A method for thermal spraying of aluminum anticorrosion on the grounding flat iron of power equipment and a construction method thereof

Abstract

The application discloses a kind of power equipment ground flat iron ground section hot spray aluminum anticorrosion method, including the following steps, the power equipment needing replacement is segmented and set;The position needing treatment is corrected and handled;The details of the flat iron to be hot sprayed aluminum are handled and the flat iron is packaged and handled to be anticorrosion;The application can prepare long-acting anticorrosion layer, can also effectively control spraying rate and spraying distance, guarantee the uniformity, integrity and quality of aluminum spraying layer;The application further discloses a kind of power equipment ground flat iron ground construction method, can replace corrosion fracture ground section, can effectively isolate the severe environment prone to corrosion, can be effectively protected for a long time.

Description

Technical Field

[0001] This invention relates to the technical field of thermal spraying aluminum corrosion protection methods, and more particularly to a thermal spraying aluminum corrosion protection method for the grounding flat iron entry section of power equipment. Background Technology

[0002] In power grid operation, to ensure the safe and stable operation of power equipment, all equipment casings are required to be grounded. Currently, grounding of equipment casings is achieved by introducing grounding flat irons into the grounding grid. However, grounding flat irons are often most severely corroded at the air-soil interface, causing them to break and resulting in grounding failure of the equipment casing. (See...) Figure One The main reason for this phenomenon is that moisture often adheres to the air-soil interface, and the metal is in a humid environment for a long time. If the soil or atmosphere of the substation contains corrosive media, it will increase the corrosion rate, leading to accelerated corrosion and cracking in that area.

[0003] Metal corrosion (including chemical corrosion and electrochemical corrosion) refers to the damage to metal surfaces caused by chemical and electrochemical interactions with the surrounding medium. Electrochemical corrosion is the corrosion caused by the formation of micro-cells and electrochemical reactions when a metal surface comes into contact with a medium (such as humid air or electrolyte solutions). It is estimated that approximately 20% to 30% of the world's annual metal production is scrapped due to corrosion. Among these corrosion processes, electrochemical corrosion is the most severe.

[0004] Current methods use paint or galvanizing to protect flat iron, but these methods have drawbacks. Paint has poor low-temperature curing properties. Epoxy paint generally requires a curing temperature above 10℃; otherwise, curing is slow. It is generally not advisable to apply paint below 10℃, which poses difficulties for applying it to large outdoor objects in winter. It also has poor photo-aging properties. The aromatic ether bonds in cured epoxy paint degrade and break under ultraviolet radiation, resulting in poor outdoor weather resistance. Long-term exposure to ultraviolet light can lead to substrate aging and damage to the coating's integrity; once localized damage occurs, corrosion can spread rapidly. Galvanizing for corrosion protection is divided into hot-dip galvanizing and cold galvanizing. Hot-dip galvanizing is highly polluting, producing zinc waste and zinc vapors, which seriously harms the health of operators and significantly threatens air quality in cities and rural areas. It is a high-pollution, high-energy-consuming industrial process. Cold-galvanized steel has an electroplated zinc layer, which is independently layered from the steel substrate. The zinc layer is thin and simply adheres to the steel substrate, resulting in poor adhesion and easy detachment, thus its corrosion resistance is poor. Zinc is highly reactive and corrodes quickly, making it unreliable for long-term corrosion protection. In particular, in highly corrosive environments, it can accelerate corrosion in extreme cases. Once the zinc is depleted, the flat iron body loses its protection and will also corrode rapidly. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the above-mentioned method of thermal spraying aluminum for corrosion protection of grounding flat iron in the grounding section of power equipment, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a method for thermal spraying aluminum for corrosion protection of the grounding flat iron entry section of power equipment.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for thermal spraying aluminum for corrosion protection of the grounding flat iron entry section of power equipment, comprising, The power equipment that needs to be replaced should be divided into sections; Correct the locations that need to be processed; Perform detailed processing on the flat iron to be thermally sprayed with aluminum; The flat iron is treated with anti-corrosion packaging.

[0009] As a preferred embodiment of the thermal spraying aluminum anti-corrosion method for the grounding flat iron entry section of power equipment described in this invention, the segmented processing of the power equipment to be replaced involves dividing the flat iron to be replaced into segments, including an air section, a grounding section, and a buried section. The air section is the part exposed to the air and welded to the original power equipment casing. The underground section refers to the thermally sprayed aluminum section, which is the part that is half above the soil interface and half buried in the soil after installation. The buried section refers to the part that is buried underground and welded to the buried ground mesh.

[0010] As a preferred embodiment of the hot-spray aluminum anti-corrosion method for the grounding flat iron entry section of power equipment described in this invention, the correction treatment of the position to be treated is to perform rolling treatment on the flat steel entry section before hot-spraying aluminum. The rolling process involves correcting the surface of the steel in a cold state, so that the steel surface has no obvious concavities or damage.

[0011] As a preferred embodiment of the thermal spraying aluminum corrosion protection method for the grounding flat iron entry section of power equipment according to the present invention, the detailed processing of the flat iron requiring thermal spraying aluminum includes surface cleaning and surface protection treatment. The surface cleaning refers to grinding the buried section of the flat iron to be thermally sprayed with aluminum; the air section and the underground section do not require cleaning. The surface protection treatment involves using thermal spraying aluminum technology to prevent corrosion of the flat iron. As a preferred embodiment of the thermal spraying aluminum anti-corrosion method for the grounding flat iron entry section of power equipment described in this invention, wherein: the thermal spraying aluminum technology is a metal surface protection technology, and the technical effect is reflected by the amount of coating used.

[0012] In a preferred embodiment of the thermal spraying aluminum anti-corrosion method for the grounding flat iron entry section of power equipment described in this invention, the amount of coating used includes both the theoretical amount and the actual amount used. The theoretical coating usage refers to the amount of coating theoretically used according to national regulations. The actual amount of paint used refers to the amount of paint used in the actual process.

[0013] As a preferred embodiment of the thermal spraying aluminum anti-corrosion method for the grounding flat iron entry section of power equipment according to the present invention, the formula for calculating the theoretical amount of coating used is as follows: in, This represents the theoretical usage of the coating, expressed in kg. This indicates the thickness of the aluminum spray, measured in micrometers (µm). This indicates the density of the aluminum sprayed, in units of... S represents the theoretical area to be sprayed, n represents the number of coats to be sprayed, and m is the percentage content of solids in the paint, specifically expressed in two decimal places.

[0014] As a preferred embodiment of the thermal spraying aluminum anti-corrosion method for the grounding flat iron entry section of power equipment described in this invention, the formula for calculating the actual amount of coating used is as follows: in, This refers to the actual amount of paint used. This represents the theoretical usage of the coating, expressed in kg. This indicates the thickness of the aluminum spray, measured in micrometers (µm). This indicates the density of the aluminum sprayed, in units of... S represents the theoretical area to be sprayed, n represents the number of coats to be sprayed, and m is the percentage content of solids in the paint, expressed to two decimal places. This is a loss factor, which is significantly affected by the environment, as detailed below: When the actual operating ambient temperature differs significantly from the theoretical operating ambient temperature, the loss factor is generally set to 0.8. When the actual operating environment humidity differs significantly from the theoretical operating environment humidity, the loss factor is generally taken as 0.7. Failure to follow specifications during actual operation can result in paint loss; the loss factor is typically set at 0.6. As a preferred embodiment of the thermal spraying aluminum anti-corrosion method for the grounding flat iron entry section of the power equipment described in this invention, the anti-corrosion packaging treatment of the flat iron refers to the anti-corrosion packaging treatment of the air section and the buried section; the packaging treatment includes labeling, packaging, transportation and storage.

[0015] As a preferred embodiment of the thermal spraying aluminum anti-corrosion method for the grounding flat iron entry section of power equipment according to the present invention, the method comprises: a field construction method for thermal spraying aluminum anti-corrosion of the grounding flat iron entry section of power equipment, characterized in that it includes, Excavate soil at the location of the existing grounding flat iron, ensuring that the depth and width of the excavation do not affect the welding operation of the grounding section and the original connecting grounding grid flat iron. The cut-off dimensions and location of the original grounding flat iron after excavation are determined based on the thermally sprayed aluminum flat iron. Rust removal and reshaping of the original grounding flat iron air end and grounding grid end; Before welding the flat iron, straighten, level and align the flat iron, cut off the excess length of the hot-sprayed aluminum flat iron embedded section and make the welding bevel. The assembly spot welding is the bevel assembly spot welding of the original grounding flat iron air section and the thermal spray aluminum air section, as well as the bevel assembly spot welding of the original grounding flat iron grounding grid and the thermal spray aluminum flat iron buried section. Select appropriate welding parameters and perform welding using manual arc welding. The weld should be inspected with the naked eye or under a magnifying glass of no more than 10x. Welding defects such as shrinkage cavities, porosity, foreign non-metallic materials, and white spots are not allowed. Backfilling of electrical equipment with soil is required, and the backfilling must ensure that the soil interface is in the ground section and that there is crushed stone backfill.

[0016] The beneficial effects of this invention are as follows: This invention provides a method and construction method for thermal spraying aluminum for corrosion protection of the grounding flat iron entry section of power equipment. Compared with the prior art, this invention sprays aluminum on the surface of the grounding flat iron entry section of power equipment, which can create a long-lasting anti-corrosion coating. The use of robotic thermal spraying equipment to automate the aluminum spraying operation on the grounding flat iron of power equipment can effectively control the spraying rate and spraying distance, ensuring the uniformity, integrity and quality of the aluminum coating. The construction method for the grounding flat iron entry section of power equipment can replace the corroded and fractured entry section, effectively isolate the harsh environment in which the flat iron is prone to corrosion, and provide long-term effective protection. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a schematic diagram of the overall process of the thermal spraying aluminum anti-corrosion method for the grounding flat iron entry section of power equipment according to the present invention.

[0018] Figure 2 This is a schematic diagram of the thermally sprayed aluminum anti-corrosion flat iron that needs to be replaced, as described in the thermally sprayed aluminum anti-corrosion method for the grounding flat iron entry section of the power equipment of the present invention.

[0019] Figure 3 This is a schematic diagram of the overall process of the on-site construction method for thermal spraying aluminum corrosion protection of flat iron entry section of power equipment according to the present invention. Detailed Implementation

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0022] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0023] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0024] Example 1 Reference Figures 1-2 The first embodiment of the present invention provides a method for thermal spraying aluminum for corrosion protection of the grounding flat iron entry point of power equipment, comprising the following steps: S1: Segment the electrical equipment that needs to be replaced; Specifically, the power equipment that needs to be replaced is divided into air-insulated sections, underground sections, and buried sections; Furthermore, the air section refers to the part exposed to the air and welded to the original power equipment casing lead-down section; The "underground section" refers to the part that needs to be thermally sprayed with aluminum, which is the part that is half above the soil interface and half buried in the soil after installation. The buried section refers to the part that is buried underground and welded to the buried ground mesh.

[0025] S2: Correct the position that needs to be processed; Specifically, the correction process at the location that needs to be processed involves rolling the flat iron in the ground section. The rolling process refers to the correction process on the surface of the steel in a cold state, so that the surface of the steel has no obvious concavity or loss. Furthermore, the correction process refers to the unfolding and correction before hot spraying aluminum onto the rolled flat iron, which is carried out in a cold environment. After correction, the steel surface should not have obvious concavities or damage, and the scratch depth should not be greater than 0.5 mm or more than 1 / 2 of the negative allowable deviation of the steel thickness.

[0026] S3: Perform detailed processing on the flat iron to be thermally sprayed with aluminum; Specifically, the detailed processing of the flat iron to be thermally sprayed with aluminum includes surface cleaning and surface protection treatment; Furthermore, the surface cleaning involves grinding the embedded section of the flat iron to be thermally sprayed with aluminum, with a grinding length of 300mm. 250mm, and the air section and grounding section of the flat iron do not require surface cleaning; The surface protection treatment involves using thermal spraying aluminum technology to prevent corrosion of the flat iron. Furthermore, the aforementioned thermal spraying aluminum technology is a metal surface protection technology, and its effectiveness is specifically reflected by the amount of coating used; the amount used includes, Theoretical paint usage refers to the amount of paint used in theory according to national regulations; Actual paint usage refers to the amount of paint used during actual operation. Specifically, the formula for calculating the theoretical amount of coating used is as follows: in, This represents the theoretical usage of the coating, expressed in kg. This indicates the thickness of the aluminum spray, measured in micrometers (µm). This indicates the density of the aluminum sprayed, in units of... S represents the theoretical area to be sprayed, n represents the number of coats to be sprayed, and m is the percentage content of solids in the paint, specifically expressed in two decimal places. The formula for calculating the actual amount of coating used is as follows: in, This represents the theoretical usage of the coating, expressed in kg. This indicates the thickness of the aluminum spray, measured in micrometers (µm). This indicates the density of the aluminum sprayed, in units of... S represents the theoretical area to be sprayed, n represents the number of coats to be sprayed, and m is the percentage content of solids in the paint, specifically expressed in two decimal places. This is a loss factor, which is significantly affected by the environment, as detailed below: When the actual operating ambient temperature differs significantly from the theoretical operating ambient temperature, the loss factor is generally set to 0.8. When the actual operating environment humidity differs significantly from the theoretical operating environment humidity, the loss factor is generally taken as 0.7. Failure to follow the specifications during actual operation will result in paint loss, with the loss factor typically set at 0.6.

[0027] S4: Anti-corrosion packaging treatment for flat iron; Specifically, the anti-corrosion packaging treatment for flat iron is mainly for the air section, buried section and upper weld of power equipment to prevent corrosion, and the packaging treatment needs to be carried out in accordance with the standard of "Materials and Connectors for Electrical Grounding Engineering". Furthermore, the standards include labeling standards, packaging standards, transportation standards, and storage standards; Specifically as follows:

[0028] Example 2 Reference Figure 3 This is a second embodiment of the present invention, providing a method for on-site construction of thermal spraying aluminum anti-corrosion for flat iron sections of power equipment underground, including: Excavate soil at the location of the existing grounding flat iron, ensuring that the depth and width of the excavation do not affect the welding operation of the grounding section and the original connecting grounding grid flat iron. The cut-off dimensions and location of the original grounding flat iron after excavation are determined based on the thermally sprayed aluminum flat iron. Specifically, the principle for determining the cut-off size and location of the original grounding flat iron after excavation based on the thermally sprayed aluminum flat iron is to ensure that the contact surface with the soil after backfilling is in the section where the thermally sprayed aluminum flat iron enters the ground, and also to ensure that the entire section passes through the gravel layer. In addition, it is also necessary to ensure that the air section and grounding grid section of the original grounding flat iron and the air section and buried section of the thermally sprayed aluminum flat iron have sufficient dimensions to be welded together.

[0029] Rust removal and reshaping of the original grounding flat iron air end and grounding grid end; Specifically, the rust removal and shaping of the original grounding flat iron air end and ground grid end is done by grinding the welds of the original grounding flat iron air section and ground grid section, which needs to expose the metal luster; Furthermore, if the interface of the grounding grid section is reduced due to corrosion, it should be cleaned and repaired by welding to ensure that it can be welded to the air section and buried section of the thermally sprayed aluminum flat iron. Before welding the flat iron, straighten, level and align the flat iron, cut off the excess length of the hot-sprayed aluminum flat iron embedded section and make the welding bevel. The assembly spot welding is the bevel assembly spot welding of the original grounding flat iron air section and the thermal spray aluminum air section, as well as the bevel assembly spot welding of the original grounding flat iron grounding grid and the thermal spray aluminum flat iron buried section. Select appropriate welding parameters and perform welding using manual arc welding. Specifically, when selecting appropriate welding parameters for electrode diameter, welding current, arc voltage, and welding speed in shielded metal arc welding, welders must be certified to perform the welding. The weld should be inspected with the naked eye or under a magnifying glass of no more than 10x. Welding defects such as shrinkage cavities, porosity, foreign non-metallic materials, and white spots are not allowed. Backfilling of power equipment with soil, wherein the backfilling must ensure that the soil interface is in the ground section and that there is crushed stone backfill. Specifically, when backfilling the power equipment, it is necessary to ensure that the soil interface is within the ground entry area. Furthermore, during backfilling, if there is gravel, it should be backfilled directly. To prevent the gravel from damaging the surface of the thermally sprayed aluminum, it is necessary to protect it by wrapping it with a flexible material.

[0030] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0031] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0032] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for on-site construction of thermal spraying aluminum anti-corrosion for flat iron sections of power equipment, characterized in that, include, The flat iron that needs to be replaced should be divided into sections, including air sections, underground sections, and buried sections. The air section is the part exposed to the air and welded to the original power equipment casing. The underground section refers to the thermally sprayed aluminum section, which is the part that is half above the soil interface and half buried in the soil after installation. The buried section refers to the part that is buried underground and welded to the buried ground mesh; Excavate soil at the location of the existing grounding flat iron, ensuring that the depth and width of the excavation do not affect the welding operation of the grounding section and the original connecting grounding grid flat iron. The cut-off dimensions and location of the original grounding flat iron after excavation are determined based on the thermally sprayed aluminum flat iron. Rust removal and reshaping of the original grounding flat iron air end and grounding grid end; Before welding the flat iron, straighten, level and align the flat iron, cut off the excess length of the hot-sprayed aluminum flat iron embedded section and make the welding bevel. Spot welding was performed on the bevel joints of the original grounding flat iron air section and the thermally sprayed aluminum air section, as well as on the bevel joints of the original grounding flat iron grounding grid and the buried section of the thermally sprayed aluminum flat iron. Select appropriate welding parameters and perform welding using manual arc welding. The weld should be inspected with the naked eye or under a magnifying glass of no more than 10x. Shrinkage cavities, looseness, foreign non-metallic materials and white spots are not allowed. Backfilling of power equipment with soil, wherein the backfilling must ensure that the soil interface is in the ground section and that there is crushed stone backfill. The principle for determining the cut-off size and location of the original grounding flat iron after excavation based on the thermally sprayed aluminum flat iron is as follows: After backfilling, the contact surface with the soil is in the section where the thermally sprayed aluminum flat iron is inserted. This section passes through the gravel layer as a whole. The original grounding flat iron air section and ground grid section have sufficient size to weld together with the thermally sprayed aluminum flat iron air section and buried section. When backfilling, if there is gravel, backfill directly with gravel and protect it by wrapping it with flexible material.

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