CN101144769B - Five electrode steel bar corrosion monitoring sensor and its preparation method - Google Patents
Five electrode steel bar corrosion monitoring sensor and its preparation method Download PDFInfo
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- CN101144769B CN101144769B CN2007101443967A CN200710144396A CN101144769B CN 101144769 B CN101144769 B CN 101144769B CN 2007101443967 A CN2007101443967 A CN 2007101443967A CN 200710144396 A CN200710144396 A CN 200710144396A CN 101144769 B CN101144769 B CN 101144769B
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Abstract
The invention provides a reinforced bar rust monitoring sensor with five electrodes and the preparation method thereof. The monitoring sensor comprises a reference electrode, an auxiliary electrode and a working electrode which are respectively arranged in the reserved fixing holes of a casing body, two equating electrodes which are same as the monitored steel material and the casing body of the sensor, wherein, the casing body is trunk shaped, the working electrode, the auxiliary electrode and two equating electrodes are arranged at intervals, the working electrode, the two equating electrodes and the auxiliary electrode are respectively connected with a lead wire, and the lead wire is led out of the casing body of the sensor. A structure with the complete solid reference electrode and the two equating electrodes which are adopted by the invention can achieve the advanced electrochemistry noise test, and identify if a pitting corrosion trend of the reinforced bar exists in the concrete. The all-round information of the rust of the reinforced bar in the concrete is provided by using the invention and the matched electrochemistry collecting system, and the scientific basis for the healthy monitoring and full service life designing of the structure is provided.
Description
(1) technical field
The present invention relates to the sensor technology used in a kind of civil engineering work, be specifically related to a kind of civil engineering works structure health monitoring monitoring corrosion of steel sensor.
(2) background technology
Under the concrete environment, because concrete poriness, moisture and oxygen can be along hole and crackle migrations, and this is the necessary condition of corrosions of steel such as mild carbon steel and high strength alloy steel just.It is in these holes because the hydration process of cement has formed the oxyhydroxide of calcium, sodium and the potassium of high concentration that reason for corrosion does not take place under most of situations, thereby kept pH value between 12-13, this high basicity environment is the steel passivation, forms the quick corrosion that fine and close γ type iron oxide has prevented steel.Yet work as Cl
-(from deicer salts or seawater) assembled or because CO at rebar surface through concrete surface
2The effect of (from atmosphere, also being one of key factor that causes global warming) makes under the situation of hole solution pH value reduction, and passivating film is destroyed, and concrete lost efficacy to the protective effect of reinforcing bar, at O
2And H
2Under the situation of O abundance reinforcing steel area reduce or occur the erosion point.
The steel bar corrosion that studies show that in past is to cause one of steel and concrete structure damage and failure reasons, the whole world has dropped into a large amount of expenses to the maintenance and repair and the replacing member of corrosion structure, and the monitoring of steel bar corrosion is the important component part of monitoring structural health conditions and life-cycle design in civil engineering work.The corrosion process of most in the civil engineering work (except the reaction of part high-temperature oxydation) steel all is an electrochemical process, so electrochemical method becomes the most essential method of steel corrosion in the monitoring of structures.Researcher both domestic and external in the last few years adopts electrochemical method that the corrosion science problem has been carried out a large amount of research, research by stable state and transient state electrochemical method, not only can obtain such as corrosion electric current density, the such basic parameter of corrosion rate, can also learn the more detailed information that discloses the corrosion electrochemistry process, as the generating process of polarization resistance, electric double layer capacitance, diffusion process, spot corrosion etc.The measurement of these parameters can provide foundation more reliably for corrosion monitoring.
Electrochemical method is the most essential method that discloses the corrosion science problem, yet adopt the electrochemical method research etching problem overwhelming majority to be in the past to carry out under the laboratory conditions, how electrochemical method being applied to actual engineering became in recent years the focus of research both at home and abroad.Undoubtedly electrochemical method is ripe and reliably in principle, and at concrete engineering how framework sensor and acquisition system, building application platform for electrochemical method is the concrete technical matters that actual engineering will solve, and this also is and the opportunity and the challenge of depositing.
(3) summary of the invention
The object of the present invention is to provide a kind of five electrode steel bar corrosion monitoring sensor that in civil engineering works structure health monitoring, has long-life, stable performance.
Product structure of the present invention by: it comprises that being installed in housing respectively reserves contrast electrode in the fixed orifice, auxiliary electrode, working electrode, two and monitored identical electrode and the sensor housing of being equal to of steel material, housing is tubular, working electrode, auxiliary electrode and two are equal to the electrode gap setting, working electrode, two are equal to electrode and auxiliary electrode connects lead respectively, and lead is drawn sensor housing.
Product of the present invention can also comprise some architectural features like this:
1, described contrast electrode is the ASSRE-1 all-solid-state reference electrode, adopts the Ag/AgCl/KClsat system, and outwards being followed successively by purity by the axle center from contrast electrode is that 99.99% Ag, AgCl layer, three component porous layers and grout layer constitute;
2, described contrast electrode is MnO
2Solid state reference electrode or liquid contrast electrode;
3, described auxiliary electrode is a graphite electrode;
4, described auxiliary electrode is stainless steel, platinum or other conductive corrosion-resistant material;
5, described working electrode, auxiliary electrode and be equal to electrode in the form of sheets.
Another object of the present invention is to provide a kind of preparation method who adopts electrochemical method can carry out the five electrode steel bar corrosion monitoring sensor of comprehensive monitoring to the Rust of Rebar in Concrete state.
Preparation method of the present invention is: the cartridge type housing and the electrode sheath that at first prepare the installing electrodes position; next carries out electrode fixed head and electrode outlet and seal area processing; prepare the contrast electrode package tube once more; carry out the assembling of five electrode corrosion monitoring sensors at last; be about to the reserved location that electrode used therein is installed in cylinder interior; the ASSRE-1 all-solid-state reference electrode at first is installed; three working electrodes are installed then; the graphite auxiliary electrode is installed once more, last installing electrodes protective sleeve and leading-out terminal sealing cap.
Ultimate principle of the present invention is according to five electrode corrosion monitoring sensors provided by the present invention, electrochemical impedance spectroscopy in the employing galvanochemistry and stable state, transient test technology are carried out comprehensive monitoring to the corrosion state of reinforcing bar, adopt the state-of-the-art electrochemical noise technique of research spot corrosion to carry out spot corrosion generation status monitoring simultaneously.As adopt weak polarization method that polarization resistance, the B value of steel bar corrosion are measured, thereby obtain the rusting rate of reinforcing bar; The employing harmonic analysis method directly obtains the corrosion electric current density in the steel bar corrosion process; Adopt continuous current or constant potential step can obtain information such as the electric double layer capacitance of polarization resistance, reinforcing bar/concrete interface in the steel bar corrosion process and concrete resistance rapidly; The employing electrochemical impedance spectroscopy can be studied the dynamic process in the steel bar corrosion process, and the control information of corrosion process etc. is provided;
Adopt electrochemical noise technique whether spot corrosion takes place the identification reinforcing bar.Electrochemistry noise analysis (Electrochemical Noise Analysis) is meant adopts suitable various mathematical measures or model that electrochemistry noise is reasonably resolved, and gets rid of interfering data (interference noise), obtains Useful Information.Electrochemistry noise need not be set up the electrode process model of tested systems in advance before measuring; Also need not satisfy electrochemical impedance spectroscopy (EIS) and measure 3 pacing itemss (causality, linearity and stability) that institute must immittance, and can realize remote monitoring.The analysis of the EN that is obtained by current potential and electric current continuous recording in time can come research and analysis by a lot of methods.These analytical approachs comprise that FFT, the MEM in statistical method, the frequency domain asks for methods such as power spectrum PSD, wavelet analysis, chaos analysis.Whether the electrochemistry noise analysis finally can be taken place in the identification spot corrosion.
Five electrode corrosion monitoring sensors of institute of the present invention framework provide strong platform for electrochemical method in the corrosion of monitoring steel bars in concrete.Adopt wherein 1 working electrode, all-solid-state reference electrode and graphite auxiliary electrode can carry out most of performance tests in the electrochemical method, as electrochemical impedance spectroscopy (Electrochemical Impedance Spectroscopy, EIS), stable state and transient test, obtain the more comprehensive information of steel bar corrosion state; Adopt all-solid-state reference electrode and two frameworks that are equal to electrode can realize (whether Electrochemical Noise Measurement ENM), can exist the spot corrosion tendency to carry out identification to reinforcing bar in the concrete in advanced electrochemistry noise test.Use the five electrode corrosion sensors invented, and adopt supporting galvanochemistry acquisition system, the comprehensive information of Rust of Rebar in Concrete can be provided, for the health monitoring and the life-cycle design of structure provides scientific basis.
(4) description of drawings
Fig. 1 is the not installment work electrode of having developed, two sterograms of the present invention that are equal to electrode and auxiliary electrode;
Fig. 2 is an electrode sheath portion front view;
Fig. 3 is an electrode sheath portion vertical view;
Fig. 4 is an electrode fixed head front view;
Fig. 5 is an electrode fixed head vertical view;
Fig. 6 is electrode outlet and seal area front view;
Fig. 7 is electrode outlet and seal area left view;
Fig. 8 is the package tube front view of all-solid-state reference electrode;
Fig. 9 is the package tube vertical view of all-solid-state reference electrode.
(5) specific embodiments
For example the present invention is done more detailed description below in conjunction with accompanying drawing:
Present embodiment comprise be installed in respectively housing reserve ASSRE-1 all-solid-state reference electrode 5 in the fixed orifice, graphite auxiliary electrode, working electrode 4, two with identical electrode and the sensor housing 1 of being equal to of the steel material of monitoring, housing 1 is tubular, working electrode, auxiliary electrode and two are equal to the electrode gap setting, working electrode, two are equal to electrode and auxiliary electrode connects lead 9 respectively, and lead 9 is drawn sensor housing 1.ASSRE-1 all-solid-state reference electrode 5 adopts the Ag/AgCl/KClsat systems, and outwards being followed successively by purity by the axle center from contrast electrode is that 99.99% Ag, AgCl layer, three component porous layers and grout layer constitute; Working electrode 4, auxiliary electrode and be equal to electrode in the form of sheets.
The preparation method of present embodiment is: the cartridge type housing 1 and the electrode sheath 2 that at first prepare the installing electrodes position; next carries out electrode fixed head 3 and electrode outlet and seal area processing; prepare the contrast electrode package tube once more; carry out the assembling of five electrode corrosion monitoring sensors at last; be about to the reserved location that electrode used therein is installed in cylinder interior; ASSRE-1 all-solid-state reference electrode 5 at first is installed; three working electrodes 4 are installed then; the graphite auxiliary electrode is installed once more, last installing electrodes protective sleeve and leading-out terminal sealing cap 6.
Specify below in conjunction with accompanying drawing:
1. electrode sheath
Concrete size is seen Fig. 2.The employing organic glass is made, and the hole of sidewall is to stop that the stone that particle diameter is bigger in the concrete enters test zone, thereby influences measurement result.Openend inwall processing M8 * 1.25, the degree of depth at sheath are that the interior of 10mm buckled, so that sheath is connected with the electrode fixed area.
2. electrode fixed head processing
Concrete size is seen Fig. 4.The organic glass sheet that adopts two thickness to be 10mm is opened the hole that diameter is 10mm and 2mm in four quadrant districts of disc respectively.At diameter is that hole inwall processing M8 * 1.25, the degree of depth of 10mm is the interior button of 10mm, is equal to electrode with steady job electrode, graphite auxiliary electrode and two.Diameter is that the hole of 2mm is used for outlet.Then with two with chloroform bonding, the center of circle in the hole on must guaranteeing two aligns.Is the outer button of 10mm at last, is used for and being connected of electrode sheath and seal area in bonding firm two organic glass outer walls processing M8 * 1.25, the degree of depth.
3. electrode outlet and seal area processing
Concrete size is seen Fig. 6.In the end inwall that is connected with electrode fixed area processing M8 * 1.25, the degree of depth is the interior button of 10mm, is used for and being connected of electrode fixed area.
4. contrast electrode package tube
Concrete size is seen Fig. 8.Prolong the place, midsection of sheath axis, in 180 ° of planes, locate out the hole that diameter is 2mm, see Fig. 9 at 0 °, 90 ° and 180 °.The effect of these three apertures is to make all-solid-state reference electrode and the conducting of concrete electrolysis matter.
5. the assembling of five electrode corrosion monitoring sensors
At first the working electrode that processes, two are equal to electrode and auxiliary electrode welding lead, the sealing of AB glue is adopted in lead and electrode junction; Next is put into package tube with all-solid-state reference electrode and is fixed on the electrode fixed head shown in Figure 4, must guarantee 3 holes of being opened in the middle of the package tube and the axial alignment that the hole of other electrode is installed; The working electrode, two that will weld lead once more is equal to electrode and auxiliary electrode is installed on the electrode fixed head shown in Figure 4, will twine adhesive waterproof tape outer the buckling of electrode before installing, and adopts AB glue or epoxy sealing once more in the electrode outlet; At last electrode sheath shown in Figure 2 and electrode outlet shown in Figure 6 and sealing shroud are connected with the electrode fixed head that installs electrode shown in Figure 4, before electrode outlet shown in Figure 6 and sealing shroud wherein are installed silicone glass cement 7 is injected in this sheath, thus the further reliability that guarantees sealing.
Claims (3)
1. five electrode steel bar corrosion monitoring sensor, it is characterized in that: it comprise be installed in respectively housing reserve contrast electrode in the fixed orifice, auxiliary electrode, working electrode, two with identical electrode and the sensor housing of being equal to of the steel material of monitoring, housing is tubular, working electrode, auxiliary electrode and two are equal to the electrode gap setting, working electrode, two are equal to electrode and auxiliary electrode connects lead respectively, and lead is drawn sensor housing; Described contrast electrode is the ASSRE-1 all-solid-state reference electrode, adopts the Ag/AgCl/KClsat system, and outwards being followed successively by purity by the axle center from contrast electrode is that 99.99% Ag, AgCl layer, three component porous layers and grout layer constitute; Described working electrode, auxiliary electrode and be equal to electrode in the form of sheets.
2. a kind of five electrode steel bar corrosion monitoring sensor according to claim 1 is characterized in that: described auxiliary electrode is a graphite electrode.
3. the preparation method of a five electrode steel bar corrosion monitoring sensor as claimed in claim 1, it is characterized in that: the cartridge type housing and the electrode sheath that at first prepare the installing electrodes position, next carries out electrode fixed head and electrode outlet and seal area processing, prepare the contrast electrode package tube once more, carry out the assembling of five electrode corrosion monitoring sensors at last, be about to the reserved location that electrode used therein is installed in cylinder interior, the ASSRE-1 all-solid-state reference electrode at first is installed, then installment work electrode and two with the identical electrode that is equal to of the steel material of monitoring, the graphite auxiliary electrode is installed once more, last installing electrodes protective sleeve and leading-out terminal sealing cap; Described contrast electrode is the ASSRE-1 all-solid-state reference electrode, adopts the Ag/AgCl/KClsat system, and outwards being followed successively by purity by the axle center from contrast electrode is that 99.99% Ag, AgCl layer, three component porous layers and grout layer constitute.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101443967A CN101144769B (en) | 2007-09-29 | 2007-09-29 | Five electrode steel bar corrosion monitoring sensor and its preparation method |
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| CN2007101443967A CN101144769B (en) | 2007-09-29 | 2007-09-29 | Five electrode steel bar corrosion monitoring sensor and its preparation method |
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| CN101144769A CN101144769A (en) | 2008-03-19 |
| CN101144769B true CN101144769B (en) | 2010-08-18 |
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Families Citing this family (11)
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| CN101334353B (en) * | 2008-08-01 | 2010-12-08 | 厦门大学 | Multifunctional sensor for monitoring reinforced concrete structure erosion |
| CN101738368B (en) * | 2008-11-18 | 2012-10-03 | 北京市水利规划设计研究院 | Concrete pipe cathode protection testing probe and testing method |
| CN102087202B (en) * | 2010-11-17 | 2012-08-22 | 哈尔滨工业大学 | Preparation method of all solid state reference electrode for monitoring reinforcement corrosion |
| CN102353705B (en) * | 2011-06-28 | 2013-04-17 | 哈尔滨工业大学 | Preparation method of comb-shaped sensing unit for monitoring corrosion of steel |
| CN102889848B (en) * | 2011-07-22 | 2015-03-04 | 宝山钢铁股份有限公司 | Electrochemical quantitative characterization method of nanoscale oxide film |
| CN102507429B (en) * | 2011-10-21 | 2014-05-21 | 天津大学 | Corrosion detection sensor based on electrochemistry theory |
| CN103018299B (en) * | 2012-12-07 | 2014-07-16 | 国家电网公司 | Couple corrosion sensor |
| CN104005032B (en) * | 2014-05-08 | 2016-08-24 | 青岛双瑞海洋环境工程股份有限公司 | The cathode protection testing probe in Prestressed concrete cylinder pipe road and preparation method |
| CN106053326A (en) * | 2016-07-19 | 2016-10-26 | 青岛理工大学 | Monitoring system for monitoring durability deterioration evolution of reinforced concrete structure |
| CN108362636B (en) * | 2017-12-29 | 2021-07-09 | 上海神力科技有限公司 | Method for testing corrosion resistance of bipolar plate for fuel cell |
| CN115656027B (en) * | 2022-11-01 | 2023-06-13 | 哈尔滨工业大学 | Multifunctional wireless node for electrochemical monitoring of corrosion of steel-concrete structure |
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| US5139627A (en) * | 1986-05-12 | 1992-08-18 | Capcis Limited | Corrosion monitoring |
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| CN1471623A (en) * | 2000-07-19 | 2004-01-28 | �ܻ��Ǽ��� | Embeddable corrosion monitoring-instrument for steel reinforced structures |
| CN1438478A (en) * | 2003-03-20 | 2003-08-27 | 上海交通大学 | Method for detecting corrosion of concrete bar in reinforced concrete |
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