CN204177718U - Evaluate the electrochemical test system of the lower oil-gas pipeline corrosion of alternative stray current interference - Google Patents
Evaluate the electrochemical test system of the lower oil-gas pipeline corrosion of alternative stray current interference Download PDFInfo
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- CN204177718U CN204177718U CN201420623093.9U CN201420623093U CN204177718U CN 204177718 U CN204177718 U CN 204177718U CN 201420623093 U CN201420623093 U CN 201420623093U CN 204177718 U CN204177718 U CN 204177718U
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Abstract
The utility model discloses a kind of electrochemical test system evaluating the lower oil-gas pipeline corrosion of alternative stray current interference, belong to oil-gas pipeline corrosion evaluation field.Described system comprises: for applying the ac signal loop of analog AC stray current; For carrying out the electro-chemical test loop of electrochemical test.The utility model is entered by ac signal in electro-chemical test loop introducing inductance original paper obstruct alternating current loop, introduce electric capacity original paper in alternating current loop simultaneously and intercept entering of DC signal in electro-chemical test loop, by adopting electricity original paper to the method for AC and DC electric signal isolation, the problem that the AC signal of the direct current signal and alternative stray current circuit that successfully solve electro-chemical test circuit interferes with each other, achieves the test carrying out pipe line steel galvanic corrosion behavior under alternative stray current interference.Experimental implementation is simple and easy to operate, and additional alternative stray current is quantitatively controlled, and institute's data that obtain accurately and reliably.
Description
Technical field
The utility model relates to oil-gas pipeline corrosion evaluation field, particularly a kind of electrochemical test system for the lower oil-gas pipeline corrosion of alternative stray current interference.
Background technology
The corrosion (AC-induced Corrosion) that alternative stray current causes has become one of buried oil gas pipeline key factor of transporting production safely of threat.Along with the fast development of oil and gas industry and the urbanization of constantly expansion, oil gas pipeline is inevitably through surrounding city and manufacturing district, particularly oil gas pipeline and forceful electric power circuit (ultra-high-tension power transmission line and attached wires of AC electrified railway) parallel to each other time, electromagnetic action due to forceful electric power circuit forms stray current and causes corrosion at pipeline coating damage place, finally causes pipeline corrosive perforation.It is reported, alternative stray current can cause the corrosion rate up to 5 ~ 10mm/a at the coating damage place of pipeline, this means once pipeline has coating damage point, pipeline will in 1 ~ 2 year very fast corrosion failure.The galvanic corrosion has following feature relative to the corrosion of other type: the first, and the galvanic corrosion speed is high; The second, alternative stray current easily causes local corrosion (particularly spot corrosion), larger relative to its harmfulness of uniform corrosion; 3rd, current the galvanic corrosion does not also have good Treatment process.
Just to begin one's study the galvanic corrosion as far back as 19 beginning of the century corrosion science men, but the corrosion that alternative stray current causes up to now is not all well understood, main cause is as follows: first, generally believe that corrosion causes primarily of DC stray current at first, the corrosion that alternating current causes is very little even can be ignored; The second, the electrochemical apparatus of major part research corrosion cannot carry out the test of direct current signal under alternative stray current signal disturbing; 3rd, because most the galvanic corrosion Study on Problems mainly concentrates on industry member, and the work of industry member corrosion engineering teacher is engineering test substantially, does not carry out research work deep too much.And in recent years along with the parallel construction of increasing high-tension electricity facility and long-distance transport pipes, the galvanic corrosion problem of long-distance transport pipes has had a strong impact on the safe operation of oil and gas long distance pipeline.Therefore, not only need the size of long-distance transport pipes being corroded from engineering aspect understanding alternative stray current and the order of severity, the more important thing is and will be familiar with the galvanic corrosion from corrosion mechanism aspect, thus propose corresponding alternative stray current safeguard procedures according to mechanism.
Current existing patent, the experimental provision of the stray current corrosion in a kind of simulated soil " (application number: 2013102425139) " mainly carries out alternative stray current to the corrosion rate of metal material and surface topography test by simulation actual industrial environment; " under a kind of stress and stray current coupling buried steel pipeline coating stripping and corrosion test system (application number: 2013103001961) " mainly simulates the impact that stress and stray current coupling are peeled off pipeline coatings.Above two patents all do not carry out the electro-chemical test of metal material or coating under alternative stray current signal function, as previously mentioned, because both alternative stray current signals interfere with each other on the DC signal of electrochemical apparatus and pipeline, so the galvanic corrosion cannot carrying out alternative stray current interference lower is tested.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of galvanic corrosion test macro for the lower oil-gas pipeline of alternative stray current interference, to realize the galvanic corrosion behavioural characteristic of Research on Oil gas pipeline under alternative stray current interference.
For reaching above object, the technical solution of the utility model is:
Comprise electrolytic cell, electrochemical workstation, and AC power; Wherein, in electrolytic cell, be provided with test solution, in test solution, be placed with working electrode, contrast electrode and to electrode; The cathode output end of AC power with to Electrode connection, the cathode output end of AC power is connected with working electrode by after variable resistor and capacitor, is formed and submits the ac signal loop of flowing stray current for simulating pipeline; The WE end of electrochemical workstation is connected with working electrode, and CE holds and to Electrode connection, forms the electro-chemical test loop for carrying out electrochemical Corrosion Behavior.
The cathode output end of described AC power is provided with alternating current ammeter.
The cathode output end of described AC power and to being provided with the first gauge tap between electrode.
Described electrochemical workstation and to being provided with the second gauge tap between electrode.
Described electrochemical workstation is provided with computer control system.
Inductance element is provided with between described electrochemical workstation and working electrode.
Described AC power is provided with shielded box.
Described is platinized platinum to electrode.
Described contrast electrode is saturated calomel electrode.
Compared with the prior art, the beneficial effects of the utility model are:
(1) the utility model is by adopting electricity original paper to the method for AC and DC electric signal isolation, the problem that the AC signal of the direct current signal and alternative stray current circuit that solve electro-chemical test circuit interferes with each other; Achieve and carry out direct current test chemical oil-gas pipeline corrosion behavior under alternative stray current interference; (2) by ac signal loop design capacitor for intercepting the direct current signal in electro-chemical test loop, achieve the evaluation of the electro-chemical test of the lower oil-gas pipeline corrosion of alternative stray current interference.
Further, the utility model devises gauge tap respectively in two loops, guarantees the security of system, is placed in electromagnetic shielding box by AC power simultaneously, avoids AC power to the interference of test macro.
Further, the utility model at electro-chemical test loop design inductance original paper for intercepting the AC signal of ac circuit.
Accompanying drawing explanation
Fig. 1 is used for the electro-chemical systems figure of the lower test oil gas pipeline corrosion of alternative stray current interference;
The corrosion potential curve map of Fig. 2 different size alternative stray current interference underground pipelines steel;
The electrochemical tests figure of Fig. 3 different size alternative stray current interference underground pipelines steel.
Wherein in Fig. 1: 1. computer control system; 2. electrochemical workstation; 3. inductance original paper; 4. gauge tap; 5. variohm; 6. capacitor; 7. AC power; 8. alternating current ammeter; 9. gauge tap; 10. shielded box; 11. working electrodes; 12. contrast electrodes; 13. test solutions; 14. pairs of electrodes; 15. electrolytic cells.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.See Fig. 1, the utility model comprises two loops: ac signal loop and electro-chemical test loop.
The utility model provides a kind of electrochemical test system evaluating the lower oil-gas pipeline corrosion of alternative stray current interference, comprises electrolytic cell 15, electrochemical workstation 2, and AC power 7; Wherein, in electrolytic cell 15, be provided with test solution 13, in test solution 13, be placed with working electrode 11, contrast electrode 12 and to electrode 14;
The cathode output end of AC power 7 is connected with to electrode 14 by alternating current ammeter 8, the cathode output end of AC power 7 is connected with working electrode 11 by variable resistor 5 and capacitor 6 are rear, forms the ac signal loop of submitting stream stray current for simulating pipeline; The cathode output end of AC power 7 and to being provided with the first gauge tap 9 between electrode 14.Ac signal changes size by variohm, and alternating current ammeter tests corresponding current value, and intercepts entering of DC signal in electro-chemical test loop by introducing electric capacity original paper in alternating current loop.
The WE end of electrochemical workstation 2 is connected with working electrode 11 with by inductance element 3, and CE end is connected with to electrode 14, forms the electro-chemical test loop for carrying out electrochemical Corrosion Behavior; Described electrochemical workstation 2 and to being provided with the second gauge tap 4 between electrode 14, intercepts entering of ac signal in alternating current loop by introducing inductance original paper in electro-chemical test loop.
In the utility model, described electrochemical workstation 2 is provided with computer control system 1, for the register system of logging test results.
Preferably, AC power 7 is provided with shielded box 10 AC power to be put into shielded box and reduce the interference of AC power to electro-chemical test loop.
Concrete, in the utility model, the major function in ac signal loop is the alternative stray current on the actual pipeline of simulation, and its loop is formed primarily of following functions original paper: variohm 5, capacitor 6, AC power 7, alternating current ammeter 8, gauge tap 9, shielded box 10, working electrode 11, test solution 13, to electrode 14, electrolytic cell 15.Concrete implementation step is as follows: open AC power 7, Closed control switch 9, the stray current size adjustment variohm 5 experimentally required, stray current size is met the requirements of by the reading observing alternating current ammeter 8, now in this loop, alternative stray current flows through working electrode 11 and to electrode 14, working electrode and pipe sample.
The major function in electro-chemical test loop is the pipeline galvanic corrosion behavior of test under alternative stray current interference, its loop is formed primarily of following functions original paper: computer control system 1, electrochemical workstation 2, inductance original paper 3, gauge tap 4, working electrode 11, contrast electrode 12, test solution 13, to electrode 14, electrolytic cell 15, wherein, described is platinized platinum to electrode 14, and described contrast electrode 12 is saturated calomel electrode.Concrete implementation step is as follows: open computer control system 1 and electrochemical workstation 2, experimentally require the correlation parameter that electrochemical workstation 2 is set, Closed control switch 4, carry out the test of galvanochemistry DC techniques, comprise corrosion potential test, polarization curve test, continuous current or constant potential test.
Accompanying drawing 2 ~ 3 is two specific embodiments of the present utility model.
Embodiment one: the lower corrosion potential test of different size alternative stray current interference
Step 1: sample solution prepares.Get X60 pipe line steel preparation work electrode, working electrode area is 1cm
2, configuration 0.5mol/L Na
2cO
3+ 1mol/L NaHCO
3+ 0.1mol/L NaCl solution 500mL, this solution is the high pH simulated solution in buried pipeline steel soil environment.
Step 2: circuit connects.Connect ac signal loop and electrochemical circuit according to accompanying drawing 1, check whether each circuit original paper connects normally, test two performance loop connectedness separately.
Step 3: apply analog AC stray current.Open AC power 7, Closed control switch 9, regulate variable resistor 5, the reading that alternating current ammeter is shown is that (current density is 50mA/cm to 50mA
2or be 500A/m
2).
Step 4: corrosion potential is tested.Open computer control system 1 and electrochemical workstation 2, Closed control switch 9, start corrosion potential software testing system, arranging the test duration is 30 minutes.Pipe line steel can be obtained at 500A/m after being completed
2analog AC stray current interference under corrosion potential.
Repeat step 1 ~ 4, distribution of current in step 3 is adjusted to 20mA, 10mA, 5mA, 2mA, 0mA, can 500A/m be obtained
2, 200A/m
2, 100A/m
2, 50A/m
2, 20A/m
2, 0A/m
2etc. the corrosion potential of serial alternative stray current interference underground pipelines steel, as shown in Figure 2.
Embodiment two: the lower activation polarization performance testing of different size alternative stray current interference
Step 1: sample solution prepares.Get X60 pipe line steel preparation work electrode, working electrode area is 1cm
2, configuration 0.5mol/L Na
2cO
3+ 1mol/L NaHCO
3+ 0.1mol/L NaCl solution 500mL, this solution is the high pH simulated solution in buried pipeline steel soil environment.
Step 2: circuit connects.Connect ac signal loop and electrochemical circuit according to accompanying drawing 1, check whether each circuit original paper connects normally, test two performance loop connectedness separately.
Step 3: apply analog AC stray current.Open AC power 7, Closed control switch 9, regulate variable resistor 5, the reading that alternating current ammeter is shown is that (current density is 50mA/cm to 50mA
2or be 500A/m
2).
Step 4: activation polarization performance testing.Open computer control system 1 and electrochemical workstation 2, Closed control switch 9, start electrochemical tests software testing system, arranging sweep speed is 0.33mV/s, scanning take-off potential is-0.3V (relative to corrosion potential), and it is 0.0V (relative to contrast electrode) that scanning stops current potential.Pipe line steel can be obtained at 500A/m after being completed
2analog AC stray current interference under polarization curve.
Repeat step 1 ~ 4, distribution of current in step 3 is adjusted to 20mA, 10mA, 5mA, 2mA, 0mA, can 0A/m be obtained
2, 20A/m
2, 50A/m
2, 100A/m
2, 200A/m
2, 500A/m
2the polarization curve of series alternative stray current interference underground pipelines steel, as shown in Figure 3.
Ac signal loop of the present utility model is mainly used in the alternative stray current signal (voltage or current density) applying different size, by variable resistor fixing quantity ac signal size, concrete size of current can show according to alternating current ammeter; Electro-chemical test loop is mainly used in the galvanic corrosion behavior of test oil gas pipeline, and test comprises the parameters such as thermodynamic parameter (corrosion potential, pitting potential), kinetic parameter (corrosion current density, spot corrosion current density), passivation/activation characteristic.
Claims (9)
1. evaluate an electrochemical test system for the lower oil-gas pipeline corrosion of alternative stray current interference, it is characterized in that: comprise electrolytic cell (15), electrochemical workstation (2), and AC power (7); Wherein, in electrolytic cell (15), be provided with test solution (13), in test solution (13), be placed with working electrode (11), contrast electrode (12) and to electrode (14); The cathode output end of AC power (7) is connected with to electrode (14), the cathode output end of AC power (7) is connected with working electrode (11) with capacitor (6) afterwards by variable resistor (5), forms the ac signal loop of submitting stream stray current for simulating pipeline; The WE end of electrochemical workstation (2) is connected with working electrode (11), and CE end is connected with to electrode (14), forms the electro-chemical test loop for carrying out electrochemical Corrosion Behavior.
2. a kind of electrochemical test system evaluating the lower oil-gas pipeline corrosion of alternative stray current interference according to claim 1, is characterized in that: the cathode output end of described AC power (7) is provided with alternating current ammeter (8).
3. a kind of electrochemical test system evaluating the lower oil-gas pipeline corrosion of alternative stray current interference according to claim 1, is characterized in that: the cathode output end of described AC power (7) and be provided with the first gauge tap (9) between electrode (14).
4. a kind of electrochemical test system evaluating the lower oil-gas pipeline corrosion of alternative stray current interference according to claim 3, is characterized in that: described electrochemical workstation (2) and be provided with the second gauge tap (4) between electrode (14).
5. a kind of electrochemical test system evaluating the lower oil-gas pipeline corrosion of alternative stray current interference according to claim 1, is characterized in that: described electrochemical workstation (2) is provided with computer control system (1).
6. a kind of electrochemical test system evaluating the lower oil-gas pipeline corrosion of alternative stray current interference according to claim 1, is characterized in that: be provided with inductance element (3) between described electrochemical workstation (2) and working electrode (11).
7. a kind of electrochemical test system evaluating the lower oil-gas pipeline corrosion of alternative stray current interference according to claim 1, is characterized in that: described AC power (7) is provided with shielded box (10).
8. a kind of electrochemical test system evaluating the lower oil-gas pipeline corrosion of alternative stray current interference according to claim 1, is characterized in that: described is platinized platinum to electrode (14).
9. a kind of electrochemical test system evaluating the lower oil-gas pipeline corrosion of alternative stray current interference according to claim 1, is characterized in that: described contrast electrode (12) is saturated calomel electrode.
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| CN108827867A (en) * | 2018-04-23 | 2018-11-16 | 中国矿业大学 | A kind of extracting method of the metro stray current corrosion characteristic information based on data mining technology |
| CN109541317A (en) * | 2018-12-06 | 2019-03-29 | 北京科技大学 | Stray electrical current interferes lower buried pipeline holiday resistance characteristic earth's surface test method |
| 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 |
| CN112798520A (en) * | 2020-12-31 | 2021-05-14 | 华南理工大学 | Simulation device for electrochemical corrosion of stray current to buried metal in soil environment |
| CN114372404A (en) * | 2022-01-07 | 2022-04-19 | 哈尔滨工业大学 | Precise dynamic calculation method for corrosion time-varying boundary of steel-concrete interface under stray electric field |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107796750A (en) * | 2017-11-03 | 2018-03-13 | 安徽新力电业科技咨询有限责任公司 | A kind of detection means of lossless audio coding aerial earth wire extent of corrosion |
| CN108827867A (en) * | 2018-04-23 | 2018-11-16 | 中国矿业大学 | A kind of extracting method of the metro stray current corrosion characteristic information based on data mining technology |
| CN108827867B (en) * | 2018-04-23 | 2020-10-09 | 中国矿业大学 | Subway stray current corrosion characteristic information extraction method based on data mining technology |
| CN109541317A (en) * | 2018-12-06 | 2019-03-29 | 北京科技大学 | Stray electrical current interferes lower buried pipeline holiday resistance characteristic earth's surface test method |
| 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 |
| CN112798520A (en) * | 2020-12-31 | 2021-05-14 | 华南理工大学 | Simulation device for electrochemical corrosion of stray current to buried metal in soil environment |
| CN114372404A (en) * | 2022-01-07 | 2022-04-19 | 哈尔滨工业大学 | Precise dynamic calculation method for corrosion time-varying boundary of steel-concrete interface under stray electric field |
| CN114372404B (en) * | 2022-01-07 | 2022-07-15 | 哈尔滨工业大学 | Precise dynamic calculation method for corrosion time-varying boundary of steel-concrete interface under stray electric field |
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