CN113310887A - Electrochemical test device for stress corrosion of buried pipeline steel under simulated acid rain leaching condition - Google Patents
Electrochemical test device for stress corrosion of buried pipeline steel under simulated acid rain leaching condition Download PDFInfo
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- CN113310887A CN113310887A CN202010124384.3A CN202010124384A CN113310887A CN 113310887 A CN113310887 A CN 113310887A CN 202010124384 A CN202010124384 A CN 202010124384A CN 113310887 A CN113310887 A CN 113310887A
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- 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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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/16—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces applied through gearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/38—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by electromagnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/005—Electromagnetic means
Abstract
The invention relates to the field of soil corrosion tests, in particular to an electrochemical test device for stress corrosion of steel of a buried pipeline under a simulated acid rain leaching condition. A test box is arranged in the anaerobic box, a spray head is arranged in the middle of the top of the anaerobic box and is positioned above the test box, and the spray head is respectively connected with the simulated acid rain box and the compressor through pipelines; an air inlet is formed in one side of the top of the anaerobic tank and connected with a high-purity nitrogen cylinder through a pipeline, and an air outlet is formed in the side, opposite to the air inlet, of the bottom of the anaerobic tank; the soil is filled in the test box, the pipeline steel electrode and the Pt electrode are embedded in the soil horizontally, the reference electrode is inserted at the top of the soil, one end of the pipeline steel electrode is connected with the fixed part, the other end of the pipeline steel electrode is connected with one side of the movable part, and the other side of the movable part is connected with one end of the weighing sensor through a screw rod. The device is mainly used for simulating the research on the influence of the coupling effect of external stress and microorganisms on the corrosion of the steel of the buried pipeline under the action of acid rain.
Description
Technical Field
The invention relates to the field of soil corrosion tests, in particular to an electrochemical test device for stress corrosion of steel of a buried pipeline under a simulated acid rain leaching condition.
Background
Since 1965, pipeline cracking accidents have occurred in the united states, canada, china, russia and iran. Stress Corrosion Cracking (SCC) is considered to be the most destructive one of the most damaging corrosion processes due to its extremely rapid rate of occurrence and lack of predictive indications. The research on SCC of buried pipeline steel at home and abroad mostly focuses on abiotic factors, but has less research on the biotic factors. Studies have shown that microbial corrosion is one of the most common types of corrosion for buried steel, with SRB corrosion being the most severe. With SRB, the steel corrosion rate is less than 10 microns/year, with SRB, the corrosion rate reaches 200 microns/year, and the local corrosion rate is higher than 700 microns/year. The corrosion of steel is influenced by factors such as material quality, soil environment and mechanics, and also by atmospheric factors. Acid rain continuously settles and permeates into soil, and the soil is acidified, which has a certain influence on the corrosion of steel of the buried pipeline. With the development of society and the progress of mankind, the environment becomes more and more complex, and the corrosion of buried pipelines is not only influenced by a single factor. Therefore, the corrosion rule of the steel of the buried pipeline under the multi-factor coupling action needs to be researched.
Disclosure of Invention
The invention aims to provide an electrochemical testing device for simulating the stress corrosion of steel of a buried pipeline under the acid rain leaching condition, which is mainly used for simulating the research on the corrosion influence of external stress and microorganism coupling action on the steel of the buried pipeline under the acid rain action.
The technical scheme of the invention is as follows:
the utility model provides a bury pipeline steel stress corrosion electrochemical test device under simulation acid rain leaching condition, the device includes: high-purity nitrogen cylinder, simulation acid rain case, compressor, air inlet, proof box, soil, reference electrode, Pt electrode, anaerobism case, pipeline steel electrode, weighing sensor, the concrete structure is as follows:
a test box is arranged in the anaerobic box, a spray head is arranged in the middle of the top of the anaerobic box and is positioned above the test box, and the spray head is respectively connected with the simulated acid rain box and the compressor through pipelines; an air inlet is formed in one side of the top of the anaerobic tank and connected with a high-purity nitrogen cylinder through a pipeline, and an air outlet is formed in the side, opposite to the air inlet, of the bottom of the anaerobic tank;
the soil is filled in the test box, a pipeline steel electrode and a Pt electrode are embedded in the soil horizontally, a reference electrode is inserted at the top of the soil, the pipeline steel electrode is a sheet-shaped tensile sample, one end of the pipeline steel electrode is connected with the fixed part, the other end of the pipeline steel electrode is connected with one side of the movable part, and the other side of the movable part is connected with one end of the weighing sensor through a screw rod.
The electrochemical testing device for the stress corrosion of the steel of the buried pipeline under the condition of simulating the acid rain leaching is characterized in that the other end of the weighing sensor is connected with a worm gear speed reducer, the computer is connected with a stepping motor through a control box, and the output end of the stepping motor is connected with the worm gear speed reducer.
Simulation acid rain drenches and dissolves buried pipeline steel stress corrosion electrochemistry test device under the condition, sets up the filtrating receiver in the anaerobism incasement, the filtrating receiver is located the below of proof box, the filter funnel is installed at proof box bottom center, the below of filtering the funnel is corresponding with the filtrating receiver, the liquid that oozes in the soil is filtered the back through the filter funnel, is received by the filtrating receiver.
The electrochemical testing device for the stress corrosion of the buried pipeline steel under the simulated acid rain leaching condition is characterized in that a constant flow pump is arranged on a pipeline connecting a spray head and a simulated acid rain box.
The electrochemical testing device for steel stress corrosion of the buried pipeline under the simulated acid rain leaching condition is characterized in that a first gas purifying device is arranged on a pipeline with a gas inlet connected with a high-purity nitrogen cylinder.
The electrochemical testing device for the stress corrosion of the steel of the buried pipeline under the simulated acid rain leaching condition is characterized in that a second gas purifying device is arranged on a pipeline connecting a spray head and a compressor.
The electrochemical testing device for stress corrosion of the buried pipeline steel under the simulated acid rain leaching condition is further provided with a WE binding post, a CE binding post and a RE binding post, wherein the WE binding post passes through a shielding lead and is connected with a pipeline steel electrode serving as a working electrode through a screw rod and a movable part, the CE binding post is connected with a Pt electrode serving as an auxiliary electrode through the shielding lead, and the RE binding post is connected with a reference electrode through the shielding lead.
The invention has the advantages and beneficial effects that:
the device can truly simulate the stress corrosion behavior of the steel of the buried pipeline in the acid rain action process, controls the flow rate of the acid rain through the constant flow pump, continuously introduces high-purity nitrogen to ensure anaerobic conditions, and collects leachate through the filter funnel and the filtrate receiver. The device is provided with an electrochemical measurement connector lug for electrochemical measurement, the tension value is measured by using the weighing sensor to simulate different external stresses, the loading and unloading of constant load and circulating load are realized through the control box, and the research on the corrosion rule of pipeline steel in real soil under the action of SRB and stress coupling in the acid rain leaching process can be carried out through the test device.
Drawings
FIG. 1 is a schematic diagram of a buried pipeline steel stress corrosion electrochemical test device under the simulated acid rain leaching effect.
In the figure, 1, a first gas purification device; 2. a high-purity nitrogen cylinder; 3. a constant flow pump; 4. simulating an acid rain box; 5. a compressor; 6. a second gas purification device; 7. an air inlet; 8. a test chamber; 9. soil; 10. a reference electrode; 11. a Pt electrode; 12. an anaerobic tank; 13. filtering the mixture by a funnel; 14. a filtrate receiver; 15. an air outlet; 16. a pipeline steel electrode; 17. a weighing sensor; 18. a WE binding post; 19. a CE binding post; 20. an RE wiring terminal; 21. a worm gear reducer; 22. a stepping motor; 23. a control box; 24. a computer; 25. a spray head; 26. a fixed portion; 27. a movable portion.
Detailed Description
As shown in figure 1, the electrochemical test device for simulating the stress corrosion of the buried pipeline steel under the acid rain leaching condition mainly comprises: the device comprises a first gas purification device 1, a high-purity nitrogen cylinder 2, a constant flow pump 3, a simulated acid rain box 4, a compressor 5, a second gas purification device 6, a gas inlet 7, a test box 8, soil 9, a reference electrode 10, a Pt electrode 11, an anaerobic box 12, a filter funnel 13, a filtrate receiver 14, a gas outlet 15, a pipeline steel electrode 16, a weighing sensor 17, a WE wiring terminal 18, a CE wiring terminal 19, a RE wiring terminal 20, a worm gear speed reducer 21, a stepping motor 22, a control box 23, a computer 24, a spray head 25 and the like, and has the following specific structure:
a test box 8 and a filtrate receiver 14 are arranged in an anaerobic box 12, the filtrate receiver 14 is positioned below the test box 8, a spray head 25 is arranged in the middle of the top of the anaerobic box 12, the spray head 25 is positioned above the test box 8, the spray head 25 is respectively connected with a simulated acid rain box 4 and a compressor 5 through pipelines, a constant flow pump 3 is arranged on a pipeline connecting the spray head 25 and the simulated acid rain box 4, and a second gas purification device 6 is arranged on a pipeline connecting the spray head 25 and the compressor 5; an air inlet 7 is formed in one side of the top of the anaerobic tank 12, the air inlet 7 is connected with a high-purity nitrogen cylinder 2 through a pipeline, and a first gas purification device 1 is arranged on the pipeline; the bottom of the anaerobic box 12 is provided with an air outlet 15 on the side opposite to the air inlet 7.
The test box 8 is filled with soil 9, the center of the bottom of the test box 8 is provided with a filter funnel 13, the lower part of the filter funnel 13 corresponds to a filtrate receiver 14, and liquid seeped from the soil 9 is filtered by the filter funnel 13 and then received by the filtrate receiver 14; pipeline steel electrodes 16 and Pt electrodes 11 are horizontally embedded in soil 9, a reference electrode 10 is inserted into the top of the soil 9, the pipeline steel electrodes 16 are sheet-shaped tensile samples, one end of each pipeline steel electrode 16 is connected with a fixed part 26, the other end of each pipeline steel electrode 16 is connected with one side of a movable part 27, the other side of each movable part 27 is connected with one end of a weighing sensor 17 through a screw, the other end of each weighing sensor 17 is connected with a worm gear reducer 21, a computer 24 is connected with a stepping motor 22 through a control box 23, and the output end of the stepping motor 22 is connected with the worm gear reducer 21.
The WE terminal 18 is connected with a working electrode (such as a tensile stress sample pipeline steel electrode 16) through a shielding lead wire via the screw rod and the movable part 27, the CE terminal 19 is connected with an auxiliary electrode (such as a Pt electrode 11) through a shielding lead wire, and the RE terminal 20 is connected with a reference electrode (such as a saturated KCl calomel electrode) through a shielding lead wire. Thus, in situ electrochemical measurements of tensile stress samples during acid rain leaching were performed through the WE terminal 18, the CE terminal 19, and the RE terminal 20.
The working process of the invention is as follows:
sample loading: the stepping motor 22 drives the worm gear reducer 21 to load the sample (the pipeline steel electrode 16) through the synchronous transmission gear, and simultaneously, the magnitude of the applied tension is measured through the weighing sensor 17 connected to one end of the sample. Tension data measured by the weighing sensor 17 is input into a computer 24, and the computer 24 controls the rotation of the stepping motor 22 through a LabView program and a control box 23, so that the stress of the sample is controlled, and the loading and unloading of the constant load and the cyclic load are realized.
Simulating acid rain leaching: the simulated acid rain box 4 controls the flow of the simulated acid rain through the constant flow pump 3 and is leached into the soil medium in the anaerobic box 12 through the spray head 25. The high-purity nitrogen gas bottle 2 continuously feeds high-purity nitrogen gas (with the volume concentration of 99.999%) to the anaerobic tank 12 through a spray head 25 to ensure anaerobic conditions, and leachate is collected through a filter funnel 13 and a filtrate receiver 14.
Electrochemical measurement: the device is a classical three-electrode system, consists of a Working Electrode (WE), an auxiliary electrode (CE) and a Reference Electrode (RE), and is provided with electrochemical measuring connector posts (WE connector posts 18, CE connector posts 19 and RE connector posts 20). Thus, the in-situ electrochemical measurement of the tensile stress sample during the acid rain leaching process can be performed by a conventional measuring device (such as a portable electrochemical workstation).
Claims (7)
1. The utility model provides a bury pipeline steel stress corrosion electrochemical test device under simulation acid rain leaching condition which characterized in that, the device includes: high-purity nitrogen cylinder, simulation acid rain case, compressor, air inlet, proof box, soil, reference electrode, Pt electrode, anaerobism case, pipeline steel electrode, weighing sensor, the concrete structure is as follows:
a test box is arranged in the anaerobic box, a spray head is arranged in the middle of the top of the anaerobic box and is positioned above the test box, and the spray head is respectively connected with the simulated acid rain box and the compressor through pipelines; an air inlet is formed in one side of the top of the anaerobic tank and connected with a high-purity nitrogen cylinder through a pipeline, and an air outlet is formed in the side, opposite to the air inlet, of the bottom of the anaerobic tank;
the soil is filled in the test box, a pipeline steel electrode and a Pt electrode are embedded in the soil horizontally, a reference electrode is inserted at the top of the soil, the pipeline steel electrode is a sheet-shaped tensile sample, one end of the pipeline steel electrode is connected with the fixed part, the other end of the pipeline steel electrode is connected with one side of the movable part, and the other side of the movable part is connected with one end of the weighing sensor through a screw rod.
2. The electrochemical test device for simulating the stress corrosion of the steel of the buried pipeline under the acid rain leaching condition according to claim 1, wherein the other end of the weighing sensor is connected with a worm gear speed reducer, the computer is connected with a stepping motor through a control box, and the output end of the stepping motor is connected with the worm gear speed reducer.
3. The electrochemical test device for simulating the stress corrosion of the steel of the buried pipeline under the acid rain leaching condition according to claim 1, wherein a filtrate receiver is arranged in the anaerobic tank, the filtrate receiver is positioned below the test tank, a filter funnel is arranged at the center of the bottom of the test tank, the lower part of the filter funnel corresponds to the filtrate receiver, and liquid seeped from soil is filtered by the filter funnel and then is received by the filtrate receiver.
4. The electrochemical test device for the stress corrosion of the steel of the buried pipeline under the simulated acid rain leaching condition according to claim 1, wherein a constant flow pump is arranged on a pipeline connecting the spray head and the simulated acid rain box.
5. The electrochemical test device for the stress corrosion of the steel of the buried pipeline under the simulated acid rain leaching condition according to claim 1, wherein a first gas purification device is arranged on a pipeline connecting a gas inlet and a high-purity nitrogen cylinder.
6. The electrochemical test device for the stress corrosion of the steel of the buried pipeline under the simulated acid rain leaching condition according to claim 1, wherein a second gas purification device is arranged on a pipeline connecting the spray head and the compressor.
7. The electrochemical test device for simulating the stress corrosion of the steel of the buried pipeline under the acid rain leaching condition according to claim 1, which is characterized by further comprising a WE terminal, a CE terminal and a RE terminal, wherein the WE terminal is connected with a steel electrode of the pipeline serving as a working electrode through a shielding lead wire through the screw rod and the movable part, the CE terminal is connected with a Pt electrode serving as an auxiliary electrode through the shielding lead wire, and the RE terminal is connected with a reference electrode through the shielding lead wire.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010124384.3A CN113310887A (en) | 2020-02-27 | 2020-02-27 | Electrochemical test device for stress corrosion of buried pipeline steel under simulated acid rain leaching condition |
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| CN202010124384.3A CN113310887A (en) | 2020-02-27 | 2020-02-27 | Electrochemical test device for stress corrosion of buried pipeline steel under simulated acid rain leaching condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112749A (en) * | 2021-11-24 | 2022-03-01 | 吉林大学 | Material corrosion tensile fatigue test device and method |
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2020
- 2020-02-27 CN CN202010124384.3A patent/CN113310887A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112749A (en) * | 2021-11-24 | 2022-03-01 | 吉林大学 | Material corrosion tensile fatigue test device and method |
| CN114112749B (en) * | 2021-11-24 | 2023-08-08 | 吉林大学 | Material corrosion tensile fatigue test device and method |
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