CN210367917U - Cathode protection test probe - Google Patents

Cathode protection test probe Download PDF

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Publication number
CN210367917U
CN210367917U CN201920836341.0U CN201920836341U CN210367917U CN 210367917 U CN210367917 U CN 210367917U CN 201920836341 U CN201920836341 U CN 201920836341U CN 210367917 U CN210367917 U CN 210367917U
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cavity
test
test piece
polarization
outer cavity
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CN201920836341.0U
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李龙
张石超
苗金豹
苗松
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Xi'an Yingkemai Information Technology Co ltd
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Xi'an Yingkemai Information Technology Co ltd
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Priority to PCT/CN2019/110374 priority patent/WO2020244107A1/en
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/04—Corrosion probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Environmental & Geological Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Environmental Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
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  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
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  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)

Abstract

The utility model particularly relates to a cathodic protection test probe, which comprises an outer cavity, a polarization test piece, an inner cylinder, an alternating current test piece, a copper electrode and a test cable, wherein the polarization test piece is in a hollow cylinder shape and is coated on the outer wall of the outer cavity; the AC test piece is embedded in the inner side of the top of the outer cavity; the copper electrode is inserted into the inner cavity of the inner cylinder from the center of the bottom of the outer cavity and is fixed with the outer cavity and the inner cavity in a sealing way; copper sulfate crystals are filled between the copper electrode and the inner wall of the inner cylinder; 3 leads of the 3-core test cable are respectively connected with the polarization test piece, the alternating current test piece and the copper electrode. The utility model discloses a cathodic protection test probe adopts hollow cylindric polarization test block to surround test electrode, has eliminated the foreign current interference, and adopts full solid state structure, and no seepage, non-staining test block, the test result is more reliable.

Description

Cathode protection test probe
Technical Field
The utility model belongs to the technical field of cathodic protection detects, concretely relates to cathodic protection test probe.
Background
At present, two common ways of measuring polarization potential (cathodic protection potential) include an instantaneous interruption method and a test piece interruption method, and the instantaneous interruption method is often difficult to implement due to much inconvenience in practical engineering. The test piece electrical method is to embed a test piece at the test point, the material and the embedding state of the test piece are required to be the same as or close to those of the pipeline, the test piece is electrically connected with the metal buried object to be tested by a lead, and the metal member provides protective current for the test piece to polarize the test piece. When in measurement, the power-off potential of the test piece can be measured only by disconnecting the connecting wire between the test piece and the metal buried object, and the power-off potential of the test piece represents the potential of the metal buried object, so that the trouble of cutting off the main protection current and other electric connections is avoided.
However, under the condition of stray current interference, the stray current flows on the test paths of the test strip and the reference electrode, which brings errors of measurement results, that is, accurate polarization potential cannot be obtained. At present, the environmental conditions around some metal components such as buried steel pipelines are complex, especially the interference of alternating current and direct current stray currents is very common, and how to measure and obtain the real cathodic protection polarization potential of the pipeline under the interference condition is very important.
In addition, because the detection of the cathodic protection potential needs to be carried out for a long time and continuously, a large amount of manpower and material resources are consumed when the cathodic protection potential detection device is installed for many times, the maintenance cost is increased, and the polarization of the detection device also needs to be long-term, the cathodic protection potential detection device needs to be buried in the soil near the metal buried object to be detected for a long time, so that the cathodic protection potential detection device can be monitored for a long time and measured for many times; the filling material in the phase detection device in the prior art is generally copper sulfate solution, and needs to be placed downwards and buried in soil, and the test piece and the reference electrode are positioned at the bottom of the detection device; therefore, as the landfill time goes on, the earth surface naturally subsides, and the soil at the bottom of the detection device is lost due to the scouring of rainwater, so that the contact effect between the reference electrode, the cathode protection test piece and the soil is deteriorated and even no longer contacted, so that the real cathode protection potential cannot be measured, and the landfill is carried out again uninterruptedly, thereby increasing the maintenance cost; meanwhile, the electrolyte is quickly lost, so that the service life of the detection device is influenced.
Therefore, portable cathodic protection test probes are becoming increasingly popular. However, the polarization potential of the buried cathodic protection structure is affected by the cathodic protection current of the protected object, the geomagnetic current and the current flowing through or into the protected object when other external structures are discharged to the ground, the conventional portable cathodic protection test probe cannot effectively resist the interference of an electric field and a magnetic field, and the copper sulfate solution filled in the probe easily permeates outwards, so that the test strip is polluted, and the electrode potential is shifted and the error of the measured data is increased because the copper electrode is exposed to air to be oxidized when the copper sulfate solution is replaced/added.
SUMMERY OF THE UTILITY MODEL
In order to solve the easy problem of being disturbed and copper sulfate solution infiltration and copper electrode oxidation that exists among the current portable cathodic protection test probe, the utility model provides a cathodic protection test probe, this cathodic protection test probe adopt hollow cylindric polarization test block to surround test electrode, have eliminated the impurity current interference, and adopt full solid state structure, no seepage, non-staining test block, copper electrode is not by the oxidation, and the test result is more reliable. The to-be-solved technical problem of the utility model is realized through following technical scheme:
a cathodic protection test probe comprises an outer cavity, a polarization test piece, an inner cavity, an alternating current test piece, a copper electrode and a test cable;
the polarization test piece is in a hollow cylinder shape, is embedded on the outer wall of the outer cavity and is fixedly connected with the outer wall of the outer cavity, and is coaxially arranged with the outer cavity and the inner cavity;
the alternating current test block is embedded on the top wall of the outer cavity;
the copper electrode is inserted into the inner cavity of the inner cavity from the center of the bottom of the outer cavity, and the copper electrode and the outer cavity are sealed and fixed;
copper sulfate crystals are filled between the copper electrode and the inner wall of the inner cavity;
and 3 leads in the test cable are respectively connected with the copper electrode, the polarization test piece and the alternating current test piece.
Further, a cavity filled with micro-seepage filler is arranged between the top of the inner cavity and the top of the outer cavity, and the cavity is communicated with the inner cavity.
Furthermore, the top of the alternating current test piece is flush with the outer side of the top wall of the outer cavity.
Further, the material of the outer cavity is polyvinyl chloride or polymethyl methacrylate.
Furthermore, the outer wall of the polarization test piece is flush with the outer wall of the outer cavity.
The utility model has the advantages that:
1. the cathode protection test probe of the utility model adopts the hollow cylindrical polarization test piece to surround the test electrode, eliminates the voltage drop generated by the distance between the electrode and the test piece caused by the stray current in the soil seeds, and has the advantage of eliminating the interference of impurity current;
2. the cathode protection test probe of the utility model adopts a full solid structure, has no leakage, does not pollute the test piece and has more reliable test results;
3. the cathode protection test probe of the utility model adopts an all-solid-state sealing structure, so that copper sulfate solution does not need to be replaced, and a copper electrode does not need to be cleaned and derusted and is free from maintenance;
4. the cathode protection test probe of the utility model adopts a sealing structure, so that the copper electrode is not oxidized, the electrode is more stable, and the test precision is higher;
5. the cathode protection test probe of the utility model adopts a standard alternating current test piece with an exposed area of 1 square centimeter and a cylindrical polarization test piece, and is matched with a test instrument to simultaneously test the measurement of direct current electrified potential, power-off potential, direct current, alternating voltage and alternating current, and the direct current density and the alternating current density can be obtained through calculation to evaluate the cathode protection effect, the direct current interference state and the alternating current interference state of a protected structure, and the cathode protection test probe has a small structure and is convenient to carry in daily life;
6. the utility model discloses a cathodic protection test probe accessible changes drum length and obtains the different exposed area of polarization test block, and application scope is wide.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of a cathodic protection test probe according to the present embodiment.
Fig. 2 is a bottom view of the cathodic protection test probe of this example.
Fig. 3 is a top view of the cathodic protection test probe of this example.
In the figure: 1. an outer cavity; 2. polarizing the test piece; 3. an inner cavity; 5. A cavity; 6. an AC test piece; 8. copper sulfate crystals; 9. a copper electrode; 10. and testing the cable.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
In order to solve the problems of easy interference and copper sulfate solution penetration existing in the conventional portable cathodic protection test probe, the embodiment provides a cathodic protection test probe. Referring to fig. 1, 2 and 3, the cathodic protection test probe includes an outer cavity 1, a polarization test piece 2, an inner cavity 3, an ac test piece 6, a copper electrode 9 and a test cable 10. The alternating current test piece and the cylindrical polarization test piece are matched with a test instrument, so that direct current electrified potential, outage potential, direct current, alternating voltage and alternating current measurement can be simultaneously tested, direct current density and alternating current density can be obtained through calculation, and the cathode protection effect, the direct current interference state and the alternating current interference state of the protected structure are evaluated.
The polarization test block 2 of this embodiment is hollow cylinder, and this polarization test block 2 inlays and locates on the outer cavity outer wall, and interior cavity 3 is located outer cavity 1's inboard, and polarization test block 2 sets up with outer cavity 1 and interior cavity 3 are coaxial, and polarization test block 2 and outer cavity 1's outer wall fixed connection, and the outer wall of polarization test block 2 and outer cavity 1's outer wall parallel and level set up. The hollow cylindrical polarization test piece is adopted to surround the test electrode, so that the voltage drop caused by the distance between the electrode and the test piece due to the stray current in soil seeds is eliminated, and the method has the advantage of eliminating the interference of impurity current. Because the protected pipeline has different coating materials and coating qualities, test pieces with different areas are selected, the probe of the embodiment can obtain different exposed areas of the polarization test pieces by changing the length of the cavity, and the application range is wide.
The 3 leads of the test cable 10 are respectively connected with the copper electrode 9, the polarization test piece 2 and the alternating current test piece 6. The AC test piece 6 is embedded at the inner side of the top of the outer cavity 1, and the AC test piece 6 and the polarization test piece 2 are respectively led out to the bottom of the outer cavity through leads, and the three wires of the copper electrode are connected with a test cable to lead out the outer cavity so as to be convenient for testing.
The copper electrode 9 is inserted into the inner cavity of the inner cavity 3 from the center of the bottom of the outer cavity 1, and the copper electrode 9 is fixed with the outer cavity 1 and the inner cavity 3 in a sealing manner, and the sealing treatment is performed through sealant in the embodiment. Copper sulfate crystals 8 are filled between the copper electrode 9 and the inner wall of the inner cavity 3, the cathode protection test probe adopts an all-solid-state sealing structure, the problem that the copper sulfate solution needs to be replaced in the existing probe is solved, no leakage exists, the test piece is not polluted, the copper electrode does not need to be cleaned and derusted, and the test result is more reliable.
A cavity 5 for filling micro-seepage filler is arranged between the top of the inner cavity 3 and the top of the outer cavity 1, and the lower part of the cavity is communicated with the inner cavity 3. The upper part of the cavity is provided with a top cover which can be opened or closed. The copper sulfate crystal in the inner cavity is dissolved to form copper sulfate solution, the micro-seepage filler limits outward leakage of the copper sulfate solution so as to prevent the leaked solution from polluting the test piece, and simultaneously, the phenomenon that external solution enters the probe deeply to pollute copper sulfate in the probe is relieved.
The top of the ac test piece 6 of this embodiment is flush with the outer side of the top wall of the outer cavity 1, and the material of the outer cavity 1 is pvc or pmma.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (5)

1. A cathodic protection test probe is characterized by comprising an outer cavity (1), a polarization test piece (2), an inner cavity (3), an alternating current test piece (6), a copper electrode (9) and a test cable (10);
the polarization test piece (2) is in a hollow cylindrical shape, the polarization test piece (2) is embedded on the outer wall of the outer cavity (1), the polarization test piece (2) is fixedly connected with the outer wall of the outer cavity (1), and the polarization test piece (2), the outer cavity (1) and the inner cavity (3) are coaxially arranged;
the alternating current test piece (6) is embedded in the inner side of the top of the outer cavity (1);
the copper electrode (9) is inserted into the inner cavity of the inner cavity (3) from the center of the bottom of the outer cavity (1), and the copper electrode (9) is hermetically fixed with the outer cavity (1) and the inner cavity (3);
copper sulfate crystals (8) are filled between the copper electrode (9) and the inner wall of the inner cavity (3);
and 3 leads in the test cable (10) are respectively connected with the copper electrode (9), the polarization test piece (2) and the alternating current test piece (6).
2. The cathodic protection test probe according to claim 1, wherein a cavity (5) for filling micro-seeping filler is arranged between the top of the inner cavity (3) and the top of the outer cavity (1), the cavity (5) being in communication with the inner cavity (3).
3. The cathodic protection test probe according to claim 1, wherein the top of the ac coupon (6) is flush with the outside of the top wall of the outer cavity (1).
4. The cathodic protection test probe according to claim 1, wherein the material of the outer cavity (1) is polyvinyl chloride or polymethyl methacrylate.
5. The cathodic protection test probe according to claim 1, wherein the outer wall of the polarization test strip (2) is arranged flush with the outer wall of the outer cavity (1).
CN201920836341.0U 2019-06-05 2019-06-05 Cathode protection test probe Active CN210367917U (en)

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Application Number Priority Date Filing Date Title
CN201920836341.0U CN210367917U (en) 2019-06-05 2019-06-05 Cathode protection test probe
PCT/CN2019/110374 WO2020244107A1 (en) 2019-06-05 2019-10-10 Cathode protection test probe

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CN201920836341.0U CN210367917U (en) 2019-06-05 2019-06-05 Cathode protection test probe

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115248233A (en) * 2021-04-26 2022-10-28 中国石油天然气股份有限公司 Alternating current interference test probe and test method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT202100011345A1 (en) * 2021-05-04 2022-11-04 Cmp Group S R L Reference electrode for monitoring the cathodic protection of metallic structures, in particular underground and/or submarine structures

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Publication number Priority date Publication date Assignee Title
CN1020803C (en) * 1989-04-21 1993-05-19 中国科学院金属腐蚀与防护研究所 Probe for measuring negative offset of under ground pipe-line cathode protection protential and measuring method
CN2116970U (en) * 1991-11-22 1992-09-23 中国船舶工业总公司第七研究院七二五研究所 Long life buried copper and cupric sulfate reference electrode
US8926823B2 (en) * 2010-11-30 2015-01-06 Georges J. Kipouros Sub-coating coated metal corrosion measurement
CN202744630U (en) * 2012-07-12 2013-02-20 中国石油天然气股份有限公司 Long-acting polarization probe for pipeline cathodic protection
CN103540940B (en) * 2012-07-12 2015-08-12 中国石油天然气股份有限公司 Long-acting polarization probe for pipeline cathodic protection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115248233A (en) * 2021-04-26 2022-10-28 中国石油天然气股份有限公司 Alternating current interference test probe and test method

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WO2020244107A1 (en) 2020-12-10

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