CN210367462U - Bidirectional-migration conductive cement-based anode plate electrochemical dechlorination device - Google Patents
Bidirectional-migration conductive cement-based anode plate electrochemical dechlorination device Download PDFInfo
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- CN210367462U CN210367462U CN201921160872.9U CN201921160872U CN210367462U CN 210367462 U CN210367462 U CN 210367462U CN 201921160872 U CN201921160872 U CN 201921160872U CN 210367462 U CN210367462 U CN 210367462U
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Abstract
The utility model provides a two-way conductive cement base anode plate electrochemistry dechlorination device that migrates, include: an electrolytic cell unit comprising a DC power supply and an electrolyte; the concrete block is arranged in the electrolyte, a reinforcing steel bar is arranged in the concrete block, and the reinforcing steel bar is electrically connected to the negative electrode of the direct-current power supply and serves as the cathode of the electrolytic cell; the conductive cement-based anode plate is laid on one side surface of the concrete block and is positioned in the electrolyte, and a rust inhibitor is arranged in the conductive cement-based anode plate and is used as an anode of the electrolytic cell; add rust inhibitor in the electrically conductive cement base anode plate, rust inhibitor removes to the negative pole, sees through the concrete pore through the diffusion and transmits reinforcing bar surface formation adsorbed layer, makes the concrete more closely knit simultaneously to the protection reinforcing bar is corroded by chloride ion once more, the utility model discloses a dechlorination device dechlorination process is more high-efficient more thorough, and the time shortens 1-2 days, simple structure, the operation of being convenient for.
Description
Technical Field
The utility model belongs to the technical field of the electrochemistry is restoreed, concretely relates to electrically conductive cement base anode plate electrochemistry dechlorination device of two-way migration.
Background
As is well known, the durability and long-term service life of concrete structures have attracted extensive attention of experts and scholars as a primary consideration in the last decades, and studies have shown that alkali-aggregate reactions, sulfate attack, freeze-thaw cycles, and corrosion of reinforcing steel bars inside concrete all contribute to the deterioration of materials.
Corrosion of internal steel bars is one of the most important factors for reducing the service life of a concrete structure, and causes a great burden to the later maintenance budget of the concrete structure, once rusting occurs, the generation of corrosion products accumulated between the steel bars and concrete causes the volume occupied by the steel bars to be enlarged, when the corrosion products are accumulated enough and do not have enough space to accommodate the products, a concrete protective layer is cracked and peeled off, and if the section loss of the steel bars is serious, the problem of structural instability is greatly likely to occur.
At present, the metal mesh is used as an external anode to carry out electrochemical dechlorination on rusted reinforced concrete by an electrochemical method, so that harmful chloride ions in the concrete are moved out of the structure. However, the metal mesh has a great disadvantage as an external anode. For example, the titanium mesh is used as an anode, so that the cost is high, and the method is not suitable for practical engineering and the like; if a stainless steel net with wide sources is used as the anode, single dechlorination cannot meet the requirement of the buildings on the resistance to chlorine ion corrosion due to the corrosion tendency of the metal net, and metal corrosion substances can pollute the surface of the structure and affect the attractiveness. For some components with special shapes, the metal mesh is not easy to lay, and cannot form a closed loop with electrolyte, so that the dechlorination effect cannot be achieved.
Furthermore, despite the many advantages of the electrochemical dechlorination method, reinforcement corrosion still occurs in the treated concrete. Chloride ions are easily gathered at the gap between the external anode and the concrete block, and meanwhile, the concrete structure has the characteristic of porosity, so that the chloride ions are very easily diffused into the porous concrete in the environment polluted by chloride. In addition, the electrochemical dechlorination method can remove part of the total chloride ion amount in the concrete member, but can not completely remove the chloride ions in the concrete. Thus, small amounts of chloride from the environment can enter the concrete, causing the chloride ion content of the surface of the rebar to exceed the chloride ion threshold, resulting in "secondary corrosion" of the component.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a conductive cement base anode plate electrochemistry dechlorination device of two-way migration for solve and use the metal mesh as external positive pole at present, the price is expensive, easily corrodes, and the metal mesh is difficult to be laid and the inside residual chloride ion of concrete causes the secondary corrosion easily to the reinforcing bar, dechlorination not thorough problem.
In order to achieve the above object, the present invention provides the following technical solutions:
a bidirectional-migration conductive cement-based anode plate electrochemical dechlorination device is characterized by comprising:
the electrolytic cell device comprises a direct current power supply and electrolyte, wherein the direct current power supply is used for providing electric energy, and the current passes through the electrolyte to generate electrolytic reaction on a cathode and an anode;
the concrete block is arranged in the electrolyte, a reinforcing steel bar is arranged in the concrete block, the reinforcing steel bar is electrically connected to the negative electrode of the direct-current power supply, and the reinforcing steel bar is used as the cathode of the electrolytic cell;
and the conductive cement-based anode plate is laid on one side surface of the concrete block and is positioned in the electrolyte, an organic amine rust inhibitor is arranged in the conductive cement-based anode plate, and the conductive cement-based anode plate is connected with the positive electrode of the direct-current power supply and serves as the anode of the electrolytic cell.
In the electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate, preferably, an epoxy resin packaging part is arranged at the end part of the connection part of the reinforcing steel bar and the lead of the direct-current power supply.
In the electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate, preferably, the organic amine rust inhibitor is triethylene tetramine.
In the electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate, preferably, the conductive cement-based anode plate is a carbon fiber doped cement-based material.
In the electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate, preferably, the content of the carbon fiber in the conductive cement-based anode plate accounts for 0.8 percent of the volume of the cement-based material.
In the electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate, preferably, the electrolyte is a saturated calcium hydroxide solution.
In the electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate, preferably, the contact surface between the inner side surface of the conductive cement-based anode plate and the concrete block is a plane, and the shape and the size of the contact surface on the inner side surface of the conductive cement-based anode plate are the same.
In the electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate, preferably, the contact surface between the inner side surface of the conductive cement-based anode plate and the concrete block is a curved surface, and the area of the inner side surface of the conductive cement-based anode plate is not less than the area of the contact surface.
Compared with the closest prior art, the utility model provides a technical scheme has following excellent effect:
1. the utility model adopts the conductive cement-based anode plate containing the carbon fiber body as the main conductive phase as the external anode to carry out electrochemical dechlorination on the steel bar in the concrete, and the conductive cement-based anode has wide source and lower cost; the process is simple, the operation is convenient, the anode is suitable for all buildings, the external anode is easy to lay, and for some special-shaped structures, the thickness of the conductive cement-based anode plate can be adjusted and laid according to the shape of the member and the surrounding environment.
2. In order to further inhibit chloride ions from migrating to the surface of the steel bar, a migrating organic amine rust inhibitor is added into the conductive cement-based anode plate, the rust inhibitor moves to the position of the steel bar connected with the cathode, the chloride ions move to the surface of the concrete block, and ions in the concrete block migrate in two directions; the corrosion inhibitor can penetrate through concrete pores under the diffusion action and is transmitted to the surface of the reinforcing steel bar to form an adsorption protection layer, so that the reinforcing steel bar is protected from secondary corrosion.
Meanwhile, the rust inhibitor can fill gaps and micro cracks in the concrete in the process of migrating to the reinforcing steel bars, so that the concrete is more compact, and chloride ions migrating out of the concrete are prevented from migrating back again or being corroded by the chloride ions in the environment again.
Drawings
The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural diagram of the bidirectional-migration conductive cement-based anode plate electrochemical dechlorination device of the present invention.
In the figure: 1. a container; 2. an electrolyte; 3. reinforcing steel bars; 4. a conductive cement-based anode plate; 41. a carbon fiber body; 42. a rust inhibitor; 5. an epoxy resin encapsulation portion; 6. a direct current power supply.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, and may be, for example, either fixed or detachable; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
As shown in fig. 1, according to the embodiment of the utility model, the utility model provides a conductive cement base anode plate electrochemistry dechlorination device of two-way migration is provided, electrochemistry dechlorination device adopts the conductive cement base anode plate that contains the carbon fiber body as the positive pole, and add mobility organic amine rust inhibitor in conductive cement base anode plate, and adopt the reinforcing bar in the concrete piece as the negative pole, at dechlorination in-process, near the chloride ion migration of reinforcing bar near to the positive pole, keep away from the concrete piece, and rust inhibitor migrates to the negative pole, migrate to the reinforcing bar surface, rust inhibitor sees through the concrete hole through the diffusion, transmit reinforcing bar surface formation adsorption and protection layer, thereby the emergence of protection reinforcing bar prevents "secondary corrosion". Meanwhile, the rust inhibitor fills gaps and micro cracks in the concrete in the process of migrating to the reinforcing steel bars, so that the concrete is more compact, chloride ions migrating out of the concrete are prevented from migrating back again, and the effect of removing chloride from rusted reinforcing steel bars in the concrete is more sufficient.
The reaction principle of the electrochemical dechlorination device of the utility model is as follows: iron ions generated by rusting the steel bars are subjected to reduction reaction in the electrolytic cell, the iron ions are reduced into simple substance iron, chloride ions move to the anode in the electrolytic cell to generate oxidation reaction, and chlorine gas is generated to overflow the concrete, so that the effect of removing chlorine in the concrete is achieved.
The electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate in the embodiment specifically comprises:
the electrolytic cell device comprises a direct current power supply 6 and electrolyte 2, wherein the direct current power supply 6 is used for supplying electric energy, the current passes through the electrolyte 2 to carry out electrolytic reaction on a cathode and an anode, and the electrolyte 2 is placed in the container 1.
In the embodiment of the present invention, the electrolyte 2 is a saturated calcium hydroxide solution with good conductivity.
The concrete piece, the concrete piece is located in electrolyte 2, and the inside reinforcing bar 3 that is equipped with of concrete piece, reinforcing bar 3 electricity in the concrete piece are connected to DC power supply 6's negative pole, and reinforcing bar 3 all is as the negative pole of electrolytic cell.
And the conductive cement-based anode plate 4 is paved on one side surface of the concrete block and is positioned in the electrolyte 2, and the conductive cement-based anode plate 4 is connected with the positive electrode of the direct current power supply 6 and is used as the anode of the electrolytic cell.
In the embodiment of the present invention, the conductive cement-based anode plate 4 is made of carbon fiber 41 doped with cement-based material. The carbon fiber body 41 has high strength, high elastic modulus and good conductivity, is applied to a cement-based material to form a composite material with excellent conductivity, has wide source of the cement-based material, lower cost, simple process and convenient operation, is suitable for all buildings, including newly-built buildings or buildings which are rusted, and is suitable for being used as an anode material. The content of the carbon fiber body 41 in the conductive cement-based anode plate 4 accounts for 0.8% of the volume percentage of the cement-based material, and under the proportion, good conductivity can be ensured while the using amount of the carbon fiber body 41 is small.
The conductive cement-based anode plate 4 containing the carbon fiber body 41 as the external anode material is easy to lay, and for some special-shaped structures, the thickness of the conductive cement-based anode plate 4 can be adjusted and laid according to the shape of the concrete member and the surrounding environment. The surface of the conductive cement-based anode plate 4, which is contacted with the concrete block, is the inner side surface of the conductive cement-based anode plate 4, when the concrete member is a flat surface, the contact surface of the inner side surface of the conductive cement-based anode plate 4 and the concrete block is a plane, the shape and the size of the inner side surface of the conductive cement-based anode plate 4 and the contact surface are the same, and the conductive cement-based anode plate 4 is completely laid on the surface of the concrete block; when the concrete member is a curved surface, the contact surface between the inner side surface of the conductive cement-based anode plate 4 and the concrete block is a curved surface, the area of the inner side surface of the conductive cement-based anode plate 4 is not smaller than that of the contact surface, the current density can be improved by increasing the area of the anode electrode, the moving speed of chloride ions in the concrete block is improved, and the removal amount of the chloride ions is increased.
The utility model discloses an in the embodiment, reinforcing bar 3 all adopts the wire to be connected with DC power supply 6, reinforcing bar 3 with the tip of wire junction be equipped with epoxy encapsulation portion 5, prevent electric leakage and the corruption of electrolyte 2 to reinforcing bar 3.
The end part of the lead connecting part of the conductive cement-based anode plate 4 and the direct current power supply 6 is also provided with an epoxy resin packaging part 5 to prevent electric leakage.
Under the electrolysis, the chloride ion in the concrete piece mostly migrates to near the anode and escapes the concrete piece surface, but because space and gap in the middle of the concrete piece, the chloride ion among the surrounding environment erodes reinforcing bar 3 again easily, consequently in the embodiment of the utility model discloses a be provided with organic amine corrosion inhibitor 42 in anode material conductive cement base anode plate 4, organic amine corrosion inhibitor 42 is triethylene tetramine, and the content of corrosion inhibitor 42 accounts for cement base material volume percent and is 3% ~ 5%. Triethylene tetramine as an organic corrosion inhibitor moves to the cathode in the electrolytic cell, and passes through gaps of the concrete blocks through diffusion until the triethylene tetramine is transmitted to the surface of the reinforcing steel bar 3 to form an adsorption film protective layer, so that the reinforcing steel bar 3 is protected, secondary corrosion of the reinforcing steel bar 3 in the concrete after dechlorination is prevented, and secondary erosion of chloride ions is prevented. Meanwhile, in the process of migrating the rust inhibitor 42 to the steel bars 3, gaps and spaces inside the concrete can be filled, so that the concrete structure is more compact, chloride ions in the surrounding environment are further prevented from entering the concrete blocks, the anti-corrosion capability of the steel bars 3 is improved, and the service life of the member is prolonged.
When the electrochemical dechlorination device for the conductive cement-based anode plate 4 with bidirectional migration of the steel bar 3 concrete is used, firstly, the conductive cement-based anode plate 4 containing the carbon fiber body 41 and the triethylene tetramine rust inhibitor 42 is laid on the surface of a concrete block, the anode of the direct current power supply 6 is connected with the conductive cement-based anode plate 4, and the end part of the connecting part of the conductive cement-based anode plate 4 and a lead is packaged by epoxy resin; then connecting the reinforcing steel bar 3 with the negative electrode of the direct current power supply 6, and packaging the end part of the connecting part of the reinforcing steel bar 3 and the lead by using epoxy resin; during electrolytic dechlorination, chloride ions near the steel bars 3 migrate to the anode conductive cement-based anode plate 4, and the rust inhibitor 42 triethylene tetramine migrates to the cathode steel bars 3 through gaps of the concrete blocks to form bidirectional migration in the concrete, so that the dechlorination process in the concrete is finally completed. Compared with the dechlorination device without using a rust inhibitor, the utility model discloses a device dechlorination time will shorten 1-2 days.
In summary, the conductive cement-based anode plate containing the carbon fiber body and the rust inhibitor is used as an external anode for electrochemical dechlorination of the steel bar in the concrete, wherein the conductive cement-based anode plate has wide sources and lower cost; the process is simple, the operation is convenient, the external anode is suitable for all buildings, the external anode is easy to lay, and for some special-shaped structures, the thickness of the conductive cement-based anode plate can be adjusted and laid according to the shape of a component and the surrounding environment; meanwhile, the rust inhibitor added into the cement-based material can form a protective film on the surface of the steel bar, and the migration and diffusion of the rust inhibitor can enable the internal structure of the concrete to be more compact, prevent the further erosion of chloride ions and prevent the possibility that the concrete member is rusted for the second time after the chloride ions migrate.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A bidirectional-migration conductive cement-based anode plate electrochemical dechlorination device is characterized by comprising:
the electrolytic cell device comprises a direct current power supply and electrolyte, wherein the direct current power supply is used for providing electric energy, and the current passes through the electrolyte to generate electrolytic reaction on a cathode and an anode;
the concrete block is arranged in the electrolyte, a reinforcing steel bar is arranged in the concrete block, the reinforcing steel bar is electrically connected to the negative electrode of the direct-current power supply, and the reinforcing steel bar is used as the cathode of the electrolytic cell;
and the conductive cement-based anode plate is laid on one side surface of the concrete block and is positioned in the electrolyte, an organic amine rust inhibitor is arranged in the conductive cement-based anode plate, and the conductive cement-based anode plate is connected with the positive electrode of the direct-current power supply and serves as the anode of the electrolytic cell.
2. The electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate according to claim 1, wherein an epoxy resin packaging part is arranged at the end part of the connection part of the reinforcing steel bars and the lead of the direct-current power supply.
3. The electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate according to claim 1, wherein the organic amine rust inhibitor is triethylene tetramine.
4. The electrochemical dechlorination device of a bidirectional-migration conductive cement-based anode plate according to claim 1, wherein the conductive cement-based anode plate is a carbon fiber doped cement-based material.
5. The electrochemical dechlorination device of a bidirectional-migration conductive cement-based anode plate according to claim 1, wherein the electrolyte is a saturated calcium hydroxide solution.
6. The electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate according to claim 1, wherein the contact surface between the inner side surface of the conductive cement-based anode plate and the concrete block is a plane, and the shape and the size of the contact surface on the inner side surface of the conductive cement-based anode plate are the same.
7. The electrochemical dechlorination device for the bidirectional-migration conductive cement-based anode plate according to claim 1, wherein the contact surface between the inner side surface of the conductive cement-based anode plate and the concrete block is a curved surface, and the area of the inner side surface of the conductive cement-based anode plate is not less than the area of the contact surface.
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| CN201921160872.9U CN210367462U (en) | 2019-07-23 | 2019-07-23 | Bidirectional-migration conductive cement-based anode plate electrochemical dechlorination device |
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| CN201921160872.9U CN210367462U (en) | 2019-07-23 | 2019-07-23 | Bidirectional-migration conductive cement-based anode plate electrochemical dechlorination device |
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