CN101608995A - The measuring method of galvanic corrosion and sample thereof under the high-stress state of welded tube weld seam - Google Patents
The measuring method of galvanic corrosion and sample thereof under the high-stress state of welded tube weld seam Download PDFInfo
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- CN101608995A CN101608995A CNA2008100393363A CN200810039336A CN101608995A CN 101608995 A CN101608995 A CN 101608995A CN A2008100393363 A CNA2008100393363 A CN A2008100393363A CN 200810039336 A CN200810039336 A CN 200810039336A CN 101608995 A CN101608995 A CN 101608995A
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Abstract
The measuring method of galvanic corrosion under a kind of high-stress state of welded tube weld seam, use electronic universal tester and the electrolytic cell assembly that comprises working electrode, auxiliary electrode, contrast electrode, salt bridge etc., electrochemical workstation, loading stress 0～800MPa, with potentiostatic method or galvanostatic method, correction of timing is because the STRESS VARIATION that stress relaxation produces records the circumferential tension and the circumferential tension of working electrode of deciding the welded tube commissure; The tensile sample that sample is that wide centre, two ends is narrow, the thick intermediate thin in two ends and two ends have connecting hole, under different loads, the guttering corrosion depth d 1 of test job electrode and uniform corrosion depth d 2, and then obtain working electrode guttering corrosion sensitivity coefficient α in actual applications, α=d1/d2.Stress relaxation can not take place in described method, and it is convenient to regulate stress in the process of the test; Sample loads and plastic yield even slippage can not take place when heavily stressed, can carry out the corrosion test under the condition of high ground stress; Can make full use of electrochemical workstation measures.
Description
Technical field
The present invention relates to a kind of galvanic corrosion fields of measurement that is used for atmospheric corrosion, corrosion or anticorrosion measurement, particularly, the present invention relates to the galvanic corrosion measuring method under a kind of high-stress state, more specifically, the present invention relates to a kind of measuring method of high-stress state galvanic corrosion of welded tube weld seam and the sample of use thereof.
Background technology
At present, because the raising of production technology and technology, welded tube more and more is applied to sleeve in oil field.The difference of welded tube and weldless steel tube is its two Weld Performance, especially is its two decay resistance difference.The general now electrochemistry anodic oxidation that adopts is handled by the accelerated corrosion to it, measures its guttering corrosion sensitivity coefficient.
Different with the body stress state through bakingout process with weld seam without heat treated welded tube.Especially in the welded tube commissure without bakingout process, exist very big stress and concentrate, this stress is concentrated and can be accelerated corrosion, even causes fracture.Still the report that does not have weld decay susceptibility under the relevant ERW welded tube stress condition up to now, still, the applicant learns, can adopt the stress loop loading stress to measure the corrosive nature of welded tube.
For example, number of patent application discloses the device and the measuring method of the measurement welding tube corrosion under a kind of stress state for the inventor's of " 200710045316.2 " application for a patent for invention.According to this method, working electrode adopts stress loop to load certain load, can measure the corrosion behavior of working electrode under the different loads and the guttering corrosion susceptibility in the practical application of mensuration welded tube; The electrolytic tank side is provided with a nut that compresses that is used for working electrode is applied lateral pressure, the working electrode that nut will be added with load is pressed on the foraminate electrolytic tank of dew side, has solved the complex-shaped non-corrosive face seal problem that causes of working electrode (sample); The electrolyte solution of electrolytic tank is brought in constant renewal in and is replenished, and has eliminated the influence that oxygen concentration and corrosion product are measured corrosion resisting property, can prevent that solution from overflowing and drain off simultaneously.The loam cake of electrolytic cell can be dismantled, and can clean it under the situation of not pulling down working electrode like this; Adopt galvanostatic method to measure, keep stable corrosion rate, reduced the influence that corrosion product butt welded seam corrosion resisting property is measured; Can truly measure the different butt welding pipe trench groove corrosion performance impacts that cause stress under the Different Heat Treatment Conditions.
But the problem that described method exists is: adopt the method for stress loop loading stress can not accurately show loading stress.Along with the corrosion of sample can take place a spot of stress loop the stress relaxation that can not show, and, regulate the stress inconvenience in the process of the test.
The problem that described method also exists is:
The sample loading stress area of outer processing is bigger, and the screw thread lifting surface area is little, loads plastic yield even slippage to take place when heavily stressed, can not carry out the corrosion test under the condition of high ground stress;
Though, adopt electronic universal tester can apply and regulate purpose stress accurately, present this testing machine exists the problem of conduction when being connected with electrochemical apparatus, can't make full use of electrochemical workstation and measure;
In addition, slippage takes place in tensile sample that said method adopts easily when clamping, can't load heavily stressed or the damage sample.
Summary of the invention
In order to overcome at present to the limitation and the deficiency of welded tube corrosion research, the objective of the invention is to, the measuring method of galvanic corrosion under a kind of high-stress state of welded tube weld seam is provided.Described method uses electronic universal tester and electrochemical apparatus to test.Stress relaxation can not take place in described method, and it is convenient to regulate stress in the process of the test; Sample loads and plastic yield even slippage can not take place when heavily stressed, can carry out the corrosion test under the condition of high ground stress; Can make full use of electrochemical workstation measures.
The present invention also aims to provide a kind of can be connected electronic universal tester with electrochemical apparatus to be used for the work sample that the welded tube weld decay is measured when testing.
The technical scheme of the measuring method of the high-stress state galvanic corrosion of welded tube weld seam of the present invention is as follows:
A kind of measuring method of high-stress state galvanic corrosion of welded tube weld seam, described method is used electronic universal tester and is comprised the electrolytic cell assembly of working electrode, auxiliary electrode, contrast electrode, salt bridge etc., electrochemical workstation, loading stress, the guttering corrosion tendency of working electrode under the test different loads, it is characterized in that
Connect by the device that carries out shown in Figure 10, after the working electrode that last lower clamp will contain resistance welded sleeve pipe weld seam is provided with, filling electrolyte solution in electrolytic cell, sample as working electrode is contacted with electrolyte solution, keep the constantly additional and renewal of electrolyte solution in the electrolytic cell, then it is carried out galvanochemistry accelerated corrosion;
20 ℃～40 ℃ of electrolyte solution temperature are measured polarization curve, obtain comparing from corrosion current;
Electronic universal tester, correction of timing is because the STRESS VARIATION that stress relaxation produces adopts X-ray diffraction method to measure the circumferential tension and the circumferential tension of working electrode of welded tube commissure;
The tensile sample that sample is that wide centre, two ends is narrow, the thick intermediate thin in two ends and two ends have connecting hole,
Under different loads, the guttering corrosion depth d 1 of test job electrode and uniform corrosion depth d 2, and then obtain working electrode guttering corrosion sensitivity coefficient α in actual applications, α=d1/d2.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention is characterized in that, described X-ray diffraction method, and it loads both stress differences is 0～800MPa, the electrolyte solution temperature range is 20 ℃～25 ℃.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention is characterized in that, described potentiostatic method, and when load during less than 400Mpa, its polarized potential scope is-400～-600mV, 48～144 hours polarization times; When load greater than 400Mpa during less than 800Mpa, its polarized potential scope is-600～-800mV, 48～144 hours polarization times.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention is characterized in that, described potentiostatic method, and when load during less than 400Mpa, its polarized potential scope is-500～-600mV, 72～120 hours polarization times; When load greater than 400Mpa during less than 800Mpa, its polarized potential scope is-600～-800mV, 72～120 hours polarization times.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention is characterized in that, described galvanostatic method, and when polarized current density was 0.001～0.01mA/cm2, the polarization time was 48～196 hours; When polarized current density was 0.01～0.1mA/cm2, the polarization time was 48～72 hours.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention is characterized in that described galvanostatic method, polarized current density are 0.005～0.05mA/cm2, and the polarization time is 72～120 hours; When polarized current density was 0.05～0.5mA/cm2, the polarization time was 48～72 hours.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention, it is characterized in that, the hole lifting surface area at sample two ends and middle weld decay position lifting surface area ratio are 4: 1-7: 1, guarantee that the pressure of insulative pin is 1/4～1/7 of sample corrosion area pressure.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention, it is characterized in that, described specimen size is: the wide 38-42mm in two ends, and the centre is narrow to be that 12-16mm, two ends are thick in the 10-15mm intermediate thin is 3-6mm, the diameter of two ends connecting hole is 16-20mm.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention is characterized in that, two ends coating epoxy resin plays insulating effect on the sample, conducts electricity when preventing that sample is connected with joint.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention is characterized in that the last lower clamp that described electronic universal tester is used comprises: the last lower sub that is connected with described electronic universal tester is used for fixing the latch of lower sub.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention, it is characterized in that described testing machine is the clamp-shaped unanimity up and down, difference is latch fixed orifice of Ge Kai up and down, the lower end is provided with the sample link slot, and the insertion of described latch makes between work sample and the anchor clamps insulate.
Measuring method according to the high-stress state galvanic corrosion of welded tube weld seam of the present invention is characterized in that described electrolytic cell comprises electrolytic tank, working electrode, auxiliary electrode, salt bridge; Described electrolytic tank adopts organic material to make, and is stamped battery patchhole and contrast electrode patchhole on the electrolytic tank; The electrolytic tank side is provided with electrolyte solution and flows out valve, and the another side is provided with a circular hole contacts electrolyte solution and sample, and the circular hole edge is inlaid with rubber band and seals; Use rubber belt that the sample of electrolytic cell and working electrode is linked together; Auxiliary electrode is fixed on the opposite of working electrode by electrolytic tank loam cake aperture, and its height is identical with the height of working electrode; Salt bridge is installed on the electrolytic tank top cover and with working electrode and is connected; Salt bridge is the right-angle type capillary pipe structure, and the auxiliary electrode of described platinized platinum is shaped as circle.
The sample that a kind of high-stress state galvanic corrosion that is used for the welded tube weld seam according to the present invention is measured, it is characterized in that, the tensile sample that described sample is that wide centre, two ends is narrow, the thick intermediate thin in two ends and two ends have connecting hole, the hole lifting surface area at described sample two ends and middle weld decay position lifting surface area ratio are 4: 1-7: 1, guarantee that the pressure of insulative pin is 1/4～1/7 of sample corrosion area pressure.
The measuring method of the high-stress state galvanic corrosion of welded tube weld seam according to the present invention can make electronic universal tester and electrochemical workstation join together to be applied to the measurement of welded tube guttering corrosion under the condition of high ground stress.By loading different stress, the corrosion resisting property of welded tube under the different service conditions is evaluated.
Sample of the present invention can make the heavily stressed requirement of satisfying sample perform region (sample middle part) under the lower condition of anchor clamps junction pressurized, has solved because of anchor clamps junction insulation course and has been subjected to the problem that High Voltage damages.
Sample of the present invention has solved conventional stress test sample and anchor clamps cause measuring inaccurate problem in heavily stressed screw thread generation plastic yield down of loading or damage.
Sample is because it is difficult for taking place plastic yield and clamping slippage, can use that electronic universal tester is accurate to load certain load and can change load easily with the variation of test condition, can measure the corrosion behavior of working electrode under the different loads and measure guttering corrosion susceptibility in the welded tube practical application.
Description of drawings
Fig. 1 is the front elevation of anchor clamps top connection of the present invention;
Fig. 2 is the side view of anchor clamps top connection of the present invention;
Fig. 3 is the front elevation of anchor clamps lower sub of the present invention;
Fig. 4 is the side view of anchor clamps lower sub of the present invention;
Fig. 5 is the vertical view of sample (working electrode);
Fig. 6 is the side view of sample (working electrode);
Fig. 7 is the insulative pin synoptic diagram;
Fig. 8 is the electrolytic cell synoptic diagram;
Fig. 9 is an assembly connection work synoptic diagram.
1 is last anchor clamps joint, 2,2 ' is respectively lower clamp joint and the electronic universal tester through hole that is connected of sleeve tool latch up and down, 3,3 ' is respectively the sample hanging hole of lower clamp joint, 4,4 ' is respectively the sample link slot of lower clamp joint, and 8 is the lower clamp joint, 9 is the connection through hole on the sample, 10 is sample, and 11 is last lower clamp joint and the electronic universal tester latch that is connected of sleeve tool up and down, and 12 use polytetrafluoroethylplastic plastic for insulating, 13,13 ' is respectively insulative pin, and 14,15 are respectively for platinum electrode and salt bridge patchhole, 16 electrolytic cell electrolysis work perforation circular holes for edge embedding lute, 17 is electrolytic cell, and 18 for electrolyte solution flows out valve, and 19 is electronic universal tester.
Embodiment
Below, for embodiment, the measuring method to the high-stress state galvanic corrosion of welded tube weld seam of the present invention is described in further detail in conjunction with the accompanying drawings.
Embodiment 1-3
Embodiment device comprises omnipotent (stretching) testing machine 19, electrolytic cell 17, electrolytic cell 17 comprises: as the working electrode of sample 10, auxiliary electrode, contrast electrode, salt bridge, and electrochemical workstation.
The last lower clamp of electronic universal tester comprises the last lower sub 1,8 that is connected with testing machine 19, the fixing latch 11 of going up lower sub, the insulative pin 13,13 ' of connection sample 10 and joint 1,8.Lower clamp joint geometry unanimity on the described electronic universal tester, latch of Ge Kai is fixing up and down respectively is respectively equipped with sample link slot 4,4 ' with through hole 3,3 ', two ends.Anchor clamps joint 1,8 two pin holes 2 that are connected with testing machine, 2 ' uses uninsulated steel latch 11 to insert fixing, the following through hole 3 that is connected with sample, 3 ' adopts polytetrafluoroethylplastic plastic 12 to coat, rise the steel latch 13 of insulating effect, 13 ' insert fixing, latch 13,13 ' makes between work sample 10 and the anchor clamps joint and insulate.
The tensile sample 10 that test sample is that wide centre, two ends is narrow, the thick intermediate thin in two ends and two ends have connecting hole, sample 10 is the wide 40mm in two ends, middle narrow 15mm, two ends thick 12mm intermediate thin 4mm, two ends have the diameter 19mm of connecting hole, promptly, the hole lifting surface area at sample two ends and middle weld decay position lifting surface area ratio are 5: 1, guarantee that the pressure of insulative pin is 1/5 of sample corrosion area pressure.Coatings epoxy resin in two ends plays insulating effect on the sample, conducts electricity when preventing that sample is connected with joint.
Use rubber belt that electrolytic cell and working electrode (sample) are linked together, that is, directly with the rubber bar electrolytic tank and sample are pinioned, its dismounting and dress sample are more convenient.Auxiliary electrode is fixed on the opposite of working electrode by electrolytic tank loam cake aperture, and its height is identical with the height of working electrode, and salt bridge is installed on the top cover of electrolytic tank and with working electrode and is connected.Salt bridge is the right-angle type capillary pipe structure, and the auxiliary electrode of described platinized platinum is shaped as circle.
Electrolytic tank adopts that transparent plexiglass plate is bonding to form.The electrolytic tank loam cake can freely be dismantled, and can inject electrolyte solution to electrolytic cell after the loam cake dismounting, and the electrolytic cell side is equipped with electrolyte solution and is flowed out valve 18, has two holes above, and insert for platinum electrode and salt bridge in hole 14, hole 15, and salt bridge is connected with contrast electrode again.The weld seam position is adjacent on electrolytic cell electrolysis working hole 17 and the sample, adopts rubber belt connection electrolytic cell and sample to make it fixing on every side.Sample two ends connection electrochemical workstation terminal clamp applies current potential and measures.
The mensuration system is: solvent or dispersion medium: water;
Supporting electrolyte: sodium chloride (3.5%), acetic acid-sodium acetate buffer solution (PH=6);
Connect by the device that carries out shown in Figure 9.
Last lower clamp joint 1, after 8 working electrodes 10 that will contain the ERW seam were provided with, filling electrolyte solution in electrolytic cell made working electrode (sample) contact with electrolyte solution, promptly, a circular hole 16 by electrolytic cell contacts with electrolyte, keeps the constantly additional and renewal of electrolyte solution in the electrolytic cell, promptly, electrolytic cell is provided with electrolyte and gets rid of valve 18, electrolyte solution is discharged with certain flow rate, and other connects an electrolyte storage bin, carries electrolyte solution in electrolytic cell with certain flow rate.Then it is carried out galvanochemistry accelerated corrosion, that is, adopt potentiostatic method to carry out accelerated corrosion." working electrode that contains the ERW seam " refers to and contains the ERW weld seam on the working electrode,, contains the working electrode of resistance welded sleeve pipe weld seam that is.Because guttering corrosion is to occur in the weld seam position, so will have weld seam.
20 ℃～40 ℃ of electrolyte solution temperature are measured polarization curve, obtain comparing from corrosion current.
Electronic universal tester 19 (model WDW-800, Shijin Group Co., Ltd., Jinan produces), to sample loading stress 0～800MPa, correction of timing is because the STRESS VARIATION that stress relaxation produces adopts X-ray diffraction method to measure the circumferential tension and the circumferential tension of working electrode of welded tube commissure.
The tensile sample that sample is that wide centre, two ends is narrow, the thick intermediate thin in two ends and two ends have connecting hole.
Under different loads, the guttering corrosion depth d 1 of test job electrode and uniform corrosion depth d 2 are compared d1 with d2, and then obtain working electrode guttering corrosion sensitivity coefficient α in actual applications, α=d1/d2.
Above anchor clamps joint 1 is an example.Last anchor clamps joint 1 is enclosed within the electronic universal tester upper bush tool, the latch 11 break-through via holes 2 that use instrument to carry are fixing, sample 10 1 ends are installed in the sample link slot 4, and the circular hole 9 on the sample is concordant with hole 3 on the joint, with fixedly sample 10 and last anchor clamps joint 1 in insulative pin 13 patchholes 3.Lower clamp joint 8 is installed on the instrument base with the quadrat method direction on the contrary by above-mentioned.
Test implementation mode and the results are shown in Table one.
The designed anchor clamps of the present invention can make electronic universal tester and electrochemical workstation join together to be applied to the measurement of welded tube guttering corrosion under the condition of high ground stress.These anchor clamps make sample and the insulation of stretching instrument, can adopt electrochemical workstation to carry out corrosion measurement.By loading different stress, the corrosion resisting property of welded tube under the different service conditions is evaluated.
The designed sample of the present invention can make the heavily stressed requirement of satisfying sample perform region (sample middle part) under the lower condition of anchor clamps junction pressurized, has solved because of anchor clamps junction insulation course and has been subjected to the problem that High Voltage damages.
The designed sample of the present invention has solved conventional stress test sample and anchor clamps cause measuring inaccurate problem in heavily stressed screw thread generation plastic yield down of loading or damage.
Sample is because it is difficult for taking place plastic yield and clamping slippage, can use that electronic universal tester is accurate to load certain load and can change load easily with the variation of test condition, can measure the corrosion behavior of working electrode under the different loads and measure guttering corrosion susceptibility in the welded tube practical application.
Except adopting galvanostatic method, sample is the wide 38mm in two ends, middle narrow 13mm, two ends thick 11mm intermediate thin 3mm, two ends have the diameter 17mm of connecting hole, promptly, the hole lifting surface area at sample two ends and middle weld decay position lifting surface area ratio are about 6: 1, the pressure that guarantees insulative pin is the about 1/6 of sample corrosion area pressure, does not record from corrosion current, outside solution temperature changes, other carry out measurement of the present invention as embodiment 1-3.
Embodiment 5
Except sample is the wide 42mm in two ends, middle narrow 18mm, two ends thick 15mm intermediate thin 6mm, two ends have the diameter 20mm of connecting hole, promptly, the hole lifting surface area at sample two ends and middle weld decay position lifting surface area ratio are about 5: 1, and the pressure that guarantees insulative pin is the about 1/5 of sample corrosion area pressure, outside solution temperature changes, other carry out measurement of the present invention as embodiment 1-3.
Embodiment 6
Except minute, solution temperature changed, other carried out measurement of the present invention as embodiment 1.
Embodiment 7
Except minute, solution temperature changed, other carried out measurement of the present invention as embodiment 4.
Table one
| Loading stress (MPa) | Solution temperature (℃) | Assay method | Corrosion potential | Apply corrosion potential/electric current | Minute (h) | From corrosion current (mA/cm 2) | ??d1 ??(mm) | ??d2 ??(mm) | The guttering corrosion sensitivity coefficient | |
| Embodiment 1 | ??150.8 | ??25 | Constant potential | ??-580mV | ??-480mV | ??96 | ??7.2×10 -6 | ??1.03 | ??0.78 | ??1.32 |
| Embodiment 2 | ??400.2 | ??25 | Constant potential | ??-650mV | ??-600mV | ??72 | ??6.4×10 5 | ??1.28 | ??0.88 | ??1.45 |
| Embodiment 3 | ??550.1 | ??25 | Constant potential | ??-720mV | ??-670mV | ??72 | ??3.8×10 4 | ??1.56 | ??0.99 | ??1.58 |
| Embodiment 4 | ??330.5 | ??35 | Continuous current | ??- | ??0.005 ??mA/cm2 | ??96 | ??- | ??0.9 | ??0.65 | ??1.38 |
| Embodiment 5 | ??250.4 | ??20 | Constant potential | ??- | ??-600mV | ??72 | ??- | ??1.31 | ??0.96 | ??1.37 |
| Loading stress (MPa) | Solution temperature (℃) | Assay method | Corrosion potential | Apply corrosion potential | Minute (h) | From corrosion current mA/cm 2 | ??d1 ??mm | ??d2 ??mm | The guttering corrosion sensitivity coefficient | |
| Embodiment 6 | ??150.8 | ??40 | Constant potential | ??-650mV | ??-550mV | ??48 | ??9.7×10 -6 | ??1.03 | ??0.82 | ??1.25 |
| Embodiment 7 | ??330.5 | ??25 | Continuous current | ??- | ??0.005 ??mA/cm 2 | ??72 | ??- | ??1.26 | ??0.98 | ??1.29 |
Embodiment 8-12
Except change loading stress, polarized potential or electric current and the time, other are as embodiment 1-5, and the corresponding respectively embodiment 8-12 that forms carries out measurement of the present invention.It the results are shown in table two.
Table two
| Loading stress (MPa) | Solution temperature (℃) | Assay method | Corrosion potential | Apply corrosion potential/electric current | Minute (h) | From corrosion current (mA/cm 2) | ??d1 ??(mm) | ??d2 ??(mm) | The guttering corrosion | |
| Embodiment | ||||||||||
| 8 | ??250.8 | ??25 | Constant potential | ??-580mV | ??-480mV | ??120 | ??8.5×10 5 | ??1.16 | ??0.85 | ??1.37 |
| Embodiment 9 | ??450 | ??25 | Constant potential | ??-680mV | ??-630mV | ??72 | ??8.1×10 5 | ??1.22 | ??0.82 | ??1.49 |
| Embodiment 10 | ??550.1 | ??25 | Constant potential | ??-720mV | ??-670mV | ??96 | ??3.8×10 4 | ??1.71 | ??1.09 | ??1.57 |
| Embodiment 11 | ??330.5 | ??35 | Continuous current | ??- | ??0.06 ??mA/cm2 | ??72 | ??- | ??1.26 | ??0.91 | ??1.38 |
| Embodiment 12 | ??250.4 | ??20 | Constant potential | ??- | ??-550mV | ??72 | ??- | ??1.37 | ??1.05 | ??1.31 |
The measuring method of the high-stress state galvanic corrosion of welded tube weld seam according to the present invention can make electronic universal tester and electrochemical workstation join together to be applied to the measurement of welded tube guttering corrosion under the condition of high ground stress.By loading different stress, the corrosion resisting property of welded tube under the different service conditions is evaluated.
Sample of the present invention can make the heavily stressed requirement of satisfying sample perform region (sample middle part) under the lower condition of anchor clamps junction pressurized, has solved because of anchor clamps junction insulation course and has been subjected to the problem that High Voltage damages.
Sample of the present invention has solved conventional stress test sample and anchor clamps cause measuring inaccurate problem in heavily stressed screw thread generation plastic yield down of loading or damage.
Sample is because it is difficult for taking place plastic yield and clamping slippage, can use that electronic universal tester is accurate to load certain load and can change load easily with the variation of test condition, can measure the corrosion behavior of working electrode under the different loads and measure guttering corrosion susceptibility in the welded tube practical application.
Claims (11)
1. the measuring method of the high-stress state galvanic corrosion of a welded tube weld seam, described method is used electronic universal tester and is comprised working electrode, auxiliary electrode, contrast electrode, the electrolytic cell assembly of salt bridge etc., electrochemical workstation, to sample loading stress 0～800MPa, the guttering corrosion tendency of working electrode under the test different loads, it is characterized in that, carrying out device connects, after the working electrode that last lower clamp will contain resistance welded sleeve pipe weld seam is provided with, filling electrolyte solution in electrolytic cell, sample as working electrode is contacted with electrolyte solution, keep the constantly additional and renewal of electrolyte solution in the electrolytic cell, then it is carried out galvanochemistry accelerated corrosion;
20 ℃～40 ℃ of electrolyte solution temperature are measured polarization curve, obtain comparing from corrosion current;
The STRESS VARIATION that the electronic universal tester correction of timing produces because of stress relaxation, the circumferential tension and the circumferential tension of working electrode of mensuration welded tube commissure;
The tensile sample that sample is that wide centre, two ends is narrow, the thick intermediate thin in two ends and two ends have connecting hole, under different loads, the guttering corrosion depth d 1 of test job electrode and uniform corrosion depth d 2, and then obtain working electrode guttering corrosion sensitivity coefficient α in actual applications, α=d1/d2.
2. the measuring method of the high-stress state galvanic corrosion of welded tube weld seam as claimed in claim 1, it is characterized in that, electronic universal tester loading stress 0～800MPa, measure its corrosion potential, in addition positive again 50-100mV current potential on its corrosion potential numerical value, 48～200 hours constant potential polarization time, the guttering corrosion tendency of working electrode under the test different loads.
3. the measuring method of the high-stress state galvanic corrosion of welded tube weld seam as claimed in claim 1 is characterized in that, described X-ray diffraction method, and it loads both stress differences is 0～800MPa, the electrolyte solution temperature range is 20 ℃～25 ℃.
4. the measuring method of the high-stress state galvanic corrosion of welded tube weld seam as claimed in claim 1, it is characterized in that, adopt potentiostatic method to test, when load during less than 400Mpa, its polarized potential scope is-400～-600mY, 72～120 hours polarization times; When load greater than 400Mpa during less than 800Mpa, its polarized potential scope is-600～-800mV, 72～120 hours polarization times.
The measuring method of the high-stress state galvanic corrosion of 5 welded tube weld seams as claimed in claim 1 is characterized in that, adopts galvanostatic method to test, and when polarized current density was 0.001～0.01mA/cm2, the polarization time was 48～196 hours; When polarized current density was 0.01～0.1mA/cm2, the polarization time was 48～72 hours.
6. the measuring method of the high-stress state galvanic corrosion of welded tube weld seam as claimed in claim 1, it is characterized in that, the hole lifting surface area at sample two ends and middle weld decay position lifting surface area ratio are 4: 1-7: 1, guarantee that the pressure of insulative pin is 1/4～1/7 of sample corrosion area pressure.
7. the measuring method of the high-stress state galvanic corrosion of welded tube weld seam as claimed in claim 5, it is characterized in that, described specimen size is: the wide 38-42mm in two ends, and the centre is narrow to be that 12-16mm, two ends are thick in the 10-15mm intermediate thin is 3-6mm, the diameter of two ends connecting hole is 16-20mm.
8. the measuring method of the high-stress state galvanic corrosion of welded tube weld seam as claimed in claim 1, it is characterized in that, the last lower clamp that described electronic universal tester is used comprises: the last lower sub that is connected with described electronic universal tester is used for fixing the latch of lower sub.
9. the measuring method of the high-stress state galvanic corrosion of welded tube weld seam as claimed in claim 7, it is characterized in that, described testing machine is the clamp-shaped unanimity up and down, latch fixed orifice of Ge Kai respectively, the lower end is provided with the sample link slot, and the insertion of described latch makes between work sample and the anchor clamps insulate.
10. the measuring method of the high-stress state galvanic corrosion of welded tube weld seam as claimed in claim 1 is characterized in that described electrolytic cell comprises electrolytic tank, working electrode, auxiliary electrode, salt bridge; Described electrolytic tank adopts organic material to make, and is stamped battery patchhole and contrast electrode patchhole on the electrolytic tank; The electrolytic tank side is provided with electrolyte solution and flows out valve, and the another side is provided with a circular hole contacts electrolyte solution and sample, and the circular hole edge is inlaid with rubber band and seals; Use rubber belt that electrolytic cell and sample as working electrode are linked together; Auxiliary electrode is fixed on the opposite of working electrode by electrolytic tank loam cake aperture, and its height is identical with the height of working electrode; Salt bridge is installed on the electrolytic tank top cover and with working electrode and is connected; Salt bridge is the right-angle type capillary pipe structure, and the auxiliary electrode of described platinized platinum is shaped as circle.
11. sample that is used for the high-stress state galvanic corrosion measurement of welded tube weld seam, it is characterized in that, the tensile sample that described sample is that wide centre, two ends is narrow, the thick intermediate thin in two ends and two ends have connecting hole, the hole lifting surface area at described sample two ends and middle weld decay position lifting surface area ratio are 4: 1-7: 1, guarantee that the pressure of insulative pin is 1/4～1/7 of sample corrosion area pressure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100393363A CN101608995B (en) | 2008-06-20 | 2008-06-20 | Method for testing electrochemical corrosion of welded pipe seam in high-stress state and sample of welded pipe seam |
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| CN2008100393363A CN101608995B (en) | 2008-06-20 | 2008-06-20 | Method for testing electrochemical corrosion of welded pipe seam in high-stress state and sample of welded pipe seam |
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