Flexible anode and anti-corrosion device

Abstract

The invention provides a flexible anode and an anti-corrosion device, and relates to the technical field of anti-corrosion, in order to solve the problem that in the prior art, an anode coating is prone to falling off due to long-term scouring of a medium in a container, the flexible anode comprises an anode body, the anode body comprises a flexible base body and a coating, the flexible base body is of a flexible long-strip-shaped structure, and the coating is arranged on the flexible base body. The coating is coated on the outer surface of the flexible substrate; the flexible sleeve is arranged on the outer side of the anode body in a sleeving mode in the length direction of the anode body, a plurality of through holes are formed in the flexible sleeve, and anode current can be output to the outer side of the flexible sleeve from the interior of the flexible sleeve through the through holes. According to the flexible anode, the flexible sleeve is arranged on the outer side of the anode body in a sleeving mode, the flexible sleeve can relieve impact of a fluid medium in the device on the anode body, the situation that a coating on the surface of the anode body falls off due to long-term scouring of a container and a medium in a pipeline can be avoided, and the service life of the flexible anode is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of corrosion protection, and in particular to a flexible anode and an corrosion protection device. Background Art

[0002] The existing anti-corrosion measures for steel containers and the inner walls of pipelines such as heaters, pressure vessels, condensers, water treatment devices and metal tanks generally adopt coating and cathodic protection. Among them, the cathodic protection methods include sacrificial anode cathodic protection and impressed current cathodic protection. The sacrificial anode protection method is usually used to protect containers with small volume and small required protection current. Generally, the total protection current is less than 1A. The selection of sacrificial anodes needs to consider the ambient temperature of the medium in the container and pipeline, and it is not easy to replace. The impressed current cathodic protection method has a wide range of applications, is not restricted by conditions, is easy to replace later, and has high applicability and flexibility.

[0003] The selection and arrangement of auxiliary anodes in impressed current cathodic protection technology are the key to corrosion protection. Since steel containers and pipelines are closed spaces with limited space, auxiliary anodes are mostly selected with small size, large discharge density and long service life. In the impressed current cathodic protection system, the protective current released by the auxiliary anode is absorbed by the protected steel structure through the corrosive medium in which the protected steel structure is located. For example, the buried steel pipeline with impressed current cathodic protection system absorbs the protective current released by the auxiliary anode through the soil.

[0004] In the prior art, the auxiliary anodes in the impressed current cathodic protection technology for the inner wall of steel containers and pipelines are mostly probe anodes. The main body of the probe anode is a mixed metal oxide (MMO) rod anode. The MMO anode has the advantages of low consumption rate and long life. For example, the probe anode disclosed in the patent documents with publication numbers CN104328440A, CN108468052A, and CN207632893U is generally fixed to the container and pipeline wall through a fastening device, a base device, and a hole in the container and pipeline wall. The MMO anode is connected to the positive electrode of the power supply equipment of the cathodic protection system through a cable.

[0005] As for the auxiliary anode in the form of the probe mentioned above, on the one hand, the MMO auxiliary anode is in direct contact with the medium in the container and the pipeline, and the MMO coating on the surface of the auxiliary anode is easily peeled off due to the long-term scouring of the medium in the container, which affects the life of the MMO auxiliary anode; on the other hand, there is a mixed zone of liquid and gas phases above the medium in the container and the pipeline, and this area is easily affected by changes in environmental conditions, atmospheric corrosion in dry conditions and electrochemical corrosion in humid conditions. It cannot absorb sufficient protection current through the medium in the steel container and the pipeline, and is prone to under-protection, thereby causing corrosion; furthermore, the protection range of the probe anode is limited, and it cannot provide good protection for the inner wall of the accessories of the pressure vessel. The accessories of the steel container include medium inlet, medium outlet, inspection port, drain port, flange and other components. Since these accessories are structures protruding from the side wall of the steel container shell, the protection current released by the auxiliary anode flows inside the steel container through the medium, and the inner walls of these accessories cannot absorb sufficient protection current and are prone to corrosion. Summary of the invention

[0006] The purpose of the present invention is to provide a flexible anode and an anti-corrosion device to solve the problem in the prior art that the anode coating is easily eroded by the medium in the container for a long time and falls off. The flexible anode of the present invention can prevent the coating on the surface of the anode body from falling off due to long-term erosion by the medium in the container and the pipeline, thereby ensuring the service life of the flexible anode.

[0007] The present invention provides a flexible anode, comprising: An anode body, the anode body comprising a flexible substrate and a coating, the flexible substrate is a flexible long strip structure, and the coating is coated on the outer surface of the flexible substrate; A flexible sleeve is sleeved on the outside of the anode body along the length direction of the anode body, and a plurality of through holes are arranged on the flexible sleeve, through which the anode current can be output from the inside of the flexible sleeve to the outside of the flexible sleeve.

[0008] As a preferred solution of the present invention, the plurality of through holes are evenly distributed along the length direction of the flexible sleeve, and the through holes include first direction holes and second direction holes, and the first direction holes and the second direction holes are vertically arranged in the circumferential direction of the flexible sleeve.

[0009] As a preferred solution of the present invention, the flexible sleeve is a plastic tube.

[0010] As a preferred solution of the present invention, the flexible substrate is a titanium wire, and the coating is a mixed metal oxide coating.

[0011] As a preferred solution of the present invention, it further comprises an anode fixing device, wherein the anode fixing device is respectively connected to both ends of the flexible sleeve.

[0012] As a preferred solution of the present invention, the anode fixing device includes a first connecting tube and a second connecting tube, the first connecting tube and the second connecting tube are connected by a flange, the flexible anode is arranged through the first connecting tube and the second connecting tube, the second connecting tube is provided with a radial locking bolt, and the anode body is connected to the locking bolt.

[0013] As a preferred solution of the present invention, it further comprises a first cable, which is arranged through the flexible sleeve along the length direction of the anode body and connected to the anode body through a plurality of first connection points.

[0014] The present invention also provides an anti-corrosion device, comprising the flexible anode, wherein the flexible anode is installed in the anti-corrosion device and connected to the anti-corrosion device through the anode fixing device.

[0015] As a preferred solution of the present invention, the anti-corrosion device is a container or a pipe, and the flexible anode is arranged in a ring shape along the circumference of the inner wall of the container or the pipe and is connected to the inner wall of the container or the pipe through a plurality of fixing buckles.

[0016] As a preferred solution of the present invention, it also includes a second cable, which is respectively connected to the anode body of the flexible anode or the two ends of the first cable through a second connection point, the second connection point is located in a second connecting tube, and the second connecting tube is insulated and sealed by potting glue.

[0017] Compared with the prior art, the present invention has the following positive effects: The flexible anode provided by the present invention comprises an anode body, wherein the anode body comprises a flexible substrate and a coating, wherein the flexible substrate is a flexible long strip structure, and the coating is applied to the outer surface of the flexible substrate; and a flexible sleeve, wherein the flexible sleeve is sleeved on the outer side of the anode body along the length direction of the anode body, and a plurality of through holes are arranged on the flexible sleeve, and the anode current can be output from the inside of the flexible sleeve to the outside of the flexible sleeve through the through holes. The flexible anode of the present invention is configured as a flexible substrate and a coating structure, and the anode body is in a flexible long strip shape, so that it can bend along its inner wall in a container or a pipe, and the length of the anode body in the container or the pipe is increased, so that the inner wall of the container and the pipe can be fully protected. The flexible long strip structure of the anode body enables it to be applicable to a variety of devices for impressed current cathodic protection, and its arrangement can be adjusted according to the shape of the device, with high installation flexibility and a wide range of adaptability. Furthermore, the flexible anode is provided with a flexible sleeve sleeved on the outside of the anode body. The flexible sleeve can reduce the impact of the fluid medium in the device on the anode body, thereby protecting the coating on the anode body. The flexible sleeve can prevent the coating on the surface of the anode body from falling off due to long-term erosion by the medium in the container and the pipeline, thereby ensuring the service life of the flexible anode and solving the problem in the prior art that the mixed metal oxide anode coating of the probe anode is easily eroded by the medium on the inner wall of the container and the pipeline and easily falls off. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic structural diagram of a flexible anode according to a first embodiment of the present invention; Figure 2 This is a schematic structural diagram of a flexible anode according to a second embodiment of the present invention; Figure 3 A radial cross-sectional view of the flexible anode of the present invention when installed in a pipe or a container; Figure 4 This is an axial cross-sectional view of the flexible anode of the present invention when installed in a pipe or a container. In the figure: 1, anode body; 11, coating; 12, flexible substrate; 2, flexible sleeve; 3, through hole; 31, first direction hole; 32, second direction hole; 4, anode fixing device; 41, first connecting pipe; 42, flange; 43, bolt; 44, second connecting pipe; 45, locking bolt; 51, first connection point; 52, second connection point; 6, pipeline; 71, first cable; 72, second cable; 8, fixing buckle. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be noted that, unless otherwise specified, "plurality" means two or more than two; the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "front end", "back end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplification, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0022] The specific implementation modes of the present invention are further described in detail below with reference to the accompanying drawings.

[0023] Embodiment 1: This embodiment provides a flexible anode, such as Figure 1-Figure 4 As shown, it includes an anode body 1 and a flexible sleeve 2.

[0024] The anode body 1 includes a flexible substrate 12 and a coating 11. The flexible substrate 12 is a flexible long strip structure, and the coating 11 is coated on the outer surface of the flexible substrate 12. The flexible substrate 12 can be a metal strip. The coating 11 serves as the anode body.

[0025] The flexible sleeve 2 is sleeved on the outside of the anode body 1 along the length direction of the anode body 1, and a plurality of through holes 3 are provided on the flexible sleeve 2, and the anode current can be output from the flexible sleeve 2 to the outside of the flexible sleeve 2 through the through holes 3. The through holes 3 facilitate the output of the anode current and ensure that the inner wall of the protected device (such as a container and a pipeline) absorbs sufficient protection current. Among them, the through hole 3 can be a circular hole, a square hole, etc. Preferably, the through hole 3 is a circular hole to reduce the disturbance to the fluid. The length of the flexible sleeve 2 can be equal to the length of the anode body 1. The diameter of the flexible sleeve 2 is designed according to the diameter of the anode body 1, so that the inner diameter of the flexible sleeve 2 is larger than the outer diameter of the anode body 1, and the flexible sleeve 2 is sleeved on the outside of the anode body 1 and there is a gap between the flexible sleeve 2 and the anode body 1, so that the anode body 1 releases the anode current.

[0026] The flexible anode of this embodiment is achieved by configuring the anode body 1 to have a flexible substrate 12 and a coating 11 structure. The anode body 1 is in the shape of a flexible long strip, so that it can bend along the inner wall of a container or a pipe, thereby increasing the installation length in the container or the pipe, and can fully protect the inner wall of the container and the pipe. The flexible long strip structure of the anode body 1 enables it to be suitable for use in a variety of devices for impressed current cathodic protection, and its arrangement can be adjusted according to the shape of the device, with high installation flexibility and a wide range of adaptability.

[0027] Furthermore, the flexible anode in the present embodiment is sleeved on the outside of the anode body 1 by setting a flexible sleeve 2. The flexible sleeve 2 can reduce the impact of the fluid medium in the device on the anode body 1, thereby protecting the coating on the anode body 1. The flexible sleeve 2 can prevent the coating on the surface of the anode body 1 from falling off due to long-term erosion by the medium in the container and the pipeline, thereby ensuring the service life of the flexible anode and solving the problem in the prior art that the mixed metal oxide anode of the probe anode is easily eroded by the medium on the inner wall of the container and the pipeline and easily falls off.

[0028] As a preferred embodiment, the plurality of through holes 3 are evenly distributed along the length direction of the flexible sleeve 2. The through holes 3 include a first direction hole 31 and a second direction hole 32, and the first direction hole 31 and the second direction hole 32 are vertically arranged in the circumferential direction of the flexible sleeve 2. Two first direction holes 31 and two second direction holes 32 are arranged in the same circumferential direction of the flexible sleeve 2, and the first direction hole 31 and the second direction hole 32 are arranged at 90 degrees, so as to facilitate the multi-directional output of the anode current.

[0029] As a preferred embodiment, the flexible sleeve 2 is a plastic tube. The flexible sleeve 2 can be a round tube or a square tube. Preferably, the flexible sleeve 2 is a round tube to reduce the resistance to the fluid. The flexible sleeve 2 made of plastic material has good flexibility and deformation ability, does not absorb anode current, and has good stability, corrosion resistance and water resistance. The flexible sleeve 2 in this embodiment is a porous high-density polyethylene sleeve, and can also be a porous plastic sleeve made of other corrosion-resistant and water-resistant materials, such as polyvinyl chloride, etc. The diameter of the high-density polyethylene tube can be selected according to the inner diameter of the container and the pipeline, and has sizes such as DN25mm, DN32mm, and DN40mm.

[0030] As a preferred implementation, the flexible substrate 12 is a titanium wire, and the coating 11 is a mixed metal oxide coating 11 .

[0031] The anode body 1 in this embodiment uses titanium wire as a flexible substrate with a mixed metal oxide (MMO) coating coated on the surface. The diameter of the titanium wire is selected according to design requirements, and includes φ1.0mm, φ1.5mm, φ2.0mm, and φ3.0mm. The MMO / Ti flexible anode has the advantages of low consumption rate, light weight, small size, large output current, long life, and flexible installation method.

[0032] As a preferred implementation, the flexible anode in this embodiment further includes an anode fixing device 4 , and the anode fixing device 4 is connected to both ends of the flexible sleeve 2 respectively.

[0033] The anode fixing device 4 is used to fix the flexible sleeve 2 and the anode body 1 therein in the device to be protected from corrosion.

[0034] As a preferred embodiment, the anode fixing device 4 includes a first connecting pipe 41 and a second connecting pipe 44. The first connecting pipe 41 and the second connecting pipe 44 are made of carbon steel or stainless steel. The first connecting pipe 41 is connected to the side wall of the anti-corrosion device, and the first connecting pipe 41 and the second connecting pipe 44 are connected by flange 42 and bolt 43, and the flexible anode is arranged through the first connecting pipe 41 and the second connecting pipe 44. Flange 42 can be an insulating flange. The material of flange 42 can be metal or non-metal. The interior of the first connecting pipe 41 and the second connecting pipe 44 is sealed by potting glue to avoid leakage. The first connecting pipe 41 is fixed to the wall of the container or the pipeline, and the fixing method can be welding, threading, etc. to ensure that the anode fixing device is firmly installed on the container or the pipeline. A radial locking bolt 45 is also provided on the second connecting pipe 44, and the anode body 1 is connected to the locking bolt 45 to limit the flexible anode.

[0035] In addition, the anode fixing device 4 may also adopt an existing fixing device.

[0036] As another embodiment, Figure 2As shown, the flexible anode further includes a first cable 71, which is arranged along the length direction of the anode body 1 through the flexible sleeve 2 and connected to the anode body 1 through a plurality of first connection points 51. The anode body is electrically connected to the cable once at a certain interval, the resistance at the first connection point 51 is not greater than 0.0009Ω, and a waterproof seal is made, and the waterproof seal level must meet the requirements of IPX8 in GB / T4208.

[0037] This situation is suitable for large-volume devices with large cross-sections. The anode body is energized by electrically connecting the anode body to the first cable once at a certain interval to avoid current attenuation of the anode body 1.

[0038] This embodiment also provides an anti-corrosion device, including the above-mentioned flexible anode, the flexible anode is installed in the anti-corrosion device and connected to the anti-corrosion device through the anode fixing device 4.

[0039] The anode fixing device in this embodiment is fixed in a pre-punched hole on the anti-corrosion device, and the fixing method can be selected from welding, threading and other connection methods.

[0040] The anti-corrosion device in this embodiment can achieve comprehensive protection of the inner wall of the device by installing flexible anodes, so that the gas-liquid mixing area and the accessory area are fully protected.

[0041] As a preferred implementation mode, Figure 3 and Figure 4 As shown, the anti-corrosion device is a container or a pipe 6, and the flexible anode is arranged in a ring shape along the inner wall of the container or the pipe 6 and connected to the inner wall of the container or the pipe 6 through a plurality of fixing buckles 8. The plurality of fixing buckles 8 are arranged in a ring shape, and the fixing buckles 8 adopt an existing structure. The fixing buckle 8 is made of non-metallic material, and can be made of plastic. Both ends of the flexible anode are installed on the side wall of the container or the pipe 6 through the anode fixing device 4.

[0042] The flexible anodes in this embodiment are arranged in a ring along the inner wall of the container and the pipe section to prevent the flexible anodes from being washed by the medium and changing their positions. The flexible anodes are fixed along the inner wall with a fixing buckle 8. The number of rings and the spacing between the rings of the flexible anodes can be determined according to the detailed design. The flexible anodes are arranged in a ring to ensure that all positions on the inner wall of the steel container and the pipe can absorb sufficient protection current through the medium in the container, avoiding the possibility of corrosion in the gas phase and liquid phase mixing area and the accessory area due to insufficient protection.

[0043] As a preferred implementation mode, Figure 1 As shown, the anti-corrosion device further comprises a second cable 72, which is respectively connected to the anode body 1 of the flexible anode or two ends of the first cable 71 through the second connection points 52. The second cable 72 is connected to the positive pole of the power supply device.

[0044] When the flexible anode is not provided with the first cable 71, the second cable 72 is directly connected to the two ends of the titanium wire of the anode body 1. This situation is generally suitable for small-volume devices with a small cross-section. The corresponding flexible anode is short in length around the container and the pipeline, has a small resistance, and has a small current attenuation. When the second cable 72 is powered, the second cable 72 supplies power to the anode body 1 to meet the demand for anode current release.

[0045] When the flexible anode is provided with a first cable 71 and is applied in a large-volume device, the second cable 72 is connected to both ends of the first cable 71 to energize the first cable 71. The first cable 71 is electrically connected to the anode body once at a certain interval, and the anode body is energized at multiple points, thereby avoiding current attenuation of the anode body 1.

[0046] The second connection point 52 is located in the second connection tube 44, and the second connection tube 44 is insulated and sealed by potting glue. Specifically, the second connection tube 44 is insulated and sealed by potting epoxy resin glue. The resistance of the connection point between the anode body and the second cable 72 should be small enough, not greater than 0.0009Ω.

[0047] In view of the defects of the prior art, the flexible anode body of this embodiment has a simple structure, with a titanium wire substrate surface coated with a mixed metal oxide (MMO) coating. The anode is light in weight and flexible in layout. The outer side of the anode body is sheathed with a porous high-density polyethylene sleeve that is resistant to corrosion and water environments. The MMO coating on the anode is not easily eroded by the medium for a long time and falls off, which ensures the life of the auxiliary anode and can also fully protect the inner wall of the container and the pipeline, especially avoiding the phenomenon of under-protection of the gas-liquid mixing zone above the medium and the inner wall of the accessories. It can ensure that the inner wall of the steel container and pipeline, especially the gas-liquid mixing zone and the accessory zone, are fully protected.

[0048] The flexible anode of this embodiment solves the problem in the prior art that the mixed metal oxide (MMO) anode of the probe anode is easily eroded by the medium on the inner wall of the container and the pipeline and easily falls off, and also avoids the problem of under-protection and corrosion in the gas and liquid mixed area and the inner wall of the accessories in the inner wall of the container and the pipeline due to the inability to absorb sufficient protection current.

[0049] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make several modifications and improvements without departing from the creative concept of the present invention, which should be included in the protection scope of the present invention.

Claims

1. A flexible anode, characterized in that: include An anode body (1), the anode body (1) comprising a flexible substrate (12) and a coating (11), the flexible substrate (12) being a flexible long strip structure, and the coating (11) being coated on the outer surface of the flexible substrate (12); A flexible sleeve (2), the flexible sleeve (2) being sleeved on the outside of the anode body (1) along the length direction of the anode body (1), a plurality of through holes (3) being provided on the flexible sleeve (2), and anode current being able to be output from the inside of the flexible sleeve (2) to the outside of the flexible sleeve (2) through the through holes (3).

2. A flexible anode according to claim 1, characterized in that: The plurality of through holes (3) are evenly distributed along the length direction of the flexible sleeve (2), and the through holes (3) include a first direction hole (31) and a second direction hole (32), and the first direction hole (31) and the second direction hole (32) are vertically arranged in the circumferential direction of the flexible sleeve (2).

3. A flexible anode according to claim 1, characterized in that: The flexible sleeve (2) is a plastic tube.

4. The flexible anode according to claim 1, characterized in that: The flexible substrate (12) is a titanium wire, and the coating (11) is a mixed metal oxide coating (11).

5. The flexible anode according to claim 1, characterized in that: It also comprises an anode fixing device (4), wherein the anode fixing device (4) is respectively connected to two ends of the flexible sleeve (2).

6. A flexible anode according to claim 5, characterized in that: The anode fixing device (4) comprises a first connecting tube (41) and a second connecting tube (44); the first connecting tube (41) and the second connecting tube (44) are connected via a flange (42); the flexible anode is arranged through the first connecting tube (41) and the second connecting tube (44); a radial locking bolt (45) is arranged on the second connecting tube (44); and the anode body (1) is connected to the locking bolt (45).

7. The flexible anode according to claim 1, characterized in that: It also comprises a first cable (71), wherein the first cable (71) is arranged along the length direction of the anode body (1) through the flexible sleeve (2) and is connected to the anode body (1) through a plurality of first connection points (51).

8. An anti-corrosion device, characterized in that: The flexible anode comprises the flexible anode as described in any one of claims 1 to 7, wherein the flexible anode is installed in the anti-corrosion device and connected to the anti-corrosion device through the anode fixing device (4).

9. The anti-corrosion device according to claim 8, characterized in that: The anti-corrosion device is a container or a pipe (6), and the flexible anode is arranged in a ring shape along the circumference of the inner wall of the container or the pipe (6) and is connected to the inner wall of the container or the pipe (6) via a plurality of fixing buckles (8).

10. The anti-corrosion device according to claim 8, characterized in that: The invention also comprises a second cable (72), wherein the second cable (72) is respectively connected to the anode body (1) of the flexible anode or two ends of the first cable (71) via a second connection point (52), wherein the second connection point (52) is located in a second connection tube (44), and the second connection tube (44) is insulated and sealed by potting glue.

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