Anti-corrosion steel pipe

Abstract

The utility model discloses an anti-corrosion steel pipe which comprises a steel pipe body (1), and an inner anti-corrosion layer (2) is arranged on the inner wall face of the steel pipe body (1). An outer anti-corrosion layer (3) is arranged on the outer wall surface of the steel pipe (1); the composite material is characterized in that the outer anti-corrosion layer (3) comprises an epoxy asphalt paint coating (3-1), a glass fiber cloth winding layer (3-2), an adhesive coating (3-3) and a polyethylene belt winding layer (3-4) which are sequentially arranged from inside to outside. According to the utility model, the construction process is simpler, the production cycle is shortened, the outermost wall surface is smoother, the friction and scratch during installation and transportation can be reduced or avoided, and the outer anticorrosive coating has advantages in the aspects of performance indexes and parameters, so that the product quality can be integrally improved.

Description

Technical Field

[0001] The utility model relates to an anti-corrosion steel pipe. Background Art

[0002] Three-cloth and four-oil anti-corrosion steel pipe refers to an anti-corrosion treatment method in which the steel pipe is coated with oil four times and wrapped with cloth three times. Specifically, four layers of anti-corrosion oil (usually epoxy asphalt paint, i.e. epoxy asphalt paint coating) are applied to the outer wall of the steel pipe, and three layers of anti-corrosion cloth (i.e. fiberglass cloth winding layer) are wrapped around to form an effective outer anti-corrosion layer. The construction process of the outer anti-corrosion layer is as follows: steel pipe surface treatment--coating the first layer of anti-corrosion oil--laying the first layer of anti-corrosion cloth--coating the second layer of anti-corrosion oil--laying the second layer of anti-corrosion cloth--laying the second layer of fiberglass cloth--coating the third layer of anti-corrosion oil--laying the third layer of fiberglass cloth--coating the fourth layer of anti-corrosion oil. The inner anti-corrosion layer of the steel pipe is coated with epoxy powder (i.e. epoxy powder coating).

[0003] The three-cloth and four-oil anti-corrosion steel pipe is a steel pipe treated with a special anti-corrosion process, which is mainly used to improve the corrosion resistance of the outer layer of the steel pipe and extend its service life. However, in actual production and use, the following deficiencies have been found:

[0004] First, in actual application, since it requires four times of oiling and three times of winding and laying, the construction process is complicated and the production cycle is long;

[0005] Second, since the outer wall of the three-cloth and four-oil anti-corrosion steel pipe is a fourth layer of anti-corrosion oil (epoxy asphalt paint), the surface is not smooth enough and is easily scraped off by friction during installation and transportation. Utility Model Content

[0006] The utility model provides an anti-corrosion steel pipe, which can solve one or more technical problems raised in the above background technology.

[0007] In order to achieve the above-mentioned purpose, the solution of the utility model is: an anti-corrosion steel pipe, including a steel pipe, the inner wall surface of the steel pipe is provided with an inner anti-corrosion layer; the outer wall surface of the steel pipe is provided with an outer anti-corrosion layer; it is characterized in that: the outer anti-corrosion layer includes an epoxy asphalt paint coating, a glass fiber cloth winding layer, an adhesive coating and a polyethylene tape winding layer arranged in sequence from the inside to the outside.

[0008] Preferably, the inner anti-corrosion layer is an epoxy powder coating with a thickness of 0.35-0.5 mm on the inner wall.

[0009] Preferably, the steel pipe is made of Q235 steel or Q345 steel.

[0010] Preferably, the epoxy asphalt paint coating has a thickness of 0.15-0.25 mm.

[0011] Preferably, the thickness of the glass fiber cloth winding layer is 0.2-0.3 mm.

[0012] Preferably, the adhesive coating has a thickness of 0.17-0.25 mm.

[0013] Preferably, the polyethylene tape wrapping layer has a thickness of 1.5 mm to 3 mm.

[0014] Beneficial effects of the utility model:

[0015] First, the utility model only needs two coatings and two layings during the construction of the external anti-corrosion layer, and can be constructed at room temperature; the process is simpler than the existing process, and the production is shortened by at least 1 / 3;

[0016] Second, the outermost layer of the anti-corrosion layer of the utility model is a glass fiber cloth winding layer. Compared with the existing outermost layer of epoxy asphalt coating, the surface of this product is smoother, which can reduce or avoid friction scratches during installation and transportation;

[0017] Third, the utility model has excellent chemical corrosion resistance and cathodic stripping resistance because the epoxy asphalt paint coating bottom layer forms a continuous coating film and is directly bonded to the outer surface of the steel pipe. It can also react with the active groups of the glass fiber cloth and the intermediate layer adhesive to form a chemical bond, ensuring that the overall anti-corrosion layer has good adhesion at higher temperatures. The glass fiber cloth improves the adhesion between the polyethylene tape winding layer and the epoxy asphalt paint coating, which can increase the crack resistance, strength, firmness and moisture resistance of the outer anti-corrosion layer, and prevent the polyethylene tape winding layer from peeling, water seepage and other phenomena. The addition of glass fiber cloth enhances the mechanical strength of the anti-corrosion layer and improves the stability of the overall structure.

[0018] Fourth, the polyethylene tape wrapping layer of the utility model mainly plays a role in mechanical protection and anti-corrosion. The polyethylene tape wrapping layer has an excellent barrier effect against moisture and can protect the epoxy asphalt paint coating, the glass fiber cloth wrapping layer and the adhesive coating. It has strong resistance to mechanical damage and reduces peeling, providing the entire outer anti-rust layer with good impact resistance, very low water permeability and good temperature resistance.

[0019] Fifth, compared with the existing three-cloth and four-oil anti-corrosion steel pipe, the outer anti-corrosion layer of the utility model has better comprehensive performance such as peeling strength, crack resistance, adhesion, impact strength, moisture resistance, and permeability;

[0020] Sixth, compared with the existing three-cloth and four-oil anti-corrosion steel pipe, the outer anti-corrosion layer of the utility model has excellent performance in electrical insulation, water permeability resistance, heat resistance, and high temperature resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a cross-sectional view of an anti-corrosion steel pipe in the utility model.

[0022] Figure 2 yes Figure 1 Put the picture at A in the middle.

[0023] Figure 3 This is a real picture of an anti-corrosion steel pipe in the utility model. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] Example: See Figure 1-3 A corrosion-resistant steel pipe comprises a steel pipe 1, wherein the inner wall surface of the steel pipe 1 is provided with an inner corrosion-resistant layer 2; the outer wall surface of the steel pipe 1 is provided with an outer corrosion-resistant layer 3; and the characteristic is that the outer corrosion-resistant layer 3 comprises an epoxy asphalt paint coating 3-1, a glass fiber cloth winding layer 3-2, an adhesive coating 3-3 and a polyethylene tape winding layer 3-4 which are arranged in sequence from the inside to the outside.

[0026] The construction process of the outer anti-rust layer of the anti-corrosion steel pipe is:

[0027] S10. Clean and treat the outer wall of the steel pipe to ensure that there is no debris, oil stains, or loose parts on the surface, thus completing the pretreatment of the outer wall of the steel pipe;

[0028] S20, applying a layer of epoxy asphalt on the outer wall of the steel pipe, and ensuring that the coating is evenly covered on the outer wall of the steel pipe, thereby obtaining an epoxy asphalt paint coating;

[0029] S30, before the epoxy asphalt dries, wrapping a layer of glass fiber cloth, and compacting the glass fiber cloth with a roller or a brush to ensure that the glass fiber cloth and the epoxy asphalt are tightly bonded; thereby obtaining a glass fiber cloth wrapping layer 3-2;

[0030] S40, applying another layer of adhesive on the glass fiber cloth, also ensuring that the adhesive is evenly covered; thereby obtaining an adhesive coating of 3-3;

[0031] S50, before the adhesive is dry, wrap a layer of polyethylene tape, and compact the glass fiber cloth with a roller or a brush to ensure that the glass fiber cloth and the adhesive are tightly bonded; thereby obtaining 3-4 polyethylene tape wrapping layers.

[0032] It should be noted that the construction process of the inner anti-rust layer of the anti-corrosion steel pipe is as follows: an epoxy powder coating can be sprayed onto the inner wall surface of the steel pipe 1 by electrostatic spraying, thereby forming the inner anti-corrosion layer 2. Since the electrostatic spraying method used for the inner anti-rust layer 2 in this embodiment belongs to the prior art, it will not be described in detail.

[0033] Preferably, the inner anti-corrosion layer 2 is an epoxy powder coating with a thickness of 0.35-0.5 mm. In this embodiment, the thickness is 0.4 mm.

[0034] Preferably, the steel pipe 1 is made of Q235 steel or Q345 steel. In this embodiment, Q235 steel is selected, with a nominal diameter of DN200mm and a customizable length.

[0035] Preferably, the epoxy asphalt paint coating 3-1 has a thickness of 0.15-0.25 mm. In this embodiment, the thickness is 0.2 mm.

[0036] Preferably, the glass fiber cloth winding layer 3-2 has a thickness of 0.2-0.3 mm. In this embodiment, the thickness is 0.25 mm.

[0037] Preferably, the adhesive coating 3-3 has a thickness of 0.17-0.25 mm. In this embodiment, the thickness is 0.2 mm.

[0038] Specifically, the adhesive coating 3 - 3 can be made of epoxy resin adhesive (ie epoxy resin adhesive containing a curing agent), polyurethane adhesive, organic silicone, acrylic adhesive, etc.

[0039] In this embodiment, the adhesive coating 3-3 is made of epoxy resin adhesive.

[0040] Preferably, the polyethylene tape wrapping layer 3-4 has a thickness of 1.5 mm to 3 mm. In this embodiment, the thickness is 2 mm.

[0041] After testing, some performance indicators of the anti-corrosion steel pipe of this embodiment are shown in Table 1 below:

[0042]

[0043] The anti-corrosion steel pipe of this embodiment has the following advantages and is analyzed as follows:

[0044] (1) In the construction of the external anti-corrosion layer, this embodiment only requires two coatings and two layings, and can be constructed at room temperature. The process is simpler than the existing process, and the production is shortened by at least 1 / 3;

[0045] (2) In this embodiment, the outermost layer of the outer anti-corrosion layer is a glass fiber cloth winding layer. Compared with the existing outermost layer of epoxy asphalt coating, the surface is smoother, which can reduce or avoid friction scratches during installation and transportation;

[0046] (3) In this embodiment, the bottom layer of the epoxy asphalt paint coating 3-1 forms a continuous coating film, which is directly bonded to the outer surface of the steel pipe and has good chemical corrosion resistance and cathodic stripping resistance. It reacts with the active groups of the glass fiber cloth and the intermediate layer adhesive to form a chemical bond, ensuring that the overall anti-corrosion layer has good adhesion at higher temperatures. The glass fiber cloth improves the adhesion between the polyethylene tape winding layer 3-4 and the epoxy asphalt paint coating 3-1 after combination, which can increase the crack resistance, strength, firmness and moisture resistance of the outer anti-corrosion layer, and also prevent the polyethylene tape winding layer from peeling, water seepage and other phenomena. The addition of glass fiber cloth enhances the mechanical strength of the anti-corrosion layer and improves the stability of the overall structure.

[0047] (4) The polyethylene tape wrapping layer 3-4 of this embodiment primarily serves as a mechanical protection and anti-corrosion agent. The polyethylene tape wrapping layer 3-4 has an excellent barrier effect against moisture, protecting the epoxy asphalt paint coating 3-1, the glass fiber cloth wrapping layer 3-2, and the adhesive coating 3-3. It has strong resistance to mechanical damage, reduces peeling, and provides the entire outer anti-rust layer with good impact resistance, very low water permeability, and good temperature resistance. Furthermore, it also has excellent resistance to environmental stress cracking.

[0048] (5) Compared with the existing three-cloth and four-oil anti-corrosion steel pipe, the product of this embodiment has better comprehensive performance such as peeling strength, crack resistance, adhesion, impact strength, moisture resistance, and permeability of the outer anti-corrosion layer;

[0049] (6) Compared with the existing three-cloth and four-oil anti-corrosion steel pipes, the product of this embodiment has excellent performance in terms of electrical insulation, water permeability resistance, heat resistance, and high temperature resistance of the outer anti-corrosion layer.

[0050] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. An anti-corrosion steel pipe, comprising a steel pipe (1), wherein the inner wall surface of the steel pipe (1) is provided with an inner anti-corrosion layer (2); and the outer wall surface of the steel pipe (1) is provided with an outer anti-corrosion layer (3); characterized in that: The outer anti-corrosion layer (3) comprises an epoxy asphalt paint coating (3-1), a glass fiber cloth winding layer (3-2), an adhesive coating (3-3) and a polyethylene tape winding layer (3-4) which are arranged in sequence from the inside to the outside.

2. The anti-corrosion steel pipe according to claim 1, characterized in that: The inner anti-corrosion layer (2) is an epoxy powder coating with a thickness of 0.35-0.5 mm.

3. The anti-corrosion steel pipe according to claim 1, characterized in that: The steel pipe (1) is made of Q235 steel or Q345 steel.

4. The anti-corrosion steel pipe according to claim 1, characterized in that: The thickness of the epoxy asphalt paint coating (3-1) is 0.15-0.25 mm.

5. The anti-corrosion steel pipe according to claim 1, characterized in that: The thickness of the glass fiber cloth winding layer (3-2) is 0.2-0.3 mm.

6. The anti-corrosion steel pipe according to claim 1, characterized in that: The thickness of the adhesive coating (3-3) is 0.17-0.25 mm.

7. The anti-corrosion steel pipe according to claim 1, characterized in that: The thickness of the polyethylene tape wrapping layer (3-4) is 1.5 mm to 3 mm.

Images