CN103344548A - System for testing stray current corrosion of buried steel pipeline under function of tensile stress - Google Patents
System for testing stray current corrosion of buried steel pipeline under function of tensile stress Download PDFInfo
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Abstract
The invention discloses a system for testing stray current corrosion of a buried steel pipeline under the function of a tensile stress, belonging to the field of corrosion and protection of materials. The system comprises a stress loading experiment system, a soil environment simulating system, a stray current simulating system, a cathodic protection system and an electrochemical testing system. The stress loading experiment system generates a pressure required by a sample experiment; the soil environment simulating system simulates a soil environment in which a buried metal is, and soil solutions with different powers of hydrogen and conductivities are provided; the stray current simulating system generates a direct current, an alternating current and an alternating-current and direct-current mixed stray current; the cathodic protection system provides a cathodic protection potential for the sample; and the electrochemical testing system tests corrosion potentials of the sample under different influence factors. The system is capable of measuring weightlessness, obtaining corrosion morphology, generating the direct current, the alternating current and the alternating-current and direct-current mixed stray current, providing the stress required by the experiment according to the actual running condition, simulating the cathodic protection, and carrying out corrosion rule experiments under different influence factors.
Description
Technical field
The invention belongs to material corrosion and protection field, be specifically related to buried steel pipe stray current corrosion pilot system under a kind of drawing stress effect.
Background technology
Along with the buried pipe network even more complex of China, the etching problem that steel pipe in the pipe network causes under factor effects such as stray current and stress is more and more, endanger more seriously, therefore, it is very urgent to study buried steel pipe stray current corrosion rule under stress condition.Because stray current is subjected to all multifactor influences such as soil conductivity, the buried degree of depth and residing particular surroundings to be difficult to carry out field experiment, therefore, set up that buried steel pipe stray current corrosion pilot system becomes very necessary under the stress condition.At present, domestic existing single drawing stress proving installation, can carry out extension test to materials such as optical fiber, plastics, metals, existing tensile stress etching experimental provision can carry out the corrosion test of atmospheric environment to bar or sheet metal, also can do the stress corrosion (cracking) test of other objectionable impurities.But also there are some shortcomings in existing experimental provision, and for example the tension of Chan Shenging is less, narrow application range, and measuring accuracy is lower, can't carry out the stray current corrosion experiment, is difficult for measuring weightless, the difficult erosion profile that obtains.Domestic do not have buried steel pipeline stray current corrosion pilot system under the stress condition as yet, researches and develops therefore that buried steel pipe stray current corrosion pilot system becomes the basis of probing into buried steel pipe stray current corrosion influence factor and influencing rule under the drawing stress effect.
Summary of the invention
Less in order to overcome existing drawing stress proving installation and tensile stress etching experimental provision drawing stress, measuring accuracy is lower, can't carry out defectives such as stray current corrosion experiment, the present invention utilizes worm drive to produce tension, digital multimeter 19 shows the numerical value that high precision pull sensor 9 obtains in real time, utilizes direct supply 22, pulse signal generator 21, intelligent interrupter 20 to produce direct current, interchange, the straight mixed flow stray current of friendship; Utilize constant pressure source 12 to produce cathodic protection potential; Utilize 15 pairs of stressed samples of electrochemical workstation to carry out electro-chemical test; Utilize the soil liquid of pH meter 14 and conductivity meter 13 configuration different pH values and conductivity and the variation of monitoring soil liquid parameter in experimentation.This system has the weightlessness can measured; Can obtain erosion profile; Can produce direct current, interchange, alternating current-direct current mixed flow stray current; Can provide experiment required stress according to actual operating mode; Can simulate cathodic protection; Can carry out the functions such as corrosion regularity experiment under the different affecting factors (different stress levels, stray current kind/intensity, soil resistivity/conductivity, soil acidity or alkalinity etc.).
Buried steel pipe stray current corrosion pilot system under a kind of drawing stress effect, this system comprises stress load test system, soil environment simulation system, stray current simulation system, cathodic protection system, electro-chemical test system.Stress load test system produces the required pressure of specimen test; the residing soil environment of soil environment simulation system simulation buried metal; the soil liquid of configuration different pH values and conductivity; the stray current simulation system produces direct current, interchange, the straight mixed flow stray current of friendship; cathodic protection system provides cathodic protection potential for sample, the corrosion potential of sample under the electro-chemical test system testing different affecting factors.
Described stress load test system is made up of left lever 1, left bottom plate 2, long hexagon head bolt 3, electrolytic cell 4, sample 5, pin 6, pin cover 7, middle pull bar 8, S type pulling force sensor 9, right pull bar 10, right base plate 11, excitation power supply 17, voltage amplifier 18, digital multimeter 19;
It is characterized in that: two long hexagon head bolts 3 pass right base plate 11 and embed in left bottom plate 2 blind holes, two long hexagon head bolts 3 and left bottom plate 2, right base plate 11 form supports, are followed successively by left lever 1, sample 5, middle pull bar 8, S type pulling force sensor 9, right pull bar 10 between the base plate of the left and right sides; 11 of long hexagon head bolt 3 one ends and right base plates are for being threaded, and the other end and left bottom plate 2 blind holes are clearance fit; Left lever 1 and left bottom plate 2 are for being threaded, sample 5 is connected by two pins 6 respectively with middle pull bar 8 with left lever 1, be with pin cover 7 outside the pin 6 and be interference fit between the two, pin cover 7 is arranged in left lever 1 and pull bar 8 through holes, is interference fit between pin cover 7 and left lever 1 through hole and middle pull bar 8 through holes; For being threaded, right pull bar 10 passes right base plate 11 through holes and S type pulling force sensor 9 for being threaded between S type pulling force sensor 9 and the middle pull bar 8; Sample 5 passes electrolytic cell 4 middle parts; Sample 5 and the surface-coated insulating material that left lever 1, middle pull bar 8 contact guarantee that stray current is only by sample 5; Excitation power supply 17 both positive and negative polarities S type pulling force sensor 9 pumping signal line both positive and negative polarities respectively link to each other, S type pulling force sensor 9 output signal line both positive and negative polarities link to each other with voltage amplifier 18 input end both positive and negative polarities, S type pulling force sensor 9 shielding line ground connection, voltage amplifier 18 output terminals link to each other with digital multimeter 19.
Further, the soil environment simulation system comprises conductivity meter 13, probe P1, pH meter 14, probe P2; Conductivity meter 13 linking probe P1, pH meter 14 linking probe P2, probe P1, P2 all are immersed in the soil liquid of electrolytic cell.
Further, the stray current simulation system comprises pulse signal generator 21, power amplifier 23, constant current source 22, intelligent interrupter 20, the 3rd auxiliary electrode CE3, reometer A2, reometer A3, K switch 2, K switch 3; Pulse signal generator 21 links to each other with power amplifier 23, be connected intelligent interrupter 20 input anode behind the anodal serial connection of power amplifier 23 K switch 2 and the reometer A2, power amplifier 23 negative poles connect intelligent interrupter 20 input cathode, be connected intelligent interrupter 20 input cathode behind constant current source 22 negative poles serial connections K switch 3 and the reometer A3, intelligent interrupter 20 input anode of constant current source 22 anodal connections, intelligence interrupter 20 output head anodes connect sample 5, and negative pole connects the 3rd auxiliary electrode CE3.
Further, described cathodic protection system comprises constant pressure source 12, reometer A1, K switch 1, the first auxiliary electrode CE1; Be connected sample 5 behind the anodal first auxiliary electrode CE1 that connect of constant pressure source 12, negative pole serial connection K switch 1 and reometer A1.
Further, described electro-chemical test system is made up of PC 16, electrochemical workstation 15, contrast electrode RE, the second auxiliary electrode CE2; Electrochemical workstation 15 links to each other with PC 16, electrochemical workstation 15 3 electrodes are connected to form three-electrode system with sample 5, contrast electrode RE, the second auxiliary electrode CE2 respectively, contrast electrode RE is near sample 5, and distance is in 0.5cm to 2cm scope between contrast electrode RE and sample.
According to the many groups of experiment needs configuration soil simulation solution, the soil liquid character of configuration is similar to actual soil physico-chemical property, measure conductivity and the pH value of the soil liquid before the experiment with conductivity meter 13 and pH meter 14, in experimentation, still constantly use conductivity meter 13 and pH meter 14 test solution potential of hydrogen and conductivity values, when parameter takes place, need in time to adjust.
Pulse signal generator 21 can produce the AC signal of different frequency and amplitude, power amplifier 23 amplifies AC signal with the analog AC stray current, constant current source 22 produces the different direct current of intensity with the analog DC stray current, intelligent interrupter 20 can realize the continuing of stray current (duration), intermittently (the effect frequency) and moment three kinds of interference modes control.The switching of K switch 2, K3 can realize the control to interchange, direct current, three kinds of stray currents of alternating current-direct current mixed flow.
Constant pressure source 12 provides required cathodic protection potential for sample 5, and the switching of K switch 1 can realize sample 5 is had or not the control of cathodic protection.
Electrochemical workstation 15 test different affecting factors (soil resistivity/conductivity, soil acidity or alkalinity, different stress level, stray current kind/intensity, damaged area/peel off area etc.) are sample 5 corrosion potentials down.
The present invention can replace present widely used drawing stress proving installation and tensile stress etching experimental provision in some aspects, is buried steel pipe stray current corrosion pilot system under a kind of novel stress condition.This system has the weightlessness can measured; Can obtain erosion profile; Can produce direct current, interchange, alternating current-direct current mixed flow stray current; Can provide experiment required stress according to actual operating mode; The simulation cathodic protection; Can carry out the functions such as corrosion regularity experiment under the different affecting factors (different stress levels, stray current kind/intensity, soil resistivity/conductivity, soil acidity or alkalinity etc.), be widely used in the early-stage Study of the laboratory study of colleges and universities, scientific research institutions and metallurgy, material, building, mechanical enterprise.
Description of drawings
Fig. 1 is one-piece construction figure of the present invention.
Fig. 2 is the left lever front view.
Fig. 3 .1 is right base plate front view sectional view.Fig. 3 .2 is right base plate vertical view.
Fig. 4 is right pull bar front view.
Fig. 5 .1 is left bottom plate front view sectional view, and Fig. 5 .2 is the left bottom plate vertical view.
Fig. 6 is the sample vertical view.
Among the figure, left lever 1, left bottom plate 2, long hexagon head bolt 3, electrolytic cell 4, sample 5, pin 6, pin cover 7, middle pull bar 8, S type pulling force sensor 9, right pull bar 10, right base plate 11, constant pressure source 12, conductivity meter 13, pH meter 14, electrochemical workstation 15, PC 16, excitation power supply 17, voltage amplifier 18, digital multimeter 19, intelligent interrupter 20, pulse signal generator 21, constant current source 22, power amplifier 23.
Embodiment
Under a kind of drawing stress effect of the present invention shown in Figure 1 in the buried steel pipe stray current corrosion pilot system concrete structure, after stress load test system building finishes, rotate two long hexagon head bolts 3 simultaneously with spanner and produce axial tension stress by worm drive, regulate rotation amount and can change pulling force, observe the digital multimeter 19 registrations long hexagon head bolt 3 that when specifying pulling force, stops the rotation.In experiment, get final product if need adjusting sample 5 suffered drawing stresses only need rotate long hexagon head bolt 3.
Build soil environment simulation system, stray current simulation system, cathodic protection system, electro-chemical test system.Utilize the required soil liquid of soil environment simulation system configuration, the soil liquid is poured in the electrolytic cell 20.Open PC 16, electrochemical workstation 15, pulse signal generator 21, power amplifier 23, intelligent interrupter 20, constant current source 22, constant pressure source 12, conductivity meter 13, pH meter 14, excitation power supply 17, voltage amplifier 18, digital multimeter 19 power supplys.Carry out the corrosion regularity experiment under the different affecting factors (soil resistivity/conductivity, soil acidity or alkalinity, different stress level, stray current kind/intensity, damaged area/peel off area etc.) according to the following steps.
1, the sample 5 of Closing Switch K1 carries out cathodic protection.
2, open K switch 2 Closing Switch K3 and feed dc stray current to sample 5.
3, set in the parameter measurement sample 5 of electrochemical workstation 15 softwares in the PC 16 current potential and handle and obtain curve, conductivity meter 13 and pH meter 14 be conductivity and the potential of hydrogen of monitoring solution in real time.
4, change constant current source 22 strength of current, change intelligent interrupter 20 realize the continuing of electric currents (duration), intermittently (the effect frequency) and moment three kinds of forms interference, with electrochemical workstation 15 measurement sample 5 current potentials and handle and obtain curve.
5, Closing Switch K2 opens K switch 3 and feeds alternative stray current to sample 5, measures sample 5 current potentials and handle with electrochemical workstation 15 to obtain curve.
6, change frequency and the amplitude of pulse signal generator 21 signals, change intelligent interrupter 20 realize the continuing of electric currents, intermittently and moment three kinds of forms interference, with electrochemical workstation 15 measurement sample 5 current potentials and handle and obtain curve.
7, Closing Switch K2, K switch 3 feed to sample 5 and hand over straight mixed flow stray current, measure sample 5 current potentials and handle with electrochemical workstation 15 to obtain curve.
8, change sample 5 suffered stress, repeating step 2-7, every change primary stress comes again step 2-7, changes the laggard capable step 9 of two secondary stress at least.
9, disconnect all devices power supply, take out all electrodes and probe, electrolytic cell 4 solution are poured out, the soil liquid that conductivity is different with the pH value are poured into, connect all power supplys, carry out steps 10 after coming again step 2-8.
10, disconnect all devices power supply, take out all electrodes and probe, electrolytic cell 4 solution are poured out.
11, take out sample 5, dry to be placed on filter paper and measure corrosion back weight on the optical balance, obtain corrosion rate according to weight, test period and corroded area before the corrosion, sample 5 is placed observe under the optical microscope and take erosion profile with camera.Can draw under the drawing stress condition buried metal stray current corrosion influence factor and influence rule according to corrosion potential variation, corrosion rate, erosion profile.
Claims (5)
1. buried steel pipe stray current corrosion pilot system under the drawing stress effect is characterized in that: comprise stress load test system, soil environment simulation system, stray current simulation system, cathodic protection system, electro-chemical test system;
Described stress load test system is made up of left lever (1), left bottom plate (2), long hexagon head bolt (3), electrolytic cell (4), sample (5), pin (6), pin cover (7), middle pull bar (8), S type pulling force sensor (9), right pull bar (10), right base plate (11), excitation power supply (17), voltage amplifier (18), digital multimeter (19);
It is characterized in that: two long hexagon head bolts (3) pass right base plate (11) and embed in left bottom plate (2) blind hole, two long hexagon head bolts (3) and left bottom plate (2), right base plate (11) form support, are followed successively by left lever (1), sample (5), middle pull bar (8), S type pulling force sensor (9), right pull bar (10) between the base plate of the left and right sides; For being threaded, the other end and left bottom plate (2) blind hole is clearance fit between long hexagon head bolt (3) one ends and right base plate (11); Left lever (1) and left bottom plate (2) are for being threaded, sample (5) is connected by two pins (6) respectively with middle pull bar (8) with left lever (1), pin (6) is outer to be with pin cover (7) and to be interference fit between the two, pin cover (7) is arranged in left lever (1) and pull bar (8) through hole, is interference fit between pin cover (7) and left lever (1) through hole and middle pull bar (8) through hole; For being threaded, right pull bar (10) passes right base plate (11) through hole and S type pulling force sensor (9) for being threaded between S type pulling force sensor (9) and the middle pull bar (8); Sample (5) passes electrolytic cell (4) middle part; Sample (5) and the surface-coated insulating material that left lever (1), middle pull bar (8) contact guarantee that stray current is only by sample (5); Excitation power supply (17) both positive and negative polarity S type pulling force sensor (9) pumping signal line both positive and negative polarity respectively links to each other, S type pulling force sensor (9) output signal line both positive and negative polarity links to each other with voltage amplifier (18) input end both positive and negative polarity, S type pulling force sensor (9) shielding line ground connection, voltage amplifier (18) output terminal links to each other with digital multimeter (19).
2. buried steel pipe stray current corrosion pilot system under a kind of drawing stress effect according to claim 1, it is characterized in that: the soil environment simulation system comprises conductivity meter (13), probe P1, pH meter (14), probe P2; Conductivity meter (13) linking probe P1, pH meter (14) linking probe P2, probe P1, P2 all are immersed in the soil liquid of electrolytic cell.
3. buried steel pipe stray current corrosion pilot system under a kind of drawing stress effect according to claim 1, it is characterized in that: the stray current simulation system comprises pulse signal generator (21), power amplifier (23), constant current source (22), intelligent interrupter (20), the 3rd auxiliary electrode CE3, reometer A2, reometer A3, K switch 2, K switch 3; Pulse signal generator (21) links to each other with power amplifier (23), be connected intelligent interrupter (20) input anode behind the anodal serial connection of power amplifier (23) K switch 2 and the reometer A2, power amplifier (23) negative pole connects intelligent interrupter (20) input cathode, be connected intelligent interrupter (20) input cathode behind constant current source (22) negative pole serial connection K switch 3 and the reometer A3, anodal intelligent interrupter (20) input anode that connects of constant current source (22), intelligence interrupter (20) output head anode connects sample (5), and negative pole connects the 3rd auxiliary electrode CE3.
4. buried steel pipe stray current corrosion pilot system under a kind of drawing stress effect according to claim 1, it is characterized in that: described cathodic protection system comprises constant pressure source (12), reometer A1, K switch 1, the first auxiliary electrode CE1; Be connected sample (5) behind the anodal first auxiliary electrode CE1 that connects of constant pressure source (12), negative pole serial connection K switch 1 and reometer A1.
5. buried steel pipe stray current corrosion pilot system under a kind of drawing stress effect according to claim 1 is characterized in that: described electro-chemical test system is made up of PC (16), electrochemical workstation (15), contrast electrode RE, the second auxiliary electrode CE2; Electrochemical workstation (15) links to each other with PC (16), electrochemical workstation (15) three electrodes are connected to form three-electrode system with sample (5), contrast electrode RE, the second auxiliary electrode CE2 respectively, and distance is in 0.5cm to 2cm scope between contrast electrode RE and sample (5).
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| CN104515731A (en) * | 2014-12-18 | 2015-04-15 | 中国石油天然气股份有限公司 | Experimental device for simulation research buried pipeline cathodic protection efficiency |
| CN108303367A (en) * | 2018-04-02 | 2018-07-20 | 国网江西省电力有限公司电力科学研究院 | The test device and method of the accelerated corrosion of metallic ground material and cathodic protection |
| CN108562616A (en) * | 2018-01-16 | 2018-09-21 | 东莞新奥燃气有限公司 | A kind of outer detection method of natural gas line |
| CN109030337A (en) * | 2018-07-03 | 2018-12-18 | 北京工业大学 | A kind of buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM |
| CN110763449A (en) * | 2019-11-06 | 2020-02-07 | 河海大学 | Wharf model loading test device and test method |
| CN110865022A (en) * | 2019-12-05 | 2020-03-06 | 西南石油大学 | Metal pipeline corrosion experiment device and method under alternating current-direct current hybrid interference |
| CN111398023A (en) * | 2020-03-25 | 2020-07-10 | 中国船舶重工集团公司第七二五研究所 | Device and method for simultaneously realizing compact tensile loading sample corrosive solution environment and cathodic protection test environment and application |
| CN111398152A (en) * | 2019-01-02 | 2020-07-10 | 中国石油化工股份有限公司 | Interference corrosion test device of direct current stray current to pipeline |
| CN112048724A (en) * | 2020-09-11 | 2020-12-08 | 张兴莉 | Cathode protection system with external power supply |
| CN113933234A (en) * | 2021-12-15 | 2022-01-14 | 西南石油大学 | Evaluation method for gathering and transportation pipeline material selection |
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| CN104122196A (en) * | 2014-07-15 | 2014-10-29 | 北京工业大学 | Method for evaluating corrosion of DC stray current on high strength steel for oil gas pipeline under stress condition |
| CN104515731A (en) * | 2014-12-18 | 2015-04-15 | 中国石油天然气股份有限公司 | Experimental device for simulation research buried pipeline cathodic protection efficiency |
| CN108562616A (en) * | 2018-01-16 | 2018-09-21 | 东莞新奥燃气有限公司 | A kind of outer detection method of natural gas line |
| CN108303367A (en) * | 2018-04-02 | 2018-07-20 | 国网江西省电力有限公司电力科学研究院 | The test device and method of the accelerated corrosion of metallic ground material and cathodic protection |
| CN109030337A (en) * | 2018-07-03 | 2018-12-18 | 北京工业大学 | A kind of buried metal pipeline corrosion and corrosion protection layer peel test system based on SECM |
| CN109030337B (en) * | 2018-07-03 | 2021-05-07 | 北京工业大学 | Buried metal pipeline corrosion and anticorrosive coating peeling test system based on SECM |
| CN111398152A (en) * | 2019-01-02 | 2020-07-10 | 中国石油化工股份有限公司 | Interference corrosion test device of direct current stray current to pipeline |
| CN111398152B (en) * | 2019-01-02 | 2024-01-02 | 中国石油化工股份有限公司 | Interference corrosion test device for pipeline by direct current stray current |
| CN110763449A (en) * | 2019-11-06 | 2020-02-07 | 河海大学 | Wharf model loading test device and test method |
| CN110865022A (en) * | 2019-12-05 | 2020-03-06 | 西南石油大学 | Metal pipeline corrosion experiment device and method under alternating current-direct current hybrid interference |
| CN110865022B (en) * | 2019-12-05 | 2024-08-27 | 西南石油大学 | Metal pipeline corrosion experimental device under alternating current-direct current mixed interference |
| CN111398023A (en) * | 2020-03-25 | 2020-07-10 | 中国船舶重工集团公司第七二五研究所 | Device and method for simultaneously realizing compact tensile loading sample corrosive solution environment and cathodic protection test environment and application |
| CN111398023B (en) * | 2020-03-25 | 2023-06-23 | 中国船舶重工集团公司第七二五研究所 | Device, method and application for simultaneously realizing compact tensile loading sample corrosion solution environment and cathode protection test environment |
| CN112048724A (en) * | 2020-09-11 | 2020-12-08 | 张兴莉 | Cathode protection system with external power supply |
| CN112048724B (en) * | 2020-09-11 | 2023-02-28 | 李涛 | Cathode protection system with external power supply |
| CN113933234A (en) * | 2021-12-15 | 2022-01-14 | 西南石油大学 | Evaluation method for gathering and transportation pipeline material selection |
| CN113933234B (en) * | 2021-12-15 | 2022-07-01 | 西南石油大学 | Judging method for material selection of gathering and transportation pipeline |
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