Anti-corrosion oil delivery pipe
By designing multi-layer coating structures and special grooves and micropores on oil pipelines, the adhesion between the coating and the substrate is enhanced, solving the problem of easy coating peeling and improving the durability and corrosion resistance of oil pipelines.
Patent Information
- Application Number
- CN202520381654.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-03-06
AI Technical Summary
Traditional oil pipelines are prone to corrosion in harsh environments, and their coatings are easily peeled off or detached, leading to an increased rate of electrochemical corrosion and affecting their service life and safety.
The coating employs a multi-layer structure, including a substrate, a first protective layer, a second protective layer, and a third protective layer, combined with gradient layers, spiral grooves, and honeycomb micropores to enhance the adhesion between the coating and the substrate and its anti-peel properties. Furthermore, ceramic particles and polyurethane materials are used to improve its impermeability and durability.
It significantly improves the adhesion and durability of the coating to the substrate, reduces stress concentration, enhances impermeability and high-temperature resistance, reduces the risk of corrosion and leakage, and extends the service life of pipelines.
Smart Images
Figure CN223677219U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of oil storage and transportation technology, more particularly to a kind of anticorrosive petroleum conveying pipe. BACKGROUND
[0002] Petroleum conveying pipe will face the conveying environment of adverse conditions including sulfur oil and gas, seawater, acidic soil in oil and gas conveying process, and long-term easy to lead to pipeline corrosion.
[0003] Traditional anticorrosive measures mainly rely on coating technology, however, peeling or local shedding phenomenon can easily occur between coating and base metal, once coating falls off, the place where coating falls off will form the electrochemical corrosion environment of "large cathode-small anode", and the local corrosion rate can be increased by more than 10 times, eventually leading to pipeline perforation, oil and gas leakage and other accidents, not only affect the service life of pipeline, but also bring huge safety hazards and high maintenance costs, and maintenance cost can reach 30%-50% of new pipeline.
[0004] Therefore, an anticorrosive petroleum conveying pipe with excellent anti-peeling and anti-shedding performance is designed. UTILITY MODEL CONTENT
[0005] The utility model aims at providing an anticorrosive petroleum conveying pipe to solve the problems in the above background technology.
[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an anticorrosive petroleum conveying pipe, comprising a base body and a coating, the coating is formed on the surface of the base body, the coating is divided into a first protective layer, a second protective layer and a third protective layer, a groove and a plurality of micropores are arranged on the outer surface of the base body, the first protective layer is sprayed on the outer surface of the base body, the second protective layer is coated on the outer surface of the first protective layer, and the third protective layer is sprayed on the outer surface of the base body.
[0007] Preferably, a gradient layer is arranged between the base body and the first protective layer.
[0008] Preferably, the material of the gradient layer is Al2O3-TiO2.
[0009] Preferably, the groove is spiral.
[0010] Preferably, the micropore is honeycomb-shaped.
[0011] Preferably, the second protective layer is provided with an appropriate amount of ceramic particles.
[0012] Preferably, the spraying frequency of the third protective layer is 3.
[0013] Compared with the prior art, the utility model has the beneficial effects that:
[0014] The utility model discloses a spiral groove is arranged on the surface of the base body, and the shear stress between the dispersed coating and the interface of the base body is guided through the spiral groove, stress concentration is avoided, and the durability and fatigue resistance of the coating and the base body combination part are improved.
[0015] The utility model discloses a honeycomb micro -hole is arranged on the surface of the base body, and the combination of the coating and the base body is further enhanced through " barbed effect", makes the coating more firmly adhere to the surface of the base body, and is not easy to fall off.
[0016] The utility model discloses adding the appropriate ceramic particles in the second protective layer, forms "labyrinth effect", effectively blocks the penetration of corrosive medium, and enhances the penetration resistance and mechanical strength of the coating.
[0017] The third protective layer in the utility model adopts polyurethane material, and the continuous and dense coating is formed through electrostatic spraying process, and the impact resistance and durability of the coating are further improved.
[0018] The utility model discloses setting Al2O3-TiO2 gradient layer between the first protective layer and the base body, and the interface stress between the coating and the base body is reduced through the gradual transition of the thermal expansion coefficient, so that the pipeline can keep the structural integrity and stability under the high temperature working environment, and the high temperature resistance of the pipeline is improved. DRAWINGS
[0019] Fig. 1 It is the three-dimensional structure schematic diagram of the utility model;
[0020] Fig. 2 It is the exploded schematic diagram of the utility model.
[0021] Marked number in drawing:1-base body, 2-coating, 3-first protective layer, 4-second protective layer, 5-third protective layer, 6-groove, 7-micro -hole, 8-gradient layer, 9-ceramic particle. SPECIFIC EMBODIMENT
[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.
[0023] Embodiment 1
[0024] As Figs. 1-2The anti-corrosion petroleum conveying pipe shown in the figure comprises a base body 1 and a coating 2, the coating 2 is formed on the surface of the base body 1, the coating 2 is divided into a first protective layer 3, a second protective layer 4 and a third protective layer 5, a plurality of micro-holes 7 and a groove 6 are arranged on the outer surface of the base body 1, the first protective layer 3 is sprayed on the outer surface of the base body 1, the second protective layer 4 is coated on the outer surface of the first protective layer 3, and the third protective layer 5 is sprayed on the outer surface of the base body 1; a gradient layer 8 is arranged between the base body 1 and the first protective layer 3; the material of the gradient layer 8 is Al2O3-TiO2; the groove 6 is spiral-shaped; the micro-holes 7 are honeycomb-shaped; a proper amount of ceramic particles 9 are arranged in the second protective layer 4; and the spraying times of the third protective layer 5 are three.
[0025] The spiral groove 6 is arranged on the surface of the base body 1, the shear stress between the dispersed coating 2 and the interface of the base body 1 is guided through the spiral groove 6, stress concentration is avoided, and therefore the durability and fatigue resistance of the combined part of the coating 2 and the base body 1 are improved; the micro-holes 7 in the honeycomb shape are arranged on the surface of the base body 1, the bonding force between the coating 2 and the base body 1 is further enhanced through the “barb effect”, and the coating 2 is more firmly attached to the surface of the base body 1 and is not easy to fall off; the proper amount of ceramic particles 9 are added in the second protective layer 4, a “labyrinth effect” is formed, the penetration of the corrosion medium is effectively blocked, and the anti-permeability and mechanical strength of the coating 2 are enhanced.
[0026] The third protective layer 5 in the utility model adopts polyurethane material, a continuous and dense coating 2 is formed through the electrostatic spraying process, and the impact resistance and durability of the coating 2 are further improved; the Al2O3-TiO2 gradient layer 8 is arranged between the first protective layer 3 and the base body 1, the interface stress between the coating 2 and the base body 1 is reduced through the gradual transition of the thermal expansion coefficient, the structural integrity and stability of the pipeline can be maintained under the high-temperature working environment, and the high-temperature resistance of the pipeline is significantly improved.
[0027] Example 2
[0028] As Figs. 1-2 shown in the figure, an anti-corrosion petroleum conveying pipe comprises a pipeline body and a coating 2, wherein the pipeline body can also be referred to as a base body 1, the base body 1 can be common carbon steel or corrosion-resistant alloy steel material, the corrosion-resistant alloy steel material mainly resists harsh environments such as sulfur-containing oil and gas, seawater and acidic soil, and compared with alloy steel, carbon steel has high cost performance and is suitable for long-distance pipelines, and the preparation material is determined according to actual conditions.
[0029] It should be noted that the pipeline mainly relies on coating 2 for corrosion protection. If coating 2 peels off from the base metal 1 or partially falls off, an electrochemical corrosion "large cathode-small anode" will form at the detachment site, increasing the local corrosion rate by more than 10 times. The resulting pitting corrosion may lead to pipeline perforation, oil and gas leaks and other accidents. In addition, the maintenance cost can reach 30%-50% of that of a newly built pipeline. Therefore, the peel resistance and anti-detachment performance of coating 2 directly determines the protection life.
[0030] First, the substrate 1 needs to undergo surface treatment to increase the adhesion of the coating 2. In this embodiment, a spiral groove 6 is engraved on the surface of the substrate 1. The width of the spiral groove 6 can be precisely between 0.5 mm and 1 mm, and the depth can be precisely between 0.3 mm and 0.5 mm. By creating the groove 6, the actual contact area between the coating 2 and the substrate 1 is increased. When the coating 2 is evenly applied or sprayed onto the substrate 1, it can more fully fill and penetrate into the spiral groove 6, forming a tighter and stronger bond. Furthermore, the spiral groove 6 can also effectively disperse the shear stress between the coating 2 and the substrate 1 interface. When subjected to external force, these stresses will be guided and dispersed to a larger area by the spiral groove 6, so that the stress is not concentrated on a single plane or point, effectively improving the durability and fatigue resistance of the bonding part between the coating 2 and the substrate, making the overall structure more stable and reliable.
[0031] Secondly, in this embodiment, micropores 7 are uniformly formed on other parts of the substrate surface located outside the spiral groove 6. The micropores 7 are laser-engraved into a honeycomb shape. The diameter of the micropores 7 can be accurately between 20 and 50 micrometers, and the depth is accurately within the range of 100 to 200 micrometers. When the coating 2 is uniformly applied or sprayed onto the substrate 1, it can penetrate deeply into every micropore. As the coating 2 penetrates and cures, a unique "barbed effect" will be formed inside the pores, which greatly enhances the bonding force between the coating 2 and the substrate 1, making the coating 2 more firmly attached to the surface of the substrate 1 and less likely to fall off.
[0032] Example 3
[0033] like Figs. 1-2 The corrosion-resistant oil pipeline shown is prepared by uniformly applying or spraying coating 2 onto substrate 1. Coating 2 is divided into a first protective layer 3, a second protective layer 4, and a third protective layer 5. The first protective layer 3 is sprayed onto the outer surface of substrate 1. Specifically, high-pressure airless spraying equipment is used to apply epoxy resin primer, with a wet film thickness of about 90μm. It is cured at room temperature for 24 hours or baked at 80℃ for 1 hour to form chemical bonds. At the same time, the primer penetrates into the honeycomb micropores 7. After curing, a mechanical interlocking structure is formed. During the process, it is necessary to ensure that the primer completely fills the micropores 7. After curing, there are no bubbles or voids.
[0034] The second protective layer 4 is still selected from epoxy resin, but the epoxy resin needs to be pretreated by mixing ceramic particles 9 with a particle size of 1-5 μm into the epoxy resin at a volume ratio of 20%-30%, and then the epoxy resin with ceramic particles 9 is coated on the first protective layer 3 by using a scraper or other tools. The ceramic particles 9 form a "labyrinth effect" to block the corrosion medium. The epoxy resin is pre-cured at 80°C for 1 hour, and then cured at 120°C for 2 hours to ensure the impermeability and mechanical strength.
[0035] The third protective layer 5 is selected from polyurethane to improve its impact resistance. The polyurethane is applied by using an electrostatic spraying process, so that the polyurethane coating particles are uniformly adsorbed to the surface of the pipeline under the action of electric field force, forming a continuous and dense coating 2. The polyurethane needs to be coated in 2-3 passes to ensure that the third protective layer 5 reaches the required thickness and uniformity, and at the same time, the overall strength and durability of the coating 2 are enhanced. During the coating and curing of the third protective layer 5, low temperature, such as 60-80°C, is used for baking to avoid damage to the second protective layer 4 caused by high temperature.
[0036] Example 4
[0037] As shown in Figs. 1-2 a kind of anticorrosion petroleum conveying pipe, a gradient layer 8 is coated between the first protective layer 3 and the base body 1. The gradient layer 8 is selected from Al2O3-TiO2 composite powder. The powder is heated to a molten or semi-molten state and then sprayed at high speed to the surface of the base body 1. During the process, the powder particles rapidly cool and solidify to form a gradient layer 8 with a thickness of 50 to 100 microns, a dense structure and a gradually changing composition. In this way, the base body 1 gradually transitions to the ceramic coating 2, i.e. by reducing the thermal expansion coefficient gradient to reduce the interfacial stress between the coating 2 and the base body 1, so that the pipeline can maintain the integrity and stability of the structure when it is in a high-temperature working environment, significantly improving its high-temperature resistance.
[0038] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... " does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.
[0039] The above merely aims to explain the technical scheme of the present application and is not intended to limit the present application. Other modifications or equivalent replacements made by those skilled in the art to the technical scheme of the present application, as long as they do not depart from the spirit and scope of the present application, should be included in the scope of the claims of the present application.
Claims
1. A corrosion resistant petroleum transporting pipe comprising a base and a coating layer formed on the surface of the base, characterized in that, The coating is divided into a first protective layer, a second protective layer and a third protective layer, the outer surface of the substrate is provided with grooves and a plurality of micropores, the first protective layer is sprayed on the outer surface of the substrate, the second protective layer is coated on the outer surface of the first protective layer, and the third protective layer is sprayed on the outer surface of the substrate.
2. A corrosion-proof oil delivery pipe according to claim 1, characterized in that A gradient layer is arranged between the substrate and the first protective layer.
3. A corrosion-proof oil delivery pipe according to claim 2, characterized in that The material of the gradient layer is Al2O3-TiO2.
4. A corrosion-proof oil delivery pipe according to claim 1, characterized in that The grooves are spiral-shaped.
5. A corrosion-proof oil delivery pipe according to claim 1, characterized in that The micropores are honeycomb-shaped.
6. A corrosion-proof oil delivery pipe according to claim 1, characterized in that An appropriate amount of ceramic particles are arranged in the second protective layer.
7. A corrosion-proof oil delivery pipe according to claim 1, characterized in that The spraying times of the third protective layer are 3.