CN113158477B - Multi-metal coupling corrosion simulation analysis method - Google Patents
Multi-metal coupling corrosion simulation analysis method Download PDFInfo
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- CN113158477B CN113158477B CN202110467317.6A CN202110467317A CN113158477B CN 113158477 B CN113158477 B CN 113158477B CN 202110467317 A CN202110467317 A CN 202110467317A CN 113158477 B CN113158477 B CN 113158477B
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Abstract
The invention discloses a multi-metal coupling corrosion simulation analysis method, which comprises the following steps: and (4) carrying out galvanic sorting, namely sorting a plurality of metal materials covered in the multi-metal coupling system in a service environment to form a model. The model is simplified. And (4) judging the anode and the cathode respectively, wherein the anodes and the cathodes of various metal materials in the model are judged. And assigning calculation, namely inheriting the cathode and anode judgment result of the intermediate corrosion potential metal in the cathode and anode judgment, assigning a model, and developing simulation calculation, so that a corrosion hot spot area can be identified, and a calculation result is obtained. Therefore, the multi-metal coupling corrosion simulation analysis method solves the problem of corrosion matching design of multi-metal materials in the equipment design process, and can identify corrosion hot spot areas.
Description
Technical Field
The invention relates to the technical field of corrosion protection simulation analysis, in particular to a multi-metal coupling corrosion simulation analysis method.
Background
In daily life, due to the requirement of functional and mechanical adaptability, the assembly of multiple metals is frequently repeated, and in a corrosive environment, galvanic corrosion is easily formed due to the electrochemical activity difference among metal materials, so that the service performance of equipment is directly influenced. However, for a long time, the study objects of galvanic corrosion under corrosive environment mainly focus on the bimetallic coupling system formed by electrically connecting two metals, and the study on three or more than three kinds of multi-metal coupling systems is rarely related.
Meanwhile, even if a few researches on a multi-metal coupling system exist, the researches are mostly limited to a method of a laboratory test piece, if a research object has a complex geometric structure, the laboratory test is difficult to provide an accurate result, and in addition, the laboratory measurement cannot meet the requirements of small-amplitude change of multi-metal assembly and repetitive corrosion matching design in the equipment design process.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a multi-metal coupling corrosion simulation analysis method, which solves the problem of corrosion matching design of multi-metal materials in the equipment design process and can identify a corrosion hot spot area.
In order to achieve the above object, the present invention provides a multi-metal coupling corrosion simulation analysis method, which comprises: and (4) carrying out galvanic sorting, namely sorting a plurality of metal materials covered in the multi-metal coupling system in a service environment to form a model. The model is simplified. And (4) judging the anode and the cathode respectively, wherein the anodes and the cathodes of various metal materials in the model are judged. And assigning calculation, namely inheriting the cathode and anode judgment result of the intermediate corrosion potential metal in the cathode and anode judgment, assigning a model, and developing simulation calculation, so that a corrosion hot spot area can be identified, and a calculation result is obtained.
In one embodiment of the invention, the multiple metal materials covered in the multi-metal coupling system are sequenced in a service environment by a measuring instrument according to self-corrosion potential.
In one embodiment of the present invention, simplifying the model is to simplify the three-dimensional model into a two-dimensional model based on the symmetry of the actual three-dimensional model.
In one embodiment of the present invention, the plurality of metal materials includes a conductive non-metal material.
In an embodiment of the present invention, the method for simulation analysis of multi-metal coupled corrosion further includes: and setting an external window for slightly changing the assembly of the multi-metal coupling system and repeatedly calculating.
In one embodiment of the present invention, the number of the plurality of metal materials is three.
Compared with the prior art, the multi-metal coupling corrosion simulation analysis method can effectively solve the problem of multi-metal material corrosion matching design in the equipment design process, identifies the corrosion hot spot area, is purposeful, is particularly suitable for the work of multi-metal assembly small-amplitude change and repeated corrosion matching design, solves the design problem before a sample making machine, and accelerates the development process of corrosion resistance design.
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FIG. 1 is a schematic flow chart of a simulation analysis method for multi-metal coupled corrosion according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a calculation of a three-metal coupling system of a multi-metal coupling corrosion simulation analysis method according to an embodiment of the invention;
FIG. 3 is a schematic diagram of an external window of a simulation analysis method for multi-metal coupling corrosion according to an embodiment of the invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
Fig. 1 is a schematic flow chart of a simulation analysis method for multi-metal coupling corrosion according to an embodiment of the invention.
As shown in fig. 1, a simulation analysis method for corrosion coupling of multiple metals according to a preferred embodiment of the present invention includes: s1, carrying out galvanic sorting, and sorting a plurality of metal materials contained in the multi-metal coupling system in a service environment to form a model. And S2, simplifying the model. And S3, distinguishing the anode and the cathode, and distinguishing the anode and the cathode of the metal materials in the model respectively. And S4, assigning a value, carrying on the cathode and anode judgment result of the intermediate corrosion potential metal in the cathode and anode judgment, assigning a model, and carrying out simulation calculation, so that the corrosion hot spot area can be identified, and the calculation result is obtained.
In one embodiment of the invention, the multiple metal materials covered in the multi-metal coupling system are sequenced in a service environment by a measuring instrument according to self-corrosion potential.
In one embodiment of the present invention, simplifying the model is to simplify the three-dimensional model into a two-dimensional model based on the symmetry of the actual three-dimensional model. Many metallic materials include non-metallic materials of the conductive type.
In an embodiment of the present invention, the method for simulation analysis of multi-metal coupled corrosion further includes: and setting an external window 4 for slightly changing the assembly of the multi-metal coupling system and repeatedly calculating. The number of the plurality of metal materials is three.
In practical application, the simulation analysis method for multi-metal coupling corrosion mainly comprises the following steps: the method comprises four steps of galvanic sorting, model simplification, cathode and anode discrimination and assignment calculation. And (2) carrying out galvanic sorting, namely sorting n metal materials (M1, M2, …, Mn, n is more than or equal to 3 respectively) covered in a multi-metal coupling system in a service environment, and assuming that the final sequence is that the self-corrosion potential of M1 (Ecorr,1) < the self-corrosion potential of M2 (Ecorr,2) < the self-corrosion potential of Mn (Ecorr, n).
And simplifying the model, namely combining the actual situation of the model to reduce the calculated amount, simplifying the model as much as possible under the condition of not influencing the calculation and increasing the calculation efficiency.
And (3) judging the cathode and the anode, wherein for a couple system formed by double metals, the self-corrosion potential of the anode metal is low, and the self-corrosion potential of the cathode metal is high according to the mixed potential theory. Obviously, in such a multi-metallic material system, the self-corrosion potential of the metal Ml is the smallest, and is the anode, and the self-corrosion potential of the metal Mn is the largest, and is the cathode. The metal Mx (1< x < n) in the middle zone may be either the cathode or the anode. In order to judge the cathode and anode states of the metal Mx with the self-corrosion potential in the middle in the multi-metal system, the metal system can be split into (n-1) pairs of double-metal galvanic couple systems by taking the metal Mx as a reference to obtain (x-1) pairs of double-metal galvanic couple systems with the metal Mx as a cathode to obtain (n-x-2) pairs of double-metal galvanic couple systems with the metal Mx as an anode.
As shown in the following table, if the sum of the series of bimetal couple system coupling currents with the metal Mx as the cathode is larger than the sum of the series of bimetal couple system coupling currents with the metal Mx as the cathode, electrons are obtained on the surface of the metal Mx, and the metal Mx is used as the cathode in the whole metal system, otherwise, the metal Mx is used as the anode.
And (4) assigning calculation, namely inheriting the judgment result of the intermediate corrosion potential metal cathode and anode in the cathode and anode judgment, assigning to the simplified model, and carrying out simulation calculation to identify a corrosion hot spot region to obtain a calculation result.
In the equipment design process, all used main metal materials can be subjected to galvanic couple hanging sequence, and preparation is performed in advance.
In order to reduce the calculation amount when the intermediate metal Mx is used for distinguishing the cathode and the anode, Mx... Mn can be regarded as a whole when the metal Mx is used as the anode, namely only Mx in the system is used as the anode, and the rest metals are all cathodes.
Fig. 3 is a schematic diagram of an external window 4 of a simulation analysis method for multi-metal coupling corrosion according to an embodiment of the invention. As shown in fig. 3, the present invention is further provided with an external input window, which can input the dimensions of the components in the model, change the materials of the components, automatically perform the purposes of small-scale model modification and repetitive calculation, and then find the optimal corrosion matching scheme without affecting the performance of the target model.
Fig. 2 is a schematic diagram of a calculation of a three-metal coupling system of a multi-metal coupling corrosion simulation analysis method according to an embodiment of the invention. As shown in fig. 2, taking n ═ 3 as an example, the study object includes three metals: and carrying out corrosion simulation analysis on the metal A1, the metal B2 and the metal C3 in a seawater environment.
Referring to fig. 1, the simulation analysis method for multi-metal coupling corrosion provided by the invention comprises four parts, namely galvanic sorting, model simplification, cathode and anode discrimination and assignment calculation. Firstly, researching the corrosion potential of three metals in a seawater environment by using a laboratory measuring tool, and determining the galvanic sorting of the three metals in the same corrosion medium, wherein the determined galvanic sorting result of the three metals is as follows: metal a1> metal B2> metal C3.
The research object of the embodiment is corrosion simulation analysis of three metal pipelines in a seawater environment, and a three-dimensional corrosion model can be simplified into a two-dimensional corrosion model with less calculation amount by using the symmetry of the model.
After the galvanic couple sequencing and model simplification are completed, the judgment of the cathode and the anode in the model needs to be carried out: inheriting the measurement result of galvanic sorting, according to the theory of mixed potential, the metal A1 is a cathode in the trimetal system of the example, the metal C3 is an anode in the trimetal system, and the metal B2 may be either a cathode or an anode, and needs to be judged by the method provided by the invention.
In order to judge the cathode and anode states of the metal B2 with the middle self-corrosion potential in the three-metal system, the three-metal system can be split into two pairs of bimetal couple systems by taking the metal B2 as a reference, so that the bimetal couple system with the pair of metal B2 as a cathode is obtained, and the bimetal couple system with the pair of metal B2 as an anode is obtained.
As shown in the following table, if the sum of the series of bimetal couple system coupling currents with the metal B2 as the cathode is larger than the sum of the series of bimetal couple system coupling currents with the metal B2 as the anode, electrons are obtained on the surface of the metal B2, and the metal B2 serves as the cathode in the whole trimetallic system, otherwise, the metal B2 serves as the anode.
After the judgment of the middle corrosion potential metal cathode and anode of the metal system is finished, boundary conditions are set according to earlier measured data and a simplified model, and a required corrosion simulation analysis result of the three-metal coupling system can be obtained through assignment calculation.
In the actual engineering design, variables such as the size of a metal material, the type of the metal material, the arrangement sequence of the metal material and the like exist, the external window 4 is arranged by combining the simulation calculation method, and the work of small-amplitude change of multi-metal assembly and repeated corrosion matching design can be met on the premise of not influencing the performance of a target model, so that an optimal assembly system is found out.
In a word, the multi-metal coupling corrosion simulation analysis method can effectively solve the problem of multi-metal material corrosion matching design in the equipment design process, identifies the corrosion hot spot area, is purposeful, is particularly suitable for the work of multi-metal assembly small-amplitude change and repeated corrosion matching design, solves the design problem before a sample making machine, and accelerates the development process of corrosion-resistant design.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (4)
1. A multi-metal coupling corrosion simulation analysis method is characterized by comprising the following steps:
the method comprises the following steps of (1) carrying out galvanic sorting, wherein a plurality of metal materials covered in a multi-metal coupling system are sorted in a service environment to form a model;
simplifying the model;
judging the anode and the cathode, and respectively judging the anodes and the cathodes of various metal materials in the model; and
assigning calculation, namely inheriting the cathode and anode judgment result of the intermediate corrosion potential metal in the cathode and anode judgment, assigning the model, and carrying out simulation calculation so as to identify a corrosion hot spot region and obtain a calculation result;
sequencing a plurality of metal materials covered in the multi-metal coupling system in a service environment by a measuring instrument according to self-corrosion potential;
wherein, simplifying the model is to simplify the three-dimensional model into a two-dimensional model according to the symmetry of the actual three-dimensional model.
2. The multi-metal coupled corrosion simulation analysis method of claim 1, wherein the plurality of metallic materials comprise a conductive non-metallic material.
3. The multi-metal coupled corrosion simulation analysis method of claim 1, further comprising: and setting an external window for slightly changing the assembly of the multi-metal coupling system and repeatedly calculating.
4. The multi-metal-coupled corrosion simulation analysis method of claim 1, wherein the number of the plurality of metal materials is three.
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