CN102072873B - Experiment device for couple corrosion - Google Patents
Experiment device for couple corrosion Download PDFInfo
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- CN102072873B CN102072873B CN2009102385671A CN200910238567A CN102072873B CN 102072873 B CN102072873 B CN 102072873B CN 2009102385671 A CN2009102385671 A CN 2009102385671A CN 200910238567 A CN200910238567 A CN 200910238567A CN 102072873 B CN102072873 B CN 102072873B
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Abstract
The invention relates to an experiment device for couple corrosion. The housing of the device is provided with two hollow cylinders which are connected with each other by an external edge at one end of each cylinder. The distance between two end faces is 3 to 5 mm, a round hole is formed on the two end faces respectively; the lining of the cylinder is positioned in the cylinder and is in embedding connection with the screw thread on the housing cylinder through the screw thread on the cylinder; a sealing ring, a diameter changing circle, a sealing ring and a sample are sequentially located in the lining of the two cylinders made of a stainless steel material, and the end is sealed by a fastening bolt, a sealing ring and a sealing bolt; a round hole is formed at the side surface centre, of the two cylinders, corresponding to the sample and is in conduction connection with the sample by a lead; an electrode wiring is led out from the round hole, the leaded electrode wiring is arranged at the side surface of the cylinder via a stainless steel bar with a screw thread; the experiment device for couple corrosion is simple in operation, excellent in sealing performance, stable in experiment result and strong in reproduction, so as to provide a simple experiment device with strong operation for couple corrosion research in labs.
Description
Technical field
The present invention relates to a kind of galvanizing corrosion test device, be used for containing CO between any two kinds of different metal materials
2/ H
2The experimental study of bimetallic corrosion takes place in the solution medium of S.
Background technology
Oil gas field is in the process of exploration, exploitation, because continuous complicacy, the harshness of environmental baseline, etching problem occurs more and more frequent, and kind is also more and more various.Therefore the more senior tubing of key position selection, corrosion resistant alloy also are a kind of preferred anti-corrosion measures in the down-hole according to etching problem.Well section at seriously corroded adopts the good material of corrosion stability; Can alleviate the term of life of tubing, drilling tool etc. like this; But between different well sections, different parts; If selection exists the direct connection of two kinds of materials of different potentials property to use, follow the intervention of etchant gas, local water etc. simultaneously, the contact corrosion that is easy between the generating material is a bimetallic corrosion.Galvanic effect is understood accelerated corrosion electronegative potential material and is caused tubing and casing perforation fracture.Therefore, it is significant to improving assembled casing string designed reliability and security development gas field to study bimetallic corrosion characteristic and the rule of different tubing.
In the research process of bimetallic corrosion, the area of (anode and cathode) is than being the principal element that influences bimetallic corrosion between the material, and therefore, the bimetallic corrosion characteristic key between the research different materials is to study the influence of the variation of its area ratio to its extent of corrosion.Test method adopts two kinds of electrochemical method and HTHP infusion methods usually; But never have and a kind ofly can confirm accurately that well area recently studies the test unit of bimetallic corrosion; Usually all be through sample being carried out welding lead, with epoxy resin two samples are encapsulated then, the area that exposes needs recently carries out electrochemical test; And the HTHP infusion method also is through two kinds of materials of binding, obtains the different area ratio with epoxy encapsulation and makes an experiment.The method troublesome poeration of this making working electrode, encapsulation exists area than out of true, and the edge sticks up skin easily and forms the slit, influences test findings.On the other hand when mounted, sample is placed face-to-face, between distance be difficult for fixingly, each test all is artificially to estimate to confirm, has therefore increased the instability of test.When utilizing soak test to calculate corrosion rate, the epoxy resin of encapsulation not easy-clear is clean, influences the weightless calculating of material, and then influences the corrosion research result.Therefore design a kind of simple to operate; Can the fixing sample position; The area ratio of the anode and cathode of easy definite bimetallic corrosion, and can satisfy the using value that the galvanizing corrosion test device that carries out electrochemical conditions test and HTHP immersion has comparatively extensive reality simultaneously.
Summary of the invention
The purpose of this invention is to provide between a kind of any two kinds of different metal materials and containing CO
2/ H
2The test unit of bimetallic corrosion takes place in the solution medium of S.Manufacture working electrode complicacy, ratio of cathodic to anodic area out of true and test unsettled situation when improving in the past galvanizing corrosion test.This device is according to the needs of research process, be designed with can satisfy testing requirements carry out the anode and cathode area identical with different area than the galvanizing corrosion test device that changes.This device carries out the variation of negative and positive area ratio according to testing requirements through the annulus resin circle radius of regulating exposed sample sheet area in two right cylinders, satisfies and to want the negative and positive area ratio that reaches.Test used sample and be processed as circle, need not encapsulate, directly install, device has packing washer, embedded electro-conductive liner, draws two electrodes through lead, carries out being connected of external circuits and electrochemical workstation.Two electrode cables of available U type bridge replacement connect two right cylinders, and the bimetallic corrosion that carries out the HTHP of different area ratio soaks zero-G test.This invention is simple to operate, and it is convenient to manufacture working electrode, and two electrode areas are easier and more accurate than regulating, and are convenient to widespread use in the experimental study.
A kind of galvanizing corrosion test device of the present invention is to be made up of shell, liner, sealing screw, reducing annulus, O-ring seal and trip bolt; Shell is the hollow cylinder of two polytetrafluoroethylmaterial materials, links together through an end outward flange, and distance is 3-5mm between two end faces, has a circular hole on two end faces; The liner that is cylindrical stainless steel material equally is positioned at right cylinder, inlays with the screw thread on the shell teflon right cylinder through the screw thread on the liner right cylinder to be connected; O-ring seal, reducing annulus, O-ring seal and sample are arranged in the liner of two right cylinder stainless steel materials successively, by trip bolt, O-ring seal and sealing screw sealed port; Corresponding sample position has circular port at center, two right cylinder sides; Be connected with the sample conducting by lead, extraction electrode wiring from circular port, the extraction electrode wiring is installed on the right cylinder side through screwed stainless steel metal rod; Or with a U type rod replacement stainless steel metal rod; U type rod adopts and the line of extraction electrode wiring with spline structure, and two is threaded, and connects two materials and makes it connection and reach the contact conducting.
The hole that the right cylinder working end has is built-in with the teflon reducing annulus of different radii through O-ring seal, is used for the area that conversion is exposed to the sample of solution, and the other end adds macromolecule resin screw with O-ring seal and seals, and sample and solution are isolated.
During test according to the ratio of cathodic to anodic area requirement, the size of flexible reducing internal radius, thus reach the exposed area ratio of conversion negative electrode or anode.
The subsidiary three mouthfuls of wide-necked bottles of this device, bore is ￠ 50mm * 1000mL, can be used for the bimetallic corrosion between two kinds of materials of electrochemical method test, and two electrodes are immersed in the wide-necked bottle, and with electrochemical workstation connection electrode lead, impressed voltage is tested.Also be used for the high temperature and high pressure kettle soak test, have the U type rod of metal wire to make two samples reach contact UNICOM in installing this moment, be placed in the testing liquid, carry out the zero-G test of bimetallic corrosion through aperture.The test back is the dismounting sample directly, carries out surperficial striping and handles, and this is simple to operate, and test accurately.
The present invention has designed a kind of galvanizing corrosion test device, is used for containing CO between any two kinds of different metal materials
2/ H
2The experimental study of bimetallic corrosion takes place in the solution medium of S.This device is simple to operate, and sample is not had special requirements such as encapsulation, and sample directly shapes according to dimensional requirement, and the polishing workplace gets final product, and fixed distance between two sample workplaces.Habitually in the past test operation needs special encapsulation sample, needs encapsulation again to manufacture working electrode during the ratio of cathodic to anodic area conversion again, complex procedures, and also it is unstable to encapsulate when bad test findings, the test poor reproducibility, and data are with a low credibility, waste time and energy.The resin that encapsulates during HTHP zero-G test simultaneously is difficult for cleaning out the direct test figure result that influences after test.With operation compared in the past, this device experiment is stable, and data are credible, thereby improved work efficiency, reduced experimentation cost.
This invention is simple to operate, and working electrode is easy to make, the device good airproof performance, and test findings is stable, and reappearance is strong, thereby test unit simple, strong operability is provided for the bimetallic corrosion research of testing laboratory.
Description of drawings
Fig. 1 galvanizing corrosion test apparatus structure synoptic diagram
Wherein:
1 sealing screw, 2 trip bolts, 3 samples, 4 reducing annulus, 5 O-ring seals, 6 liners, 7 shells, 8 O-ring seals, 9 shells, 10 samples, 11 trip bolts, 12 sealing screws, 13 holes, 14 O-ring seals, 15 reducing annulus, 16 holes, 17 O-ring seals, 18 O-ring seals, 19 O-ring seals, 20 liners.
Embodiment
A kind of galvanizing corrosion test device of the present invention is to be made up of: shell, liner, sealing screw, reducing annulus, O-ring seal and trip bolt; Shell 7,9 is hollow cylinders of two polytetrafluoroethylmaterial materials, links together through an end outward flange, and distance is 3～5mm between two end faces, has the circular hole of a ￠ 15mm on two end faces; The right cylinder overall diameter is that ￠ 32 * 20mm is thick; The liner 6,20 that is cylindrical stainless steel material equally is positioned at right cylinder, inlays with the screw thread on the shell teflon right cylinder through the screw thread on the liner right cylinder to be connected; Liner right cylinder external diameter is ￠ 26 * 18mm, and internal diameter is ￠ 20mm; O-ring seal 5,14, reducing annulus 4,15, O-ring seal 17,8 and sample 3,10 are put into successively the liner of stainless steel material from two cylindrical other ends; By trip bolt (φ 20 * 3mm) 2,11, O-ring seal 18,19 and sealing screw (internal diameter φ 20mm) 1,12 sealed port; Reducing annulus external diameter is ￠ 20mm; Internal diameter is respectively 10～5mm and does not wait, and thickness is 5mm, and sample is the thick circular test piece of ￠ 20 * 5mm; Corresponding sample position has the circular port 16,13 of φ 5mm at center, two right cylinder sides; Be connected with the sample conducting by lead; Matching thread on the stainless steel metal rod of extraction electrode wiring from circular port, the extraction electrode wiring ￠ 5mm through the teflon foreskin is arranged outward is installed on the right cylinder side; Or with U type rod, U type rod adopts and the line of extraction electrode wiring with spline structure, and two is threaded, and connects two materials and makes it connection and reach the contact conducting.
Claims (1)
1. a galvanizing corrosion test device is made up of shell, liner, sealing screw, reducing annulus, O-ring seal and trip bolt; It is characterized in that: shell is the hollow cylinder of two polytetrafluoroethylmaterial materials, links together through an end outward flange, and distance is 3～5mm between two end faces, has a circular hole on two end faces; The liner that is cylindrical stainless steel material equally is positioned at right cylinder, inlays with the screw thread on the shell teflon right cylinder through the screw thread on the liner right cylinder to be connected; One group of O-ring seal, reducing annulus, O-ring seal and sample that sets gradually towards the direction away from circular hole is respectively arranged, by trip bolt, O-ring seal and sealing screw sealed port in the liner of two right cylinder stainless steel materials; Corresponding sample position has circular port at center, two right cylinder sides; Be connected with the sample conducting by lead, extraction electrode wiring from circular port, the extraction electrode wiring is installed on the right cylinder side through screwed stainless steel metal rod; Or with a U type rod replacement stainless steel metal rod; U type rod adopts and the line of extraction electrode wiring with spline structure, and two is threaded, and connects two materials and makes it connection and reach the contact conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102385671A CN102072873B (en) | 2009-11-25 | 2009-11-25 | Experiment device for couple corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102385671A CN102072873B (en) | 2009-11-25 | 2009-11-25 | Experiment device for couple corrosion |
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| Publication Number | Publication Date |
|---|---|
| CN102072873A CN102072873A (en) | 2011-05-25 |
| CN102072873B true CN102072873B (en) | 2012-11-14 |
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| CN2009102385671A Active CN102072873B (en) | 2009-11-25 | 2009-11-25 | Experiment device for couple corrosion |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234893B (en) * | 2013-04-16 | 2015-10-28 | 北京工业大学 | A kind of metal material galvanic couple corrosion test grip device |
| CN103278442B (en) * | 2013-05-17 | 2016-02-17 | 中国海洋石油总公司 | A kind of underground pipe column galvanic corrosion pick-up unit |
| CN104914032B (en) * | 2014-03-13 | 2018-08-03 | 中国科学院宁波材料技术与工程研究所 | The method that the galvanic corrosion performance of water meter is tested |
| CN105319158B (en) * | 2015-02-25 | 2017-11-07 | 天津大学 | The cannot-harm-detection device and method of online prison detection metal welding jointses position galvanic corrosion sensitiveness |
| CN107796859B (en) * | 2016-09-06 | 2020-09-08 | 中国石油天然气股份有限公司 | Physical galvanic corrosion test device and test method |
| CN111650118A (en) * | 2020-07-10 | 2020-09-11 | 中国民航大学 | Electrochemical corrosion system for evaluating local corrosion performance of aircraft structure and working method |
| CN113514513A (en) * | 2021-07-13 | 2021-10-19 | 太原理工大学 | Temperature-controllable in-situ electrochemical hydrogen charging and testing integrated device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2432576Y (en) * | 2000-06-28 | 2001-05-30 | 中国科学院金属研究所 | Multifunctional corrosion real-time detection probe |
| CN101260526A (en) * | 2008-03-10 | 2008-09-10 | 中国人民解放军海军装备技术研究所 | Composite electric potential coupling corrosion control technique |
| JP2008304448A (en) * | 2007-02-05 | 2008-12-18 | Royal Scientific Society | Galvanic corrosion monitoring and analysing system (gcmas) |
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2009
- 2009-11-25 CN CN2009102385671A patent/CN102072873B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2432576Y (en) * | 2000-06-28 | 2001-05-30 | 中国科学院金属研究所 | Multifunctional corrosion real-time detection probe |
| JP2008304448A (en) * | 2007-02-05 | 2008-12-18 | Royal Scientific Society | Galvanic corrosion monitoring and analysing system (gcmas) |
| CN101260526A (en) * | 2008-03-10 | 2008-09-10 | 中国人民解放军海军装备技术研究所 | Composite electric potential coupling corrosion control technique |
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| CN102072873A (en) | 2011-05-25 |
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