Steel structure anti-corrosion structure suitable for marine environment

Abstract

The utility model discloses a steel structure anti-corrosion structure suitable for a marine environment. Comprising a steel member, an aluminum-based corrosion-resistant and stain-resistant composite coating and a carbon fiber reinforced composite layer, wherein the aluminum-based corrosion-resistant and stain-resistant composite coating is formed by thermally spraying a composite powder core wire formed by a cylindrical aluminum sheath and a corrosion-resistant and stain-resistant composite powder core filled in the aluminum sheath on the outer surface of the steel member, and the carbon fiber reinforced composite layer is arranged outside the aluminum-based corrosion-resistant and stain-resistant composite coating. According to the steel structure anti-corrosion structure suitable for the marine environment, the aluminum-based anti-corrosion stain-resistant composite coating has the hole sealing effect, is high in corrosion resistance and has the anti-fouling and sterilizing functions, corrosion of microorganisms in seawater to the anti-corrosion structure and the steel structure can be reduced, the corrosion resistance of the steel structure is further improved, and the service life of the steel structure is prolonged. According to the anti-corrosion structure, the aluminum-based anti-corrosion stain-resistant composite coating is combined with the carbon fiber reinforced composite layer, so that effective anti-corrosion and protection effects on the steel structure can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel structure anti-corrosion, in particular to a steel structure anti-corrosion structure suitable for use in marine environments. Background Art

[0002] my country is a maritime country with a long coastline and rich coastal resources. Marine resources and industry have become one of the pillar industries of my country's economic development. However, the marine environment is complex. Marine projects such as cross-sea bridges, offshore survey platforms, oil and gas pipelines, and oil production platforms have long been eroded by waves, sea breezes, sunshine, and microorganisms in the water. Steel structures in the ocean are very susceptible to corrosion, causing catastrophic damage to engineering platforms.

[0003] At present, the commonly used marine steel structure anti-corrosion technologies are: coating, cathodic protection, electroplating or hot-dip metal coating, surface chemical treatment, physical vapor deposition (vacuum coating, ion plating), thermal spray coating. Although the coating method is easy to operate, it is susceptible to seawater impact and erosion, resulting in hollowing, cracking, peeling and failure of the coating. In addition, traditional heavy anti-corrosion coatings are not environmentally friendly and easily pollute the marine environment; cathodic protection requires special power supply and auxiliary materials, and workers need to be arranged to replace them regularly, which is labor-intensive; electroplating or hot-dip metal coating, surface chemical treatment, physical vapor deposition (vacuum coating, ion plating) and other methods are expensive and suitable for batch production of small workpieces, but not for large components and on-site construction; thermal spray coatings are porous, and chloride ions in seawater reach the surface of the steel structure through the gaps, which can easily cause corrosion of the steel structure.

[0004] Therefore, developing an anti-corrosion material for marine steel structures that can overcome the above problems is of great significance to steel structure anti-corrosion and economic development. Utility Model Content

[0005] The utility model provides a steel structure anti-corrosion structure suitable for use in marine environments to overcome the above problems.

[0006] In order to achieve the above purpose, the technical solution of the utility model is:

[0007] A steel structure anti-corrosion structure suitable for use in a marine environment, comprising:

[0008] Steel components;

[0009] Thermally spraying a composite powder core wire composed of a cylindrical aluminum outer skin and an anti-corrosion and anti-fouling composite powder core filled in the aluminum outer skin onto the outer surface of a steel member to form an aluminum-based anti-corrosion and anti-fouling composite coating; and

[0010] A carbon fiber reinforced composite layer is arranged outside the aluminum-based anti-corrosion and anti-fouling composite coating.

[0011] Furthermore, the carbon fiber reinforced composite layer adopts porous mesh fiber cloth and epoxy impregnation glue; the epoxy impregnation glue is an underwater epoxy impregnation glue, which is composed of epoxy resin and curing agent, and the ratio of the epoxy resin to the curing agent is 3:1.

[0012] Furthermore, the thickness of the aluminum-based anti-corrosion and anti-fouling composite coating ranges from 150 μm to 200 μm.

[0013] Furthermore, the thickness of the carbon fiber reinforced composite layer ranges from 160 μm to 200 μm.

[0014] Furthermore, the aluminum-based anti-corrosion and anti-fouling composite coating is sprayed by arc spraying.

[0015] The beneficial effects of the utility model are:

[0016] The utility model discloses an anti-corrosion structure for steel structures in marine environments. The aluminum-based anti-corrosion and anti-fouling composite coating has a sealing effect and high corrosion resistance. It also has anti-fouling and sterilization effects, and can reduce the erosion of microorganisms in seawater on the anti-corrosion structure and the steel structure, thereby further improving the corrosion resistance of the steel structure. The aluminum-based anti-corrosion and anti-fouling composite coating of the anti-corrosion structure combined with the setting of a carbon fiber reinforced composite layer can effectively protect the steel structure from corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a structural schematic diagram of a steel structure anti-corrosion structure suitable for use in a marine environment disclosed in an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the preparation process of an aluminum-based anti-corrosion and anti-fouling composite coating suitable for anti-corrosion of steel structures in marine environments disclosed in an embodiment of the utility model.

[0020] In the figure: 1. Steel component; 2. Aluminum-based anti-corrosion and stain-resistant composite coating; 21. Aluminum outer skin; 22. Anti-corrosion and stain-resistant composite powder core; 23. Composite powder core wire; 3. Carbon fiber reinforced composite layer. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1 The utility model provides a steel structure anti-corrosion structure suitable for use in a marine environment, comprising:

[0023] Steel member 1;

[0024] The aluminum-based anti-corrosion and anti-fouling composite coating 2 is formed by thermally spraying a composite powder core wire 23 formed by a cylindrical aluminum outer skin 21 and an anti-corrosion and anti-fouling composite powder core 22 filled in the aluminum outer skin 21 onto the outer surface of the steel component 1; and

[0025] A carbon fiber reinforced composite layer 3 is arranged outside the aluminum-based anti-corrosion and anti-fouling composite coating 2. The aluminum-based anti-corrosion and anti-fouling composite coating 2 is an aluminum-based anti-corrosion and anti-fouling composite coating in the prior art. Compared with other heavy anti-corrosion coatings, aluminum coatings are more environmentally friendly and do not pollute marine resources. In addition, the aluminum coating has high bonding strength, strong adhesion, high coating hardness, and is wear-resistant and impact-resistant. The anti-corrosion and anti-fouling composite powder core in the composite powder core wire 23 used in the aluminum-based anti-corrosion and anti-fouling composite coating 2 is also prior art. The anti-corrosion and anti-fouling composite powder core 22 generally includes a solvent, filling particles, and antibacterial nanoparticles. The function of the filling particles is to seal the holes. The function of the antibacterial nanoparticles is to inhibit the reproduction of bacteria. The function of the solvent is to prepare the filling particles and the antibacterial nanoparticles into a suspension, which is convenient for mixing the antibacterial nanoparticles with the filling particles and for the preparation of the composite powder core wire. In this embodiment, the anti-corrosion and anti-fouling composite powder core 22 is selected from acetone solution as a solvent, polymethyl methacrylate (Polymethyl The invention discloses an anti-corrosion and anti-fouling composite powder core composed of polymethyl methacrylate (PMMA) particles as filling particles and copper nanoparticles as antibacterial nanoparticles, so that the PMMA particles can seal the aluminum-based anti-corrosion and anti-fouling composite coating 2, thereby improving the corrosion resistance of the aluminum-based anti-corrosion and anti-fouling composite coating and the anti-corrosion structure; the copper nanoparticles can react with the extracellular proteins of bacteria in seawater, thereby changing the permeability of the bacterial membrane, and the copper nanoparticles can further combine with the nucleic acid in the cytoplasm and the nucleus, inhibiting the proliferation of bacteria, playing an anti-fouling and sterilization role, and reducing the microorganisms in seawater. Biological erosion, improve the corrosion resistance of the aluminum-based anti-corrosion and anti-fouling composite coating, preferably select a composite powder core wire 23 formed by an anti-corrosion and anti-fouling composite powder core with an acetone solution, polymethyl methacrylate particles and copper nanoparticles in a ratio of 20:4:3, and thermally spray it to form an aluminum-based anti-corrosion and anti-fouling composite coating 2; the surface of the carbon fiber reinforced composite material is hard after curing, and the tensile strength is above 3000MPa, which improves the stress performance of the steel structure and can effectively avoid damage to the coating caused by wave impact or other foreign objects collision. The carbon fiber itself has strong corrosion resistance and works in coordination with the internal coating structure. The double corrosion protection can effectively increase the anti-corrosion life.

[0026] The utility model discloses an anti-corrosion structure for steel structures in marine environments. Aluminum, polymethyl methacrylate and copper nanoparticles are combined to form a composite powder core wire material, which is sprayed onto the surface of the steel structure by thermal spraying technology, and is wrapped with a carbon fiber material on the outside. The polymethyl methacrylate has a sealing effect and is highly corrosion-resistant. The release of copper ions has an anti-fouling and sterilization effect, reducing the erosion of microorganisms in seawater. The carbon fiber material is wrapped on the outside and is wear-resistant and impact-resistant. The anti-corrosion structure can effectively protect the steel structure from corrosion.

[0027] In a specific embodiment, the carbon fiber reinforced composite layer 3 uses porous mesh fiber cloth and epoxy impregnation glue. Specifically, the porous mesh fiber cloth is a unidirectional fiber cloth with a porous rectangular grid structure. The calculated thickness of the unidirectional fiber cloth with a porous rectangular grid structure is 167μm, which ensures lightness while ensuring sufficient strength. The thickness of the fiber cloth is usually expressed in terms of calculated thickness rather than measured thickness. The utility model uses a first-level 300g carbon fiber cloth, and the calculated thickness of its single-layer cloth is 167μm. The fiber bundles are closely arranged and have high tensile strength; the epoxy impregnation glue is composed of epoxy resin and curing agent, and the ratio of epoxy resin to curing agent is 3:1. The density of the epoxy resin is 1.1g / cm 3 The curing agent density is 1.3 g / cm 3 .

[0028] In a specific embodiment, the thickness of the aluminum-based anti-corrosion and fouling-resistant composite coating 2 ranges from 150 μm to 200 μm, so as to reduce the erosion of seawater on the coating, achieve the effect of anti-fouling and sterilization, reduce the erosion of microorganisms in seawater, and improve the corrosion resistance of the coating; in this embodiment, the thickness of the aluminum-based anti-corrosion and fouling-resistant composite coating 2 is 170 μm, and the materials and dosage for preparing the anti-corrosion and fouling-resistant composite powder core of the aluminum-based anti-corrosion and fouling-resistant composite coating 2 are as follows: add 200 g of polymethyl methacrylate and 150 g of copper nanoparticles to every 1 L of acetone solution.

[0029] In a specific embodiment, the thickness range of the carbon fiber reinforced composite layer 3 is 160μm to 200μm, so as to improve the stress performance of the steel structure, and the carbon fiber reinforced composite layer has good corrosion resistance to further improve the corrosion resistance of the steel structure; in this embodiment, the thickness of the carbon fiber reinforced composite layer 3 is 190μm, and the carbon fiber reinforced composite layer 3 adopts porous mesh fiber cloth and underwater epoxy impregnation glue.

[0030] In a specific embodiment, the aluminum-based anti-corrosion and anti-fouling composite coating 2 is sprayed by arc spraying. Arc spraying can achieve uniform spraying over a large area with fast spraying speed and high efficiency. Arc spraying can form a dense, uniform, and highly adhesive spray layer with good coating quality.

[0031] The specific construction process of a steel structure anti-corrosion structure suitable for use in a marine environment disclosed in the utility model is as follows:

[0032] 1. Surface pretreatment of steel structure:

[0033] (1) Use ultra-high pressure water jet method to remove shellfish, algae and other organisms attached to the surface of the steel structure, and then use electric angle grinder to grind and remove dirt, remove the loose layer, and obtain a qualified pre-treated surface;

[0034] (2) Sandblasting and rust removal: Use a sandblasting machine to remove rust and roughen the surface of the steel structure to improve the bonding strength between the later spray coating and the steel structure; the sandblasting material is brown corundum, and the particle size composition is 0.5-2mm, of which 0.5-1mm accounts for 50% and 1-2mm accounts for 50%. The sandblasting pressure is 0.7MPa, the sandblasting angle is 60°-80°, and the sandblasting distance is 10-20mm;

[0035] (3) Dust removal: After sandblasting and rust removal, a portable vacuum cleaner should be used to remove dust from the metal surface to remove the remaining sand on the surface;

[0036] 2. Production of composite powder core wire:

[0037] (1) Preparation of suspension: Add polymethyl methacrylate particles to an acetone solution, mechanically stir until the polymethyl methacrylate is completely dissolved to obtain a viscous solution, and then evenly disperse copper nanoparticles in the solution to obtain a uniform suspension; the ratio of acetone solution, polymethyl methacrylate and copper nanoparticles is: add 200 g of polymethyl methacrylate and 150 g of copper nanoparticles to every 1 L of acetone solution.

[0038] (2) Preparation of composite powder core wire: The overall process is as follows Figure 2 As shown, the aluminum sheet is rolled into a groove shape by a forming roller machine ( Figure 2 b), use a brush to apply the prepared suspension into the groove ( Figure 2 c); Roll the groove-shaped aluminum sheet through the closing rollers to seal the edges ( Figure 2 d); put the rolled aluminum sheet into the feeding system of the wire drawing machine, and set the feeding rate to 0.1m / s to obtain the powder core wire ( Figure 2 e);

[0039] 3. Form an aluminum-based anti-corrosion and anti-fouling composite coating on the surface of steel components: After sandblasting and rust removal, the time interval on sunny days shall not exceed 12 hours, and on rainy or humid days shall not exceed 2 hours. Arc spraying equipment is used to spray the steel structure to form an aluminum-based anti-corrosion and anti-fouling composite coating;

[0040] The working current of the spraying equipment is 100A, the working voltage of the spraying is 32V, the distance between the spray gun and the surface of the steel structure is about 150mm, and the maximum distance shall not exceed 200mm; the compressed air pressure of the spray gun is 0.6MPa; the spraying angle of the spray gun is 60-90°, and the minimum cannot be less than 45°; the moving speed of the spray gun should be 300-400mm / s, and the moving speed should be uniform; the wire feeding speed of the aluminum wire is 2-2.2m / min to ensure that the powder core aluminum wire can be fully melted;

[0041] Arc spraying steel structure coating thickness is 0.15-0.2mm, and it should be completed in 3-4 times. The thickness of each aluminum spray layer should be uniform, generally 0.05mm, and adjacent spraying areas should have a 1 / 3 width overlap. The interval time of layered spraying should not exceed 1 hour. During the spraying of aluminum wire, do not touch the sprayed surface with your hands.

[0042] 4. Set up a carbon fiber reinforced composite layer: On the basis of the aluminum-based anti-corrosion and anti-fouling composite coating, a carbon fiber reinforced composite material is added on the outside for wrapping. The carbon fiber reinforced composite material is composed of a unidirectional fiber cloth with a porous rectangular grid structure and an underwater epoxy impregnating adhesive. The use of underwater epoxy impregnating adhesive solves the problem that conventional impregnating adhesives cannot be constructed underwater. The underwater epoxy impregnating adhesive can ensure the compatibility between the colloid and the fiber material during underwater maintenance construction. It has good mechanical properties and corrosion resistance, and has excellent fiber wetting ability; the underwater epoxy impregnating adhesive (the impregnating adhesive in application number 202210653425.7) is composed of component A and part B. Component A is mainly epoxy resin, and component B is mainly a curing agent. When used, components A and B are pressed according to Mix evenly according to the mass ratio of 3:1; specifically, first apply a layer of underwater epoxy impregnation glue on the outer surface of the coating as a primer, stick a porous mesh fiber cloth on the primer and repeatedly scrape and press with a scraper or roller to fully integrate the underwater epoxy impregnation glue into the porous mesh fiber cloth, finally apply another layer of underwater epoxy impregnation glue on the outer layer of the porous mesh fiber cloth, and repeatedly scrape and press until the underwater epoxy impregnation glue is uniform, so as to form a carbon fiber reinforced composite layer outside the aluminum-based anti-corrosion and anti-fouling composite coating.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A steel structure anti-corrosion structure suitable for use in a marine environment, characterized in that: include: Steel components (1); A composite powder core wire (23) composed of a cylindrical aluminum outer skin (21) and an anti-corrosion and anti-fouling composite powder core (22) filled in the aluminum outer skin (21) is thermally sprayed onto the outer surface of a steel component (1) to form an aluminum-based anti-corrosion and anti-fouling composite coating (2); and, A carbon fiber reinforced composite layer (3) is arranged outside the aluminum-based anticorrosive and antifouling composite coating (2).

2. The anti-corrosion structure for steel structures suitable for use in marine environments according to claim 1, characterized in that: The carbon fiber reinforced composite layer (3) is made of porous mesh fiber cloth and epoxy impregnated glue.

3. The anti-corrosion structure for steel structures suitable for use in marine environments according to claim 1, characterized in that: The thickness of the aluminum-based anti-corrosion and anti-fouling composite coating (2) is in the range of 150 μm to 200 μm.

4. The anti-corrosion structure for steel structures suitable for use in marine environments according to claim 1, characterized in that: The thickness of the carbon fiber reinforced composite layer (3) ranges from 160 μm to 200 μm.

5. The anti-corrosion structure for steel structures suitable for use in marine environments according to claim 1, characterized in that: The aluminum-based anti-corrosion and anti-fouling composite coating (2) is sprayed by electric arc spraying.

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