extreme galvanic corrosion situation with a large cathode and a small anode. This severely impacts the overall bonding strength of the sealing coating system. The present invention rapidly identifies the galvanic cathode and anode by comparing the sizes of E1, E2, E3, and E5.

[0087] When obtaining the galvanic corrosion current between the galvanic anode and the galvanic cathode, the test data obtained based on the following test method can be used.

[0088] (a) When three-way galvanic corrosion, i.e., the first form of corrosion, occurs, in which the surface layer, the connecting layer, and the substrate act simultaneously, this three-way galvanic effect can be measured using a three-channel electrochemical workstation 4. Each channel includes two working electrode connections and one reference electrode connection.

[0089] During testing, follow Figure 2 As shown, the substrate working electrode 1, the connecting layer working electrode 2 and the surface working electrode 3 are placed in an electrolytic cell 5 containing an electrolyte 6, and the substrate working electrode 1, the connecting layer working electrode 2 and the surface working electrode 3 are respectively connected to the first working electrode wiring of the three channels, and the second working electrode wiring of the three channels are connected together. At the same time, the reference electrode wiring of the three channels is uniformly connected to the reference electrode 7. In this way, the respective galvanic current tests between the surface layer of the sealing coating, the connecting layer and the substrate can be realized.

[0090] When the sealing coating system has three-part coupling, the cathode and anode distribution of the galvanic system can be determined based on the corrosion potential, or the cathode and anode distribution of the galvanic system can be determined based on the corrosion potential. Figure 2 The positive or negative value of the galvanic current tested is used to determine the cathode or anode. The only possible combinations of ternary galvanic corrosion are "single cathode + double anode" or "double cathode + single anode". Since the total current on the anode surface is equal to the total current on the cathode surface, the current intensity on the single cathode or single anode surface can be used to represent the galvanic current of the ternary system.

[0091] (b) When only the coupling effect between the surface layer and the connecting layer occurs, that is, the second form of corrosion, the galvanic test electrodes are a separate surface layer and a separate connecting layer, respectively. In this case, the test can be performed based on a three-electrode test system.

[0092] Specifically, if Figure 3 As shown, the connecting layer and the surface layer serve as working electrodes. The connecting layer working electrode 2 and the surface working electrode 3 are encapsulated and placed in an electrolytic cell 5, wherein the exposed portions of the connecting layer working electrode 2 and the surface working electrode 3 are in contact with the electrolyte 6 in the electrolytic cell 5. The connecting layer working electrode 2, the surface working electrode 3, and the reference electrode 7 form a three-electrode test system and are connected to the corresponding interfaces of the electrochemical workstation 4 via wires. Among them, the wire connection portions of the connecting layer working electrode 2 and the surface working electrode 3 are located above the liquid level of the electrolyte 6. The connecting layer working electrode 2 is connected to the "WE2" interface of the electrochemical workstation 4, the surface working electrode 3 is connected to the "WE1" interface of the electrochemical workstation 4, and the reference electrode 7 is connected to the "RE" interface of the electrochemical workstation 4.

[0093] The galvanic current between the surface layer and the connecting layer can be measured using a zero resistance ammeter (ZRA) on the electrochemical workstation 4 .

[0094] The measurement circuit for the zero-resistance current method includes two different working electrodes and a reference electrode. One working electrode is grounded, and the other is connected to the inverting terminal of an operational amplifier. Because the internal structure of the potentiostat dictates that the other working electrode is connected to a virtual ground, the two working electrodes are theoretically at the same potential, effectively short-circuited. In this case, the potentiostat measures the short-circuit current flowing between the two electrodes of the galvanic pair, also known as the galvanic current. Since the current flowing through the operational amplifier is actually provided by the operational amplifier itself, rather than from the working electrode to the counter electrode, its value is equal to the galvanic current flowing in the electrolytic cell and has no effect on the cell itself, this connection method is called the zero-resistance current mode. The measured current is the galvanic current between the two working electrodes.

[0095] Step S4: determining the corrosion risk level of the sealing coating system to be evaluated according to the magnitude of the galvanic corrosion current.

[0096] The aviation standard HB5374 "Method for Determining Galvanic Current of Different Metals" can be used to classify the galvanic corrosion sensitivity of the sealing coating into multiple risk levels according to the magnitude of the galvanic current. Specifically, if i g represents the galvanic corrosion current, and determining the corrosion risk level of the sealing coating system to be evaluated according to the magnitude of the galvanic corrosion current includes:

[0097] If i g ≤3.0μA / cm 2 , determining that the corrosion risk level of the sealing coating system to be evaluated is level one risk, which means that the corrosion risk is low and the material is allowed to be used;

[0098] If 3.0μA / cm 2 g ≤10.0μA / cm 2 , determining that the corrosion risk level of the sealing coating system to be evaluated is level 2 risk, which indicates a high corrosion risk and requires anti-corrosion measures to be taken before use;

[0099] If i g >10.0μA / cm 2 , it is determined that the corrosion risk level of the sealing coating system to be evaluated is level three risk, and the level three risk means that the corrosion risk is very high and the material is restricted for use.

[0100] Furthermore, the first-level risk can be further divided into multiple levels to determine the optimal material when the material is allowed to be used. For example, the first-level risk can be divided into the following three levels:

[0101] Grade A:i g ≤0.3μA / cm 2 ;

[0102] B level: 0.3 g ≤1.0μA / cm 2 ;

[0103] C-level: 1.0 g ≤3.0μA / cm 2 .

[0104] Furthermore, the method further comprises:

[0105] If the galvanic corrosion form of the sealing coating system to be evaluated is the third corrosion form, it is determined that the sealing coating system to be evaluated does not have the risk of interlayer galvanic corrosion.

[0106] The present invention also provides a sealing coating galvanic corrosion risk assessment system.

[0107] See also Figure 2 ,​​​ Figure 2 The structural connection block diagram of a sealing coating galvanic corrosion risk assessment system provided by an embodiment of the present invention is shown.

[0108] An embodiment of the present invention provides a sealing coating galvanic corrosion risk assessment system, including:

[0109] An electrochemical test data acquisition module 10, configured to acquire electrochemical test data of a sealing coating system to be evaluated, where the electrochemical test data includes the corrosion potential of each layer in the sealing coating system to be evaluated, the corrosion potential when each layer is forced to be coupled, and the corrosion potential of the entire sealing coating system to be evaluated;

[0110] A galvanic corrosion form determination module 20, configured to determine the galvanic corrosion form of the sealing coating system to be evaluated according to the electrochemical test data, where the galvanic corrosion form includes a first corrosion form, a second corrosion form, and a third corrosion form. The first corrosion form indicates that ternary galvanic corrosion occurs due to the combined action of the surface layer, the connection layer, and the substrate. The second corrosion form indicates that binary galvanic corrosion occurs between the surface layer and the connection layer. The third corrosion form indicates that only surface layer corrosion occurs;

[0111] A galvanic corrosion current acquisition module 30, configured to determine the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated, and acquire the galvanic corrosion current between the galvanic anode and the galvanic cathode;

[0112] A corrosion risk assessment module 40, configured to determine the corrosion risk level of the sealing coating system to be evaluated according to the magnitude of the galvanic corrosion current.

[0113] As a feasible implementation, let E1 represent the corrosion potential of the surface layer in the sealing coating system to be evaluated, E2 represent the corrosion potential of the connection layer in the sealing coating system to be evaluated, E3 represent the corrosion potential of the base layer in the sealing coating system to be evaluated, E4 represent the corrosion potential when each layer is forced to be coupled, and E5 represent the corrosion potential of the entire sealing coating system to be evaluated. The galvanic corrosion form determination module 20 is specifically configured to:

[0114] If the difference between E4 and E5 is less than a first preset threshold, determine that the galvanic corrosion form of the sealing coating system to be evaluated is the first corrosion form;

[0115] If the difference between E4 and E5 is not less than the first preset threshold, and E1 < E5 < E2, determine that the galvanic corrosion form of the sealing coating system to be evaluated is the second corrosion form;

[0116] If the difference between E4 and E5 is not less than the first preset threshold, and the difference between E5 and E1 is not less than the second preset threshold, it is determined that the galvanic corrosion form of the sealing coating system to be evaluated is the third corrosion form.

[0117] As an achievable manner, when the galvanic corrosion current acquisition module 30 determines the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated, it is specifically used to:

[0118] If the galvanic corrosion form of the sealing coating system to be evaluated is the first corrosion form, compare the levels of E1, E2 and E3, and use the one with the lowest corrosion potential among E1, E2 and E3 as the galvanic anode.

[0119] As an achievable manner, when the galvanic corrosion current acquisition module 30 determines the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated, it is further specifically used to:

[0120] If E2 has the lowest corrosion potential among E1, E2 and E3, compare the sizes of E1, E2, E3 and E5;

[0121] If only one of E1, E2 and E3 is greater than E5, the one with the highest corrosion potential among E1, E2 and E3 shall be used as the galvanic cathode, and the others shall be used as the galvanic anode; if only one of E1, E2 and E3 is less than E5, the one with the lowest corrosion potential among E1, E2 and E3 shall be used as the galvanic anode, and the others shall be used as the galvanic cathode.

[0122] As an achievable manner, when the galvanic corrosion current acquisition module 30 determines the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated, it is specifically used to:

[0123] If the galvanic corrosion form of the sealing coating system to be evaluated is the second corrosion form, the surface layer and the connecting layer with the lowest corrosion potential are used as the galvanic anode, and the surface layer and the connecting layer with the highest corrosion potential are used as the galvanic cathode.

[0124] As a way to achieve this, let g represents the galvanic corrosion current. The corrosion risk assessment module 40 is specifically used to:

[0125] If i g ≤3.0μA / cm 2 , determining that the corrosion risk level of the sealing coating system to be evaluated is level one risk, which means that the corrosion risk is low and the material is allowed to be used;

[0126] If 3.0μA / cm 2 g ​≤10.0μA / cm 2 , determining that the corrosion risk level of the sealing coating system to be evaluated is level 2 risk, which indicates a high corrosion risk and requires anti-corrosion measures to be taken before use;

[0127] If i g >10.0μA / cm 2 , it is determined that the corrosion risk level of the sealing coating system to be evaluated is level three risk, and the level three risk means that the corrosion risk is very high and the material is restricted for use.

[0128] According to an achievable manner of the second aspect of the present invention, the galvanic corrosion form determination module is further specifically configured to:

[0129] If the galvanic corrosion form of the sealing coating system to be evaluated is the third corrosion form, it is determined that the sealing coating system to be evaluated does not have the risk of interlayer galvanic corrosion.

[0130] The present invention also provides a sealing coating galvanic corrosion risk assessment device, comprising:

[0131] A memory for storing instructions; wherein the instructions are instructions for implementing the method for assessing the risk of galvanic corrosion of sealing coatings as described in any one of the above embodiments;

[0132] A processor is configured to execute instructions in the memory.

[0133] The present invention also provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for assessing the risk of galvanic corrosion of a sealing coating as described in any one of the above embodiments is implemented.

[0134] The above-mentioned embodiment of the present invention performs risk level assessment of the sealing coating system to be assessed based on corrosion potential parameters, and provides a corresponding standard process for risk level assessment, which can achieve rapid and effective analysis of the galvanic corrosion of the sealing coating.

[0135] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments, and the specific beneficial effects of the systems, devices and modules described above can refer to the corresponding beneficial effects in the aforementioned method embodiments, which will not be repeated here.

[0136] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the modules is merely a logical function division. In actual implementation, there may be other division methods, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0137] The modules described as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules may be selected to achieve the purpose of the present embodiment according to actual needs.

[0138] In addition, the functional modules in various embodiments of the present invention may be integrated into a single processing module, or each module may exist physically separately, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0139] If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0140] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for assessing the risk of galvanic corrosion of sealing coatings, characterized in that: include: Obtaining electrochemical test data of the sealing coating system to be evaluated, wherein the electrochemical test data includes the corrosion potential of each layer in the sealing coating system to be evaluated, the corrosion potential of each layer when forced coupling occurs, and the corrosion potential of the entire sealing coating system to be evaluated; Determine the galvanic corrosion form of the sealing coating system to be evaluated according to the electrochemical test data, wherein the galvanic corrosion form includes a first corrosion form, a second corrosion form and a third corrosion form, wherein the first corrosion form indicates that a ternary galvanic corrosion situation caused by the joint action of the surface layer, the connecting layer and the substrate has occurred, the second corrosion form indicates that a binary galvanic corrosion situation between the surface layer and the connecting layer has occurred, and the third corrosion form indicates that only the surface layer has corroded; Assuming that E1 represents the corrosion potential of the surface layer in the sealing coating system to be evaluated, E2 represents the corrosion potential of the connecting layer in the sealing coating system to be evaluated, E3 represents the corrosion potential of the base layer in the sealing coating system to be evaluated, E4 represents the corrosion potential of the layers when forced coupling is performed, and E5 represents the corrosion potential of the entire sealing coating system to be evaluated, the galvanic corrosion form of the sealing coating system to be evaluated is determined according to the electrochemical test data, including: If the difference between E4 and E5 is less than a first preset threshold, it is determined that the galvanic corrosion form of the sealing coating system to be evaluated is the first corrosion form; If the difference between E4 and E5 is not less than the first preset threshold, and , determining that the galvanic corrosion form of the sealing coating system to be evaluated is the second corrosion form; If the difference between E4 and E5 is not less than the first preset threshold, and the difference between E5 and E1 is less than the second preset threshold, it is determined that the galvanic corrosion form of the sealing coating system to be evaluated is the third corrosion form; Determine the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated, and obtain the galvanic corrosion current between the galvanic anode and the galvanic cathode; The step of determining the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated comprises: If the galvanic corrosion form of the sealing coating system to be evaluated is the first corrosion form, compare the levels of E1, E2 and E3, and use the one with the lowest corrosion potential among E1, E2 and E3 as the galvanic anode; If E2 has the lowest corrosion potential among E1, E2 and E3, compare the sizes of E1, E2, E3 and E5; If only one of E1, E2 and E3 is greater than E5, the one with the highest corrosion potential among E1, E2 and E3 is used as the galvanic cathode, and the others are used as galvanic anodes; if only one of E1, E2 and E3 is less than E5, the one with the lowest corrosion potential among E1, E2 and E3 is used as the galvanic anode, and the others are used as galvanic cathodes; If the galvanic corrosion form of the sealing coating system to be evaluated is the second corrosion form, the surface layer and the connecting layer with the lowest corrosion potential are used as the galvanic anode, and the surface layer and the connecting layer with the highest corrosion potential are used as the galvanic cathode; The corrosion risk level of the sealing coating system to be evaluated is determined according to the magnitude of the galvanic corrosion current.

2. The method for assessing galvanic corrosion risk of sealing coatings according to claim 1, characterized in that: set up represents the galvanic corrosion current, and determining the corrosion risk level of the sealing coating system to be evaluated according to the magnitude of the galvanic corrosion current includes: like , determining that the corrosion risk level of the sealing coating system to be evaluated is level one risk, which means that the corrosion risk is low and the material is allowed to be used; like , determining that the corrosion risk level of the sealing coating system to be evaluated is level 2 risk, which means that the corrosion risk is high and anti-corrosion measures need to be taken before use; like , it is determined that the corrosion risk level of the sealing coating system to be evaluated is level 3 risk, and the level 3 risk means that the corrosion risk is very high and the material is restricted for use.

3. The method for assessing galvanic corrosion risk of sealing coatings according to claim 1, characterized in that: The method further comprises: If the galvanic corrosion form of the sealing coating system to be evaluated is the third corrosion form, it is determined that there is no interlayer galvanic corrosion risk in the sealing coating system to be evaluated.

4. A sealing coating galvanic corrosion risk assessment system, characterized in that: include: An electrochemical test data acquisition module, used to acquire electrochemical test data of the sealing coating system to be evaluated, wherein the electrochemical test data includes the corrosion potential of each layer in the sealing coating system to be evaluated, the corrosion potential of each layer when forced coupling, and the corrosion potential of the entire sealing coating system to be evaluated; A galvanic corrosion form determination module is used to determine the galvanic corrosion form of the sealing coating system to be evaluated according to the electrochemical test data, wherein the galvanic corrosion form includes a first corrosion form, a second corrosion form and a third corrosion form, wherein the first corrosion form indicates that a ternary galvanic corrosion situation caused by the joint action of the surface layer, the connecting layer and the substrate has occurred, the second corrosion form indicates that a binary galvanic corrosion situation between the surface layer and the connecting layer has occurred, and the third corrosion form indicates that only surface corrosion has occurred; Assuming that E1 represents the corrosion potential of the surface layer in the sealing coating system to be evaluated, E2 represents the corrosion potential of the connecting layer in the sealing coating system to be evaluated, E3 represents the corrosion potential of the base layer in the sealing coating system to be evaluated, E4 represents the corrosion potential of the layers when forced coupling is performed, and E5 represents the corrosion potential of the entire sealing coating system to be evaluated, the galvanic corrosion form of the sealing coating system to be evaluated is determined according to the electrochemical test data, including: If the difference between E4 and E5 is less than a first preset threshold, it is determined that the galvanic corrosion form of the sealing coating system to be evaluated is the first corrosion form; If the difference between E4 and E5 is not less than the first preset threshold, and , determining that the galvanic corrosion form of the sealing coating system to be evaluated is the second corrosion form; If the difference between E4 and E5 is not less than the first preset threshold, and the difference between E5 and E1 is less than the second preset threshold, it is determined that the galvanic corrosion form of the sealing coating system to be evaluated is the third corrosion form; A galvanic corrosion current acquisition module, used to determine the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated, and to acquire the galvanic corrosion current between the galvanic anode and the galvanic cathode; The step of determining the corresponding galvanic anode and galvanic cathode according to the determined galvanic corrosion form of the sealing coating system to be evaluated comprises: If the galvanic corrosion form of the sealing coating system to be evaluated is the first corrosion form, compare the levels of E1, E2 and E3, and use the one with the lowest corrosion potential among E1, E2 and E3 as the galvanic anode; If E2 has the lowest corrosion potential among E1, E2 and E3, compare the sizes of E1, E2, E3 and E5; If only one of E1, E2 and E3 is greater than E5, the one with the highest corrosion potential among E1, E2 and E3 is used as the galvanic cathode, and the others are used as galvanic anodes; if only one of E1, E2 and E3 is less than E5, the one with the lowest corrosion potential among E1, E2 and E3 is used as the galvanic anode, and the others are used as galvanic cathodes; If the galvanic corrosion form of the sealing coating system to be evaluated is the second corrosion form, the surface layer and the connecting layer with the lowest corrosion potential are used as the galvanic anode, and the surface layer and the connecting layer with the highest corrosion potential are used as the galvanic cathode; The corrosion risk assessment module is used to determine the corrosion risk level of the sealing coating system to be assessed according to the magnitude of the galvanic corrosion current.

5. A sealing coating galvanic corrosion risk assessment device, characterized in that: include: A memory for storing instructions; wherein the instructions are instructions for implementing the method for assessing the risk of galvanic corrosion of sealing coatings according to any one of claims 1 to 3; A processor is used to execute instructions in the memory.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for assessing the risk of galvanic corrosion of sealing coatings as described in any one of claims 1 to 3 is implemented.

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