CN104120430A - Device for measuring two-dimensional potential distribution in gap under release coating - Google Patents
Device for measuring two-dimensional potential distribution in gap under release coating Download PDFInfo
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- CN104120430A CN104120430A CN201310152359.6A CN201310152359A CN104120430A CN 104120430 A CN104120430 A CN 104120430A CN 201310152359 A CN201310152359 A CN 201310152359A CN 104120430 A CN104120430 A CN 104120430A
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- base plate
- release coating
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- salt bridge
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Abstract
The invention relates to the field of metal corrosion measuring devices and specifically relates to a multi-channel potential measurer for measuring two-dimensional cathodic protection potential distribution under a release coating. The device for measuring the two-dimensional potential distribution in the gap under the release coating comprises a base plate and a cover plate which is arranged on the base plate and fixed with the base plate, wherein the gap is formed between the cover plate and the base plate; a solution region is arranged at one side of the cover plate; array type salt bridges are arranged at even intervals on the other side of the cover plate; an integrated rectangular test sample placement region is arranged on the base plate in a position corresponding to positions of the array type salt bridges. The device is capable of performing two-dimensional distribution measurement on the metal cathodic protection potential in the gap and monitoring in real time. The device has the advantages of small volume, simple structure, convenience in operation, high detection accuracy and the like.
Description
Technical field
The present invention relates to metallic corrosion measuring apparatus, is cathodic protection potential bivariate distribution hyperchannel potential test device under a kind of release coating specifically.
Background technology
Conventionally buried pipeline anticorrosion coating is not perfect to the buffer action of corrosive medium.In defect (pin hole, leak source etc.) and pipeline transportation, handling and construction process due to coated material itself, physical abuse is caused to coating in capital, and edatope effect around after pipeline is buried factors such as (as:) soil stress, cathode hydrogen evolutions, damage from third-party etc. all can cause the formation and spreading of holiday.The above results all can cause corrosion protection coating lose cohesive force and peel off, between pipe surface and coating, form gap, once the corrosive medium in environment (as underground water, oxygen, carbonic acid gas, sulfate ion, chlorion and microorganism etc.) infiltrates in gap, will form local corrosion microenvironment, just will cause gap interior conduit under release coating to corrode.
In prior art, often by surveying instruments such as volt ohm-milliammeters, metallic cathode protection potential one dimension in gap under release coating is distributed and measured; but fine gap can be thought a two-dimensional space by approximate conventionally, so the bivariate distribution that need to carry out current potential to it is measured.
Summary of the invention
The present invention is directed to above shortcomings part in prior art; the technical problem solving is to provide a kind of measuring apparatus of metallic cathode protection potential bivariate distribution in gap of simulating under release coating; adopt gap interior conduit under this device measuring release coating that the situation of corroding occurs, can change and carry out Real-Time Monitoring two-dimensional space inner potential under release coating.
In order to realize the problems referred to above of the present invention, the present invention adopts following technical scheme,
Metal current potential bivariate distribution measuring apparatus in gap under a kind of release coating, comprise base plate, be placed on base plate and with the fixing cover plate of base plate, between its cover plate and base plate, there is gap, described cover plate Yi Cewei solution district, on opposite side, evenly interval arranges array salt bridge, and on described base plate, the position of corresponding array salt bridge arranges Integral rectangular sample rest area.
In described solution district, be provided with a solution district supporting electrode connected with additional power source and be connected the solution district salt bridge that additional power source is used with one.
The two ends of cover plate and base plate are sealed and are fixed together by rivet, and the pad with thickness is set between cover plate and base plate, between cover plate and base plate, by pad, form slit region, and solution district communicates with slit region.
The number of described array salt bridge arranges N according to experiment specific requirement, in order to measure inner potential bivariate distribution in gap under release coating, changes.
The number N of array salt bridge is 64.
Described array salt bridge is arranged as 8 * 8 or 4 * 16.
The present invention has following advantage and beneficial effect:
1, the present invention can carry out bivariate distribution measurement to metallic cathode protection potential in gap, and carries out Real-Time Monitoring.
2, to have volume little, simple in structure, easy to operate for present device, accuracy of detection advantages of higher.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the structural representation of base plate in the present invention;
In figure, 1, cover plate; 2, base plate; 3, pad; 4, rivet; 5, array salt bridge; 6, solution district supporting electrode; 7, solution district salt bridge; 8, slit region; 9, solution district; 10, sample rest area.
Embodiment
Below in conjunction with accompanying drawing, structure of the present invention is described in detail.
Embodiment
As shown in Fig. 1 ~ 3, gap inner potential bivariate distribution measuring apparatus under release coating of the present invention, comprise base plate 2, be placed on base plate 2 and with the fixing cover plate 1 of base plate 2, between its cover plate 1 and base plate 2, there is slit region 8, cover plate 1 is fixed together by rivet 4 sealings with the two ends of base plate 2, and the pad 3 that between cover plate 1 and base plate 2, setting has thickness can gap.In the present embodiment, pad 3 adopts PTFE material.
As shown in Fig. 1,2 and 3, cover plate 1 Yi Cewei solution district 9, solution district 9 (see figure 3) that communicates with slit region 8, the array salt bridge 5(that on opposite side, evenly interval is provided with is shown in Fig. 1 and Fig. 2), between cover plate and base plate, the position of corresponding salt bridge is provided with Integral rectangular sample rest area 10, for placing the test button of monoblock.In the present embodiment, array salt bridge is 4 * 16 arrangements.In solution district 9, be provided with a solution district supporting electrode 6 connected with additional power source and be connected the solution district salt bridge 7 (seeing Fig. 1 and Fig. 2) that additional power source is used with one.
Use procedure of the present invention is as follows:
Adopting electrochemical measurement is mainly by the 10 encapsulation samples of sample rest area on base plate 2; sample rest area correspondence position encapsulation supporting electrode and salt bridge on cover plate 1; salt bridge outer contacting is connected with reference electrode; thereby form two electrode systems, finally metallic cathode protection potential in gap is carried out to two-dimensional measurement.
In the present invention, sample is selected carbon steel, pipe line steel X65, X70, X80, X100 etc. conventionally, also can test with other non-ferrous metal.
Claims (6)
1. gap inner potential bivariate distribution measuring apparatus under a release coating, it is characterized in that, comprise base plate, be placed on base plate and with the fixing cover plate of base plate, between its cover plate and base plate, there is gap, described cover plate Yi Cewei solution district, on opposite side, evenly interval arranges array salt bridge, and on described base plate, the position of corresponding array salt bridge arranges Integral rectangular sample rest area.
2. according to gap inner potential bivariate distribution measuring apparatus under release coating claimed in claim 1, it is characterized in that, in described solution district, be provided with a solution district supporting electrode connected with additional power source and be connected the solution district salt bridge that additional power source is used with one.
3. according to gap inner potential bivariate distribution measuring apparatus under release coating claimed in claim 1, it is characterized in that, the two ends of cover plate and base plate are sealed and are fixed together by rivet, the pad with thickness is set between cover plate and base plate, between cover plate and base plate, by pad, form slit region, solution district communicates with slit region.
4. according to metal corrosion test device in gap under release coating claimed in claim 1, it is characterized in that, the number of described array salt bridge arranges N according to experiment specific requirement, in order to measure inner potential bivariate distribution in gap under release coating, changes.
5. according to gap inner potential bivariate distribution measuring apparatus under release coating claimed in claim 1, it is characterized in that, the number N of array salt bridge is 64.
6. according to gap inner potential bivariate distribution measuring apparatus under release coating claimed in claim 5, it is characterized in that, described array salt bridge is arranged as 8 * 8 or 4 * 16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310152359.6A CN104120430B (en) | 2013-04-27 | 2013-04-27 | Inner potential Two dimensional Distribution measurement apparatus in gap under a kind of release coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310152359.6A CN104120430B (en) | 2013-04-27 | 2013-04-27 | Inner potential Two dimensional Distribution measurement apparatus in gap under a kind of release coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104120430A true CN104120430A (en) | 2014-10-29 |
| CN104120430B CN104120430B (en) | 2017-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310152359.6A Expired - Fee Related CN104120430B (en) | 2013-04-27 | 2013-04-27 | Inner potential Two dimensional Distribution measurement apparatus in gap under a kind of release coating |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398151A (en) * | 2019-01-02 | 2020-07-10 | 中国石油化工股份有限公司 | Interference corrosion test device for pipeline by alternating stray current |
| CN113533468A (en) * | 2021-07-02 | 2021-10-22 | 广东省科学院工业分析检测中心 | Preparation method of fence type array electrode |
| CN113983361A (en) * | 2021-09-15 | 2022-01-28 | 北京市燃气集团有限责任公司 | 3PE anticorrosive coating peeling and shielding risk judging method and device based on test piece |
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| US4504365A (en) * | 1982-11-01 | 1985-03-12 | The Kendall Company | Non-destructive cathodic disbondment testing of pipewrap coatings |
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| WO2002072917A2 (en) * | 2001-03-09 | 2002-09-19 | Southwest Research Institute | Disbonded coating cathodic protection monitoring coupon |
| CN202744629U (en) * | 2012-08-23 | 2013-02-20 | 中国科学院金属研究所 | Corrosion testing device for metal inside gaps under stripped coatings |
| CN203229575U (en) * | 2013-04-27 | 2013-10-09 | 中国科学院金属研究所 | Device for measuring two-dimensional potential distribution in gap under release coating |
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2013
- 2013-04-27 CN CN201310152359.6A patent/CN104120430B/en not_active Expired - Fee Related
Patent Citations (5)
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| US4504365A (en) * | 1982-11-01 | 1985-03-12 | The Kendall Company | Non-destructive cathodic disbondment testing of pipewrap coatings |
| CN1119739A (en) * | 1995-07-04 | 1996-04-03 | 厦门大学 | Metal/polymer composite material interface electric potential distribution measuring device |
| WO2002072917A2 (en) * | 2001-03-09 | 2002-09-19 | Southwest Research Institute | Disbonded coating cathodic protection monitoring coupon |
| CN202744629U (en) * | 2012-08-23 | 2013-02-20 | 中国科学院金属研究所 | Corrosion testing device for metal inside gaps under stripped coatings |
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| JIN XU ETAL: "The effects of sulfate reducing bacteria on corrosion of carbon steel Q235 under simulated disbonded coating by using electrochemical impedance spectroscopy", 《CORROSION SCIENCE》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398151A (en) * | 2019-01-02 | 2020-07-10 | 中国石油化工股份有限公司 | Interference corrosion test device for pipeline by alternating stray current |
| CN113533468A (en) * | 2021-07-02 | 2021-10-22 | 广东省科学院工业分析检测中心 | Preparation method of fence type array electrode |
| CN113533468B (en) * | 2021-07-02 | 2023-08-18 | 广东省科学院工业分析检测中心 | Preparation method of fence type array electrode |
| CN113983361A (en) * | 2021-09-15 | 2022-01-28 | 北京市燃气集团有限责任公司 | 3PE anticorrosive coating peeling and shielding risk judging method and device based on test piece |
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| CN104120430B (en) | 2017-08-11 |
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Granted publication date: 20170811 Termination date: 20180427 |