CN102507674B - Coating corrosion monitoring and detecting method of inner wall of metal pipe/tank - Google Patents
Coating corrosion monitoring and detecting method of inner wall of metal pipe/tank Download PDFInfo
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- CN102507674B CN102507674B CN201110324027.2A CN201110324027A CN102507674B CN 102507674 B CN102507674 B CN 102507674B CN 201110324027 A CN201110324027 A CN 201110324027A CN 102507674 B CN102507674 B CN 102507674B
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Abstract
The invention discloses a coating corrosion monitoring and detecting method of an inner wall of a metal pipe/tank, wherein a used detector comprises a sleeve, a panel, a spring, a partition plate, a fixing bracket, an auxiliary electrode and a reference electrode; the sleeve is hollow and openings are arranged at two ends so that the liquid in the sleeve can enter into a T-shaped bracket for in-situ electrochemical detection; the reference electrode and the auxiliary electrode contact the inner wall of the metal pipe through the liquid in the sleeve and form a conductive loop together with the solution in the sleeve and the inner wall of the detected metal pipe; and when the detection sensor is used for detecting the corrosion situations of a bared pipe of the metal pipe and the coating of the inner wall, the detector is arranged inside the metal pipe. The metal pipe is fixed with a probe and tightly contacts the probe through the spring, and an arc front end tightly contacts the inner wall of the metal pipe. The inner wall of the metal tank/pipe is tested by an electrochemical method in a monitoring process.
Description
Technical field
The present invention relates to a kind of corrosion detecting method, more particularly, relate to a kind of metal inner surface application corrosion detecting method based on electrochemical measurement principle.
Background technology
Metallic article plays an important role in national economy.Tubular metal goods are very general, and the little beverage can that arrives arrives greatly steel pipe.The most important failure mode that metallic article runs into is corrosion, so it is necessary that this based article is carried out to corrosive nature test.
Tinplate is that the food cans of material mainly contains three beverage cans, canned food and Biscuits, teas dry product tank etc.The anti-corrosion capability of food cans directly affects quality and the pot-life of content, but content is of a great variety. and the different ，Gei food cans of memory requirement manufacturer has proposed new problem.Understand and grasp the etch-proof basic condition of food cans, the production of tin graphed sheet Zhi Guan enterprise is had to real directive significance.
Steel pipe is in petroleum gas and municipal works, to apply maximum tubing.Its major advantage is: intensity is high, good toughness, bearing stress are large, and impact resistance and tightness are good, and plasticity is good, is convenient to welding and hot-working, and wall thickness is thinner, save metal.Corrosion resisting property is the important indicator that guarantees its Secure Application.Steel pipe makes steel pipe have the bulged tube that certain internal stress, particularly latest developments are got up in making and production run.
Tradition corrosion detecting method is by food cans, steel pipe, and petroleum pipelines etc. cut down, and make standard pattern, corrode detection.This method, owing to will destroying metal tube, will inevitably eliminate stress, and destroys the feature of metal tube itself, and testing result is not original position, the corrosion condition of reflection metal tube that can not be strictly according to the facts.
Use electrochemical sensor to corrode the method detecting, mainly monitor the corrosion characteristics of large-scale structures part, still, due to the problem of distribution of current, be difficult to obtain accurate result.Traditional sensors can not be put in metal tube, still needs to destroy metal tube and detects.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of metal pipe/tank interior finishing corrosion monitoring and detecting method based on electrochemical measurement principle is provided, be applicable to the pipeline of various sizes, this probe manufacturing process is simple, be quick on the draw, be easy to carry, simple during operation.Monitoring method is easy, and data resolvability is high, can judge rapidly metal tube naked pipe and inwall is coated with damaged situation, damaged type, the corrosion condition of extent of corrosion and naked pipe.
Object of the present invention is achieved by following technical proposals:
An interior finishing corrosion monitoring and detecting method, according to following step, carry out:
(1) detector is placed in metal pipe/tank to be measured, itself and metal pipe/tank inwall are fixed and close contact
(2) testing tool electrochemical workstation is connected with detector, wherein metal pipe/tank is as working electrode
(3) utilize galvanochemistry low-frequency impedance spectrum to test metal pipe/tank inwall, to obtain galvanochemistry low-frequency impedance spectrum.
Described detector comprises T-shaped pipe, sleeve pipe, panel, spring, dividing plate, fixed mount, auxiliary electrode and contrast electrode, wherein:
The vertical direction of described T-shaped pipe and the intersection of horizontal direction are provided with dividing plate, for one end of fixing spring.
The horizontal direction Shang， both sides of described T-shaped pipe are connected with a side of sleeve pipe respectively.
Described sleeve pipe is connected with the other end of spring, under the effect of spring, between described sleeve pipe and T-shaped pipe, realizes and sliding.
The opposite side of described sleeve pipe is provided with panel, arranges porose on described panel.
In sleeve pipe, be provided with for the fixing fixed mount of contrast electrode one end, described auxiliary electrode is wrapped on contrast electrode.
Described contrast electrode is fixed on fixed mount, its one end is connected with the binding post of contrast electrode, the other end is arranged in panel Shang hole, by liquid in pipe, contacts with inner wall of metal tube, detects tested metal tube naked pipe and the interior finishing corrosion potential in solution in pipe.On contrast electrode, be wound with the binding post 1 that auxiliary electrode ，Qi one end is connected with auxiliary electrode, the other end is arranged in panel Shang hole with together with the end of contrast electrode, forms galvanic circle with solution, tested inner wall of metal tube in pipe.
The binding post of described auxiliary electrode and contrast electrode is arranged in the vertical tube chamber of T-shaped pipe or higher than the vertical tube chamber of T-shaped pipe.
Horizontal tube chamber and being connected to of sleeve pipe of described T-shaped pipe are tightly connected.
Being connected between described sleeve pipe and panel is sealedly and fixedly connected.
The outside surface of described spring is provided with insulation course.
Described contrast electrode is Ag/AgCl electrode.
Described auxiliary electrode is screw type Pt silk.
In technical scheme of the present invention, T-shaped pipe, sleeve pipe, panel, spring, dividing plate and the fixed mount of detector all should adopt insulating material or with wrapped with insulation or coating, to avoid the danger such as electric leakage when surveying.Specifically, for example T-shaped pipe, sleeve pipe and fixed mount all can select organic glass as material; Spring selects rubber to wrap up; Panel is selected has certain flexible teflon as material, so that process, can make fit the better inside surface of testing container of panel simultaneously.
When testing, first enforce the spring between both sides sleeve pipe compression sleeve and dividing plate, whole detector is put into the container external force of dropping back out, now Compress Spring outwards acts on, promote the horizontal tube chamber generation relative motion of sleeve pipe and T-shaped pipe, until be positioned at the panel in outside, contact with the inside surface of container and intact laminating, now in whole detector, be full of liquid, in fact panel Shang hole forms the scope of electrochemical measurement, the contrast electrode that is wound with auxiliary electrode is arranged in panel Shang hole, can contact with inner surface of container.Finally carry out electro-chemical test, auxiliary electrode, contrast electrode are connected respectively, then using container wall as working electrode, be connected on electrochemical workstation, utilize galvanochemistry low-frequency impedance spectral technology to test inner wall of metal tube, according to the difference of the data obtained, the integrality that judgement metal tube naked pipe and inwall are coated with, damaged classification, the extent of corrosion of damaged degree and naked pipe.
Detector of the present invention can destroy metal tube, in metal tube, carry out electrochemical in-situ inspection, distribution of current is at specific area, can be quick, easily, carry out accurately electrochemical in-situ detection, obtain with high fidelity the information of metal tube naked pipe and interior finishing corrosion, determine area and the position in the naked pipe of surveying or application region, manufacture craft is simple, and wearing quality can adapt to long operation well, is easy to carry, and adjustable length, be applicable to various sizes metal tube naked pipe and interior finishing extent of corrosion carries out fast detecting and evaluation.Be convenient to, to the monitoring of real pipe on-line implement, be convenient to tank body goods sampling monitoring.Can adopt harmless electrochemical detection method, as the methods such as electrochemical impedance spectroscopy, linear polarization and charging curve method detect, continuation application that can overslaugh goods, reduces enterprise cost.
Accompanying drawing explanation
The structural representation of Fig. 1 detector of the present invention (one, cut-open view)
The structural representation of Fig. 2 detector of the present invention (two, vertical view)
Fig. 3 probing test design sketch of the present invention (one)
Fig. 4 probing test design sketch of the present invention (two)
Fig. 5 probing test design sketch of the present invention (three)
Fig. 6 probing test design sketch of the present invention (four)
Embodiment
Below in conjunction with specific embodiment, further illustrate technical scheme of the present invention.
As shown in attached Fig. 1 and 2, detector of the present invention comprises T-shaped pipe 3, and the vertical direction of described T-shaped pipe 3 and the intersection of horizontal direction are provided with dividing plate 11, for one end of fixing spring 4.The horizontal direction Shang， both sides of T-shaped pipe 3 are connected with a side of sleeve pipe 5 respectively.Sleeve pipe 5 is connected with the other end of spring 4, has realized and having slided since like this between the effect running casing 5 of spring 4 and T-shaped pipe 3.The opposite side of sleeve pipe 5 is provided with panel 6, and porose (in figure, do not mark, position is preferably in the central authorities of panel) is set on panel.
In sleeve pipe 5, be provided with for the fixing fixed mount 7 of contrast electrode one end.Contrast electrode 8 is fixed on fixed mount 7, its one end is connected with the binding post 2 of contrast electrode, the other end is arranged in panel Shang hole, by liquid in pipe, contacts with inner wall of metal tube, detects tested metal tube naked pipe and the interior finishing corrosion potential in solution in pipe.On contrast electrode 8, be wound with the binding post 1 that auxiliary electrode 9 ，Qi one end are connected with auxiliary electrode, the other end is arranged in panel Shang hole with together with the end of contrast electrode, forms galvanic circle with solution, tested inner wall of metal tube in pipe.The binding post setting of auxiliary electrode and contrast electrode is higher than the vertical tube chamber of T-shaped pipe.
Wherein the horizontal tube chamber of T-shaped pipe and being connected to of sleeve pipe are tightly connected.Being connected between sleeve pipe and panel is sealedly and fixedly connected.The outside surface of spring is provided with insulation course, selects rubber to wrap up.T-shaped pipe, sleeve pipe and fixed mount select organic glass as material.Panel is selected has certain flexible teflon as material, so that process, can make fit the better inside surface of testing container of panel simultaneously.Contrast electrode is Ag/AgCl electrode.Auxiliary electrode is screw type Pt silk.
When testing, first enforce the spring between both sides sleeve pipe compression sleeve and dividing plate, whole detector is put into the container external force of dropping back out, now Compress Spring outwards acts on, promote the horizontal tube chamber generation relative motion of sleeve pipe and T-shaped pipe, until be positioned at the panel in outside, contact with the inside surface of container and intact laminating, now in whole detector, be full of liquid, in fact panel Shang hole forms the scope of electrochemical measurement, the contrast electrode that is wound with auxiliary electrode is arranged in panel Shang hole, can contact with inner surface of container, be that on curved slab, hole act as test area on fixing metal tank, measuring region is hole region.Finally carry out electro-chemical test, auxiliary electrode, contrast electrode are connected respectively, then using container wall as working electrode, be connected on electrochemical workstation, utilize galvanochemistry low-frequency impedance spectral technology to test inner wall of metal tube, according to the difference of the data obtained, the integrality that judgement metal tube naked pipe and inwall are coated with, damaged classification, the extent of corrosion of damaged degree and naked pipe.
Select Preece's 2273 electrochemical workstations that pause, parameter is frequency: 10mHz-100kHz; AC signal amplitude 10mV, tests, wherein Z
im: low-frequency impedance real part/Z
re: low-frequency impedance imaginary part.During monitoring, utilize galvanochemistry low-frequency impedance spectrum to test metal can inwall.And from Preece's 2273 electrochemical workstations that pause, obtain experimental datas, i.e. galvanochemistry low-frequency impedance spectrum.Selecting metal can section bar is taggers tin.Interior finishing: epoxy novolac coating thickness 6 μ m, tin coating thickness 3 μ m.Test result is as shown in accompanying drawing 3 to 6.
Accompanying drawing 3 is metal can interior finishing galvanochemistry low-frequency impedance spectrums when complete: impedance spectrum only presents a time constant, this capacitive reactance arc characterizing coating electric capacity and coating resistance.(in electrochemical impedance spectroscopy, arc of every appearance, has a time constant.Figure is from left to right low frequency range, high frequency region.Be that the left side is low frequency range, the right is high frequency region.)
Accompanying drawing 4 is metal can interior finishing galvanochemistry low-frequency impedance spectrums while having cavity: impedance spectrum presents the feature of 2 time constants, the barrier propterty of the capacitive reactance arc characterizing coating of high frequency region, and the capacitive reactance arc of low frequency range characterizes the polarization resistance of base metal corrosion reaction.
When accompanying drawing 5 and 6 is metal can interior finishing badly broken time galvanochemistry low-frequency impedance spectrum: capacitive reactance arc in impedance spectrum high frequency region dwindles, the barrier propterty of characterizing coating is very poor, there is diffusion impedance in low frequency range, the electrode process characterizing now is mainly controlled by the polarization resistance of base metal corrosion reaction, and coating has lost protective action.Also the feature that there will be three time constants, this is mainly the sandwich construction due to coating taggers tin, the corrosion condition more complicated under coating.
Above the present invention has been done to exemplary description; should be noted that; in the situation that not departing from core of the present invention, the replacement that is equal to that any simple distortion, modification or other those skilled in the art can not spend creative work all falls into protection scope of the present invention.
Claims (7)
1. a metal pipe/tank interior finishing corrosion monitoring and detecting method, is characterized in that, according to following step, carries out:
(1) detector is placed in metal pipe/tank to be measured, itself and metal pipe/tank inwall are fixed and close contact;
(2) testing tool electrochemical workstation is connected with detector, wherein metal pipe/tank is as working electrode;
(3) utilize galvanochemistry low-frequency impedance spectrum to test metal pipe/tank inwall, to obtain galvanochemistry low-frequency impedance spectrum;
Described detector comprises T-shaped pipe, sleeve pipe, panel, spring, dividing plate, fixed mount, auxiliary electrode and contrast electrode, wherein:
The vertical direction of described T-shaped pipe and the intersection of horizontal direction are provided with dividing plate, for one end of fixing spring;
The horizontal direction Shang， both sides of described T-shaped pipe are connected with a side of sleeve pipe respectively;
Described sleeve pipe is connected with the other end of spring, under the effect of spring, between described sleeve pipe and T-shaped pipe, realizes and sliding;
The opposite side of described sleeve pipe is provided with panel, arranges porose on described panel;
In described sleeve pipe, be provided with for the fixing fixed mount of contrast electrode one end, described contrast electrode is fixed on the binding post that fixed mount Shang，Qi one end is connected with contrast electrode, and the other end is arranged in panel Shang hole, by liquid in pipe, contact with inner wall of metal tube, detect corrosion potential; On described contrast electrode, be wound with the binding post that auxiliary electrode ，Qi one end is connected with auxiliary electrode, the other end is arranged in panel Shang hole with together with the end of contrast electrode, forms galvanic circle with solution, tested inner wall of metal tube in pipe; Described panel Shang hole forms the scope of electrochemical measurement.
2. a kind of metal pipe/tank interior finishing corrosion monitoring and detecting method according to claim 1, is characterized in that, the binding post of described auxiliary electrode and contrast electrode is arranged in the vertical tube chamber of T-shaped pipe or higher than the vertical tube chamber of T-shaped pipe.
3. a kind of metal pipe/tank interior finishing corrosion monitoring and detecting method according to claim 1, is characterized in that, horizontal tube chamber and being connected to of sleeve pipe of described T-shaped pipe are tightly connected.
4. a kind of metal pipe/tank interior finishing corrosion monitoring and detecting method according to claim 1, is characterized in that, being connected between described sleeve pipe and panel is sealedly and fixedly connected.
5. a kind of metal pipe/tank interior finishing corrosion monitoring and detecting method according to claim 1, is characterized in that, the outside surface of described spring is provided with insulation course.
6. a kind of metal pipe/tank interior finishing corrosion monitoring and detecting method according to claim 1, is characterized in that, described contrast electrode is Ag/AgCl electrode.
7. a kind of metal pipe/tank interior finishing corrosion monitoring and detecting method according to claim 1, is characterized in that, described auxiliary electrode is screw type Pt silk.
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| CN201110324027.2A CN102507674B (en) | 2011-10-21 | 2011-10-21 | Coating corrosion monitoring and detecting method of inner wall of metal pipe/tank |
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| CN102830058B (en) * | 2012-09-04 | 2015-06-24 | 奥瑞金包装股份有限公司 | Metal can and electrochemical device for detecting corrosion strength of same |
| CN104807870A (en) * | 2014-01-24 | 2015-07-29 | 珠海格力电器股份有限公司 | Method and device for detecting compactness of coating on inner wall of container |
| CN105239995B (en) * | 2015-09-25 | 2018-02-02 | 中国石油天然气股份有限公司 | Three-electrode potential difference type detection method for coating in underground oil casing |
| CN106092871B (en) * | 2016-07-22 | 2019-04-19 | 天津大学 | It is a kind of for evaluating the in situ detection apparatus and method of metal food packing jar inner wall corrosion |
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| US20110018543A1 (en) * | 2007-12-06 | 2011-01-27 | Nederlandse Organisatie Voor Toegepast-Natuurweten Schappelijk Onderzoek Tno | Electrochemical cell for eis |
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