System for testing corrosion rate of buried pipeline
By designing a buried pipeline corrosion rate testing system with copper-core wire and sealing insulation layer, the problem that traditional methods are difficult to evaluate the corrosion performance of large-volume metal materials is solved, and the accurate measurement of the corrosion rate of buried pipelines is achieved under the interference of stray currents.
Patent Information
- Application Number
- CN202422385717.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-29
AI Technical Summary
In the prior art, it is difficult to evaluate the corrosion resistance performance of metal materials with large volumes or inconvenient displacement in the prior art, especially under stray current interference, and it is difficult to effectively evaluate the corrosion rate by traditional corrosion weight loss methods.
A buried pipeline corrosion rate test system was designed, including square sheet-shaped test pieces. The test pieces were divided into experimental areas and non-experimental areas. The experimental areas were coated with water-based tape, and the non-experimental areas were equipped with cylindrical through holes and copper core wires. The outside was coated with a sealed insulating layer to ensure that the test pieces were insulated from the outside, and electrically connected to the pipeline through the copper core wires, and fixed by a flexible rubber shell and magnetic suction layer.
The system can accurately test the corrosion rate of the pipeline under acceptable erosion and tangential forces, avoid external factors, and provide more reliable corrosion rate data, solving the evaluation problems of traditional methods.
Smart Images
Figure CN223217342U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of buried pipeline corrosion testing, in particular to a buried pipeline corrosion rate testing system under stray current interference. Background Art
[0002] With the rapid development of infrastructure construction such as high-speed railways, high-voltage AC and DC transmission lines, urban rail transit and oil and gas pipelines in our country, leakage currents from rail transit and other systems cause stray current interference corrosion to buried oil and gas pipelines.
[0003] Current research and case studies have demonstrated the causes, patterns, and hazards of stray current generation in buried pipelines, but consensus on specific evaluation methods remains lacking. The corrosion weight loss method is widely used as a traditional method for characterizing metal corrosion rates. This method, based on the weight change of a metal during corrosion, provides a direct reflection of the material's corrosion resistance.
[0004] However, the current corrosion weight loss method has the following technical problems: since the metal material needs to be weighed during the corrosion process to obtain its weight change, once the metal material is large or inconvenient to move, weighing is difficult to achieve, making it difficult to evaluate the corrosion resistance of the material.
[0005] Therefore, the present application combines the characteristics of buried pipeline stray current interference and optimizes the traditional corrosion weight loss method to become a corrosion rate testing system suitable for specific environments, thereby providing a buried pipeline corrosion rate testing system. Summary of the Invention
[0006] The main purpose of the utility model is to overcome the deficiencies in the prior art and provide a buried pipeline corrosion rate testing system.
[0007] The technical solution adopted by the utility model to achieve its technical purpose is: a buried pipeline corrosion rate testing system, including a square sheet test piece, the square sheet test piece is divided into an experimental area and a non-experimental area;
[0008] Apply a layer of water-based tape to the test area of the square sheet test piece, and tear off the water-based tape to form an exposed surface of the square sheet test piece;
[0009] A cylindrical through hole is formed at one end of the non-experimental area of the square sheet test piece, a polytetrafluoroethylene screw is fixedly disposed in the cylindrical through hole, one end of the polytetrafluoroethylene screw is fixedly connected to a copper core wire with an O-type terminal, so that one end of the copper core wire maintains good wire contact with the square sheet test piece through the O-type terminal, and the other end of the copper core wire is electrically connected to the pipeline;
[0010] The outside of the non-experimental area of the square sheet test piece is coated with a sealed insulating inner layer and a sealed insulating outer layer, so that the non-experimental area is isolated from the outside world.
[0011] Preferably, the diameter parameter of the copper core wire is 2.5 mm, the outer sheath is made of insulating material PE, one end of the copper core wire is fixedly connected to the polytetrafluoroethylene screw through an O-type terminal, and the resistance of the other end is less than 0.5Ω.
[0012] Preferably, the O-type terminal is fixedly connected to the copper core wire and then reinforced with solder, and the connection between the O-type terminal and the polytetrafluoroethylene screw is also reinforced with solder;
[0013] The solder-reinforced area forms a wire connection area.
[0014] Preferably, the sealing insulating inner layer is paraffin or silane glue, and the sealing insulating outer layer is a flexible plastic shell; the inner layer of paraffin or silane glue is filled so that the flexible plastic shell and the non-experimental area of the square sheet test piece are completely insulated and sealed, and the outer layer of the flexible plastic shell serves as a reinforcement.
[0015] Preferably, the other end of the copper core wire is connected to the pipe through a fixing assembly, and the fixing assembly includes a soft strip, a connecting conductive sheet, a magnetic layer, an adhesive layer, and a transparent sealing layer bag;
[0016] One side of the transparent sealing layer bag is coated with an adhesive layer, and the transparent sealing layer bag is fixed to one side of the soft strip through the adhesive layer;
[0017] The other side of the flexible strip is coated with a magnetic layer, and the connecting conductive sheet is embedded inside the magnetic layer and the flexible strip;
[0018] The other end of the copper core wire passes through the soft strip and is electrically connected to the connecting conductive sheet. When the other side of the soft strip is attached to the pipe, the connecting conductive sheet maintains electrical contact with the pipe. The magnetic attraction layer maintains magnetic attraction with the pipe, so that the soft strip is attached to the pipe, and the connecting conductive sheet maintains electrical contact with the pipe. At the same time, the transparent sealing layer bag is bonded to the pipe with the adhesive layer to further fix the position of the soft strip.
[0019] The working principle and specific use process of the buried pipeline corrosion rate test system:
[0020] a. The same material as the pipe to be tested is metal, machined into a size of 100mm×50mm×4mm, with a surface roughness less than st3. At the same time, an M4 cylindrical through hole is opened at 1 / 5 of the long plane of the test piece. The surface stains are removed, and the mass of the test piece is weighed after drying to an accuracy of 0.0001g;
[0021] b. Use an M4 PTFE screw to connect the copper core wire with the O-type terminal to the test piece and ensure good contact. If necessary, reinforce the copper core wire and the O-type terminal with solder.
[0022] c. Mark an area of ∅28.6mm or ∅11.2mm in the center of the XY plane of the test piece as the experimental area, apply water-based tape, and immerse the remaining area in molten paraffin wax or silane glue, ensuring that the immersed part is fully wrapped by the paraffin wax or silane glue. After the paraffin wax or silane glue solidifies, install the pre-prepared flexible plastic shell on the surface of the test piece soaked with paraffin wax or silicone glue;
[0023] d. Apply silicone or molten paraffin to the gap between the flexible plastic shell and the exposed edge of the test piece, and use 1kV electric spark to test the effect of the coating insulation layer;
[0024] e. When in use, electrically connect the test piece to the pipeline and bury it in the same soil environment as the pipeline. After the test cycle is completed, clean the packaging materials and corrosion products on the surface of the sample, obtain the mass of the test piece after the experiment, and calculate the corrosion rate per unit area of the pipeline based on the above data.
[0025] Compared with the prior art, the beneficial effects of the present invention are:
[0026] This buried pipeline corrosion rate testing system can adjust the exposed area of the test piece according to experimental requirements. The weightless test piece prepared using this sealing system is used to test the corrosion of the pipeline itself or the corrosion rate caused by stray current under acceptable scouring and tangential forces. Compared with other electrochemical instruments, the data collected is more convincing, thus solving the existing problem of difficulty in weighing and evaluating the corrosion resistance of metal materials due to their large size or inconvenient displacement.
[0027] The buried pipeline corrosion rate test system uses sealing insulation materials that do not react with the test piece substrate, eliminating the influence of external factors on the experimental results; the area where the test piece contacts the copper core conductor is completely sealed, eliminating galvanic corrosion of the test piece in the soil; the filling material adheres well to the substrate, preventing liquid from entering the gap between the substrate and the reinforcement layer to cause crevice corrosion; after the experiment, the sealing material is easy to completely remove, and the experimental results will not be affected by incomplete removal of the sealing material or damage to the test piece during the removal process. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 This is a schematic diagram of the main structure of the buried pipeline corrosion rate testing system.
[0029] Figure 2 This is a side view cross-sectional structural diagram of the buried pipeline corrosion rate testing system.
[0030] Figure 3Schematic diagram of the main structure of the buried pipeline corrosion rate test system after installing the fixed components.
[0031] in:
[0032] 1-Square sheet test piece; 101-Water-based tape; 102-Experimental area; 103-Non-experimental area; 2-Cylindrical through-hole; 3-PTFE screw; 4-O-type terminal; 5-Copper core wire; 6-Wire connection area; 7-Sealed insulation inner layer; 8-Sealed insulation outer layer; 9-Flexible strip; 901-Connecting conductive sheet; 902-Magnetic layer; 903-Adhesive layer; 10-Transparent sealing layer bag. DETAILED DESCRIPTION
[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0034] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0035] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. However, it should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the present invention. Furthermore, descriptions of known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention. Example 1:
[0036] See also Figure 1-2 A buried pipeline corrosion rate testing system includes a square sheet test piece 1, which is divided into an experimental area 102 and a non-experimental area 103.
[0037] A layer of water-based tape 101 is applied to the experimental area 102 of the square sheet test piece 1 , and the water-based tape 101 is torn off to form an exposed surface of the square sheet test piece 1 .
[0038] The non-experimental area 103 of the square sheet test piece 1 is coated with a sealed insulating inner layer 7 and a sealed insulating outer layer 8 to achieve insulation of the non-experimental area 103 from the outside world; the sealed insulating inner layer 7 is paraffin or silane glue, and the sealed insulating outer layer 8 is a flexible plastic shell; the inner layer of paraffin or silane glue is filled to make the flexible plastic shell completely insulated and sealed from the non-experimental area of the square sheet test piece 1, and the outer layer of flexible plastic shell serves as a reinforcement.
[0039] A cylindrical through hole 2 is opened at one end of the non-experimental area 103 of the square sheet test piece 1, and a polytetrafluoroethylene screw 3 is fixedly installed in the cylindrical through hole 2. One end of the polytetrafluoroethylene screw 3 is fixedly connected to a copper core wire 5 with an O-type terminal 4. Through the O-type terminal 4, one end of the copper core wire 5 maintains good wire contact with the square sheet test piece 1, and the other end of the copper core wire 5 is electrically connected to the pipeline.
[0040] The copper conductor 5 has a diameter of 2.5 mm² and is sheathed in PE. One end of the copper conductor 5 is fixedly connected to the polytetrafluoroethylene screw 3 via an O-type terminal 4, and the resistance at the other end is less than 0.5 Ω. The O-type terminal 4 is then reinforced with solder, and the connection between the O-type terminal 4 and the polytetrafluoroethylene screw 3 is also reinforced with solder; the solder-reinforced area forms the conductor connection region 6.
[0041] Implementation:2:
[0042] See also Figure 1-3 On the basis of the above embodiment, in the buried pipeline corrosion rate testing system, the other end of the copper core wire 5 is connected to the pipeline through a fixing assembly, which includes a soft strip 9, a connecting conductive sheet 901, a magnetic layer 902, an adhesive layer 903, and a transparent sealing layer bag 10;
[0043] One side of the transparent sealing layer bag 10 is coated with an adhesive layer 903, which secures the transparent sealing layer bag 10 to one side of the flexible strip 9. The other side of the flexible strip 9 is coated with a magnetic layer 902, and a connecting conductive sheet 901 is embedded within the magnetic layer 902 and the flexible strip 9. The other end of the copper core wire 5 passes through the flexible strip 9 and is electrically connected to the connecting conductive sheet 901. When the other side of the flexible strip 9 is attached to the pipe, the connecting conductive sheet 901 maintains electrical contact with the pipe.
[0044] The magnetic layer 902 maintains magnetic attraction with the pipe, so that the soft strip 9 is attached to the pipe, and the connecting conductive sheet 901 maintains electrical contact with the pipe. At the same time, the transparent sealing layer bag 10 cooperates with the adhesive layer 903 to adhere to the pipe, further fixing the position of the soft strip 9.
[0045] Specifically, during use, when the square sheet test piece 1 needs to be electrically connected to the pipeline, the soft strip 9 is attached to the pipeline, and the magnetic attraction layer 902 is used to maintain magnetic attraction with the pipeline, so that the connecting conductive sheet 901 maintains electrical contact with the pipeline, and the pipeline is connected to the square sheet test piece 1 through the connecting conductive sheet 901, the copper core wire 5 and the polytetrafluoroethylene screw 3; at the same time, the transparent sealing layer bag 10 is bonded to the pipeline to further fix the position of the soft strip 9.
[0046] The solution in this embodiment can be selectively combined with the solutions in other embodiments for use.
[0047] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present utility model. Therefore, based on the innovative concept of the present utility model, changes and modifications to the embodiments described herein, or equivalent structures, equivalent processes, or equivalent functional transformations made using the contents of the present utility model specification and drawings, and direct or indirect application of the above technical solutions to other related technical fields, are all included in the scope of protection of the present utility model patent.
Claims
1. A buried pipeline corrosion rate testing system, characterized by: The invention comprises a square sheet test piece (1), wherein the square sheet test piece (1) is divided into an experimental area (102) and a non-experimental area (103); A layer of water-based tape (101) is applied to the experimental area (102) of the square sheet test piece (1); A cylindrical through hole (2) is provided at one end of the non-experimental region (103) of the square sheet test piece (1), a polytetrafluoroethylene screw (3) is fixedly provided in the cylindrical through hole (2), and one end of the polytetrafluoroethylene screw (3) is fixedly connected to a copper core wire (5) with an O-type terminal (4); The non-experimental area (103) of the square sheet test piece (1) is coated externally with a sealed insulating inner layer (7) and a sealed insulating outer layer (8).
2. A buried pipeline corrosion rate testing system according to claim 1, characterized in that: The diameter parameter of the copper core wire (5) is 2.5 mm2, and the outer sheath is made of insulating material PE. One end of the copper core wire (5) is fixedly connected to the polytetrafluoroethylene screw (3) through an O-type terminal (4), and the resistance of the other end is less than 0.5Ω.
3. A buried pipeline corrosion rate testing system according to claim 2, characterized in that: The O-shaped terminal (4) and the copper core wire (5) are fixedly connected and then reinforced with solder. The connection between the O-shaped terminal (4) and the polytetrafluoroethylene screw (3) is also reinforced with solder. The solder reinforced area forms a wire connection area (6).
4. A buried pipeline corrosion rate testing system according to claim 1, characterized in that: The sealing insulating inner layer (7) is paraffin or silane glue, and the sealing insulating outer layer (8) is a flexible glue shell.
5. The buried pipeline corrosion rate testing system according to claim 1, characterized in that: The other end of the copper core wire (5) is connected to the pipeline through a fixing assembly, and the fixing assembly includes a soft strip (9), a connecting conductive sheet (901), a magnetic absorption layer (902), an adhesive layer (903), and a transparent sealing layer bag (10); One side of the transparent sealing layer bag (10) is coated with an adhesive layer (903), and the transparent sealing layer bag (10) is fixed to one side of the soft strip (9) through the adhesive layer (903); The other side of the soft strip (9) is coated with a magnetic attraction layer (902), and the connecting conductive sheet (901) is embedded inside the magnetic attraction layer (902) and the soft strip (9); The other end of the copper core wire (5) passes through the soft strip (9) and is electrically connected to the connecting conductive sheet (901); when the other side of the soft strip (9) is attached to the pipeline, the connecting conductive sheet (901) maintains electrical contact with the pipeline.