CN108754504A - A kind of cathodic protection potential detection device and its test method - Google Patents
A kind of cathodic protection potential detection device and its test method Download PDFInfo
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- CN108754504A CN108754504A CN201810892661.8A CN201810892661A CN108754504A CN 108754504 A CN108754504 A CN 108754504A CN 201810892661 A CN201810892661 A CN 201810892661A CN 108754504 A CN108754504 A CN 108754504A
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- cathodic protection
- test piece
- reference electrode
- cable
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/22—Monitoring arrangements therefor
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
- C23F2213/32—Pipes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The present invention relates to a kind of cathodic protection potential detection devices; including probe insulation shell, cathodic protection test piece and reference electrode; the probe insulation shell is the cavity of inner hollow; filler material is filled in cavity; the cathodic protection test piece, reference electrode are embedded on the roof of probe insulation shell, and the top of cathodic protection test piece, reference electrode is concordant with the outside of the roof；The cathodic protection test piece is closed annular, and the reference electrode is located among the encirclement of cathodic protection test piece.The cathodic protection potential detection device of the present invention has the characteristics of simple in structure, measurement result is reliable, the service life is longer.
Description
Technical field
The present invention relates to cathodic protection detection technique field, more particularly to a kind of cathodic protection potential test device and its survey
Method for testing.
Background technology
The buried objects of metals such as long fortune pipeline can be realized using cathode protecting process it is anticorrosive, and to metals such as long fortune pipelines
The accurate measurement of the cathodic protection potential of buried object, buried current potential is the key that such cathodic protection system.
Currently, well known polarized probe is composed of reference electrode, test piece, connecting wire, insulating layer and filler material.It will
Reference electrode and test piece are put into probe, and probe itself is made of insulating materials, serve as insulating layer, the rest part in probe by
Filler material occupies.When carrying out the cathodic protection potential measurement of buried pipeline somewhere, the test piece in probe is connected with test pile, so
During probe is placed into the soil afterwards, after waiting test pieces fully to polarize, the power-off voltage between test piece and reference electrode is measured, this voltage can
It is considered the cathodic protection potential of pipeline at test pile.
It is common to measure polarization potential（Cathodic protection potential）Mode have immediate electrical outage and test piece power-off two kinds of method, wink
Being interrupted electrical method can often be difficult to carry out in Practical Project because many inconvenient.
Test piece power-off method is that a test piece is buried at test point, and material, embedded conditions dictate be identical as pipeline or phase
Closely, test piece and the buried object of metal to be measured are electrically connected with conducting wire, and providing protective current to test piece from metal component makes test piece polarize.It surveys
The connecting wire between test piece and the buried object of metal need to be only disconnected when amount, so that it may to measure test piece switch-off potential, by the disconnected of test piece
Electric potential represents the current potential of the buried object of metal, so as to avoid cut-out main protection electric current and the trouble of other electrical connections.
But in the case where there is stray electrical current disturbed condition, since stray electrical current can flow on the test path of test piece and reference electrode
It is dynamic, the error of measurement result can be brought, i.e., is still unable to get accurate polarization potential.And for example buried steel of current certain metal components
The environmental aspect of matter pipeline is complex, and especially alternating current-direct current stray electrical current interference is very universal, in this disturbed condition
Under how to be just particularly important to measure to obtain true pipeline cathode protection polarization potential.
Further, since the detection needs of cathodic protection potential are long-term, persistently carry out, and repeatedly fill cathodic protection potential
Detection device can also consume a large amount of manpower and materials, increase maintenance cost, and the polarization of detection device is also required to the long period, because
This needs for a long time to fill cathodic protection potential detection device in the soil near the buried object of metal to be measured, in order to be able to long
Phase monitoring repeatedly measures；Filler material is generally copper-bath inside the phase detection device of the prior art, needs to place downward and bury
In burying, test piece, reference electrode are located at the bottom of detection device；Thus, with the passage of landfill time, earth's surface has certainly
Right sedimentation then makes reference electrode, cathodic protection examination in addition rainwash, can make the soil losses of detection device bottom
The contact effect between soil such as piece is deteriorated, or even no longer contacts, and not only leads to not measure true cathodic protection potential,
It also needs to be filled again incessantly, increases maintenance cost；Simultaneously because electrolyte loss is very fast, detection device is influenced
Service life.
Invention content
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of cathodic protection potential detection devices
And test method.The technical problem to be solved in the present invention is achieved through the following technical solutions：
A kind of cathodic protection potential detection device, including probe insulation shell, cathodic protection test piece and reference electrode；
The probe insulation shell is the cavity of inner hollow, and filler material, the cathodic protection test piece, reference are filled in cavity
Electrode is embedded on the roof of probe insulation shell, and cathodic protection test piece, reference electrode top and the roof it is outer
Side is concordant；
The cathodic protection test piece is closed annular, and the reference electrode is located among the encirclement of cathodic protection test piece.
Above-mentioned cathodic protection potential detection device, further includes multi-cable, is set on the roof of the probe insulation shell
There are the threading hole passed through for the multi-cable, the threading hole to be located at the outside of cathodic protection test piece；
The multi-cable includes cathodic protection cable, reference cable, and one end and the cathodic protection of the cathodic protection cable try
Piece connects, and one end of reference cable is connect with cathodic protection test piece；The other end of cathodic protection cable and reference cable is from described
Threading hole is pierced by the probe insulation shell.
Above-mentioned cathodic protection potential detection device, the filler material are low-impedance solid filler material.
Above-mentioned cathodic protection potential detection device, the solid filler material are bentonite.
Above-mentioned cathodic protection potential detection device, the probe insulation shell, which is adopted, to be made from an insulative material, the insulation
Material is polyvinyl chloride or polytetrafluoroethylene (PTFE).
Above-mentioned cathodic protection potential detection device further includes ac cable exchanges examination with being embedded on the roof
Piece, the exchange test piece are located at cathodic protection test piece side and concordant with the roof；
Described ac cable one end is connect with exchange test piece, and the other end is pierced by the probe insulation shell from the threading hole.
A kind of test method of the detection buried object cathodic protection potential of metal, includes the following steps：
1）A waste pit for filling cathodic protection potential detection device is dug near the buried object of metal to be measured；
2）By the cathodic protection potential detection device by cathodic protection test piece and reference electrode it is exposed upwardly in a manner of bury
Enter in waste pit so that cathodic protection potential detection device is in the buried object of metal to be measured under identical working environment, and is protected
Card cathodic protection test piece, reference electrode well contact for a long time with the covering on its surface；
3）By cathodic protection test piece by cathodic protection cable and the buried object electrical communication of metal to be measured, is measured and surveyed with measuring instrument
It measures the DC voltage between the buried object of metal to be measured and reference electrode and flows through the DC current of cathodic protection test piece；
4）When object electrical communication that exchange test piece is buried with metal by ac cable, metal to be measured is measured with measuring instrument
Alternating voltage between buried object and reference electrode and flow through the alternating current for exchanging test piece；
Above-mentioned steps 3）With step 4）Sequence can be interchanged.
Beneficial effects of the present invention：
1, cathodic protection potential detection device of the invention passes through ring by the setting of reference electrode on the inside of cathodic protection test piece
The cathodic protection test piece of shape masks the stray electrical current for flowing through or flowing into test path, to eliminate the pressure of interference electric current generation
Drop ensures the accurate measurement of cathodic protection potential and buried current potential.
2, reference electrode, cathodic protection test piece and threading hole are arranged on the roof of insulation shell by the present invention, are made
Used time by present apparatus top end upward, whole device buries in the soil so that the present apparatus can be tried with reference electrode, cathodic protection
Mode far from the earth's core fills in soil, avoids making reference electrode, cathode due to rain drop erosion, earth's surface normally sedimentation etc.
Contact effect of the test piece with soil is protected to be deteriorated, so as to cause the big problem of measurement result deviation；With simple in structure, measurement knot
The features such as fruit is reliable, and Acceptable life is long.
3, filler material of the invention uses low-impedance solid filling, solid filling effectively filler material can be avoided to ooze
The generation of leakage phenomenon is further ensured that avoid polluting cathodic protection test piece and reference electrode because liquid filler material leaks
The accuracy of measurement result.
4, the test method of the detection buried object cathodic protection potential of metal of the invention, by detecting cathodic protection potential
The cathodic protection test piece of device, reference electrode are embedded in a manner of far from the earth's core near the buried object of metal to be measured so that cathode is protected
Shield current potential detection device is in the buried object of metal to be measured under identical working environment, due to cathodic protection test piece, reference electrode
It remotely feels at ease dress, therefore even if under because of rain drop erosion, earth's surface free settling the effects that, still can well be contacted with soil,
Therefore it can fill for a long time, and can accurately measure the real polarization potential of the buried object of metal；It avoids repeating to fill, extend cloudy
The service life of electrode protector, uses manpower and material resources sparingly, and is easy to implement the remote monitoring of cathodic protection potential.
The present invention is described in further details below with reference to accompanying drawings and embodiments.
Description of the drawings
Fig. 1 is the structural schematic diagram of the cathodic protection potential detection device of the present invention.
Fig. 2 is the schematic top plan view of the cathodic protection potential detection device of the present invention.
Fig. 3 is the buried scheme of installation of the cathodic protection potential detection device of the present invention.
In figure：1, probe insulation shell；2, cathodic protection test piece；3, reference electrode；4, test piece is exchanged；5, threading hole；6,
Filler material；7, soil；8, ac cable；9, cathodic protection cable；10, reference cable.
Specific implementation mode
Reach the technological means and effect that predetermined purpose is taken for the present invention is further explained, below in conjunction with attached drawing and reality
Example is applied to specific implementation mode, structure feature and its effect of the present invention, detailed description are as follows.
Cathodic protection potential test device in order to solve the prior art causes it to measure due to being influenced by stray electrical current
Cathodic protection potential measurement result inaccuracy problem, present embodiments provide a kind of cathodic protection potential detection device,
Including probe insulation shell 1, cathodic protection test piece 2 and reference electrode 3, the probe insulation shell 1 is the cavity of inner hollow,
Filler material 6 is filled in cavity, the cathodic protection test piece 2, reference electrode 3 are embedded on the roof of probe insulation shell 1,
And the top of cathodic protection test piece 2, reference electrode 3 is concordant with the outside of the roof；The cathodic protection test piece 2 is closed
Annular, the reference electrode 3 are located among the encirclement of cathodic protection test piece 2；
The cathodic protection test piece 2 of annular can shield the electric current for flowing through test path, to eliminate the pressure drop of interference electric current generation；
The shape of cathodic protection test piece 2 can be arbitrary closed ring, such as regular polygon, irregular polygon etc., as long as
Can be formed one it is closed surrounding the through-hole of reference electrode 3；The cathodic protection test piece 2 of such structure can survey
Interference electric current, interference magnetic field and the electric interfering field on test path are shielded when examination, and cathodic protection test piece 2 is made to be in same electricity
Position, in order to obtain true cathodic protection potential.And cathodic protection test piece 2 use good conductor, such as copper, iron or with it is to be measured
The identical metal material of the buried object of metal.
The multi-cable includes cathodic protection cable 9, reference cable 10, one end and the moon of the cathodic protection cable 9
Pole protects test piece 2 to connect, and one end of reference cable 10 is connect with cathodic protection test piece 2；Cathodic protection cable 9 and reference cable 10
The other end be pierced by the probe insulation shell 1 from the threading hole 5.
The filler material 6 of the present embodiment uses low-impedance solid filler material, can be had using low-impedance solid filler material
Effect avoids 6 leakage phenomenon of filler material from occurring, to avoid polluting the accident of test piece and reference electrode 3 because liquid filler material leaks
Occur；Copper-bath etc. in general test piece can penetrate near test piece, cause test piece to chemically react, and eventually lead to
Protection potential, which measures, there is significantly deviation, and it is insincere and unavailable to even result in data.Low-impedance solid filler herein
The resistivity of material is generally less than 20 ohm-meters（Ω/m）；In addition, the moisture of the present embodiment is between reference electrode and insulation shell
Gap in penetrate into, bentonite can expand after absorbing moisture, and then prevent excess moisture from entering inside insulation shell；When more
Dry time or area in use, can water in the soil at the place of this detection device, make water from soil permeability to
This detection device place, then further from the gap penetration between test piece and insulation shell to bentonite where space；Certainly
Special Self-watering equipment can be equipped with.
It is using montmorillonite as the non-of main mineral constituent that solid filler material, which can select bentonite or montmorillonite, bentonite,
Mineral metal products, smectite structure press from both sides that one layer of alumina octahedral form by two oxygen-octahedrons 2：1 type crystal structure, due to
There are certain cations, such as Cu, Mg, Na, K for the layer structure that montmorillonite structure cell is formed, and these cations and montmorillonite are brilliant
The effect of born of the same parents is very unstable, is easily partially or completely exchanged by other cations, therefore has preferable ion exchangeable；
By the type of montmorillonite exchangeable cations, content and interlayer charge size, bentonite can be divided into sodium bentonite (alkalinity
Soil), calcium-base bentonite (alkaline earth soil), natural bleaching it is native (acid soil or Emathlite), wherein calcium-base bentonite is again including calcium
Sodium base and calcium and magnesium base etc..Bentonite has strong hygroscopicity and dilatancy, the water of adsorbable 8~15 times of own vols, body
Product expansion is up to several times to 30 times；As a form of gel and suspension can be dispersed into aqueous medium, this medium solution has certain
Viscosity, thixotropy and lubricity；There is stronger cation exchange capacity (CEC)；Have to various gases, liquid, organic substance certain
Adsorption capacity, maximal absorptive capacity is up to 5 times of weight of itself；The admixture of it and water, mud or fine sand has plasticity and sticks
Knot property；Acid bleaching soil with surface-active（Atlapulgite, natural bleaching soil-Emathlite）Coloured ion can be adsorbed.
In addition, the probe insulation shell 1 of the present embodiment is made of isolation material, material can select polyvinyl chloride or poly-
Tetrafluoroethene.
Test piece 4 is exchanged on the roof with being embedded in addition, further including ac cable 8, and the exchange test piece 4 is located at institute
State 2 side of cathodic protection test piece and concordant with the roof；8 one end of the ac cable with exchange test piece 4 connect, the other end from
The threading hole 5 is pierced by the probe insulation shell 1.Exchange test piece 4 is used for and is passed through measuring instrument after protective electrical communication
Device measures reference electrode 3 and by the alternating current and alternating voltage between protective.
The stray electrical current on ginseng test path is masked except through the cathodic protection test piece 2 of annular, to ensure to pass through
Other than the accuracy of the cathodic protection potential of the device to test and buried current potential, cathodic protection potential detection device of the invention is also
By being arranged threading hole 5, reference electrode 3, cathodic protection electrode and exchange test piece 4 in the same side of probe insulation shell 1,
And reference electrode 3, the exposed surface of cathodic protection test piece 2 and exchange test piece 4 and threading hole 5 are generally aligned in the same plane so that this spy
The reference electrode 3 of survey device, cathodic protection test piece 2, exchange test piece 4 can fill in a manner of far from the earth's core in soil 7, such as
This one, it is reference electrode 3, cloudy even if the reasons such as rain drop erosion ground settlement lead to the bottom of detection device, side soil erosion
Pole protects test piece 2 and exchange test piece 4 still can well be contacted with the soil 7 being covered at the top of it, and absorbs and penetrated into from earth's surface
Moisture with keep inside stuffing have certain humidity, and be avoided that in reference electrode 3 solution leakage pollution test piece test
Environment, thus detection device has and can run steadily in the long term, and without the characteristics of being filled repeatedly.
The method for measuring cathodic protection potential with the cathodic protection potential detection device of the present embodiment, such as Fig. 3 is given below
It is shown, include the following steps：
1）A waste pit for filling cathodic protection potential detection device is dug near the buried object of metal to be measured；
2）By cathodic protection potential detection device by cathodic protection test piece 2 and reference electrode 3 it is exposed upwardly in a manner of be embedded to
In waste pit so that cathodic protection potential detection device is in the buried object of metal to be measured under identical working environment, and is ensured
Cathodic protection test piece 2, reference electrode 3 well contact for a long time with the covering on its surface；
3）By cathodic protection test piece 2 by cathodic protection cable 9 and the buried object electrical communication of metal to be measured, measures metal to be measured and bury
DC voltage between atural object and reference electrode 3 and the DC current for flowing through cathodic protection test piece 2；
4）When object electrical communication that exchange test piece 4 is buried with metal by ac cable 8, the buried object of metal to be measured and reference are measured
Alternating voltage between electrode 3 with flow through the alternating current for exchanging 4 test pieces；
Above-mentioned steps 3）With step 4）Sequence can be interchanged.
The test method of the detection buried object cathodic protection potential of metal of the present invention, is filled by detecting cathodic protection potential
The cathodic protection test piece set, reference electrode are embedded in a manner of far from the earth's core near the buried object of metal to be measured so that cathodic protection
Current potential detection device is in the buried object of metal to be measured under identical working environment；Since cathodic protection test piece, reference electrode are remote
Liftoff dress of feeling at ease, therefore even if under because of rain drop erosion, earth's surface free settling the effects that, cathodic protection test piece, reference electrode are also
It is that can well be contacted with soil, therefore can fill for a long time, and can accurately measure the true polarization of the buried object of metal for a long time
Current potential；Cathodic protection potential detection device Acceptable life is long after primary landfill, avoids repeating to fill, extends cathodic protection dress
The service life set, uses manpower and material resources sparingly, and is easy to implement the remote monitoring of cathodic protection potential.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the present invention's
Protection domain.
Claims (6)
1. a kind of cathodic protection potential detection device, including probe insulation shell（1）, cathodic protection test piece（2）And reference electrode
（3）, it is characterised in that；
The probe insulation shell（1）For the cavity of inner hollow, cavity is interior to be filled with filler material（6）, the cathodic protection examination
Piece（2）, reference electrode（3）It is embedded in probe insulation shell（1）Roof on, and cathodic protection test piece（2）, reference electrode
（3）Top it is concordant with the outside of the roof；
The cathodic protection test piece（2）For closed annular, the reference electrode（3）Positioned at cathodic protection test piece（2）Encirclement
Among.
2. a kind of cathodic protection potential detection device according to claim 1, which is characterized in that further include multi-cable,
The probe insulation shell（1）Roof be equipped with the threading hole passed through for the multi-cable（5）, the threading hole（5）It is located at
Cathodic protection test piece（2）Outside；
The multi-cable includes cathodic protection cable（9）, reference cable（10）, the cathodic protection cable（9）One end with
Cathodic protection test piece（2）Connection, reference cable（10）One end and cathodic protection test piece（2）Connection；Cathodic protection cable（9）With
Reference cable（10）The other end from the threading hole（5）It is pierced by the probe insulation shell（1）.
3. a kind of cathodic protection potential detection device according to claim 1 or 2, which is characterized in that the filler material（6）
For low-impedance solid filler material.
4. a kind of cathodic protection potential detection device according to claim 3, which is characterized in that the solid filler material is
Bentonite.
5. a kind of cathodic protection potential detection device according to claim 3, which is characterized in that the probe insulation shell
（1）It adopts and is made from an insulative material, the insulating materials is polyvinyl chloride or polytetrafluoroethylene (PTFE).
6. a kind of test method of the detection buried object cathodic protection potential of metal, which is characterized in that include the following steps：
1）One is dug near the buried object of metal to be measured for filling the cathodic protection electricity as described in any one of claim 1-6
The waste pit of position detection device；
2）By the cathodic protection potential detection device with cathodic protection test piece（2）And reference electrode（3）It is exposed upwardly
Mode is embedded in waste pit so that cathodic protection potential detection device is in identical working environment with the buried object of metal to be measured
Under, and ensure cathodic protection test piece（2）, reference electrode（3）It is well contacted for a long time with the covering on its surface；
3）By cathodic protection test piece（2）Pass through cathodic protection cable（9）With the buried object electrical communication of metal to be measured, measuring instrument is used
Measure the buried object of metal to be measured and reference electrode（3）Between DC voltage and flow through cathodic protection test piece（2）DC current；
4）Test piece will be exchanged（4）Pass through ac cable（8）When object electrical communication buried with metal, gold to be measured is measured with measuring instrument
Belong to buried object and reference electrode（3）Between alternating voltage with flow through the alternating current for exchanging test piece；
Above-mentioned steps 3）With step 4）Sequence can be interchanged.
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Cited By (7)
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| CN109536968A (en) * | 2018-12-21 | 2019-03-29 | 西安英柯迈信息技术有限公司 | Cathodic protection conducting wire and the no-welding mounting device and detection method by protective |
| CN109609958A (en) * | 2019-01-15 | 2019-04-12 | 常州大学 | A kind of device enhancing cathodic protection coupon and soil contact |
| CN110257834A (en) * | 2019-07-24 | 2019-09-20 | 青岛雅合科技发展有限公司 | Casing interior conduit cathodic protection detection device and its installation method |
| CN110656335A (en) * | 2019-11-01 | 2020-01-07 | 贵州电网有限责任公司 | Transformer substation grounding device cathode protection potential detection system and detection method thereof |
| CN112376053A (en) * | 2020-10-10 | 2021-02-19 | 北京科技大学 | Anti-interference probe and system for controlling polarization potential of potentiostat |
| CN112376054A (en) * | 2020-10-10 | 2021-02-19 | 北京科技大学 | Anti-interference cathode protection polarization probe structure and test method |
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