Outdoor cable accessory with corrosion resistance

Abstract

This invention relates to the field of optical cable installation accessories, and discloses a corrosion-resistant outdoor optical cable fitting. The fitting comprises a substrate and a surface anti-corrosion coating. The substrate formulation consists of low-carbon steel, aluminum, zinc, magnesium, titanium, rare earth elements, and boron; the rare earth elements are one or two of cerium and lanthanum mixed in any proportion. The surface anti-corrosion coating formulation includes a matrix component and a functional component. This corrosion-resistant outdoor optical cable fitting uses low-carbon steel as the substrate, with added alloying elements such as aluminum, zinc, magnesium, and titanium, as well as rare earth elements. Through the synergistic effect of these components, the substrate grains are refined, improving the mechanical strength and corrosion resistance of the substrate, while also improving its forging performance. The surface anti-corrosion coating uses an inorganic-organic composite system, which can form a dense anti-corrosion barrier to block the penetration of corrosive media, achieve in-situ self-repair of microcracks, and provide cathodic protection, significantly improving the corrosion resistance of the fitting.

Description

Technical Field

[0001] This invention relates to the field of optical cable installation accessories, specifically to an outdoor optical cable fitting with corrosion resistance. Background Technology

[0002] Outdoor fiber optic cable fittings are specialized equipment used to fix and connect towers and fiber optic cables in high-voltage power transmission and communication lines. Designed for a service life of over 30 years, they are exposed to the high-altitude natural environment for extended periods after installation, directly subjected to sunlight, wind, rain, and corrosive media such as chemical pollutants and salt spray. Accumulated dust on their surface further accelerates the corrosion process of the metal components. Furthermore, in high-voltage transmission lines, the fittings are also exposed to strong electromagnetic fields, where electrochemical reactions exacerbate the corrosion of the metal substrate, leading to decreased mechanical strength and shortened service life. In severe cases, this can cause fitting damage, fiber optic cable slippage or breakage, affecting the safe operation of the high-voltage power transmission and communication lines.

[0003] Currently, most outdoor optical cable fittings use aluminum-clad steel wire or ordinary stainless steel as the base material, and the surface is treated with hot-dip galvanizing, epoxy coating, Dacromet coating, etc. for corrosion protection. However, these methods have significant limitations: the galvanized layer is prone to hydrogen evolution corrosion or passivation film rupture in acidic or alkaline environments, resulting in a rapid corrosion rate; the Dacromet coating has numerous micropores, which can easily become channels for corrosive media penetration in humid environments; and the epoxy resin coating faces problems of UV aging and thermal stress cracking, with insufficient adhesion between the coating and the metal substrate, making it prone to interfacial delamination. Furthermore, existing fitting formulations lack highly efficient and synergistic anti-corrosion components, failing to balance corrosion resistance, mechanical strength, and process compatibility, making it difficult to meet the needs of use in extreme corrosive environments such as coastal areas and industrial zones.

[0004] Therefore, developing an outdoor optical cable fitting with a reasonable formula, simple preparation, and excellent corrosion resistance, high strength, and high adhesion to solve the technical problems of insufficient corrosion resistance and short service life of existing products has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a corrosion-resistant outdoor optical cable fitting. By optimizing the substrate formula and surface anti-corrosion coating formula, combined with a scientific manufacturing process, it achieves a synergistic improvement in the fitting's corrosion resistance, mechanical strength, and process adaptability, extending the fitting's service life and reducing maintenance costs. This solves the problems of poor corrosion resistance, short service life, and inability to adapt to complex corrosive environments in existing outdoor optical cable fittings.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a corrosion-resistant outdoor optical cable fitting, the fitting comprising a substrate and a surface anti-corrosion coating, comprising the following materials in parts by weight: Substrate formulation: The substrate is an alloy substrate, and its components, by mass parts, include: Low carbon steel 65-75 parts, aluminum 10-15 parts, zinc 5-8 parts, magnesium 2-4 parts, titanium 1-2 parts, rare earth elements 0.5-1 parts, boron 0.1-0.3 parts; Among them, rare earth elements are one or two of cerium and lanthanum mixed in any proportion, used to refine the grain of the substrate and improve the corrosion resistance and mechanical strength of the substrate; boron is used to improve the forging performance of the substrate and avoid cracks during the preparation process. Surface anti-corrosion coating formulation: The surface anti-corrosion coating is an inorganic-organic composite coating, applied to the surface of the substrate. By weight, the components include: 60-70 parts matrix component, 30-40 parts functional component; The matrix components, by mass parts, include: 50-55 parts epoxy-organic silicone composite resin, 2-3 parts titanate coupling agent, 25-30 parts mixed solvent, and 8-10 parts nano-alumina; wherein, the mixed solvent is xylene and acetone mixed in a volume ratio of 1:1, and the nano-alumina has a particle size of 20-50nm, which is used to improve the density and wear resistance of the coating. The functional components, by mass parts, include: 30-35 parts polyurethane prepolymer, 15-18 parts graphene-modified zinc powder, 10-12 parts photothermal-responsive microcapsules, 5-6 parts nano-silica, and 2-3 parts dimethylethanolamine; wherein, the graphene-modified zinc powder is graphene-coated zinc powder with a particle size of 10-20 μm and a coating rate ≥90%, which can form cathodic protection and inhibit electrochemical corrosion; the photothermal-responsive microcapsules use bisphenol A epoxy resin and dicyandiamide curing agent as core materials and polydopamine as wall materials, with a particle size of 5- The capsule is 10μm in diameter and has a wall thickness of 200-300nm. Under near-infrared light irradiation at a wavelength of 808nm, it can rupture within 10s to release the repair agent, achieving in-situ repair of microcracks. The nano-silica particles have a diameter of 30-50nm and are used to strengthen the coating interface structure and improve the coating's crack resistance. The substrate formulation, by mass parts, includes: 70 parts low-carbon steel, 12 parts aluminum, 6 parts zinc, 3 parts magnesium, 1.5 parts titanium, 0.8 parts rare earth elements, and 0.2 parts boron. The rare earth elements are cerium and lanthanum mixed in a mass ratio of 1:1.

[0007] The surface anti-corrosion coating formulation, by weight, comprises: 65 parts of matrix component and 35 parts of functional component; the matrix component includes 52 parts of epoxy-organic silicone composite resin, 2.5 parts of titanate coupling agent, 28 parts of mixed solvent, and 7.5 parts of nano-alumina; the functional component includes 32 parts of polyurethane prepolymer, 16 parts of graphene-modified zinc powder, 11 parts of photothermal responsive microcapsules, 5.5 parts of nano-silica, and 2.5 parts of dimethylethanolamine.

[0008] Preferably, the preparation method includes five steps: substrate preparation, substrate pretreatment, surface anti-corrosion coating preparation, coating application and curing, and post-treatment, as detailed below: S1, Substrate preparation; S2, Substrate pretreatment; S3. Preparation of surface anti-corrosion coating; S4. Coating application and curing; S5, Post-processing.

[0009] Preferably, the substrate preparation is as follows: S101. According to the above-mentioned base material formula, accurately weigh the low carbon steel, aluminum, zinc, magnesium, titanium, rare earth elements and boron components, put the low carbon steel into the medium frequency induction furnace, heat to 1500-1550℃, hold for 30-40 minutes, and let it melt completely. S102. Add aluminum, zinc, magnesium and titanium sequentially to the molten low carbon steel, stir evenly, stir at a speed of 300-400 r / min for 15-20 min, and hold at the temperature for 20-25 min to ensure that the metal components are fully fused. S103. Add rare earth elements and boron to the above molten metal liquid, continue stirring for 10-15 minutes, reduce the stirring speed to 200-250 r / min, and then let it stand for 10-15 minutes to remove the scum on the surface of the molten liquid. S104. Pour the treated molten metal into a prefabricated hardware mold, and shape it using gravity casting process. The casting temperature is controlled at 1400-1450℃. After cooling to room temperature, demold to obtain a rough hardware substrate. S105. Place the rough metal fitting substrate into an annealing furnace for annealing treatment at a temperature of 600-650℃ for 2-3 hours. Then, slowly cool it to room temperature at a rate of 50-80℃ / h to eliminate internal stress in the substrate, refine the grains, and improve the toughness and corrosion resistance of the substrate.

[0010] Preferably, the substrate pretreatment is as follows: S201. Use a grinding machine to grind the rough surface of the hardware substrate to remove the oxide scale, burrs and casting defects on the surface. After grinding, use sandpaper to polish the surface so that the surface roughness Ra of the substrate reaches 30-50μm. S202. The substrate after grinding and polishing is sandblasted. Quartz sand is used as the sandblasting medium. The sandblasting pressure is controlled at 0.3-0.5MPa and the sandblasting time is 5-8min. This makes the substrate surface uniformly rough and enhances the adhesion between the coating and the substrate. S203. Place the sandblasted substrate into a cleaning tank and ultrasonically clean it with anhydrous ethanol for 15-20 minutes at an ultrasonic power of 300-400W to remove dust, oil, and sandblasting residue from the substrate surface. S204. Place the cleaned substrate into a drying oven and dry it at 80-100℃ for 20-30 minutes. After drying, take it out and cool it to room temperature to obtain the pretreated hardware substrate for later use.

[0011] Preferably, the surface anti-corrosion coating is prepared as follows: S301. Preparation of matrix components: According to the matrix component formula, epoxy-organic silicone composite resin and titanate coupling agent are added to the mixed solvent and stirred evenly at a stirring speed of 250-300 r / min for 10-15 min. Then, nano-alumina is added sequentially and ultrasonically dispersed for 20-30 min at an ultrasonic power of 400-500 W to ensure uniform dispersion of nano-alumina, thus obtaining the matrix components for later use. S301. Preparation of functional components: According to the functional component formulation, polyurethane prepolymer, graphene-modified zinc powder, and nano-silica are added to deionized water and emulsified by high-speed shearing at a shear rate of 1500-2000 r / min for 20-30 min. Then, photothermal responsive microcapsules and dimethylethanolamine are added and mixed uniformly by low-speed stirring at a stirring rate of 100-150 r / min for 10-15 min. The mixture is then allowed to stand for 5-10 min to defoam, yielding the functional components for later use. S301. Preparation of composite coating: Mix the prepared matrix component and functional component at a mass ratio of 1:0.5-0.7, stir evenly at a stirring speed of 300-350 r / min for 15-20 min, let stand for 5-10 min to remove air bubbles generated during the mixing process, and obtain a surface anti-corrosion composite coating for later use.

[0012] Preferably, the coating application and curing are as follows: S401. Using plasma spraying technology, the surface anti-corrosion composite coating prepared in step 3 is applied to the surface of the pretreated hardware substrate obtained in step 2. The spraying pressure is controlled at 0.4-0.6MPa, the spraying distance is 150-200mm, the spraying temperature is 180-220℃, and the coating thickness is controlled at 250-300μm to ensure that the coating is uniform, free of bubbles and cracks. S401. Place the coated hardware into a curing oven for staged curing: In the first stage, keep the temperature at 50-60℃ for 30-40 minutes to allow the coating to cure initially; in the second stage, raise the temperature to 120-140℃ and keep the temperature for 60-90 minutes to allow the coating to cure completely; after curing, slowly cool to room temperature at a rate of 60-80℃ / h to avoid cracking of the coating due to excessive temperature difference.

[0013] Preferably, the post-processing is as follows: S501. Polish the surface of the cured hardware to remove coating defects, drips and burrs, so that the surface of the hardware is smooth and flat and the coating thickness is uniform. S501. Conduct corrosion resistance testing, mechanical strength testing, and coating adhesion testing on the fittings, and reject unqualified products. S501. Clean and dry qualified products, and then use moisture-proof packaging to obtain finished outdoor optical cable hardware with corrosion resistance.

[0014] Compared with the prior art, the present invention provides an outdoor optical cable fitting with corrosion resistance, which has the following beneficial effects: 1. This corrosion-resistant outdoor optical cable fitting uses low-carbon steel as the base material, with added alloying elements such as aluminum, zinc, magnesium, and titanium, as well as rare earth elements. Through the synergistic effect of these components, the grain size of the base material is refined, improving its mechanical strength and corrosion resistance. At the same time, the forging performance of the base material is improved, avoiding defects during the manufacturing process. The surface anti-corrosion coating adopts an inorganic-organic composite system, introducing functional components such as graphene-modified zinc powder and photothermal responsive microcapsules. This not only forms a dense anti-corrosion barrier to block the penetration of corrosive media, but also enables in-situ self-repair of microcracks and provides cathodic protection, significantly improving the corrosion resistance of the fitting and making it suitable for extreme and complex environments such as coastal salt spray and industrial corrosion.

[0015] 2. This corrosion-resistant outdoor optical cable fitting features a simple and highly controllable manufacturing process. The substrate is prepared through steps such as medium-frequency induction melting, gravity casting, and annealing, effectively eliminating internal stress and improving substrate toughness. Substrate pretreatment combines grinding, sandblasting, and ultrasonic cleaning to enhance the adhesion between the coating and the substrate. The coating employs plasma spraying and segmented curing processes to ensure a uniform, dense, crack-free coating with strong adhesion, solving the technical problems of easy peeling and cracking in existing coatings, making it suitable for large-scale industrial production. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the manufacturing process of the outdoor optical cable fittings of this invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0018] A formulation and preparation method for a corrosion-resistant outdoor optical cable fitting are disclosed below: formula Substrate formulation (parts by weight): 65 parts low carbon steel, 10 parts aluminum, 5 parts zinc, 2 parts magnesium, 1 part titanium, 0.5 parts cerium, and 0.1 parts boron; Surface anti-corrosion coating formulation (parts by weight): 60 parts matrix component, 30 parts functional component; Matrix components: 50 parts epoxy-organic silicone composite resin, 2 parts titanate coupling agent, 25 parts xylene-acetone mixed solvent (1:1), and 8 parts nano alumina; Functional components: 30 parts polyurethane prepolymer, 15 parts graphene-modified zinc powder, 10 parts photothermal responsive microcapsules, 5 parts nano silica, and 2 parts dimethylethanolamine.

[0019] Preparation method Step 1: Substrate Preparation Place 65 parts of low carbon steel into a medium frequency induction furnace, heat to 1500℃, hold for 30 minutes, and melt completely; add 10 parts of aluminum, 5 parts of zinc, 2 parts of magnesium, and 1 part of titanium, stir at 300 r / min for 15 minutes, and hold for 20 minutes; add 0.5 parts of cerium and 0.1 parts of boron, stir at 200 r / min for 10 minutes, let stand for 10 minutes to remove slag; gravity casting at 1400℃, cool to room temperature and demold to obtain a rough base material; anneal at 600℃ for 2 hours, and slowly cool to room temperature at 50℃ / h.

[0020] Step 2: Substrate Pretreatment Grind and polish the rough substrate to achieve Ra of 30μm; blast with 0.3MPa sand for 5min using quartz sand as the medium; ultrasonically clean with anhydrous ethanol for 15min (300W); dry at 80℃ for 20min, and cool to room temperature for later use.

[0021] Step 3: Preparation of surface anti-corrosion coating Matrix component: 50 parts epoxy-organosilicon composite resin, 2 parts titanate coupling agent, and 25 parts mixed solvent were added and stirred at 250 r / min for 10 min. Then, 8 parts nano alumina were added and ultrasonically dispersed at 400 W for 20 min. Functional component: 30 parts polyurethane prepolymer, 15 parts graphene-modified zinc powder, and 5 parts nano silica were added to deionized water and sheared at 1500 r / min for 20 min. Then, 10 parts photothermal responsive microcapsules and 2 parts dimethylethanolamine were added and stirred at 100 r / min for 10 min. The mixture was allowed to stand for 5 min to defoam. The matrix component and functional component were mixed at a ratio of 1:0.5, stirred at 300 r / min for 15 min, and allowed to stand for 5 min to defoam.

[0022] Step 4: Coating application and curing Plasma spraying, 0.4MPa pressure, 150mm distance, 180℃ temperature, coating thickness 250μm; segmented curing: 50℃ for 30min, 120℃ for 60min, cooling to room temperature at 60℃ / h.

[0023] Step 5: Post-processing After the coating is polished and tested to ensure it passes inspection, it is cleaned, dried, and packaged in a moisture-proof manner to obtain the finished product. Example

[0024] A formulation and preparation method for a corrosion-resistant outdoor optical cable fitting are disclosed below: formula Substrate formulation (parts by weight): 70 parts low carbon steel, 12 parts aluminum, 6 parts zinc, 3 parts magnesium, 1.5 parts titanium, 0.4 parts cerium, 0.4 parts lanthanum, and 0.2 parts boron; Surface anti-corrosion coating formulation (parts by weight): 65 parts matrix component, 35 parts functional component; Matrix components: 52 parts epoxy-organic silicone composite resin, 2.5 parts titanate coupling agent, 28 parts xylene-acetone mixed solvent (1:1), and 7.5 parts nano alumina; Functional components: 32 parts polyurethane prepolymer, 16 parts graphene-modified zinc powder, 11 parts photothermal responsive microcapsules, 5.5 parts nano silica, and 2.5 parts dimethylethanolamine.

[0025] Preparation method Step 1: Substrate Preparation 70 parts of low-carbon steel were placed in a medium-frequency induction furnace and heated to 1520℃. The temperature was held for 35 minutes until completely melted. 12 parts of aluminum, 6 parts of zinc, 3 parts of magnesium, and 1.5 parts of titanium were added. The mixture was stirred at 350 r / min for 18 minutes and held for 22 minutes. 0.4 parts of cerium, 0.4 parts of lanthanum, and 0.2 parts of boron were added. The mixture was stirred at 220 r / min for 12 minutes and allowed to stand for 12 minutes to remove slag. The mixture was then gravity cast at 1420℃ and cooled to room temperature to demold, yielding a rough base material. The mixture was annealed at 620℃ for 2.5 hours and then slowly cooled to room temperature at 60℃ / hour.

[0026] Step 2: Substrate Pretreatment Grind and polish the rough substrate to achieve Ra 40μm; blast with 0.4MPa sand for 6min using quartz sand as the medium; ultrasonically clean with anhydrous ethanol for 18min (350W); dry at 90℃ for 25min, and cool to room temperature for later use.

[0027] Step 3: Preparation of surface anti-corrosion coating Matrix component: 52 parts epoxy-organosilicon composite resin and 2.5 parts titanate coupling agent were added to 28 parts mixed solvent, stirred at 280 r / min for 12 min, and 7.5 parts nano alumina were added. The mixture was ultrasonically dispersed at 450 W for 25 min. Functional component: 32 parts polyurethane prepolymer, 16 parts graphene-modified zinc powder, and 5.5 parts nano silica were added to deionized water, sheared at 1800 r / min for 25 min, and 11 parts photothermal responsive microcapsules and 2.5 parts dimethylethanolamine were added. The mixture was stirred at 120 r / min for 12 min and allowed to stand for 8 min to defoam. The matrix component and functional component were mixed at a ratio of 1:0.6, stirred at 320 r / min for 18 min, and allowed to stand for 8 min to defoam.

[0028] Step 4: Coating application and curing Plasma spraying, 0.5MPa pressure, 180mm distance, 200℃ temperature, coating thickness 280μm; segmented curing: 55℃ for 35min, 130℃ for 75min, cooling to room temperature at 70℃ / h.

[0029] Step 5: Post-processing After the coating is polished and tested to ensure it passes inspection, it is cleaned, dried, and packaged in a moisture-proof manner to obtain the finished product. Example

[0030] A formulation and preparation method for a corrosion-resistant outdoor optical cable fitting are disclosed below: formula Substrate formulation (parts by weight): 75 parts low carbon steel, 15 parts aluminum, 8 parts zinc, 4 parts magnesium, 2 parts titanium, 1 part lanthanum, and 0.3 parts boron; Surface anti-corrosion coating formulation (parts by weight): 70 parts matrix component, 40 parts functional component; Matrix components: 55 parts epoxy-organic silicone composite resin, 3 parts titanate coupling agent, 30 parts xylene-acetone mixed solvent (1:1), and 10 parts nano alumina; Functional components: 35 parts polyurethane prepolymer, 18 parts graphene-modified zinc powder, 12 parts photothermal responsive microcapsules, 6 parts nano silica, and 3 parts dimethylethanolamine.

[0031] Preparation method Step 1: Substrate Preparation 75 parts of low carbon steel were placed in a medium-frequency induction furnace and heated to 1550℃. The temperature was held for 40 minutes until completely melted. 15 parts of aluminum, 8 parts of zinc, 4 parts of magnesium, and 2 parts of titanium were added. The mixture was stirred at 400 r / min for 20 minutes and held for 25 minutes. 1 part of lanthanum and 0.3 parts of boron were added. The mixture was stirred at 250 r / min for 15 minutes and allowed to stand for 15 minutes to remove slag. The mixture was then gravity cast at 1450℃ and cooled to room temperature to demold, yielding a rough base material. The mixture was annealed at 650℃ for 3 hours and then slowly cooled to room temperature at 80℃ / h.

[0032] Step 2: Substrate Pretreatment Grind and polish the rough substrate to achieve Ra of 50μm; blast with 0.5MPa sand for 8 minutes using quartz sand as the medium; ultrasonically clean with anhydrous ethanol for 20 minutes (400W); dry at 100℃ for 30 minutes, and cool to room temperature for later use.

[0033] Step 3: Preparation of surface anti-corrosion coating Matrix component: 55 parts epoxy-organic silicone composite resin, 3 parts titanate coupling agent, and 30 parts mixed solvent were added and stirred at 300 r / min for 15 min. Then, 10 parts nano alumina were added and ultrasonically dispersed at 500 W for 30 min. Functional component: 35 parts polyurethane prepolymer, 18 parts graphene-modified zinc powder, and 6 parts nano silica were added to deionized water and sheared at 2000 r / min for 30 min. Then, 12 parts photothermal responsive microcapsules and 3 parts dimethylethanolamine were added and stirred at 150 r / min for 15 min. The mixture was allowed to stand for 10 min to defoam. The matrix component and functional component were mixed at a ratio of 1:0.7, stirred at 350 r / min for 20 min, and allowed to stand for 10 min to defoam.

[0034] Step 4: Coating application and curing Plasma spraying, 0.6MPa pressure, 200mm distance, 220℃ temperature, coating thickness 300μm; segmented curing: 60℃ for 40min, 140℃ for 90min, cooling to room temperature at 80℃ / h.

[0035] Step 5: Post-processing After the coating is polished and tested to ensure it passes inspection, it is cleaned, dried, and packaged in a moisture-proof manner to obtain the finished product.

[0036] Performance testing The outdoor optical cable fittings prepared in Examples 1-3 above were compared with conventional galvanized optical cable fittings in terms of performance. The test items and results are shown in the table below: Testing items Example 1 Example 2 Example 3 Existing products Testing standards Neutral salt spray corrosion resistance time 2000h 2500h 2300h 500h ASTM B117 Corrosion rate (mm / year) 0.02 0.015 0.018 0.15 GB / T 10125 Tensile strength retention rate (%) 90 95 92 70 GB / T 20138 Coating adhesion (MPa) 15 18 16 8 ISO 4624 Service life (years) 35 40 38 25 industry standards As can be seen from the above test results, the outdoor optical cable fittings prepared by the present invention have significantly better corrosion resistance, mechanical strength, coating adhesion and service life than existing conventional products. Among them, Example 2 is the optimal solution, and all performance indicators reach the best level, which can fully meet the needs of use in complex outdoor corrosive environments.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant outdoor optical cable fitting, comprising a base material and a surface anti-corrosion coating, characterized in that: The materials include the following parts by weight: The substrate formulation consists of: 65-75 parts low-carbon steel, 10-15 parts aluminum, 5-8 parts zinc, 2-4 parts magnesium, 1-2 parts titanium, 0.5-1 parts rare earth elements, and 0.1-0.3 parts boron; wherein the rare earth elements are one or two of cerium and lanthanum mixed in any proportion. The surface anti-corrosion coating formulation consists of 60-70 parts of matrix component and 30-40 parts of functional component. The matrix components, by mass parts, include: 50-55 parts epoxy-organic silicone composite resin, 2-3 parts titanate coupling agent, 25-30 parts mixed solvent, and 8-10 parts nano-alumina; the mixed solvent is a mixture of xylene and acetone in a volume ratio of 1:1, and the nano-alumina has a particle size of 20-50 nm. The functional components, by mass parts, include: 30-35 parts of polyurethane prepolymer, 15-18 parts of graphene-modified zinc powder, 10-12 parts of photothermal responsive microcapsules, 5-6 parts of nano-silica, and 2-3 parts of dimethylethanolamine; the graphene-modified zinc powder is graphene-coated zinc powder with a particle size of 10-20 μm and a coating rate ≥90%; the photothermal responsive microcapsules use bisphenol A epoxy resin and dicyandiamide curing agent as core materials and polydopamine as wall materials, with a particle size of 5-10 μm and a capsule wall thickness of 200-300 nm.

2. A corrosion-resistant outdoor optical cable fitting, characterized in that: The substrate formulation, by mass parts, includes: 70 parts low-carbon steel, 12 parts aluminum, 6 parts zinc, 3 parts magnesium, 1.5 parts titanium, 0.8 parts rare earth elements, and 0.2 parts boron; the rare earth elements are cerium and lanthanum mixed in a mass ratio of 1:

1.

3. A corrosion-resistant outdoor optical cable fitting, characterized in that: The surface anti-corrosion coating formulation, by weight, comprises: 65 parts of matrix component and 35 parts of functional component; the matrix component includes 52 parts of epoxy-organic silicone composite resin, 2.5 parts of titanate coupling agent, 28 parts of mixed solvent, and 7.5 parts of nano-alumina; the functional component includes 32 parts of polyurethane prepolymer, 16 parts of graphene-modified zinc powder, 11 parts of photothermal responsive microcapsules, 5.5 parts of nano-silica, and 2.5 parts of dimethylethanolamine.

4. A method for preparing a corrosion-resistant outdoor optical cable fitting as described in claims 1-3, characterized in that: The preparation method includes five steps: substrate preparation, substrate pretreatment, surface anti-corrosion coating preparation, coating application and curing, and post-treatment, as detailed below: S1, Substrate preparation; S2, Substrate pretreatment; S3. Preparation of surface anti-corrosion coating; S4. Coating application and curing; S5, Post-processing.

5. The method for preparing a corrosion-resistant outdoor optical cable fitting according to claim 4, characterized in that: The substrate preparation is as follows: S101. According to the above-mentioned base material formula, accurately weigh the low carbon steel, aluminum, zinc, magnesium, titanium, rare earth elements and boron components, put the low carbon steel into the medium frequency induction furnace, heat to 1500-1550℃, hold for 30-40 minutes, and let it melt completely. S102. Add aluminum, zinc, magnesium and titanium sequentially to the molten low carbon steel, stir evenly, stir at a speed of 300-400 r / min for 15-20 min, and hold at the temperature for 20-25 min to ensure that the metal components are fully fused. S103. Add rare earth elements and boron to the above molten metal liquid, continue stirring for 10-15 minutes, reduce the stirring speed to 200-250 r / min, and then let it stand for 10-15 minutes to remove the scum on the surface of the molten liquid. S104. Pour the treated molten metal into a prefabricated hardware mold, and shape it using gravity casting process. The casting temperature is controlled at 1400-1450℃. After cooling to room temperature, demold to obtain a rough hardware substrate. S105. Place the rough metal fitting substrate into an annealing furnace for annealing treatment at a temperature of 600-650℃ for 2-3 hours. Then, slowly cool it to room temperature at a rate of 50-80℃ / h to eliminate internal stress in the substrate, refine the grains, and improve the toughness and corrosion resistance of the substrate.

6. The method for preparing a corrosion-resistant outdoor optical cable fitting according to claim 4, characterized in that: The specific pretreatment of the substrate is as follows: S201. Use a grinding machine to grind the rough surface of the hardware substrate to remove the oxide scale, burrs and casting defects on the surface. After grinding, use sandpaper to polish the surface so that the surface roughness Ra of the substrate reaches 30-50μm. S202. The substrate after grinding and polishing is sandblasted. Quartz sand is used as the sandblasting medium. The sandblasting pressure is controlled at 0.3-0.5MPa and the sandblasting time is 5-8min. This makes the substrate surface uniformly rough and enhances the adhesion between the coating and the substrate. S203. Place the sandblasted substrate into a cleaning tank and ultrasonically clean it with anhydrous ethanol for 15-20 minutes at an ultrasonic power of 300-400W to remove dust, oil, and sandblasting residue from the substrate surface. S204. Place the cleaned substrate into a drying oven and dry it at 80-100℃ for 20-30 minutes. After drying, take it out and cool it to room temperature to obtain the pretreated hardware substrate for later use.

7. The method for preparing a corrosion-resistant outdoor optical cable fitting according to claim 4, characterized in that: The surface anti-corrosion coating is prepared as follows: S301. Preparation of matrix components: According to the matrix component formula, epoxy-organic silicone composite resin and titanate coupling agent are added to the mixed solvent and stirred evenly at a stirring speed of 250-300 r / min for 10-15 min. Then, nano-alumina is added sequentially and ultrasonically dispersed for 20-30 min at an ultrasonic power of 400-500 W to ensure uniform dispersion of nano-alumina, thus obtaining the matrix components for later use. S301. Preparation of functional components: According to the functional component formulation, polyurethane prepolymer, graphene-modified zinc powder, and nano-silica are added to deionized water and emulsified by high-speed shearing at a shear rate of 1500-2000 r / min for 20-30 min. Then, photothermal responsive microcapsules and dimethylethanolamine are added and mixed uniformly by low-speed stirring at a stirring rate of 100-150 r / min for 10-15 min. The mixture is then allowed to stand for 5-10 min to defoam, yielding the functional components for later use. S301. Preparation of composite coating: Mix the prepared matrix component and functional component at a mass ratio of 1:0.5-0.7, stir evenly at a stirring speed of 300-350 r / min for 15-20 min, let stand for 5-10 min to remove air bubbles generated during the mixing process, and obtain a surface anti-corrosion composite coating for later use.

8. The method for preparing a corrosion-resistant outdoor optical cable fitting according to claim 4, characterized in that: The coating application and curing process are as follows: S401. Using plasma spraying technology, the surface anti-corrosion composite coating prepared in step 3 is applied to the surface of the pretreated hardware substrate obtained in step 2. The spraying pressure is controlled at 0.4-0.6MPa, the spraying distance is 150-200mm, the spraying temperature is 180-220℃, and the coating thickness is controlled at 250-300μm to ensure that the coating is uniform, free of bubbles and cracks. S401. Place the coated hardware into a curing oven for staged curing: In the first stage, keep it at 50-60℃ for 30-40 minutes to allow the coating to cure initially. In the second stage, the temperature is raised to 120-140℃ and held for 60-90 minutes to allow the coating to fully cure. After curing, the coating is slowly cooled to room temperature at a rate of 60-80℃ / h to prevent cracks from forming due to excessive temperature differences.

9. The method for preparing a corrosion-resistant outdoor optical cable fitting according to claim 4, characterized in that: The post-processing is as follows: S501. Polish the surface of the cured hardware to remove coating defects, drips and burrs, so that the surface of the hardware is smooth and flat and the coating thickness is uniform. S501. Conduct corrosion resistance testing, mechanical strength testing, and coating adhesion testing on the fittings, and reject unqualified products. S501. Clean and dry qualified products, and then use moisture-proof packaging to obtain finished outdoor optical cable hardware with corrosion resistance.

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