CN210166340U - An experimental device for real-time in-situ monitoring of ion concentration and electrochemical parameters - Google Patents
An experimental device for real-time in-situ monitoring of ion concentration and electrochemical parameters Download PDFInfo
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- CN210166340U CN210166340U CN201920843489.7U CN201920843489U CN210166340U CN 210166340 U CN210166340 U CN 210166340U CN 201920843489 U CN201920843489 U CN 201920843489U CN 210166340 U CN210166340 U CN 210166340U
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 238000011065 in-situ storage Methods 0.000 title claims description 20
- 238000000576 coating method Methods 0.000 claims abstract description 89
- 239000011248 coating agent Substances 0.000 claims abstract description 87
- 239000007788 liquid Substances 0.000 claims abstract description 70
- 238000003860 storage Methods 0.000 claims abstract description 61
- 239000000758 substrate Substances 0.000 claims abstract description 29
- 230000007797 corrosion Effects 0.000 claims abstract description 24
- 238000005260 corrosion Methods 0.000 claims abstract description 24
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 13
- 238000004088 simulation Methods 0.000 claims abstract description 12
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- 241000270722 Crocodylidae Species 0.000 claims description 45
- LNNWVNGFPYWNQE-GMIGKAJZSA-N desomorphine Chemical compound C1C2=CC=C(O)C3=C2[C@]24CCN(C)[C@H]1[C@@H]2CCC[C@@H]4O3 LNNWVNGFPYWNQE-GMIGKAJZSA-N 0.000 claims description 45
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- 229920001971 elastomer Polymers 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 6
- 239000011229 interlayer Substances 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000011247 coating layer Substances 0.000 claims description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 8
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 20
- 239000007864 aqueous solution Substances 0.000 description 13
- 239000000243 solution Substances 0.000 description 11
- 239000011780 sodium chloride Substances 0.000 description 10
- 230000000903 blocking effect Effects 0.000 description 9
- 230000005518 electrochemistry Effects 0.000 description 4
- 239000011253 protective coating Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- NPXOKRUENSOPAO-UHFFFAOYSA-N Raney nickel Chemical compound [Al].[Ni] NPXOKRUENSOPAO-UHFFFAOYSA-N 0.000 description 2
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Abstract
The utility model belongs to multilayer coating system's corruption and protection research field specifically are one kind and can realize the experimental apparatus of real-time normal position monitoring of block area ionic strength and each partial electrochemical parameter of system between multilayer coating system layer. The liquid storage tube in the device is horizontally arranged, the coating independent layer and the substrate with the connecting layer are respectively embedded in the inner side wall of the liquid storage tube between the top tube opening and the bottom tube opening of the liquid storage tube in a silicon rubber sealing mode, the coating independent layer and the substrate with the connecting layer are oppositely arranged, the substrate with the connecting layer or the coating independent layer serves as a working electrode, and a pipette is arranged above the liquid storage tube; the working electrode, the reference electrode and the counter electrode are arranged in the electrolytic cell to form a three-electrode system and are connected with corresponding interfaces of the electrochemical workstation. The utility model discloses a block area between simulation multilayer coating system layer can carry out normal position simulation monitoring to the ion concentration in the block area under the different corrosion stage, realizes the monitoring to each partial electrochemical parameter in whole corrosion process in ion diffusion and the system.
Description
Technical Field
The utility model belongs to multilayer coating system's corruption and protection research field specifically are one kind and can realize the experimental apparatus of real-time normal position monitoring of block area ionic strength and each partial electrochemical parameter of system between multilayer coating system layer.
Background
Multilayer coating systems have found extremely widespread use in numerous fields, such as: the organic protective coating system for the structural materials of ships and bridges is mostly composed of a plurality of layers of organic coatings such as bottom heavy-duty anticorrosion primer, intermediate paint of a connecting layer, surface weather-resistant paint and the like, and the inorganic abradable seal coating system for the air compressor of the aircraft engine also comprises an intermediate connecting layer of the abradable seal coating on the surface (such as a plasma spraying nickel-aluminum coating and the like) and a substrate. The coating layers composing the coating system have certain porosity and provide channels for corrosive media, and the corrosive media can penetrate through the surface layer and finally reach the substrate through the middle layer.
The diffusion of aggressive ions between the layers leads to failure of the coating and the protected metal substrate and the occurrence of occlusion zones in the coating system, which will have a significant influence on the electrochemical parameters of the coating system. Understanding the diffusion behavior of aggressive ions between layers in a multilayer coating system is critical to understanding the overall corrosion process and is also a breakthrough in capturing the service performance of the coating during service. In-situ testing is indispensable to explain the microscopic mechanism of failure of the protective coating system and to monitor the service performance of the coating in real time during the whole life cycle, but the current research on multi-layer protective coating systems is limited to the electrochemical monitoring of the whole coating system, and electrochemical detection means aiming at the diffusion behavior of aggressive ions among the layers in the coating system are lacked.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a can realize the experimental apparatus of the real-time normal position monitoring of each part electrochemical parameter of dead zone ion concentration and system between multilayer coating system layer for the real-time change condition of dead zone solution ion concentration between the multilayer coating system layer of research, and can link each part electrochemical parameter's of coating system change and the ion diffusion condition among the corrosion process, explain the microcosmic mechanism of multilayer coating system corrosion destruction in full life cycle.
The technical scheme of the utility model is that:
an experimental device for realizing real-time in-situ monitoring of ion concentration and electrochemical parameters comprises: electrolytic cell, pipette, rubber plug, take the base member of articulamentum, the independent layer of coating, liquid storage pipe, take crocodile electric clamp wire one, take crocodile electric clamp wire two, take crocodile electric clamp wire three, take crocodile electric clamp wire four, counter electrode, reference electrode, electrochemistry workstation, concrete structure is as follows:
the liquid storage tube is horizontally arranged, the coating single layer and the substrate with the connecting layer are respectively embedded in the inner side wall of the liquid storage tube between the top tube opening and the bottom tube opening of the liquid storage tube in a silicon rubber sealing mode, the coating single layer and the substrate with the connecting layer are oppositely arranged, the substrate with the connecting layer is connected with the first crocodile electric clamp lead and the second crocodile electric clamp lead outside the liquid storage tube, the coating single layer is connected with the third crocodile electric clamp lead outside the liquid storage tube, the substrate with the connecting layer or the coating single layer serves as a working electrode, and the selected working electrode is changed through the mutual connection of different leads; a pipette is arranged above the liquid storage tube, a liquid taking hole is arranged at the top of the side surface of the liquid storage tube, the liquid taking hole is plugged by a rubber plug, and the liquid storage tube is communicated with the pipette after the rubber plug is taken out; the working electrode, the reference electrode and the counter electrode are arranged in the electrolytic cell to form a three-electrode system and are connected with corresponding interfaces of the electrochemical workstation.
According to the experimental device for realizing the real-time in-situ monitoring of the ion concentration and the electrochemical parameters, a working electrode is connected with a working electrode through a first crocodile-carrying electric clamp lead, a second crocodile-carrying electric clamp lead, a third crocodile-carrying electric clamp lead and a fourth crocodile-carrying electric clamp lead, and the fourth crocodile-carrying electric clamp lead is always connected with a corresponding interface of an electrochemical workstation; the reference electrode is connected with the corresponding interface of the electrochemical workstation through a lead, and the counter electrode is connected with the corresponding interface of the electrochemical workstation through a lead.
The experimental device for realizing the real-time in-situ monitoring of the ion concentration and the electrochemical parameters has the advantages that the liquid storage tube is a hollow transparent organic glass tube, and the height of the liquid storage tube is not more than 10 mm; the bottom of the liquid storage tube is provided with a liquid taking hole which is connected with a pipette with the measuring range of 10-100 mul.
The experimental device for realizing the real-time in-situ monitoring of the ion concentration and the electrochemical parameters has the advantages that the outer diameter of the coating single layer and the substrate with the connecting layer are the same as the inner diameter of the liquid storage tube, the coating single layer and the substrate with the connecting layer are arranged at two ends of the inner wall of the liquid storage tube in parallel, a gap between the coating single layer and the substrate with the connecting layer and the liquid storage tube is tightly sealed by silicon rubber, and a hollow closed container consisting of the coating single layer, the substrate with the connecting layer and the liquid storage tube simulates an interlayer blocking area of a multilayer coating system and is used as a simulation.
According to the experimental device for realizing real-time in-situ monitoring of the ion concentration and the electrochemical parameters, a substrate with a connecting layer is connected with a first lead with a crocodile electric clamp and a second lead with a crocodile electric clamp outside a liquid storage tube, and the outer surface of the substrate in a simulation device is completely sealed by using silicon rubber; the single layer of the coating is connected with a third conductor with a crocodile electric clamp outside the liquid storage tube, only the interface of the third conductor with the crocodile electric clamp is sealed by silicon rubber to protect the interface and be electrically insulated from the external environment, and most of the outer surface of the single layer of the coating in the simulation device is in direct contact with a corrosive medium in the electrolytic cell.
According to the experimental device for realizing the real-time in-situ monitoring of the ion concentration and the electrochemical parameters, in a non-testing corrosion reaction stage, the first crocodile-containing electric clamp lead is always connected with the third crocodile-containing electric clamp lead, so that interlayer galvanic corrosion is simulated.
In the experimental device for realizing the real-time in-situ monitoring of the ion concentration and the electrochemical parameters, in the testing process, the second crocodile-containing electric clamp lead is connected with the fourth crocodile-containing electric clamp lead, the first crocodile-containing electric clamp lead is disconnected with the third crocodile-containing electric clamp lead, and the working electrode is a substrate with a connecting layer; or the third crocodile-carrying electric clamp lead is connected with the fourth crocodile-carrying electric clamp lead, the first crocodile-carrying electric clamp lead is disconnected with the second crocodile-carrying electric clamp lead, and the working electrode is a coating single layer; or the second crocodile-containing electric clamp lead is connected with the fourth crocodile-containing electric clamp lead, the first crocodile-containing electric clamp lead is connected with the third crocodile-containing electric clamp lead, and the working electrode is the whole coating system.
The utility model has the advantages and beneficial effects that:
1. the device of the utility model is simple to manufacture and use, can carry out in-situ simulation monitoring on the ion concentration in the blocking area under different corrosion stages by simulating the blocking area among the multi-layer coating system layers, and realizes the ion diffusion (such as Cl) in the whole corrosion process-、H+And metal ions, etc.), metal, electrochemical parameters of the coating are monitored and detected in real time.
2. The utility model discloses can link the change of each partial electrochemical parameter of coating system with the ion diffusion condition among the corrosion process to further provide clue and inspiration for the corrosion mechanism theoretical research of multilayer coating system, realize that the real-time normal position electrochemistry supervision of block area ion concentration and each partial electrochemical parameter of system detects between multilayer coating system layer.
Drawings
Fig. 1 is a schematic structural diagram of an experimental device for real-time in-situ monitoring of ion concentration in an interlayer blocking region of a multilayer coating system and electrochemical parameters of each part of the system.
In the drawings, the components represented by the respective reference numerals are listed below: 1. the device comprises an electrolytic cell, 2. a lead, 3. a pipette, 4. a rubber plug, 5. a substrate with a connecting layer, 6. a coating single layer, 7. a liquid storage tube, 8. a first crocodile-containing electric clamp lead, 9. a second crocodile-containing electric clamp lead, 10. a third crocodile-containing electric clamp lead, 11. a fourth crocodile-containing electric clamp lead, 12. a counter electrode, 13. a reference electrode, 14.3.5 wt% NaCl aqueous solution and 15. an electrochemical workstation.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in figure 1, the utility model relates to a realize real-time normal position test's of dead zone ion concentration between multilayer coating system layer experimental apparatus, the device includes: the device comprises an electrolytic cell 1, a lead 2, a pipette 3, a rubber plug 4, a substrate 5 with a connecting layer, a coating single layer 6, a liquid storage tube 7, a first lead with crocodile electric clamp 8, a second lead with crocodile electric clamp 9, a third lead with crocodile electric clamp 10, a fourth lead with crocodile electric clamp 11, a counter electrode 12, a reference electrode 13, a 3.5 wt% NaCl aqueous solution 14, an electrochemical workstation 15 and the like, and has the following specific structure:
The working electrode, the reference electrode 13 and the counter electrode 12 are arranged in the electrolytic cell 1 to form a three-electrode system and are connected with corresponding interfaces of the electrochemical workstation 15. The working electrode changes the connection mode with a fourth conducting wire 11 with the crocodile through a first conducting wire 8 with the crocodile electric clamp, a second conducting wire 9 with the crocodile electric clamp and a third conducting wire 10 with the crocodile electric clamp, and the fourth conducting wire 11 with the crocodile electric clamp is connected with a corresponding interface of the electrochemical workstation 15 all the time; the reference electrode 13 is connected with a corresponding interface of the electrochemical workstation 15 through a lead 2, and the counter electrode 12 is connected with a corresponding interface of the electrochemical workstation 15 through the lead 2.
The liquid storage tube 7 is a hollow transparent organic glass tube, and the height of the liquid storage tube is not more than 10 mm; the bottom of the liquid storage tube 7 is provided with a liquid taking hole which is connected with a pipette 3 with the measuring range of 10-100 mul; the pipette 3 takes no more than 5% of the volume of the solution in the reservoir 7 at a time to ensure that the volume of the solution taken has a negligible effect on the ion concentration in the occlusion.
The outer diameter of the coating single layer 6 and the base body 5 with the connecting layer are the same as the inner diameter of the liquid storage tube 7, the coating single layer 6 and the base body 5 with the connecting layer are arranged at two ends of the inner wall of the liquid storage tube 7 in parallel relatively, a gap between the coating single layer 6 and the base body 5 with the connecting layer and the liquid storage tube 7 is sealed by silicon rubber, and a hollow closed container consisting of the coating single layer 6, the base body 5 with the connecting layer and the liquid storage tube 7 simulates an interlayer blocking area of a multilayer coating system and is used as a simulation device; the matrix 5 with the connecting layer is connected with a first lead 8 with a crocodile electric clamp and a second lead 9 with a crocodile electric clamp outside the liquid storage tube 7, and the outer surface of the matrix in the simulation device is completely sealed by silicon rubber to avoid contacting with a 3.5 wt% NaCl aqueous solution 14 of a corrosive medium in the electrolytic cell 1; the single coating layer 6 is connected with a third conductor 10 with an alligator electric clamp outside the liquid storage tube 7, only the interface of the third conductor 10 with the alligator electric clamp is sealed by silicon rubber to protect the interface and be electrically insulated from the external environment, and most of the outer surface of the single coating layer 6 in the simulation device is directly contacted with a 3.5 wt% NaCl aqueous solution 14 of a corrosive medium in the electrolytic cell 1.
In the non-test corrosion reaction stage, a first crocodile-carrying electric clamp lead 8 is connected with a second crocodile-carrying electric clamp lead 10 all the time, so that interlayer galvanic corrosion is simulated, ① the second crocodile-carrying electric clamp lead 9 is connected with a fourth crocodile-carrying electric clamp lead 11, the first crocodile-carrying electric clamp lead 8 is disconnected with the third crocodile-carrying electric clamp lead 9, the working electrode is a substrate 5 with a connecting layer, a corrosion medium is a blocking area solution (namely a solution in a liquid storage pipe 7), ② the third crocodile-carrying electric clamp lead 10 is connected with the fourth crocodile-carrying electric clamp lead 11, the first crocodile-carrying electric clamp lead 8 is disconnected with the second crocodile-carrying electric clamp lead 9, the working electrode is a coating single layer 6, the corrosion medium is a blocking area solution and a raw solution in an electrolytic cell 1 (namely a NaCl aqueous solution with the concentration of 3.5 wt%), ③ the second crocodile-carrying electric clamp lead 9 is connected with the fourth crocodile-carrying electric clamp lead 11, the first crocodile-carrying electric clamp lead 8 and the third crocodile-carrying electric clamp lead 10, the aqueous solution is a NaCl aqueous solution in the electrolytic cell 1 (namely a NaCl aqueous solution with the inner layer of the coating single layer), the inner layer, namely a NaCl aqueous solution of the coating system, the aqueous solution of the blocking area system (namely a NaCl solution of the inner layer), the inner layer of the electrolytic cell 5) is a multi-layer, the aqueous solution of the electrolytic cell, the inner layer of the aqueous solution of the electrolytic cell.
As shown in fig. 1, the utility model discloses the concrete simulation process that realizes the real-time normal position monitoring of ion concentration and electrochemical parameter is:
firstly, connecting an experimental device, connecting a first 8 with crocodile electric clamp lead with a third 10 with crocodile electric clamp lead, and pouring a 3.5 wt% NaCl aqueous solution 14 into an electrolytic cell 1; then, at different stages of corrosion, a liquid taking hole of the pipette 3 is used for extending into the liquid storage tube 7, a small amount of solution in the occlusion area (less than 5% of the volume of the solution in the liquid storage tube 7) is extracted, and the influence on the ion concentration in the simulated occlusion area is negligible due to the small amount of solution extracted by the pipette 3 each time; diluting the extracted corrosive medium to a specified volume, and carrying out H treatment on the corrosive medium by using an ion chromatograph+、Al3+、Cl-、SO4 2-The plasma concentration (depending on the element types of the corrosion medium, the coating independent layer and the substrate) is subsequently detected, and the real-time in-situ monitoring of the ion concentration in the blocking area is realized; meanwhile, the electrochemical parameters of the coating single layer 6, the substrate 5 with the connecting layer and the whole coating system under the corresponding ion concentration are respectively measured in the ways of disconnecting and connecting different leads as described above, so as to obtain the change of the electrochemical parameters related to ion diffusion in the reaction process; the change of the electrochemical parameters of each part of the coating system is related to the ion diffusion condition in the corrosion process, thereby further providing clues and suggestions for the theoretical research of the corrosion mechanism of the multilayer coating system.
The result shows, the utility model provides an experimental apparatus for real-time in-situ monitoring of each partial electrochemistry parameter of block area ion concentration between multilayer coating system layer and system. The device carries out experimental research on ion diffusion, acidification and corrosive ion enrichment between the surface layer and the connecting layer or between the surface layer and the matrix in the multilayer coating system, and links the change of electrochemical parameters of each part of the coating system with the ion diffusion condition in the corrosion process, thereby explaining the microscopic mechanism of corrosion damage of the multilayer coating system in the whole life cycle, and having important significance on the corrosion and protection of all the current multilayer coating systems.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920843489.7U CN210166340U (en) | 2019-06-05 | 2019-06-05 | An experimental device for real-time in-situ monitoring of ion concentration and electrochemical parameters |
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| CN201920843489.7U CN210166340U (en) | 2019-06-05 | 2019-06-05 | An experimental device for real-time in-situ monitoring of ion concentration and electrochemical parameters |
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| CN210166340U true CN210166340U (en) | 2020-03-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146560A (en) * | 2019-06-05 | 2019-08-20 | 中国科学院金属研究所 | An experimental device for real-time in-situ monitoring of ion concentration and electrochemical parameters |
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2019
- 2019-06-05 CN CN201920843489.7U patent/CN210166340U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146560A (en) * | 2019-06-05 | 2019-08-20 | 中国科学院金属研究所 | An experimental device for real-time in-situ monitoring of ion concentration and electrochemical parameters |
| CN110146560B (en) * | 2019-06-05 | 2024-01-19 | 中国科学院金属研究所 | Experimental device for realizing real-time in-situ monitoring of ion concentration and electrochemical parameters |
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