CN101691661B - Potential detection device - Google Patents
Potential detection device Download PDFInfo
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- CN101691661B CN101691661B CN2009102357690A CN200910235769A CN101691661B CN 101691661 B CN101691661 B CN 101691661B CN 2009102357690 A CN2009102357690 A CN 2009102357690A CN 200910235769 A CN200910235769 A CN 200910235769A CN 101691661 B CN101691661 B CN 101691661B
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- ion
- pvc pipe
- ion selective
- permeable membranes
- selective permeable
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Abstract
The invention discloses a potential detection device, which belongs to the technical field of corrosion control for metal materials in natural environments. The device comprises test chips (1), ion selective permeable membranes (2), gel (3), a PVC pipe (4), a pure copper wire (5), saturated copper sulfate solution (6) and a measurement cable (7); the two test chips (1) are fixed in parallel and the measurement cable (7) is led out from the two test chips (1) respectively, and the test chips (1) are close to the ion selective permeable membranes (2) but are not contacted with the ion selectivepermeable membranes (2); the two ion selective permeable membranes (2) divide the PVC pipe (4) into two cavities, and the ion selective permeable membranes (2) and the PVC pipe (4) are sealed; and a reference half electric pair consisting of the pure copper wire (5) and the saturated copper sulfate solution (6) is formed in a cavity formed by the ion selective permeable membranes (2) and the blind end of the PVC pipe (4). The potential detection device has the advantages that the current of a test loop is low, so IR drop can be ignored; the two test chips are mutually spare, so the reliability of the device is improved; and the ion selective permeable membranes only allow ions to pass in single direction, so the permeation of electrolyte solution is reduced, and the ion selective permeable membranes have long service life and do not cause pollution to the test chips.
Description
Technical field
The invention belongs to technical field of corrosion control for metal materials in the physical environment, a kind of potential detection device particularly is provided, can eliminate IR and fall, measure protection potential in the corrosion control process in real time.
Technical background
By changing the effectively corrosion process of control material of the current potential of metallic structures in surrounding medium (water environment or soil environment).Current potential is the sign of corrosion control effect, also is the important parameter of corrosion control process self feed back foundation.
Usually the potential measurement method that adopts has certain distance between contrast electrode and tested works, and the surrounding medium between them has certain resistivity.According to Ohm law, electric current flows and can produce certain voltage drop in surrounding medium, and this voltage drop is called IR falls, and IR falls and is included in the measurement data.The electric current that applies in stray current in the surrounding medium or the corrosion control process all can produce IR and fall.
Current potential under the works different conditions has different intensions.The current potential that records when not applying the corrosion control measure is called spontaneous potential; Apply the corrosion control measure but do not eliminate the current potential that records when IR falls and be called the energising current potential; Apply the corrosion control measure and eliminated and apply the current potential that records when IR that electric current produces falls in the corrosion control process and be called switch-off potential; Apply the corrosion control measure and eliminated the current potential that records when whole IR fall and be called protection potential, the current potential the when current potential of just will switching on deduction IR falls.Protection potential is the foundation that corrosion control effect is judged, also is the self feed back parameter of foundation in the corrosion control process.
The corrosion control process is by applying the current potential that certain polarization current changes works, and the protection potential of works is constant in a numerical value that sets in advance, and just the current potential of works is polarised to the process of protection potential by spontaneous potential.Need in the control procedure protection potential numerical value is fed back to the systems control division branch in real time, and adjust the polarization current that applies automatically in view of the above, the change of electric current can cause the change of protection potential again, forms protection potential and the self feed back process that applies polarization current thus.
Apply IR that electric current produces and fall and to adopt outage to measure to eliminate, but the IR that stray current produces falls and can't adopt the outage method to eliminate.In the corrosion control process, applying electric current can not disconnect, thus the current potential that usual method records under this state actual be the energising current potential.For protection potential, it is a kind of deviation that the IR of this moment falls, and this deviation has uncertainty.
Probabilistic deviation is amplified in the self feed back process gradually, finally may cause the corrosion control failure.This deviation also can cause the erroneous judgement of corrosion control effect simultaneously.
For this problem of elimination that IR in the potential measurement process falls, research both at home and abroad is a lot, and the method for solution can be divided into two classes: a kind of is the distance that infinitely reduces between contrast electrode and the tested works, but the scene is difficult to carry out; Another kind is the method that adopts the polarization probe.
Polarization probe is placed in the suitable probe of structure by test piece and traditional micropore ceramics copper sulphate contrast electrode to be formed; can satisfy the protection potential Testing requirement; but owing to still need outage to measure, so can't satisfy the requirement of self feed back signal real-time online in the corrosion control process.
In addition, oozing out of copper ion is the traditional micropore ceramics copper sulphate contrast electrode of the influence key factor in serviceable life, contrast electrode as the use of polarization probe, chemical reaction also can take place with test piece (iron) in the copper ion that oozes out, change test piece surface chemistry composition, influence chemical property, and then the probe data mistake that causes polarizing.
Summary of the invention
The object of the present invention is to provide a kind of potential detection device; overcome that copper ion oozes out the shortcoming that reduces the life-span, pollutes test piece in the prior art; do not need in the corrosion control process to cut off the power supply but can eliminate the potential measurement that IR falls, satisfy the protection potential online in real time and measure and provide corrosion control process self feed back signal.
The present invention includes test pieces, ion permselective membrane, gel, pvc pipe, fine copper silk, copper sulphate saturated solution, measure cable.Two built-in testing sheets are by secured in parallel and draw the measurement cable respectively, and test pieces is close with the ion permselective membrane but do not contact.Two ion permselective membranes are divided into two cavitys to pvc pipe, the sealing of ion permselective membrane and pvc pipe, and the cavity between two ion permselective membranes is gel filled, is full of the identical electrolyte of zwitterion migration velocity in the gel.It is right that the cavity that ion permselective membrane and pvc pipe cecum form is formed reference half electricity by fine copper silk and copper sulphate saturated solution.
Structure collectivity of the present invention is that an end is fixed with two test pieces that be arranged in parallel, the other ends and draws the tube that 3 cables, inside are separated into two cavitys.Main structure body can be divided into three parts: the one, and it is right to be sealed in the potential reference electricity that forms in the airtight cavity that pvc pipe and ion permselective membrane form by spiral fashion fine copper silk and copper sulphate saturated solution, the ion permselective membrane only allows the unidirectional migration of negative ion, stop oozing out of the copper ion of knowing clearly, fine copper silk end passes the gland bonnet of pvc pipe end and draws a test cable; The 2nd, the electrolyte cavity of elimination liquid junction potential, by the confined space that two ion permselective membranes and pvc pipe are formed, electrolyte is by gel sets; The 3rd, test pieces is the substitute of tested metallic structures, and two built-in testing sheets be arranged in parallel and draw a test cable respectively, and a slice is used for measuring protection potential, and another sheet is used for measuring spontaneous potential, test pieces and ion permselective membrane near but do not contact.
To be that the electric current of test loop is little (generally be no more than 5 μ A/cm to advantage of the present invention
2), IR falls and can ignore; Two built-in testing sheets are standby each other, improve the reliability of device; The ion permselective membrane only allows ion unidirectional by having reduced the infiltration of electrolyte solution, and the life-span is grown and can not pollute test pieces.
Description of drawings
Fig. 1 is a structural representation of the present invention.Wherein, test pieces 1, ion permselective membrane 2, gel 3, pvc pipe 4, fine copper silk 5, copper sulphate saturated solution 6, measurement cable 7.
Fig. 2 for figure A-A to cut-open view.Wherein, test pieces 1, ion permselective membrane 2, pvc pipe 4, measurement cable 7.
Embodiment:
As shown in Figure 1, the present invention includes test pieces 1, ion permselective membrane 2, gel 3, pvc pipe 4, fine copper silk 5, copper sulphate saturated solution 6, measurement cable 7.Two built-in testing sheets are by secured in parallel and draw the measurement cable respectively, and test pieces is close with the ion permselective membrane but do not contact.Two ion permselective membranes are divided into two cavitys to pvc pipe, the sealing of ion permselective membrane and pvc pipe, and the cavity between two ion permselective membranes is full of the identical electrolyte of zwitterion migration velocity, and uses gel sets.It is right that the cavity that ion permselective membrane and pvc pipe cecum form is formed reference half electricity by fine copper silk and copper sulphate saturated solution.
With the close tested works of this device, test pieces is measured cable and is linked to each other with tested works during use, and the current potential of measuring test pieces gets final product.
Claims (3)
1. a potential detection device is characterized in that, this device comprises test pieces, ion permselective membrane, gel, pvc pipe, fine copper silk, copper sulphate saturated solution, measures cable; Two built-in testing sheets are by secured in parallel and draw the measurement cable respectively, and test pieces is close with the ion permselective membrane but do not contact; Two ion permselective membranes are divided into two cavitys to pvc pipe, ion permselective membrane and pvc pipe sealing; It is right that the cavity that ion permselective membrane and pvc pipe cecum form is formed reference half electricity by fine copper silk and copper sulphate saturated solution;
The ion permselective membrane only allows the unidirectional migration of negative ion, has stoped oozing out of copper ion, and fine copper silk end passes the gland bonnet of pvc pipe end and draws a test cable.
2. device according to claim 1 is characterized in that, cavity is separated by the ion permselective membrane.
3. device according to claim 1 and 2 is characterized in that, is full of the identical electrolyte of zwitterion migration velocity between the ion permselective membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102357690A CN101691661B (en) | 2009-10-22 | 2009-10-22 | Potential detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102357690A CN101691661B (en) | 2009-10-22 | 2009-10-22 | Potential detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101691661A CN101691661A (en) | 2010-04-07 |
| CN101691661B true CN101691661B (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102357690A Active CN101691661B (en) | 2009-10-22 | 2009-10-22 | Potential detection device |
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| CN (1) | CN101691661B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109856371A (en) * | 2019-04-18 | 2019-06-07 | 宁波高新区阶梯科技有限公司 | A kind of soil testing assemblies |
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- 2009-10-22 CN CN2009102357690A patent/CN101691661B/en active Active
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| CN101691661A (en) | 2010-04-07 |
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Owner name: QINGDAO NCS TESTING TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: CISRI QINGDAO MARINE CORROSION INSTITUTE Effective date: 20121109 |
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Effective date of registration: 20121109 Address after: Qingdao hi tech Development Zone Venture Center, 143-A Patentee after: Qingdao CISRI Nanogram Detection Protection Technology Co., Ltd. Address before: 266071 Shandong province Qingdao city fushansuo No. 727 Patentee before: CISRI Qingdao Marine Corrosion Institute |