CN113484396B - Corrosion monitoring device and method for coupling four-probe potential drop measurement and tow electrode - Google Patents
Corrosion monitoring device and method for coupling four-probe potential drop measurement and tow electrode Download PDFInfo
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Abstract
The invention provides a corrosion monitoring sensor coupling four-probe potential drop measurement and a wire beam electrode technology, a monitoring device and a monitoring method, wherein the monitoring sensor comprises a sensor outer shell, a working electrode array, a temperature compensation electrode, a reference electrode, a test probe, a probe fixing plate and the like; the top of the sensor outer shell is fixedly provided with a pressure-resistant watertight connector for connecting the multicore shielding wires; the working electrode array, the temperature compensation electrode and the reference electrode are fixedly arranged on the bottom surface of the sensor shell; the working electrode array comprises a plurality of working electrodes; the temperature compensation electrode and each working electrode are connected with 4 test probes; the reference electrode is connected with 1 test probe; the top of the test probe is fixed on the probe fixing plate. The monitoring sensor provided by the invention can synchronously monitor local corrosion depth and cathode and anode current and potential distribution on line.
Description
Technical Field
The invention relates to the technical field of automatic monitoring, in particular to a corrosion monitoring sensor, a monitoring device and a monitoring method for coupling four-probe potential drop measurement and a tow electrode technology.
Background
The corrosion problem of the metal structure brings huge loss to national economy. In various fields of national economy, various metal structures are often applied, for example: steel pipelines used in oil and gas transportation, steel hulls used in ship bodies, steel oil storage tanks, steel piles of offshore wind power generation structures and the like, steel bars in steel-concrete structures, and the metal structures all suffer from corrosion problems of different degrees. Due to non-uniformity of metal materials and non-uniformity of external environments, corrosion of a metal structure in a natural environment is often non-uniform, namely, corrosion rates of different areas of the metal surface have obvious differences, obvious cathode and anode distribution exists on the surface, and corrosion current between the cathode and the anode can further aggravate the non-uniformity degree of corrosion. Compared with general corrosion, the hazard caused by non-uniform corrosion is more serious, the non-uniform corrosion is more hidden, the caused accident is often sudden damage, generally, the safety and stability of the whole metal steel structure are often dependent on the corrosion state of the most severely corroded area, and therefore, the grasping of the corrosion state of the metal structure is of great importance. The corrosion state of the current steel structure can be mastered by placing the corrosion monitoring sensor, and the current corrosion rate is measured, so that a basis is provided for the formulation of the corrosion prevention scheme, the effectiveness of the current corrosion prevention scheme can be evaluated, and the corrosion prevention strategy can be timely adjusted according to the monitoring result, so that the corrosion prevention method has great significance for the safety of the maintenance structure.
Currently, corrosion monitoring means commonly used in industry can be divided into two categories:
the first category is based on environmental parameter monitoring technology, i.e. by measuring environmental parameters related to corrosion, and combining with the existing classical corrosion theory or corrosion model, the current corrosion state is evaluated, and common technologies are as follows: conductivity monitoring, temperature monitoring, solution oxygen content monitoring, pH value monitoring, humidity monitoring, chloride ion concentration monitoring and the like, because the corrosion environment is complex and changeable, the environment factors influencing the corrosion rate are more, the existing corrosion theoretical model is not perfect, the corrosion state cannot be estimated through the environment parameters, and the corrosion rate cannot be calculated.
The second type is a monitoring technology based on corrosion probes, namely, placing corrosion probes made of the same material around a monitored object, and estimating the corrosion state of the whole structure by testing the corrosion state of the probes, wherein the common corrosion probes are as follows: resistive probes, electrochemical three-electrode probes, weightless hanging pieces, and the like. Because corrosion often has inhomogeneous characteristics, when local corrosion occurs, the corrosion rates of different areas on the surface of steel have obvious differences, and the surface has cathode and anode distribution, and the corrosion current between the cathode and the anode can further aggravate the local corrosion degree. Conventional corrosion probe-based monitoring techniques can only measure the average corrosion information of a region, but cannot reflect the non-uniformity of localized corrosion.
The third type is a monitoring technology based on a multi-electrode system, namely, corrosion probes arranged in an array are placed around a monitored object, and the corrosion state is judged by monitoring potential information of each electrode and current between each electrode. The method has the advantages of higher sensitivity, capability of obtaining the current corrosion rate and identifying the corrosion type to a certain extent, but the technology relies on an external solution environment to provide electrical communication, so that the method has the risk of failure in actual engineering use and is not suitable for long-term monitoring.
Disclosure of Invention
Aiming at the technical problems of the existing corrosion monitoring means, the invention provides a corrosion monitoring sensor, a monitoring device and a monitoring method for coupling four-probe potential drop measurement and a tow electrode technology.
The invention adopts the following technical means:
a corrosion monitoring sensor for coupling four-probe potential drop measurement and a wire bundle electrode technology comprises a sensor outer shell, a working electrode array, a temperature compensation electrode, a reference electrode, a test probe, a probe fixing plate, a wire and a PCB (printed circuit board) which are positioned in the sensor outer shell; an epoxy resin pouring sealant is filled in the sensor outer shell;
the top of the sensor outer shell is fixedly provided with a pressure-resistant watertight connector for connecting the multicore shielding wires;
the working electrode array, the temperature compensation electrode and the reference electrode are fixedly arranged on the bottom surface of the sensor shell; the working electrode array comprises a plurality of working electrodes; the material of the temperature compensation electrode is the same as that of the working electrode, and chromium oxide ceramic is sprayed on the lower surface of the temperature compensation electrode; the temperature compensation electrode and each working electrode are connected with 4 test probes which are arranged in a square shape; the reference electrode is a cylindrical solid reference electrode, and is connected with 1 test probe;
the top of the test probe is fixed on the probe fixing plate and is connected to the PCB through the lead, and the PCB is connected to the pressure-resistant watertight connector through the lead.
Further, the working electrode array consists of m 2 The working electrodes with the same size are arranged in an m multiplied by m square array, the bottom surfaces of the working electrodes are used as working surfaces, and the bottom surfaces are square in shape.
Further, the working electrode working surface has a side length greater than twice the working electrode thickness.
Further, the temperature compensation electrode and 4 test probes connected with the working electrode are arranged in a square shape, and contact points of the test probes and the temperature compensation electrode or the working electrode are located at 4 vertexes of the upper surface, wherein 2 test probes on one side are current probes, and 2 test probes on the other side are voltage probes.
The invention also provides a corrosion monitoring device for coupling the four-probe potential drop measurement and the wire beam electrode technology, which comprises a corrosion monitoring sensor for coupling the four-probe potential drop measurement and the wire beam electrode technology, a multi-channel four-probe tester, a multi-channel digital voltmeter, a multi-channel zero-resistance ammeter, a relay group A, a relay group B and a relay group C;
the measuring end of the multichannel four-probe tester is connected with a working electrode array and a temperature compensation electrode in the corrosion monitoring sensor through the relay group A and is used for measuring the voltages of the working electrode and the temperature compensation electrode, so that the wall thickness loss of the working electrode is obtained according to the voltages;
the measuring end of the multichannel digital voltmeter is connected with the working electrode array and the reference electrode in the corrosion monitoring sensor through the relay group B and is used for measuring potential difference between the working electrode and the reference electrode;
and the measuring end of the multichannel zero-resistance ammeter is connected with the working electrode array in the corrosion monitoring sensor through the relay group C and is used for measuring the galvanic current between the working electrodes.
The invention also provides a monitoring method for the coupled four-probe potential drop measurement and the wire beam electrode technology, which adopts the corrosion monitoring device for the coupled four-probe potential drop measurement and the wire beam electrode technology, and specifically comprises the following steps:
s01: the corrosion monitoring sensor surface pretreatment: the electrode surface is required to be pretreated before the corrosion monitoring sensor is used, alcohol is used for cleaning the electrode surface, and cold air is used for drying;
s02: installing the corrosion monitoring sensor: placing the corrosion monitoring sensor in an environment needing corrosion monitoring, and connecting the pressure-resistant watertight connector at the top of the corrosion monitoring sensor into the multi-channel four-probe tester, the multi-channel digital voltmeter and the multi-channel zero-resistance ammeter through a multi-core shielding wire;
s03: electrode voltage was tested using four probe technique: controlling the relay group A to be started, simultaneously controlling the multichannel four-probe tester to sequentially test the voltages of the working electrode and the temperature compensation electrode, and recording test data;
s04: electrode potential was tested using the tow electrode technique: controlling the relay group B to be opened, simultaneously controlling the multichannel digital voltmeter to sequentially test potential differences between each working electrode and each reference electrode, and recording test data;
s05: the current between the electrodes is tested by using the tow electrode technology: controlling the relay group C to be started, controlling the multichannel zero-resistance ammeter to test the couple current between the working electrodes, and recording test data;
s06: data processing and analysis: calculating the wall thickness loss of each working electrode based on the voltage result measured by the multichannel four-probe tester, and drawing a cloud picture; drawing a potential cloud picture based on the measurement result of the multichannel digital voltmeter; and drawing a current cloud chart based on the couple current test result of the multichannel zero-resistance ammeter.
Further, in step S06, a calculation formula for calculating the wall thickness loss Δδ of each working electrode according to the electrode voltage result measured by the multi-channel four-probe tester is as follows:
wherein U is m Representing the initial voltage of the working electrode,indicating the voltage of the corroded working electrode, l m Representing the spacing, delta, between adjacent test probes on the working electrode m Indicating the initial thickness of the working electrode, U c Representing the temperature compensated electrode initial voltage, +.>The voltage after the electrode corrosion of the temperature compensation electrode is represented by X, the voltage ratio in the initial state is represented by X * The post-etch voltage ratio is shown.
Compared with the prior art, the invention has the following advantages:
the corrosion monitoring sensor, the monitoring device and the monitoring method for the coupled four-probe potential drop measurement and the tow electrode technology can synchronously monitor local corrosion depth and cathode and anode current and potential distribution on line, and can realize screening and monitoring of on-line electrochemical corrosion damage and non-electrochemical corrosion damage and on-line distinguishing of macro-cell corrosion components and micro-cell corrosion components.
Based on the reasons, the method can be widely popularized in the field of monitoring the local corrosion damage of the metal material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a corrosion monitoring sensor according to the present invention.
FIG. 2 is a schematic diagram of the mounting position of the test probe for connecting the working electrode and the temperature compensation electrode according to the present invention.
FIG. 3 is a schematic diagram of a corrosion monitoring device for coupling four-probe potential drop measurement and tow electrode technology according to the present invention.
FIG. 4 is a schematic diagram of the working principle of the corrosion monitoring device of the coupled four-probe potential drop measurement and tow electrode technology according to the present invention.
FIG. 5 is a timing diagram of a method for monitoring the coupled four-probe potential drop measurement and the wire-beam electrode technique according to the present invention.
FIG. 6 is a flow chart of a method for corrosion monitoring coupled with four probe potential drop measurement and tow electrode technology according to the present invention.
In the figure: 1. a working electrode array; 2. a temperature compensation electrode; 3. a reference electrode; 4. a test probe; 5. a probe fixing plate; 6. a wire; 7. a PCB circuit board; 8. a sensor housing; 9. epoxy sealant; 10. a pressure-resistant watertight connector; 11. a voltage probe; 12. a current probe.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.
Example 1
As shown in fig. 1, the invention provides a corrosion monitoring sensor for coupling four-probe potential drop measurement and wire-beam electrode technology, which comprises a sensor outer shell 8, a working electrode array 1, a temperature compensation electrode 2, a reference electrode 3, a test probe 4, a probe fixing plate 5, a wire 6 and a PCB circuit board 7, wherein the working electrode array 1, the temperature compensation electrode 2, the reference electrode 3, the test probe 4, the probe fixing plate 5, the wire 6 and the PCB circuit board 7 are positioned in the sensor outer shell 8; the inside of the sensor outer shell 8 is filled with epoxy resin pouring sealant 9 which is not contacted with the external corrosion environment; the corrosion monitoring sensor contacts with the corrosion environment through the bottom surface of the sensor outer shell 8, and all other parts are placed in the sensor outer shell 8;
the top of the sensor outer shell 8 is fixedly provided with a pressure-resistant watertight connector 10 for connecting a multi-core shielding wire;
the working electrode array 1, the temperature compensation electrode 2 and the reference electrode 3 are fixedly arranged on the bottom surface of the sensor shell 8; the working electrode array 1 comprises a plurality of working electrodes; the material of the temperature compensation electrode 2 is the same as that of the working electrode, and the lower surface of the temperature compensation electrode 2 is sprayed with chromium oxide ceramic to prevent the chromium oxide ceramic from being in direct contact with corrosive media; the temperature compensation electrode 2 and each working electrode are connected with 4 test probes 4 which are arranged in a square shape; the reference electrode 3 is a cylindrical solid reference electrode, and 1 test probe 4 is connected to the reference electrode 3;
the top of the test probe 4 is fixed on the probe fixing plate 5 and is connected to the PCB 7 through the wire 6, and the PCB 7 is connected to the pressure-resistant watertight connector 10 through the wire 6.
Further, the working electrode array 1 is formed by m 2 The working electrodes with the same size are arranged in an m multiplied by m square array, the bottom surfaces of the working electrodes are used as working surfaces, and the bottom surfaces are square in shape.
Preferably, the working electrode array 1 is formed by arranging 16 working electrodes with the same size in a 4×4 square array.
Further, the working electrode array 1 is made of carbon steel, aluminum alloy, stainless steel, magnesium alloy or low alloy steel.
Further, the size and thickness of the working surface of the working electrode array 1, and the distance between two adjacent working electrodes can be adjusted according to the actual measurement requirement, so as to achieve better measurement accuracy, the side length of the working surface of the working electrode is longer than twice the thickness of the working electrode; and, the distance between two adjacent electrodes is reduced as much as possible while ensuring insulation between the respective electrodes.
Further, the temperature compensation electrode 2 and the 4 test probes connected with the working electrode are arranged in a square shape, the contact points of the test probes 4 and the temperature compensation electrode 2 or the working electrode are located at 4 vertexes of the upper surface, wherein 2 test probes 4 on one side are current probes 12 for applying constant current, 2 test probes 4 on the other side are voltage probes 11 for testing voltage.
Further, the sensor outer shell 8 is made of a high-hardness nylon material;
further, the material of the working electrode array 1 may be determined according to the material of the monitored structure, and may be carbon steel, aluminum alloy, stainless steel, magnesium alloy, low alloy steel or any other metal material.
The invention also provides a corrosion monitoring device for coupling the four-probe potential drop measurement and the wire beam electrode technology, which comprises a corrosion monitoring sensor for coupling the four-probe potential drop measurement and the wire beam electrode technology, a multi-channel four-probe tester, a multi-channel digital voltmeter, a multi-channel zero-resistance ammeter, a relay group A, a relay group B and a relay group C;
the measuring end of the multichannel four-probe tester is connected with a working electrode array and a temperature compensation electrode in the corrosion monitoring sensor through the relay group A and is used for measuring the voltages of the working electrode and the temperature compensation electrode, so that the wall thickness loss of the working electrode is obtained according to the voltages;
the measuring end of the multichannel digital voltmeter is connected with the working electrode array and the reference electrode in the corrosion monitoring sensor through the relay group B and is used for measuring potential difference between the working electrode and the reference electrode;
and the measuring end of the multichannel zero-resistance ammeter is connected with the working electrode array in the corrosion monitoring sensor through the relay group C and is used for measuring the galvanic current between the working electrodes.
Further, the corrosion monitoring device for coupling the four-probe potential drop measurement and the wire bundle electrode technology further comprises a computer, wherein the multi-channel four-probe tester, the multi-channel digital voltmeter, the multi-channel zero resistance ammeter, the relay group A, the relay group B and the relay group C are all connected to the computer; the computer can send control signals to control the relay group A, the relay group B and the relay group C, and the computer can collect measurement signals sent by the multi-channel four-probe tester, the multi-channel digital voltmeter and the multi-channel zero-resistance ammeter and display measurement results in a graphical mode.
Furthermore, each channel of the multi-channel four-probe tester is provided with four measuring terminals, wherein two measuring terminals are connected with an internal constant current source and can output constant current, and the other two measuring terminals are connected with an internal high-precision data acquisition card and can measure voltage.
Further, each channel of the multi-channel digital voltmeter has two measurement terminals, one of which is connected to the working electrode and the other of which is connected to the reference electrode.
Further, each channel of the multichannel zero-resistance ammeter is provided with a measuring terminal for connecting the working electrode.
The invention also provides a monitoring method for the coupled four-probe potential drop measurement and the wire beam electrode technology, which is characterized by adopting the corrosion monitoring device for the coupled four-probe potential drop measurement and the wire beam electrode technology, and specifically comprises the following steps:
s01: the corrosion monitoring sensor surface pretreatment: the electrode surface is required to be pretreated before the corrosion monitoring sensor is used, alcohol is used for cleaning the electrode surface, and cold air is used for drying;
s02: installing the corrosion monitoring sensor: placing the corrosion monitoring sensor in an environment needing corrosion monitoring, and connecting the pressure-resistant watertight connector at the top of the corrosion monitoring sensor into the multi-channel four-probe tester, the multi-channel digital voltmeter and the multi-channel zero-resistance ammeter through a multi-core shielding wire;
s03: electrode voltage is tested by using a four-probe technology, so that wall thickness loss (corrosion depth) of the working electrode is obtained: the computer sends an instruction to control the relay group A to be started, and simultaneously controls the multichannel four-probe tester to sequentially test the voltages of the working electrode and the temperature compensation electrode, and records test data;
s04: electrode potential was tested using the tow electrode technique: the computer sends an instruction to control the relay group B to be started, and simultaneously controls the multichannel digital voltmeter to sequentially test potential differences between each working electrode and each reference electrode, and records test data;
s05: the current between the electrodes is tested by using the tow electrode technology: the computer sends an instruction to control the relay group C to be started, the multichannel zero-resistance ammeter is controlled to test the couple current between the working electrodes, and test data are recorded;
s06: data processing and analysis: calculating the wall thickness loss of each working electrode based on the voltage result measured by the multichannel four-probe tester, and drawing a cloud picture; drawing a potential cloud picture based on the measurement result of the multichannel digital voltmeter; and drawing a current cloud chart based on the couple current test result of the multichannel zero-resistance ammeter.
Further, in step S06, a calculation formula for calculating the wall thickness loss Δδ of each working electrode according to the electrode voltage result measured by the multi-channel four-probe tester is as follows:
wherein U is m Representing the initial voltage of the working electrode,indicating the voltage of the corroded working electrode, l m Representing the spacing, delta, between adjacent test probes on the working electrode m Indicating the initial thickness of the working electrode, U c Representing the temperature compensated electrode initial voltage, +.>The voltage after the electrode corrosion of the temperature compensation electrode is represented by X, the voltage ratio in the initial state is represented by X * The post-etch voltage ratio is shown.
In the invention, the voltage calculation formula for testing the working electrode and the temperature compensation electrode by the multichannel four-probe tester by using the four-probe technology is as follows:
wherein K is m Representing the edge correction factor, l, of the working electrode c Representing the spacing, delta, between adjacent test probes on the temperature compensation electrode c Representing the thickness, K, of the temperature-compensated electrode c Representing an edge correction factor of the working electrode, wherein I represents input current of the multi-channel four-probe tester, and sigma represents conductivity;
the formula for calculating the voltage ratio X is:
after the corrosion of the surface of the working electrode, the thickness is reduced to delta m Δδ, X of the voltage ratio * The relationship with the thickness loss Δδ is:
comparing the initial state voltage ratio X with the post-etch voltage ratio X * By comparison, i.eThe calculation formula of the wall thickness loss delta can be obtained, wherein delta of the working electrode is known m And l m On the premise of (2), the wall thickness loss delta of the working electrode can be calculated.
The corrosion monitoring sensor, the monitoring device and the monitoring method for the coupled four-probe potential drop measurement and the tow electrode technology can synchronously monitor local corrosion depth and cathode and anode current and potential distribution on line, and can realize screening and monitoring of on-line electrochemical corrosion damage and non-electrochemical corrosion damage and on-line distinguishing of macro-cell corrosion components and micro-cell corrosion components.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the technical solutions according to the embodiments of the present invention.
Claims (6)
1. The corrosion monitoring device is characterized by comprising a corrosion monitoring sensor, a multi-channel four-probe tester, a multi-channel digital voltmeter, a multi-channel zero-resistance ammeter, a relay group A, a relay group B and a relay group C, wherein the corrosion monitoring sensor is used for coupling the four-probe potential drop measurement and the wire beam electrode technology;
the measuring end of the multichannel four-probe tester is connected with a working electrode array and a temperature compensation electrode in the corrosion monitoring sensor through the relay group A and is used for measuring the voltages of the working electrode and the temperature compensation electrode, so that the wall thickness loss of the working electrode is obtained according to the voltages;
the measuring end of the multichannel digital voltmeter is connected with the working electrode array and the reference electrode in the corrosion monitoring sensor through the relay group B and is used for measuring potential difference between the working electrode and the reference electrode;
the measuring end of the multichannel zero-resistance ammeter is connected with the working electrode array in the corrosion monitoring sensor through the relay group C and is used for measuring the galvanic current between the working electrodes;
the corrosion monitoring sensor for coupling the four-probe potential drop measurement and the wire bundle electrode technology comprises a sensor outer shell, a working electrode array, a temperature compensation electrode, a reference electrode, a test probe, a probe fixing plate, a wire and a PCB (printed circuit board) which are positioned in the sensor outer shell; an epoxy resin pouring sealant is filled in the sensor outer shell;
the top of the sensor outer shell is fixedly provided with a pressure-resistant watertight connector for connecting the multicore shielding wires;
the working electrode array, the temperature compensation electrode and the reference electrode are fixedly arranged on the bottom surface of the sensor shell; the working electrode array comprises a plurality of working electrodes; the material of the temperature compensation electrode is the same as that of the working electrode, and chromium oxide ceramic is sprayed on the lower surface of the temperature compensation electrode; the temperature compensation electrode and each working electrode are connected with 4 test probes which are arranged in a square shape; the reference electrode is a cylindrical solid reference electrode, and is connected with 1 test probe;
the top of the test probe is fixed on the probe fixing plate and is connected to the PCB through the lead, and the PCB is connected to the pressure-resistant watertight connector through the lead.
2. The corrosion monitoring device of claim 1, wherein said working electrode array is defined by m 2 The working electrodes with the same size are arranged in an m multiplied by m square array, the bottom surfaces of the working electrodes are used as working surfaces, and the bottom surfaces are square in shape.
3. The corrosion monitoring device of claim 2, wherein said working electrode working surface has a side length greater than twice said working electrode thickness.
4. The corrosion monitoring device for coupling a four-probe potential drop measurement and a tow electrode according to claim 1, wherein 4 test probes connected with the temperature compensation electrode and the working electrode are arranged in a square shape, contact points of the test probes and the temperature compensation electrode or the working electrode are positioned at 4 vertexes of the upper surface, 2 test probes on one side are current probes, and 2 test probes on the other side are voltage probes.
5. A method for monitoring a coupled four-probe potential drop measurement and a wire-beam electrode, characterized in that a corrosion monitoring device for coupled four-probe potential drop measurement and a wire-beam electrode according to any one of claims 1 to 4 is adopted, and specifically comprises the following steps:
s01: the corrosion monitoring sensor surface pretreatment: the electrode surface is required to be pretreated before the corrosion monitoring sensor is used, alcohol is used for cleaning the electrode surface, and cold air is used for drying;
s02: installing the corrosion monitoring sensor: placing the corrosion monitoring sensor in an environment needing corrosion monitoring, and connecting the pressure-resistant watertight connector at the top of the corrosion monitoring sensor into the multi-channel four-probe tester, the multi-channel digital voltmeter and the multi-channel zero-resistance ammeter through a multi-core shielding wire;
s03: electrode voltage was tested using four probe technique: controlling the relay group A to be started, simultaneously controlling the multichannel four-probe tester to sequentially test the voltages of the working electrode and the temperature compensation electrode, and recording test data;
s04: electrode potential was tested using the tow electrode technique: controlling the relay group B to be opened, simultaneously controlling the multichannel digital voltmeter to sequentially test potential differences between each working electrode and each reference electrode, and recording test data;
s05: the current between the electrodes is tested by using the tow electrode technology: controlling the relay group C to be started, controlling the multichannel zero-resistance ammeter to test the couple current between the working electrodes, and recording test data;
s06: data processing and analysis: calculating the wall thickness loss of each working electrode based on the voltage result measured by the multichannel four-probe tester, and drawing a cloud picture; drawing a potential cloud picture based on the measurement result of the multichannel digital voltmeter; and drawing a current cloud chart based on the couple current test result of the multichannel zero-resistance ammeter.
6. The method for coupling four-probe potential drop measurement and filament bundle electrode monitoring according to claim 5, wherein in step S06, a calculation formula for calculating the wall thickness loss Δδ of each working electrode according to the electrode voltage result measured by the multi-channel four-probe tester is as follows:
wherein,representing the initial voltage of the working electrode, +.>Indicating the post-corrosion voltage of the working electrode, +.>Representing the spacing between adjacent test probes on the working electrode, < >>Representing the initial thickness of the working electrode, +.>Representing the temperature compensated electrode initial voltage, +.>Indicating the voltage after corrosion of the temperature compensated electrode, < >>Representing the initial state voltage ratio,the post-etch voltage ratio is shown.
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| CN114659968A (en) * | 2022-03-08 | 2022-06-24 | 中国电建集团华东勘测设计研究院有限公司 | Metal structure corrosion monitoring device under stripping coating in wet environment |
| CN114705731A (en) * | 2022-06-01 | 2022-07-05 | 中国电建集团华东勘测设计研究院有限公司 | Sensor for monitoring stripping depth and corrosion state of damaged part of coating and monitoring method |
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