CN105043971A - Experiment device for research on corrosion behavior of metal substrate beneath peeling coating - Google Patents
Experiment device for research on corrosion behavior of metal substrate beneath peeling coating Download PDFInfo
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- CN105043971A CN105043971A CN201510381521.0A CN201510381521A CN105043971A CN 105043971 A CN105043971 A CN 105043971A CN 201510381521 A CN201510381521 A CN 201510381521A CN 105043971 A CN105043971 A CN 105043971A
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Abstract
The invention discloses an experiment device for research on the corrosion behavior of a metal substrate beneath a peeling coating. The experiment device comprises an epoxy resin plate, an organic glass plate, a plurality of work electrode, at least one auxiliary anode, a plurality of reference electrodes, a plurality of needle tubes, a plurality of lead wires, a plurality of bolts, a steel pipe, gaskets, a voltmeter, a constant potential rectifier, an electrochemical tester, and a stray current source. In the provided equipment, the organic glass plate and epoxy resin plate are used to simulate the medium environment beneath a peeling coating, wherein a gap exists between the organic glass plate and the epoxy resin plate, and the gap thickness can be controlled by adjusting the number of gaskets; multiple work electrodes are arranged on the damaged parts and different positions beneath the peeling coating to simulate the metal substrates on the damage parts and positions beneath the peeling coating. Only one experiment device can carry out many indoor experiments on the corrosion behavior of metal substrate under factors of stray currents, gap thickness, and cathode protection potential, and the like.
Description
Technical field
The invention belongs to corrosive pipeline and protection detection field, a kind of experimental provision for studying metallic matrix corrosion behavior under release coating of particularly suitable.
Background technology
In recent years along with the development of China's oil and energy industry, embedded underground a large amount of oil transportations and rock gas metallic conduit, wherein long distance pipeline is up to more than 20,000 kilometers, and urban pipe network is countless especially.Due to the buried mode of the many employings of method for paving of these pipelines current, therefore it is inevitably subject to mechanical force, stress damage in installation and use procedure, thus cause the defects such as pin hole, foaming, tilting appear in its outer anticorrosive coating, result forms stripping area between damaged coatings and substrate, electrolyte like this in use procedure thereafter in the soil liquid just can be deep into stripping area, reacts just can be formed and the distinct stagnant liquid of body soil liquid character through long term physical effect and chemical/electrochemical.The outer anticorrosive coating of buried pipeline is peeled off and seriously can be reduced pipe line steel serviceable life on the one hand, causes heavy economic losses, can increase the probability that catastrophic failure has an accident on the other hand, thus the serious threat person and production safety.Therefore, strengthen the corrosion research of pipeline under release coating, the safe operation of these pipelines in soil environment and long service are had great importance.
Due to the diversity of coating compromise state and the complicacy of respective environment, under erosion shield, the corrosion research of metallic conduit is still a difficult point, mainly concentrated on generation and the development of coating impaired place pipeline crevice corrosion in recent years, comprise influence factor, producing and developing mechanism, sensitivity tests evaluation and research method, protection and control measure, glucose current equation distribution under cathodic protection effect in gap, cathodic protection prevents the mechanism of crevice corrosion, and the aspect such as the mathematical model of crevice corrosion and cathodic protection thereof, wherein shop experiment research is as a kind of simple and convenient data acquiring mode, obtain in this research field and apply comparatively widely.At present, America and Europe, establish flat-type test unit and ring test device respectively, carry out experimental study with regard to metallic conduit axial and circumferential corrosive property in soil and water environment; And domesticly mainly launch experimental study by means of flat-type test unit for water environment, but the shortcoming of such device makes comparatively complicated, is not suitable for revision test.For this reason, extensively investigating on the basis of domestic and international correlation test device, be necessary to manufacture and design the test unit that a set of manufacture is simple, be convenient to revision test, to simulate the true environment that corrosion occurs metal under release coating, and then gain insight into metal corrosion behavior in the present context.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide and a kind ofly build the experimental provision for studying metallic matrix corrosion behavior under release coating that is easy, that originally complicated experimental facilities can be simplified, be convenient to repeat to test, save experimental work amount.
In order to achieve the above object, provided by the inventionly epoxy resin board, poly (methyl methacrylate) plate, organic glass box, multiple working electrode, at least one impressed current anode, multiple contrast electrode, multiple needle tubing, multiple conducting wires, multiple bolt, steel pipe, pad, voltage table, potentiostat, electrochemical test and stray current source is comprised for studying the experimental provision of metallic matrix corrosion behavior under release coating; Wherein epoxy resin board is horizontally disposed with; Pad is loop configuration, is arranged on the marginal surface position of epoxy resin board; Poly (methyl methacrylate) plate is arranged on pad, it is formed with at least one damaged mouth, and utilizes multiple bolt epoxy resin board, pad and poly (methyl methacrylate) plate to be combined into one, and forms gap space thus between this three; Organic glass box is cuboid structure, and be arranged on damaged mouth top on poly (methyl methacrylate) plate, Simulated Soil Solution is equipped with in inside, bottom surface is formed with the through hole corresponding with above-mentioned damaged mouth, for simulating the interface portion of coating damage mouth and soil environment simultaneously; An impressed current anode and a contrast electrode is provided with above each damaged mouth in organic glass box; Multiple working electrode is separately positioned on the inner diverse location place of each damaged mouth and gap space, for simulating the metallic conduit situation at distance coating damage mouth different distance place under coating damage mouth and release coating; Poly (methyl methacrylate) plate above each working electrode is all arranged one using needle tubing as the contrast electrode of salt bridge, the syringe needle of needle tubing extends in gap space through after poly (methyl methacrylate) plate; The negative pole of potentiostat is connected with one end of all working electrode by a wire, and positive pole is connected with impressed current anode by another root wire; One end of voltage table is connected with a contrast electrode by a wire, and the other end is connected with a working electrode to be measured by a wire; The two ends of electrochemical test connect with an impressed current anode and a contrast electrode respectively by a wire; Each working electrode is connected on the steel pipe with anticorrosive coat respectively by a wire; The two ends in stray current source are connected with steel pipe two ends respectively by a wire.
Described contrast electrode is the saturated calomel electrode (SCE) of band salt bridge.
Described impressed current anode is platinum electrode or carbon electrode.
The quantity of described pad is one or more, for regulating the thickness of gap space.
Described multiple working electrodes are evenly arranged in gap space.
Under research release coating provided by the invention, the experimental provision of metallic matrix corrosion behavior is with the media environment under the poly (methyl methacrylate) plate of certain gap space and epoxy resin board simulation release coating, gap thickness is controlled by regulating the number of pad, under breakage and release coating, several working electrodes are installed at different distance place, for simulating the metallic matrix at different distance place under coating damage place and release coating; With potentiostat, cathodic protection is applied to device, and measure the current potential of breakage and gap space inner different depth place working electrode successively with voltage table; With stray current source, stray current interference is applied to pipeline, and then stray current is applied to the working electrode be connected with pipeline in gap space disturb; So only with a set of experimental provision just can under many group release coatings be carried out in indoor the factor such as stray current, gap thickness and cathodic protection potential to the experimental study of metallic matrix corrosion behavior.
Accompanying drawing explanation
Fig. 1 is the experimental provision front elevation for studying metallic matrix corrosion behavior under release coating provided by the invention.
Fig. 2 is the experimental provision vertical view for studying metallic matrix corrosion behavior under release coating provided by the invention.
Embodiment
Be described in detail for studying the experimental provision of metallic matrix corrosion behavior under release coating to provided by the invention below in conjunction with the drawings and specific embodiments.
As shown in Figure 1 and Figure 2, provided by the inventionly epoxy resin board 13, poly (methyl methacrylate) plate 12, organic glass box 1, multiple working electrode 8, at least one impressed current anode 4, multiple contrast electrode 3, multiple needle tubing 21, multiple conducting wires 5, multiple bolt 7, steel pipe 19, pad 15, voltage table 9, potentiostat 10, electrochemical test 11 and stray current source 20 is comprised for studying the experimental provision of metallic matrix corrosion behavior under release coating; Wherein epoxy resin board 13 is horizontally disposed with; Pad 15 is loop configuration, is arranged on the marginal surface position of epoxy resin board 13; Poly (methyl methacrylate) plate 12 is arranged on pad 15, it is formed with at least one damaged mouth 14, and utilizes multiple bolt 7 epoxy resin board 13, pad 15 and poly (methyl methacrylate) plate 12 to be combined into one, and forms gap space 6 thus between this three; Organic glass box 1 is cuboid structure, be arranged on damaged mouth 14 top on poly (methyl methacrylate) plate 12, Simulated Soil Solution 2 is equipped with in inside, bottom surface is formed with the through hole corresponding with above-mentioned damaged mouth 14, for simulating the interface portion of coating damage mouth and soil environment simultaneously; An impressed current anode 4 and a contrast electrode 3 is provided with above each damaged mouth 14 in organic glass box 1; Multiple working electrode 8 is separately positioned on each damaged mouth 14 and the inner diverse location place of gap space 6, for simulating the metallic conduit situation at distance coating damage mouth different distance place under coating damage mouth and release coating; Poly (methyl methacrylate) plate 12 above each working electrode 8 is all arranged a contrast electrode 3 using needle tubing 21 as salt bridge, the syringe needle of needle tubing 21 extends in gap space 6 through after poly (methyl methacrylate) plate 12; The negative pole of potentiostat 10 is connected with one end of all working electrode 8 by a wire 5, and positive pole is connected with impressed current anode 4 by another root wire 5; One end of voltage table 9 is connected with a contrast electrode 3 by a wire 5, and the other end is connected with a working electrode 8 to be measured by a wire 5; The two ends of electrochemical test 11 connect with an impressed current anode 4 and a contrast electrode 3 respectively by a wire 5; Each working electrode 8 is connected on the steel pipe 19 with anticorrosive coat 18 respectively by a wire 5; The two ends in stray current source 20 are connected with steel pipe 19 two ends respectively by a wire 5.
Described contrast electrode 3 is the saturated calomel electrode (SCE) of band salt bridge.
Described impressed current anode 4 is platinum electrode or carbon electrode.
The quantity of described pad 15 is one or more, for regulating the thickness of gap space 6.
Described multiple working electrodes 8 are evenly arranged in gap space 6.
Now be described below provided by the invention for studying the experimental provision using method of metallic matrix corrosion behavior under release coating:
1. when needing to carry out the experimental study that cathodic protection potential under release coating affects metallic matrix corrosion behavior, first get appropriate Simulated Soil Solution 2 and pour in organic glass box 1, at this moment this solution is by entering in gap space 6 by the through hole on organic glass box 1 bottom surface through damaged mouth 14, then auxiliary electrode 4 and contrast electrode 3 is put into organic glass case 1; The negative pole wire 5 of potentiostat 10 is connect the row working electrode 8 in all working electrode 8; positive pole connects the auxiliary electrode 4 at damaged mouth 14 place corresponding with this row working electrode 8; the working electrode 8 of permutation is made to be in cathode protecting state; then different cathodic protection potentials is applied with the working electrode 8 of potentiostat 10 to these row; and the current potential of the working electrode 8 apart from damaged mouth 14 different distance place is measured with voltage table 9; then the experiment of next column is carried out, to draw its Changing Pattern.
2. when needing to carry out the experimental study that stray current under release coating affects metallic matrix corrosion behavior, by in the access device of stray current source 20, namely draw two wires 5 to be directly connected from stray current source 20 with steel pipe 19 two ends, then stray current is applied to disturb, and by the size that stray current measured apart from damaged mouth 14 different distance suffered by working electrode 8 by voltage table 9; By in electrochemical test 11 access device, adopt three-electrode system, namely apart from the working electrode 8 at damaged mouth 14 different distance place, the saturated calomel electrode (SCE) of band salt bridge is contrast electrode 3, platinum electrode or carbon-point are auxiliary electrode 4, can carry out above-mentioned experiment.
3., when needing to carry out the experimental study that gap thickness under release coating affects metallic matrix corrosion behavior, the method increasing pad 15 number successively can be utilized to repeat above-mentioned experiment, and analysis design mothod data, draw corrosion regularity.
Claims (5)
1. one kind for studying the experimental provision of metallic matrix corrosion behavior under release coating, it is characterized in that: it comprises epoxy resin board (13), poly (methyl methacrylate) plate (12), organic glass box (1), multiple working electrode (8), at least one impressed current anode (4), multiple contrast electrode (3), multiple needle tubing (21), multiple conducting wires (5), multiple bolt (7), steel pipe (19), pad (15), voltage table (9), potentiostat (10), electrochemical test (11) and stray current source (20), wherein epoxy resin board (13) is horizontally disposed with, pad (15) is loop configuration, is arranged on the marginal surface position of epoxy resin board (13), poly (methyl methacrylate) plate (12) is arranged on pad (15), it is formed with at least one damaged mouth (14), and utilize multiple bolt (7) epoxy resin board (13), pad (15) and poly (methyl methacrylate) plate (12) to be combined into one, between this three, form gap space (6) thus, organic glass box (1) is cuboid structure, be arranged on upper damaged mouth (14) top of poly (methyl methacrylate) plate (12), Simulated Soil Solution (2) is equipped with in inside, bottom surface is formed with the through hole corresponding with above-mentioned damaged mouth (14), for simulating the interface portion of coating damage mouth and soil environment simultaneously, in organic glass box (1), each damaged mouth (14) top is provided with an impressed current anode (4) and a contrast electrode (3), multiple working electrode (8) is separately positioned on each damaged mouth (14) and the inner diverse location place of gap space (6), for simulating the metallic conduit situation at distance coating damage mouth different distance place under coating damage mouth and release coating, the poly (methyl methacrylate) plate (12) of each working electrode (8) top all arranges a contrast electrode (3) using needle tubing (21) as salt bridge, and the syringe needle of needle tubing (21) extends in gap space (6) through after poly (methyl methacrylate) plate (12), the negative pole of potentiostat (10) is connected with one end of all working electrode (8) by a wire (5), and positive pole is connected with impressed current anode (4) by another root wire (5), one end of voltage table (9) is connected with a contrast electrode (3) by a wire (5), and the other end is connected with a working electrode to be measured (8) by a wire (5), the two ends of electrochemical test (11) connect with an impressed current anode (4) and a contrast electrode (3) respectively by a wire (5), each working electrode (8) is connected on the steel pipe (19) with anticorrosive coat (18) respectively by a wire (5), the two ends in stray current source (20) are connected with steel pipe (19) two ends respectively by a wire (5).
2. the experimental provision for studying metallic matrix corrosion behavior under release coating according to claim 1, is characterized in that: described contrast electrode (3) is the saturated calomel electrode of band salt bridge.
3. the experimental provision for studying metallic matrix corrosion behavior under release coating according to claim 1, is characterized in that: described impressed current anode (4) is platinum electrode or carbon electrode.
4. the experimental provision for studying metallic matrix corrosion behavior under release coating according to claim 1, is characterized in that: the quantity of described pad (15) is one or more, for regulating the thickness of gap space (6).
5. the experimental provision for studying metallic matrix corrosion behavior under release coating according to claim 1, is characterized in that: described multiple working electrodes (8) are evenly arranged in gap space (6).
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108303368A (en) * | 2018-03-05 | 2018-07-20 | 青岛大学 | A kind of mechanicalness auxiliary slit corrosion device for studying metal material |
| CN108562534A (en) * | 2017-12-29 | 2018-09-21 | 浙江大学 | A kind of reinforcing bar non-uniform corrosion auxiliary electrode positioning device |
| CN109142202A (en) * | 2018-08-03 | 2019-01-04 | 苏州热工研究院有限公司 | A kind of gap environmental stress corrosion susceptibility high throughput evaluating apparatus and method |
| CN109208009A (en) * | 2018-09-26 | 2019-01-15 | 江苏清源管道技术有限公司 | A kind of pipeline corrosion protection system of metro area |
| CN110031391A (en) * | 2019-04-24 | 2019-07-19 | 夸克能源工程实验室(深圳)有限公司 | A kind of wedge-shaped crevice corrosion device |
| CN110039215A (en) * | 2019-05-27 | 2019-07-23 | 中国核动力研究设计院 | The preparation method and welding structure of a kind of precision gap sample |
| CN110208177A (en) * | 2019-06-21 | 2019-09-06 | 中国特种设备检测研究院 | Electrochemical experimental device |
| CN110274870A (en) * | 2019-08-06 | 2019-09-24 | 四川轻化工大学 | Controllable gap corrosion test device and method |
| CN110849799A (en) * | 2019-11-07 | 2020-02-28 | 常州大学 | Device for researching interference of stray current on buried pipeline cathode protection system |
| CN110887782A (en) * | 2019-12-04 | 2020-03-17 | 西安科技大学 | Working electrode for corrosion detection and preparation method thereof |
| CN111398151A (en) * | 2019-01-02 | 2020-07-10 | 中国石油化工股份有限公司 | Interference corrosion test device for pipeline by alternating stray current |
| CN112697686A (en) * | 2020-12-04 | 2021-04-23 | 中国科学院金属研究所 | Test device and method for rapidly evaluating titanium alloy gap corrosion |
| CN113433057A (en) * | 2021-06-02 | 2021-09-24 | 中国矿业大学 | Buried metal pipeline stray current corrosion rate prediction device and method |
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Cited By (20)
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| CN108562534A (en) * | 2017-12-29 | 2018-09-21 | 浙江大学 | A kind of reinforcing bar non-uniform corrosion auxiliary electrode positioning device |
| CN108562534B (en) * | 2017-12-29 | 2023-09-05 | 浙江大学 | Reinforcing bar non-uniform corrosion auxiliary electrode positioner |
| CN108303368A (en) * | 2018-03-05 | 2018-07-20 | 青岛大学 | A kind of mechanicalness auxiliary slit corrosion device for studying metal material |
| CN108303368B (en) * | 2018-03-05 | 2023-08-08 | 青岛大学 | Mechanical auxiliary crevice corrosion device for researching metal material |
| CN109142202A (en) * | 2018-08-03 | 2019-01-04 | 苏州热工研究院有限公司 | A kind of gap environmental stress corrosion susceptibility high throughput evaluating apparatus and method |
| CN109142202B (en) * | 2018-08-03 | 2020-11-10 | 苏州热工研究院有限公司 | High-flux evaluation device and method for stress corrosion sensitivity of slit environment |
| CN109208009A (en) * | 2018-09-26 | 2019-01-15 | 江苏清源管道技术有限公司 | A kind of pipeline corrosion protection system of metro area |
| CN111398151A (en) * | 2019-01-02 | 2020-07-10 | 中国石油化工股份有限公司 | Interference corrosion test device for pipeline by alternating stray current |
| CN110031391A (en) * | 2019-04-24 | 2019-07-19 | 夸克能源工程实验室(深圳)有限公司 | A kind of wedge-shaped crevice corrosion device |
| CN110039215A (en) * | 2019-05-27 | 2019-07-23 | 中国核动力研究设计院 | The preparation method and welding structure of a kind of precision gap sample |
| CN110039215B (en) * | 2019-05-27 | 2021-03-30 | 中国核动力研究设计院 | Preparation method and welding structure of precision gap sample |
| CN110208177B (en) * | 2019-06-21 | 2021-06-11 | 中国特种设备检测研究院 | Electrochemical experimental device |
| CN110208177A (en) * | 2019-06-21 | 2019-09-06 | 中国特种设备检测研究院 | Electrochemical experimental device |
| CN110274870A (en) * | 2019-08-06 | 2019-09-24 | 四川轻化工大学 | Controllable gap corrosion test device and method |
| CN110274870B (en) * | 2019-08-06 | 2024-07-02 | 四川轻化工大学 | Controllable crevice corrosion test device and method |
| CN110849799A (en) * | 2019-11-07 | 2020-02-28 | 常州大学 | Device for researching interference of stray current on buried pipeline cathode protection system |
| CN110849799B (en) * | 2019-11-07 | 2022-05-13 | 常州大学 | Device for researching interference of stray current on buried pipeline cathode protection system |
| CN110887782A (en) * | 2019-12-04 | 2020-03-17 | 西安科技大学 | Working electrode for corrosion detection and preparation method thereof |
| CN112697686A (en) * | 2020-12-04 | 2021-04-23 | 中国科学院金属研究所 | Test device and method for rapidly evaluating titanium alloy gap corrosion |
| CN113433057A (en) * | 2021-06-02 | 2021-09-24 | 中国矿业大学 | Buried metal pipeline stray current corrosion rate prediction device and method |
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