CN117214076A - Comprehensive analysis device and monitoring method for corrosion state of marine structure - Google Patents
Comprehensive analysis device and monitoring method for corrosion state of marine structure Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 169
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- 239000002184 metal Substances 0.000 claims abstract description 24
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Abstract
The application discloses a comprehensive analysis device and a monitoring method for corrosion states of marine structures, which can realize real-time monitoring of the stripping degree of a coating of a structure to be monitored and the performance of a sacrificial anode by the comprehensive analysis device for the corrosion states of the marine structures, and acquire the actual corrosion rate of a metal structure under the protection of the sacrificial anode after the coating is stripped. The comprehensive analysis device and the monitoring method for the corrosion state of the marine structure can realize the state monitoring of two common corrosion protection means of a coating and a sacrificial anode at the same time; meanwhile, the close connection between the monitoring equipment and the structure to be monitored in the ocean is realized, and the problem that the reliability of monitoring data is lacking because the traditional monitoring equipment is independent of the structure to be monitored and cannot be subjected to the actual cathodic protection effect of the structure to be monitored is solved; and further, the reliability of monitoring data is ensured, and the method has important value for corrosion and protection of marine engineering equipment.
Description
Technical Field
The application relates to the technical field of ocean engineering key supporting equipment, in particular to a comprehensive analysis device and a monitoring method for corrosion states of ocean structures.
Background
Corrosion is an important factor in the loss of marine metal structures. In marine engineering, coatings and sacrificial anodes are commonly used as a means of corrosion protection. However, since the coating and the sacrificial anode are mostly in underwater areas, it is difficult to achieve effective monitoring of the coating state and the working performance of the sacrificial anode, and thus, development of reliable monitoring equipment is required.
Existing marine engineering corrosion protection monitoring equipment typically monitors coating and sacrificial anode performance only in a single piece. However, in practical engineering, the two are often combined, and interference effects which are mutually influenced exist. In addition, the existing monitoring equipment is generally independent of the structure to be monitored, no coupling relation is established between the existing monitoring equipment and the structure, and reliability of monitoring data is lacking.
Disclosure of Invention
The application provides a comprehensive analysis device and a monitoring method for corrosion states of marine structures, which aim to overcome the technical problems.
In order to achieve the above object, the technical scheme of the present application is as follows:
the comprehensive analysis device for the corrosion state of the marine structure comprises a device shell, an array electrode probe assembly, a device bottom plate, a welding fixing plate and an analysis terminal; the welding fixing plate is fixedly connected with the position to be detected of the structure to be monitored, and the device bottom plate is fixedly arranged with the welding fixing plate;
the device shell is of a cavity structure with one end open, and the open end of the device shell is fixedly connected with the device bottom plate to form a sealed cavity structure;
the top end of the sealed cavity structure is provided with a component mounting hole structure, and the array electrode probe component is fixedly connected with the sealed cavity structure through the component mounting hole structure;
the top end part of the array electrode probe assembly is provided with an anti-corrosion coating, and the array electrode probe assembly is used for monitoring the coating state of a structure to be monitored;
the array electrode probe assembly is connected with the mounting circuit board through a wire, an underwater cable connector is reserved on the side wall of the sealing cavity structure, one end of the underwater cable connector is connected with the mounting circuit board, and the other end of the underwater cable connector is connected with the analysis terminal through an underwater cable;
the analysis terminal is used for evaluating the damage grade of the anti-corrosion coating according to the damage points monitored by the array electrode probe assembly.
Further, the array electrode probe assembly comprises a probe shell, a first epoxy resin filling layer, an anti-corrosion coating, a coating state monitoring electrode device and a plurality of electrodes; the plurality of electrodes includes a sacrificial anode performance monitoring electrode, a working electrode, a reference electrode, and a counter electrode;
the coating state monitoring electrode device is arranged at the center of the probe shell; the top end of the coating state monitoring electrode device is provided with an anti-corrosion coating;
the sacrificial anode performance monitoring electrode and the working electrode are arranged in the probe shell and are oppositely arranged at two ends of the coating state monitoring electrode device;
the reference electrode and the counter electrode are arranged on two sides of the working electrode;
and a first epoxy resin filling layer is formed among the probe shell, the coating state monitoring electrode device and the plurality of electrodes, and the coating state monitoring electrode device and the plurality of electrodes are fixedly arranged in the probe shell through filling epoxy resin in the first epoxy resin filling layer.
Further, the coating state monitoring electrode device comprises a plurality of coating state monitoring electrodes, a fixed die and a second epoxy resin filling layer;
the coating state monitoring electrode is of an integrated structure formed by connecting a first structural member and a second structural member; the fixed die is uniformly provided with a plurality of fixed hole structures, and the coating state monitoring electrode is fixedly connected with the fixed die through a second structural member; the bottom end of the second structural member is connected with the mounting circuit board through a wire;
and forming a second epoxy resin filling layer between each coating state monitoring electrode, wherein the distance between the adjacent coating state monitoring electrodes does not exceed a preset threshold value.
Further, the welding fixture plate is used for fixing the bottom plate of the mounting device;
the welding fixed plate is fixedly connected with the structure to be monitored, the welding fixed plate is connected with the device bottom plate through bolts, and an insulating gasket is arranged between the device bottom plate and the bolts.
Further, the mounting circuit board is provided with a multiplexer, a first zero resistance ammeter a, a second zero resistance ammeter b, a third zero resistance ammeter c, a signal generator and a voltmeter;
one end of the multiplexer is connected with each coating state monitoring electrode respectively, the other end of the multiplexer is connected with one end of the first zero resistance ammeter a, and the other end of the first zero resistance ammeter a is connected with the device shell;
one end of the second zero resistance ammeter b is connected with the sacrificial anode performance monitoring electrode, and the other end of the second zero resistance ammeter b is connected with the device shell;
one end of the voltmeter is connected with the reference electrode, one end of the third zero resistance ammeter c is connected with the counter electrode, and the other end of the voltmeter, the other end of the third zero resistance ammeter c and the working electrode are connected with one end of the signal generator;
the reference electrode, the counter electrode and the working electrode form a three-electrode system, and the other end of the signal generator is grounded.
A monitoring method of a marine structure corrosion state comprehensive analysis device comprises the following steps:
step S1: the electric couple current i flowing through each coating state monitoring electrode is acquired through a first zero-resistance ammeter a based on a multiplexer 1 -i 25 ；
Collecting cathodic protection current i flowing through sacrificial anode performance monitoring electrode through second zero-resistance ammeter b protect ；
Step S2: based on a three-electrode system, a signal generator is used for applying a potentiodynamic scanning signal, and a third zero-resistance ammeter c and a voltmeter are used for measuring the self-corrosion current i of a working electrode by adopting a linear polarization method corr ；
Step S3: the acquired couple current i flowing through each coating state monitoring electrode 1 -i 25 Cathodic protection current i of sacrificial anode performance monitoring electrode protect Working electrodeIs the self-corrosion current i of (2) corr Transmitting the data to an analysis terminal through an underwater cable;
step S4: according to the self-corrosion current i of the working electrode corr Calculating the self-corrosion rate CR of the working electrode, wherein the calculation formula is as follows
Wherein: m is the molar mass of the metal to be measured, F is Faraday constant, ρ m Is the density of the metal to be measured;
determining anodic dissolution current i of sacrificial anode performance monitoring electrode according to Bulter-Volmer equation aprotect Cathode current i with sacrificial anode performance monitoring electrode cprotect The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is that
i cprotect ＝i protect +i aprotect (2)
Wherein: Δe represents the potential difference between the electrode and its self-corrosion potential under the protection of the coating and the sacrificial anode; b a And b c Respectively representing the slopes of an anode and a cathode Tafel of the metal structural material in the working environment;
and from formulas (2) to (4) can be simplified to obtain formula (5)
b a ln(i aprotect )+b c ln(i protect +i aprotect )＝(b a +b c )ln(i corr ) (5)
Step S5: reducing equation (4) to anodic dissolution current i for a sacrificial anode performance monitoring electrode aprotect Is calculated as the following formula
Performing first-order taylor expansion on the formula (5), and neglecting infinitesimal terms to obtain a formula (7):
(b a +b c )i protect +bc(i protect +i aprotect )＝(b a +b c )i corr (7)
the anodic dissolution current i of the sacrificial anode performance monitoring electrode can be obtained by the formula (7) aprotect Approximation i of (2) aprotect * Is that
Step S6: to approximate value b aprotect * Is the initial value and monitors the cathodic protection current i of the electrode according to the performance of the sacrificial anode protect Is of the order of x 10 -3 Setting iteration times, and carrying out iterative calculation according to a formula (6);
anodic dissolution current i of the electrode is monitored if the anode performance is currently sacrificed aprotect Anodic dissolution current i of sacrificial anode performance monitoring electrode obtained from last iteration aprotect If the difference value is smaller than or equal to a preset threshold value, the anodic dissolution current i of the current sacrificial anode performance monitoring electrode aprotect The target current is obtained;
anodic dissolution current i of the electrode is monitored if the anode performance is currently sacrificed aprotect Anodic dissolution current i of sacrificial anode performance monitoring electrode obtained from last iteration aprotect If the difference value is larger than a preset threshold value, continuing iteration;
step S7: monitoring anodic dissolution current i of the electrode based on the obtained sacrificial anode properties aprotect Calculating to obtain the actual corrosion rate of the sacrificial anode performance monitoring electrode;
step S8: monitoring cathodic protection current i of electrode according to sacrificial anode performance protect Setting a critical current for stripping the coating;
and critical current of the coating stripping = 1/10 x i protect
Based on analysis terminal statistics, couple current i flowing through each coating state monitoring electrode 1 -i 25 And recording the number n of currents exceeding the critical current for coating stripping;
step S9: adding n current values exceeding the critical current of the coating stripping to obtain a weighted current i d And according to the weighted current i d Estimating a coating stripping proportion alpha;
the estimation formula of the coating stripping proportion alpha is that
The coating peel-off grade was evaluated based on the coating peel-off proportion α.
Further, step S7 further includes obtaining a maximum corrosion rate allowed by the structure to be monitored according to the given corrosion allowance and service life of the structure to be monitored, and determining the maximum corrosion rate allowed by the structure to be monitored and the actual corrosion rate of the sacrificial anode performance monitoring electrode;
if the maximum corrosion rate allowed by the structure to be monitored is greater than the actual corrosion rate of the sacrificial anode performance monitoring electrode, judging that the sacrificial anode of the structure to be monitored has a protective effect;
and if the maximum corrosion rate allowed by the structure to be monitored is smaller than the actual corrosion rate of the sacrificial anode performance monitoring electrode, judging that the sacrificial anode protection effect of the structure to be monitored is insufficient.
Further, the actual corrosion rate of the sacrificial anode performance monitoring electrode is calculated in step S7, and the calculation formula is as follows
Wherein: m represents the molar mass of the metal to be measured; f represents Faraday constant; ρ m Representing the density of the metal to be measured；i aprotect Anodic dissolution current i representing the sacrificial anode performance monitoring electrode after iteration aprotect 。
The beneficial effects are that: the application discloses a comprehensive analysis device and a monitoring method for corrosion states of marine structures, wherein the comprehensive analysis device for corrosion states of the marine structures can be used for monitoring the corrosion protection means of the coating stripping degree and the sacrificial anode performance of a structure to be monitored, acquiring the actual corrosion rate of a metal structure under the protection of the sacrificial anode after the coating stripping failure, and simultaneously realizing the tight connection between monitoring equipment and the structure to be monitored in the sea, thereby solving the problem that the reliability of monitoring data is lacking because the traditional monitoring equipment is independent of the structure to be monitored and cannot be subjected to the actual cathodic protection action of the structure to be monitored; and further, the reliability of monitoring data is ensured, and the method has important value for corrosion and protection of marine engineering equipment.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a comprehensive analysis device for corrosion state of a marine structure according to the present application;
FIG. 2 is a schematic diagram of an array electrode probe of the marine structure corrosion state comprehensive analysis device of the application;
FIG. 3 is a diagram showing the structure of a coating state electrode of the marine structure corrosion state comprehensive analysis device of the present application;
FIG. 4 is a schematic diagram of a monitoring circuit of the marine structure corrosion state comprehensive analysis device of the application;
FIG. 5 is a flow chart of a method of monitoring a marine structure corrosion state analysis device of the present application.
In the figure: 1. a device housing; 2. an array electrode probe assembly; 21. a probe housing; 22. a first epoxy resin filling layer; 23. an anti-corrosion coating; 24. coating state monitoring electrode device; 241. a coating state monitoring electrode; 2411. a first structural member; 2412. a second structural member; 242. fixing a die; 2421. a fixed hole structure; 243. a second epoxy resin filler layer; 25. a sacrificial anode performance monitoring electrode; 26. a working electrode; 27. a reference electrode; 28. a counter electrode; 3. a device base plate; 4. sealing the cavity structure; 41. a component mounting hole structure; 5. an underwater cable connector; 6. welding a fixing plate; 7. a bolt; 8. an insulating spacer; 9. a multiplexer; 10. a first zero resistance ammeter a; 11. a second zero resistance ammeter b; 12. a third zero resistance ammeter c; 13. a signal generator; 14. a voltmeter.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The embodiment provides a comprehensive analysis device for corrosion states of marine structures, which is shown in fig. 1 and comprises a device shell 1, an array electrode probe assembly 2, a device bottom plate 3, a welding fixing plate 6 and an analysis terminal; the welding fixed plate 6 is fixedly connected with the position to be detected of the structure to be monitored, and the device bottom plate 3 is fixedly arranged with the welding fixed plate 6; the materials of the device bottom plate 3, the welding fixing plate 6 and the structure to be monitored are identical; the welding fixture plate 6 is welded and fixed with a structure to be monitored, a plurality of connecting holes are locally formed in the welding fixture plate 6, bolt penetrating holes are formed in the device bottom plate 3 relative to the connecting holes of the welding fixture plate 6, the welding fixture plate 6 is connected with the device bottom plate 3 through bolts 7, and insulating gaskets 8 are arranged between the device bottom plate 3 and the bolts 7, so that electric insulation treatment is conducted between the bolts 7 and the welding fixture plate 6.
The device shell 1 is of a cavity structure with one end open, and the open end of the device shell 1 is fixedly connected with the device bottom plate 3 to form a sealed cavity structure 4;
the top end of the sealed cavity structure 4 is provided with a component mounting hole structure 41, and the array electrode probe component 2 is fixedly connected with the sealed cavity structure 4 through the component mounting hole structure 41;
the top end part of the array electrode probe assembly 2 is provided with an anti-corrosion coating 23, and the array electrode probe assembly 2 is used for detecting a breakage point of a to-be-detected position of a structure to be monitored;
the array electrode probe assembly 2 is connected with the mounting circuit board through a wire, an underwater cable connector 5 is reserved on the side wall of the sealing cavity structure 4, one end of the underwater cable connector 5 is connected with the mounting circuit board, and the other end of the underwater cable connector 5 is connected with the analysis terminal through an underwater cable;
the analysis terminal is used for evaluating the damage grade of the anti-corrosion coating 23 according to the damage points detected by the array electrode probe assembly 2 and detecting the corrosion rate of the sacrificial anode under the condition corresponding to the damage grade based on the electrode probe assembly 2.
In the actual detection process, the damage condition of the anti-corrosion coating on the surface of the marine structure can influence the corrosion rate of the sacrificial anode of the marine structure, and the traditional marine engineering corrosion protection monitoring equipment is used for monitoring the performance of the coating and the sacrificial anode only singly, so that the detection time is long, and the detection result is inaccurate; the comprehensive analysis device for the corrosion state of the marine structure can realize the monitoring method of two corrosion protection means, namely the coating stripping degree and the sacrificial anode performance monitoring of the structure to be monitored, obtain the actual corrosion rate of the metal structure under the protection of the sacrificial anode after the coating stripping failure, and simultaneously realize the close connection between the monitoring equipment and the structure to be monitored in the sea, thereby solving the problem that the reliability of the monitoring data is lack due to the fact that the traditional monitoring equipment is independent of the structure to be monitored and cannot be subjected to the actual cathodic protection action of the structure to be monitored; and further, the reliability of monitoring data is ensured, and the method has important value for corrosion and protection of marine engineering equipment.
In a specific embodiment, as shown in fig. 2, the array electrode probe assembly 2 includes a probe housing 21, a first epoxy fill layer 22, a corrosion-resistant coating 23, a coating status monitoring electrode arrangement 24, and a plurality of electrodes; the plurality of electrodes includes a sacrificial anode performance monitoring electrode 25, a working electrode 26, a reference electrode 27, and a counter electrode 28; the materials of the probe shell 21, the sacrificial anode performance monitoring electrode 25 and the working electrode 26 are completely the same as those of the structure to be monitored; the anti-corrosion coating 23 is completely consistent with the coating used for the structure to be monitored;
the first epoxy resin filling layer 22 is used for filling epoxy resin among the probe shell 21, the coating state monitoring electrode device 24 and the plurality of electrodes, and plays a role in insulation and fixation;
the coating state monitoring electrode device 24 is arranged at the center of the probe shell 21, and the plane of the top end of the coating state monitoring electrode device 24 coincides with the plane of the top end of the probe shell 21; and the top end of the coating state monitoring electrode device 24 is provided with an anti-corrosion coating 29;
the sacrificial anode performance monitoring electrode 25 and the working electrode 26 are arranged inside the probe shell 21 and are oppositely arranged at two ends of the coating state monitoring electrode device 24;
the reference electrode 27 and the counter electrode 28 are arranged at two sides of the working electrode 26, and the centers of the working electrode 26, the reference electrode 27 and the counter electrode 28 are positioned on the same plane;
the probe case 21, the coating state monitoring electrode device 24, and the plurality of electrodes are provided with a first epoxy resin filling layer 22 therebetween, and the coating state monitoring electrode device 24 and the plurality of electrodes are fixedly provided inside the probe case 21 by filling the first epoxy resin filling layer 22 with epoxy resin.
In a specific embodiment, as shown in fig. 3, the coating state monitoring electrode device 24 includes a plurality of coating state monitoring electrodes 241, a fixing mold 242, and a second epoxy filling layer 243;
the coating state monitoring electrode 241 is an integral structure formed by connecting a first structural member 2411 and a second structural member 2412; the fixing mold 242 is uniformly provided with a plurality of fixing hole structures 2421, and the coating state monitoring electrode 241 is fixedly connected with the fixing mold 242 through a second structural member 2412; the bottom end of the second structural member 2412 is connected with the mounting circuit board through a wire;
a second epoxy resin filling layer 243 is formed between the coating state monitoring electrodes 241, and the distance between the adjacent coating state monitoring electrodes 241 does not exceed a preset threshold value of 0.2mm.
Wherein each of the coating state monitoring electrodes 241 has a structure of: the first structural member 2411 has a rectangular structure with a cross-sectional area of 2mm×2mm and a length of 20mm, and the second structural member 2412 has a cylindrical structure with a diameter of 0.9mm and a height of 4 mm. And the top of the coating state monitoring electrode 241 is a working surface, and a coating is coated; the second structural member 2412 of the coating state monitoring electrode 241 is inserted into the fixing mold 242 and fixed by the fixing mold 242, so that the interval between the working surfaces of the adjacent electrodes is ensured not to exceed 0.2mm, and monitoring errors caused by the difference of coating adhesive strength due to the difference of the surface properties of the epoxy resin and the coating state monitoring electrode 241 are avoided as much as possible.
In a specific embodiment, as shown in fig. 4, the mounting circuit board is provided with a multiplexer 9, a first zero-resistance ammeter a10, a second zero-resistance ammeter b11, a third zero-resistance ammeter c12, a signal generator 13 and a voltmeter 14;
one end of the multiplexer 9 is connected with each coating state monitoring electrode 241, and the other end of the multiplexer 9 is connected with one end of the first zero resistance ammeter a10, and the other end of the first zero resistance ammeter a10 is connected with the device housing 1;
specifically, the coating monitoring electrode 241 has 25 wires (i.e. electrodes), the multiplexer 9 is a multi-path switch, and by sequentially controlling each wire to be connected with one end of the first zero-resistance ammeter a10, the other end of the first zero-resistance ammeter a10 is further connected with the other 24 wires, and then the other end of the first zero-resistance ammeter a10 connected with the 24 wires is connected with the device housing 1, so that the measurement of the current flowing through each wire can be realized through the multiplexer;
one end of the second zero resistance ammeter b11 is connected with the sacrificial anode performance monitoring electrode 25, and the other end of the second zero resistance ammeter b11 is connected with the device shell 1; one end of the voltmeter 14 is connected with the reference electrode 27, one end of the third zero resistance ammeter c12 is connected with the counter electrode 28, and the other end of the voltmeter 14, the other end of the third zero resistance ammeter c12 and the working electrode 26 are connected with one end of the signal generator 13;
the reference electrode 27, the counter electrode 28 and the working electrode 26 form a three-electrode system, the reference electrode 27 and the counter electrode 28 are used for forming a three-electrode system for electrochemical testing with the working electrode 26, the three-electrode system is a standard corrosion rate measuring method, and the other end of the signal generator 13 is grounded.
A monitoring method of a marine structure corrosion state comprehensive analysis device is shown in fig. 5, and specifically comprises a monitoring method for evaluating the coating state and the performance of a sacrificial anode; the method comprises the following steps:
step S1: the electric couple current i flowing through each coating state monitoring electrode is acquired through a first zero-resistance ammeter a based on a multiplexer 1 -i 25 ；
Collecting cathodic protection current i flowing through sacrificial anode performance monitoring electrode through second zero-resistance ammeter b protect ；
Step S2: based on a three-electrode system, a signal generator is used for applying a potentiodynamic scanning signal, and a third zero-resistance ammeter c and a voltmeter are used for measuring the self-corrosion current i of a working electrode by adopting a linear polarization method corr ；
Step S3: the acquired couple current i flowing through each coating state monitoring electrode 1 -i 25 Cathodic protection current i of sacrificial anode performance monitoring electrode protect Self-etching current i of working electrode corr Transmitting the data to an analysis terminal through an underwater cable;
step S4: according to the self-corrosion current i of the working electrode corr Calculating the self-corrosion rate CR of the working electrode, wherein the calculation formula is as follows
Wherein: m is the molar mass of the metal to be measured, F is Faraday constant, ρ m Is the density of the metal to be measured;
determining anodic dissolution current i of sacrificial anode performance monitoring electrode according to Bulter-Volmer equation aprotect Cathode current i with sacrificial anode performance monitoring electrode cprotect The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is that
i cprotect ＝i protect +i aprotect (2)
Wherein: Δe represents the potential difference between the electrode and its self-corrosion potential under the protection of the coating and the sacrificial anode; b a And b c Respectively representing the slopes of an anode and a cathode Tafel of the metal structural material in the working environment; i.e protect And i aprotect Is two different meanings, i protect The current value flowing through the sacrificial anode performance monitoring electrode 25 is measured by a second zero resistance ammeter b, which is commonly referred to as the galvanic current. While the galvanic current value is actually the difference between the metal anode (anode) current and the cathode (cathode) current, i define herein the anodic dissolution current of the sacrificial anode performance monitoring electrode as i aprotect Defining the anodic dissolution current of the sacrificial anode performance monitoring electrode as i cprotect The method comprises the steps of carrying out a first treatment on the surface of the The metal corrosion is in effect electrochemical corrosion, including anodic and cathodic reactions, and corresponds to the anodic and cathodic reactionsThe currents are called anodic current and cathodic current, respectively;
and from formulas (2) to (4) can be simplified to obtain formula (5)
b a ln(i aprotect )+b c ln(i protect +i aprotect )＝(b a +b c )ln(i corr ) (5)
Step S5: reducing equation (4) to anodic dissolution current i for a sacrificial anode performance monitoring electrode aprotect Is calculated as the following formula
Performing first-order taylor expansion on the formula (5), and neglecting infinitesimal terms to obtain a formula (7):
(b a +b c )i aprotect +bc(i protect +i aprotect )＝(b a +b c )i corr (7)
the anodic dissolution current i of the sacrificial anode performance monitoring electrode can be obtained by the formula (7) aprotect Approximation i of (2) aprotect * Is that
Step S6: to approximate value i aprotect * Is the initial value and monitors the cathodic protection current i of the electrode according to the performance of the sacrificial anode protect Is of the order of x 10 -3 Setting iteration times, and carrying out iterative calculation according to a formula (6);
anodic dissolution current i of the electrode is monitored if the anode performance is currently sacrificed aprotect Anodic dissolution current i of sacrificial anode performance monitoring electrode obtained from last iteration aprotect If the difference value is smaller than or equal to a preset threshold value, the anodic dissolution current i of the current sacrificial anode performance monitoring electrode aprotect The target current is obtained;
anodic dissolution of the electrode if current sacrificial anode performance monitoringCurrent i aprotect Anodic dissolution current i of sacrificial anode performance monitoring electrode obtained from last iteration aprotect If the difference value is larger than a preset threshold value, continuing iteration;
step S7: calculating to obtain the actual corrosion rate of the sacrificial anode performance monitoring electrode according to the obtained anodic dissolution current iaprotection of the sacrificial anode performance monitoring electrode;
specifically, step S7 further includes obtaining a maximum corrosion rate allowed by the structure to be monitored according to a given corrosion allowance and a service life of the structure to be monitored, where the given corrosion allowance and the service life of the structure to be monitored are a given corrosion allowance and a service life of the metal structure design in the design process of the metal structure to be tested, which are not the means of the prior art, and are not described herein again; judging the maximum corrosion rate allowed by the structure to be monitored and the actual corrosion rate of the sacrificial anode performance monitoring electrode;
if the maximum corrosion rate allowed by the structure to be monitored is greater than the actual corrosion rate of the sacrificial anode performance monitoring electrode, judging that the performance of the sacrificial anode of the structure to be monitored has a protective effect;
if the maximum corrosion rate allowed by the structure to be monitored is smaller than the actual corrosion rate of the sacrificial anode performance monitoring electrode, judging that the performance protection effect of the sacrificial anode of the structure to be monitored is insufficient, and timely processing is needed, wherein the corresponding processing means and mode are not the application point and are not repeated herein;
the actual corrosion rate of the sacrificial anode performance monitoring electrode is obtained by calculation, and the calculation formula is
Wherein: m represents the molar mass of the metal to be measured; f represents Faraday constant; ρ m Representing the density of the metal to be measured; i.e aprotect Anodic dissolution current i representing the sacrificial anode performance monitoring electrode after iteration aprotect 。
Step S8: monitoring cathodic protection current i of electrode according to sacrificial anode performance protect Setting a critical current for stripping the coating;
and critical current of the coating stripping = 1/10 x i protect
Based on analysis terminal statistics, couple current i flowing through each coating state monitoring electrode 1 -i 25 And recording the number n of currents exceeding the critical current for coating stripping;
step S9: adding n current values exceeding the critical current of the coating stripping to obtain a weighted current i d And according to the weighted current i d Estimating a coating stripping proportion alpha;
the estimation formula of the coating stripping proportion alpha is that
The peel rating of the coating was evaluated based on the rating of peel rating of the evaluation of paint and varnish coating ageing in accordance with the specification GB/T30789.5-2015/ISO 4628-5:2003, in combination with the coating peel ratio alpha. The evaluation of the peeling degree of the aging evaluation of the paint and varnish coating is a prior known technology, and is not an application point of the present application and is not described herein.
In conclusion, the method integrates the monitoring methods of the corrosion rate under the conditions of coating stripping, sacrificial anode consumption and exposure, and can effectively realize comprehensive analysis of the corrosion state of the marine structure. Meanwhile, by means of an improved array electrode processing technology, the array electrode distance is greatly shortened, and errors of monitoring the coating state by adopting the array electrode due to the fact that the performances of the epoxy resin and the metal surface are different in service are reduced. And the coating state monitoring motor is coupled with the actual ocean structure through the device shell, so that the monitoring of the coating state under the protection state of an external cathode (sacrificial anode) in the actual ocean engineering environment is realized, and the actual engineering situation is more met. The method for monitoring the sacrificial anode consumption state is provided, and the performance of the sacrificial anode can be accurately judged by calculating the corrosion rate of the sacrificial anode in the protection state.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (8)
1. The comprehensive analysis device for the corrosion state of the marine structure is characterized by comprising a device shell (1), an array electrode probe assembly (2), a device bottom plate (3), a welding fixing plate (6) and an analysis terminal; the welding fixing plate (6) is fixedly connected with the position to be detected of the structure to be monitored, and the device bottom plate (3) is fixedly installed with the welding fixing plate (6);
the device comprises a device shell (1), a device bottom plate (3) and a sealing cavity structure (4), wherein the device shell (1) is of a cavity structure with one end open, and the open end of the device shell (1) is fixedly connected with the device bottom plate (3);
the top end of the sealing cavity structure (4) is provided with a component mounting hole structure (41), and the array electrode probe component (2) is fixedly connected with the sealing cavity structure (4) through the component mounting hole structure (41);
an anti-corrosion coating (23) is arranged at the top end part of the array electrode probe assembly (2), and the array electrode probe assembly (2) is used for monitoring the coating state of the position to be detected of the structure to be detected;
the array electrode probe assembly (2) is connected with the mounting circuit board through a wire, an underwater cable connector (5) is reserved on the side wall of the sealing cavity structure (4), one end of the underwater cable connector (5) is connected with the mounting circuit board, and the other end of the underwater cable connector (5) is connected with the analysis terminal through an underwater cable;
the analysis terminal is used for evaluating the damage grade of the anti-corrosion coating (23) according to the damage points monitored by the array electrode probe assembly (2).
2. The marine structure corrosion state comprehensive analysis device according to claim 1, wherein the array electrode probe assembly (2) comprises a probe housing (21), a first epoxy resin filling layer (22), an anti-corrosion coating layer (23), a coating state monitoring electrode device (24) and a plurality of electrodes; the plurality of electrodes includes a sacrificial anode performance monitoring electrode (25), a working electrode (26), a reference electrode (27), and a counter electrode (28);
the coating state monitoring electrode device (24) is arranged at the center of the probe shell (21); and the top end of the coating state monitoring electrode device (24) is provided with an anti-corrosion coating (29);
the sacrificial anode performance monitoring electrode (25) and the working electrode (26) are arranged in the probe shell (21) and are oppositely arranged at two ends of the coating state monitoring electrode device (24);
the reference electrode (27) and the counter electrode (28) are arranged on two sides of the working electrode (26);
a first epoxy resin filling layer (22) is formed among the probe shell (21), the coating state monitoring electrode device (24) and the plurality of electrodes, and the coating state monitoring electrode device (24) and the plurality of electrodes are fixedly arranged in the probe shell (21) through filling epoxy resin in the first epoxy resin filling layer (22).
3. The marine structure corrosion state comprehensive analysis device according to claim 1, wherein the coating state monitoring electrode device (24) comprises a plurality of coating state monitoring electrodes (241), a fixed die (242) and a second epoxy resin filling layer (243);
the coating state monitoring electrode (241) is of an integrated structure formed by connecting a first structural member (2411) and a second structural member (2412); the fixing die (242) is uniformly provided with a plurality of fixing hole structures (2421), and the coating state monitoring electrode (241) is fixedly connected with the fixing die (242) through a second structural member (2412); the bottom end of the second structural member (2412) is connected with the mounting circuit board through a wire;
a second epoxy resin filling layer (243) is formed between the coating state monitoring electrodes (241), and the distance between the adjacent coating state monitoring electrodes (241) does not exceed a preset threshold value.
4. The comprehensive analysis device for the corrosion state of the marine structure according to claim 3, wherein the welding fixing plate (6) is connected with the device bottom plate (3) through bolts (7), and insulating gaskets (8) are arranged between the device bottom plate (3) and the bolts (7).
5. The comprehensive analysis device for the corrosion state of the marine structure according to claim 3, wherein the installation circuit board is provided with a multiplexer (9), a first zero resistance ammeter a (10), a second zero resistance ammeter b (11), a third zero resistance ammeter c (12), a signal generator (13) and a voltmeter (14);
one end of the multiplexer (9) is respectively connected with each coating state monitoring electrode (241), the other end of the multiplexer (9) is connected with one end of the first zero resistance ammeter a (10), and the other end of the first zero resistance ammeter a (10) is connected with the device shell (1);
one end of the second zero resistance ammeter b (11) is connected with the sacrificial anode performance monitoring electrode (25), and the other end of the second zero resistance ammeter b (11) is connected with the device shell (1);
one end of the voltmeter (14) is connected with a reference electrode (27), one end of the third zero-resistance ammeter c (12) is connected with a counter electrode (28), and the other end of the voltmeter (14), the other end of the third zero-resistance ammeter c (12) and a working electrode (26) are connected with one end of the signal generator (13);
the reference electrode (27), the counter electrode (28) and the working electrode (26) form a three-electrode system, and the other end of the signal generator (13) is grounded.
6. A method for monitoring a marine structure corrosion state comprehensive analysis device according to any one of claims 1 to 5, comprising the steps of:
step S1: the electric couple current i flowing through each coating state monitoring electrode is acquired through a first zero-resistance ammeter a based on a multiplexer 1 -i 25 ；
Collecting cathodic protection current i flowing through sacrificial anode performance monitoring electrode through second zero-resistance ammeter b protect ；
Step S2: based on a three-electrode system, a signal generator is used for applying a potentiodynamic scanning signal, and a third zero-resistance ammeter c and a voltmeter are used for measuring the self-corrosion current i of a working electrode by adopting a linear polarization method corr ；
Step S3: the acquired couple current i flowing through each coating state monitoring electrode 1 -i 25 Cathodic protection current i of sacrificial anode performance monitoring electrode protect Self-etching current i of working electrode corr Transmitting the data to an analysis terminal through an underwater cable;
step S4: the analysis terminal is used for analyzing the self-corrosion current i of the working electrode corr Calculating the self-corrosion rate CR of the working electrode, wherein the calculation formula is as follows
Wherein: m is the molar mass of the metal to be measured, F is Faraday constant, ρ m Is the density of the metal to be measured;
determining anodic dissolution current i of sacrificial anode performance monitoring electrode according to Bulter-Volmer equation aprotect Cathode current i with sacrificial anode performance monitoring electrode cprotect The method comprises the steps of carrying out a first treatment on the surface of the The calculation formula is that
i cprotect ＝i protect +i protect (2)
Wherein: Δe represents the potential difference between the electrode and its self-corrosion potential under the protection of the coating and the sacrificial anode; b a And b c Respectively representing the slopes of an anode and a cathode Tafel of the metal structural material in the working environment;
and from formulas (2) to (4) can be simplified to obtain formula (5)
b a ln(i aprotect )+b c ln(i protect +i aprotect )＝(b a +b c )ln(i corr ) (5)
Step S5: reducing equation (4) to anodic dissolution current i for a sacrificial anode performance monitoring electrode aprotect Is calculated as the following formula
Performing first-order taylor expansion on the formula (5), and neglecting infinitesimal terms to obtain a formula (7):
(b a +b c )i protect +bc(i protect +i aprotect )＝(b a +b c )i corr (7)
the anodic dissolution current i of the sacrificial anode performance monitoring electrode can be obtained by the formula (7) aprotect Approximation i of (2) aprotect * Is that
Step S6: to approximate value i aprotect * Is the initial value and monitors the cathodic protection current i of the electrode according to the performance of the sacrificial anode protect Is of the order of x 10 -3 Setting iteration times, and carrying out iterative calculation according to a formula (6);
if the anode property is currently sacrificedAnodic dissolution current i of electrode can be monitored aprotect Anodic dissolution current i of sacrificial anode performance monitoring electrode obtained from last iteration aprotect o The difference value is smaller than or equal to a preset threshold value, and the anodic dissolution current i of the current sacrificial anode performance monitoring electrode aprotect The target current is obtained;
anodic dissolution current i of the electrode is monitored if the anode performance is currently sacrificed aprotect Anodic dissolution current i of sacrificial anode performance monitoring electrode obtained from last iteration aprotect o If the difference value is larger than a preset threshold value, continuing iteration;
step S7: monitoring anodic dissolution current i of the electrode based on the obtained sacrificial anode properties aprotect Calculating to obtain the actual corrosion rate of the sacrificial anode performance monitoring electrode;
step S8: monitoring cathodic protection current i of electrode according to sacrificial anode performance protect Setting a critical current for stripping the coating;
and critical current of the coating stripping = 1/10 x i protect
Based on analysis terminal statistics, couple current i flowing through each coating state monitoring electrode 1 -i 25 And recording the number n of currents exceeding the critical current for coating stripping;
step S9: adding n current values exceeding the critical current of the coating stripping to obtain a weighted current i d And according to the weighted current i d Estimating a coating stripping proportion alpha;
the estimation formula of the coating stripping proportion alpha is that
The coating peel-off grade was evaluated based on the coating peel-off proportion α.
7. The method according to claim 6, wherein step S7 further comprises obtaining a maximum allowable corrosion rate of the structure to be monitored according to a given corrosion allowance and service life of the structure to be monitored, and determining the maximum allowable corrosion rate of the structure to be monitored and an actual corrosion rate of the sacrificial anode performance monitoring electrode;
if the maximum corrosion rate allowed by the structure to be monitored is greater than the actual corrosion rate of the sacrificial anode performance monitoring electrode, judging that the sacrificial anode of the structure to be monitored has a protective effect;
and if the maximum corrosion rate allowed by the structure to be monitored is smaller than the actual corrosion rate of the sacrificial anode performance monitoring electrode, judging that the sacrificial anode protection effect of the structure to be monitored is insufficient.
8. The method for monitoring a corrosion state analysis device for a marine structure according to claim 6, wherein the actual corrosion rate of the sacrificial anode performance monitoring electrode is calculated in step S7 by a calculation formula of
Wherein: m represents the molar mass of the metal to be measured; f represents Faraday constant; ρ m Representing the density of the metal to be measured; i.e aprotect Anodic dissolution current i representing the sacrificial anode performance monitoring electrode after iteration aprotect 。
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