A monitoring device for the effect of sacrificial anode cathodic protection of steel structures
By designing a sacrificial anode cathode protection effect monitoring device for steel structures, combining the measurement of the sacrificial anode resistance value and the potential of the steel structure, the problem that the prior art cannot comprehensively evaluate the service status of the sacrificial anode is achieved, and more comprehensive and real-time monitoring is achieved The effect ensures the stability of the device and long-term use.
Patent Information
- Application Number
- CN202110850168.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-07-27
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2041-07-27
AI Technical Summary
The existing monitoring devices cannot comprehensively evaluate the service status of the sacrificial anode, especially in extreme maritime environments, and are mostly limited to single current testing, so the service status of the sacrificial anode cannot be controlled in real time.
A steel structure sacrificial anode cathode protection effect monitoring device including a fixed box, a conductive probe, a reference electrode and a monitoring instrument was designed. By measuring the sacrificial anode resistance value and the steel structure potential, and combining the calculation module to calculate the sacrificial anode consumption quality, the sacrificial anode consumption quality is achieved. Comprehensive monitoring of the residual amount of the anode and the protected potential of the steel structure.
A more comprehensive evaluation of the protection effect of the sacrificial anode is achieved, the preparation process is simple, with good mechanical strength and environmental corrosion resistance, ensuring long-term service life, and monitoring the consumption of the sacrificial anode at any time.
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Figure CN113502478B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of metal material corrosion and protection, and in particular relates to a device for monitoring the effect of sacrificial anode and cathode protection of a steel structure. Background Art
[0002] Steel structure projects play a major role in the construction of my country's transportation infrastructure due to their advantages such as short construction period, low energy consumption and convenient construction. For example, offshore drilling platforms, offshore wind power, high-pile docks and other projects have all used steel structure materials on a large scale. However, affected by the harsh marine service environment, the corrosion of steel structures is serious. The use of sacrificial anodes for cathodic protection of steel structures is currently a common technology. In order to evaluate the effectiveness of sacrificial anodes, it is necessary to regularly test the potential of steel structures and the remaining sacrificial anodes on site. However, on-site testing is greatly affected by environmental conditions, especially in extreme weather conditions for offshore projects. On-site inspections are inconvenient. In order to control the service status of sacrificial anodes in real time, the scientific research community has carried out a large number of research and development of automated monitoring equipment, but existing monitoring devices are mostly limited to single current tests and cannot comprehensively evaluate the service status of sacrificial anodes. Summary of the invention
[0003] The purpose of the present invention is to provide a device for monitoring the cathodic protection effect of sacrificial anodes for steel structures, which can realize comprehensive monitoring of the remaining amount of sacrificial anodes and the protected potential of the steel structure, and can more comprehensively and reasonably evaluate the cathodic protection effect of sacrificial anodes.
[0004] The present invention is achieved through the following technical solutions:
[0005] A device for monitoring the cathodic protection effect of a steel structure sacrificial anode comprises a fixing box and a monitoring instrument. Connectors are installed on the four sides of the fixing box. A conductive probe is provided at one end of the connecting piece away from the fixing box. The conductive probe is connected to a first wire. A reference electrode is provided on the surface of the fixing box. The reference electrode is connected to a second wire. The first wire and the second wire can be connected to the monitoring instrument.
[0006] Furthermore, the connecting piece is a basket screw, which includes a main sleeve and two threaded rods, the two threaded rods are respectively threadedly connected to the two ends of the main sleeve, one end of one threaded rod away from the main sleeve is connected to the conductive probe, and the other end of the threaded rod away from the main sleeve is penetrated and arranged in the fixing box.
[0007] Furthermore, a wire outlet is provided on the fixed box, a protective tube is provided at the wire outlet, the interior of the threaded rod is a hollow structure, the first wire of the conductive probe passes through the two threaded rods of the connecting piece connected thereto in sequence and then is gathered into the fixed box, and passes through the wire outlet and the protective tube to extend to the outside of the fixed box, the second wire passes through the fixed box and then is gathered into the fixed box, and passes through the wire outlet and the protective tube to extend to the outside of the fixed box.
[0008] Furthermore, the conductive probe comprises a half-moon-shaped fixing plate, the outer side of the fixing plate is connected to the connecting piece, the inner side of the fixing plate is provided with a contact copper sheet, and the first conductive wire is connected to the contact copper sheet.
[0009] Furthermore, the fixing box, the connecting piece and the fixing plate are all made of polytetrafluoroethylene material.
[0010] Furthermore, it also includes a calculation module connected to the monitoring instrument, and the calculation module calculates the sacrificial anode consumption mass in the following manner according to the measured sacrificial anode resistance value information:
[0011] S1. The sacrificial anode cross-sectional area loss rate is obtained from the monitoring resistance value of the monitoring instrument:
[0012]
[0013] Where ρ1 is the resistivity of the sacrificial anode material, L is the length of the sacrificial anode, R0 is the initial resistance of the sacrificial anode, and R i The resistance value of the sacrificial anode monitored by the monitoring instrument;
[0014] S2. Calculate the sacrificial anode consumption mass based on the sacrificial anode cross-sectional area loss rate:
[0015] Δm=ρ2×L×ΔS;
[0016] Where ρ2 is the sacrificial anode density.
[0017] Furthermore, the reference electrode is an Ag / AgCl electrode, and the reference electrode is a solid electrode.
[0018] Compared with the prior art, the beneficial effects of the present invention are: simple preparation process, convenient on-site construction, good mechanical strength and environmental corrosion resistance, effectively ensuring long-term service life, and evaluating consumption by measuring changes in sacrificial anode resistance value, which can be monitored at any time, and combined with measuring the steel structure potential and the sacrificial anode potential, the cathodic protection effect of the sacrificial anode can be more comprehensively evaluated. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a structural schematic diagram of a device for monitoring the effect of sacrificial anode cathodic protection of a steel structure according to the present invention;
[0020] Figure 2 It is a schematic diagram of the installation of the sacrificial anode cathodic protection effect monitoring device for steel structures of the present invention;
[0021] Figure 3 It is an enlarged schematic diagram of the conductive probe in the device for monitoring the sacrificial anode cathodic protection effect of steel structures of the present invention.
[0022] In the figure, 1-fixed box, 2-connecting piece, 21-body sleeve, 22-threaded rod, 3-conductive probe, 31-fixed plate, 32-contact copper sheet, 4-first wire, 5-reference electrode, 6-second wire, 7-monitoring instrument, 8-sacrificial anode, 9-steel structure. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.
[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0025] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0027] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0028] See also Figure 1 , Figure 1 The schematic diagram of the structure of the monitoring device for sacrificial anode cathodic protection effect of steel structure of the present invention is a monitoring device for sacrificial anode cathodic protection effect of steel structure, comprising a fixing box 1 and a monitoring instrument 7, the fixing box 1 is provided with connectors 2 on four sides, the connector 2 is provided with a conductive probe 3 at one end away from the fixing box 1, the conductive probe 3 is connected to a first wire 4, a reference electrode 5 is provided on the surface of the fixing box 1, the reference electrode 5 is connected to a second wire 6, and the first wire 4 and the second wire 6 can be connected to the monitoring instrument 7.
[0029] Please refer to Figures 2 to 3 , Figure 2 This is a schematic diagram of the installation of the steel structure sacrificial anode cathodic protection effect monitoring device of the present invention. Figure 3 The diagram is an enlarged schematic diagram of the conductive probe in the cathodic protection effect monitoring device for sacrificial anodes of steel structures of the present invention. The upper and lower ends of the sacrificial anode 8 are fixed ends, and the two fixed ends are respectively fixed on the steel structure 9. The cathodic protection effect monitoring device for sacrificial anodes 8 of steel structures of the present invention is arranged between the sacrificial anode 8 and the steel structure 9. Connectors 2 are installed on the upper side, lower side, left side and right side of the fixing box 1. The conductive probes 3 on the four connectors 2 are respectively in close contact with the two fixed ends of the sacrificial anode 8, the middle part of the sacrificial anode 8 and the steel structure 9. The cathodic protection effect monitoring device for sacrificial anodes 8 of steel structures of the present invention is fixed between the sacrificial anode 8 and the steel structure 9. Figure 2As shown. In one embodiment, the connector 2 is a turnbuckle screw, which includes a body sleeve 21 and two threaded rods 22. The two threaded rods 22 are respectively threadedly connected to the two ends of the body sleeve 21. One end of the threaded rod 22 away from the body sleeve 21 is connected to the conductive probe 3, and the other end of the threaded rod 22 away from the body sleeve 21 is arranged in the fixing box 1. The connector 2 adopts a turnbuckle screw, and the overall length of each connector 2 is adjusted by the extension length of the threaded rod 22 from the body sleeve 21, so as to ensure that the conductive probes 3 on the four connecting rods are in close contact with the two fixed ends of the sacrificial anode 8, the middle part of the sacrificial anode 8 and the steel structure 9. In one embodiment, the conductive probe 3 includes a half-moon-shaped fixing plate 31, the outer side of which is connected to the connector 2, and the inner side thereof is provided with a contact copper sheet 32, and the first wire 4 is connected to the corresponding contact copper sheet 32. The fixing plate 31 is in a half-moon shape, and the contact copper sheet 32 is fixed on the inner side of the fixing plate 31. The contact copper sheet 32 is also in a half-moon shape. This arrangement allows the fixing plate 31 and the contact copper sheet 32 to fit more closely to the two fixed ends of the sacrificial anode 8, the middle of the sacrificial anode 8 or the steel structure 9, so that the cathodic protection effect monitoring device of the sacrificial anode 8 of the steel structure 9 of the present invention can be more firmly fixed between the sacrificial anode 8 and the steel structure 9. In one embodiment, the fixing box 1, the connector 2 and the fixing plate 31 are all made of polytetrafluoroethylene material. This arrangement allows the cathodic protection effect monitoring device of the sacrificial anode 8 of the steel structure 9 of the present invention to have good mechanical strength and environmental corrosion resistance as a whole, effectively ensuring the long service life of the monitoring device.
[0030] The reference electrode 5 is fixed on the surface of the fixed box 1. In one embodiment, the reference electrode 5 is preferably an Ag / AgCl electrode, and the reference electrode 5 is preferably a solid electrode. When measurement is required, the corresponding first wire 4 or second wire 6 is selected according to the required measurement data to connect to the monitoring instrument 7. Specifically, the monitoring instrument 7 measures the resistance value of the sacrificial anode 8 by connecting the first wire 4 of the conductive probe 3 in contact with the two fixed ends of the sacrificial anode 8, and the monitoring instrument 7 measures the potential of the steel structure 9 by connecting the second wire 6 and the first wire 4 of the conductive probe 3 in contact with the steel structure 9, or the monitoring instrument 7 measures the potential of the sacrificial anode 8 by connecting the second wire 6 and the first wire 4 of the conductive probe 3 in contact with the middle of the sacrificial anode 8. The monitoring instrument 7 can be a multimeter or an electrochemical workstation. In one embodiment, a wire outlet is provided on the fixed box 1, and a protective tube (not shown) is provided at the wire outlet. The threaded rod 22 is hollow inside. The first wire 4 of the conductive probe 3 passes through the two threaded rods 22 of the connector 2 connected thereto in sequence and is collected in the fixed box 1, and passes through the wire outlet and the protective tube to extend to the outside of the fixed box 1. The second wire 6 passes through the fixed box 1 and is collected in the fixed box 1, and passes through the wire outlet and the protective tube to extend to the outside of the fixed box 1. The first wires 4 of the four wire probes and the second wire 6 of the reference electrode 5 are collected in the fixed box 1 and collected together through the protective tube. The fixed box 1 and the protective tube can collect, store and protect the first wire 4 and the second wire 6, avoid the wires from being scattered, and facilitate carrying.
[0031] In one embodiment, in order to obtain the consumed mass of the sacrificial anode 8, the cathodic protection effect monitoring device of the sacrificial anode 8 of the steel structure 9 of the present invention further includes a calculation module connected to the monitoring instrument 7. The calculation module calculates the consumed mass of the sacrificial anode 8 in the following manner according to the measured resistance value information of the sacrificial anode 8:
[0032] S1. The cross-sectional area loss rate of the sacrificial anode 8 is obtained from the monitoring resistance value of the monitoring instrument 7:
[0033]
[0034] Wherein, ρ1 is the resistivity of the sacrificial anode 8 material, unit, L is the length of the sacrificial anode 8, R0 is the initial resistance value of the sacrificial anode 8, R i The resistance value of the sacrificial anode 8 monitored by the monitoring instrument 7;
[0035] S2. Calculate the consumed mass of the sacrificial anode 8 according to the loss rate of the cross-sectional area of the sacrificial anode 8:
[0036] Δm=ρ2×L×ΔS;
[0037] Wherein, ρ2 is the density of sacrificial anode 8.
[0038] The following briefly describes the monitoring process of the device for monitoring the cathodic protection effect of the sacrificial anode 8 of the steel structure 9 of the present invention:
[0039] The first wire 4 of the conductive probe 3 in contact with the two fixed ends of the sacrificial anode 8 is connected to the monitoring instrument 7, and the resistance value of the sacrificial anode 8 is measured by the monitoring instrument 7, and then the formula The mass consumed by the sacrificial anode 8 is calculated by the formula Δm=ρ2×L×ΔS, and then the second wire 6 and the first wire 4 of the conductive probe 3 in contact with the steel structure 9 are connected to the monitoring instrument 7, the potential of the steel structure 9 is measured by the monitoring instrument 7, and the effectiveness of the cathodic protection of the steel structure 9 by the sacrificial anode 8 is evaluated according to the potential of the steel structure 9. Specifically, when the potential of the steel structure 9 is greater than 800mv, it means that the cathodic protection of the steel structure 9 by the sacrificial anode 8 is effective; and then the second wire 6 and the first wire 4 of the conductive probe 3 in contact with the middle of the sacrificial anode 8 are connected to the monitoring instrument 7, the potential of the sacrificial anode 8 is measured by the monitoring instrument 7, and whether the sacrificial anode 8 itself still has the ability to protect the steel structure 9 is evaluated according to the potential of the sacrificial anode 8. Specifically, when the potential of the sacrificial anode 8 is less than 1200mv, it means that the sacrificial anode 8 still has the ability to protect the steel structure 9.
[0040] Compared with the prior art, the beneficial effects of the present invention are: simple preparation process, convenient on-site construction, good mechanical strength and environmental corrosion resistance, effectively ensuring long-term service life, and measuring the change in the resistance value of the sacrificial anode 8 to evaluate the consumption, which can be monitored at any time, and combined with measuring the potential of the steel structure 9 and the potential of the sacrificial anode 8, the cathodic protection effect of the sacrificial anode 8 can be more comprehensively evaluated.
[0041] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A monitoring device for the effect of sacrificial anode cathodic protection of steel structure, characterized in that: The invention comprises a fixing box, a monitoring instrument and a computing module connected to the monitoring instrument, wherein the fixing box is provided with a connecting piece on each of the four sides thereof, a conductive probe is provided at one end of the connecting piece away from the fixing box, the conductive probe is connected to a first wire, a reference electrode is provided on the surface of the fixing box, the reference electrode is connected to a second wire, the first wire and the second wire can be connected to the monitoring instrument, the connecting piece is a turnbuckle screw, which comprises a body sleeve and two threaded rods, the two threaded rods are respectively threadedly connected to the two ends of the body sleeve, one end of the threaded rod away from the body sleeve is connected to the conductive probe, and the other end of the threaded rod away from the body sleeve is penetrated and arranged in the fixing box, a wire outlet is provided on the fixing box, a protective tube is provided at the wire outlet, the threaded rod is hollow in structure, the first wire of the conductive probe passes through the two threaded rods of the connecting piece connected thereto in sequence and then is collected in the fixing box, and passes through the wire outlet and the protective tube to extend to the outside of the fixing box, the second wire passes through the fixing box and then is collected in the fixing box, and passes through the wire outlet and the protective tube to extend to the outside of the fixing box; The calculation module calculates the sacrificial anode consumption mass in the following manner according to the measured sacrificial anode resistance value information: S1. The sacrificial anode cross-sectional area loss rate is obtained from the monitoring resistance value of the monitoring instrument: Where ρ1 is the resistivity of the sacrificial anode material, L is the length of the sacrificial anode, R0 is the initial resistance of the sacrificial anode, and R i The resistance value of the sacrificial anode monitored by the monitoring instrument; S2. Calculate the sacrificial anode consumption mass based on the sacrificial anode cross-sectional area loss rate: Δm=ρ2×L×ΔS; Where ρ2 is the sacrificial anode density.
2. The device for monitoring the effect of sacrificial anode cathodic protection of steel structure according to claim 1, characterized in that: The conductive probe comprises a half-moon-shaped fixing plate, the outer side of the fixing plate is connected to the connecting piece, the inner side of the fixing plate is provided with a contact copper sheet, and the first conductive wire is connected to the contact copper sheet.
3. The device for monitoring the effect of sacrificial anode cathodic protection of steel structure according to claim 2, characterized in that: The fixing box, the connecting piece and the fixing plate are all made of polytetrafluoroethylene material.
4. The device for monitoring the effect of sacrificial anode cathodic protection of steel structure according to claim 1, characterized in that: The reference electrode is an Ag / AgCl electrode, and the reference electrode is a solid electrode.