Three-layer polyethylene anti-corrosion stainless steel pipe

Abstract

The utility model discloses a three-layer polyethylene anticorrosion stainless steel pipe, which comprises a stainless steel pipe, a bottom layer, a middle layer, an outer layer and an inner coating, the bottom layer is fixed on the surface of the stainless steel pipe, the middle layer is fixed on the surface of the bottom layer, the outer layer is fixed on the surface of the middle layer, and the inner coating is arranged inside the stainless steel pipe; the bottom layer is coated on the surface of the stainless steel pipe and is made of a polyethylene coating material. The corrosion-resistant stainless steel pipe has the advantage of being good in corrosion-resistant effect, and the problem that the stainless steel pipe still possibly has local corrosion phenomena such as pitting corrosion and crevice corrosion in some extreme environments such as high-salinity seawater and strong acid and alkali environments is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to stainless steel pipe technical field, concretely is a three layer polyethylene anticorrosive stainless steel pipe. BACKGROUND

[0002] Three layer polyethylene anticorrosive stainless steel pipe is a kind of high-performance anticorrosive pipeline widely used in petroleum, natural gas transportation and underground pipeline engineering, and the core purpose of its design and application is to solve the corrosion problem of pipeline under complex working conditions, prolong service life, reduce maintenance cost and ensure safe operation.

[0003] In petroleum, natural gas transportation and underground pipeline engineering, conveying pipeline needs to be used, underground soil contains moisture, salt, microorganism and other corrosive substances, which can easily cause electrochemical corrosion to metal pipeline, and the medium conveyed in the pipeline is corrosive, especially the fluid containing hydrogen sulfide, carbon dioxide or acidic substance, therefore, a three layer polyethylene anticorrosive stainless steel pipe is needed. UTILITY MODEL CONTENT

[0004] The utility model discloses a three layer polyethylene anticorrosive stainless steel pipe, which has the advantages of good corrosion resistance, solves the problem of local corrosion, such as pitting and crevice corrosion, of stainless steel pipe in some extreme environments, such as high salinity seawater and strong acid and alkali environment.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a three layer polyethylene anticorrosive stainless steel pipe, comprising a stainless steel pipe, a bottom layer, an intermediate layer, an outer layer and an inner coating,

[0006] The bottom layer is fixed on the surface of the stainless steel pipe, the intermediate layer is fixed on the surface of the bottom layer, and the outer layer is fixed on the surface of the intermediate layer.

[0007] The bottom layer is coated on the surface of the stainless steel pipe, and the bottom layer is made of polyethylene coating material.

[0008] The intermediate layer is fixed on the side opposite to the bottom layer and the outer layer, and the intermediate layer is a polyethylene copolymer adhesive.

[0009] The outer layer comprises a protective layer and an anticorrosive layer.

[0010] As a preferred three layer polyethylene anticorrosive stainless steel pipe of the utility model, the thickness of the polyethylene copolymer adhesive is 0.2-0.35mm.

[0011] As a kind of three-layer polyethylene anticorrosive stainless steel pipe preferred of the utility model, the protective layer is fixed on the surface of the intermediate layer, the protective layer is polyethylene protective layer, the polyethylene protective layer adopts high-density polyethylene or medium-density polyethylene material, the thickness of the protective layer is 1.5-3.5 millimeters.

[0012] As a kind of three-layer polyethylene anticorrosive stainless steel pipe preferred of the utility model, the inner coating layer adopts epoxy resin or ceramic coating layer, the thickness of the inner coating layer is 0.2-0.3 millimeters.

[0013] As a kind of three-layer polyethylene anticorrosive stainless steel pipe preferred of the utility model, the anticorrosive layer is coated on the surface of the protective layer, the anticorrosive layer is hydrophobic and oleophobic coating, the hydrophobic and oleophobic coating is nanocomposite material, the thickness of the anticorrosive layer is 0.1-0.2 millimeters.

[0014] Compared with prior art, the utility model has the advantages that:

[0015] 1, the bottom layer of the utility model adopts polyethylene coating, it provides preliminary protective barrier, can effectively resist the invasion of moisture, oxygen and other corrosive substances, the chemical stability and water resistance of polyethylene make it become excellent anticorrosive material, the intermediate layer adopts polyethylene copolymer adhesive, not only strengthens the integrity of the whole coating system, but also ensures the firm combination between bottom layer and outer layer, polyethylene copolymer adhesive prevents the peeling or delamination phenomenon of coating caused by environmental stress or mechanical action by providing good adhesion, thereby maintaining long-term anticorrosive protection, the protective layer is made of high-density or medium-density polyethylene, provides additional physical protection, including wear resistance, impact resistance and weather resistance etc., so that stainless steel pipe can be used for long time in harsh environment without damage. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is the utility model structure perspective view;

[0017] Fig. 2 It is the utility model structure front view;

[0018] Fig. 3 It is the utility model outer layer structure diagram.

[0019] In the drawing: 1, stainless steel pipe;2, bottom layer;3, intermediate layer;4, outer layer;41, protective layer;42, anticorrosive layer;5, inner coating layer. DETAILED DESCRIPTION

[0020] Please refer to Figs. 1-3The utility model provides a kind of three-layer polyethylene anticorrosive stainless steel pipe, including stainless steel pipe 1, bottom layer 2, intermediate layer 3, outer layer 4 and inner coating 5, bottom layer 2 is fixed on the surface of stainless steel pipe 1, intermediate layer 3 is fixed on the surface of bottom layer 2, outer layer 4 is fixed on the surface of intermediate layer 3, inner coating 5 is arranged in the inside of stainless steel pipe 1, inner coating 5 is arranged in the inside of stainless steel pipe 1.

[0021] Further, bottom layer 2 is coated on the surface of stainless steel pipe 1, and bottom layer 2 is made of polyethylene coating material.

[0022] Further, intermediate layer 3 is fixed on the side opposite to bottom layer 2 and outer layer 4, and intermediate layer 3 is polyethylene copolymer adhesive.

[0023] Further, the thickness of polyethylene copolymer adhesive is 0.2-0.35mm.

[0024] Further, outer layer 4 includes protective layer 41 and anticorrosion layer 42.

[0025] Further, protective layer 41 is fixed on the surface of intermediate layer 3, and protective layer 41 is polyethylene protective layer made of high-density polyethylene or medium-density polyethylene material, and the thickness of protective layer 41 is 1.5-3.5mm.

[0026] Further, anticorrosion layer 42 is coated on the surface of protective layer 41, and anticorrosion layer is hydrophobic and oleophobic coating, and the hydrophobic and oleophobic coating is nanocomposite material, and the thickness of anticorrosion layer 42 is 0.1-0.2mm.

[0027] Further, the polyethylene protective layer is composite structure, including first polyethylene protective layer on the inner side, ceramic fiber reinforcing layer in the middle and second polyethylene protective layer on the outer side, so as to improve the overall use strength of polyethylene protective layer through the three-layer composite structure.

[0028] Further, inner coating 5 is made of epoxy resin or ceramic coating, and the thickness of inner coating 5 is 0.2-0.3mm.

[0029] Bottom layer 2 is made of polyethylene coating, which provides a preliminary protective barrier to effectively resist the intrusion of moisture, oxygen and other corrosive substances, and the chemical stability and water resistance of polyethylene make it an excellent anticorrosive material.

[0030] Intermediate layer 3 is made of polyethylene copolymer adhesive, which not only enhances the integrity of the entire coating system, but also ensures the firm combination between bottom layer 2 and outer layer 4, and the polyethylene copolymer adhesive prevents coating peeling or delamination phenomenon caused by environmental stress or mechanical action through providing good adhesion, so as to maintain long-term anticorrosive protection.

[0031] The protective layer 41 is made of high density or medium density polyethylene, which provides additional physical protection, including wear resistance, impact resistance and weather resistance, so that the stainless steel pipe 1 can be used in harsh environments for a long time without being damaged, and the anticorrosive layer 42 uses a hydrophobic and oleophobic coating of a nano composite material as the outermost layer, which further improves the resistance of the pipe to external corrosion factors. This special coating can effectively prevent water and oil from adhering to the surface of the pipe, reducing the possibility of corrosion.

[0032] The inner coating 5 is made of epoxy resin or ceramic coating, which can protect the inside of the stainless steel pipe from corrosion of the conveying medium. The epoxy resin or ceramic coating has excellent chemical resistance and wear resistance, and is suitable for various fluid transmission systems.

[0033] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A three-layer polyethylene anticorrosive stainless steel pipe, characterized by, The utility model relates to a stainless steel pipe anticorrosion layer, including stainless steel pipe (1), bottom layer (2), intermediate layer (3), outer layer (4) and inner coating (5), The bottom layer (2) is fixed on the surface of the stainless steel pipe (1), the intermediate layer (3) is fixed on the surface of the bottom layer (2), the outer layer (4) is fixed on the surface of the intermediate layer (3), and the inner coating (5) is arranged in the stainless steel pipe (1); The bottom layer (2) is coated on the surface of the stainless steel pipe (1), and the bottom layer (2) is made of polyethylene coating material; The intermediate layer (3) is fixed on the opposite side of the bottom layer (2) and the outer layer (4), and the intermediate layer (3) is a polyethylene copolymer adhesive; The outer layer (4) includes a protective layer (41) and a corrosion-resistant layer (42).

2. A three layer polyethylene anticorrosive stainless steel pipe as claimed in claim 1, wherein: The thickness of the polyethylene copolymer adhesive is 0.2-0.35 mm.

3. A three layer polyethylene anticorrosive stainless steel pipe as claimed in claim 1, wherein: The protective layer (41) is fixed on the surface of the intermediate layer (3), the protective layer (41) is a polyethylene protective layer, the polyethylene protective layer is made of high-density polyethylene or medium-density polyethylene material, and the thickness of the protective layer (41) is 1.5-3.5 mm.

4. A three layer polyethylene anticorrosive stainless steel pipe as claimed in claim 1, wherein: The inner coating (5) is made of epoxy resin or ceramic coating, and the thickness of the inner coating (5) is 0.2-0.3 mm.

5. A three layer polyethylene anticorrosive stainless steel pipe as claimed in claim 3, wherein: The corrosion-resistant layer (42) is coated on the surface of the protective layer (41), the corrosion-resistant layer is a hydrophobic and oleophobic coating, the hydrophobic and oleophobic coating is a nanocomposite material, and the thickness of the corrosion-resistant layer (42) is 0.1-0.2 mm.

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