Electrode assembly, detection equipment and manufacturing and mounting method of electrode assembly

Abstract

The invention discloses an electrode assembly, detection equipment and a manufacturing and mounting method of the electrode assembly. A working electrode, an auxiliary electrode and a reference electrode of the electrode assembly respectively comprise an insulating cylinder and an electrode core accommodated in the insulating cylinder; the insulating cylinder comprises a tail part extending out of a to-be-detected pipeline and a head part embedded in the to-be-detected pipeline, the electrode core is exposed from the front end surface of the head part and can be in contact with fluid in the to-be-detected pipeline to obtain an electrochemical signal, and the corrosion and scaling state of the inner wall of the to-be-detected pipeline is accurately detected.

Description

Technical Field

[0001] This document relates to the technology in the field of pipeline corrosion and pipe scale condition monitoring, especially an electrode assembly, a detection device and their manufacturing and installation methods. Background Art

[0002] Providing clean drinking water depends on the stable operation of the urban water supply system. As the pipeline to be measured in the urban water supply, which is the "lifeline" of the city, it is a key link in the system and also a strategically significant urban municipal infrastructure. Iron-based pipes are the most common in domestic and foreign water supply pipe networks. However, the inner wall of the iron pipes to be measured will corrode during long-term use, generating iron pipe scale mainly composed of iron oxides. Usually, the pipe scale adheres firmly to the inner wall of the pipeline to be measured. However, when the water quality or hydraulic conditions change, the pipe scale dissolves, breaks, and releases iron oxides into the water body, causing water quality deterioration. This process is often accompanied by the release of metals inside the pipe scale, resulting in problems such as excessive chromaticity, turbidity, iron, manganese, and effluent microorganisms, seriously affecting water supply safety.

[0003] The self-corrosion of iron water supply pipes to be measured mainly starts with pitting corrosion. Due to certain crystal defects on the surface of the metal substrate, the charge is concentrated at the defect sites, making it easy to occur electrochemical reactions to generate pitting pits, where a strong corrosion current can be observed. During the pitting corrosion process, metallic Fe(0) reacts electrochemically with oxidizing substances in water such as dissolved oxygen and free chlorine to form Fe 2+ , and then further reacts to form iron oxyhydroxide products such as goethite (γ-FeOOH). The γ-FeOOH inside the pipe scale is relatively unstable, and its loose and porous structure provides sufficient reaction sites for oxidants, promoting further corrosion. As the corrosion process deepens, the γ-FeOOH in the scale gradually transforms into more stable goethite (α-FeOOH). Various iron oxides such as hematite (Fe2O3), magnetite (Fe3O4), and siderite (FeCO3) further appear in the pipe scale. On the surface layer of the metal pipe scale, calcium carbonate particles co-precipitate with Fe(III) and Fe(II) to form a loose and porous particle layer, which includes various amorphous iron oxides such as Fe(OH)3, Fe(OH)2, and Fe2O3. During this process, the redox potential and corrosion current of the metal continuously fluctuate, which can effectively reflect the electrochemical reaction process of the metal substrate. At the same time, the formation of iron oxide deposits on the metal surface layer can also change the capacitance characteristics of the metal inner wall surface layer.

[0004] As the corrosion progresses, a stable scale layer forms on the inner surface of the iron water supply pipe to be tested. The scale layer is a relatively stable multi-layer structure. According to the classic pipe scale model proposed by Sarin, pipe scale is a stable multi-layer structure. It includes: (1) metal substrate Fe(0); (2) porous layer containing various iron oxides; (3) dense layer mainly composed of dense Fe3O4 crystals; (4) loose sedimentary layer mainly composed of amorphous or small granular components such as Fe(OH)3 and CaCO3. The special layered structure of pipe scale enables pipe scale to show a stable capacitive reactance signal.

[0005] In addition to self-corrosion, galvanic corrosion often occurs at the joints of different materials of the tested pipes and near the joints with other components such as valves due to the difference in metal materials. The rate of galvanic corrosion is usually higher than the rate of self-corrosion, which has a significant impact on the local corrosion of the water supply pipeline to be tested.

[0006] The iron release from the iron water supply pipe to be tested should be considered as a process relatively independent of corrosion. It is usually not directly caused by the oxidation of the metal, but rather comes from the dissolution of the loose and porous iron oxides inside the pipe scale. When the pipe scale breaks under certain conditions, the internal iron oxides dissolve and diffuse into the water body, causing the iron to be released. The released Fe(II) is oxidized and deposited, and together with other Fe(III) oxides, it forms particulate iron oxides, which manifests as an obvious "yellow water" phenomenon in the pipe network.

[0007] Iron pipe scale itself will dissolve and diffuse iron through redox reactions. According to Kuch's law, the surface of the metal pipe to be tested that has formed stable scale will undergo continuous corrosion and scale dissolution under low redox conditions, and its mechanism is an electrochemical reaction. Existing studies have confirmed from the electrochemical corrosion potential and current that high-valent iron oxides can effectively act as cathodes, forming galvanic cells with iron as anodes, producing obvious redox reactions. In addition, sudden changes in the water quality and hydraulic properties of the pipeline network often lead to ruptures in the pipe wall scale. Water source switching and saltwater intrusion are typical water quality change scenarios. Many water quality factors will affect iron release.

[0008] For water companies, it is not only necessary to understand the corrosion of the outer wall of the pipe to be tested, but also to know the corrosion, scaling and scale rupture status of the inner wall of the pipe to be tested. It is of great practical production guidance significance to evaluate the corrosion and iron release of the water supply pipe to be tested, timely understand the early signs of yellow water problems, and take timely treatment measures.

[0009] However, in traditional methods for monitoring the stability of water supply pipe networks, much reliance is placed on the change in the total iron concentration of the water output from the pipe network after the simulated pipe segments have operated for a long time. The corrosion process reflected is the cumulative amount. The widely used weight loss method calculates the corrosion rate by comparing the weight difference of the pipeline to be measured before and after corrosion, and what it reflects is also the cumulative amount. This method is difficult to accurately characterize the instantaneous reaction rate of the iron pipeline to be measured and the real-time state of the pipe scale. If it is necessary to study the actual pipeline to be measured, this method also requires destructive excavation and the construction of a reactor, and cannot simulate the state of the actual pipeline to be measured in real time and accurately.

[0010] Since the corrosion and iron release of the iron water supply pipeline to be measured is an electrochemical reaction process, electrochemical testing methods can be used to detect the changes in the electrochemical signals of the corrosion process and corrosion products of the iron water supply pipeline to be measured, and then reflect the corrosion process and tendency.

[0011] At present, electrochemical measurement methods have been used in the corrosion research of pipelines to be measured in various environments such as geothermal water, petroleum, and natural gas, and the erosion state of the pipelines to be measured is characterized by electrical signals. Such as resistance metal probes, potential array methods, etc.

[0012] The resistance metal probe extends into the pipeline to be measured. By testing the change in the probe resistance, the erosion degree of the metal on the surface layer of the probe can be reflected. However, the resistance metal probe is an intrusive probe, and its placement has a greater impact on the local flow state of the pipeline to be measured, has a certain impact on the corrosion process, and cannot characterize the state of the surface metal deposition oxides generated by metal corrosion. At the same time, for a pipe segment that has undergone a certain amount of corrosion, when inserting this probe, the historical corrosion cumulative amount of the pipe segment cannot be reflected by the erosion degree of the probe.

[0013] The potential array method directly connects the probes to form a resistance network on the outer wall of the pipe network, and obtains the corrosion characteristics of the pipeline to be measured by measuring the resistance between two electrodes. However, external surface corrosion will interfere with the potential array method. At the same time, when installing the probes, it is necessary to excavate and transform the water supply pipeline to be measured, and the engineering quantity is large, and it is inconvenient to use.

[0014] To sum up, the existing methods for monitoring the internal corrosion of water supply pipelines to be measured are difficult to conveniently and accurately obtain the real-time corrosion current and corrosion rate of in-service metal pipelines. The relevant electrochemical tests are also mostly used in scenarios such as the structural and performance changes of metal materials, and there is no relevant research on the stability of actual water supply pipelines to be measured. Summary of the Invention

[0015] The embodiments of the present application provide an electrode assembly, a detection device, and their manufacturing and installation methods, which can accurately characterize the change process of the inner wall corrosion and pipe scale of the pipeline to be measured.

[0016] An example of the present application provides an electrode assembly, including: a working electrode, a counter electrode, and a reference electrode. The working electrode, the counter electrode, and the reference electrode are arranged to be installed in a pipeline to be measured and detect the corrosion and scaling state of the inner wall of the pipeline to be measured;

[0017] The working electrode, the counter electrode, and the reference electrode all include an insulating cylinder and an electrode core accommodated in the insulating cylinder. The insulating cylinder includes a tail extending outside the pipeline to be measured and a head embedded in the pipeline to be measured. The electrode core is exposed from the front end face of the head and can contact the fluid in the pipeline to be measured to obtain an electrochemical signal.

[0018] In an exemplary embodiment, the working surfaces of the electrode cores of the working electrode, the counter electrode, and the reference electrode are radially expanded and flush with the fluid direction in the pipeline to be measured;

[0019] The working surfaces of the electrode cores of the working electrode, the counter electrode, and the reference electrode are arranged at the inner wall of the pipeline to be measured.

[0020] In an exemplary embodiment, the heads of the working electrode, the counter electrode, and the reference electrode are all embedded in the pipeline to be measured in a detachable manner;

[0021] External threads are provided on the side walls of the heads of the working electrode, the counter electrode, and the reference electrode, and can be installed in cooperation with the internal threads of the corresponding holes in the pipeline to be measured.

[0022] In an exemplary embodiment, the diameters of the electrode cores of the working electrode and the counter electrode are equal;

[0023] The outer diameters of the insulating cylinders of the working electrode, the counter electrode, and the reference electrode range from: greater than 1.0 cm and less than 2.0 cm.

[0024] In an exemplary embodiment, the electrode core of the working electrode is cylindrical and made of the same base material as the pipeline to be measured; or,

[0025] The electrode core of the working electrode is made from the pipeline to be measured. The electrode core of the working electrode includes a working surface exposed to the inner cavity of the pipeline to be measured, and the working surface has a corrosion scale layer on the inner wall of the pipeline to be measured.

[0026] In an exemplary embodiment, the electrode core of the counter electrode is circular and includes a first working surface exposed to the inner cavity of the pipeline to be measured and a second working surface opposite to the first working surface;

[0027] The front end of the auxiliary electrode head is provided with a depression extending into the inner cavity of the pipeline to be tested and used to install its own electrode core, and the side wall of the depression is circumferentially provided with a plurality of connecting grooves connecting the inner cavity of the pipeline to be tested and the depression, so that the fluid in the pipeline to be tested flows into the second working surface of the auxiliary electrode through the connecting grooves.

[0028] In an exemplary embodiment, the electrode core of the reference electrode is cylindrical, and the front end surface of the reference electrode head is provided with a receiving hole for accommodating the electrode core thereof.

[0029] An embodiment of the present application provides a detection device, comprising an electrode assembly as described in any of the above embodiments and a detection device connected to the electrode assembly;

[0030] The detection device includes an electrochemical workstation connected to the electrode assembly and a computer connected to the electrochemical workstation.

[0031] In an exemplary embodiment, the detection device further comprises a pipeline to be tested, wherein the pipeline to be tested is provided with a plurality of holes, and the spacing between adjacent holes is less than 1.5 cm;

[0032] The heads of the working electrode, the auxiliary electrode and the reference electrode of the electrode assembly are respectively installed in the corresponding holes.

[0033] In an exemplary embodiment, the working electrode, the auxiliary electrode and the reference electrode are arranged at intervals along the water flow direction of the pipeline to be tested, and the working electrode is located between the auxiliary electrode and the reference electrode; or

[0034] The working electrode, the auxiliary electrode and the reference electrode are arranged at intervals along the circumference of the pipeline to be measured, and the working electrode is located between the auxiliary electrode and the reference electrode.

[0035] An embodiment of the present application provides a method for manufacturing an electrode assembly as described in any of the above embodiments, comprising:

[0036] Manufacturing electrode cores of working electrodes, auxiliary electrodes and reference electrodes, wherein the electrode core of the working electrode is manufactured using the same substrate as the pipeline to be tested or using the corrosion scale surface of the material obtained from the pipeline to be tested as the working surface of the electrode core;

[0037] The insulating cylinders of the working electrode, the auxiliary electrode and the reference electrode are made of insulating materials, and heads capable of being embedded in the pipeline to be tested are respectively made on the sides of the working electrode, the auxiliary electrode and the reference electrode.

[0038] An embodiment of the present application provides a method for installing an electrode assembly as described in any of the above embodiments, comprising:

[0039] Holes corresponding to the heads of the working electrode, auxiliary electrode, and reference electrode of the electrode assembly are made on the body of the pipeline to be measured;

[0040] The heads of the working electrode, auxiliary electrode, and reference electrode of the electrode assembly are inserted into the corresponding holes;

[0041] The working surfaces of the working electrode, auxiliary electrode, and reference electrode of the electrode assembly are all set to be flush with the fluid direction in the pipeline to be measured and are arranged at the inner wall of the pipeline to be measured.

[0042] The electrode assembly of the embodiment of the present application can be inserted into the pipeline to be measured and directly contact the fluid at the inner wall of the pipeline to be measured, detect the hydraulic and water quality conditions at the inner wall of the pipeline to be measured, so as to accurately collect the parameters of the corrosion condition of the inner wall of the pipeline to be measured, and accurately characterize the change process of the corrosion and pipe scale of the inner wall of the pipeline to be measured.

[0043] The installation method of the electrode assembly of the embodiment of the present application does not require destructive excavation of the pipeline to be measured, and the installation method is simple and has strong applicability. Moreover, the electrode assembly of the embodiment of the present application can continuously capture the electrochemical signals of the electrode core of the electrode assembly, and can accurately and real-time characterize the corrosion rate and the real-time state of the pipe scale of the pipeline to be measured.

[0044] Other features and advantages of the present application will be described in the subsequent specification, and part of them will become obvious from the specification, or will be understood by implementing the present application. Other advantages of the present application can be realized and obtained through the solutions described in the specification and the drawings. Description of the Drawings

[0045] The drawings are used to provide an understanding of the technical solutions of the present application, and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solutions of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0046] Figure 1 It is a schematic diagram of the installation and connection of the detection device according to the embodiment of the present application;

[0047] Figure 2 It is a three-dimensional view of the working electrode of the electrode assembly according to the embodiment of the present application;

[0048] Figure 3 It is Figure 2 The three-dimensional split view of;

[0049] Figure 4 It is a three-dimensional view of the auxiliary electrode of the electrode assembly according to the embodiment of the present application;

[0050] Figure 5 It is Figure 4 The three-dimensional split view of;

[0051] Figure 6 Stereoscopic view of the reference electrode of the electrode assembly according to an embodiment of the present application;

[0052] Figure 7 is Figure 6 stereoscopic exploded view of;

[0053] Figure 8 Schematic diagram showing the arrangement of the three electrodes of the electrode assembly according to an embodiment of the present application along the water flow direction of the pipeline to be measured;

[0054] Figure 9 Schematic diagram showing the circumferential arrangement of the three electrodes of the electrode assembly according to an embodiment of the present application along the pipeline to be measured;

[0055] Figure 10 Flow chart of the manufacturing method of the electrode assembly according to an embodiment of the present application;

[0056] Figure 11 Flow chart of the installation method of the electrode assembly according to an embodiment of the present application.

[0057] Reference numerals: detection device - 100; working electrode - 1; auxiliary electrode - 2; reference electrode - 3; pipeline to be measured - 4; inner wall - 40; insulating cylinders - 10, 20, 30; electrode cores - 11, 21, 31; terminals - 12, 22, 32; tails - 101, 201, 301; heads - 102, 202, 302; computer 5; electrochemical workstation - 6; working surface - 110; first working surface - 211; second working surface - 212; depression - 23; communication groove - 24; accommodation hole - 303. Detailed embodiments

[0058] The present application describes multiple embodiments, but the description is exemplary rather than restrictive, and it is obvious to those of ordinary skill in the art that there can be more embodiments and implementation solutions within the scope covered by the embodiments described in the present application. Although many possible feature combinations are shown in the drawings and discussed in the detailed embodiments, many other combination ways of the disclosed features are also possible. Unless specifically restricted, any feature or element of any embodiment can be combined with any other feature or element in any other embodiment, or can replace any other feature or element in any other embodiment.

[0059] This application includes and contemplates combinations with features and elements known to those of ordinary skill in the art. The disclosed embodiments, features, and elements of this application may also be combined with any conventional features or elements to form a unique inventive solution. Any feature or element of any embodiment may also be combined with features or elements from other inventive solutions to form another unique inventive solution. Accordingly, it should be understood that any feature shown and / or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not limited except as defined by the appended claims and their equivalents. In addition, various modifications and changes may be made within the scope of the appended claims.

[0060] In addition, in describing representative embodiments, the specification may have presented the method and / or process as a particular sequence of steps. However, to the extent that the method or process does not depend on the particular sequence of steps described herein, the method or process should not be limited to the recited particular sequence of steps. As will be understood by those of ordinary skill in the art, other sequences of steps are possible. Accordingly, the particular sequence of steps set forth in the specification should not be construed as limiting the claims. In addition, the claims directed to the method and / or process should not be limited to performing their steps in the order written, as those skilled in the art can readily appreciate that such order may vary and still remain within the spirit and scope of the embodiments of this application.

[0061] As Figures 1 - 9 shown, an embodiment of this application provides a detection device 100 for detecting the corrosion and scaling state of the inner wall 40 of a pipeline 4 to be measured. The detection device 100 of the embodiment of this application includes an electrode assembly and a detection device connected to the electrode assembly.

[0062] As Figure 1 shown, the electrode assembly includes a working electrode 1, a counter electrode 2, and a reference electrode 3. The working electrode 1, the counter electrode 2, and the reference electrode 3 are installed on the pipeline 4 to be measured and cooperate with each other to detect the corrosion and scaling state of the inner wall of the pipeline 4 to be measured.

[0063] The working electrode 1 (WE) in the embodiments of this application is the core electrode of the electrode assembly that detects the location where the metal corrosion reaction occurs. The working electrode 1 is made of metal, such as metal pipes like Fe, Cu, etc., or a metal material with a corrosion scale layer cut from the actual pipeline to be measured. The counter electrode 2 (CE) is used to close the current loop and ensure the conduction of charge in the electrolyte. Usually, an inert material with strong conductivity is selected to avoid interference with the system due to its own reaction. The counter electrode 2 can be a platinum sheet electrode, or a gold electrode, a graphite electrode, a glassy carbon electrode, etc. The reference electrode 3 (RE) is used to provide a stable potential reference, and its potential does not change with the current. The reference electrode 3 can use a silver / silver chloride electrode (Ag / AgCl), or a calomel electrode (SCE), etc.

[0064] As Figures 2 - 7 shown, the working electrode 1, the counter electrode 2, and the reference electrode 3 all include insulating cylinders 10, 20, 30, and electrode cores 11, 21, 31 installed and housed in the insulating cylinders 10, 20, 30. The insulating cylinders 10, 20, 30 include tails 101, 201, 301 extending outside the pipeline 4 to be measured and heads 102, 202, 302 embedded in the pipeline 4 to be measured. The electrode cores 11, 21, 31 are exposed from the front end faces of the heads 102, 202, 302 and can contact the fluid inside the pipeline 4 to be measured to obtain electrochemical signals. Among them, the fluid can be liquid or gas. In this embodiment, water is taken as an example for detailed description.

[0065] It should be noted that: the front end face of each component of each electrode in the electrode assembly of the embodiments of this application refers to the end face facing the inner cavity of the pipeline 4 to be measured, and the rear end face refers to the end face facing away from the inner cavity of the pipeline 4 to be measured.

[0066] The electrode assembly of the embodiments of this application can be embedded in the pipeline 4 to be measured and directly contact the fluid at the inner wall 40 of the pipeline 4 to be measured, so as to accurately collect the parameters of the corrosion situation of the inner wall 40 of the pipeline 4 to be measured and accurately characterize the corrosion and the change process of the pipe scale of the inner wall 40 of the pipeline 4 to be measured.

[0067] Compared with the traditional method that requires destructive excavation of the pipeline 4 to be measured for analyzing the pipe scale on the inner wall 40 of the pipeline 4 to be measured, the installation method of the electrode assembly of the embodiments of this application does not require destructive excavation of the pipeline 4 to be measured, and the installation method is simple and has strong applicability. Moreover, the electrode assembly of the embodiments of this application can continuously capture the electrochemical signals of the electrode cores 11, 21, 31 of the electrode assembly. Compared with the traditional method of scraping the pipe scale and performing structural characterization, it can accurately and real-time characterize the corrosion rate of the pipeline 4 to be measured and the real-time state of the pipe scale.

[0068] The electrode assembly of the embodiments of the present application can be applied to multiple locations in communities and municipal pipelines, and a comprehensive monitoring network for the corrosion conditions of community and municipal water supply pipe networks can be formed to comprehensively characterize the corrosion process of the water supply pipe network.

[0069] As Figure 1 shown, the detection device of the embodiments of the present application includes a computer 5 and an electrochemical workstation 6. The working electrode 1, the auxiliary electrode 2, and the reference electrode 3 further include terminals 12, 22, and 32 connected to the electrode cores 11, 21, and 31. The terminals 12, 22, and 32 are connected to the electrochemical workstation 6 through wires, and the electrochemical workstation 6 is connected to the computer 5.

[0070] When the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 of the electrode assembly of the embodiments of the present application conduct electrochemical tests, the auxiliary electrode 2 forms a loop with the working electrode 1. The electrochemical workstation 6 provides a small current or voltage perturbation, and the voltage and current of the working electrode 1 are measured in the loop, which are the electrochemical signals for evaluating the corrosion and scaling state of the pipeline to be measured. However, since the potential difference between the working electrode 1 and the auxiliary electrode 2 is difficult to accurately measure due to the polarization of the counter electrode (the current causes its potential to drift), a reference electrode 3 with a highly stable known potential (such as Ag / AgCl in KCl solution) is used. Almost no current passes through the reference electrode 3, avoiding the polarization effect. The potential of the working electrode 1 can be accurately measured relative to the stable reference point provided by the reference electrode 3, so as to obtain accurate experimental results. The electrochemical signals obtained by the electrode assembly include the corrosion potential E corr (V), the corrosion current I corr (A / cm 2 ), high-impedance pipe scale or low-impedance pipe scale (binary variable), the pipe scale film resistance R f (Ω / cm 2 ), the pipe scale film capacitance C f (μF / cm 2 ), the charge transfer resistance R ct (Ω / cm 2 ), the double-layer capacitance C dl (μF / cm 2 ), and the acceptor charge density N A or the donor electron density N D (cm -3 ) and other electrochemical indicators. These electrochemical signals are input into the computer 5 for the computer 5 to evaluate the index system of the corrosion tendency of the inner wall of the pipeline and the stability of the pipe scale.

[0071] As Figure 1As shown, the heads 102, 202, 302 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 of the embodiment of the present application and the pipeline 4 to be tested are all detachably embedded in the pipeline 4 to be tested. The side walls of the heads 102, 202, 302 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 in the present embodiment are all provided with external threads, which can be installed in cooperation with the internal threads of the corresponding holes of the pipeline 4 to be tested, so that the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 can be easily disassembled and repaired with the corresponding holes on the pipeline 4 to be tested.

[0072] like Figure 8 , Figure 9 As shown, the working surfaces of the electrode cores 11, 21, 31 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 in the embodiment of the present application are extended in their respective radial directions, and can be kept flush with the fluid direction of the pipeline 4 to be tested after installation, so as to ensure the contact area with the fluid without affecting the flow of the fluid. The working surfaces of the electrode cores 11, 21, 31 are at the inner wall 40 of the pipeline 4 to be tested, so that the corrosion and scaling state of the inner wall position of the pipeline 4 to be tested can be accurately detected.

[0073] like Figure 2 , Figure 3 As shown, the electrode core 11 of the working electrode 1 of the embodiment of the present application is cylindrical and is made of the same base material as the pipeline 4 to be tested or made from the pipeline 4 to be tested. The insulating cylinder 10 of the working electrode 1 is made of polytetrafluoroethylene material, and of course other insulating materials can also be used, which is not limited here.

[0074] When the electrode core 11 is made of materials taken from the pipe 4 to be tested, it includes a working surface 110 that exposes the inner cavity of the pipe 4 to be tested, and the working surface 110 of the electrode core 11 has a corrosion scale layer of the inner wall 40 of the pipe 4 to be tested. In order to achieve a more accurate detection effect, the corrosion scale layer must be kept intact during the collection and installation process. For the pipes that have been laid and used, the pipes have been used for a period of time, and the inner wall has a corrosion scale layer. Therefore, the material of the pipe itself is used to retain the corrosion scale of the pipe. In this way, the electrochemical reaction properties and pipe scale structure characteristics of the actual water supply pipe where the electrode assembly is installed can be effectively characterized, so that the corrosion of the pipe can be more accurately detected in the subsequent detection process.

[0075] Exemplarily, according to the needs of on-site monitoring, the material for making the electrode core 11 of the working electrode 1 is selected from the pipeline 4 to be tested itself. The material cut from the hole manufacturing position of the pipeline 4 to be tested can be used to process it into a columnar electrode core 11 to ensure that the corroded scale surface of the inner wall of the pipeline 4 to be tested is completely retained as the electrode working surface 110.

[0076] like Figure 5As shown in the figure, the auxiliary electrode 2 of the embodiment of the present application is sheet-shaped and includes a first working surface 211 exposed to the inner cavity of the pipeline 4 to be measured and a second working surface 212 opposite to the first working surface 211. A recess 23 for inserting an electrode core 21 into the inner cavity of the pipeline 4 to be measured is provided on the front end surface of the head 20 of the auxiliary electrode 2. A plurality of communication grooves 24 communicating the inner cavity of the pipeline 4 to be measured and the recess 23 are provided along the circumferential direction of the side wall of the recess 23, and water flow can flow into the second working surface 212 of the auxiliary electrode 2 through the communication grooves 24, so as to realize the simultaneous operation of both sides of the auxiliary electrode 2.

[0077] The auxiliary electrode 2 in this embodiment is a circular platinum sheet electrode, and the diameter of the platinum sheet is the same as the diameter of the working surface of the working electrode 1. The platinum sheet is parallel or nearly parallel to the water flow direction, the terminal 22 is connected to the center of the platinum sheet and is located on the central axis of the auxiliary electrode 2. The auxiliary electrode 2 is embedded in the recess 23, the depth range of the recess 23 is 2 mm - 5 mm, and the plurality of communication grooves 24 along the circumferential direction of the side wall of the recess 23 are distributed in a fence shape, so that the water flow in the pipeline 4 to be measured can contact the working surfaces on both sides of the platinum sheet simultaneously.

[0078] As Figure 6 、 Figure 7 As shown in the figure, the electrode core 31 of the reference electrode 3 of the embodiment of the present application has a cylindrical structure, and a receiving hole 303 for receiving the electrode core 31 is provided on the front end surface of the head 302 of the insulating cylinder 30. The reference electrode 3 of the embodiment of the present application adopts an Ag / AgCl electrode, and the electrolyte is a saturated KCl solution. The insulating cylinder 30 of the reference electrode 3 is made of polytetrafluoroethylene.

[0079] The insulating cylinders 10, 20, and 30 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 of the embodiment of the present application all have a cylindrical structure, and the diameters of the electrode cores 11, 21, and 31 are equal, so that the areas of the plurality of electrode cores 11, 21, and 31 are adapted, the surface polarization is smaller, and the error is smaller. The outer diameter ranges of the insulating cylinders 10, 20, and 30 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 are all: greater than 1.0 cm and less than 2.0 cm, so that tools such as pipeline instruments can be used to install the electrode assembly.

[0080] The insulating cylinders 10, 20, and 30 are all hollow cylinders or inner stepped cylinder-shaped parts made of polytetrafluoroethylene. The terminals 12, 22, and 32 made of copper or aluminum metal materials are connected to the rear end surfaces of the electrode cores 11, 21, and 31 at one end, and the other ends are exposed and connected to the electrochemical workstation 6 through wires.

[0081] The pipeline 4 to be measured detected in the embodiment of the present application is made of metal without inner lining. During installation, according to the actual burial situation and on-site installation conditions of the pipeline 3 to be measured, 3 or more holes arranged at equal distances in the circumferential or axial direction can be drilled on the pipeline 4 to be measured for multiple electrodes of one or more groups of electrode assemblies to be embedded in the pipeline 4 to be measured. The holes on the pipeline 4 to be measured are through-hole structures so that multiple electrodes can contact the water flow in the pipeline 4 to be measured. In theory, the closer the three electrodes are, the more accurate the detected value is. However, the closer the electrodes are, the more difficult the hole processing is. Therefore, the distance between adjacent holes is selected to be less than 1.5 cm, which can ensure that the three electrodes are as close as possible and at the same time reduce the difficulty of hole processing. The diameters of multiple holes on the pipeline 4 to be measured in this embodiment are the same, and the center distance between adjacent holes is greater than the hole diameter, and the greater size is about 1 cm. The heads 102, 202, and 302 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 and the three holes are simultaneously processed with matching threads and installed in the holes on the pipeline 4 to be measured by screwing. Sealing rings, etc. can be added to increase the sealing performance.

[0082] The electrode assembly in the embodiment of the present application has various forms of being installed on the pipeline 4 to be measured. In an exemplary embodiment, as Figure 8 shown, the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 are arranged at intervals along the water flow direction, and the working electrode 1 is located between the auxiliary electrode 2 and the reference electrode 3. In another exemplary embodiment, as Figure 9 shown, the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 are arranged at intervals along the circumference of the pipeline 4 to be measured, and the working electrode 1 is located between the auxiliary electrode 2 and the reference electrode 3. In both examples, the working electrode 1 is arranged between the auxiliary electrode 2 and the reference electrode 3, so that both the auxiliary electrode 2 and the reference electrode 3 can cooperate with the working electrode 1 to work.

[0083] In the embodiment of the present application, multiple electrodes of the electrode assembly can be installed in the holes on the pipeline 4 to be measured by screwing. When the installation is completed, the working surfaces of each electrode are closely attached to the inner wall of the pipeline 4 to be measured. Then, an electrochemical workstation 6 can perform electrochemical signal tests on the electrode assembly, including polarization curves and AC impedance spectra. The computer 5 collects electrochemical signals such as the corrosion current, corrosion resistance, and AC impedance of each electrode, and analyzes to obtain the corrosion process of the working electrode and the characteristics of the corrosion products.

[0084] As Figure 10 shown, the embodiment of the present application provides a manufacturing method of the electrode assembly as described in any of the above embodiments, including the following operations:

[0085] S1. Manufacture the electrode cores 11, 21, and 31 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3. The electrode core 11 of the working electrode 1 is made of the same base material as the pipeline 4 to be measured, or is made by taking materials from the pipeline 4 to be measured and using the corroded scale surface of the obtained materials as the working surface 110 of the electrode core 11.

[0086] S2. Manufacture the insulating cylinders 10, 20, and 30 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 using insulating materials, and respectively manufacture the heads 102, 202, and 302 on the sides of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 that can be inserted into the pipeline 4 to be measured.

[0087] As Figure 11 shown, an installation method of the electrode assembly according to any of the above embodiments provided by the embodiment of the present application includes the following operations:

[0088] M1: Make hole positions on the pipe body of the pipeline 4 to be measured that correspond to and are fitted with the heads 102, 202, and 302 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 of the electrode assembly.

[0089] M2: Insert the heads 102, 202, and 302 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 of the electrode assembly into the corresponding hole positions.

[0090] M3: Make the working surfaces of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 of the electrode assembly all level with the fluid direction in the pipeline to be measured and close to the inner wall of the pipeline to be measured.

[0091] The present invention also provides a manufacturing and installation method for the actual application of the electrode assembly according to any of the above embodiments, including the following operations:

[0092] N1. Use a small machine tool or laser cutting to drill a plurality of hole positions on the actual metal water supply pipeline 4 to be measured in the circumferential or axial direction.

[0093] N2. Use a tapping machine or a high-precision tap to tap threads on the side of the electrode housing and the hole positions of the pipeline to be measured to form threads with matching thread profiles, nominal diameters, number of starts, pitches (or leads), and helix directions. Process threads in the through holes of the hole positions of the pipeline 4 to be measured, and process threads on the outer walls of the heads 102, 202, and 302 of the insulating cylinders 10, 20, and 30. The screwed engagement length of the working electrode 1 and the reference electrode 3 matches the depth of the hole positions, and the screwed engagement length of the auxiliary electrode 2 is the sum of the depth of the hole positions and the depth of the recess 23 of the electrode core 21.

[0094] N3. Mount the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 of the electrode assembly on multiple hole positions correspondingly. If the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 are mounted in the axial direction, then the auxiliary electrode 2, the working electrode 1, and the reference electrode 3 are mounted in sequence along the water flow direction; if the working electrode 1, the auxiliary electrode 2, and the reference electrode 3 are mounted in the circumferential direction, then the working electrode 1 is located between the auxiliary electrode 2 and the reference electrode 3.

[0095] The detection system 100 of the embodiment of the present application can be applied to various types of pipelines 4 to be measured, and can effectively detect the corrosion state of the pipelines 4 to be measured.

[0096] Exemplarily, install the detection device 100 for monitoring the corrosion state of the pipeline of the embodiment of the present application on a DN100 ductile iron pipeline to be measured (pipe wall thickness 9 mm) that passes through a pipeline well to be measured and has a pipe age of 10 years. The specific operation is as follows:

[0097] (1) Fabricate the auxiliary electrode 2. The working surface of the electrode core 21 is a circular platinum sheet with a diameter of about 8 mm. The platinum sheet is closely attached to the insulating cylinder 20 and extends into the end face of the pipeline to be measured. The terminal 22 is connected to the center of the platinum sheet and is located on the central axis of the auxiliary electrode 2. The insulating cylinder 20 is made of polytetrafluoroethylene, and the outer diameter of the insulating cylinder 20 is about 14 mm. The end face of the head 202 of the insulating cylinder 20 is provided with a depression 23 with a diameter of about 8 mm and a depth of about 2 mm. The side wall of the depression 23 is provided with a communication groove 24, and the communication groove 24 enables the external aqueous solution to contact the working surfaces on both sides of the platinum sheet simultaneously.

[0098] (2) Fabricate the reference electrode 3. The reference electrode 3 is a columnar structure as a whole. The electrode core 31 of the reference electrode 3 uses an Ag / AgCl electrode, and the electrolyte is a saturated KCl solution. The insulating cylinder 30 is made of polytetrafluoroethylene, and the outer diameter is about 14 mm.

[0099] (3) Fabricate the working electrode 1. Use a small hole opener to drill 3 hole positions with a diameter of about 12 mm axially at the top of the pipeline 4 to be measured. The center distance between adjacent holes is about 22 mm. Take a cylindrical pipe wall material drilled by the hole opener, polish other surfaces except the inner wall pipe scale surface, and polish it into a cylindrical iron-based material with a diameter of about 8 mm as the electrode core 11. Connect the copper terminal 12 to the center of the cylindrical iron-based material. The corrosion scale layer on the iron-based material is used as the working surface 110. Package the external polytetrafluoroethylene material to make the insulating cylinder 10, and then add the terminal 12 at the end to make a columnar working electrode 1. The outer diameter of the working electrode 1 is about 14 mm.

[0100] (4) Use a tap to grind internal threads on the inner sides of three holes at the top of the pipeline 4 to be measured. The thread model can be Rp1 / 4, and the thread engagement length is approximately 9 mm for the through-hole. Use a threading machine to grind external threads on the side shells of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3. The thread model is R1 1 / 4. The thread engagement length of the working electrode 1 and the reference electrode 3 is 9 mm, and the thread engagement length of the auxiliary electrode 2 is approximately 11 mm.

[0101] (5) In the direction of water flow, sequentially screw the auxiliary electrode 2, the working electrode 1, and the reference electrode 3 into the hole positions to complete the installation.

[0102] Exemplarily, for installing a detection device 100 for monitoring the corrosion state of a pipeline on a new ductile iron pipeline 4 to be laid (with a pipe wall thickness of approximately 11 mm and DN200), the specific operation is as follows:

[0103] (1) Fabricate the auxiliary electrode 2. The working surface of the electrode core 21 is a circular platinum sheet with a diameter of approximately 8 mm. The platinum sheet is parallel to and closely adheres to the end face of the insulating cylinder 20 extending into the pipeline 4 to be measured. The terminal 22 is connected to the center of the platinum sheet and is located on the central axis of the auxiliary electrode 2. The insulating cylinder 20 is made of polytetrafluoroethylene with an outer diameter of approximately 14 mm. The end face of the head 202 of the insulating cylinder 20 extending into the pipeline to be measured is provided with a flat cylindrical depression 23 with a bottom diameter of approximately 8 mm and a depth of approximately 2 mm. The side wall of the groove 23 is provided with a plurality of communication grooves 24 in the circumferential direction. The groove 23 communicates with the communication grooves 24, enabling the external aqueous solution to contact the working surfaces on both sides of the platinum sheet simultaneously.

[0104] (2) Fabricate the reference electrode 3. The reference electrode uses an Ag / AgCl electrode, and the electrolyte is a saturated KCl solution. The reference electrode 3 is a columnar structure, and the insulating cylinder 30 is made of polytetrafluoroethylene with an outer diameter of approximately 14 mm.

[0105] (3) Fabricate the working electrode 1. Use a small hole cutter to sequentially drill 3 holes with a diameter of approximately 12 mm in the circumferential direction at the top of the pipeline 4 to be measured. The center distance between adjacent holes is approximately 22 mm. Cut a cylindrical ductile iron substrate taken from the hole into a cylindrical iron-based material with a diameter of approximately 8 mm and a height of approximately 10 mm, and grind and polish it to make the electrode core 31. Connect the copper terminal 12 to the center of the rear end of the cylindrical iron-based material, and expose the front end as the working surface 110. Package the insulating cylinder 10 made of polytetrafluoroethylene outside the cylindrical iron-based material to make the working electrode 1, and the outer diameter of the working electrode 1 is approximately 14 mm.

[0106] (4) Use a tap to machine internal threads on the inner sides of three hole positions at the top of the pipeline 4 to be measured. The thread model is Rp1 / 4, and the thread engagement length is 11 mm for through holes. Use a threading machine to grind external threads on the side shells of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3. The thread model is R1 1 / 4. The thread engagement length of the working electrode 1 and the reference electrode 3 is 11 mm, and the thread engagement length of the auxiliary electrode 2 is approximately 13 mm.

[0107] (5) In the right-handed direction of the water flow, screw the auxiliary electrode 2, the working electrode 1, and the reference electrode 3 into the hole positions in sequence to complete the installation.

[0108] Exemplarily, at the junction of the community main pipeline and the municipal pipeline, install the detection device 100 for monitoring the corrosion state of the pipeline on the municipal pipeline and the community main pipeline. The municipal pipeline is a ductile iron pipeline to be measured with DN200 (wall thickness 11 mm), and the community main pipeline is a galvanized steel pipe with DN200 (wall thickness 9.5 mm). The specific operation is as follows:

[0109] (1) Fabricate two auxiliary electrodes 2. The working surface of the electrode core 21 is a circular platinum sheet with a diameter of 8 mm. The platinum sheet is closely attached to the front of the insulating cylinder 20. The terminal 22 is connected to the center of the platinum sheet and is located on the central axis of the auxiliary electrode 2. The insulating cylinder 20 is made of polytetrafluoroethylene, and the outer diameter of the insulating cylinder 20 is approximately 14 mm. In front of the head 202 of the insulating cylinder 20, there is a flat cylindrical depression 23 with a diameter of approximately 8 mm and a depth of approximately 5 mm. A plurality of communication grooves 24 are provided along the circumferential direction on the side wall of the depression 23, and the depression 23 communicates with the communication grooves 24, so that the external aqueous solution can contact the working surfaces on both sides of the platinum sheet simultaneously.

[0110] (2) Fabricate two reference electrodes 3. The electrode core 31 of the reference electrode 3 uses an Ag / AgCl electrode, and the electrolyte is a saturated KCl solution; the insulating cylinder 30 of the reference electrode 3 is made of polytetrafluoroethylene. The reference electrode 3 is a columnar structure with an outer diameter of approximately 14 mm.

[0111] (3) Fabricate two working electrodes 1. At the top of the community main pipeline and the municipal pipeline, use a small hole cutter to drill 3 holes with a diameter of approximately 12 mm in sequence in the circumferential direction. The center distance between adjacent two holes is approximately 22 mm. The distance between the two rows of holes does not exceed 20 cm.

[0112] For municipal pipelines, take a cylindrical ductile iron pipe wall material drilled by a hole opener, polish the other surfaces except the inner wall scale surface, and grind it into a cylindrical ductile iron base material with a diameter of 8 mm as the electrode core 11. Connect the center of the cylindrical ductile iron base material to the copper terminal 12, expose the corrosion scale layer on the pipeline 4 as the working surface, and encapsulate polytetrafluoroethylene on the outside as the insulating cylinder 10 to make the working electrode 1. The outer diameter of the working electrode 1 is about 14 mm. Use a tap to process internal threads on the inner sides of three hole positions at the top of the municipal pipeline 4. The thread model is Rp 1 / 4, and the thread engagement length is 11 mm for the through hole. Use a threading machine to process external threads on the side insulating cylinders 10, 20, and 30 of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3. The thread model is R1 1 / 4. The thread engagement lengths of the working electrode 1 and the reference electrode 3 are 11 mm, and the thread engagement length of the auxiliary electrode 2 is 16 mm.

[0113] For community pipelines, take a cylindrical galvanized steel pipe wall material drilled by a hole opener, polish the other surfaces except the inner wall scale surface, and grind it into a cylindrical galvanized steel base material with a diameter of about 8 mm as the electrode core 11. Connect the center of the cylindrical galvanized steel base material to the copper terminal 12, expose the corrosion scale layer on the pipeline as the working surface, and encapsulate an insulating cylinder 10 made of polytetrafluoroethylene on the outside to make a cylindrical working electrode 1. The outer diameter of the working electrode 1 is about 14 mm. Use a tap to process internal threads on the inner sides of three holes at the top of the community pipeline to be measured. The thread model is Rp 1 / 4, and the thread engagement length is about 9.5 mm. Use a threading machine to grind external threads on the side shells of the working electrode 1, the auxiliary electrode 2, and the reference electrode 3. The thread model is R1 1 / 4; the thread engagement lengths of the working electrode 1 and the reference electrode 3 are about 9.5 mm, and the thread engagement length of the auxiliary electrode 2 is about 14.5 mm.

[0114] (4) In the clockwise direction of the water flow, sequentially screw the two groups of auxiliary electrodes 2, the working electrode 1, and the reference electrode 3 into the hole positions of the municipal pipeline and the main community pipeline to complete the installation.

[0115] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0116] Furthermore, terms such as "first", "second", etc. are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include at least one such feature.

[0117] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0118] In the present application, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, "connected" may be a fixed connection, a detachable connection, or integral; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0119] In the present application, unless otherwise clearly specified and defined, a first feature being "on" or "under" a second feature may be that the first and second features are in direct contact, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. A first feature being "under", "beneath" and "underneath" a second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0120] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "example", "specific example" or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0121] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. An electrode assembly, characterized in that: include: A working electrode, an auxiliary electrode and a reference electrode, wherein the working electrode, the auxiliary electrode and the reference electrode are arranged to be installed in the pipeline to be tested and detect the corrosion and scaling state of the inner wall of the pipeline to be tested; The working electrode, auxiliary electrode and reference electrode all include an insulating cylinder and an electrode core accommodated in the insulating cylinder; the insulating cylinder includes a tail portion extending out of the pipeline to be tested and a head portion embedded in the pipeline to be tested, and the electrode core is exposed from the front end surface of the head portion and can contact the fluid in the pipeline to be tested.

2. The electrode assembly according to claim 1, characterized in that: The working surfaces of the electrode cores of the working electrode, the auxiliary electrode and the reference electrode are extended in their respective radial directions and are flush with the direction of the fluid in the pipeline to be tested; The electrode cores of the working electrode, the auxiliary electrode and the reference electrode are arranged on the inner wall of the pipeline to be tested.

3. The electrode assembly according to claim 1, characterized in that: The heads of the working electrode, the auxiliary electrode and the reference electrode are all detachably embedded in the pipeline to be tested; The side walls of the heads of the working electrode, the auxiliary electrode and the reference electrode are all provided with external threads, and can be installed in cooperation with the internal threads of the corresponding holes of the pipeline to be tested.

4. The electrode assembly according to claim 1, characterized in that: The diameters of the electrode cores of the working electrode and the auxiliary electrode are equal; The outer diameter range of the insulating cylinders of the working electrode, the auxiliary electrode and the reference electrode is: greater than 1.0 cm and less than 2.0 cm.

5. The electrode assembly according to claim 1, characterized in that: The electrode core of the working electrode is cylindrical and is made of the same base material as the pipeline to be tested; or, The electrode core of the working electrode is made from the material of the pipeline to be tested, and comprises a working surface exposed to the inner cavity of the pipeline to be tested, and the working surface has a corrosion scale layer of the inner wall of the pipeline to be tested.

6. The electrode assembly according to claim 1, characterized in that: The electrode core of the auxiliary electrode is in the shape of a disc and comprises a first working surface exposed to the inner cavity of the pipeline to be tested and a second working surface opposite to the first working surface; The front end of the head of the auxiliary electrode is provided with a depression extending into the inner cavity of the pipeline to be tested and used to install its own electrode core, and the side wall of the depression is circumferentially provided with a plurality of connecting grooves connecting the inner cavity of the pipeline to be tested and the depression, so that the fluid in the pipeline to be tested flows into the second working surface of the auxiliary electrode through the connecting grooves.

7. The electrode assembly according to claim 1, characterized in that: The electrode core of the reference electrode is cylindrical, and the front end surface of the reference electrode head is provided with a receiving hole for receiving the electrode core thereof.

8. A detection device, characterized in that: include: The electrode assembly according to any one of claims 1 to 7, and a detection device connected to the electrode assembly; The detection device includes an electrochemical workstation connected to the electrode assembly and a computer connected to the electrochemical workstation.

9. The detection device according to claim 8, characterized in that: Also included is a pipeline to be tested, wherein the pipeline to be tested is provided with a plurality of holes, and the spacing between adjacent holes is less than 1.5 cm; The heads of the working electrode, the auxiliary electrode and the reference electrode of the electrode assembly are respectively installed in the corresponding holes.

10. The detection device according to claim 8, characterized in that: The working electrode, the auxiliary electrode and the reference electrode are arranged at intervals along the water flow direction of the pipeline to be tested, and the working electrode is located between the auxiliary electrode and the reference electrode; or, The working electrode, the auxiliary electrode and the reference electrode are arranged at intervals along the circumference of the pipeline to be measured, and the working electrode is located between the auxiliary electrode and the reference electrode.

11. A method for manufacturing an electrode assembly according to any one of claims 1 to 7, characterized in that: include: Manufacturing electrode cores of working electrodes, auxiliary electrodes and reference electrodes, wherein the electrode core of the working electrode is manufactured using the same substrate as the pipeline to be tested or using the corrosion scale surface of the material obtained from the pipeline to be tested as the working surface of the electrode core; The insulating cylinders of the working electrode, the auxiliary electrode and the reference electrode are made of insulating materials, and heads capable of being embedded in the pipeline to be tested are respectively made on the sides of the working electrode, the auxiliary electrode and the reference electrode.

12. A method for installing an electrode assembly according to any one of claims 1 to 7, characterized in that: include: Holes corresponding to the heads of the working electrode, auxiliary electrode and reference electrode of the electrode assembly are manufactured on the pipe body of the pipe to be tested; Embed the heads of the working electrode, the auxiliary electrode and the reference electrode of the electrode assembly into the corresponding holes; The working surfaces of the working electrode, the auxiliary electrode and the reference electrode of the electrode assembly are all arranged to be flush with the direction of the fluid in the pipeline to be tested and are arranged at the inner wall of the pipeline to be tested.

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