CN111398152B - Interference corrosion test device for pipeline by direct current stray current - Google Patents
Interference corrosion test device for pipeline by direct current stray current Download PDFInfo
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- CN111398152B CN111398152B CN201910000300.2A CN201910000300A CN111398152B CN 111398152 B CN111398152 B CN 111398152B CN 201910000300 A CN201910000300 A CN 201910000300A CN 111398152 B CN111398152 B CN 111398152B
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- 238000005260 corrosion Methods 0.000 title claims abstract description 39
- 230000007797 corrosion Effects 0.000 title claims abstract description 37
- 238000012360 testing method Methods 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 45
- 239000010959 steel Substances 0.000 claims abstract description 45
- 238000004088 simulation Methods 0.000 claims abstract description 26
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 9
- 230000006378 damage Effects 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 3
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 claims description 3
- 238000002848 electrochemical method Methods 0.000 claims description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 3
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 3
- 238000003980 solgel method Methods 0.000 claims description 3
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 2
- 229920005372 Plexiglas® Polymers 0.000 claims description 2
- 230000033116 oxidation-reduction process Effects 0.000 claims description 2
- -1 Polytetrafluoroethylene Polymers 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 19
- 230000006399 behavior Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 238000004210 cathodic protection Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006056 electrooxidation reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses an interference corrosion test device for a pipeline by direct-current stray current, which comprises an environment simulation unit and a circuit unit, wherein the environment simulation unit is used for simulating the interference corrosion of the direct-current stray current to the pipeline; pipeline steel and an insulating layer are arranged in the shell of the environment simulation unit; a spacing gap is arranged between the pipeline steel and the insulating layer; the insulating layer is provided with a through hole for communicating the solution area and the interval gap; the environment simulation unit also comprises a stress applying component and a stress collecting component; the circuit unit comprises an interference simulation sub-circuit and a measurement sub-circuit; the interference simulation sub-circuit comprises a direct current power supply and an auxiliary electrode; the auxiliary electrode is used for acquiring experimental data; the measuring sub-circuit comprises a reference electrode, a voltmeter and a plurality of microelectrodes which are connected in series; the voltmeter is used for respectively acquiring potential data between the microelectrodes and the reference electrode. The invention can monitor the local environment and the corrosion electrochemical behavior of the pipe body at different positions under the direct current interference pipeline steel stripping coating in real time.
Description
Technical Field
The invention relates to the field of petrochemical industry, in particular to a device for testing interference corrosion of direct current stray current on a pipeline.
Background
With the large-scale construction of high-voltage/extra-high-voltage transmission lines and electrified railway systems, buried pipelines are interfered by stray currents, and pipeline corrosion and safety problems caused by the stray currents are also increasingly prominent.
The anti-corrosion layer of the buried pipeline has good insulativity, and stray current entering the pipeline from soil can flow out from defects such as damage and peeling of the anti-corrosion layer of the pipeline after being transmitted for a certain distance, and at the moment, the local corrosion of the current flowing out position can be caused. Corrosion caused by stray current belongs to electrochemical corrosion, and the corrosion caused by the stray current can cause great loss of production materials (such as oil and gas pipelines) and also can cause production loss; therefore, by carrying out interference corrosion test on the pipeline, a certain basis can be provided for evaluating the influence and harm of the stray current on the pipeline.
In the prior art, the related technical scheme of the pipeline corrosion test under direct current interference comprises the following steps: patent for testing corrosion rate of metallic materials by simulating actual industrial environment with direct current stray current: "an experimental apparatus for simulating stray current corrosion in soil (application number: 2013102425139)"; patent for simulating the effect of stress and stray current coupling on the peeling of a pipeline coating: "a system for coating stripping and corrosion test of buried steel pipeline under coupling effect of stress and stray current (application number: 2013103001961)"; patent for realizing the test of electrochemical corrosion behavior of pipeline steel under direct current stray current interference: "electrochemical test System for evaluating corrosion of oil and gas pipelines under DC stray current interference (application number: 2014206230939)".
The inventor finds that at least the following defects exist in the prior art:
the experimental approach obtained in the prior art has not yet obtained comprehensive data of the effect of stray currents on the pipe release coating.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide an interference corrosion test device for a pipeline by direct current stray current, so that the corrosion condition of the pipeline under direct current interference can be measured, and the change of microenvironment in a gap can be monitored in real time.
In order to achieve the above purpose, the invention provides an interference corrosion test device for a pipeline by direct current stray current, which comprises an environment simulation unit and a circuit unit;
the shell of the environment simulation unit comprises a bottom plate and a cover plate; a cavity formed by the shell is internally provided with pipeline steel in contact connection with the bottom plate and an insulating layer in contact connection with the cover plate; a spacer is arranged between the pipeline steel and the insulating layer so as to enable a gap with a preset distance to be kept between the pipeline steel and the insulating layer; the cavity formed by the shell further comprises a solution area, and the insulating layer is provided with a through hole so as to communicate the solution area with the interval gap; the environment simulation unit further comprises a stress applying component for applying stress to the pipeline steel, and a stress acquisition component for acquiring stress data to which the pipeline steel is subjected;
the circuit unit comprises an interference simulation sub-circuit and a measurement sub-circuit; the interference simulation sub-circuit for generating direct current stray current comprises a direct current power supply and an auxiliary electrode; the auxiliary electrode is arranged in the solution area and is connected with the direct current power supply circuit; the measuring sub-circuit for acquiring experimental data comprises a reference electrode, a voltmeter and a microelectrode group which are connected in series; the reference electrode is arranged at the through hole; the microelectrode group comprises a plurality of potential microelectrodes and is used for acquiring experimental data in the interval gap through a plurality of microelectrode jacks arranged on the cover plate and the insulating layer, and the microelectrode jacks are respectively arranged at positions with different distances from the through hole; the voltmeter is used for respectively acquiring potential difference data between the plurality of potential microelectrodes and the reference electrode.
Further, in the above technical solution, the stress applying component includes a fixing frame provided with a fixing plate; the fixing frame is arranged below the shell, and the pipeline steel extending out of the shell passes through the through holes in the fixing plate; and a loading bolt for stretching the pipeline steel is arranged at one end of the pipeline steel penetrating through the through hole.
Further, in the above technical solution, the insulating layer includes plexiglass.
Further, in the above technical scheme, the microelectrode set further comprises a pH microelectrode and/or a chloride ion concentration microelectrode.
Further, in the above technical solution, the thickness of the spacer is adjustable.
Further, in the above technical solution, the number of the microelectrode jacks is three.
Further, in the above technical scheme, the distances between the plurality of microelectrode jacks are equidistant.
Further, in the above technical scheme, the pH microelectrode comprises a CF/WO-pH microelectrode prepared by a sol-gel method; the chloride ion concentration microelectrode comprises an Ag/AgCl microelectrode prepared by a silver wire electrochemical method; the potential microelectrode comprises a potential microelectrode prepared by platinum wire type oxidation reduction.
In the above technical scheme, the gasket is made of PTFE.
Further, in the above technical solution, the reference electrode includes a saturated calomel electrode SCE.
Advantageous effects
According to the interference corrosion test device for the pipeline by the direct-current stray current, provided by the invention, the state of the pipeline after the insulating coating is stripped and damaged is simulated by a mode of constructing a spacing gap between the insulating layer and the pipeline steel by arranging the gasket, and different stress conditions of the pipeline steel are simulated by the stress applying component; then simulating the interference environment of the direct current stray current on the pipeline after the insulating coating is stripped by arranging an interference simulation sub-circuit; in addition, in the invention, a plurality of microelectrode jacks penetrating into the interval gaps are arranged on the cover plate and the insulating layer; through measuring the sub-circuit, can obtain experimental data such as potential difference, pH value, chloride ion concentration between through-hole and each microelectrode on the insulating layer respectively.
Because the distance between each microelectrode and the through hole simulating the damaged position is different, the invention can obtain experimental data of different positions of the insulating layer, so that the influence degree and the influence mode of different positions in the gap for stripping the insulating layer of the pipeline after being interfered by direct current stray current can be simulated. That is, the invention can monitor local environments and pipe corrosion electrochemical behaviors at different positions under the direct current interference pipeline steel stripping coating in real time, thereby providing more abundant and effective experimental data for researching the effects of parameters such as cathodic protection, external soil environment, direct current interference, strength, frequency, damage point size and the like on the pipeline steel corrosion behaviors under the stripping coating.
The foregoing description is only an overview of the present invention, and it is to be understood that it is intended to provide a more clear understanding of the technical means of the present invention and to enable the technical means to be carried out in accordance with the contents of the specification, while at the same time providing a more complete understanding of the above and other objects, features and advantages of the present invention, and one or more preferred embodiments thereof are set forth below, together with the detailed description given below, along with the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a device for testing the interference corrosion of DC stray current to a pipeline according to the invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or other components.
Spatially relative terms, such as "below," "beneath," "lower," "above," "upper," and the like, may be used herein for ease of description to describe one element's or feature's relationship to another element's or feature's in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the article in use or operation in addition to the orientation depicted in the figures. For example, if the article in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" may encompass both a direction of below and a direction of above. The article may have other orientations (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terms "first," "second," and the like herein are used for distinguishing between two different elements or regions and are not intended to limit a particular position or relative relationship. In other words, in some embodiments, the terms "first," "second," etc. may also be interchanged with one another.
As shown in fig. 1, according to an embodiment of the present invention, an apparatus for testing interference corrosion of direct current stray current to a pipeline includes an environmental simulation unit and a circuit unit;
the housing of the environmental simulation unit comprises a bottom plate 01 and a cover plate 02; a cavity formed by the shell is provided with pipeline steel 03 in contact connection with the bottom plate 01 and an insulating layer 04 in contact connection with the cover plate 02; a spacer 05 is arranged between the pipeline steel 03 and the insulating layer 04 so as to maintain a gap 06 with a preset distance between the pipeline steel 03 and the insulating layer 04; the cavity formed by the shell also comprises a solution area 07, and the insulating layer 04 is provided with a through hole 08 for communicating the solution area 07 with the interval gap 06; the environment simulation unit further comprises a stress applying component for applying stress to the pipeline steel 03 and a stress acquisition component for acquiring stress data to which the pipeline steel 03 is subjected;
the circuit unit comprises an interference simulation sub-circuit and a measurement sub-circuit; the interference simulation sub-circuit for generating dc stray current comprises a dc power supply 09 and an auxiliary electrode 10; the auxiliary electrode 10 is arranged in the solution area 07 and is in circuit connection with the direct current power supply 09; the measuring sub-circuit for acquiring experimental data comprises a reference electrode 11, a voltmeter 12 and a microelectrode set 13 connected in series; the reference electrode 11 is arranged at the through hole 08; the microelectrode group 13 comprises a plurality of potential microelectrodes, and is used for acquiring experimental data in the interval gap 06 through a plurality of microelectrode jacks arranged on the cover plate 02 and the insulating layer 04, wherein the microelectrode jacks are respectively arranged at positions with different distances from the through hole 08; the voltmeter 12 is used for respectively acquiring potential difference data between the plurality of potential microelectrodes and the reference.
In the embodiment of the invention, the environment simulation unit refers to a part for simulating the state of the stripped and damaged insulating coating of the pipeline, and the shell of the environment simulation unit is composed of a bottom plate 01 and a cover plate 02, so that a cavity is formed; the cavity comprises two parts, one part is used for arranging pipeline steel 03, a gasket 05 and an insulating layer 04; another part is used to constitute the solution zone 07; in addition, a stress applying component is arranged under the shell; in practical applications, the stress applying component may include a fixing frame, which is formed by a base 21 and a fixing plate 22; in this way, the stressing of the pipeline steel 03 can be achieved by stretching the pipeline steel 03 by the rotating load bolts 23 after the pipeline steel 03 extending out of the housing passes through the perforations in the fixing plate 22; in addition, in order to collect stress data of the pipeline steel 03 applied with stress in real time, a stress collecting part 24 is also provided; in particular, the stress-collecting member may be a load-measuring sensor; thus, by acquiring the data collected by the sensor, the stress data of the pipeline steel 03 can be measured.
The pipeline steel 03 is used for simulating the pipe wall of an oil gas pipeline, and the insulating layer 04 is used for simulating the insulating coating of the pipeline; the gasket 05 is arranged between the pipeline steel 03 and the insulating layer 04, so that a gap 06 with a preset distance is kept between the pipeline steel 03 and the insulating layer 04, and a gap formed between the gasket and the pipe wall of the oil gas pipeline after the insulating coating of the pipeline is stripped is simulated; in practical applications, the material of the gasket 05 in the embodiment of the present invention may be PTFE; the solution area 07 simulates different environments of the oil gas pipeline in place by the components of different solutions, and the insulating layer 04 is also provided with a through hole 08 to simulate the damage position of the pipeline after the insulating coating is stripped.
The circuit unit in the embodiment of the invention can simulate direct current stray current received by the oil gas pipeline by interfering the simulation sub-circuit on one hand, and can acquire experimental data by measuring the sub-circuit on the other hand; the interference analog sub-circuit can generate direct current stray current in the solution area 07 through the direct current power supply 09 and the auxiliary electrode 10 can generate direct current stray current, and the direct current stray current can be transmitted into the interval gap 06 through the through hole 08;
the reference electrode 11, the voltmeter 12 and the microelectrode group 13 of the measuring sub-circuit are connected in series and are used for measuring potential data from the through hole 08 to each microelectrode in the microelectrode group 13; the microelectrode group 13 in the embodiment of the invention can comprise a plurality of potential microelectrodes (for example, 3 microelectrodes) which are respectively arranged at positions at different distances from the through hole 08, so that different positions of the pipeline stripping coating are simulated, namely, the real-time monitoring of local environments and the corrosion electrochemical behaviors of the pipe body at different positions under the direct current interference pipeline steel stripping coating can be realized by respectively acquiring the potential data of the different microelectrodes. Wherein the reference electrode 11 may comprise a Saturated Calomel Electrode (SCE);
in practical applications, the insulating layer in the embodiments of the present invention may be organic glass; in order to obtain experimental data such as pH and chloride concentration in the gap 06, the microelectrodes in the microelectrode set 13 in the embodiment of the present invention may further include multiple microelectrodes such as pH microelectrode and chloride concentration microelectrode; specifically, the pH microelectrode can be a CF/WO-pH microelectrode prepared by a sol-gel method; the chloride ion concentration microelectrode can be an Ag/AgCl microelectrode prepared by a silver wire electrochemical method; the potential microelectrode may be a potential microelectrode prepared by platinum wire type redox.
Furthermore, in order to facilitate calculation and determination of the change trend of the influence degree of the local environment and the pipe corrosion electrochemical behavior at different positions under the direct current interference pipeline steel stripping coating, the distances among the microelectrode jacks in the embodiment of the invention can be set to be equidistant.
In summary, in the embodiment of the invention, the spacer is provided to construct the gap between the insulating layer and the pipeline steel to simulate the peeled and damaged state of the insulating coating of the pipeline, and the stress application component is used to simulate the pipeline steel to receive different stress conditions; then simulating the interference environment of the direct current stray current on the pipeline after the insulating coating is stripped by arranging an interference simulation sub-circuit; in addition, in the invention, a plurality of microelectrode jacks penetrating into the interval gaps are arranged on the cover plate and the insulating layer; through measuring the sub-circuit, can obtain experimental data such as potential difference, pH value, chloride ion concentration between through-hole and each microelectrode on the insulating layer respectively.
Because the distance between each microelectrode and the through hole simulating the damaged position is different, the invention can obtain experimental data of different positions of the insulating layer, so that the influence degree and the influence mode of different positions in the gap for stripping the insulating layer of the pipeline after being interfered by direct current stray current can be simulated. That is, the invention can monitor local environments and pipe corrosion electrochemical behaviors at different positions under the direct current interference pipeline steel stripping coating in real time, thereby providing more abundant and effective experimental data for researching the effects of parameters such as cathodic protection, external soil environment, direct current interference, strength, frequency, damage point size and the like on the pipeline steel corrosion behaviors under the stripping coating.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. Any simple modifications, equivalent variations and modifications of the above-described exemplary embodiments should fall within the scope of the present invention.
Claims (9)
1. The device for testing the interference corrosion of the direct-current stray current to the pipeline is characterized by comprising an environment simulation unit and a circuit unit;
the shell of the environment simulation unit comprises a bottom plate and a cover plate; a cavity formed by the shell is internally provided with pipeline steel in contact connection with the bottom plate and an insulating layer in contact connection with the cover plate; a spacer is arranged between the pipeline steel and the insulating layer so as to enable a gap with a preset distance to be kept between the pipeline steel and the insulating layer; the cavity formed by the shell further comprises a solution area, and the insulating layer is provided with a through hole so as to communicate the solution area with the interval gap; the environment simulation unit further comprises a stress applying component for applying stress to the pipeline steel, and a stress acquisition component for acquiring stress data to which the pipeline steel is subjected; the through holes are used for simulating the damage positions of the pipeline after the insulating coatings are stripped;
the circuit unit comprises an interference simulation sub-circuit and a measurement sub-circuit; the interference simulation sub-circuit for generating direct current stray current comprises a direct current power supply and an auxiliary electrode; the auxiliary electrode is arranged in the solution area and is connected with the direct current power supply circuit; the measuring sub-circuit for acquiring experimental data comprises a reference electrode, a voltmeter and a microelectrode group which are connected in series; the reference electrode is arranged at the through hole; the microelectrode group comprises a plurality of potential microelectrodes and is used for acquiring experimental data in the interval gap through a plurality of microelectrode jacks arranged on the cover plate and the insulating layer, and the microelectrode jacks are respectively arranged at positions with different distances from the through hole; the voltmeter is used for respectively acquiring potential difference data between the plurality of potential microelectrodes and the reference electrode;
the stress applying component comprises a fixing frame provided with a fixing plate; the fixing frame is arranged below the shell, and the pipeline steel extending out of the shell passes through the through holes in the fixing plate; and a loading bolt for stretching the pipeline steel is arranged at one end of the pipeline steel penetrating through the through hole.
2. The device for testing the interference corrosion of direct current stray current on a pipeline according to claim 1, wherein the device comprises a main body,
the insulating layer comprises plexiglass.
3. The device for testing the interference corrosion of direct current stray current on a pipeline according to claim 1, wherein the device comprises a main body,
the microelectrode group also comprises a pH value microelectrode and/or a chloride ion concentration microelectrode.
4. The device for testing the interference corrosion of direct current stray current on a pipeline according to claim 1, wherein the device comprises a main body,
the thickness of the gasket is adjustable.
5. The device for testing the interference corrosion of direct current stray current on a pipeline according to claim 1, wherein the device comprises a main body,
the number of the microelectrode jacks is three.
6. The apparatus for testing the corrosion of a pipeline by the interference of direct current stray current according to claim 1, further comprising:
the distance between the microelectrode jacks is equal.
7. A DC stray current versus pipe interference corrosion test apparatus according to claim 3, wherein,
the pH microelectrode comprises a CF/WO-pH microelectrode prepared by a sol-gel method; the chloride ion concentration microelectrode comprises an Ag/AgCl microelectrode prepared by a silver wire electrochemical method; the potential microelectrode comprises a potential microelectrode prepared by platinum wire type oxidation reduction.
8. The device for testing the interference corrosion of direct current stray current on a pipeline according to claim 1, wherein the device comprises a main body,
the gasket is made of Polytetrafluoroethylene (PTFE).
9. The device for testing the interference corrosion of direct current stray current on a pipeline according to claim 1, wherein the device comprises a main body,
the reference electrode comprises a saturated calomel electrode SCE.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910000300.2A CN111398152B (en) | 2019-01-02 | 2019-01-02 | Interference corrosion test device for pipeline by direct current stray current |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910000300.2A CN111398152B (en) | 2019-01-02 | 2019-01-02 | Interference corrosion test device for pipeline by direct current stray current |
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| CN111398152A CN111398152A (en) | 2020-07-10 |
| CN111398152B true CN111398152B (en) | 2024-01-02 |
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| CN114839233B (en) * | 2021-02-01 | 2024-03-29 | 中国石油化工股份有限公司 | Test pipeline system and method for simulating flow and corrosion of large pipeline |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103344547A (en) * | 2013-06-19 | 2013-10-09 | 国家电网公司 | Experiment device for simulation of stray current corrosion in soil |
| CN103344548A (en) * | 2013-07-13 | 2013-10-09 | 北京工业大学 | System for testing stray current corrosion of buried steel pipeline under function of tensile stress |
| CN103630480A (en) * | 2012-08-23 | 2014-03-12 | 中国科学院金属研究所 | Corrosion testing device for metal inside gaps under stripped coatings |
-
2019
- 2019-01-02 CN CN201910000300.2A patent/CN111398152B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103630480A (en) * | 2012-08-23 | 2014-03-12 | 中国科学院金属研究所 | Corrosion testing device for metal inside gaps under stripped coatings |
| CN103344547A (en) * | 2013-06-19 | 2013-10-09 | 国家电网公司 | Experiment device for simulation of stray current corrosion in soil |
| CN103344548A (en) * | 2013-07-13 | 2013-10-09 | 北京工业大学 | System for testing stray current corrosion of buried steel pipeline under function of tensile stress |
Non-Patent Citations (1)
| Title |
|---|
| CF/WOx-pH微电极的制备、性能及应用研究;李靖;《陕两科技人学硕士学位论文》;20100531;第21-26页 * |
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