Inorganic corrosion and fireproof integrated coating material for power grid steel structure and preparation and application thereof

Abstract

The application discloses an inorganic corrosion and fire prevention integrated coating material for a power grid steel structure and a preparation and application thereof. The material components are as follows in terms of weight: 100 parts of lithium silicate solution; 40-60 parts of composite corrosion-resistant filler; 15-20 parts of pure acrylic emulsion; 5-10 parts of expanded graphite; and 0.3-0.5 parts of zirconium aluminate coupling agent. The composite corrosion-resistant filler is zinc molybdate modified by 20%-30% aluminum powder in terms of weight percentage. In application, the material is sprayed on the surface of the steel structure, and the total thickness of the dry film after spraying is 2-5 mm, and the coating is formed by curing at room temperature. The coating material forms a synergistic mechanism of corrosion and fire prevention. Experimental results show that when the total thickness of the dry film after spraying is 5 mm, the service life is greater than or equal to 25 years, and the fire resistance limit is greater than or equal to 3 hours.

Description

Technical Field

[0001] This invention belongs to the field of special functional coating materials technology, and specifically relates to an inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures, its preparation and application, which is suitable for the protection of steel structures such as substation architecture and transmission towers exposed to high corrosion and high fire risk environments. Background Technology

[0002] Steel structures in power grid projects, such as substation architecture and transmission towers, are exposed to atmospheric corrosive media (such as moisture, carbon dioxide, and salt) and potential fire hazards for extended periods. Patent CN214183913U discloses a thermal spraying anti-corrosion and fire-resistant composite coating structure for building steel structures. Currently, the protection of such steel structures typically employs a layered coating system of "corrosion protection first, then fire protection," but this system has many limitations in practical applications.

[0003] In terms of corrosion protection, hot-dip galvanizing, cold spray zinc, or organic anti-corrosion coatings (such as epoxy and polyurethane systems) are currently the main methods used. Under the combined effects of multiple factors such as temperature, humidity, stress, and corrosive media, these coatings are prone to problems such as electrochemical corrosion, stress corrosion cracking, and pitting corrosion, which can damage the steel structure substrate and affect the safe operation of the power grid.

[0004] In terms of fire protection, fire-retardant coatings are typically applied over anti-corrosion coatings, and are mainly divided into two categories: non-intumescent and intumescent. Non-intumescent fire-retardant coatings (such as inorganic coatings using expanded vermiculite, perlite, etc. as aggregates) have advantages such as good weather resistance and long service life, but their coating strength is low and their appearance is poor, so they are mostly used in concealed areas. Intumescent fire-retardant coatings, on the other hand, use organic polymers as a base material. When heated, they expand to form a char layer to block heat transfer, but their organic components are at risk of aging, powdering, or peeling off during long-term use, leading to a decrease or even failure of fire-retardant performance.

[0005] Crucially, the compatibility between anti-corrosion coatings and fire-retardant coatings is a significant issue.

[0006] (1) Organic-organic system compatibility issues: Solvents or active ingredients in organic intumescent fire retardant coatings may corrode the underlying organic anti-corrosion coating (such as epoxy primer), resulting in decreased interlayer adhesion and causing blistering and peeling of the fire retardant layer.

[0007] (2) Inorganic-metal system compatibility issues: Inorganic fire retardant coatings (such as phosphate-based coatings) may sometimes react chemically with anti-corrosion coatings rich in active metals (such as zinc and aluminum), leading to coating powdering and failure.

[0008] (3) System failure under thermal cycling: Under high temperature or thermal cycling conditions, the adhesion performance of the bottom anti-corrosion coating may degrade, causing the entire protective system (including the fireproof layer) to fall off and lose its protective function.

[0009] The separation of corrosion protection and fire protection functions in existing technologies not only increases construction complexity and cost, but also reduces the reliability and durability of the protection system due to interlayer compatibility risks. Therefore, developing an integrated coating that combines long-lasting corrosion protection with high-efficiency fire protection and excellent interlayer compatibility is of great significance for ensuring the long-term safe operation of power grid steel structures. Summary of the Invention

[0010] In order to overcome the shortcomings of the prior art, the present invention aims to provide an inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures, its preparation and application, in order to solve the problem of long-term protection of power grid steel structures in complex environments, improve the fire and corrosion resistance of steel structures, extend their service life, and provide strong protection for the safe and efficient operation of power grid projects.

[0011] To achieve the above objectives, in a first aspect, the present invention provides an inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures, comprising the following components by weight:

[0012] 100 parts of lithium silicate solution;

[0013] 40–60 parts of composite anti-corrosion filler;

[0014] 15–20 parts of pure acrylic emulsion;

[0015] 5–10 parts expanded graphite;

[0016] 0.3–0.5 parts of zirconium aluminate coupling agent;

[0017] The composite anti-corrosion filler is zinc molybdate modified with aluminum powder, comprising 20%–30% by weight of aluminum powder.

[0018] In one embodiment of the present invention, the modulus of the lithium silicate solution is 5.0–6.0.

[0019] In one embodiment of the present invention, the lithium silicate solution is prepared by reacting alkaline silica sol, lithium hydroxide, and deionized water at a stirring speed of 180–220 rpm and a temperature of 65–75°C for 3.5–4.5 hours. More preferably, the reaction can be carried out at a stirring speed of 200 rpm and a temperature of 70°C for 4 hours.

[0020] In one embodiment of the present invention, the aluminum powder modified zinc molybdate is prepared by the following method: zinc molybdate powder and aluminum powder are mixed in a ratio of 20%–30% by weight of aluminum powder, and uniform composite is achieved by ball milling, so that aluminum powder is fully dispersed in the gaps between zinc molybdate particles to form a composite anti-corrosion filler with cathodic protection function, which is then sieved for later use.

[0021] In one embodiment of the present invention, the fineness of the zinc molybdate powder is ≤400 mesh, and the ball milling process is performed at a speed of 900–1100 rpm, typically 1000 rpm, for a time of 55–65 minutes, typically 60 minutes.

[0022] A second aspect of the present invention provides a method for preparing the inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures as described in the first aspect, comprising the following steps:

[0023] Step 1: Mix the pure acrylic emulsion with the lithium silicate solution and stir until homogeneous;

[0024] Step 2: Add the composite anti-corrosion filler, the expanded graphite and zirconium aluminate coupling agent to the product of Step 1 and disperse them evenly to obtain the inorganic anti-corrosion and fireproof integrated coating material for power grid steel structure.

[0025] In one embodiment of the present invention, in step 1, the stirring speed is 200–400 rpm and the stirring time is 8–12 minutes; in step 2, the stirring speed is 800–1000 rpm and the stirring time is 6–10 minutes.

[0026] A third aspect of the present invention provides the application of the inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures described in the first aspect, wherein the inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures is sprayed onto the surface of the steel structure, and the total dry film thickness after spraying is 2-5 mm, and the coating is cured at room temperature to form a coating.

[0027] In one embodiment of the present invention, the surface of the power grid steel structure is sandblasted to Sa2.5 level before spraying.

[0028] In one embodiment of the present invention, the coating has a corrosion resistance of ≥1100 hours with salt spray resistance and a fire resistance limit of ≥3 hours.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] When aluminum powder-modified zinc molybdate is used as a composite anti-corrosion filler in this invention, on the one hand, the aluminum powder (20%–30% by weight) preferentially oxidizes in the corrosive environment to form a dense alumina film, which improves high-temperature oxidation resistance (refractory aid). On the other hand, since the standard electrode potential of aluminum powder is significantly lower than that of the steel substrate, the potential difference between the two drives sacrificial anode protection, continuously providing electrons to the steel substrate and inhibiting its electrochemical corrosion. At the same time, the dense alumina film generated by the oxidation of aluminum powder further blocks the penetration of corrosive media, thereby achieving a dual protection mechanism for the steel substrate (cathode protection + physical shielding).

[0031] Zinc molybdate, as the core substrate of composite anti-corrosion fillers, is primarily based on its unique physicochemical properties and synergistic effects of multiple functions. Zinc molybdate itself is a highly efficient and environmentally friendly corrosion inhibitor that can form a dense and stable passivation film on steel surfaces, effectively blocking the penetration of corrosive media such as water, oxygen, and chloride ions. Simultaneously, zinc molybdate possesses excellent thermal stability and chemical inertness, and is not easily decomposed at high temperatures, allowing it to synergistically enhance the high-temperature oxidation resistance of the coating with aluminum powder. Furthermore, the combination of zinc molybdate and aluminum powder not only provides cathodic protection through the sacrificial anodic effect of the aluminum powder but also further inhibits localized corrosion through the passivation effect of zinc molybdate, forming a triple anti-corrosion mechanism of "physical shielding + electrochemical protection + passivation corrosion inhibition," significantly improving the coating's long-term anti-corrosion capability and fire resistance synergy in harsh environments.

[0032] The expanded graphite introduced in this invention expands 50-100 times in volume at high temperature (≥300℃) to form a worm-like porous carbon layer, which significantly improves the equivalent thermal resistance of the coating. This carbon layer is intertwined with the alumina-alumina carbide composite ceramic generated by the oxidation of aluminum powder, which synergistically enhances the stability of the carbon layer skeleton and improves the overall thermal resistance by 25%-30%.

[0033] Thus, the coating material of this invention forms a synergistic mechanism of corrosion resistance and fire resistance. Experimental results show that when the total dry film thickness after spraying is 5 mm, the service life is ≥25 years and the fire resistance limit is ≥3 hours. Attached Figure Description

[0034] Figure 1 This is a flowchart illustrating the preparation process of the coating of the present invention.

[0035] Figure 2 Comparison images of the integrated coatings obtained in different embodiments after 1100 hours of salt spray testing, from left to right: Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, and Embodiment 6.

[0036] Figure 3 This is a back temperature curve of the coated steel plate in Example 4.

[0037] Figure 4 This is a microscopic image of the coating in Example 4 magnified 3000 times. Detailed Implementation

[0038] To further illustrate the technical solution of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0039] As a crucial component of power grid engineering, steel structures require exceptional corrosion and fire protection. The corrosion and fire risks associated with steel structures directly threaten the normal operation of the power grid. To address this, this invention provides an integrated inorganic anti-corrosion and fire-resistant coating material for power grid steel structures. By optimizing the component ratio and construction process, it achieves synergistic effects of corrosion protection (salt spray resistance ≥1100 hours) and fire protection (fire resistance limit ≥3 hours), solving the challenge of long-term protection for power grid steel structures in complex environments. The coating is environmentally friendly, VOC-free, and has a long expected service life, making it suitable for substation structures, transmission towers, and other similar applications.

[0040] Specifically, by weight, the integrated coating material of the present invention comprises the following: 100 parts lithium silicate solution; 40–60 parts composite anti-corrosion filler; 15–20 parts pure acrylic emulsion; 5–10 parts expanded graphite; and 0.3–0.5 parts zirconium aluminate coupling agent.

[0041] The lithium silicate solution uses a high-modulus product with a modulus of 5.0–6.0, which serves as the base material and can self-cures to form a film during application. The composite anti-corrosion filler is aluminum powder modified zinc molybdate with an aluminum powder weight percentage of 20%–30%, which acts as an anti-corrosion agent. Pure acrylic emulsion acts as a modifier to improve the product's flexibility. Expanded graphite can expand and retard at high temperatures, thereby improving fire resistance. Zirconium aluminate coupling agent acts as an interfacial bonding strengthener to improve the overall performance of the coating. Among the above components, except for the pure acrylic emulsion, all are inorganic materials, exhibiting good synergy. Furthermore, except for the composite anti-corrosion filler which requires preparation, the other raw materials are commercially available. It is easy to understand that there are no special requirements for the various raw materials used in this invention; they can be selected according to conventional standards used in the fields of corrosion prevention or fire protection.

[0042] refer to Figure 1 As shown, the preparation method of the coating material of the present invention includes the following steps:

[0043] Step 1: Prepare lithium silicate solution.

[0044] Alkaline silica sol 1, lithium hydroxide 2, and deionized water 3 are mixed to achieve a lithium silicate solution modulus of 5.0–6.0. ​​The mixture is then reacted for 3.5–4.5 hours at a stirring speed of 180–220 rpm and a temperature of 65–75°C. It is worth noting that in this invention, the modulus, stirring speed, temperature, and reaction time are recommended to be selected within the above ranges. However, except for the modulus, the other parameters are not strictly limited. The stirring speed, temperature, and reaction time can be adjusted as needed, with the goal of obtaining a homogeneous lithium silicate solution with a set modulus. Obviously, higher temperatures and faster stirring speeds result in shorter reaction times, and vice versa. Therefore, recommended reaction conditions include:

[0045] 200 rpm, 70℃, reaction time 4 hours.

[0046] 180 rpm, 75°C, reaction time 4 hours.

[0047] 180 rpm, 65°C, reaction time 4.5 hours.

[0048] 220 rpm, 75°C, reaction time 4 hours.

[0049] 220 rpm, 65°C, reaction time 3.5 hours.

[0050] Step 2: Modification of the base material.

[0051] Pure acrylic emulsion 4 (15%–20% of the base material weight) was added to the lithium silicate solution obtained in step 1 and stirred at low speed until homogeneous to obtain modified lithium silicate solution 7.

[0052] Similar to step 1, the stirring speed in this step is inversely proportional to the stirring time. Recommended stirring conditions include:

[0053] Stir at 200 rpm for 12 minutes.

[0054] Stir at 300 rpm for 10 minutes.

[0055] Stir at 400 rpm for 8 minutes.

[0056] Step 3: Prepare composite anti-corrosion filler 6.

[0057] Zinc molybdate powder and aluminum powder are mixed at a ratio of 20%–30% by weight of aluminum powder and uniformly compounded to ensure that the aluminum powder is fully dispersed in the gaps between the zinc molybdate particles, forming a composite anti-corrosion filler with cathodic protection function. After sieving, it is ready for use.

[0058] To ensure a uniform composite effect, in this invention, the fineness of zinc molybdate powder is recommended to be ≤400 mesh, while the fineness of aluminum powder is recommended to be between 400-600 mesh.

[0059] Uniform compounding can be achieved through ball milling. Recommended ball milling process conditions include:

[0060] 900 RPM, 65 minutes.

[0061] 1000 RPM, 60 minutes.

[0062] 1100 RPM, 55 minutes.

[0063] Step 4: Filler compounding.

[0064] Composite anti-corrosion filler 6, expanded graphite 8 and zirconium aluminate coupling agent 5 are added to the modified lithium silicate solution 7 obtained in step 2 and dispersed evenly to obtain the integrated coating material 9 of the present invention.

[0065] Uniform dispersion here can be achieved through high-speed mixing. Recommended mixing conditions include:

[0066] Stir at 800 rpm for 10 minutes.

[0067] Stir at 900 rpm for 8 minutes.

[0068] Stir at 1000 rpm for 6 minutes.

[0069] In application, the surface of Q345 steel structure is sandblasted to Sa2.5 grade as substrate 10. Then, the prepared integrated coating material 9 is attached to the surface of substrate 10 by spraying or dipping. The total thickness of the dry film after spraying is 2-5 mm. The coating can be formed by curing at room temperature for about 24 hours.

[0070] The following are some specific embodiments of the present invention.

[0071] Example 1

[0072] Components of an inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures (by weight):

[0073] 100 parts of lithium silicate solution (modulus 5.0); 40 parts of composite anti-corrosion filler (20% by weight of aluminum powder); 15 parts of pure acrylic emulsion; 5 parts of expanded graphite; 0.3 parts of zirconium aluminate coupling agent.

[0074] Preparation process:

[0075] Step 1: Mix the lithium silicate solution with pure acrylic emulsion at a stirring speed of 200 rpm for 12 minutes.

[0076] Step 2: Add the remaining components to the product from Step 1, and stir at 800 rpm for 10 minutes.

[0077] Construction parameters:

[0078] Total dry film thickness after spraying: 2 mm.

[0079] Curing conditions: Curing at room temperature for 24 hours.

[0080] Example 2

[0081] Components of an inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures (by weight):

[0082] 100 parts of lithium silicate solution (modulus 6.0); 60 parts of composite anti-corrosion filler (30% by weight of aluminum powder); 20 parts of pure acrylic emulsion; 10 parts of expanded graphite; 0.5 parts of zirconium aluminate coupling agent.

[0083] Preparation process:

[0084] Step 1: Mix the lithium silicate solution with pure acrylic emulsion at a stirring speed of 400 rpm for 8 minutes.

[0085] Step 2: Add the remaining components to the product from Step 1, and stir at 1000 rpm for 6 minutes.

[0086] Construction parameters:

[0087] Total dry film thickness after spraying: 5 mm.

[0088] Curing conditions: Curing at room temperature for 24 hours.

[0089] Example 3

[0090] Components of an inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures (by weight):

[0091] 100 parts of lithium silicate solution (modulus 5.5); 50 parts of composite anti-corrosion filler (25% aluminum powder by weight); 17.5 parts of pure acrylic emulsion; 7.5 parts of expanded graphite; 0.4 parts of zirconium aluminate coupling agent.

[0092] Preparation process:

[0093] Step 1: Mix the lithium silicate solution with pure acrylic emulsion at a stirring speed of 300 rpm for 10 minutes.

[0094] Step 2: Add the remaining components to the product from Step 1, and stir at 900 rpm for 8 minutes.

[0095] Construction parameters:

[0096] Total dry film thickness after spraying: 3.5 mm.

[0097] Curing conditions: Curing at room temperature for 24 hours.

[0098] Example 4

[0099] Components of an inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures (by weight):

[0100] 100 parts of lithium silicate solution (modulus 5.2); 45 parts of composite anti-corrosion filler (22% aluminum powder by weight); 16 parts of pure acrylic emulsion; 6 parts of expanded graphite; 0.35 parts of zirconium aluminate coupling agent.

[0101] Preparation process:

[0102] Step 1: Mix the lithium silicate solution with pure acrylic emulsion at a stirring speed of 250 rpm for 11 minutes.

[0103] Step 2: Add the remaining components to the product from Step 1, and stir at 950 rpm for 7 minutes.

[0104] Construction parameters:

[0105] Total dry film thickness after spraying: 2.5 mm.

[0106] Curing conditions: Curing at room temperature for 24 hours.

[0107] Example 5

[0108] Components of an inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures (by weight):

[0109] 100 parts of lithium silicate solution (modulus 5.8); 55 parts of composite anti-corrosion filler (28% by weight of aluminum powder); 19 parts of pure acrylic emulsion; 9 parts of expanded graphite; 0.45 parts of zirconium aluminate coupling agent.

[0110] Preparation process:

[0111] Step 1: Mix the lithium silicate solution with pure acrylic emulsion at a stirring speed of 350 rpm for 9 minutes.

[0112] Step 2: Add the remaining components to the product from Step 1, and stir at 850 rpm for 9 minutes.

[0113] Construction parameters:

[0114] Total dry film thickness after spraying: 4.5 mm.

[0115] Curing conditions: Curing at room temperature for 24 hours.

[0116] Example 6

[0117] Components of an inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures (by weight):

[0118] 100 parts of lithium silicate solution (modulus 5.5); 50 parts of composite anti-corrosion filler (aluminum powder content 25%); 15 parts of pure acrylic emulsion; 10 parts of expanded graphite; 0.4 parts of zirconium aluminate coupling agent.

[0119] Preparation process:

[0120] Step 1: Mix the lithium silicate solution with pure acrylic emulsion at a stirring speed of 300 rpm for 10 minutes;

[0121] Step 2: Add the remaining components to the product from Step 1, and stir at 900 rpm for 8 minutes.

[0122] Construction parameters:

[0123] Total dry film thickness after spraying: 4.0 mm.

[0124] Curing conditions: Curing at room temperature for 24 hours.

[0125] The performance of the above embodiments was tested, including:

[0126] (1) Salt spray resistance test.

[0127] Standard: GB / T 1771-2007.

[0128] Equipment: Q-FOG CCT-1100 salt spray chamber.

[0129] Parameters: 5% sodium chloride solution (by weight), 35±2℃, spray volume 1.5 ml / 80 cm² / hour.

[0130] Judgment: Observe the coating for blistering / peeling every 240 hours. The coating is considered acceptable if the corrosion width on one side of the cross is ≤2 mm.

[0131] (2) Fire resistance limit test.

[0132] Standard: GB 14907-2018.

[0133] Equipment: Vertical combustion furnace (heating curve ISO 834).

[0134] Judgment: Back temperature reaches 540℃ or the integrity is lost.

[0135] (3) Adhesion test.

[0136] Method: GB / T 5210-2016 Pull-open method.

[0137] Equipment: PosiTest AT-A Adhesion Tester.

[0138] The performance test results are shown in the table below:

[0139]

[0140] Figure 2 The comparison of salt spray corrosion rates of the various embodiments is shown. It can be seen that Example 4 has the best salt spray resistance, which is consistent with the data in the table above.

[0141] Figure 3 The back temperature curve of the fire resistance limit for Example 4 is shown. It can be seen that under the standard fire temperature rise curve, the back temperature of the steel plate coated with the integrated coating of this invention rises slowly. During the 3-hour test, the back temperature of the steel plate remained well below the critical failure temperature of 540°C. This indicates that the coating provides excellent thermal insulation protection and successfully meets the fire resistance limit requirement of ≥3 hours.

[0142] Figure 4 The image shows a 3000x magnified microscopic image of the coating of Example 4. It can be seen that the coating exhibits a dense and uniform microstructure, with the filler well dispersed in the matrix and tightly bonded at the interface. This structure effectively blocks the penetration of corrosive media and provides a pathway for cathodic protection. At the same time, it lays the structural foundation for the formation of a stable heat-insulating carbon layer at high temperatures. The microscopic level confirms the mechanism by which the coating has both excellent anti-corrosion and fire-resistant properties.

Claims

1. An inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures, characterized in that, With weight Measurement, components are as follows: 100 parts of lithium silicate solution, wherein the modulus of the lithium silicate solution is 5.0-6.0, are prepared by reacting alkaline silica sol, lithium hydroxide and deionized water at a stirring speed of 180-220 rpm and a temperature of 65-75°C for 3.5-4.5 hours. 40-60 parts of composite anti-corrosion filler; 15-20 parts of pure acrylic emulsion; 5-10 parts expanded graphite; 0.3–0.5 parts of zirconium aluminate coupling agent; The composite anti-corrosion filler is aluminum powder modified zinc molybdate with an aluminum powder weight percentage of 20%-30%, and is prepared by the following method: zinc molybdate powder and aluminum powder are mixed at a ratio of 20%-30% of aluminum powder weight, and uniform composite is achieved by ball milling, so that the aluminum powder is fully dispersed in the gaps between the zinc molybdate particles to form a composite anti-corrosion filler with cathodic protection function. The fineness of the zinc molybdate powder is ≤400 mesh.

2. The inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures according to claim 1, characterized in that, The ball milling process is performed at a speed of 900-1100 rpm for 55-65 minutes.

3. The preparation method of the inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures according to claim 1, characterized in that, The steps are as follows: Step 1: Mix the pure acrylic emulsion with the lithium silicate solution and stir until homogeneous; Step 2: Add the composite anti-corrosion filler, the expanded graphite and zirconium aluminate coupling agent to the product of Step 1, and disperse them evenly to obtain the inorganic anti-corrosion and fireproof integrated coating material for power grid steel structure.

4. The preparation method of the inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures according to claim 3, characterized in that, In step 1, the stirring speed is 200-400 rpm and the stirring time is 8-12 minutes; in step 2, the stirring speed is 800-1000 rpm and the stirring time is 6-10 minutes.

5. The application of the inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures as described in claim 1, characterized in that, The inorganic anti-corrosion and fireproof integrated coating material for the power grid steel structure is sprayed onto the surface of the steel structure. The total thickness of the dry film after spraying is 2-5 mm, and the coating is cured at room temperature.

6. The application of the inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures according to claim 5, characterized in that, Before spraying, the surface of the power grid steel structure is sandblasted to Sa2.5 level.

7. The application of the inorganic anti-corrosion and fireproof integrated coating material for power grid steel structures according to claim 5, characterized in that, The coating has a salt spray resistance of ≥1100 hours and a fire resistance limit of ≥3 hours.

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