CN111879695A - Real-time monitoring method for coating failure and corrosion monitoring sensor - Google Patents
Real-time monitoring method for coating failure and corrosion monitoring sensor Download PDFInfo
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Abstract
The invention provides a real-time monitoring method for coating failure and a corrosion monitoring sensor, relates to the technical field of metal corrosion protection, and can monitor the corrosion degree of a coating on the surface of a sensor by arranging the coating on the corrosion monitoring sensor and placing the coating in a service environment; the method comprises the steps of S1, preprocessing a corrosion monitoring sensor; s2, preparing a coating to be monitored on the surface of the pretreated corrosion monitoring sensor; s3, placing the corrosion monitoring sensor with the coating prepared on the surface in a service environment, electrically connecting the corrosion monitoring sensor with micro-current acquisition equipment, and representing the failure state of the coating through current data acquired by the micro-current acquisition equipment. The technical scheme provided by the invention is suitable for the process of monitoring the failure of the coating in different service environments.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of metal corrosion protection, in particular to a real-time monitoring method for coating failure and a corrosion monitoring sensor.
[ background of the invention ]
In order to reduce the corrosion caused by metal materials, many engineering projects adopt a coating protection method to improve the corrosion resistance of metals. But the coating can suffer from the problems of external force damage, ultraviolet radiation, salt spray erosion, alternation of wetting and drying and the like, so that the protective performance to metal is lost, and the problem of aging failure of the coating is caused. However, local damage of the coating is difficult to observe by naked eyes, so that the failure phenomenon of the coating is gradually aggravated, and certain potential safety hazard exists. Therefore, the method has important significance for monitoring the failure of the coating and predicting and diagnosing the protective performance of the coating in advance.
In addition, the corrosion monitoring probe adopted in CN108827868A includes a probe cavity, a probe inner core, a bottom plate at the lower end of the probe cavity, an external guide wire, etc., wherein the probe inner core is composed of a working electrode, a reference electrode, and an auxiliary electrode, and the working electrode, the auxiliary electrode, and the reference electrode are all disposed on the bottom plate. The monitoring method is that the three-electrode monitoring probe is connected with an impedance tester, and the impedance modulus value and the phase angle at a certain moment are calculated and measured. The mode value and the phase angle of the impedance obtained by the electrochemical impedance test effectively evaluate the protective performance and the aging failure degree of the coating. However, the impedance test technology can only reflect the protective performance of the coating at a certain moment, and cannot monitor the process of the change of the protective performance of the coating in real time.
Accordingly, there is a need to develop a real-time monitoring method of coating failure to address the deficiencies of the prior art to address or mitigate one or more of the problems set forth above.
[ summary of the invention ]
In view of the above, the invention provides a real-time monitoring method for coating failure and a corrosion monitoring sensor, which can monitor the corrosion degree of a coating on the surface of the sensor by arranging the coating on the corrosion monitoring sensor and placing the coating in a service environment, can monitor the failure condition of the coating under various service working conditions in real time, and have the advantages of convenient operation and wide application range.
In one aspect, the present invention provides a real-time monitoring method for coating failure, which is characterized in that the real-time monitoring method comprises the following steps:
s1, preprocessing the corrosion monitoring sensor;
s2, preparing a coating to be monitored on the surface of the pretreated corrosion monitoring sensor;
s3, placing the corrosion monitoring sensor with the coating prepared on the surface in a service environment, electrically connecting the corrosion monitoring sensor with monitoring equipment, and representing the failure state of the coating through data acquired by the monitoring equipment.
The above aspect and any possible implementation further provides an implementation in which the coating has a thickness of 60 μm to 100 μm.
The above aspects and any possible implementations further provide an implementation that the coating is prepared and dried in an environment at 50-78 ℃ for 20-24 h.
The above-described aspects and any possible implementations further provide an implementation where the pre-processing includes adjusting a surface roughness of the corrosion monitoring sensor and cleaning the corrosion monitoring sensor.
The above-described aspects and any possible implementations further provide an implementation in which the corrosion monitoring sensor has a surface roughness of Ra 0.1a-0.2 a; the surface roughness can be adjusted by adopting a polishing mode;
the process of cleaning the corrosion monitoring sensor comprises: cleaning the corrosion monitoring sensor by using ethanol, and drying for 2-5 h under the drying condition of 55-70 ℃.
The above aspect and any possible implementation manner further provide an implementation manner, when the monitoring device is a micro-current monitoring device, an initial current value of the corrosion monitoring sensor connected with the monitoring device in an atmospheric environment is 0nA to 0.5 nA.
In another aspect, the present invention provides a corrosion monitoring sensor, wherein the corrosion monitoring sensor is used for implementing the real-time monitoring method for coating failure as described above;
the corrosion monitoring sensor comprises a probe and a cavity, and the probe is arranged in the cavity; the cavity comprises at least one anode part, at least one cathode part and at least one insulating part, the anode parts and the cathode parts are alternately distributed, and the insulating part is arranged between the adjacent anode parts and the adjacent cathode parts; the anode part and the cathode part are respectively connected with the positive and negative input ends of the monitoring equipment through guide wires.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner in which two or more of the anode portions are connected in series and then connected to a monitoring device through a guide line; more than two cathode parts are connected in series and then connected with monitoring equipment through a guide wire.
The above aspect and any possible implementation manner further provide an implementation manner, wherein the corrosion monitoring sensor further comprises a fixing seat of a tubular structure, and the anode portion and the cathode portion are fixed in the fixing seat through insulating fillers.
The above aspect and any possible implementation further provides an implementation, in which the filler is an epoxy resin; the anode part is made of Q235 steel, and the cathode part is made of graphite.
The above aspect and any possible implementation further provide an implementation in which the anode portion, the cathode portion, and the insulating portion are all sheet-like structures.
Compared with the prior art, the invention can obtain the following technical effects: the coating is arranged on the corrosion monitoring sensor and placed in a service environment to monitor the corrosion degree of the coating on the surface of the sensor, so that the failure condition of the coating under the service working conditions of atmospheric environment, seawater environment, salt mist environment, alternate dry and wet environment and the like can be monitored, the operation is convenient, and the application range is wide.
Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a coating failure monitoring method provided by one embodiment of the present invention;
FIG. 2 is a graph of the trend of current monitored over time in a soak environment for an epoxy coating provided by one embodiment of the present invention;
FIG. 3 is a graph of the trend of monitored current over time in a wet-dry alternating environment for a polyurethane coating provided by an embodiment of the present invention;
FIG. 4 is a graph of the trend of monitored current over time in a soaking environment for a corrosion inhibitor-added epoxy coating and a corrosion inhibitor-free epoxy coating provided by an embodiment of the invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The invention provides a method for monitoring the protective performance of a coating in real time through a corrosion monitoring sensor and a micro-current meter. A corrosion monitoring sensor is adopted, a coating to be monitored is prepared on the corrosion monitoring sensor, the corrosion monitoring sensor is placed in an environment needing to be monitored, and the monitoring sensor is electrically connected with a micro-current meter to realize monitoring. The method can monitor the failure aging states of different coatings in various service environments in real time, and has the advantages of high sensitivity, high accuracy, flexible operation and wide application range.
A method for monitoring the failure performance of a coating in real time under different service environments comprises the following steps:
(1) the galvanic corrosion monitoring sensor is adopted, and can be placed in a service environment to monitor the corrosion degree of a material on the surface of the sensor;
(2) the surface of the corrosion monitoring sensor is pretreated, the surface of the corrosion monitoring sensor is coated with a coating to be detected, the corrosion monitoring sensor is electrically connected with a micro-current meter, the galvanic corrosion current on the surface of the sensor in an actual corrosion environment is monitored through the micro-current meter, the shielding performance of the coating to be monitored is further reflected, namely the change of the metal protection performance on the surface of the sensor is judged in real time, and the failure degree of the coating is judged. Monitoring the thickness of the coating prepared on the surface of the sensor to be 60-100 mu m, and drying the coating, wherein the temperature of an oven is 50-78 ℃ when the coating is dried, and the drying time is 20-24 h. The coating is suitable for various coatings commonly used on metal surfaces, such as epoxy coatings, polyurethane coatings, epoxy coatings with or without corrosion inhibitors, and the like.
Before a coating is prepared on the surface of the sensor, the surface roughness range of the corrosion monitoring sensor needs to reach Ra 0.1a-0.2a, and the sensor is cleaned by ethanol. After the surface of the corrosion monitoring sensor is cleaned, the sensor is placed in an oven for drying at 55-70 ℃ for 2-5 h. After the corrosion monitoring sensor is cleaned and dried, the initial current value of the corrosion monitoring sensor connected with the micro-current meter under the atmospheric environment is 0nA-0.5 nA. The micro-current meter is used for real-time characterization of corrosion condition of the surface of the monitoring sensor and protection degree of the coating. The current range of the micro-current meter is 0nA-50mA, the measurement precision is 1nA, and the measurement time interval is 1min-2 min.
The corrosion monitoring sensor comprises a probe, a cavity and an outer guide wire, wherein the probe is arranged in the cavity. Wherein the cavity comprises at least one anode material, at least one cathode material and at least one insulating spacer, wherein: the anode material, the cathode material and the insulating spacers are all of a sheet structure, at least one anode material and at least one cathode material are alternately arranged, and each insulating spacer is placed between the adjacent anode material and cathode material; the end of the guide wire connected in series with the at least one anode material is an anode lead end, and the end of the guide wire connected in series with the at least one cathode material is a cathode lead end. The corrosion monitoring sensor also comprises a fixed seat, and the anode material and the cathode material are fixed in the fixed seat. The fixing seat has a tubular structure, and the anode material and the cathode material are fixed in the fixing seat through fillers.
The filler is epoxy resin. The anode material is Q235 steel, and the cathode material is graphite.
Electrically connecting an anode lead end and a cathode lead end of the corrosion monitoring sensor with a micro-current meter; after the adjacent anode material and cathode material are subjected to galvanic corrosion, a closed loop is formed between the corrosion monitoring sensor and the micro-current meter to generate current.
The micro-current meter may have a display screen for displaying the current value. Further, the micro-current meter may integrate a processor and a memory for storing process current data.
In order to verify the monitoring of the micro-current meter on the protective performance of the coating, the corrosion monitoring sensor can be electrically connected with the impedance tester for verification. The anode lead end is used as a working electrode, the cathode lead end is used as an auxiliary electrode and a reference electrode, and the anode lead end and the cathode lead end are connected with an alternating current impedance tester to measure impedance modulus data at a certain time and verify the change of current readings.
Example 1:
this embodiment employs a coating failure monitoring sensor for monitoring the corrosion protection properties of the coating on the surface of the sensor.
The present embodiment selects an epoxy coating as the coating to be detected.
The working surface of the probe was first sanded with 150#, 400# sandpaper, and then the sensor surface was washed with ethanol and dried, and the sensor was placed on a flat glass plate. And (3) coating the prepared epoxy coating on the flat sensor surface by a scraper bar, putting the sensor coated with the epoxy coating into a drying oven, and drying for 24 hours. The coating thickness was controlled to 80 μm. The sensor protected by the complete coating is placed in 3.5 wt.% of NaCl solution, an anode lead section and a cathode lead section of the sensor are connected with a micro-current meter for displaying the current value, a loop is formed by the micro-current meter and an inner core of the sensor, and the protective performance of the coating on an anode metal piece on the surface of the sensor is monitored in real time.
It should be further noted that, as shown in fig. 2, in the initial stage of the soaking, the complete epoxy coating greatly blocks oxygen, ions, etc. from contacting the sensor surface, the anode metal piece and the cathode metal piece do not form an electrical circuit, and the current value monitored by the micro-current meter is 0nA, which indicates that the protective performance of the coating is good. As the soaking time is extended, the electrolyte solution and oxygen gradually permeate through the micro-porous gaps of the coating to the coating/substrate interface, i.e., the surface of the sensor. At this time, an electrolyte liquid film is formed on the surface of the sensor, galvanic corrosion occurs between the adjacent Q235 steel and graphite, and a closed loop is formed between the corrosion sensor and the micro-current meter, a current is generated, the micro-current meter monitors that the current is about 140nA, and as the electrolyte solution continuously permeates through the coating, the galvanic corrosion area increases, and the current rises to about 280nA again. Therefore, the coating corrosion monitoring sensor can reflect the protective performance of the coating with high precision and monitor the failure process of the coating in real time.
Example 2:
in this embodiment, a polyurethane coating is selected as the coating to be detected.
The sensor was placed on a flat glass plate by first sanding the working surface of the sensor with 150#, 400# sandpaper, then washing and drying the sensor surface with ethanol. And (3) coating the prepared polyurethane coating on the flat sensor surface by a scraper, putting the sensor coated with the polyurethane coating into a drying oven, and drying for 24 hours. The coating thickness was controlled to 80 μm. After drying, a nicking tool is adopted to artificially process a linear scratch on the surface of the polyurethane coating, and the length of the scratch is about 100 mu m. The scored polyurethane coated sensor was placed in a device that allowed for alternate dry and wet experiments. Wherein the solution environment is 3.5 wt.% NaCl solution, and the drying environment is 298K, RH 50%, wherein the soaking is performed for 40min, the drying is performed for 20min, and the alternation period is 1 h. The anode lead wire segment and the cathode lead wire segment of the sensor are connected with a micro-current meter for displaying the current value, a loop is formed by the micro-current meter and an inner core of the sensor, and the protective performance of the coating on the surface material of the sensor is monitored in real time.
It is further noted that the corrosion monitoring sensor is in a periodic immersion and dry environment, and the alternating dry and wet environment causes the polyurethane coating to periodically change the protective performance of the corrosion monitoring sensor. As shown in fig. 3, in the immersion process, since the corrosion monitoring sensor is in a solution environment, the electrolyte solution rapidly permeates into the interface of the coating substrate through the micropore gaps and the damaged parts of the coating, an electrolyte membrane is formed on the surface of the sensor, galvanic corrosion occurs between the adjacent Q235 steel and graphite, and a closed loop is formed between the corrosion sensor and the micro-current meter to generate current. Along with the gradual stabilization of the corrosion monitoring sensor in a solution environment, the oxygen diffusion is blocked, the galvanic corrosion on the surface of the sensor is influenced by the oxygen concentration, the corrosion is gradually slowed down, and the current reading is reduced. When the sensor is dried after the sensor finishes the immersion period, the galvanic corrosion is still carried out because the electrolyte liquid film still exists on the surface of the sensor, and meanwhile, the galvanic corrosion is slightly intensified under the condition of sufficient oxygen along with the increase of the oxygen concentration in the drying process, and the current display is slightly increased. And (4) along with the end of the drying period, the corrosion monitoring probe is immersed again, the corrosion is aggravated again, the current is rapidly increased again, and the period is repeated. Polyurethane coatings are susceptible to failure under the alternating action of moisture and moisture, and the resulting pore defects promote electrolyte permeation within the coating. Therefore, the coating corrosion monitoring sensor can sensitively reflect the protective performance of the coating in an environment with alternate dry and wet periods, and simultaneously monitor the failure process of the coating in real time.
Example 3:
in this embodiment, an epoxy coating with a corrosion inhibitor and an epoxy coating without a corrosion inhibitor are selected as the coatings to be detected, and comparison is performed.
The sensor was placed on a flat glass plate by first sanding the working surface of the sensor with 150#, 400# sandpaper, then washing and drying the sensor surface with ethanol. Firstly, preparing epoxy paint added with 5 percent phosphoric acid corrosion inhibitor and epoxy paint without corrosion inhibitor, adopting a scraper bar to scrape the prepared epoxy coating on the surface of a flat sensor, putting the sensor which is brushed well into a drying oven, and drying for 24 hours. The coating thickness was controlled to 80 μm. After drying, a nicking tool is adopted to artificially process the linear scratches with the same size on the surfaces of the coatings with the corrosion inhibitor and without the corrosion inhibitor. The sensor protected by the damaged coating is placed in 3.5 wt.% of NaCl solution, an anode lead section and a cathode lead section of the sensor are connected with a micro-current meter for displaying the current value, a loop is formed by the micro-current meter and an inner core of the sensor, the current change is monitored in real time, and the protective performance of the coating added with the corrosion inhibitor and the coating not added with the corrosion inhibitor on the anode metal piece on the surface of the sensor is observed.
To further illustrate the monitoring of the protective properties of the coating by the galvanometer in this example, the coating monitoring sensor was electrically connected to an ac impedance tester for verification. The specific implementation is as follows: the anode metal Q235 lead end of the coating monitoring sensor is used as a working electrode, the cathode graphite lead section is used as an auxiliary electrode and a reference electrode, and the anode metal Q235 lead end is connected with an alternating current impedance tester, wherein the electrochemical impedance measurement frequency range is as follows: 105-10-2Hz, the amplitude of the sine wave excitation signal is 10 mV. And (3) selecting a certain time to measure the impedance modulus value and the phase angle of the coating at the moment, further explaining the change of the protective performance of the coating through electrochemical impedance data, and verifying and explaining the reliability and the sensitivity of the coating monitoring sensor.
It should be further noted that, as shown in fig. 4, in the initial stage of soaking, due to the artificial damage on the coating surface, the electrolyte solution is easy to permeate to the sensor surface, and the anode metal piece and the cathode metal piece form an electric circuit to generate galvanic couple current, where the current readings are all about 300 nA. Along with the prolonging of the soaking time, the corrosion of the epoxy coating without the corrosion inhibitor is gradually intensified, the electrolyte solution is transversely diffused through an artificial damaged area, and simultaneously, the galvanic corrosion area is increased through the longitudinal permeation of cracks and micropores of the coating, the current indication shows a gradually rising trend, and the current indication reaches 650nA after the coating is soaked for 24 hours. Epoxy coating with corrosion inhibitorThe electrolyte solution permeates into the coating, the corrosion inhibitor is gradually released, the released phosphoric acid substances react with the anode metal steel substrate to generate insoluble phosphate which is deposited at a corrosion position to seal a corrosion area to form an isolation layer, the corrosion of the surface of the sensor is slowed down, the current indication is slightly reduced, the whole stable state is maintained, the current reaches 210nA when the sensor is soaked for 24 hours, and the current of the epoxy coating added with the corrosion inhibitor improves the protective performance of the coating to a certain extent. The combined impedance can be found that the impedance values of the epoxy coating with the corrosion inhibitor and the coating without the corrosion inhibitor after the epoxy coating and the coating without the corrosion inhibitor are stabilized in the solution at the initial stage of soaking are respectively 4.38 multiplied by 105Ω·cm2And 8.25X 105Ω·cm2After soaking for 24h, the impedance modulus values of the two are 1.45 multiplied by 10 respectively5Ω·cm2And 1.20X 106Ω·cm2. The resistance modulus value of the epoxy coating added with the corrosion inhibitor is slightly increased or maintained unchanged in the soaking process, but the resistance value of the epoxy coating not added with the corrosion inhibitor is obviously reduced due to continuous penetration of a corrosion medium, and the monitoring result is consistent with that of the invention. Therefore, the coating corrosion monitoring sensor can sensitively reflect the change of the protective performance of different coatings, and realizes the real-time monitoring of the protective performance of the coatings.
The invention has the following beneficial effects:
(1) according to the coating corrosion monitoring method, the failure condition of the coating under service working conditions such as an atmospheric environment, a seawater environment, a salt spray environment, a dry-wet alternate environment and the like can be monitored by applying the corrosion monitoring sensor, the operation is convenient, and the application range is wide;
(2) the application provides a coating corrosion monitoring method, can real-time supervision coating protective properties through connecting little current meter, the ageing failure degree of evaluation coating, convenient operation, sensitivity is high.
The method for monitoring the failure of the coating in real time provided by the embodiment of the application is described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. A method for real-time monitoring of coating failure, the steps of the real-time monitoring method comprising:
s1, preprocessing the corrosion monitoring sensor;
s2, preparing a coating to be monitored on the surface of the pretreated corrosion monitoring sensor;
s3, placing the corrosion monitoring sensor with the coating prepared on the surface in a service environment, electrically connecting the corrosion monitoring sensor with monitoring equipment, and representing the failure state of the coating through data acquired by the monitoring equipment.
2. The method of claim 1, wherein the coating has a thickness of 60 μ ι η to 100 μ ι η.
3. The method for real-time monitoring of coating failure as claimed in claim 2, wherein the coating is prepared and dried in an environment of 50-78 ℃ for 20-24 h.
4. The method of real-time monitoring of coating failure of claim 1, wherein the pre-treatment comprises adjusting a surface roughness of the corrosion monitoring sensor and cleaning the corrosion monitoring sensor.
5. The method of claim 4, wherein the corrosion monitoring sensor has a surface roughness of Ra 0.1a-0.2 a;
the process of cleaning the corrosion monitoring sensor comprises: cleaning the corrosion monitoring sensor by using ethanol, and drying for 2-5 h under the drying condition of 55-70 ℃.
6. The method for monitoring the failure of the coating in real time according to claim 1, wherein when the monitoring device is a micro-current monitoring device, the initial current value of the corrosion monitoring sensor connected with the monitoring device in an atmospheric environment is 0nA-0.5 nA.
7. A corrosion monitoring sensor for performing a method of real-time monitoring of coating failure according to any of claims 1-6;
the corrosion monitoring sensor comprises a probe and a cavity, and the probe is arranged in the cavity; the cavity comprises at least one anode part, at least one cathode part and at least one insulating part, the anode parts and the cathode parts are alternately distributed, and the insulating part is arranged between the adjacent anode parts and the adjacent cathode parts; the anode part and the cathode part are respectively connected with the positive and negative input ends of the monitoring equipment through guide wires.
8. The corrosion monitoring sensor of claim 7, wherein two or more of said anode portions are connected in series and connected to a monitoring device by a lead wire; more than two cathode parts are connected in series and then connected with monitoring equipment through a guide wire.
9. The corrosion monitoring sensor of claim 7 further comprising a tubular-structured holder, the anode portion and the cathode portion each being secured in the holder by an insulating filler.
10. The corrosion monitoring sensor of claim 9 wherein the filler is an epoxy; the anode part is made of Q235 steel, and the cathode part is made of graphite.
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CN115074819A (en) * | 2021-03-11 | 2022-09-20 | 隆基绿能科技股份有限公司 | Thermal field component repair judgment method, processing method, device and system |
CN115629033A (en) * | 2022-10-21 | 2023-01-20 | 中国电力工程顾问集团西南电力设计院有限公司 | Corrosion prevention monitoring system and corrosion prevention monitoring method for cooling tower |
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