CN113897614A - Device for measuring corrosion current density of outer wall coating of natural gas pipeline - Google Patents
Device for measuring corrosion current density of outer wall coating of natural gas pipeline Download PDFInfo
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- CN113897614A CN113897614A CN202111173772.1A CN202111173772A CN113897614A CN 113897614 A CN113897614 A CN 113897614A CN 202111173772 A CN202111173772 A CN 202111173772A CN 113897614 A CN113897614 A CN 113897614A
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- electrode
- pipeline
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- pipe
- electrodes
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000011248 coating agent Substances 0.000 title claims abstract description 21
- 238000000576 coating method Methods 0.000 title claims abstract description 21
- 238000005260 corrosion Methods 0.000 title claims abstract description 18
- 230000007797 corrosion Effects 0.000 title claims abstract description 18
- 239000003345 natural gas Substances 0.000 title claims abstract description 16
- 239000000523 sample Substances 0.000 claims abstract description 20
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 21
- 238000004210 cathodic protection Methods 0.000 claims description 14
- 229910052697 platinum Inorganic materials 0.000 claims description 11
- 239000000945 filler Substances 0.000 claims description 10
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 8
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 230000010287 polarization Effects 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 4
- 239000004800 polyvinyl chloride Substances 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000011152 fibreglass Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000003973 paint Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 7
- 239000010962 carbon steel Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C23F13/16—Electrodes characterised by the combination of the structure and the material
-
- 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
Landscapes
- 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)
Abstract
The invention belongs to the field of natural gas pipeline transportation safety, and particularly relates to a device for measuring corrosion current density of a coating on the outer wall of a natural gas pipeline, which is used in combination with an external pipeline cathode protection system and comprises a buckle (1), an electrode probe (2), a bolt (3) and a potentiostat (8); the clamp (1) bears the electrode probe (2) and is contacted and matched with the pipeline (9) through the bolt (3); the electrode probe (2) is used for acquiring a current signal flowing through the device, and the current is combined with the output current of the pipeline cathode protection system to calculate the coating corrosion current density of the outer wall of the pipeline. The device is convenient to install, simple to operate and low in cost, can measure the corrosion current density of the outer wall coating of the natural gas pipeline on line under the complex field condition, and has strong practicability.
Description
Technical Field
The invention belongs to the field of natural gas pipeline transportation safety, and particularly relates to a device for measuring corrosion current density of a coating on the outer wall of a natural gas pipeline, which is used in combination with an external pipeline cathode protection system.
Background
The 'development report of domestic and foreign oil and gas industry' in 2020 shows that with the clearness of the main economic body targets in the world, the structural changes of both sides of oil and gas supply and demand are deeply initiated, and the oil and gas industry is accelerating transformation and upgrading. In the five years in the future, the global oil and gas market will enter a change period, natural gas still serves as fossil energy with the fastest demand increase, a main network mainly comprising a western gas east transportation system, a Shaanjing pipeline system, a chuan gas east transportation system, a Zhonghai natural gas pipeline, a Yongtang Qin and a northeast natural gas pipe network is basically formed, and a national one-net gas supply pattern is formed. However, as the service life of each pipeline is gradually prolonged, the coating may be damaged, which not only affects the corrosion protection effect, but also may cause perforation seriously, thus threatening the service life and safety of the pipeline.
In the prior art, aiming at the condition that the coating on the outer wall of the pipeline is corroded, an instrument for directly measuring the corrosion current density of the coating on the outer wall of the pipeline does not exist, so that a device is necessary to be designed for measuring the corrosion current density of the coating on the outer wall of the pipeline in real time so as to master the operation condition of the pipeline and repair the damaged coating in due time.
Disclosure of Invention
The invention aims to provide a device for measuring corrosion current density of a coating on the outer wall of a natural gas pipeline, which is used in combination with an external cathode protection system. The device is convenient to install, easy to operate and low in cost, and can be used for measuring the corrosion condition of the outer wall coating of the pipeline additionally provided with the cathodic protection on line.
The technical scheme of the invention is as follows:
the invention provides a device for measuring corrosion current density of a pipeline outer wall coating, which is matched with an impressed current cathodic protection system for use, and comprises a buckle 1, an electrode probe 2, a bolt 3 and a potentiostat 8.
The top end of the electrode probe 2 is fixedly connected to the buckle 1, and the bottom end of the electrode probe is contacted with the outer wall of the pipeline; the buckle 1 is matched with the pipeline 9 through the bolt 3;
the electrode probe 2 comprises an insulating sheath 7 filled with insulating filler 6, and a detection electrode 4 and a pipe electrode 5 which are vertically arranged in the insulating sheath 7 and are insulated from each other;
the detection electrode 4 and the pipe electrode 5 are in contact with the internal environment of the pipeline 9, wherein the top end of the detection electrode 5 is respectively connected to the anode end and the reference electrode end of the potentiostat 8 through leads, and the top end of the pipe electrode 5 is connected to the cathode end of the potentiostat 8 through leads.
The detection electrode 4 and the pipe electrode 5 are positioned at the midpoint of the insulating filler, and the cross section area of the detection electrode is only 1cm2The adaptive pipeline is in a micro arc shape and tangent to the pipeline 9, and the insulating sheath 7 is adaptive to the detection electrode 4, the pipe electrode 5 and the pipeline 9 and tangent to the outer wall of the pipeline. The buckle 1 is a steel buckle coated with anticorrosive paint on the surface, or a buckle made of insulating materials, wherein the insulating materials include but are not limited to glass fiber reinforced plastics, polyvinyl chloride and polytetrafluoroethylene.
The material of the pipe electrode 5 is the same as that of the pipeline 9.
The detection electrode 4 is one or more electrodes with polarization resistance and stable potential, and is used for measuring the cathodic protection potential and current signals of the pipe electrode 5.
The detection electrode 4 is any one of the following electrode combinations:
1) a platinum electrode, or an Ag/AgCl electrode, or a stainless steel electrode;
2) platinum electrodes and Ag/AgCl electrodes;
3) platinum electrodes and stainless steel electrodes;
4) Ag/AgCl electrodes and stainless steel electrodes.
The detection electrode 4 and the pipe electrode 5 are both provided with cross sections of 1 +/-0.3 cm2The detection electrode 4 and the pipe electrode 5 are sealed in a hollow cylindrical insulating sheath 6 together, and the bottom end of each electrode is exposed out of the bottom surface of the insulating filler 7 after sealing.
The insulating filler 7 filled in the insulating sheath 6 is epoxy resin.
When the device is used in conjunction with a sacrificial anode cathodic protection system, the device further comprises an anode generated current sensor; an anode generated current sensor is connected in series with each sacrificial anode of the sacrificial anode cathodic protection system.
The invention provides a method for measuring the breakage rate of a coating on the outer wall of a natural gas pipeline by using the device, which is matched with an impressed current cathode protection system for use, and the method comprises the following steps:
1) circuit connection: the detection electrode 4 of the device is respectively connected with the anode end and the reference electrode end of a potentiostat 8, and the tube electrode 5 is connected with the cathode end of the potentiostat 8;
2) adjusting and measuring: adjusting the output current I of the potentiostat 82The difference value between the natural potential and the polarization potential of the tube electrode 5 is equal to the difference value between the natural potential and the polarization potential of the pipeline 9 in the cathode protection system of the pipeline 9;
3) calculating the corrosion current density: reading the output current I of the cathodic protection system of the pipeline 91Output current I of potentiostat 82Substituting the following corrosion current density i of the coating on the outer wall of the pipeline 9corrCalculating the formula: i.e. icorr＝(I2-I1) and/A, wherein A is the outer wall area of the pipeline 9.
Compared with the prior art, the invention has the beneficial effects that:
1. the device is simple and convenient to install, relatively simple in operation procedure, economical and practical, and can be used for various complicated field working environments.
2. The detection electrode of the electrode probe and the pipe electrode are lossless in working period, the design life is long, and the device does not need to be replaced as long as the pipeline is not replaced in general.
Drawings
FIG. 1 is a schematic sectional view of a device for measuring corrosion current density of an outer wall coating of a natural gas pipeline according to the present invention;
FIG. 2 is a schematic cross-sectional view of an electrode probe 2;
wherein:
1 fastener
2 electrode probe
3 bolt
4 detecting electrode
5 tube electrode
6 insulating sheath
7 insulating filler
8 constant potential rectifier
9 pipeline
Detailed Description
The invention is further described below with reference to the figures and examples.
The buckle 1 is a metal buckle, the surface of the metal buckle is coated with an anticorrosive coating, the size of the buckle is matched with the size of the pipe diameter of the measuring pipeline, and the buckle can also be made of insulating materials such as glass fiber reinforced plastics, polyvinyl chloride and polytetrafluoroethylene.
The electrode probe 2 is a bipolar probe, and is made of platinum and carbon steel respectively; the carbon steel is similar to most natural gas pipelines 10 in material, and the platinum has good polarization resistance, and can be replaced by materials with polarization resistance and stable potential, such as noble metal oxides and the like.
As shown in FIG. 2, in the electrode probe 2, the platinum electrode (detection electrode 4) and the carbon steel electrode (tube electrode 5) are both 1cm in cross-sectional area2The two electrodes are mutually insulated and are sealed in a hollow cylindrical PVC insulating sheath 6 together, the cavity of the sheath is filled and sealed by insulating filler 7 (epoxy resin), and the platinum electrode and the carbon steel electrode are only exposed out of the bottom surface of the insulating filler 7 after sealing.
The clamp 1 carries the electrode probe 2 and the pipeline 9, and is connected and matched with the bolt 3.
Further, the electrode probe 2 is used for measuring cathodic protection potential and current signals of the carbon steel electrode; for this purpose, but not limited to, a three-electrode probe such as one composed of an Ag/AgCl electrode, a platinum electrode and a carbon steel electrode, or one composed of an Ag/AgCl electrode, a stainless steel electrode and a carbon steel electrode may be used.
The invention relates to a device for measuring the corrosion current density of a coating on the outer wall of a natural gas pipeline, which is matched with an impressed current cathodic protection system for use, namely the device further comprises an anode generated current sensor: each sacrificial anode of the sacrificial anode cathodic protection system is connected with an anode generated current sensor in series, the sum of the measured currents is the output current of the pipeline cathodic protection system, if the number of the sacrificial anodes is large, the anode generated current sensors can be selected to be connected in series on a plurality of typical sacrificial anodes, the average number is obtained after the current values of the sacrificial anodes are measured, the average number is regarded as the generated current of a single sacrificial anode, and the result obtained by multiplying the generated current of the single sacrificial anode by the number of the anodes is the output current of the external cathode protection system. And finally, calculating the corrosion current density of the outer wall coating of the pipeline according to the output current of the potentiostat and the external surface area of the pipeline.
Claims (9)
1. The utility model provides a measure natural gas line outer wall coating corrosion current density's device, uses with impressed current cathodic protection system cooperation, its characterized in that: the device comprises a buckle (1), an electrode probe (2), a bolt (3) and a potentiostat (8);
the top end of the electrode probe (2) is fixedly connected to the buckle (1), and the bottom end of the electrode probe is tightly contacted with the outer wall of the pipeline (9); the buckle (1) is contacted and matched with the pipeline (9) through the bolt (3);
the electrode probe (2) comprises an insulating sheath (6) filled with insulating filler (7) and a detection electrode (4) and a pipe electrode (5) which are vertically arranged in the insulating sheath (6) and are insulated from each other;
the detection electrode (4) and the pipe electrode (5) are in contact with the outer wall environment of the pipeline (9), wherein the detection electrode (4) is respectively connected to an anode end and a reference electrode end of the potentiostat (8) through leads, and the pipe electrode (5) is connected to a cathode end of the potentiostat (8) through leads.
2. The apparatus of claim 1, wherein: the bottom ends of the detection electrode (4) and the pipe electrode (5) are parallel to the bottom surface of the insulating sheath (6).
3. The apparatus of claim 1, wherein: the buckle (1) is a steel buckle coated with anticorrosive paint on the surface, or is made of insulating materials, wherein the insulating materials include but are not limited to glass fiber reinforced plastics, polyvinyl chloride and polytetrafluoroethylene.
4. The apparatus of claim 1, wherein: the material of the pipe electrode (5) is the same as that of the pipeline (9).
5. The apparatus of claim 1, wherein: the detection electrode (4) is one or more electrodes made of polarization-resistant and potential-stable materials and is used for measuring cathodic protection potential and current signals of the pipe electrode (5).
6. The apparatus of claim 5, wherein: the detection electrode (4) is any one of the following electrode combinations:
1) a platinum electrode, or an Ag/AgCl electrode, or a stainless steel electrode;
2) platinum electrodes and Ag/AgCl electrodes;
3) platinum electrodes and stainless steel electrodes;
4) Ag/AgCl electrodes and stainless steel electrodes.
7. The apparatus of claim 1, wherein: the detection electrode (4) and the pipe electrode (5) are both provided with cross sections of 1 +/-0.3 cm2The detection electrode (4) and the pipe electrode (5) are sealed in a hollow cylindrical insulating sheath (6) together, and the bottom end of each electrode is exposed out of the bottom surface of the insulating filler (7) after sealing.
8. The apparatus of claim 1, wherein: and the insulating filler (7) filled in the insulating sheath (6) is epoxy resin.
9. The apparatus of any one of claims 1-8, wherein: when the device is used in conjunction with a sacrificial anode cathodic protection system, the device further comprises an anode generated current sensor; an anode generated current sensor is connected in series with each sacrificial anode of the sacrificial anode cathodic protection system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111173772.1A CN113897614A (en) | 2021-10-07 | 2021-10-07 | Device for measuring corrosion current density of outer wall coating of natural gas pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111173772.1A CN113897614A (en) | 2021-10-07 | 2021-10-07 | Device for measuring corrosion current density of outer wall coating of natural gas pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113897614A true CN113897614A (en) | 2022-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111173772.1A Pending CN113897614A (en) | 2021-10-07 | 2021-10-07 | Device for measuring corrosion current density of outer wall coating of natural gas pipeline |
Country Status (1)
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|---|---|
| CN (1) | CN113897614A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358094A (en) * | 2018-11-07 | 2019-02-19 | 青岛钢研纳克检测防护技术有限公司 | A kind of device and method measuring pipe internal coating breakage rate |
| CN209148579U (en) * | 2018-11-07 | 2019-07-23 | 青岛钢研纳克检测防护技术有限公司 | A kind of device measuring pipe internal coating breakage rate |
-
2021
- 2021-10-07 CN CN202111173772.1A patent/CN113897614A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358094A (en) * | 2018-11-07 | 2019-02-19 | 青岛钢研纳克检测防护技术有限公司 | A kind of device and method measuring pipe internal coating breakage rate |
| CN209148579U (en) * | 2018-11-07 | 2019-07-23 | 青岛钢研纳克检测防护技术有限公司 | A kind of device measuring pipe internal coating breakage rate |
Non-Patent Citations (1)
| Title |
|---|
| 代佳;李长俊;谢萍;: "西气东输二线X80管线钢内腐蚀行为的研究", 石油与天然气化工 * |
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Application publication date: 20220107 |