CN113484396A - Corrosion monitoring sensor, monitoring device and monitoring method for coupling four-probe potential drop measurement and tow electrode technology - Google Patents
Corrosion monitoring sensor, monitoring device and monitoring method for coupling four-probe potential drop measurement and tow electrode technology Download PDFInfo
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Abstract
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, wherein the monitoring sensor comprises a sensor outer shell, and a working electrode array, a temperature compensation electrode, a reference electrode, a test probe, a probe fixing plate and the like which are positioned in the sensor outer shell; a pressure-resistant watertight connector used for connecting a multi-core shielding wire is fixedly arranged at the top of the sensor outer shell; the working electrode array, the temperature compensation electrode and the reference electrode are all fixedly arranged on the bottom surface of the sensor outer 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 be used for synchronously monitoring the local corrosion depth and the current and potential distribution of the anode and the cathode 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 metal structures brings huge losses to national economy. In various areas of the national economy, various metal structures are often applied, for example: the steel pipeline that adopts in the oil and gas transportation, the steel hull that the hull adopted, steel oil storage tank, offshore wind power generation structure's piling bar etc. the reinforcing bar in the steel-concrete structure, these metal construction all can suffer the corrosion problem of different degrees. Due to the non-uniformity of the metal material and the non-uniformity of the external environment, the corrosion of the metal structure in the natural environment is often non-uniform, that is, the corrosion rates of different regions of the metal surface have obvious differences, the surface has obvious cathode and anode distribution, and the corrosion current between the cathode and the anode further aggravates the non-uniform degree of the corrosion. Compared with general corrosion, the harmfulness caused by non-uniform corrosion is much serious, the non-uniform corrosion is more concealed, the caused accidents are often sudden damage, generally speaking, the safety and the stability of the whole metal steel structure are often dependent on the corrosion state of the most serious corrosion area, and therefore the control of the corrosion state of the metal structure is very important. Can master the corrosion state of current steel construction through placing corrosion monitoring sensor, measure current corrosion rate to for the formulation of anticorrosive scheme provides the basis, also can assess the validity of current anticorrosive scheme, in time adjust anticorrosive strategy according to the monitoring result, have great meaning to the safety of maintaining the structure.
Currently, corrosion monitoring means commonly used in industry can be divided into two categories:
the first type is an environmental parameter-based monitoring technology, that is, a current corrosion state is evaluated by measuring an environmental parameter related to corrosion and combining an existing classical corrosion theory or a corrosion model, and the common technologies include: the corrosion rate monitoring method comprises the steps of conductivity monitoring, temperature monitoring, solution oxygen content monitoring, pH value monitoring, humidity monitoring, chloride ion concentration monitoring and the like, wherein the corrosion environment is complex and changeable, so that more environmental factors influencing the corrosion rate exist, the existing corrosion theoretical model is not perfect, the corrosion state cannot be evaluated through environmental parameters, and the corrosion rate cannot be calculated.
The second type is a monitoring technology based on a corrosion probe, that is, a corrosion probe made of the same material is placed around an object to be monitored, and the corrosion state of the probe is tested to estimate the corrosion state of the whole structure, and the common corrosion probe has the following forms: resistance probes, electrochemical three-electrode probes, weightless hanging pieces and the like. Since corrosion tends to have non-uniform characteristics, when localized corrosion occurs, there is a significant difference in the corrosion rates of different areas of the steel surface, and there is a distribution of cathodes and anodes on the surface, with the corrosion current between the cathodes and anodes further exacerbating the degree of localized corrosion. The conventional monitoring technology based on the corrosion probe can only measure the average corrosion information of one area, but cannot reflect the non-uniform degree of local corrosion.
The third type is a monitoring technology based on a multi-electrode system, namely, corrosion probes arranged in an array are arranged around a monitored object, and the corrosion state is judged by monitoring the potential information of each electrode and the current between each electrode. The method has the advantages of higher sensitivity, capability of obtaining the current corrosion rate and capability of identifying the corrosion type to a certain extent, but the technology relies on an external solution environment for providing electric communication, has the risk of failure in practical 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 technical means adopted by the invention are as follows:
a corrosion monitoring sensor for coupling four-probe potential drop measurement and tow electrode technology comprises a sensor outer shell, and a working electrode array, a temperature compensation electrode, a reference electrode, a test probe, a probe fixing plate, a lead and a PCB circuit board which are positioned in the sensor outer shell; epoxy resin pouring sealant is poured inside the sensor shell;
a pressure-resistant watertight connector used for connecting a multi-core shielding wire is fixedly arranged at the top of the sensor outer shell;
the working electrode array, the temperature compensation electrode and the reference electrode are all fixedly arranged on the bottom surface of the sensor outer 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 ceramics are 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-state reference electrode, and 1 test probe is connected to the reference electrode;
the top of the test probe is fixed on the probe fixing plate and is connected to the PCB circuit board through the lead, and the PCB circuit board is connected to the pressure-resistant watertight connector through the lead.
Further, the working electrode array is composed of m2The 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.
Further, the side length of the working surface of the working electrode is more than twice the thickness of the working electrode.
Furthermore, the temperature compensation electrode with 4 that the working electrode is connected test probe is the square and arranges, test probe with the temperature compensation electrode or the contact point of working electrode is located 4 summits of upper surface, wherein 2 of one side test probe is the current probe, 2 of the opposite side test probe is the voltage probe.
The invention also provides a corrosion monitoring device for coupling the four-probe potential drop measurement and the tow electrode technology, which comprises a corrosion monitoring sensor for coupling the four-probe potential drop measurement and the tow 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 multi-channel 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 voltage of the working electrode and the temperature compensation electrode so as to obtain the wall thickness loss of the working electrode according to the voltage;
the measuring end of the multi-channel digital voltmeter is connected with a working electrode array and a reference electrode in the corrosion monitoring sensor through the relay group B and is used for measuring the potential difference between the working electrode and the reference electrode;
and the measuring end of the multichannel zero-resistance galvanometer is connected with the working electrode array in the corrosion monitoring sensor through the relay group C and is used for measuring galvanic couple current between the working electrodes.
The invention also provides a monitoring method for coupling the four-probe potential drop measurement and the tow electrode technology, and the corrosion monitoring device adopting the four-probe potential drop measurement and the tow electrode technology 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 a four-probe technique: controlling the relay group A to be started, simultaneously controlling the multi-channel four-probe tester to sequentially test the voltages of the working electrodes and the temperature compensation electrodes, and recording test data;
s04: testing the electrode potential by applying a tow electrode technology: controlling the relay group B to be started, simultaneously controlling the multi-channel digital voltmeter to sequentially test the potential difference between each working electrode and the reference electrode, and recording test data;
s05: testing the current between the electrodes by using a tow electrode technology: controlling the relay group C to be started, controlling the multi-channel zero-resistance galvanometer to test the galvanic 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 multi-channel four-probe tester, and drawing a cloud chart; drawing a potential cloud chart based on the measurement result of the multi-channel digital voltmeter; and drawing a current cloud picture based on a galvanic couple current test result of the multi-channel zero-resistance current meter.
Further, in step S06, a calculation formula for calculating the wall thickness loss Δ δ of each working electrode according to the electrode voltage result measured by the multi-channel four-probe tester is as follows:
wherein, UmRepresents an initial voltage of the working electrode,
represents the voltage after corrosion of the working electrode,/mRepresents the spacing, δ, of adjacent test probes on the working electrodemDenotes the initial thickness, U, of the working electrodecRepresents the initial voltage of the temperature compensation electrode,
representing the voltage after the corrosion of the temperature compensation electrode, X representing the initial state voltage ratio, X*The voltage ratio after etching 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 tow electrode technology can synchronously monitor the local corrosion depth and the current and potential distribution of the anode and the cathode on line, and can realize the discrimination and monitoring of the on-line electrochemical corrosion damage and the non-electrochemical corrosion damage and the on-line discrimination of the corrosion component of the macro battery and the corrosion component of the micro battery.
Based on the reason, the invention can be widely popularized in the field of monitoring local corrosion damage of metal materials.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a corrosion monitoring sensor according to the present invention.
Fig. 2 is a schematic view of the mounting position of the test probe in which the working electrode and the temperature compensation electrode are connected according to the present invention.
FIG. 3 is a schematic structural view of a corrosion monitoring device coupled with a four-probe potential drop measurement and tow electrode technique according to the present invention.
FIG. 4 is a schematic diagram of the working principle of the corrosion monitoring device coupled with the four-probe potential drop measurement and tow electrode technology.
FIG. 5 is a timing diagram of a monitoring method of the coupled four probe potential drop measurement and tow electrode technique of the present invention.
FIG. 6 is a flow chart of a corrosion monitoring method of the coupled four probe potential drop measurement and tow electrode technique of the present invention.
In the figure: 1. an array of working electrodes; 2. a temperature compensation electrode; 3. a reference electrode; 4. testing the probe; 5. a probe fixing plate; 6. a wire; 7. a PCB circuit board; 8. a sensor outer housing; 9. epoxy sealant; 10. a pressure-resistant watertight connector; 11. a voltage probe; 12. and a current probe.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present 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 invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the 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. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship 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 of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
Example 1
As shown in fig. 1, the invention provides a corrosion monitoring sensor coupling a four-probe potential drop measurement and a tow electrode technology, which comprises a sensor outer shell 8, and a working electrode array 1, a temperature compensation electrode 2, a reference electrode 3, a test probe 4, a probe fixing plate 5, a lead 6 and a PCB circuit board 7 which are positioned inside the sensor outer shell 8; the sensor shell 8 is internally filled with epoxy resin pouring sealant 9 and is not contacted with the external corrosive environment; the corrosion monitoring sensor disclosed by the invention is in contact with a corrosion environment through the bottom surface of the sensor outer shell 8, and all other components are placed in the sensor outer shell 8;
a pressure-resistant watertight connector 10 for connecting a multi-core shielding wire is fixedly arranged at the top of the sensor outer shell 8;
the working electrode array 1, the temperature compensation electrode 2 and the reference electrode 3 are all fixedly arranged on the bottom surface of the sensor outer 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 chromium oxide ceramics are sprayed on the lower surface of the temperature compensation electrode 2 to prevent the chromium oxide ceramics from directly contacting 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 the reference electrode 3 is connected with 1 test probe 4;
the top of the test probe 4 is fixed on the probe fixing plate 5 and is connected to the PCB circuit board 7 through the lead 6, and the PCB circuit board 7 is connected to the pressure-resistant watertight connector 10 through the lead 6.
Further, the working electrode array 1 is composed of m2The 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.
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.
Furthermore, 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 actual measurement requirements, and in order to achieve better measurement accuracy, the side length of the working surface of the working electrode is more than twice of the thickness of the working electrode; in addition, the distance between two adjacent electrodes is reduced as much as possible while ensuring the insulation between the electrodes.
Further, the temperature compensation electrode 2 with 4 that the working electrode is connected test probe is the square and arranges, test probe 4 with the temperature compensation electrode 2 or the contact point of working electrode is located 4 summits of upper surface, wherein 2 of one side test probe 4 is current probe 12 for exert constant current, 2 of the other side test probe 4 is voltage probe 11 for test 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 structure to be monitored, 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 tow electrode technology, which comprises a corrosion monitoring sensor for coupling the four-probe potential drop measurement and the tow 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 multi-channel 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 voltage of the working electrode and the temperature compensation electrode so as to obtain the wall thickness loss of the working electrode according to the voltage;
the measuring end of the multi-channel digital voltmeter is connected with a working electrode array and a reference electrode in the corrosion monitoring sensor through the relay group B and is used for measuring the potential difference between the working electrode and the reference electrode;
and the measuring end of the multichannel zero-resistance galvanometer is connected with the working electrode array in the corrosion monitoring sensor through the relay group C and is used for measuring galvanic couple current between the working electrodes.
Furthermore, the corrosion monitoring device for coupling the four-probe potential drop measurement and the tow 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 signal control relay group A relay group B with relay group C, the computer can gather the four probe tester of multichannel the multichannel digital voltmeter with the measuring signal that multichannel zero resistance ammeter sent to with the graphical display measuring result.
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 measuring terminals, wherein one measuring terminal is connected with the working electrode, and the other measuring terminal is connected with the reference electrode.
Further, each channel of the multi-channel zero-resistance galvanometer is provided with a measuring terminal used for connecting the working electrode.
The invention also provides a monitoring method for coupling the four-probe potential drop measurement and the tow electrode technology, which is characterized in that the corrosion monitoring device for coupling the four-probe potential drop measurement and the tow electrode technology is adopted, and the method 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: and (3) testing the electrode voltage by using a four-probe technology, and further obtaining the wall thickness loss (corrosion depth) of the working electrode: the computer sends an instruction to control the relay group A to be started, and simultaneously controls the multichannel four-probe tester to test the voltages of the working electrodes and the temperature compensation electrodes in sequence and record test data;
s04: testing the electrode potential by applying a tow electrode technology: the computer sends an instruction to control the relay group B to be started, and simultaneously controls the multi-channel digital voltmeter to sequentially test the potential difference between each working electrode and the reference electrode and record test data;
s05: testing the current between the electrodes by using a tow electrode technology: the computer sends an instruction to control the relay group C to be started, control the multichannel zero-resistance galvanometer to test the galvanic couple current between the working electrodes and record test data;
s06: data processing and analysis: calculating the wall thickness loss of each working electrode based on the voltage result measured by the multi-channel four-probe tester, and drawing a cloud chart; drawing a potential cloud chart based on the measurement result of the multi-channel digital voltmeter; and drawing a current cloud picture based on a galvanic couple current test result of the multi-channel zero-resistance current meter.
Further, in step S06, a calculation formula for calculating the wall thickness loss Δ δ of each working electrode according to the electrode voltage result measured by the multi-channel four-probe tester is as follows:
wherein, UmRepresents an initial voltage of the working electrode,
represents the voltage after corrosion of the working electrode,/mRepresents the spacing, δ, of adjacent test probes on the working electrodemDenotes the initial thickness, U, of the working electrodecRepresents the initial voltage of the temperature compensation electrode,
representing the voltage after the corrosion of the temperature compensation electrode, X representing the initial state voltage ratio, X*The voltage ratio after etching is shown.
In the invention, the voltage calculation formula for testing the working electrode and the temperature compensation electrode by using the multi-channel four-probe tester and the four-probe technology is as follows:
wherein, KmRepresenting the edge modification factor of the working electrode,/cRepresenting the spacing, δ, of adjacent test probes on said temperature-compensated electrodecRepresents the thickness, K, of the temperature compensation electrodecRepresenting an edge modification factor of the working electrode, I representing an input current of the multi-channel four-probe tester, and σ representing conductivity；
The voltage ratio X is calculated as:
after the surface of the working electrode is corroded, the thickness is reduced to deltamΔ δ, where X is the voltage ratio*The relationship to the thickness loss Δ δ is:
comparing the initial state voltage ratio X with the post-corrosion voltage ratio X*By doing the ratio, the above-mentioned calculation formula of the wall thickness loss Δ δ can be obtained, and δ of the working electrode is knownmAnd lmThe wall thickness loss Δ δ 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 tow electrode technology can synchronously monitor the local corrosion depth and the current and potential distribution of the anode and the cathode on line, and can realize the discrimination and monitoring of the on-line electrochemical corrosion damage and the non-electrochemical corrosion damage and the on-line discrimination of the corrosion component of the macro battery and the corrosion component of the micro battery.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A corrosion monitoring sensor for coupling four-probe potential drop measurement and a tow electrode technology is characterized by comprising a sensor outer shell, and a working electrode array, a temperature compensation electrode, a reference electrode, a test probe, a probe fixing plate, a lead and a PCB circuit board which are positioned in the sensor outer shell; epoxy resin pouring sealant is poured inside the sensor shell;
a pressure-resistant watertight connector used for connecting a multi-core shielding wire is fixedly arranged at the top of the sensor outer shell;
the working electrode array, the temperature compensation electrode and the reference electrode are all fixedly arranged on the bottom surface of the sensor outer 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 ceramics are 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-state reference electrode, and 1 test probe is connected to the reference electrode;
the top of the test probe is fixed on the probe fixing plate and is connected to the PCB circuit board through the lead, and the PCB circuit board is connected to the pressure-resistant watertight connector through the lead.
2. The corrosion monitoring sensor of claim 1, wherein said working electrode array is defined by m2The 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.
3. The corrosion monitoring sensor of coupled four probe potential drop measurement and tow electrode technology of claim 2, wherein the side length of the working electrode working face is greater than twice the working electrode thickness.
4. The sensor of claim 1, wherein 4 of said test probes connected to said temperature compensation electrode and said working electrode are arranged in a square configuration, and contact points of said test probes with said temperature compensation electrode or said working electrode are located at 4 vertices of the upper surface, wherein 2 of said test probes on one side are current probes and 2 of said test probes on the other side are voltage probes.
5. A corrosion monitoring device for coupling four-probe potential drop measurement and a tow electrode technology 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 tow electrode technology;
the measuring end of the multi-channel 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 voltage of the working electrode and the temperature compensation electrode so as to obtain the wall thickness loss of the working electrode according to the voltage;
the measuring end of the multi-channel digital voltmeter is connected with a working electrode array and a reference electrode in the corrosion monitoring sensor through the relay group B and is used for measuring the potential difference between the working electrode and the reference electrode;
and the measuring end of the multichannel zero-resistance galvanometer is connected with the working electrode array in the corrosion monitoring sensor through the relay group C and is used for measuring galvanic couple current between the working electrodes.
6. A monitoring method for coupling four-probe potential drop measurement and a tow electrode technology is characterized in that the corrosion monitoring device for coupling four-probe potential drop measurement and the tow electrode technology is adopted, and the monitoring method 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 a four-probe technique: controlling the relay group A to be started, simultaneously controlling the multi-channel four-probe tester to sequentially test the voltages of the working electrodes and the temperature compensation electrodes, and recording test data;
s04: testing the electrode potential by applying a tow electrode technology: controlling the relay group B to be started, simultaneously controlling the multi-channel digital voltmeter to sequentially test the potential difference between each working electrode and the reference electrode, and recording test data;
s05: testing the current between the electrodes by using a tow electrode technology: controlling the relay group C to be started, controlling the multi-channel zero-resistance galvanometer to test the galvanic 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 multi-channel four-probe tester, and drawing a cloud chart; drawing a potential cloud chart based on the measurement result of the multi-channel digital voltmeter; and drawing a current cloud picture based on a galvanic couple current test result of the multi-channel zero-resistance current meter.
7. The method for monitoring coupled four-probe potential drop measurement and tow electrode technology of claim 6, wherein in step S06, the calculation formula for calculating the wall thickness loss Δ δ of each working electrode according to the electrode voltage result measured by the multi-channel four-probe tester is as follows:
wherein, UmIndicating the operating electricityThe voltage is set at an extremely initial voltage,
represents the voltage after corrosion of the working electrode,/mRepresents the spacing, δ, of adjacent test probes on the working electrodemDenotes the initial thickness, U, of the working electrodecRepresents the initial voltage of the temperature compensation electrode,
representing the voltage after the corrosion of the temperature compensation electrode, X representing the initial state voltage ratio, X*The voltage ratio after etching is shown.
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