阅读说明：本技术 一种耐海洋性气候的钢结构铁塔的防腐处理方法 (Anti-corrosion treatment method for steel structure iron tower resistant to marine climate ) 是由 蒋穹 刘学然 杨子润 王占红 颜韬 翁帅 马尧尧 于 2021-08-04 设计创作，主要内容包括：本发明公开了一种耐海洋性气候的钢结构铁塔的防腐处理方法,涉及金属防腐技术领域。包括以下步骤：对钢结构表面依次进行除油、除锈、除湿处理；随后向钢结构表面进行喷涂防腐底漆,固化后形成底漆层；在底漆层表面进行喷涂一层中间漆,并在喷涂的过程中覆一层纤维网布,待一层中间漆将纤维网布粘结于底漆层表面,并固化后,在纤维网布表面继续喷涂至少两层中间漆,固化后形成中间漆层；最后在所述中间漆层表面喷涂面漆。本发明提供的能够有效提升防腐涂层的整体抗裂性,从而增强了防腐涂层对钢结构的保护。(The invention discloses an anti-corrosion treatment method for a steel structure iron tower resistant to marine climate, and relates to the technical field of metal corrosion prevention. The method comprises the following steps: sequentially carrying out oil removal, rust removal and dehumidification on the surface of the steel structure; then spraying an anticorrosive primer on the surface of the steel structure, and forming a primer layer after curing; spraying a layer of intermediate paint on the surface of the primer layer, covering a layer of fiber mesh cloth in the spraying process, bonding the fiber mesh cloth on the surface of the primer layer by using the layer of intermediate paint, curing, continuously spraying at least two layers of intermediate paint on the surface of the fiber mesh cloth, and curing to form an intermediate paint layer; and finally, spraying finish paint on the surface of the intermediate paint layer. The invention can effectively improve the integral crack resistance of the anticorrosive coating, thereby enhancing the protection of the anticorrosive coating on a steel structure.)

1. An anti-corrosion treatment method for a steel structure iron tower resistant to marine climate is characterized by comprising the following steps:

sequentially carrying out oil removal, rust removal and dehumidification on the surface of the steel structure;

then spraying an anticorrosive primer on the surface of the steel structure, and forming a primer layer after curing;

spraying a layer of intermediate paint on the surface of the primer layer, covering a layer of fiber mesh cloth in the spraying process, bonding the fiber mesh cloth on the surface of the primer layer by using the layer of intermediate paint, curing, continuously spraying at least two layers of intermediate paint on the surface of the fiber mesh cloth, and curing to form an intermediate paint layer;

and finally, spraying finish paint on the surface of the intermediate paint layer.

2. The anticorrosion treatment method for the steel structure iron tower resistant to the marine climate according to claim 1, wherein a spraying and coating net device is adopted, a layer of intermediate paint is sprayed on the surface of the primer layer, and a layer of fiber mesh cloth is coated in the spraying process; wherein, the spray coating net device comprises:

two symmetrically arranged first connecting rods (11); and

a compression roller (1) is arranged between the same ends of the two first connecting rods (11), and a guide roller (10) is arranged between the other same ends;

two ends of the compression roller (1) are rotatably connected with the two first connecting rods (11) through pivots;

two ends of the guide roller (10) are rotatably connected with the two first connecting rods (11) through pivots;

a fiber net cloth roller (2) is further arranged above the compression roller (1), the fiber net cloth roller (2) is arranged in parallel with the compression roller (1), two ends of the fiber net cloth roller (2) are respectively connected with the two first connecting rods (11) through second connecting rods (21), and two ends of the fiber net cloth roller (2) are rotatably connected with the end parts of the two second connecting rods (21) through pivots;

compression roller (1) with be equipped with coating nozzle (4) between guide roll (10), coating nozzle (4) set up in two on the third connecting rod that is equipped with between head rod (11), coating nozzle (4) orientation the bottom of compression roller (1), coating nozzle (4) are through body (42) and coating feed box (41) intercommunication.

3. The method for the anticorrosion treatment of steel structure iron tower resisting marine climate according to claim 2, characterized in that at least two paint nozzles (4) are provided.

4. The anticorrosion treatment method for the steel structure iron tower resistant to the marine climate according to claim 3, wherein a layer of intermediate paint is sprayed on the surface of the primer layer, and a layer of fiber mesh cloth is coated in the spraying process, and the method is specifically carried out according to the following steps:

and drawing out the end part of the fiber mesh cloth wound on the fiber mesh cloth roller (2) wound on the outer ring, penetrating through the bottom of the press roller (1), spraying intermediate paint to the surface of the primer layer by using a paint nozzle (4) while rolling forwards through a guide roller (10), pressing the fiber mesh cloth on the surface of the primer layer by using the rolling press roller (1), and bonding the surface of the primer layer by using the fiber mesh cloth under the action of the intermediate paint.

5. The method for the anticorrosion treatment of the steel structure iron tower resistant to the marine climate according to claim 1, wherein the anticorrosion primer is a water-based epoxy Al-Zn-Mg-Si multi-element alloy primer, and the raw materials of the anticorrosion primer comprise the following components in percentage by mass:

20-30% of flake aluminum-zinc-magnesium-silicon multi-element alloy powder, 8-12% of binder, 1.5-3% of corrosion inhibitor, 5-10% of sintering protective agent, 8-12% of wetting dispersant, 0.5-1.5% of quaternary ammonium titanate, 1-3% of additive, 0.1-1% of thickener, 0.1-0.8% of defoaming agent and the balance of water;

the aluminum-zinc-magnesium-silicon multi-element alloy powder comprises the following components in percentage by mass of 55.5: 3.2: 0.35: 18.2 aluminum, magnesium, silicon and zinc, wherein the particle size of the aluminum-zinc-magnesium-silicon multi-element alloy powder sheet is 10-20 mu m, the sheet thickness is 0.1-0.3 mu m, and the length-diameter ratio is more than 30.

6. The method for the anticorrosion treatment of the steel structure iron tower resistant to the marine climate according to claim 5, wherein the adhesive is prepared from the following components in a mass ratio of 20: 6, the waterborne epoxy silane coupling agent and the waterborne modified acrylic resin; the water-based epoxy silane coupling agent is prepared from a silane coupling agent, methanol and water in a volume ratio of 1:1: 3;

the corrosion inhibitor is sodium molybdate or sodium phosphomolybdate;

the sintering protective agent is glycol;

the wetting dispersant is Tween 20 or OP 10;

the additive is graphene or carbon nanotubes.

7. The method for the anticorrosion treatment of the steel structure iron tower resistant to the marine climate according to claim 6, wherein the anticorrosion primer is prepared by the following steps:

dissolving a wetting dispersant, quaternary ammonium titanate and a sintering protective agent in partial water, and stirring the solution to be viscous; and sequentially adding the aluminum-zinc-magnesium-silicon multi-element alloy powder, the additive and the defoaming agent in the continuous stirring process until the slurry is uniform, adding the binder, the corrosion inhibitor, the thickening agent and the rest water into the uniform slurry, and uniformly mixing to obtain the anticorrosive primer.

8. The method for performing the anticorrosion treatment on the steel structure iron tower resistant to the marine climate according to claim 5, wherein at least two layers are sprayed when the anticorrosion primer is sprayed, and after each layer is sprayed, the steel structure iron tower is pre-dried at 120-130 ℃ for 5-7 min and then cured at 250-280 ℃ for 30-40 min.

9. The method for the anticorrosion treatment of the steel structure iron tower resistant to the marine climate according to claim 1, wherein the intermediate paint is an epoxy micaceous iron intermediate paint; the finish paint is fluorocarbon finish paint.

10. The method for performing the anticorrosion treatment on the steel structure iron tower resistant to the marine climate according to claim 1, wherein the fiber mesh cloth is alkali-free glass fiber mesh cloth, and the mass of the alkali-free glass fiber mesh cloth is 30-50 g/m²The size of the square mesh is 3-5 mm.

Technical Field

The invention relates to the technical field of metal surface corrosion prevention, in particular to a marine climate resistant steel structure iron tower corrosion prevention treatment method.

Background

The offshore and oceaneering equipment is in the environment with much rain, high temperature, salt fog and strong wind current, parts exposed outside are subjected to the comprehensive action of strong atmospheric corrosion, electrochemical corrosion and air current scouring corrosion, and the service life of various steel structures is far shorter than that of the general inland outdoor environment. The service condition is generally more than C5 level according to ISO9225 environmental evaluation standard, and belongs to extremely severe environment.

For example, steel structure iron towers in service under the marine climate condition and wind power generation equipment are exposed in extreme corrosive atmosphere directly due to the fact that external components of the unit, such as engine room, engine hood, tower, blade root flange gasket, connecting bolt, connecting spring and the like, are exposed in the extreme corrosive atmosphere, and the conventional protection measures are adopted, so that severe corrosion is often generated only for months.

At present, the surface of a steel structure is mainly subjected to anticorrosion treatment by a hot-dip coating process or a form of directly spraying an anticorrosion coating; by utilizing the hot-dip process, the temperature of the metal surface is required to be overhigh in the treatment process, the metal surface is easy to be oxidized and deformed, and the pollution of smoke dust, dust and metal hot steam is serious in the operation process; the wear resistance is insufficient, and the erosion resistance is not strong; is not suitable for large-area workpiece treatment and field operation, and has limited application. The existing steel structure surface adopts the spraying multilayer anticorrosive coating to carry out anticorrosive treatment, form through direct spraying anticorrosive coating is to metal surface after, carry out the surface to it through the outer coating of spraying certain thickness after, resist the marine climate condition, because marine climate condition is very abominable, still can cause the protective layer on anticorrosive coating surface can split easily, thereby can arouse inside anticorrosive coating fracture, not only can crack, also can arouse droing of anticorrosive coating, so corrode and can deepen along the crack is continuous.

Therefore, the research and development of an effective new process for treating the surface of the ocean engineering part becomes an urgent need for the development of industries such as ocean engineering, offshore wind power and the like.

Disclosure of Invention

In order to solve the defects in the background technology, an anti-corrosion treatment method for a steel structure iron tower resistant to marine climate is provided. According to the method, a layer of fiber mesh cloth is laid between the primer and the intermediate paint, and a corrosion-resistant, wear-resistant, erosion-resistant and weather-resistant composite coating is formed on the surface of a steel structure, so that the corrosion-resistant primer layer is prevented from cracking due to the action of the external environment; the fiber mesh cloth not only provides a framework integrally attached to the surface of the primer layer for the intermediate paint layer, but also plays a role in preventing cracking of the primer layer, and can effectively improve the integral cracking resistance of the whole anticorrosive coating, thereby enhancing the protection of the anticorrosive coating on a steel structure.

The invention aims to provide an anti-corrosion treatment method for a steel structure iron tower resistant to marine climate, which comprises the following steps:

sequentially carrying out oil removal, rust removal and dehumidification on the surface of the steel structure;

then spraying an anticorrosive primer on the surface of the steel structure, and forming a primer layer after curing;

spraying a layer of intermediate paint on the surface of the primer layer, covering a layer of fiber mesh cloth in the spraying process, bonding the fiber mesh cloth on the surface of the primer layer by using the layer of intermediate paint, curing, continuously spraying at least two layers of intermediate paint on the surface of the fiber mesh cloth, and curing to form an intermediate paint layer;

and finally, spraying finish paint on the surface of the intermediate paint layer.

Preferably, a spraying and coating net device is adopted, a layer of intermediate paint is sprayed on the surface of the primer layer, and a layer of fiber mesh cloth is coated in the spraying process; wherein, the spray coating net device comprises:

two first connecting rods which are symmetrically arranged; and

a compression roller is arranged between the same ends of the two first connecting rods, and a guide roller is arranged between the other same ends of the two first connecting rods;

two ends of the compression roller are rotationally connected with the two first connecting rods through pivots;

two ends of the guide roller are rotatably connected with the two first connecting rods through pivots;

a fiber mesh cloth roller is further arranged above the compression roller, the fiber mesh cloth roller and the compression roller are arranged in parallel, two ends of the fiber mesh cloth roller are respectively connected with the two first connecting rods through second connecting rods, and two ends of the fiber mesh cloth roller are rotatably connected with the end parts of the two second connecting rods through pivots;

the coating machine comprises a compression roller, a guide roller and a coating nozzle, wherein the coating nozzle is arranged between the compression roller and the guide roller, the coating nozzle is arranged on a third connecting rod arranged between two first connecting rods, the coating nozzle faces the bottom of the compression roller, and the coating nozzle is communicated with a coating feeding box through a pipe body.

More preferably, the coating material nozzle is provided with at least two.

More preferably, a layer of intermediate paint is sprayed on the surface of the primer layer, and a layer of fiber mesh cloth is coated in the spraying process, specifically, the spraying process comprises the following steps:

and drawing out the end part of the fiber mesh cloth wound on the fiber mesh cloth roller, penetrating through the bottom of the compression roller, spraying intermediate paint to the surface of the primer layer by using a paint nozzle while rolling forwards through the guide roller, pressing the fiber mesh cloth on the surface of the primer layer by using the rolling compression roller, and bonding the surface of the primer layer by using the fiber mesh cloth under the action of the intermediate paint.

Preferably, the anticorrosion primer is a water-based epoxy Al-Zn-Mg-Si multi-element alloy primer, and the raw materials of the anticorrosion primer comprise the following components in percentage by mass:

20-30% of flake aluminum-zinc-magnesium-silicon multi-element alloy powder, 8-12% of binder, 1.5-3% of corrosion inhibitor, 5-10% of sintering protective agent, 8-12% of wetting dispersant, 0.5-1.5% of quaternary ammonium titanate, 1-3% of additive, 0.1-1% of thickener, 0.1-0.8% of defoaming agent and the balance of water;

the aluminum-zinc-magnesium-silicon multi-element alloy powder comprises the following components in percentage by mass of 55.5: 3.2: 0.35: 18.2 aluminum, magnesium, silicon and zinc, wherein the particle size of the aluminum-zinc-magnesium-silicon multi-element alloy powder sheet is 10-20 mu m, the sheet thickness is 0.1-0.3 mu m, and the length-diameter ratio is more than 30.

More preferably, the binder is prepared from a mass ratio of 20: 6, the waterborne epoxy silane coupling agent and the waterborne modified acrylic resin; the water-based epoxy silane coupling agent is prepared from a silane coupling agent, methanol and water in a volume ratio of 1:1: 3;

the corrosion inhibitor is sodium molybdate or sodium phosphomolybdate;

the sintering protective agent is glycol;

the wetting dispersant is Tween 20 or OP 10;

the additive is graphene or carbon nanotubes.

More preferably, the anticorrosion primer is prepared by the following steps:

dissolving a wetting dispersant, quaternary ammonium titanate and a sintering protective agent in partial water, and stirring the solution to be viscous; and sequentially adding the aluminum-zinc-magnesium-silicon multi-element alloy powder, the additive and the defoaming agent in the continuous stirring process until the slurry is uniform, adding the binder, the corrosion inhibitor, the thickening agent and the rest water into the uniform slurry, and uniformly mixing to obtain the anticorrosive primer.

More preferably, at least two layers are sprayed when the anti-corrosion primer is sprayed, and after each layer is sprayed, the pre-drying is carried out at 120-130 ℃ for 5-7 min, and then the curing is carried out at 250-280 ℃ for 30-40 min.

Preferably, the intermediate paint is epoxy micaceous iron intermediate paint; the finish paint is fluorocarbon finish paint.

Preferably, the fiber mesh cloth is alkali-free glass fiber mesh cloth, and the mass of the alkali-free glass fiber mesh cloth is 30-50 g/m²The size of the square mesh is 3-5 mm.

Compared with the prior art, the invention has the beneficial effects that:

according to the anti-corrosion treatment method for the steel structure iron tower resistant to marine climate, provided by the invention, the fiber mesh cloth is laid between the primer and the intermediate paint, and the anti-corrosion, wear-resistant, erosion-resistant and weather-resistant composite coating is formed on the surface of the steel structure, so that the anti-corrosion primer layer is prevented from cracking due to the action of the external environment, the overall crack resistance of the whole anti-corrosion coating can be effectively improved, and the protection of the steel structure by the anti-corrosion coating is enhanced.

The fiber mesh cloth wound on the fiber mesh cloth roller is drawn out from the end part of the outer ring and penetrates through the bottom of the compression roller through the spraying mesh device, the fiber mesh cloth rolls forwards through the guide roller, meanwhile, the coating nozzle is used for spraying the intermediate paint to the surface of the primer layer, the fiber mesh cloth is pressed on the surface of the primer layer through the rolling compression roller, the fiber mesh cloth is bonded on the surface of the primer layer under the action of the intermediate paint, the fiber mesh cloth is effectively pressed on the surface of the primer layer, and a large amount of intermediate paint is filled between the fiber mesh cloth and the primer layer and between the fiber mesh cloth and the self mesh, so that the fiber mesh cloth is bonded on the surface of the primer layer under the action of the intermediate paint, and the efficiency of spraying the intermediate paint and laying the fiber mesh cloth is greatly improved. In addition, the fiber mesh cloth adopted by the invention is alkali-free glass fiber mesh cloth and has stronger bonding force with the epoxy micaceous iron oxide intermediate paint, so that the fiber mesh cloth has stronger bonding force between the intermediate paint and the primer layer, thereby further improving the overall anti-cracking performance of the coating.

According to the invention, the fiber mesh cloth is laid between the primer and the intermediate paint, the concave-convex surface can be formed between the primer layer and the intermediate paint layer, the overall performance of the intermediate paint layer can be effectively enhanced, meanwhile, the cracking of the intermediate paint layer and the surface layer caused by the severe environment is avoided under the action of the fiber mesh cloth, the cracking of the anticorrosion primer layer caused by the cracking of the intermediate paint layer is also avoided, the fiber mesh cloth not only provides a framework integrally attached to the surface of the primer layer for the intermediate paint layer, but also plays a role of preventing the cracking of the primer layer, so that the overall cracking resistance of the composite coating is effectively improved, the anticorrosion life of the steel structure is greatly prolonged, and at least more than 20 years.

Drawings

Fig. 1 is a schematic structural view of a spraying and screen-covering device provided by the invention.

Detailed Description

In order to make the technical solutions of the present invention better understood and enable those skilled in the art to practice the present invention, the following embodiments are further described, but the present invention is not limited to the following embodiments.

The following examples employ a spray-coated mesh device, see fig. 1, comprising:

two symmetrically arranged first connecting rods 11; and

a compression roller 1 is arranged between the same ends of the two first connecting rods 11, and a guide roller 10 is arranged between the other same ends;

two ends of the compression roller 1 are rotationally connected with two first connecting rods 11 through pivots;

two ends of the guide roller 10 are rotatably connected with two first connecting rods 11 through pivots;

a fiber net cloth roller 2 is further arranged above the press roller 1, the fiber net cloth roller 2 is arranged in parallel with the press roller 1, two ends of the fiber net cloth roller 2 are respectively connected with the two first connecting rods 11 through second connecting rods 21, and two ends of the fiber net cloth roller 2 are rotatably connected with the end parts of the two second connecting rods 21 through pivots;

a coating nozzle 4 is arranged between the compression roller 1 and the guide roller 10, the coating nozzle 4 is arranged on a third connecting rod arranged between the two first connecting rods 11, the coating nozzle 4 faces the bottom of the compression roller 1, and the coating nozzle 4 is communicated with a coating feeding box 41 through a pipe body 42; in addition, hand-held rods 5 can be arranged at the two ends of the fiber web cloth roller 2, so that the operation of constructors is facilitated.

The coating material nozzle 4 is provided with at least two.

The anti-corrosion primer adopted in each embodiment is a water-based epoxy Al-Zn-Mg-Si multi-element alloy primer, and the raw materials of the anti-corrosion primer comprise the following components in percentage by mass:

25% of flake aluminum-zinc-magnesium-silicon multi-element alloy powder, 10% of binder, 2% of corrosion inhibitor, 7.5% of sintering protective agent, 10% of wetting dispersant, 1% of quaternary ammonium titanate, 2.5% of additive, 0.8% of thickening agent, 0.5% of defoaming agent and the balance of water;

the aluminum-zinc-magnesium-silicon multi-element alloy powder comprises the following components in percentage by mass of 55.5: 3.2: 0.35: 18.2 of aluminum, magnesium, silicon, zinc; the particle size of the aluminum-zinc-magnesium-silicon multi-element alloy powder sheet is 10-20 mu m, the sheet thickness is 0.1-0.3 mu m, and the length-diameter ratio is more than 30;

the adhesive is prepared from the following components in percentage by mass of 20: 6, the waterborne epoxy silane coupling agent and the waterborne modified acrylic resin; the water-based epoxy silane coupling agent is prepared from silane coupling agent, methanol and water in a volume ratio of 1:1: 3;

the silane coupling agent is gamma-glycidoxypropyltrimethoxysilane, beta- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane or gamma-glycidoxypropyltriethoxysilane;

the silane coupling agent used in the following examples was β - (3, 4-epoxycyclohexyl) ethyltrimethoxysilane, available from the ark (Buddha) chemical materials, Inc.;

the aqueous modified acrylic resins used in the examples described below were obtained from bisnew aqueous materials (Guangzhou) Inc.

The corrosion inhibitor is sodium phosphomolybdate; the sintering protective agent is glycol; the wetting dispersant is Tween 20; the additive is carbon nano-tube.

The anti-corrosion primer is prepared by the following steps:

dissolving wetting dispersant, quaternary ammonium titanate and sintering protective agent in part of water, and stirring the solution at a high speed to be viscous; and sequentially adding the aluminum-zinc-magnesium-silicon multi-element alloy powder, the additive and the defoaming agent in the continuous stirring process until the slurry is uniform, adding the binder, the corrosion inhibitor, the thickening agent and the rest water into the uniform slurry, and uniformly mixing to obtain the anticorrosive primer.

In the following embodiments, after each layer of primer is not sprayed, the primer is firstly dried for about 10min at the temperature of 105 ℃, then solidified and sintered for about 25min at the temperature of 280 ℃, naturally cooled after solidification, and subjected to secondary coating, drying and sintering after the primer is completely cooled to the room temperature.

The intermediate paint used in each of the following examples was a micaceous iron oxide intermediate paint.

The finish used in each of the following examples was a fluorocarbon finish;

the fiber mesh cloth adopted in the following embodiments is alkali-free glass fiber mesh cloth, and the mass of the alkali-free glass fiber mesh cloth is 30-50 g/m²The square mesh has a size of 3-5 mm and a thickness of about 10 μm. In the following examples, the intermediate paint and the top paint were applied and cured in a natural curing manner after each application.

Example 1

An anti-corrosion treatment method for a steel structure iron tower resistant to marine climate comprises the following steps:

firstly, sequentially carrying out oil removal, rust removal and dehumidification treatment on the surface of a steel structure;

wherein the rust removal adopts sand blasting rust removal or mechanical polishing rust removal, and the rust removal is performed until St2 grade, and the surface roughness Rz70um is achieved; preheating the surface of the steel structure at the preheating temperature of about 100 ℃; dehumidifying the surface of the steel structure;

secondly, spraying an anticorrosive primer on the surface of the steel structure, and curing to form a primer layer;

wherein, the spraying of the primer is carried out for three layers, each layer is sprayed once and is about 20 mu m thick, and each layer is dried after being sprayed to form the primer layer;

spraying a layer of intermediate paint on the surface of the primer layer, covering a layer of fiber mesh cloth in the spraying process, bonding the fiber mesh cloth on the surface of the primer layer by using the layer of intermediate paint, curing, continuously spraying two layers of intermediate paint on the surface of the fiber mesh cloth, and curing to form an intermediate paint layer;

wherein, a spraying and coating net device is adopted, and a layer of fiber mesh cloth is coated when the intermediate paint is sprayed, as shown in figure 1, the method specifically comprises the following steps:

the method comprises the following steps that a fiber mesh cloth 3 wound on a fiber mesh cloth roller 2 is wound on the end portion of an outer ring, drawn out and penetrates through the bottom of a press roller 1, the fiber mesh cloth is pressed to be tightly attached to the surface of a primer layer by the press roller 1, meanwhile, a guide roller 10 is attached to the surface of the primer layer, the press roller 1 is driven to roll forwards while the guide roller 10 rolls forwards, intermediate paint is sprayed to the surface of the primer layer by a paint nozzle 4 while the guide roller 10 rolls forwards, the fiber mesh cloth is pressed on the surface of the primer layer by the rolling press roller 1, and the fiber mesh cloth is bonded on the surface of the primer layer under the action of primer;

the thickness of each sprayed intermediate paint layer is about 40 mu m;

in this embodiment, the fiber mesh cloth is an alkali-free glass fiber mesh cloth with a mass of 40g/m²The size of the square mesh is 4 mm;

and finally, spraying two layers of finish paint on the surface of the intermediate paint layer, wherein the total thickness is about 40 mu m, and finishing the anticorrosion treatment of the steel structure iron tower.

The coating obtained on the surface of the steel structure by the anticorrosion treatment method provided in example 1 has a bonding force of 0 grade measured by a cross-hatch method, the thickness of the coating is about 240 μm, and the salt spray test is over 3000 hours.

Example 2

An anti-corrosion treatment method for a steel structure iron tower resistant to marine climate comprises the following steps:

firstly, sequentially carrying out oil removal, rust removal and dehumidification treatment on the surface of a steel structure;

wherein the rust removal adopts sand blasting rust removal or mechanical polishing rust removal, and the rust removal is performed until St2 grade, and the surface roughness Rz70um is achieved; preheating the surface of the steel structure at the preheating temperature of about 100 ℃; dehumidifying the surface of the steel structure;

secondly, spraying an anticorrosive primer on the surface of the steel structure, and curing to form a primer layer;

wherein, the spraying of the primer is carried out for three layers, each layer is sprayed once and is about 20 mu m thick, and each layer is dried after being sprayed to form the primer layer;

spraying a layer of intermediate paint on the surface of the primer layer, covering a layer of fiber mesh cloth in the spraying process, bonding the fiber mesh cloth on the surface of the primer layer by using the layer of intermediate paint, curing, continuously spraying two layers of intermediate paint on the surface of the fiber mesh cloth, and curing to form an intermediate paint layer;

wherein, a spraying and coating net device is adopted, and a layer of fiber mesh cloth is coated when the intermediate paint is sprayed, as shown in figure 1, the method specifically comprises the following steps:

the fiber mesh cloth wound on the fiber mesh cloth roller 2 is drawn out from the end part wound on the outer ring and penetrates through the bottom of the compression roller 1, the fiber mesh cloth is pressed to be tightly attached to the surface of a primer layer by the compression roller 1, the guide roller 10 is attached to the surface of a steel structure, the compression roller 1 is driven to roll forwards while the guide roller 10 rolls forwards, intermediate paint is sprayed to the surface of the primer layer by the paint nozzle 4 while the guide roller 10 rolls forwards, the fiber mesh cloth is pressed on the surface of the primer layer by the rolling compression roller 1, and the fiber mesh cloth is bonded on the surface of the primer layer under the action of the primer.

The thickness of each sprayed intermediate paint layer is about 40 mu m;

in the embodiment, the fiber mesh cloth is alkali-free glass fiber mesh cloth, and the mass of the alkali-free glass fiber mesh cloth is 30g/m²The size of the square mesh is 4 mm;

and finally, spraying two layers of finish paint on the surface of the intermediate paint layer, wherein the total thickness is about 40 mu m, and finishing the anticorrosion treatment of the steel structure iron tower.

The coating obtained by the anticorrosion treatment method provided in example 1 on the surface of the steel structure has a bonding force of 0 grade by a cross-hatch method, the coating thickness is about 240 mu m, and the salt spray test exceeds 3100 h.

Example 3

An anti-corrosion treatment method for a steel structure iron tower resistant to marine climate comprises the following steps:

firstly, sequentially carrying out oil removal, rust removal and dehumidification treatment on the surface of a steel structure;

wherein the rust removal adopts sand blasting rust removal or mechanical polishing rust removal, and the rust removal is performed until St2 grade, and the surface roughness Rz70um is achieved; preheating the surface of the steel structure at the preheating temperature of about 100 ℃; dehumidifying the surface of the steel structure;

secondly, spraying an anticorrosive primer on the surface of the steel structure, and curing to form a primer layer;

wherein, four layers are sprayed when the primer is sprayed, each layer is sprayed once and is about 20 mu m thick, and each layer is dried after being sprayed to form the primer layer;

spraying a layer of intermediate paint on the surface of the primer layer, covering a layer of fiber mesh cloth in the spraying process, bonding the fiber mesh cloth on the surface of the primer layer by using the layer of intermediate paint, curing, continuously spraying three layers of intermediate paint on the surface of the fiber mesh cloth, and curing to form an intermediate paint layer;

wherein, a spraying and coating net device is adopted, and a layer of fiber mesh cloth is coated when the intermediate paint is sprayed, as shown in figure 1, the method specifically comprises the following steps:

the method comprises the following steps of (1) taking out the fiber mesh cloth wound on a fiber mesh cloth roller 2 from the end part of an outer ring, enabling the fiber mesh cloth to penetrate through the bottom of a press roller 1, pressing the fiber mesh cloth to be tightly attached to the surface of a primer layer by using the press roller 1, simultaneously attaching a guide roller 10 to the surface of the primer layer, driving the press roller 1 to roll forwards while the guide roller 10 rolls forwards, spraying intermediate paint to the surface of the primer layer by using a paint nozzle 4 while the guide roller 10 rolls forwards, pressing the fiber mesh cloth on the surface of the primer layer by using the rolling press roller 1, and bonding the fiber mesh cloth on the surface of the primer layer under the action of primer;

the thickness of each sprayed intermediate paint layer is about 40 mu m;

the fiber mesh cloth adopted by the embodiment is alkali-free glass fiber mesh cloth, and the mass of the alkali-free glass fiber mesh cloth is 50g/m²The size of the square mesh is 3 mm;

and finally, spraying two layers of finish paint on the surface of the intermediate paint layer, wherein the total thickness is about 40 mu m, and finishing the anticorrosion treatment of the steel structure iron tower.

The coating obtained on the surface of the steel structure by the anticorrosion treatment method provided in example 2 has a bonding force of 0 grade measured by a cross-hatch method, the thickness of the coating is about 290 mu m, and the salt spray test is over 3500 h.

In conclusion, according to the anticorrosion treatment method for the steel structure iron tower resistant to marine climate provided by the invention, the fiber mesh cloth is laid between the primer and the intermediate paint, and the corrosion-resistant, wear-resistant, erosion-resistant and weather-resistant composite coating is formed on the surface of the steel structure, so that the cracking of the anticorrosion primer layer caused by the action of the external environment is avoided, the overall cracking resistance of the whole anticorrosion coating can be effectively improved, and the protection of the steel structure by the anticorrosion coating is enhanced.

The fiber mesh cloth wound on the fiber mesh cloth roller is drawn out from the end part of the outer ring and penetrates through the bottom of the compression roller through the spraying mesh device, the fiber mesh cloth rolls forwards through the guide roller, meanwhile, the coating nozzle is used for spraying the intermediate paint to the surface of the primer layer, the fiber mesh cloth is pressed on the surface of the primer layer through the rolling compression roller, the fiber mesh cloth is bonded on the surface of the primer layer under the action of the intermediate paint, the fiber mesh cloth is effectively pressed on the surface of the primer layer, and a large amount of intermediate paint is filled between the fiber mesh cloth and the primer layer and between the fiber mesh cloth and the self mesh, so that the fiber mesh cloth is bonded on the surface of the primer layer under the action of the intermediate paint, and the efficiency of spraying the intermediate paint and laying the fiber mesh cloth is greatly improved. In addition, the fiber mesh cloth adopted by the invention is alkali-free glass fiber mesh cloth and has stronger bonding force with the epoxy micaceous iron oxide intermediate paint, so that the fiber mesh cloth has stronger bonding force between the intermediate paint and the primer layer, thereby further improving the overall anti-cracking performance of the coating.

According to the invention, the fiber mesh cloth is laid between the primer and the intermediate paint, so that a concave-convex surface can be formed between the primer layer and the intermediate paint layer, the overall performance of the intermediate paint layer can be effectively enhanced, and meanwhile, under the action of the fiber mesh cloth, the cracking of the intermediate paint layer and the surface layer caused by severe environment is avoided, and the cracking of the anticorrosion primer layer caused by the cracking of the intermediate paint layer is also avoided; in addition, the fiber mesh cloth used in the invention is alkali-free glass fiber mesh cloth, and has strong bonding performance with the epoxy micaceous iron oxide intermediate paint, the fiber mesh cloth not only provides a skeleton integrally attached to the surface of the primer layer for the intermediate paint layer, but also plays a role in preventing cracking of the primer layer, thereby effectively improving the integral cracking resistance of the composite coating, and greatly prolonging the corrosion resistance life of the steel structure by at least more than 20 years.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.