Railway canopy steel structure rusty coating anti-corrosion material and preparation method thereof

Abstract

The invention belongs to the field of repairing coatings, and particularly relates to a railway canopy steel structure rusty coating anti-corrosion material and a preparation method thereof. The method comprises the following steps: 1) modifying the surface of metakaolin to obtain functional microspheres; 2) dispersing the functional microspheres in a potassium silicate aqueous solution, uniformly mixing and stirring to obtain paste, and packaging to obtain a component A; (3) adding a modified ion accelerant and carbon nanofibers into the acidic base solution, uniformly stirring to prepare a homogeneous suspension, and packaging to obtain a component B; the component A and the component B are jointly used as the rust coating anti-corrosion material for the steel structure of the railway canopy. The anticorrosive material disclosed by the invention can be used for directly coating a corrosion area of a canopy steel structure with rust, and can be used for carrying out spontaneous deep treatment and conversion on a rust layer and forming a good protective layer, so that the comprehensive performance of the corrosion area is improved. Meanwhile, the anti-corrosion material further has high water repellency and even can be suitable for construction with water, and only short-time waterproof protection is needed after construction is completed.

Description

Technical Field

[0001] This invention belongs to the field of repair coatings, and particularly relates to a corrosion-resistant coating material for rusted steel structures of railway canopies, and a method for preparing the material. Background Technology

[0002] The steel structures of railway platform canopies are exposed to a complex and ever-changing environment for extended periods, facing severe corrosion challenges. According to on-site investigations of high-speed railway station canopies, exposed areas, particularly the roof trusses, beams, platform columns, and external components, are the most severely affected by corrosion. These areas are constantly in semi-exposed or fully exposed environments, enduring the combined erosion of sunlight, rainwater, air pollutants, and salt spray from coastal areas, leading to defects such as powdering, blistering, cracking, and peeling of the surface coating.

[0003] From a material composition perspective, existing canopies primarily use steels such as Q235B, Q345B, and Q690. Their basic components are iron, carbon, manganese, and silicon, along with trace amounts of sulfur and phosphorus. In corrosive environments, the rust layer formed by this composition mainly consists of porous amorphous iron hydroxide, hematite, mixed-valence iron oxides, and more complex mixtures. These compounds exhibit a layered amorphous structure, containing numerous cracks and pores. Their loose structure and high hygroscopicity result in extremely poor protection, failing to effectively prevent the penetration of corrosive media into the substrate, thus exacerbating the corrosion trend. Therefore, once corrosion and rust are discovered in the steel structure of the canopy, immediate repair and protective treatment are necessary.

[0004] However, the existing process for repairing, rebuilding and reinforcing the corroded parts of railway canopy steel structures is relatively complex, usually requiring deep cleaning of the rust layer before applying anti-corrosion coatings.

[0005] However, this construction method has many problems. For example, canopies are usually erected at a high height, especially steel structure canopies, which are often very high and the corroded parts are mostly located at high positions, sometimes tens of meters above the ground. This makes deep rust removal difficult and the operation risky. In addition, the construction window is short. To avoid affecting railway traffic, the construction window is usually only 4 to 6 hours per night, resulting in low construction efficiency and limited effectiveness. Furthermore, because current anti-corrosion coatings generally do not have waterproof and rainproof properties, long-term waterproof and rainproof protection is required after construction to allow the anti-corrosion coating to fully cure and solidify. All these factors result in the limited actual repair and protection effect of existing anti-corrosion coatings, as well as high costs and difficult construction. Summary of the Invention

[0006] To address the challenges of repairing corrosion-damaged steel structures in existing railway canopies, which are difficult and costly, and the low efficiency and stringent requirements of existing anti-corrosion repair materials, this invention provides a rust-resistant coating anti-corrosion material for railway canopy steel structures, as well as a method for preparing the material.

[0007] The main objective of this invention is: 1. Reduce the requirements of the construction environment for anti-corrosion materials. No deep rust removal is required. Only simple surface cleaning and / or light sanding are needed for use. Second, it improves the coating efficiency of anti-corrosion materials and is suitable for rapid construction with short skylight periods; Third, ensure that the parts repaired and reconstructed with anti-corrosion materials have good weather resistance and mechanical properties.

[0008] To achieve the above objectives, the present invention adopts the following technical solution.

[0009] A method for preparing a rust-resistant anti-corrosion coating material for steel structures of railway canopies. The method includes: 1) The metakaolin micro powder was dispersed in an organic solvent to prepare a slurry. A modifier was added to the slurry and a medium-temperature reaction was carried out to modify the surface of the metakaolin. After preparation, the mixture was filtered and dried to obtain functional microspheres. 2) Disperse the functional microspheres in an aqueous solution of potassium silicate, mix and stir evenly to obtain an ointment, and encapsulate it as component A; 3) Prepare an acidic base solution with pH buffering function, add modified ion promoter and carbon nanofiber to the acidic base solution, stir evenly to prepare a homogeneous suspension, and encapsulate it as component B; Components A and B together serve as the anti-corrosion coating material for the rust-resistant steel structure of railway canopies.

[0010] As a preferred option Step 1) The metakaolin powder has a mesh size of 80-300 mesh; The organic solvent mentioned in step 1) is ethanol; Step 1) The modifier is polyethylene glycol thiol and its derivatives and / or cysteamine disulfide, and contains at least cysteamine disulfide.

[0011] As a preferred option Step 1) The surface modification process involves dispersing metakaolin micro powder in an organic solvent to form a slurry, adding 3-6 wt% of the slurry mass of a modifier to the slurry, heating it to 50-60 ℃, and stirring it at a high shear speed of 600-900 rpm for 90-150 min. After filtering and separating the product, it is dried with cold air at 20-30 ℃ to obtain functional microspheres.

[0012] As a preferred option Step 2) The potassium silicate aqueous solution is a potassium silicate aqueous solution with a modulus of 3.0 to 4.0 and a pH value ≥ 10.5; Step 2) The ratio of the amount of functional microspheres to the amount of potassium silicate aqueous solution is (650-800) g: 500 mL.

[0013] As a preferred option Step 2) After the functional microspheres are dispersed in an aqueous solution of potassium silicate, 2-5 wt% of functional additives by weight of the functional microspheres are added. The functional additives are prepared by the following method: Choline chloride and 1-decyl alcohol are mixed in a molar ratio of 1:(2.0-2.2), placed in a dry protective atmosphere, heated to 70-80 °C and stirred for 45-75 min until a homogeneous transparent liquid is formed. The mixture is then cooled to room temperature to obtain the functional additive.

[0014] As a preferred option Step 3) The preparation method of the acidic base solution with pH buffering function is as follows: Gallic acid and phosphoric acid are taken in a molar ratio of 1:(1.9-2.1), dissolved in water to prepare an aqueous solution with a total concentration of 0.27-0.33 mol / L, and then the pH value is adjusted to 2.0-2.5 with 1-3 wt% methylphosphonic acid to obtain an acidic base solution with pH buffering function.

[0015] As a preferred option Step 3) The modified ion promoter is prepared by the following method: Nickel oxide and / or chromium oxide and / or titanium oxide are dispersed in water as a base material. Gellan gum is added at a ratio of 0.06 to 0.10 g / g base material and stirred until evenly dispersed to form a suspension. The stirring speed is maintained at ≥300 rpm while the temperature is raised to 70 ℃. After stirring for 20 to 30 min, the stirring speed is reduced to 120 to 180 rpm and stirring is continued. The mixture is then cooled to room temperature, the particulate matter is filtered out and dried to obtain the modified ion promoter.

[0016] As a preferred option The ratio of the acidic base liquid, the modified ion promoter, and the carbon nanofiber is 1 L: (50-80) g: (60-90) g.

[0017] A rust-resistant coating for the steel structure of a railway canopy.

[0018] As a preferred option When using the rust-resistant anti-corrosion coating on the steel structure of the railway canopy: Take component A and component B according to a mass ratio of 1:(0.25~0.35). First, dissolve component B at a concentration of 750~850 mL / m 2 Apply the appropriate amount of component B to the application area. After 5-10 minutes of waterproof and rainproof protection, apply component A to the surface of component B. After 20-30 minutes of waterproof and rainproof protection, the protection can be removed to allow it to naturally transform and form a protective layer.

[0019] The technical solution of this invention actually involves constructing a multi-stage slow-release and erosion transformation process to achieve the reconstruction and reinforcement of rusted parts of the steel structure of the railway canopy.

[0020] Firstly, this invention is used in combination with an acid-base two-component formulation.

[0021] First, the first coating agent is component B, an acidic agent. Component B can create an acidic corrosive environment at the coating site, which can specifically corrode and erode the rust layer, but cannot effectively corrode uncorroded areas. Under the action of the acidic base liquid with a pH of 2.0 to 2.5, conventional deep rust removal treatment is not required. Because the rusted areas are mainly composed of amorphous iron hydroxide, hematite, mixed valence iron oxides, and more complex mixtures, the acidic buffer solution can fully transform the main components of the rust layer, such as amorphous iron hydroxide, hematite, and mixed valence iron oxides. First, the combination of phosphoric acid and organophosphonic acid (methylphosphonic acid) can effectively erode the unstable rust layer. During this process, the main unstable rust layer component, amorphous iron hydroxide (γ-FeOOH), is captured by the orthophenolic hydroxyl groups in gallic acid to form very stable blue-black chelates such as Fe(C7H5O5)3, which fill the pores of the rust layer. Phosphoric acid forms reinforcing components such as iron phosphate, which can form diffusion protection. The reinforcing layer formed during the transformation of the original rust layer can avoid and block the penetration of corrosive media.

[0022] Therefore, for the technical solution of this invention, not only is deep rust removal unnecessary, but the effective transformation of the target component can be achieved through the formation of the rust layer. Furthermore, significant macroscopic collapse of the rust layer occurs during the two reaction processes described above. For example, the transformation of amorphous iron hydroxyl oxide into iron gallate chelate results in significant volume shrinkage, with a system shrinkage rate exceeding 10% according to data. Hematite, mixed-valence iron oxides, etc., mainly transform into iron phosphate, also exhibit a volume shrinkage rate exceeding 8%. Therefore, there is no need to worry about "densifying" the rust layer during the treatment process, as it will spontaneously collapse during volume shrinkage, directly causing the rust layer at the corroded area to shrink and adhere to the steel substrate, eliminating hollow macroscopic rust layers.

[0023] Furthermore, in this invention, component B also contains a very important modified ion promoter. The core of this invention is the use of nickel and / or chromium and / or titanium oxides as ion promoters to enhance ion diffusion. However, these cannot be directly added to acidic base solutions because direct addition would cause premature dissolution and formation of metal cations. These metal cations are primarily intended to induce the formation of complexes such as FeCr2O4 during rust layer transformation to further strengthen the transformation products and refine the rust layer grains. However, premature dissolution and formation of metal cations would directly lead to doping and diffusion during the early stages of rust layer transformation. For example, nickel ions can alter the morphology of the transformation products during the transformation of iron hydroxide, potentially changing from needle-like products to petal-like structures, further increasing the density of the transformed products. However, this could also cause the premature formation of an excessively strong anti-diffusion dense layer on the rust layer surface, limiting rust layer treatment and halting the transformation of a large amount of inner amorphous iron hydroxide, hematite, and mixed-valence iron oxides. To avoid this, this invention employs a special encapsulation material for the ion promoter. Gellan gel is used. Gellan gel is a relatively special coating material that can coat the surface of ion promoters after swelling in hot water, and it has certain acid and alkali resistance. For example, the Kelcogel F brand gellan gel used in this invention has good acid resistance and can remain stable under pH conditions of 2.0 to 2.5. Therefore, after using gellan gel for non-reactive coating, the acidic base liquid and the ion promoter are separated. Another characteristic of gellan gum is its ability to swell and solidify to form a coating layer, and then swell again or even dissolve in a thermal environment. During the reaction between the acidic base solution and the original rust layer, a large amount of heat is released. In early experiments, this heat of reaction raised the surface temperature of the corroded area to above 75°C and maintained it for several minutes, with peak temperatures even approaching 90°C. Under these conditions, the gellan gum coating layer on the modified ion promoter surface swells and dissolves, releasing metal cations. At this point, the transformation of the original rust layer has reached a certain depth, effectively controlling the release timing of the ion promoter and coordinating the transformation of the original rust layer and the diffusion-doping enhancement process of the rust transformation products. However, if the gellan gum coating layer is too thick, the release will be too slow, resulting in limited diffusion-doping enhancement of the rust transformation products. Conversely, if the gellan gum coating layer is too thin, premature release will occur. Therefore, for the modified ion promoter of the present invention, the specific selection of the ion promoter is not limited to the present invention. Other oxides and / or salts can be selected, as long as the oxides and / or salts can form metal cations under acidic base liquid conditions and the metal cations can coordinate with the rust layer conversion products to achieve strengthening. However, the selection of gelling glue and the control of the coating process will significantly affect the strengthening process and progress.

[0024] Based on the above, component A can be applied after a short reaction time between component B and the original rust layer, without allowing component B to react completely. This is because the reaction rate is high, and secondly, to avoid excessive loss of the acidic base liquid and to ensure effective bonding between the surface protective layer and the substrate, component A needs to be applied immediately for a composite reaction.

[0025] Because component A is an alkaline formulation, its application will neutralize the acidity of component B. However, due to the pH buffering capacity of the acidic base solution, the final pH value of the formulation after coating with component A will generally stabilize within the range of 4 to 5. This pH adjustment is crucial for achieving the formation of the protective layer.

[0026] Firstly, for the functional microspheres of component A, the modification process involves the surface of metakaolin rich in activated silicon-oxygen bonds (Si-O-Si) and aluminum-oxygen bonds (Al-O-Al). Under the specific conditions defined in this invention, these sites will form surface hydroxyl groups, mainly silanols (Si-OH) and aluminumols (Al-OH). Under heating conditions of 50-60°C, the functional groups on the modifier are expected to undergo covalent bonding reactions with the hydroxyl groups on the surface of metakaolin, thereby achieving a covalent bonding reaction. This results in the construction of functional microspheres with metakaolin as the inorganic core, whose surface is grafted with an organic functional layer composed of cysteine ​​disulfide and / or PEG-thiol through covalent bonds (such as Si-N, Al-N, Si-S, etc.). The functional microspheres formed after coating can remain stable and well dispersed in potassium silicate aqueous solution. Although the functional microspheres have the potential for hydrolysis, such as the possible breakage of disulfide bonds, the alkaline-induced binding after the disulfide bonds break allows a small amount of metakaolinite to participate in the reaction to repair the surface of the microspheres, or to react with the potassium silicate aqueous solution to repair it. This gives the functional microspheres effective stability in alkaline potassium silicate aqueous solution.

[0027] However, when components A and B are mixed, the pH value drops drastically. At this point, the coating layer on the surface of the functional microspheres degrades and releases metakaolinite. The interfacial bonds such as Si-OC, Si-N, and Al-OC connecting the modification layer and the core of metakaolinite undergo acid-catalyzed hydrolysis under acidic conditions, leading to the release of metakaolinite. At the same time, potassium silicate itself undergoes hydrolysis and dehydration condensation under acidic conditions to form colloidal silicic acid. The Al ions in the metakaolinite will dissolve rapidly and undergo coordination polymerization with the colloidal silicic acid to form products such as amorphous aluminosilicate gels. This causes the base liquid in the original component A to react violently with the release of the microspheres and polymerize, forming a solid protective layer with high strength after drying.

[0028] During the formation of the solidified protective layer, the existing corrosion zone can be further filled and covered before the gel dries and solidifies. This process fully fills and effectively covers the micropores, forming a low-permeability physical isolation layer similar to concrete. This effectively blocks the penetration and diffusion of water, oxygen, chlorine, and acidic gases, significantly enhancing chemical resistance and inhibiting ion migration, thus significantly improving the chemical / electrochemical stability of the steel structure surface. Simultaneously, the solidified protective layer exhibits excellent mechanical properties and fire and heat resistance, achieving comprehensive optimization of the steel structure in the corrosion zone. However, this solidified protective layer also has some drawbacks, such as its high crack sensitivity. Therefore, after the functional microsphere surface modification layer of this invention detaches, further surface film formation can be performed. Disulfide bonds possess dynamic repair capabilities, capable of repairing microcracks, while the carbon nanofibers in component B can also assist in enhancing the toughness of the solidified layer. Furthermore, the protective layer exhibits high humidity sensitivity during the gelation and solidification process. High humidity environments, such as rain, can easily cause the gel to absorb water, swell, and detach. Therefore, this invention further incorporates functional additives. These functional additives are amphiphilic and can float to the surface after component A and component B are mixed. During the solidification process, they can first form a hydrophobic film (hydrophilic end facing inward and hydrophobic end facing outward), thereby enabling the anti-corrosion coating of this invention to provide only short-term waterproof protection after application.

[0029] The beneficial effects of this invention are: This invention's anti-corrosion material can be directly applied to corroded areas of steel structures in canopies, even with rust present. It can spontaneously and deeply treat and transform the rust layer, forming a good protective layer and improving the overall performance of the corroded area. Simultaneously, the anti-corrosion material also has strong water-repellent capabilities, making it suitable even for construction in wet conditions; only short-term waterproofing protection is required after application. Detailed Implementation

[0030] The present invention will be further described clearly and in detail below with reference to specific embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only some, not all, of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0031] Unless otherwise specified, all raw materials used in the embodiments of the present invention are commercially available or obtainable by those skilled in the art; unless otherwise specified, all methods used in the embodiments of the present invention are methods mastered by those skilled in the art.

[0032] Example 1: A rust-resistant anti-corrosion coating material for railway canopy steel structures, the preparation method of which is as follows: 1) 250 mesh metakaolin powder was dispersed in ethanol to prepare a slurry. Polyethylene glycol thiol and cysteine ​​disulfide were added to the slurry in a mass ratio of 2:3 as modifiers. The amount of modifiers was 5 wt% of the slurry mass. The surface of the metakaolin was then modified by heating to 55 ℃ and stirring at 750 rpm for 120 min. After filtration, the surface was dried by blowing with cold air at 20 ℃ to obtain functional microspheres. 2) Disperse the functional microspheres in an aqueous solution of potassium silicate with a modulus of 3.5 and a pH of 10.5. The ratio of the functional microspheres to the aqueous solution of potassium silicate is 700 g: 500 mL. Then add 3.5 wt% of functional additives by weight of the functional microspheres and mix and stir evenly to obtain an ointment, which is then packaged as component A. The functional additive is prepared by the following method: choline chloride and 1-decyl alcohol are mixed in a molar ratio of 1:2.0 and placed in a dry protective atmosphere. The mixture is heated to 75 °C and stirred for 60 min until a homogeneous transparent liquid is formed. Then it is cooled to room temperature to obtain the functional additive. 3) Gallic acid and phosphoric acid were taken in a molar ratio of 1:2 and dissolved in water to prepare an aqueous solution with a total concentration of 0.30 mol / L. The pH value was then adjusted to 2.2 with 1 wt% methylphosphonic acid to prepare an acidic base solution. Modified ion promoter and carbon nanofibers were added to the acidic base solution. The ratio of acidic base solution, modified ion promoter and carbon nanofibers was 1 L: 65 g: 75 g. The solution was stirred evenly to prepare a homogeneous suspension and packaged as component B. The modified ion promoter is prepared by the following method: Nickel oxide and chromium oxide (mass ratio 1:3) were used as base materials and dispersed in water at a ratio of 1 g: 10 mL. Gellan gum was added at a ratio of 0.08 g / g base material and stirred to form a suspension. The stirring speed was maintained at ≥300 rpm while the temperature was raised to 70 ℃. After stirring for 25 min, the stirring speed was reduced to 150 rpm and stirring was continued. The mixture was then cooled to room temperature. The particulate matter was filtered out and dried to obtain the modified ion promoter. Components A and B together serve as the anti-corrosion coating material for the rust-resistant steel structure of railway canopies.

[0033] The performance of the anti-corrosion coating material for the rusted steel structure of the railway canopy prepared in this example was tested. Q235B steel was used as a fresh sample for artificial rapid aging corrosion. Under the condition of 35 ℃±1 ℃, it was continuously sprayed with 5 wt% sodium chloride aqueous solution for 15 min per hour and stopped for 45 min. After 500 h of artificial rapid aging corrosion, it was used as a corrosion sample.

[0034] After corrosion, the yield strength of the sample decreased to approximately 163–185 MPa, and the tensile strength decreased to approximately 306–342 MPa.

[0035] Subsequently, the corrosion test sample was coated with the anti-corrosion material for the rust-covered steel structure of the railway canopy prepared in this example.

[0036] When using the rust-resistant anti-corrosion coating on the steel structure of the railway canopy: Take component A and component B according to a mass ratio of 1:0.30. First, mix component B at a dosage of 800 mL / m 2 The amount of component B is applied to the construction area. After 8 minutes of waterproof and rainproof protection, component A is applied to the surface of the area where component B is applied. After 25 minutes of waterproof and rainproof protection, it is allowed to solidify naturally to form a protective layer. After waterproof and rainproof protection, deionized water is continuously sprayed by atomization for 2 hours to simulate a rain environment as an experimental sample.

[0037] After standing for 6 hours to fully solidify and form a protective layer, the chemical resistance (protective layer) and mechanical properties of the experimental samples were characterized. Fresh samples underwent the same chemical resistance characterization and served as a control. The characterization results are shown below.

[0038]

[0039] In the table: NSS is a neutral salt spray aging test, and the test solution is a 50 g / L sodium chloride aqueous solution; ASS is an acidic salt spray corrosion test, and the test solution is a 12.5 g / L sodium bisulfate aqueous solution; BSS is an alkaline salt spray corrosion test, and the test solution is a 3.5 wt% sodium chloride aqueous solution with the pH adjusted to 10 by potassium silicate. The NSS, ASS and BSS corrosion tests were all conducted by continuous spraying of the test solution, with spraying for 15 min per hour and stopping for 45 min, for 7 days and the average value was recorded.

[0040] The characterization results clearly demonstrate that the anti-corrosion material exhibits excellent rust-resistant repair performance. While the mechanical properties of the aged corroded sample showed a significant decrease compared to the fresh sample, after repair, the yield strength of the sample recovered to over 95% of the original fresh sample, and the tensile strength was slightly higher than that of the fresh sample. This indicates that the consolidated layer possesses excellent mechanical properties, and component B effectively treats the original rust layer, significantly improving the mechanical properties of the sample. Furthermore, the corrosion test results show that the protective layer exhibits excellent chemical resistance. In terms of its resistance to non-chlorinated chloride (NSS), the corrosion rate decreased to less than 10% of that of the original fresh Q235B steel, while the ASS corrosion rate decreased by approximately 97%. For BSS corrosion conditions, due to the relatively excellent alkali corrosion resistance inherent in Q235 steel, the improvement was relatively limited, but still showed a noticeable improvement.

[0041] Example 2: A rust-resistant anti-corrosion coating material for railway canopy steel structures, the preparation method of which is as follows: 1) 250 mesh metakaolin powder was dispersed in ethanol to prepare a slurry. Polyethylene glycol thiol and cysteine ​​disulfide were added to the slurry in a mass ratio of 2:3 as modifiers. The amount of modifiers was 5 wt% of the slurry mass. The surface of the metakaolin was then modified by heating to 55 ℃ and stirring at 750 rpm for 120 min. After filtration, the surface was dried by blowing with cold air at 20 ℃ to obtain functional microspheres. 2) Disperse the functional microspheres in an aqueous solution of potassium silicate with a modulus of 3.5 and a pH of 10.5. The ratio of the functional microspheres to the aqueous solution of potassium silicate is 700 g: 500 mL. Then add 3.5 wt% of functional additives by weight of the functional microspheres and mix and stir evenly to obtain an ointment, which is then packaged as component A. The functional additive is prepared by the following method: choline chloride and 1-decyl alcohol are mixed in a molar ratio of 1:2.0 and placed in a dry protective atmosphere. The mixture is heated to 75 °C and stirred for 60 min until a homogeneous transparent liquid is formed. Then it is cooled to room temperature to obtain the functional additive. 3) Gallic acid and phosphoric acid were taken in a molar ratio of 1:2 and dissolved in water to prepare an aqueous solution with a total concentration of 0.30 mol / L. The pH value was then adjusted to 2.2 with 1 wt% methylphosphonic acid to prepare an acidic base solution. Modified ion promoter and carbon nanofibers were added to the acidic base solution. The ratio of acidic base solution, modified ion promoter and carbon nanofibers was 1 L: 65 g: 75 g. The solution was stirred evenly to prepare a homogeneous suspension and packaged as component B. The modified ion promoter is prepared by the following method: Chromium oxide was used as a base material and dispersed in water at a ratio of 1 g: 10 mL. Gellan gum was added at a ratio of 0.08 g / g base material and stirred to form a suspension. The stirring speed was maintained at ≥300 rpm while the temperature was raised to 70 ℃. After stirring for 25 min, the stirring speed was reduced to 150 rpm and stirring was continued. The mixture was then cooled to room temperature. The particulate matter was filtered out and dried to obtain the modified ion promoter. Components A and B together serve as the anti-corrosion coating material for the rust-resistant steel structure of railway canopies.

[0042] The performance of the anti-corrosion coating material for the rusted steel structure of the railway canopy prepared in this example was tested. Q235B steel was used as a fresh sample for artificial rapid aging corrosion. Under the condition of 35 ℃±1 ℃, it was continuously sprayed with 5 wt% sodium chloride aqueous solution for 15 min per hour and stopped for 45 min. After 500 h of artificial rapid aging corrosion, it was used as a corrosion sample.

[0043] Subsequently, the corrosion test sample was coated with the anti-corrosion material for the rust-covered steel structure of the railway canopy prepared in this example.

[0044] When using the rust-resistant anti-corrosion coating on the steel structure of the railway canopy: Take component A and component B according to a mass ratio of 1:0.30. First, mix component B at a dosage of 800 mL / m 2 The amount of component B is applied to the construction area. After 8 minutes of waterproof and rainproof protection, component A is applied to the surface of the area where component B is applied. After 25 minutes of waterproof and rainproof protection, it is allowed to solidify naturally to form a protective layer. After waterproof and rainproof protection, deionized water is continuously sprayed by atomization for 2 hours to simulate a rain environment as an experimental sample.

[0045] After standing for 6 hours to fully solidify and form a protective layer, the chemical resistance (protective layer) and mechanical properties of the experimental samples were characterized. Fresh samples underwent the same chemical resistance characterization and served as a control. The characterization results are shown below.

[0046]

[0047] In the table: NSS is a neutral salt spray aging test, and the test solution is a 50 g / L sodium chloride aqueous solution; ASS is an acidic salt spray corrosion test, and the test solution is a 12.5 g / L sodium bisulfate aqueous solution; BSS is an alkaline salt spray corrosion test, and the test solution is a 3.5 wt% sodium chloride aqueous solution with the pH adjusted to 10 by potassium silicate. The NSS, ASS and BSS corrosion tests were all conducted by continuous spraying of the test solution, with spraying for 15 min per hour and stopping for 45 min, for 7 days and the average value was recorded.

[0048] Example 3: A rust-resistant anti-corrosion coating material for railway canopy steel structures, the preparation method of which is as follows: 1) 250 mesh metakaolin powder was dispersed in ethanol to prepare a slurry. Polyethylene glycol thiol and cysteine ​​disulfide were added to the slurry in a mass ratio of 2:3 as modifiers. The amount of modifiers was 5 wt% of the slurry mass. The surface of the metakaolin was then modified by heating to 55 ℃ and stirring at 750 rpm for 120 min. After filtration, the surface was dried by blowing with cold air at 20 ℃ to obtain functional microspheres. 2) Disperse the functional microspheres in an aqueous solution of potassium silicate with a modulus of 3.5 and a pH of 10.5. The ratio of the functional microspheres to the aqueous solution of potassium silicate is 700 g: 500 mL. Then add 3.5 wt% of functional additives by weight of the functional microspheres and mix and stir evenly to obtain an ointment, which is then packaged as component A. The functional additive is prepared by the following method: choline chloride and 1-decyl alcohol are mixed in a molar ratio of 1:2.0 and placed in a dry protective atmosphere. The mixture is heated to 75 °C and stirred for 60 min until a homogeneous transparent liquid is formed. Then it is cooled to room temperature to obtain the functional additive. 3) Gallic acid and phosphoric acid were taken in a molar ratio of 1:2 and dissolved in water to prepare an aqueous solution with a total concentration of 0.30 mol / L. The pH value was then adjusted to 2.2 with 1 wt% methylphosphonic acid to prepare an acidic base solution. Modified ion promoter and carbon nanofibers were added to the acidic base solution. The ratio of acidic base solution, modified ion promoter and carbon nanofibers was 1 L: 65 g: 75 g. The solution was stirred evenly to prepare a homogeneous suspension and packaged as component B. The modified ion promoter is prepared by the following method: Chromium oxide and titanium oxide (9:1) were used as base materials and dispersed in water at a ratio of 1 g:10 mL. Gellan gum was added at a ratio of 0.08 g / g base material and stirred to form a suspension. The stirring speed was maintained at ≥300 rpm while the temperature was raised to 70 ℃. After stirring for 25 min, the stirring speed was reduced to 150 rpm and stirring was continued. The mixture was then cooled to room temperature. The particulate matter was filtered out and dried to obtain the modified ion promoter. Components A and B together serve as the anti-corrosion coating material for the rust-resistant steel structure of railway canopies.

[0049] The performance of the anti-corrosion coating material for the rusted steel structure of the railway canopy prepared in this example was tested. Q235B steel was used as a fresh sample for artificial rapid aging corrosion. Under the condition of 35 ℃±1 ℃, it was continuously sprayed with 5 wt% sodium chloride aqueous solution for 15 min per hour and stopped for 45 min. After 500 h of artificial rapid aging corrosion, it was used as a corrosion sample.

[0050] Subsequently, the corrosion test sample was coated with the anti-corrosion material for the rust-covered steel structure of the railway canopy prepared in this example.

[0051] When using the rust-resistant anti-corrosion coating on the steel structure of the railway canopy: Take component A and component B according to a mass ratio of 1:0.30. First, mix component B at a dosage of 800 mL / m 2The amount of component B is applied to the construction area. After 8 minutes of waterproof and rainproof protection, component A is applied to the surface of the area where component B is applied. After 25 minutes of waterproof and rainproof protection, it is allowed to solidify naturally to form a protective layer. After waterproof and rainproof protection, deionized water is continuously sprayed by atomization for 2 hours to simulate a rain environment as an experimental sample.

[0052] After standing for 6 hours to fully solidify and form a protective layer, the chemical resistance (protective layer) and mechanical properties of the experimental samples were characterized. Fresh samples underwent the same chemical resistance characterization and served as a control. The characterization results are shown below.

[0053]

[0054] In the table: NSS is a neutral salt spray aging test, and the test solution is a 50 g / L sodium chloride aqueous solution; ASS is an acidic salt spray corrosion test, and the test solution is a 12.5 g / L sodium bisulfate aqueous solution; BSS is an alkaline salt spray corrosion test, and the test solution is a 3.5 wt% sodium chloride aqueous solution with the pH adjusted to 10 by potassium silicate. The NSS, ASS and BSS corrosion tests were all conducted by continuous spraying of the test solution, with spraying for 15 min per hour and stopping for 45 min, for 7 days and the average value was recorded.

[0055] The characterization results clearly show that the main difference between Examples 1-3 lies in the adjustment of the core oxide in the modified ion accelerator. This adjustment significantly affects the mechanical properties and chemical resistance of the material, primarily in its impact on yield strength and tensile strength. This indicates that the metal cations in the modified ion accelerator mainly influence the repair process of rusted areas, while having a relatively small impact on the solidified protective layer, meaning its surface chemical resistance is relatively minor.

[0056] Comparative Example 1: A rust-resistant anti-corrosion coating material for a railway canopy steel structure, the preparation method of which is as follows: 1) 250 mesh metakaolin powder was dispersed in ethanol to prepare a slurry. Polyethylene glycol thiol and cysteine ​​disulfide were added to the slurry in a mass ratio of 2:3 as modifiers. The amount of modifiers was 5 wt% of the slurry mass. The surface of the metakaolin was then modified by heating to 55 ℃ and stirring at 750 rpm for 120 min. After filtration, the surface was dried by blowing with cold air at 20 ℃ to obtain functional microspheres. 2) Disperse the functional microspheres in an aqueous solution of potassium silicate with a modulus of 3.5 and a pH of 10.5. The ratio of the functional microspheres to the aqueous solution of potassium silicate is 700 g: 500 mL. Mix and stir evenly to obtain an ointment, which is then packaged as component A. 3) Gallic acid and phosphoric acid were taken in a molar ratio of 1:2 and dissolved in water to prepare an aqueous solution with a total concentration of 0.30 mol / L. The pH value was then adjusted to 2.2 with 1 wt% methylphosphonic acid to prepare an acidic base solution. Modified ion promoter and carbon nanofibers were added to the acidic base solution. The ratio of acidic base solution, modified ion promoter and carbon nanofibers was 1 L: 65 g: 75 g. The solution was stirred evenly to prepare a homogeneous suspension and packaged as component B. The modified ion promoter is prepared by the following method: Nickel oxide and chromium oxide (mass ratio 1:3) were used as base materials and dispersed in water at a ratio of 1 g: 10 mL. Gellan gum was added at a ratio of 0.08 g / g base material and stirred to form a suspension. The stirring speed was maintained at ≥300 rpm while the temperature was raised to 70 ℃. After stirring for 25 min, the stirring speed was reduced to 150 rpm and stirring was continued. The mixture was then cooled to room temperature. The particulate matter was filtered out and dried to obtain the modified ion promoter. Components A and B together serve as the anti-corrosion coating material for the rust-resistant steel structure of railway canopies.

[0057] The performance of the anti-corrosion coating material for the rusted steel structure of the railway canopy prepared in this example was tested. Q235B steel was used as a fresh sample for artificial rapid aging corrosion. Under the condition of 35 ℃±1 ℃, it was continuously sprayed with 5 wt% sodium chloride aqueous solution for 15 min per hour and stopped for 45 min. After 500 h of artificial rapid aging corrosion, it was used as a corrosion sample.

[0058] After corrosion, the yield strength of the sample decreased to approximately 163–185 MPa, and the tensile strength decreased to approximately 306–342 MPa.

[0059] Subsequently, the corrosion test sample was coated with the anti-corrosion material for the rust-covered steel structure of the railway canopy prepared in this example.

[0060] When using the rust-resistant anti-corrosion coating on the steel structure of the railway canopy: Take component A and component B according to a mass ratio of 1:0.30. First, mix component B at a dosage of 800 mL / m 2 The amount of component B is applied to the construction area. After 8 minutes of waterproof and rainproof protection, component A is applied to the surface of the area where component B is applied. After 25 minutes of waterproof and rainproof protection, it is allowed to solidify naturally to form a protective layer. After waterproof and rainproof protection, deionized water is continuously sprayed by atomization for 2 hours to simulate a rain environment as an experimental sample.

[0061] After standing for 6 hours to fully solidify and form a protective layer, the experimental sample was characterized and compared in the same way as in Example 1 (compared to Example 1). In this example, the cracking phenomenon of the solidified protective layer on the surface was also observed and compared with Example 1. The characterization results are shown below.

[0062]

[0063] The characterization results above show that this example only reduced the amount of functional additives in component A. After reducing the use of functional additives, significant swelling and detachment occurred during the consolidation process. This was mainly manifested in the swelling of the semi-cured gel layer during continuous atomized spraying of deionized water for 2 hours in a simulated rain environment. After curing, noticeable cracks and bulges appeared, leading to a severe deterioration in chemical resistance. This demonstrates that functional additives significantly optimize the application conditions of the anti-corrosion coating of this invention. The functional additive used in this invention is actually a special amphiphilic alkali-resistant HDES, which can remain stable in potassium silicate aqueous solution and also helps protect the functional microspheres and promote their dispersion. During the consolidation process, due to its amphiphilic properties, it can quickly float to the coating surface, achieving the curing of the hydrophobic protective coating during the consolidation process.

[0064] Comparative Example 2: A rust-resistant anti-corrosion coating material for a railway canopy steel structure, the preparation method of which is as follows: 1) 250 mesh metakaolin powder was dispersed in ethanol to prepare a slurry. Polyethylene glycol thiol and cysteine ​​disulfide were added to the slurry in a mass ratio of 2:3 as modifiers. The amount of modifiers was 5 wt% of the slurry mass. The surface of the metakaolin was then modified by heating to 55 ℃ and stirring at 750 rpm for 120 min. After filtration, the surface was dried by blowing with cold air at 20 ℃ to obtain functional microspheres. 2) Disperse the functional microspheres in an aqueous solution of potassium silicate with a modulus of 3.5 and a pH of 10.5. The ratio of the functional microspheres to the aqueous solution of potassium silicate is 700 g: 500 mL. Then add 3.5 wt% of functional additives by weight of the functional microspheres and mix and stir evenly to obtain an ointment, which is then packaged as component A. The functional additive is prepared by the following method: choline chloride and 1-decyl alcohol are mixed in a molar ratio of 1:2.0 and placed in a dry protective atmosphere. The mixture is heated to 75 °C and stirred for 60 min until a homogeneous transparent liquid is formed. Then it is cooled to room temperature to obtain the functional additive. 3) Gallic acid and phosphoric acid were taken in a molar ratio of 1:2 and dissolved in water to prepare an aqueous solution with a total concentration of 0.30 mol / L. The pH value was then adjusted to 2.2 with 1 wt% methylphosphonic acid to prepare an acidic base solution. An ion promoter and carbon nanofibers were added to the acidic base solution. The ratio of acidic base solution, ion promoter and carbon nanofibers was 1 L: 65 g: 75 g. The solution was stirred evenly to prepare a homogeneous suspension and packaged as component B. The ion promoter is nickel oxide and chromium oxide (mass ratio 1:3). Components A and B together serve as the anti-corrosion coating material for the rust-resistant steel structure of railway canopies.

[0065] The performance of the anti-corrosion coating material for the rusted steel structure of the railway canopy prepared in this example was tested. Q235B steel was used as a fresh sample for artificial rapid aging corrosion. Under the condition of 35 ℃±1 ℃, it was continuously sprayed with 5 wt% sodium chloride aqueous solution for 15 min per hour and stopped for 45 min. After 500 h of artificial rapid aging corrosion, it was used as a corrosion sample.

[0066] After corrosion, the yield strength of the sample decreased to approximately 163–185 MPa, and the tensile strength decreased to approximately 306–342 MPa.

[0067] Subsequently, the corrosion test sample was coated with the anti-corrosion material for the rust-covered steel structure of the railway canopy prepared in this example.

[0068] When using the rust-resistant anti-corrosion coating on the steel structure of the railway canopy: Take component A and component B according to a mass ratio of 1:0.30. First, mix component B at a dosage of 800 mL / m 2 The amount of component B is applied to the construction area. After 8 minutes of waterproof and rainproof protection, component A is applied to the surface of the area where component B is applied. After 25 minutes of waterproof and rainproof protection, it is allowed to solidify naturally to form a protective layer. After waterproof and rainproof protection, deionized water is continuously sprayed by atomization for 2 hours to simulate a rain environment as an experimental sample.

[0069] After standing for 6 hours to fully solidify and form a protective layer, the experimental sample was characterized and compared in the same way as in Example 1 (compared to Example 1). This example also characterized the bonding strength between the formed protective layer and the substrate and compared it with Example 1. The characterization results are shown below.

[0070]

[0071] As can be seen from the above characterization results, this example uses an equivalent oxide as an ion promoter to replace the modified ion promoter in Example 1. This allows the metal cations in the ion promoter to dissolve directly into component B. As a result, during the action of component B, the process of deep treatment of the rust layer is hindered, the treatment depth will be significantly reduced, and some deep rust layers will not be effectively treated, resulting in poor bonding between the coating and the substrate. Because it is bonded to the rust layer, the bonding strength is poor, and the mechanical property repair effect is also significantly reduced, showing obvious deficiencies in yield strength and tensile strength.

[0072] Therefore, deep treatment requires the synergistic cooperation of two processes: rust removal and diffusion strengthening. Diffusion strengthening relies on the material transformation inherent in the deep rust removal process, but it can also hinder this process. Therefore, appropriate additives are needed to coat the ion promoter, allowing it to be released under suitable conditions, thus achieving synergy between the two processes. Currently, only gellan gum can meet these specific release conditions. Gellan gum can easily coat the ion promoter while maintaining its effective stability in component B with almost no impact on its function. After component B is applied, the temperature rise during the deep rust removal chemical reaction process releases the ion promoter.

[0073] Comparative Example 3: A rust-resistant anti-corrosion coating material for a railway canopy steel structure, the preparation method of which is as follows: 1) 250 mesh metakaolin powder was dispersed in a saturated calcium hydroxide aqueous solution to prepare a slurry. The slurry was then heated to 35 °C and stirred for 120 min to allow calcium hydroxide to precipitate and deposit on the surface of the metakaolin using metakaolin as a nucleation center. After filtration, the slurry was transferred to 1 mol / L sodium bicarbonate and stirred for 15 min to convert the surface coating into calcium carbonate. The slurry was then filtered and dried by blowing with cold air at 20 °C to obtain functional microspheres. 2) Disperse the functional microspheres in an aqueous solution of potassium silicate with a modulus of 3.5 and a pH of 10.5. The ratio of the functional microspheres to the aqueous solution of potassium silicate is 700 g: 500 mL. Then add 3.5 wt% of functional additives by weight of the functional microspheres and mix and stir evenly to obtain an ointment, which is then packaged as component A. The functional additive is prepared by the following method: choline chloride and 1-decyl alcohol are mixed in a molar ratio of 1:2.0 and placed in a dry protective atmosphere. The mixture is heated to 75 °C and stirred for 60 min until a homogeneous transparent liquid is formed. Then it is cooled to room temperature to obtain the functional additive. 3) Gallic acid and phosphoric acid were taken in a molar ratio of 1:2 and dissolved in water to prepare an aqueous solution with a total concentration of 0.30 mol / L. The pH value was then adjusted to 2.2 with 1 wt% methylphosphonic acid to prepare an acidic base solution. Modified ion promoter and carbon nanofibers were added to the acidic base solution. The ratio of acidic base solution, modified ion promoter and carbon nanofibers was 1 L: 65 g: 75 g. The solution was stirred evenly to prepare a homogeneous suspension and packaged as component B. The modified ion promoter is prepared by the following method: Nickel oxide and chromium oxide (mass ratio 1:3) were used as base materials and dispersed in water at a ratio of 1 g: 10 mL. Gellan gum was added at a ratio of 0.08 g / g base material and stirred to form a suspension. The stirring speed was maintained at ≥300 rpm while the temperature was raised to 70 ℃. After stirring for 25 min, the stirring speed was reduced to 150 rpm and stirring was continued. The mixture was then cooled to room temperature. The particulate matter was filtered out and dried to obtain the modified ion promoter. Components A and B together serve as the anti-corrosion coating material for the rust-resistant steel structure of railway canopies.

[0074] The performance of the anti-corrosion coating material for the rusted steel structure of the railway canopy prepared in this example was tested. Q235B steel was used as a fresh sample for artificial rapid aging corrosion. Under the condition of 35 ℃±1 ℃, it was continuously sprayed with 5 wt% sodium chloride aqueous solution for 15 min per hour and stopped for 45 min. After 500 h of artificial rapid aging corrosion, it was used as a corrosion sample.

[0075] After corrosion, the yield strength of the sample decreased to approximately 163–185 MPa, and the tensile strength decreased to approximately 306–342 MPa.

[0076] Subsequently, the corrosion test sample was coated with the anti-corrosion material for the rust-covered steel structure of the railway canopy prepared in this example.

[0077] When using the rust-resistant anti-corrosion coating on the steel structure of the railway canopy: Take component A and component B according to a mass ratio of 1:0.30. First, mix component B at a dosage of 800 mL / m 2 The amount of component B is applied to the construction area. After 8 minutes of waterproof and rainproof protection, component A is applied to the surface of the area where component B is applied. After 25 minutes of waterproof and rainproof protection, it is allowed to solidify naturally to form a protective layer. After waterproof and rainproof protection, deionized water is continuously sprayed by atomization for 2 hours to simulate a rain environment as an experimental sample.

[0078] After standing for 6 hours to fully solidify and form a protective layer, the experimental sample was characterized and compared in the same way as in Example 1 (compared to Example 1). In this example, the cracking phenomenon of the solidified protective layer on the surface was also observed and compared with Example 1. The characterization results are shown below.

[0079]

[0080] The characterization results above show that the functional microspheres in this example are coated with inorganic materials. It should be noted that during step 1), due to the high reactivity of metakaolin, a certain degree of hydration occurred. Although functional microspheres were ultimately formed, some hydration loss was actually incurred, such as a significant increase in the viscosity of the solution system during filtration. Regarding the final preparation results, the mechanical properties of the product in this example also decreased, which may be related to the hydration effect during the preparation of functional microspheres. Most importantly, however, cracking occurred, and the chemical resistance also showed a significant decrease, similar to Comparative Example 1. It can be seen that the protective layer is key to achieving chemical resistance; even small cracks can lead to a decrease in resistance to ion penetration, resulting in reduced chemical resistance. Although component B can improve chemical resistance to some extent after deep repair of the rust layer, ultimately, an effective Si-O-Al consolidation protective layer mainly composed of component A is still required. The special modifier used in this invention, with its disulfide bonds, enables the consolidation layer to have a certain crack repair capability during film formation and consolidation, significantly improving the surface morphology and inducing the formation of a denser surface, thus significantly improving chemical resistance.

Claims

1. A method for preparing a rust-resistant anti-corrosion coating material for a railway canopy steel structure, characterized in that, The method includes: 1) The metakaolin micro powder was dispersed in an organic solvent to prepare a slurry. A modifier was added to the slurry and a medium-temperature reaction was carried out to modify the surface of the metakaolin. After preparation, the mixture was filtered and dried to obtain functional microspheres. 2) Disperse the functional microspheres in an aqueous solution of potassium silicate, mix and stir evenly to obtain an ointment, and encapsulate it as component A; 3) Prepare an acidic base solution with pH buffering function, add modified ion promoter and carbon nanofiber to the acidic base solution, stir evenly to prepare a homogeneous suspension, and encapsulate it as component B; Components A and B together serve as the anti-corrosion coating material for the rust-resistant steel structure of railway canopies.

2. The method for preparing a rust-resistant anti-corrosion coating material for a railway canopy steel structure according to claim 1, characterized in that, Step 1) The metakaolin powder has a mesh size of 80-300 mesh; The organic solvent mentioned in step 1) is ethanol; Step 1) The modifier is polyethylene glycol thiol and its derivatives and / or cysteamine disulfide, and contains at least cysteamine disulfide.

3. The method for preparing a rust-resistant anti-corrosion coating material for a railway canopy steel structure according to claim 1 or 2, characterized in that, Step 1) The surface modification process involves dispersing metakaolin micro powder in an organic solvent to form a slurry, adding 3-6 wt% of the slurry mass of a modifier to the slurry, heating it to 50-60 ℃, and stirring it at a high shear speed of 600-900 rpm for 90-150 min. After filtering and separating the product, it is dried with cold air at 20-30 ℃ to obtain functional microspheres.

4. The method for preparing a rust-resistant anti-corrosion coating material for a railway canopy steel structure according to claim 1, characterized in that, Step 2) The potassium silicate aqueous solution is a potassium silicate aqueous solution with a modulus of 3.0 to 4.0 and a pH value ≥ 10.5; Step 2) The ratio of the amount of functional microspheres to the amount of potassium silicate aqueous solution is (650-800) g: 500 mL.

5. A method for preparing a rust-resistant anti-corrosion coating material for a railway canopy steel structure according to claim 1 or 4, characterized in that, Step 2) After the functional microspheres are dispersed in an aqueous solution of potassium silicate, 2-5 wt% of functional additives by weight of the functional microspheres are added. The functional additives are prepared by the following method: Choline chloride and 1-decyl alcohol are mixed in a molar ratio of 1:(2.0-2.2), placed in a dry protective atmosphere, heated to 70-80 °C and stirred for 45-75 min until a homogeneous transparent liquid is formed. The mixture is then cooled to room temperature to obtain the functional additive.

6. The method for preparing a rust-resistant anti-corrosion coating material for a railway canopy steel structure according to claim 1, characterized in that, Step 3) The preparation method of the acidic base solution with pH buffering function is as follows: Gallic acid and phosphoric acid are taken in a molar ratio of 1:(1.9-2.1), dissolved in water to prepare an aqueous solution with a total concentration of 0.27-0.33 mol / L, and then the pH value is adjusted to 2.0-2.5 with 1-3 wt% methylphosphonic acid to obtain an acidic base solution with pH buffering function.

7. The method for preparing a rust-resistant anti-corrosion coating material for a railway canopy steel structure according to claim 1, characterized in that, Step 3) The modified ion promoter is prepared by the following method: Nickel oxide and / or chromium oxide and / or titanium oxide are dispersed in water as a base material. Gellan gum is added at a ratio of 0.06 to 0.10 g / g base material and stirred until evenly dispersed to form a suspension. The stirring speed is maintained at ≥300 rpm while the temperature is raised to 70 ℃. After stirring for 20 to 30 min, the stirring speed is reduced to 120 to 180 rpm and stirring is continued. The mixture is then cooled to room temperature, the particulate matter is filtered out and dried to obtain the modified ion promoter.

8. A method for preparing a rust-resistant anti-corrosion coating material for a railway canopy steel structure according to claim 1, 6, or 7, characterized in that, The ratio of the acidic base liquid, the modified ion promoter, and the carbon nanofiber is 1 L: (50-80) g: (60-90) g.

9. A rust-resistant coating anti-corrosion material for railway canopy steel structures prepared by any one of claims 1 to 8.

10. A rust-resistant anti-corrosion coating material for railway canopy steel structures according to claim 9, characterized in that, When using the rust-resistant anti-corrosion coating on the steel structure of the railway canopy: Take component A and component B according to a mass ratio of 1:(0.25~0.35). First, dissolve component B at a concentration of 750~850mL / m 2 Apply the appropriate amount of component B to the application area. After 5-10 minutes of waterproof and rainproof protection, apply component A to the surface of component B. After 20-30 minutes of waterproof and rainproof protection, allow it to naturally transform and form a protective layer.

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