CN106124583A - A kind of reference electrode protection structure of the rotary erosion dynamic electrochemical test system of abrasion - Google Patents
A kind of reference electrode protection structure of the rotary erosion dynamic electrochemical test system of abrasion Download PDFInfo
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- CN106124583A CN106124583A CN201610684729.4A CN201610684729A CN106124583A CN 106124583 A CN106124583 A CN 106124583A CN 201610684729 A CN201610684729 A CN 201610684729A CN 106124583 A CN106124583 A CN 106124583A
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Abstract
The invention provides the reference electrode protection structure of a kind of rotary erosion dynamic electrochemical test system of abrasion, described reference electrode protection structure mainly includes reference electrode, contact conductor sleeve, front containment vessel and rear containment vessel；Described reference electrode includes calomel electrode and salt bridge, and salt bridge is to be made up of saturated potassium chloride and the agar mixture filled in Luggin capillary, calomel electrode and salt bridge composition reference electrode.Described reference electrode is contained in the middle of front containment vessel and rear containment vessel, and the wire of reference electrode is connected to potentiostat after being drawn by contact conductor sleeve, and the upper end of contact conductor sleeve is fixed on slurry tank cover plate.The working electrode of the present invention, auxiliary electrode and reference electrode are arranged in slip liquid, can reflect the electrochemical characteristic during erosive wear in real time, it is ensured that the verity of measurement result；Decreasing the attachment device that reference electrode is arranged on outside slurry tank, its simple in construction, operation is convenient, and testing efficiency is high simultaneously.
Description
Technical field:
The invention belongs to electro-chemical test assembly field, particularly relate to a kind of rotary erosion abrasion dynamic electric test chemical system
The reference electrode protection structure of system.
Background technology:
Along with the development of Electrochemical Measurement Technology, Electrochemical Measurement Technology has become as the one of research material corrosion field
Important characterization method, conventional corrosion electrochemistry research method has polarization curve analytic process, polarisation resistance method, electrochemical impedance spectroscopy
Method and electrochemistry noise etc..Electrochemical test method needs three-electrode system i.e. working electrode, auxiliary electrode and reference electrode,
Three electrodes are put in the electrolyzer (generally glass material) filling tested media, are wired to potentiostat.Tested
Examination material is working electrode, and relative with working electrode forms polarized circuit for auxiliary electrode, working electrode and auxiliary electrode；Often
Reference electrode have saturated calomel electrode, silver-silver chloride electrode and a standard hydrogen electrode etc., reference electrode forms with working electrode
Measuring loop, electric current flows to auxiliary electrode from working electrode, and independent reference electrode provides only reference and no current passes through.Auxiliary
Electrode and the outside usually glass tubing of reference electrode, be usually used in tested sample and medium is that electrochemical corrosion during static state is surveyed
Examination, it is difficult to directly apply to the dynamically lower electrochemical corrosion of tested sample and/or medium and test.
Liquid fixed double phase flow erosive wear phenomenon is prevalent in the industries such as metallurgy, chemical industry, mining, water conservancy and hydropower, is to lead
Cause the major reason of the flow passage components Rapid Damages such as various pipeline, transh pump, valve.During liquid fixed double phase flow erosive wear,
The erosive wear effect damaging existing fluid of workpiece, also has the corrosiveness of medium, also has both reciprocal actions simultaneously, have
Time the material bleed rate that causes of reciprocal action also bigger than pure corrosion and pure erosive wear sum, its extent of injury is than pure corrosion
Or pure erosive wear is bigger, reciprocal action includes that the promotion of erosive wear is made by erosive wear by the facilitation of corrosion and corrosion
With, during erosive wear, (dynamically) etching extent of material is more much greater than time static.Therefore, how by Electrochemical Measurement Technology
Being applied to rotary erosion abrasion test device, carry out dynamic on-line testing during erosion resistance tests, accurate characterization rushes
Etching extent in erosion wear process, for research material Erosion Wear Mechanisms, controls erosive wear process material bleed rate, if
Count suitable wear-resisting erosion resistance material, extend flow passage components and service life there is important theory and actual directive significance.
Wore and tore to solve to carry out rotary erosion in simple glass matter reference electrode cannot directly be placed in slurry tank
The problem of journey electro-chemical test, reference electrode is placed in the beaker of slip external container by some researcheres, by communicating pipe with
Slip liquid UNICOM, the operation of this system is more complicated, and glass beaker need to carefully fix, frangible.Although some researcheres are by three electrodes
System is both mounted in slip liquid, but sample is in rotation status mostly, and structure is complicated.China Patent No. CN
201010603782.X(entitled " a kind of rotary experimental device simulating inner-walls of duct erosion corrosion " discloses three electrode systems
System is both mounted in slip liquid, and auxiliary electrode (to electrode) and calomel electrode (reference electrode) are disposed adjacent to the interior of slurry tank
At wall, rotary shaft is placed in slurry tank core, is designed with adaptor in the middle part of rotary shaft, and adaptor two ends connect specimen holder
Tool, agitator arm is arranged at bottom, and rotary shaft drives specimen holder (platter), ring specimen and agitator arm to revolve in slurry tank
Transhipment is dynamic, carries out slip erosion resistance tests, and ring specimen carries out telecommunications by copper ball, spring, stainless steel bar, copper ring-carbon brush
Number output, be connected on electro-chemical test equipment carry out electrochemistry together with auxiliary electrode and calomel electrode and monitor in real time；This side
Method has concentrated the existing rotary and advantage of fluid-guiding type erosion-corrosion experiment device, but specimen holder (platter), annular are tried
Sample and agitator arm one act as high-speed motion, and structure is complicated, easily breaks down.As China Patent No. CN200820153330.4,
Entitled " the electrochemical behavior test device in dynamic fluid medium " is tested not for solving Electrochemistry Information in dynamic fluid
Accurate problem, by fixing work, auxiliary, reference these three electrode position, arrange flow velocity probe, and allow them with electrode one
Rise and rotate, working electrode, auxiliary electrode, reference electrode three electrode and the measurement of rate of flow probe in this device and electric machine rotational axis
The most synchronized rotation, the reliability of rotating mechanism and the protection of electrode are relatively difficult.For another example China Patent No.
CN201410035397.8, invention entitled " a kind of dynamically electrochemical testing device and attaching method thereof " disclose three electrode systems
System uses integration mode to be arranged in sample holder dish, and wherein auxiliary electrode is ring-type platinum filament, is positioned over distance working electrode about
In the cannelure of 10mm, working electrode is all connected reference electrode by line slot with the wire in power transmission shaft with auxiliary electrode and disposes
In the strip groove of clamping disk, end distance working electrode about 1-2mm, the other end is by the wire in hollow drive shaft even
Receive Dynamic link library pond.Three-electrode system is connected with three electrode connection plates by Dynamic link library pond, and last electrochemical signals transmits
To potentiostat；This device uses integration mode to be arranged in sample holder dish, arrange Dynamic link library pond container by three electrodes
With draw the structures such as three electrode cables in hollow drive shaft, owing in process of the test, container rotates with power transmission shaft, acusector begin
Good contacting is kept eventually, it is achieved the reliable and stable transmission of the electrochemical signals of sample to be tested in process of the test, truly with extraction ring
Reflect electrochemical corrosion situation and the Abrasion properties of sample to be tested in process of the test.But whole system part requirement complicated, each
Height, in Dynamic link library pond, solution does not seal, and easily occurs that solution splashes and leakage phenomenon in high-speed rotation.Additionally, it is civilian
Offer " development of liquid/solid double-phase scouring corrosion experiment apparatus and dynamic electric test chemical " (corrosion science and guard technology,
1993,5(4): 286-290) and document " the liquid fixed double phase flow erosive-corrosive wear research of rustless steel and carbon steel " (material engineering,
Hollow drive shaft 2004,11:37-40) is used to drive working electrode (platter) rotation, reference electrode and auxiliary electrode static
Method carries out dynamic electric test chemical and Erosive Properties analysis, but does not introduce protection and the fixation of electrode.
Summary of the invention:
In sum, in order to overcome the deficiency of prior art problem, the present invention have developed a kind of rotary erosion abrasion dynamic electric
The reference electrode protection structure of test chemical system, it solves the protection of reference electrode during rotary erosion wear test
Problem, devises the protection structure of reference electrode.The working electrode of the present invention, auxiliary electrode and reference electrode are arranged on slip
In liquid, the electrochemical characteristic during erosive wear can be reflected in real time, it is ensured that the verity of measurement result；Decrease reference simultaneously
The attachment device of electrode peripheral hardware, its simple in construction, operation is convenient, and testing efficiency is high.
The technical scheme is that and be achieved in that:
A kind of reference electrode protection structure of the rotary erosion dynamic electrochemical test system of abrasion, wherein, described reference electricity
Pole protection structure mainly includes reference electrode, contact conductor sleeve, front containment vessel and rear containment vessel；Before described reference electrode is contained in
In the middle of containment vessel and rear containment vessel, front containment vessel and rear containment vessel are connected by containment vessel screw；The wire of reference electrode passes through
Contact conductor sleeve is connected to potentiostat after drawing, and contact conductor sleeve is fixed on front containment vessel and rear containment vessel；Electrode
The upper end of lead-in wire sleeve is fixed on slurry tank cover plate.
Further, described reference electrode includes calomel electrode and salt bridge, and salt bridge is full by fill in Luggin capillary
Constitute with potassium chloride and agar mixture, calomel electrode and salt bridge composition reference electrode.
Further, described contact conductor sleeve is fixed on the upper of front containment vessel and rear containment vessel by sleeve connection screw
Side.
Further, the upper end of described contact conductor sleeve is provided with screw thread, is threadedly secured on slurry tank cover plate.
Further, described reference electrode protection structure is placed directly within internal fluid to be measured.
Further, front containment vessel and the rear containment vessel of described reference electrode protection structure are to use superhigh molecular weight polyethylene
Alkene material is made.
The invention has the beneficial effects as follows:
1, present invention greater impact masterpiece in the dynamic electric chemical test procedures protecting rotary erosion wear test equipment
Reference electrode under with, crosses stream set including having corrosive single-phase or liquid-solid two-phase fluid for each fields such as machinery, chemical industry
The electrochemical test system of the metal erosion Journal of Sex Researchs such as standby, pipeline；By design reference electrode protection structure, it is to avoid high velocity stream
Body directly impacts nature of glass reference electrode, solves the protection problem of electrode；By straight for the reference electrode assembly with protected structure
Connecing and be placed in inside slip liquid, reference electrode can be placed directly within high-velocity fluid (slip liquid) internal, working electrode is (tested
Sample) and auxiliary electrode be also disposed in slip liquid, the electrochemical characteristic during in real time reflection erosive wear, it is ensured that measurement result
Verity；Decrease the attachment device of reference electrode peripheral hardware simultaneously；
2, reference electrode of the present invention protection structure is split-type structural, simple in construction, and operation is convenient；Front containment vessel and after
Containment vessel is connected by containment vessel screw, and contact conductor sleeve is fixed on the upper of front containment vessel and rear containment vessel by telescope-srew
Side, contact conductor sleeve is threadedly secured on slurry tank cover plate, dismounts, easy to clean during use, and testing efficiency is high.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of duty of the present invention；
Fig. 2 is the shape and structure schematic diagram of the reference electrode protection structure of the present invention；
Fig. 3 is the assembling schematic diagram of the reference electrode protection structure of the present invention.
Detailed description of the invention:
So that the present invention is described in further detail below in conjunction with the accompanying drawings.
As it is shown in figure 1, the structural representation that Fig. 1 is duty of the present invention.Rotary erosion abrasion dynamically electrification in Fig. 1
Learn test system and include motor 1, transmission main shaft 2, potentiostat 3, auxiliary electrode 4, reference electrode protection structure 5, work electricity
For tested sample, (specimen size is 40 20 20mm, and in addition to 20 20mm are exposed, remaining five face is embedded in polytetrafluoro in pole 6
In the overcoat of ethylene protection structure), slurry tank 7, agitator arm 8, slurry tank cover plate 9 and slip liquid 10 etc.；Fig. 3 is reference electrode
The assembling schematic diagram of protection structure, as it is shown on figure 3, contact conductor sleeve 5-1, reference electrode 5-2, Luggin capillary 5-3, front guarantor
Protective case 5-4, rear containment vessel 5-5, containment vessel screw 5-6, sleeve connection screw 5-7.
See Fig. 1-3.The reference electrode protection structure of the rotary erosion dynamic electrochemical test system of abrasion, described ginseng
Than electrode protection structure mainly include reference electrode 5-2, contact conductor sleeve 5-1, Luggin capillary 5-3, front containment vessel 5-4 and
Rear containment vessel 5-5；Described reference electrode 5-2 is contained in the middle of front containment vessel 5-4 and rear containment vessel 5-5, front containment vessel 5-4 and rear guarantor
Protective case 5-5 is connected by containment vessel screw 5-6；The wire of reference electrode 5-2 is connected to after being drawn by contact conductor sleeve 5-1
On potentiostat 3, the output signal of telecommunication carries out electro-chemical test；Described contact conductor sleeve 5-1 passes through sleeve connection screw 5-7
It is fixed on front containment vessel 5-4 and the top of rear containment vessel 5-5；The upper end of contact conductor sleeve 5-1 is provided with screw thread, passes through screw thread
It is fixed on slurry tank cover plate 9；Described reference electrode 5-2 includes calomel electrode and salt bridge, and salt bridge is by Luggin capillary 5-3
The saturated potassium chloride of interior filling and agar mixture are constituted；Described reference electrode protection structure 5 is placed directly within treats fluid measured
Internal；The front containment vessel 5-4 and rear containment vessel 5-5 of described reference electrode protection structure are to use superhigh molecular weight polyethylene material
Make.
The work process of the present invention is as follows: as shown in Figure 1,3.
1, before on-test, the rotary erosion dynamic electrochemical test system of abrasion is first assembled.In Luggin capillary 5-3
Fill saturated potassium chloride, agar mixture constitutes salt bridge, and salt bridge and calomel electrode are assembled into reference electrode 5-2；By reference electrode
5-2 is placed in the middle of front containment vessel 5-4, rear containment vessel 5-5, and front containment vessel 5-4, rear containment vessel 5-5 are designed with threaded connection hole,
Front containment vessel 5-4, rear containment vessel 5-5 are connected by containment vessel screw 5-6；The wire of reference electrode 5-2 passes through contact conductor set
Cylinder 5-1 draws, and is connected on potentiostat 3 connect RE, electrode outlet line sleeve 5-1 and is threadedly attached on slurry tank cover plate 9.
Working electrode 6 is tested sample (a size of 40 20 20mm) surface finish, alcohol washes, uses analytical balance to weigh, then
It is installed in the overcoat of politef protection structure, in the middle of protection overcoat, is provided with electrode cable, by electrode cable by work
Electrode 6(tested sample) it is connected on potentiostat 3 connect WE, tested sample only exposes a test surfaces (20 20mm) and material
Serosity 10 contacts；Auxiliary electrode 4 is provided with protective measure, is fixed on slurry tank cover plate 9, is connected to permanent electricity by contact conductor
CE is met on the instrument 3 of position；See Fig. 1, auxiliary electrode 4 and working electrode 6 and be respectively placed in the both sides of reference electrode protection device 5, Lu Jin
The tip of capillary tube 5-3 and working electrode 6(tested sample) distance of exposed surface is between 0.5 ~ 2mm.
2, according to the different liquid-solid ratio of requirement of experiment preparation, the slip liquid 10 of different acid-alkali salt concentration.The slip that will prepare
Liquid 10 adds in slurry tank 7.It is promoted to contact with cover plate 9 and fix by slurry tank by control knob, now three-electrode system
It is contemporaneously immersed in the slurry medium of slurry tank 7.After soaking 30min pretreatment, first carry out Static Electro test chemical, by setting
Corresponding polarization potential and sweep speed, record polarization curve during static state.
3, starting control panel, arrange motor speed and test period, motor 1 drives transmission main shaft 2 to rotate, by stirring
Mix impeller 8 the slip liquid 10 in slurry tank 7 is stirred, start erosion resistance tests.In process of the test, as required, often
Separated in time carries out a dynamic electric test chemical, carries out dynamic potential scanning in different time points, records polarization curve.Examination
After testing end, the electrochemical test data recorded under static state and current intelligence are analyzed.Unload tested sample, through ultrasound wave
After (acetone) cleans, adopting sample weight after the erosion resistance tests that weighs with scale, the weight difference of sample is i.e. before experiment and after test
For weight loss.Use microscope to observe sample erosive wear rear surface pattern and can analyze the erosion of each sample material further
Abrasion mechanism.For the reliability of guarantee test result, with battery of tests in triplicate.
Claims (6)
1. the reference electrode protection structure of the rotary erosion dynamic electrochemical test system of abrasion, it is characterised in that: described
Reference electrode protection structure mainly include reference electrode, contact conductor sleeve, front containment vessel and rear containment vessel；Described reference electricity
Pole is contained in the middle of front containment vessel and rear containment vessel, and front containment vessel and rear containment vessel are connected by containment vessel screw；Reference electrode
Wire is connected to potentiostat after being drawn by contact conductor sleeve, and contact conductor sleeve is fixed on front containment vessel and rear containment vessel
On；The upper end of contact conductor sleeve is fixed on slurry tank cover plate.
The reference electrode protection knot of a kind of rotary erosion the most according to claim 1 dynamic electrochemical test system of abrasion
Structure, it is characterised in that: described reference electrode includes calomel electrode and salt bridge, and salt bridge is saturated by fill in Luggin capillary
Potassium chloride and agar mixture are constituted, calomel electrode and salt bridge composition reference electrode.
The reference electrode protection knot of a kind of rotary erosion the most according to claim 1 dynamic electrochemical test system of abrasion
Structure, it is characterised in that: described contact conductor sleeve is fixed on the upper of front containment vessel and rear containment vessel by sleeve connection screw
Side.
The reference electrode protection structure of the rotary erosion the most according to claim 1 dynamic electrochemical test system of abrasion,
It is characterized in that: the upper end of described contact conductor sleeve is provided with screw thread, is threadedly secured on slurry tank cover plate.
The reference electrode protection knot of a kind of rotary erosion the most according to claim 1 dynamic electrochemical test system of abrasion
Structure, it is characterised in that: described reference electrode protection structure is placed directly within internal fluid to be measured.
The reference electrode protection knot of a kind of rotary erosion the most according to claim 1 dynamic electrochemical test system of abrasion
Structure, it is characterised in that: the front containment vessel of described reference electrode protection device and rear containment vessel are to use superhigh molecular weight polyethylene
Alkene material is made.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106769583A (en) * | 2017-01-19 | 2017-05-31 | 北京科技大学 | A kind of rotary friction electrochemical testing device |
| CN108760614A (en) * | 2018-04-25 | 2018-11-06 | 上海海事大学 | The online electrochemical testing device of erosion corrosion and method |
| CN111678827A (en) * | 2020-07-19 | 2020-09-18 | 西南石油大学 | Erosion and corrosion interaction wear simulation test device |
| CN112683154A (en) * | 2020-12-28 | 2021-04-20 | 福州大学 | Indirect measurement method for abrasion of parts which are not easy to disassemble, such as high-speed switch valve and the like |
| CN114370901A (en) * | 2022-03-22 | 2022-04-19 | 四川省郫县豆瓣股份有限公司 | High-precision liquid flow measuring probe |
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