Composite stainless steel pipe with corrosion resistant layer

Abstract

The utility model relates to stainless steel pipe technical field discloses a kind of composite stainless steel pipes with corrosion-resistant layer, including steel pipe body, the outer surface of steel pipe body is connected with outer covering layer, the utility model outer covering layer's polyethylene material and passivation film's chromate component jointly act, effectively resist the erosion of external corrosive substance, even if outer covering layer is slightly damaged, passivation film can still continue protection, avoid corrosive substance direct contact steel pipe body, composite layer's glass fiber reinforced plastics not only enhanced the mechanical strength and deformation resistance of pipeline, further improved corrosion resistance, prevent corrosive substance penetration outer covering layer to cause corrosion to steel pipe body, the epoxy resin coating of inner lining effectively protects steel pipe inner wall, prevents the corrosion of internal medium to steel pipe, simultaneously play sealing effect, avoid medium leakage, multilayer structure not only prolongs the service life of pipeline, reduces maintenance cost, also improves the security and reliability of pipeline.

Description

Technical Field

[0001] This utility model relates to the field of stainless steel pipe technology, and in particular to a composite stainless steel pipe with a corrosion-resistant layer. Background Technology

[0002] Stainless steel pipes are widely used in construction, chemical, petroleum, food processing and other fields. They are favored for their good mechanical properties and corrosion resistance. Their high strength, good toughness and excellent corrosion resistance enable them to maintain stable performance in a variety of harsh environments, making them an indispensable material in modern industry and construction.

[0003] However, in actual use, stainless steel pipes still face many corrosion challenges, especially in complex industrial environments where pipes need to be in contact with various corrosive media for a long time, such as acids, alkalis, salt solutions, and humid air. These media will accelerate the corrosion rate of stainless steel, leading to thinning of the pipe wall, reduction in strength, and even leakage accidents. For example, in the chemical industry, the chemical media transported are often highly corrosive, such as sulfuric acid and hydrochloric acid. These acidic solutions will quickly erode the stainless steel surface, forming local corrosion points, which will then expand into large-area corrosion areas. In the petroleum industry, pipes are exposed to humid air for a long time, which can easily lead to electrochemical corrosion, resulting in uneven thinning of the pipe wall, ultimately affecting the pipe's pressure-bearing capacity and sealing performance. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a composite stainless steel pipe with a corrosion-resistant layer.

[0005] This utility model is achieved by the following technical solution: a composite stainless steel pipe with a corrosion-resistant layer, comprising a steel pipe body, an outer coating layer fixedly connected to the outer surface of the steel pipe body, a composite layer fixedly connected to the surface of the outer coating layer, a passivation film provided on the outer surface of the steel pipe body, and an inner lining layer fixedly connected to the inner wall of the steel pipe body.

[0006] Through the above technical solution, the polyethylene material of the outer cladding and the chromate component of the passivation film work together to effectively resist the erosion of external corrosive substances. Even if the outer cladding is slightly damaged, the passivation film can still provide continuous protection, preventing corrosive substances from directly contacting the steel pipe body. The glass fiber reinforced plastic of the composite layer not only enhances the mechanical strength and deformation resistance of the pipe, but also further improves its corrosion resistance, preventing corrosive substances from penetrating the outer cladding and causing corrosion to the steel pipe body. The epoxy resin coating of the inner lining layer effectively protects the inner wall of the steel pipe, preventing the internal medium from corroding the steel pipe, and at the same time plays a sealing role to prevent medium leakage. The multi-layer structure not only extends the service life of the pipeline and reduces maintenance costs, but also improves the safety and reliability of the pipeline.

[0007] As a further improvement to the above solution, the outer coating is made of polyethylene and is in contact with the passivation film.

[0008] The above technical solutions not only enhance the corrosion resistance of stainless steel pipes, enabling them to adapt to harsher external environments, but also further improve the protective effect through the outer coating and passivation film, thereby improving the overall quality and reliability of stainless steel pipes.

[0009] As a further improvement to the above solution, the composite layer is made of glass fiber reinforced plastic and is disposed on the outer surface of the outer covering layer.

[0010] Through the above technical solution, glass fiber reinforced plastic, as the material of the composite layer, not only improves the mechanical properties of stainless steel pipe, enabling it to withstand greater pressure and external forces, but also further enhances its corrosion resistance, making stainless steel pipe more advantageous under complex working conditions.

[0011] As a further improvement to the above solution, the passivation film is made of chromate passivation film.

[0012] Through the above technical solutions, the chromate passivation film can significantly improve the corrosion resistance of stainless steel pipe surface, effectively prevent metal oxidation and corrosion, and extend the service life of stainless steel pipe.

[0013] As a further improvement to the above solution, the inner lining layer is made of epoxy resin coating.

[0014] Through the above technical solution, the epoxy resin coating, as the material of the inner lining, can effectively protect the inner wall of the steel pipe from corrosion by the internal medium, ensure the long-term stable operation of the pipeline, improve the pipeline's transportation efficiency and safety, and reduce the risk of leakage caused by internal wall corrosion.

[0015] As a further improvement to the above solution, the steel pipe body is made of alloy steel.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The polyethylene material of the outer cladding and the chromate component of the passivation film work together to effectively resist the erosion of external corrosive substances. Even if the outer cladding is slightly damaged, the passivation film can still provide continuous protection, preventing corrosive substances from directly contacting the steel pipe body. The glass fiber reinforced plastic of the composite layer not only enhances the mechanical strength and deformation resistance of the pipe, but also further improves its corrosion resistance, preventing corrosive substances from penetrating the outer cladding and causing corrosion to the steel pipe body. The epoxy resin coating of the inner lining layer effectively protects the inner wall of the steel pipe, preventing the internal medium from corroding the steel pipe, and at the same time plays a sealing role to prevent medium leakage. The multi-layer structure not only extends the service life of the pipeline and reduces maintenance costs, but also improves the safety and reliability of the pipeline. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the composite layer structure of this utility model; Figure 3 This is a schematic diagram of the structure of the inner lining layer of this utility model; Figure 4 This utility model Figure 3 A magnified structural diagram of point A in the middle.

[0018] Explanation of key symbols: 1. Steel pipe body; 2. Outer cladding layer; 3. Composite layer; 4. Passivation film; 5. Inner lining layer. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0020] Example: Please combine Figure 1-4 This embodiment of a composite stainless steel pipe with a corrosion-resistant layer includes a steel pipe body 1, an outer cladding layer 2 fixedly connected to the outer surface of the steel pipe body 1, a composite layer 3 fixedly connected to the surface of the outer cladding layer 2, a passivation film 4 provided on the outer surface of the steel pipe body 1, and an inner lining layer 5 fixedly connected to the inner wall of the steel pipe body 1. The composite stainless steel pipe is based on the steel pipe body 1, with the outer cladding layer 2 fixedly connected to its outer surface, and the composite layer 3 fixedly connected to the surface of the outer cladding layer 2. Simultaneously, the passivation film 4 is provided on the outer surface of the steel pipe body 1, and the inner lining layer 5 is fixedly connected to the inner wall. This multi-layered structure provides effective protection. The outer cladding layer 2 and the composite layer 3 together provide external protection for the steel pipe body 1, preventing external corrosive substances from directly contacting the steel pipe. The passivation film 4 further enhances the corrosion resistance of the surface of the steel pipe body 1. The inner lining layer 5 protects the inner wall of the steel pipe, preventing corrosion of the steel pipe by the internal medium.

[0021] The outer cladding layer 2 is made of polyethylene. The outer cladding layer 2 is in contact with the passivation film 4. Polyethylene is a material with good chemical stability and corrosion resistance, which can effectively resist the erosion of corrosive substances such as acids, alkalis and salts in the external environment. At the same time, the contact between polyethylene and the passivation film 4 further enhances the protective effect. The passivation film 4 itself has a certain corrosion resistance. The two work together to provide more reliable external protection for the steel pipe body 1.

[0022] The composite layer 3 is made of glass fiber reinforced plastic and is set on the outer surface of the outer cladding layer 2. Glass fiber reinforced plastic has excellent properties such as high strength, high modulus, wear resistance, and corrosion resistance. Its high strength and high modulus properties can provide additional mechanical support for the stainless steel pipe, enhancing the overall strength and deformation resistance of the pipe. At the same time, its corrosion resistance further improves the corrosion resistance of the stainless steel pipe, preventing external corrosive substances from penetrating the outer cladding layer 2 and causing corrosion to the steel pipe body 1.

[0023] The passivation film 4 is made of chromate passivation film. Chromate passivation film forms a dense oxide film on the metal surface, which effectively prevents the metal from contacting external corrosive substances, thus playing a good anti-corrosion role.

[0024] The inner lining layer 5 is made of epoxy resin coating. Epoxy resin coating has good chemical stability and adhesion, and can firmly adhere to the inner wall of the steel pipe to form a uniform and dense protective film. It can effectively prevent internal media, such as water, acid and alkali, from corroding the inner wall of the steel pipe. At the same time, it can also play a certain sealing role to prevent media leakage and ensure the normal transportation function of the pipeline.

[0025] The material of the steel pipe body 1 is alloy steel.

[0026] The implementation principle of a composite stainless steel pipe with a corrosion-resistant layer in this embodiment is as follows: When the composite stainless steel pipe is corroded, firstly, the polyethylene material of the outer coating layer 2 has good chemical stability and corrosion resistance, effectively resisting the erosion of corrosive substances such as acids, alkalis, and salts in the external environment. When corrosive substances come into contact with the outer coating layer 2, the polyethylene will prevent these substances from penetrating further, thereby protecting the internal structure from being affected. At the same time, the outer coating layer 2 is in close contact with the passivation film 4, and the chromate component of the passivation film 4 will form a dense oxide film on the metal surface, further enhancing the corrosion resistance. This dual protection mechanism ensures that even with the outer coating layer... Even if layer 2 is slightly damaged, the passivation film 4 can still continue to function, preventing corrosive substances from directly contacting the steel pipe body 1. The composite layer 3 is located on the outer surface of the outer cladding layer 2. Its glass fiber reinforced plastic material not only has high strength and high modulus characteristics, which can provide additional mechanical support for the pipeline, enhance the overall strength and resistance to deformation, but also has excellent corrosion resistance. Inside the pipeline, the epoxy resin coating of the inner lining layer 5 is firmly attached to the inner wall of the steel pipe, forming a protective film. When internal media, such as water, acid, alkali, etc., pass through the pipeline, the inner lining layer 5 can effectively prevent these media from corroding the inner wall of the steel pipe, and at the same time play a sealing role to prevent media leakage.

[0027] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A composite stainless steel pipe with a corrosion-resistant layer, characterized in that, The steel pipe body (1) includes an outer cladding (2) fixedly connected to the outer surface of the steel pipe body (1), a composite layer (3) fixedly connected to the surface of the outer cladding (2), a passivation film (4) provided on the outer surface of the steel pipe body (1), and an inner lining layer (5) fixedly connected to the inner wall of the steel pipe body (1).

2. The composite stainless steel pipe with a corrosion-resistant layer as described in claim 1, characterized in that: The outer coating (2) is made of polyethylene and is in contact with the passivation film (4).

3. The composite stainless steel pipe with a corrosion-resistant layer as described in claim 1, characterized in that: The composite layer (3) is made of glass fiber reinforced plastic and is disposed on the outer surface of the outer cover layer (2).

4. A composite stainless steel pipe with a corrosion-resistant layer as described in claim 1, characterized in that: The passivation film (4) is made of chromate passivation film.

5. A composite stainless steel pipe with a corrosion-resistant layer as described in claim 1, characterized in that: The inner lining layer (5) is made of epoxy resin coating.

6. A composite stainless steel pipe with a corrosion-resistant layer as described in claim 1, characterized in that: The steel pipe body (1) is made of alloy steel.

Images