CN112881479B - Coating monitoring device and monitoring method - Google Patents
Coating monitoring device and monitoring method Download PDFInfo
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- CN112881479B CN112881479B CN202110025504.9A CN202110025504A CN112881479B CN 112881479 B CN112881479 B CN 112881479B CN 202110025504 A CN202110025504 A CN 202110025504A CN 112881479 B CN112881479 B CN 112881479B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/20—Investigating the presence of flaws
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/004—Investigating resistance of materials to the weather, to corrosion, or to light to light
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/045—Circuits
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/226—Construction of measuring vessels; Electrodes therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/228—Circuits therefor
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/24—Investigating the presence of flaws
Abstract
The invention relates to the technical field of engineering materials, and provides a coating monitoring device and a monitoring method, wherein the coating monitoring device comprises: the device comprises a coating impedance sensing module, a coating impedance acquisition module and a coating impedance measurement module; the coating impedance sensing module is arranged on the surface of the coating and is used for sensing the change of the coating resistance and/or the coating capacitance; the coating impedance acquisition module and the coating impedance sensing module are connected to form a resonance circuit, and the resonance circuit is used for acquiring resonance frequency change in the resonance circuit caused by the change of coating resistance and/or coating capacitance; the coating impedance measuring module is connected with the coating impedance collecting module and used for calculating the aging result of the coating according to the change of the resonant frequency. The invention provides a coating monitoring device and a coating monitoring method, wherein a resonant circuit is formed by arranging a sensing module and an acquisition module connected with the sensing module, so that the resonant frequency change caused by the resistance and/or capacitance change of a coating is acquired, and the aging degree of the coating is monitored.
Description
Technical Field
The invention relates to the technical field of engineering materials, in particular to a coating monitoring device and a coating monitoring method.
Background
The body or the bottom beam coating of the rail vehicle is usually made of aluminum alloy materials, the aluminum alloy has excellent mechanical properties, is easy to process, has high durability and light weight, and is widely applied to high-speed rail vehicles and aerospace industry. In the long-term use process of the aluminum alloy material, pitting corrosion, denudation, crevice corrosion and the like may occur, and for a high-speed railway vehicle, local corrosion on a bottom beam of the railway vehicle may cause stress corrosion cracking, so that local stress concentration of material corrosion is caused, and material fatigue fracture is caused. Organic coatings are the most common means of metal protection, and the coatings have reduced protection performance during service due to ultraviolet radiation, salt spray erosion, high and low temperature, and alternate dry and wet climate change and abrasion. In the failure process of the coating, aqueous solution penetrates through the coating and enters the coating/substrate interface to cause corrosion of a metal substrate, for some functional coatings, the coating fails and cannot be seen by naked eyes but loses the function, and the occurrence of corrosion causes potential safety hazards such as substrate corrosion. Therefore, the aging state of the coating must be monitored by timely diagnosing the substrate before obvious corrosion occurs, and the overall protective performance of the coating is pre-judged in advance, which has important significance for the preventive maintenance of the coating and the prolonging of the service life of equipment.
Disclosure of Invention
The invention provides a coating monitoring device, which is used for solving the problem that in the failure process of a coating, an aqueous solution penetrates through the coating and enters a coating/substrate interface to cause corrosion of a metal substrate, for some functional coatings, the coating cannot be seen by naked eyes but loses the function, and the occurrence of corrosion causes potential safety hazards such as substrate corrosion.
The invention also provides a monitoring method of the coating monitoring device, which is used for solving the problem that in the failure process of the coating, aqueous solution penetrates through the coating and enters the coating/substrate interface to cause corrosion of a metal substrate, for some functional coatings, the coating fails and is invisible to naked eyes but loses the function, the occurrence of corrosion causes potential safety hazards such as substrate corrosion and the like, and the aging degree of the coating is monitored by collecting the change of resonance frequency caused by the change of resistance and/or capacitance of the coating.
According to a first aspect of the present invention there is provided a coating monitoring device comprising: the device comprises a coating impedance sensing module, a coating impedance acquisition module and a coating impedance measurement module;
the coating impedance sensing module is arranged on the surface of the coating and is used for sensing the change of the resistance and/or the capacitance of the coating;
the coating impedance acquisition module and the coating impedance sensing module are connected to form a resonant circuit, and the resonant circuit is used for acquiring the change of resonant frequency in the resonant circuit caused by the change of the coating resistance and/or the coating capacitance;
the coating impedance measuring module is connected with the coating impedance acquisition module and used for calculating the aging result of the coating according to the change of the resonant frequency.
According to one embodiment of the invention, the coating impedance sensing module comprises: a base plate and an electrode assembly;
the bottom plate is a flexible film arranged on the surface of the coating;
the electrode assembly is attached to the base plate.
In particular, the present embodiment provides an implementation of a coating impedance sensing module, which implements sensing of a change in coating resistance or coating capacitance by providing a base plate and an electrode assembly.
Further, the bottom plate is made of a flexible film insulating material, and the electrode assembly is prepared by magnetron sputtering of an aluminum foil.
It should be noted that when the coating absorbs water or micro-cracks occur inside the coating due to ultraviolet radiation, the dielectric constant of the coating increases, which in turn leads to an increase in the capacitance of the coating and a decrease in the resistance of the coating. By monitoring the resonant frequency between the coating resistance and capacitance and a resistance-capacitance (RC) circuit within the resonant circuit, the value of the resistance-capacitance of the coating on the surface of the impedance sensor can be calculated, thereby calculating the aging grade of the coating from laboratory data.
According to one embodiment of the present invention, the electrode assembly includes a working electrode and a counter electrode;
the working electrode and the counter electrode are arranged in a comb-tooth-shaped crossed manner;
wherein the surfaces of the bottom plate, the working electrode and the counter electrode are sprayed with paint, and the paint has the same material composition as the coating.
Specifically, the present embodiment provides an implementation of an electrode assembly, which is sprayed and cured according to a coating process of a coating after the electrode assembly is attached to a base plate, so as to ensure that the coating on the surface of the coating impedance sensing module has the same physicochemical characteristics as the outer coating of the whole component, thereby more accurately reflecting the coating aging state of the whole component.
According to one embodiment of the invention, the distance between every two adjacent teeth of the working electrode and the counter electrode is between 0.5mm and 5 mm.
In particular, this embodiment provides another embodiment of the electrode assembly that ensures accurate acquisition of the coating impedance by taking into account the distance between each adjacent two teeth of the comb of the working electrode and the counter electrode.
According to one embodiment of the invention, a first outgoing line welding spot connected with the coating impedance sensing module is arranged on the working electrode;
and a second outgoing line welding spot connected with the coating impedance sensing module is arranged on the counter electrode.
Specifically, the present embodiment provides another implementation of an electrode assembly, in which a first lead-out wire pad and a second lead-out wire pad are arranged, the electrode assembly is led out of the coating and is connected to a coating impedance sensing module, and the coating impedance sensing module uses the frequency output of the multi-resonator to calculate the oscillation frequency of a resonant circuit formed by the coating impedance between the two comb teeth and the external resistance.
Further, when the coating is subjected to capacitance increase or resistance reduction caused by electrolyte permeation, photooxidation degradation and the like, the resonant frequency of the oscillator is changed, and the aging state of the coating can be monitored through frequency change.
The coating aging detection device provided by the invention has the advantages of simple operation, lossless process and intuitive evaluation index, can be widely applied to the aging state diagnosis of the aluminum alloy vehicle body coating, and provides scientific basis for determining the coating maintenance and replacement cycle.
According to an embodiment of the invention, the coating impedance acquisition module comprises: the device comprises a first impedance transmitter, a second impedance transmitter, a resistance-capacitance element and a resonator;
the first impedance transmitter is connected with the first outgoing line welding spot;
the second impedance transmitter is connected with the second outgoing line welding spot;
a discharge pin of the resonator is connected with the first impedance transmitter, and a threshold pin of the resonator is connected with the second impedance transmitter;
the resonator is connected with the resistance-capacitance element.
Specifically, the present embodiment provides an implementation manner of a coating impedance acquisition module, which implements amplification and impedance transformation of a signal by providing a first impedance transmitter and a second impedance transmitter, where the amplified signal is transmitted to a resonator and charges a resistance-capacitance unit.
It should be noted that the first impedance transmitter and the second impedance transmitter are arranged to ensure that the circuit can generate an accurate square wave signal after waveform shaping.
In one application scenario, the resonator is LMC555, R b And C 1 Forming a resistance-capacitance unit, wherein the coating resistance and the capacitance between two comb electrodes respectively adopt R c And C c The comb-shaped aluminum foil electrode composed of the working electrode and the counter electrode is connected to a first impedance transmitter and a second impedance transmitter through a shielding cable for signal amplification and impedance conversion, and the amplified signal passes through R 2 And R 3 Inputting the voltage to a discharge pin and a threshold pin of the LMC555, and providing a resistor R b And C 1 Charging is carried out such that R b And C 1 Composite resistance-capacitance resonance and coating sensor R c And C c A multi-resonator circuit is formed and a square wave signal is output at the pin of the resonator, and the frequency of the square wave signal is as follows:
according to one embodiment of the invention, the coating impedance measuring module comprises: the device comprises a controller, a real-time clock, a power supply and a data memory;
the controller is respectively connected with the real-time clock and the resonator and is used for counting the resonance frequency output by the resonator and recording the current time through the real-time clock;
the data storage is connected with the controller and is used for storing the coating aging result calculated by the controller;
the power supply is respectively connected with the resonator and the data storage and used for supplying power to the resonator and the data storage.
Specifically, this embodiment provides another implementation of the coating impedance acquiring module, where the square wave output by the resonator is subjected to a frequency technique by using a timer of the controller, and the controller requests the current time from the real-time clock, and writes the counting result and information such as the test time into the data storage, or uploads the counting result and information such as the test time to the terminal device through the communication interface for display. The electric energy of all circuit modules is supplied by a power supply, and the power supply can output power supplies with two specifications of 5V and 3.3V to supply power for analog circuits and digital circuits respectively.
According to an embodiment of the invention, the coating impedance measuring module further comprises: and the terminal equipment is in communication connection with the controller and is used for receiving the coating aging result calculated by the controller.
Specifically, the embodiment provides an implementation manner of a coating impedance measurement module, and by setting a terminal device, the calculation result of the controller is displayed, so that the aging of the coating is conveniently and intuitively observed.
According to a second aspect of the present invention, there is provided a monitoring method based on the above coating monitoring device, including:
acquiring the coating impedance at the current moment;
acquiring the coating impedance at the initial moment and the coating impedance when the coating fails completely;
the aging factor of the coating was calculated according to the following formula:
in the formula: rho is an aging coefficient;
R C (t 0 ) Coating impedance at the initial moment;
R C (t x ) Is the coating impedance at the present moment;
R C (t ∞ ) The coating resistance at complete failure of the coating;
and establishing a maintenance strategy according to the calculated coating aging coefficient.
One or more technical schemes in the invention have at least one of the following technical effects: according to the coating monitoring device and the monitoring method, the sensing module which senses the resistance and/or the capacitance of the coating and the acquisition module connected with the sensing module are arranged to form the resonant circuit, the resonant frequency change caused by the resistance and/or the capacitance change of the coating is acquired, the aging degree of the coating is monitored, and the coating monitoring device has the advantages of simplicity in operation, no damage to the process and intuitive evaluation index, can be widely applied to the aging state diagnosis of the coating of the aluminum alloy vehicle body, and provides scientific basis for the determination of the maintenance and replacement period of the coating.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram illustrating the arrangement of coating impedance sensing modules in the coating monitoring device provided by the present invention;
FIG. 2 is a schematic view of a coating monitoring device according to the present invention;
FIG. 3 is a second schematic view of the arrangement of the coating monitoring device according to the present invention.
Reference numerals:
10. a coating impedance sensing module; 11. A base plate; 12. A working electrode;
13. a counter electrode; 14. A first outgoing line solder joint; 15. A second outgoing line welding spot;
20. a coating impedance acquisition module; 21. A first impedance transmitter; 22. A second impedance transmitter;
23. a resistance-capacitance element; 24. A resonator; 30. A coating impedance measurement module;
31. a controller; 32. A real-time clock; 33. A power source;
34. a data memory; 35. A terminal device; 40. Coating resistance;
50. and (4) coating the capacitor.
Detailed Description
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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Fig. 1 is a schematic diagram illustrating the arrangement of a coating impedance sensing module 10 in the coating monitoring device provided by the present invention. The arrangement relationship of the base plate 11, the working electrode 12, the counter electrode 13, the first lead wire solder joint 14 and the second lead wire solder joint 15 in the coating impedance sensing module 10 is mainly shown.
The coating impedance sensing module 10 is adhered to the coating surface of a certain component of the railway vehicle and is sprayed by adopting the same coating process as the coating, so that the coating on the surface of the coating impedance sensing module 10 and the external coating of the whole component have the same physical and chemical characteristics, and the aging state of the coating of the whole component can be reflected more accurately. As the coating on the surface of the thin film impedance sensor ages, microcracks form in the coating, which, upon absorption of water, increase the coating dielectric constant and coating capacitance 50. Wherein the bottom plate 11 is a PE substrate of the film sensor, the working electrode 12 and the counter electrode 13 are comb-shaped aluminum foil double electrodes, and the coating capacitor 50 is C in a coating equivalent circuit c The coating resistance 40 is R in the coating equivalent circuit c R, as the coating ages progressively, fails c Decrease, C c And (4) increasing. So that their RC oscillation frequency with the circuit of the resonator 24 changes.
In an application scene, the coating monitoring device provided by the invention can also be applied to other equipment for spraying the coating on the surface of the component.
In one application scenario, the manufacturing process of the coating impedance sensing module 10 includes the following steps: s1: selecting a flexible polyester film with the thickness of 0.1mm as a substrate, then using a copper plate as a comb electrode mask plate, and evaporating pure aluminum onto the resin substrate by magnetron sputtering, wherein the evaporation time is controlled at 60 minutes, and the evaporation speed is controlled at 10 nm/min;
s2: removing the mask copper plate, leaving aluminum foil strips on the resin substrate, forming symmetrical double-comb-teeth electrodes, cleaning the surface of the flexible electrode by absolute ethyl alcohol, and adhering the reverse side of the film on the surface of an aluminum alloy plate or a vehicle body by using an epoxy resin adhesive;
s3: protecting the leading-out wires of the first impedance transmitter 21 and the second impedance transmitter 22 by using a protective adhesive tape, then spraying the protecting adhesive tape together with an aluminum alloy substrate or a vehicle body, and removing the protective adhesive tape of the electric cable after curing;
s4: the two-core cable wire is connected to the input of the resonator 24, and the frequency of the resonator 24 is counted by the controller 31.
FIG. 2 is a schematic view of a coating monitoring device according to the present invention. The arrangement relation of all parts of the coating monitoring device is mainly shown.
In one application scenario, C 1 Taking 100nF, C 2 And C 3 Take 0.1uF, R 2 、R 4 、R 3 、R 6 All take 1k omega, R 1 Take 1k Ω, R b Take 100M Ω, C 10 Taking 15pF, the power supply 33 selects LM7233 to output 3.3V and TPS7250 to output 5.0V direct current, 3.3V respectively supplies power to the controller 31, the data storage 34 and the real-time clock 32, 5.0V supplies power to the LMC555 resonator 24 and the signal amplifier, and when the coating is in a good state, the coating resistor 40 is 10 DEG 10 Ωcm 2 When the square wave frequency output by the resonator 24 is 0.143Hz, the thin film coating sensor is placed in a salt spray box for corrosion, and when the coating impedance R is high c Down to 10 8 Ωcm 2 The output square wave frequency was 0.286Hz, and the coating resistance was 40R as the coating was further reduced c Down to 10 6 Ωcm 2 The output square wave frequency is 14.3 Hz. Therefore, by measuring the change of the frequency, the coating impedance can be calculated, and the aging coefficient of the coating can be evaluated.
FIG. 3 is a second schematic view of the arrangement of the coating monitoring device according to the present invention. The arrangement relationship of the coating monitoring device is further shown.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention may be understood as specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In some embodiments of the present invention, as shown in fig. 1-3, the present solution provides a coating monitoring device comprising: the coating impedance sensing module 10, the coating impedance acquisition module 20 and the coating impedance measurement module 30; the coating impedance sensing module 10 is arranged on the surface of the coating and is used for sensing the change of the coating resistance 40 and/or the coating capacitance 50; the coating impedance acquisition module 20 and the coating impedance sensing module 10 are connected to form a resonant circuit, and are used for acquiring the change of resonant frequency in the resonant circuit caused by the change of the coating resistance 40 and/or the coating capacitance 50; the coating impedance measuring module 30 is connected to the coating impedance acquiring module 20, and is used for calculating the aging result of the coating according to the change of the resonant frequency.
In detail, the invention provides a coating monitoring device, which is used for solving the problem that in the failure process of a coating, an aqueous solution penetrates through the coating and enters a coating/substrate interface to cause corrosion of a metal substrate, for some functional coatings, the coating fails and cannot be seen by naked eyes but loses the functions, the occurrence of corrosion causes potential safety hazards such as substrate corrosion and the like, and by arranging a sensing module for sensing the resistance and/or the capacitance of the coating and an acquisition module connected with the sensing module to form a resonant circuit, the resonant frequency change caused by the resistance and/or the capacitance change of the coating is acquired, so that the aging degree of the coating is monitored.
In some possible embodiments of the invention, the coating impedance sensing module 10 comprises: a base plate 11 and an electrode assembly; the bottom plate 11 is a flexible film arranged on the surface of the coating; the electrode assembly is attached to the base plate 11 by magnetron sputtering.
Specifically, the present embodiment provides an embodiment of the coating impedance sensing module 10, which implements sensing of changes in the coating resistance 40 or the coating capacitance 50 by providing the base plate 11 and the electrode assembly.
Further, the bottom plate 11 is made of a flexible film insulating material, and the electrode assembly is prepared by magnetron sputtering of an aluminum foil.
It should be noted that when the coating absorbs water or micro-cracks occur inside the coating due to ultraviolet radiation, the dielectric constant of the coating increases, which in turn leads to an increase in the coating capacitance 50 and a decrease in the coating resistance 40. By monitoring the resonant frequency between the coating resistance 40 and the capacitance and the internal resistance-capacitance (RC) circuit of the resonant circuit, the resistance-capacitance value of the coating on the surface of the impedance sensor can be calculated, thereby calculating the aging grade of the coating from laboratory data.
In some possible embodiments of the invention, the electrode assembly includes a working electrode 12 and a counter electrode 13; the working electrode 12 and the counter electrode 13 are arranged in a comb-tooth-shaped crossed manner; wherein, the surfaces of the bottom plate 11, the working electrode 12 and the counter electrode 13 are sprayed with paint, and the paint and the material composition of the coating are the same.
Specifically, the present embodiment provides an implementation of an electrode assembly, in which after the electrode assembly is adhered to the bottom plate 11, the electrode assembly is sprayed and cured according to a coating process of a coating layer, so as to ensure that the coating layer on the surface of the coating impedance sensing module 10 has the same physicochemical characteristics as the outer coating layer of the whole component, thereby reflecting the coating aging state of the whole component more accurately.
In some possible embodiments of the invention, the distance between every two adjacent comb teeth of the working electrode 12 and the counter electrode 13 is between 0.5mm and 5 mm.
In particular, the present embodiment provides another embodiment of the electrode assembly, which ensures accurate acquisition of the coating impedance by taking into account the distance between every two adjacent comb teeth of the working electrode 12 and the counter electrode 13.
In some possible embodiments of the present invention, the working electrode 12 is provided with a first lead wire pad 14 connected to the coating impedance sensing module 10; the counter electrode 13 is provided with a second lead wire pad 15 connected to the coating impedance sensing module 10.
Specifically, the present embodiment provides another embodiment of an electrode assembly, in which the electrode assembly is led out of the coating by arranging the first lead wire pad 14 and the second lead wire pad 15, and is connected to the coating impedance sensing module 10, and the coating impedance sensing module 10 calculates the oscillation frequency of the resonant circuit formed by the coating impedance between the two comb teeth and the external resistor by using the frequency output of the multi-resonator 24.
Further, when the coating increases in capacitance 50 or decreases in resistance due to electrolyte permeation, photo-oxidative degradation, or the like, the resonant frequency of the oscillator is changed, and the aging state of the coating can be monitored by the change in frequency.
The coating aging detection device provided by the invention has the advantages of simple operation, nondestructive process and intuitive evaluation index, can be widely applied to the aging state diagnosis of the aluminum alloy vehicle body coating, and provides scientific basis for determining the maintenance and replacement period of the coating.
In some possible embodiments of the invention, the coating impedance acquisition module 20 comprises: a first impedance transmitter 21, a second impedance transmitter 22, a resistive-capacitive element 23, and a resonator 24; the first impedance transmitter 21 is connected to the first outgoing line solder joint 14; the second impedance transmitter 22 is connected to the second outgoing line solder joint 15; the discharging pin of the resonator 24 is connected with the first impedance transmitter 21, and the threshold pin of the resonator 24 is connected with the second impedance transmitter 22; the resonator 24 is connected to the resistance-capacitance element 23.
Specifically, the present embodiment provides an implementation of the coating impedance collecting module 20, which implements amplification and impedance transformation of a signal by arranging the first impedance transmitter 21 and the second impedance transmitter 22, and the amplified signal is transmitted to the resonator 24 and charges the rc unit.
It should be noted that the arrangement of the first impedance transmitter 21 and the second impedance transmitter 22 ensures that the circuit can generate an accurate square wave signal after waveform shaping.
In one application scenario, the resonator 24 is an LMC555, R b And C 1 Forming a resistance-capacitance unit, wherein R is respectively adopted as a coating resistor 40 and a capacitor between two comb-tooth electrodes c And C c Typically, the comb-shaped aluminum foil electrode composed of the working electrode 12 and the counter electrode 13 is connected to the first impedance transmitter 21 and the second impedance transmitter 22 via shielded cable for signal amplification and impedance transformation, and the amplified signal passes through R 2 And R 3 Inputting the voltage to a discharge pin and a threshold pin of the LMC555, and providing a resistor R b And C 1 Charging is carried out such that R b And C 1 Composite resistance-capacitance resonance and coating sensor R c And C c A multi-resonator 24 circuit is formed and a square wave signal is output at the resonator 24 pin, with a frequency of:
in some possible embodiments of the invention, the coating impedance measurement module 30 comprises: a controller 31, a real time clock 32, a power supply 33 and a data memory 34; the controller 31 is respectively connected with the real-time clock 32 and the resonator 24, and is configured to count the resonant frequency output by the resonator 24 and record the current time through the real-time clock 32; the data storage 34 is connected with the controller 31 and used for storing the coating aging result calculated by the controller 31; a power supply 33 is connected to the resonator 24 and the data storage 34 for supplying power to the resonator 24 and the data storage 34, respectively.
Specifically, in this embodiment, another implementation manner of the coating impedance collecting module 20 is provided, in which the square wave output by the resonator 24 is subjected to a frequency technique by a timer of the controller 31, and the controller 31 requests the current time from the real-time clock 32, and writes the counting result and information such as the test time into the data memory 34, or uploads the counting result and information such as the test time to the terminal device 35 through the communication interface for displaying. The power of all circuit modules is supplied by a power supply 33, and the power supply 33 can output power supplies 33 with two specifications of 5V and 3.3V to respectively supply power for analog circuits and digital circuits.
In some possible embodiments of the invention, the coating impedance measurement module 30 further comprises: and the terminal device 35, wherein the terminal device 35 is in communication connection with the controller 31 and is used for receiving the coating aging result calculated by the controller 31.
Specifically, the present embodiment provides an implementation manner of the coating impedance measuring module 30, and by providing the terminal device 35, the calculation result of the controller 31 is displayed, so as to facilitate intuitive observation of the aging of the coating.
In some embodiments of the present invention, the present disclosure provides a monitoring method based on the above coating monitoring device, including:
acquiring the coating impedance at the current moment;
acquiring the coating impedance at the initial moment and the coating impedance when the coating completely fails;
the aging factor of the coating was calculated according to the following formula:
in the formula: rho is an aging coefficient;
R C (t 0 ) Coating impedance at the initial moment;
R C (t x ) Is the coating impedance at the present moment;
R C (t ∞ ) The coating resistance at complete failure of the coating;
and establishing a maintenance strategy according to the calculated coating aging coefficient.
In detail, the invention also provides a monitoring method of the coating monitoring device, which is used for solving the problem that in the failure process of the coating, aqueous solution penetrates through the coating and enters the coating/substrate interface to cause corrosion of a metal substrate, for some functional coatings, the coating fails and is invisible to naked eyes but loses the function, the occurrence of corrosion causes potential safety hazards such as substrate corrosion, and the like, and the monitoring of the aging degree of the coating is realized by collecting the change of resonance frequency caused by the change of resistance and/or capacitance of the coating.
In an application scene, carrying out interval division on the aging coefficient rho, and when the aging coefficient is less than or equal to a first preset value, avoiding maintenance; when the aging coefficient is between a first preset value and a second preset value, closely checking; when the aging coefficient is larger than a second preset value, the coating needs to be replaced.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Finally, it should be noted that: the above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (6)
1. A coating monitoring device, comprising: the device comprises a coating impedance sensing module, a coating impedance acquisition module and a coating impedance measurement module;
the coating impedance sensing module is arranged on the surface of the coating and is used for sensing the change of the resistance and/or the capacitance of the coating;
the coating impedance acquisition module and the coating impedance sensing module are connected to form a resonant circuit, and the resonant circuit is used for acquiring the change of resonant frequency in the resonant circuit caused by the change of the coating resistance and/or the coating capacitance;
the coating impedance measuring module is connected with the coating impedance acquisition module and used for calculating the aging result of the coating according to the change of the resonant frequency;
the coating impedance sensing module includes: a base plate and an electrode assembly; the bottom plate is a flexible film arranged on the surface of the coating; the electrode assembly is attached to the base plate;
the electrode assembly includes a working electrode and a counter electrode; the working electrode and the counter electrode are arranged in a comb-tooth-shaped crossed manner; wherein the surfaces of the bottom plate, the working electrode and the counter electrode are sprayed with paint, and the paint and the coating have the same material composition;
a first outgoing line welding spot connected with the coating impedance sensing module is arranged on the working electrode; a second outgoing line welding spot connected with the coating impedance sensing module is arranged on the counter electrode;
the coating impedance acquisition module comprises: the device comprises a first impedance transmitter, a second impedance transmitter, a resistance-capacitance element and a resonator; the first impedance transmitter is connected with the first outgoing line welding spot; the second impedance transmitter is connected with the second outgoing line welding spot; a discharge pin of the resonator is connected with the first impedance transmitter, and a threshold pin of the resonator is connected with the second impedance transmitter; the resonator is connected with the resistance-capacitance element.
2. A coating monitoring device according to claim 1, wherein the distance between each adjacent two teeth of the working electrode and the counter electrode is between 0.5mm and 5 mm.
3. A coating monitoring device according to claim 1, wherein the coating impedance measuring module comprises: a controller, a power supply and a data memory;
the controller is connected with the resonator and is used for counting the resonance frequency output by the resonator;
the data storage is connected with the controller and used for storing the coating aging result calculated by the controller;
the power supply is respectively connected with the resonator and the data storage and used for supplying power to the resonator and the data storage.
4. A coating monitoring device according to claim 3, wherein the coating impedance measuring module further comprises: and the real-time clock is connected with the controller and is used for recording the current time for counting the resonant frequency output by the resonator.
5. The coating monitoring device of claim 3, wherein the coating impedance measuring module further comprises: and the terminal equipment is in communication connection with the controller and is used for receiving the coating aging result calculated by the controller.
6. A monitoring method based on the coating monitoring device of any one of the preceding claims 1 to 5, comprising:
acquiring the coating impedance at the current moment;
acquiring the coating impedance at the initial moment and the coating impedance when the coating fails completely;
the aging factor of the coating was calculated according to the following formula:
in the formula: rho is an aging coefficient;
R C (t 0 ) Coating impedance at the initial moment;
R C (t x ) Is as followsCoating impedance at a previous time;
R C (t ∞ ) The coating resistance at complete failure of the coating;
and establishing a maintenance strategy according to the calculated coating aging coefficient.
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| US6911828B1 (en) * | 2001-05-23 | 2005-06-28 | Southwest Research Institute | Apparatus and method for detecting the degradation of a coating using embedded sensors |
| US20050274611A1 (en) * | 2004-05-25 | 2005-12-15 | Schlichting Kevin W | Probes for electrochemical impedance spectroscopy |
| US20070120572A1 (en) * | 2005-11-30 | 2007-05-31 | Weiguo Chen | Smart coupon for realtime corrosion detection |
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| US8138768B2 (en) * | 2007-01-30 | 2012-03-20 | Nxp B.V. | Sensing circuit for devices with protective coating |
| CN101246116A (en) * | 2008-03-31 | 2008-08-20 | 南京航空航天大学 | Concrete reinforcement erosion wireless detecting method and sensor |
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