High-corrosion-resistance composite stainless steel pipe

Abstract

The utility model relates to a high-corrosion-resistance composite stainless steel pipe which comprises an inner pipe, a reinforcing net is arranged on the outer surface of the inner pipe, an alloy layer is arranged on the inner surface of the inner pipe, an adhesion layer is arranged on the outer surface of the reinforcing net, an outer pipe is arranged on the outer surface of the adhesion layer, and the adhesion layer is a nanometer anti-corrosion layer. By arranging the alloy layer and the polishing layer, the corrosion resistance and stability of the inner pipe in a reducing medium are improved, the adhesiveness of the inner pipe is reduced, and the corrosion resistance is further improved; by arranging the nanometer anti-corrosion layer, a microscopic protective barrier can be formed when the pipeline is corroded, and further invasion of a corrosion medium is prevented; and by arranging the passivation layer and the corrosion-resistant layer, corrosion of oxygen, moisture, acid-base substances and the like in the external environment to the pipeline is effectively resisted, and the service life of the stainless steel pipe is prolonged.

Description

Technical Field

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

[0002] Stainless steel pipes are widely used in construction, chemical industry, food processing, and many other fields due to their excellent strength and corrosion resistance. However, in some harsh corrosive environments, such as those containing strong acids, strong alkalis, or high salinity, the corrosion resistance of ordinary stainless steel pipes often fails to meet the requirements of long-term use, easily leading to corrosion perforation and other problems. This not only affects the service life of the pipeline but may also cause leakage of the transported medium, resulting in safety hazards and economic losses. Currently, there are some stainless steel pipes on the market with corrosion resistance, but the corrosion-resistant structure of some products is relatively simple, making it difficult to effectively resist the combined effects of multiple corrosive factors. In addition, the bonding between the layers of some composite stainless steel pipes is not tight enough, which can easily lead to delamination during long-term use, reducing the overall performance of the pipeline. Therefore, we have designed a highly corrosion-resistant composite stainless steel pipe.

[0003] Chinese utility model patent CN202322973475.6 discloses a corrosion-resistant stainless steel pipe, relating to the field of stainless steel pipe technology. The application includes a steel pipe body with a buffer layer on its outer surface. The buffer layer comprises an inner pipe and an outer pipe, with an annular cavity between the inner and outer pipes. A buffer pipe is disposed within the annular cavity, and the buffer pipe has a corrugated longitudinal section with its corrugated ends connected to both the inner and outer pipes. An inner liner is provided on the inner wall of the steel pipe body, and a reinforcing layer is provided between the inner liner and the steel pipe body. This application utilizes the inner and outer pipes on the outer wall of the steel pipe body, with the corrugated longitudinal section between the inner and outer pipes... The constructed buffer pipe is used to buffer the pressure applied to the steel pipe body from the outside, avoiding the pressure from acting directly and rigidly on the steel pipe body, and ensuring the internal transmission capacity of the steel pipe body. The inner lining pipe and the reinforcing layer are set to strengthen and support the steel pipe body, thereby improving the pressure resistance of the steel pipe body. However, this utility model has the following problems: First, it does not have the corrosion resistance to strong acids, strong alkalis and high salinity. When transporting media containing strong acids, strong alkalis and high salinity, the corrosion resistance of ordinary stainless steel pipes is often difficult to meet the requirements of long-term use. Second, it does not have good adhesion. The bonding between the layers of the composite stainless steel pipe is not tight enough, and delamination is prone to occur during long-term use, which reduces the overall performance of the pipeline. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by setting alloy layers, polishing layers, nano-anti-corrosion layers, passivation layers, and corrosion-resistant layers. This solves the technical problems of poor corrosion resistance of composite stainless steel pipes to media containing strong acids, strong alkalis, and high salinity, insufficient bonding between the layers of composite stainless steel pipes, and easy delamination during long-term use, which reduces the overall performance of the pipeline.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A high corrosion-resistant composite stainless steel pipe includes an inner pipe, the outer surface of which is provided with a reinforcing mesh, and the inner surface of which is provided with an alloy layer. The outer surface of the reinforcing mesh is provided with an adhesive layer, and the outer surface of the adhesive layer is provided with an outer pipe. The adhesive layer is a nano-anti-corrosion layer.

[0007] As a preferred embodiment, the outer surface of the inner tube is uniformly distributed with grooves, and the alloy layer is a molybdenum-nickel alloy layer.

[0008] As a preferred embodiment, the inner surface of the alloy layer is provided with a polished layer, and the surface roughness of the polished layer is not greater than 0.2 micrometers.

[0009] As a preferred embodiment, the reinforcing mesh includes vertical strips adapted to connecting grooves, and the surface of the vertical strips is uniformly distributed with circular rings located on the outer surface of the inner tube.

[0010] As a preferred embodiment, the outer surface of the outer tube is provided with a passivation layer, and the outer surface of the passivation layer is provided with a corrosion-resistant layer.

[0011] The beneficial effects of this utility model are:

[0012] (1) In this utility model, by setting an alloy layer and a polishing layer, the molybdenum element in the molybdenum-nickel alloy layer can improve the corrosion resistance of stainless steel in reducing media, while the nickel element can enhance the stability of the passivation film of stainless steel, thereby improving the overall corrosion resistance of the inner tube; while the polishing layer can reduce the friction between the medium and the inner wall of the inner tube, reduce the scouring corrosion of the inner wall when the medium flows in the pipe, and also make it less likely for impurities to adhere, further improving the corrosion resistance.

[0013] (2) In this utility model, a nano-anti-corrosion layer is set up. The adhesive, composed of nano zinc oxide and high-performance epoxy resin, has good adhesion and chemical corrosion resistance. It is uniformly coated on the outer surface of the inner tube and the reinforcing mesh through a special coating process, so that the inner tube and the outer tube are tightly bonded together. Furthermore, nano zinc oxide can form a micro-protective barrier when the pipeline is corroded, preventing further intrusion of corrosive media and increasing corrosion resistance.

[0014] (3) In this utility model, by setting a passivation layer and a corrosion resistant layer, the outer surface of the outer tube undergoes a special passivation treatment to form a dense passivation film, which is the passivation layer, which can effectively resist the corrosion of the pipe by oxygen, moisture, acid and alkali substances in the external environment; while the corrosion resistant layer is a fluorocarbon coating, which can prevent the outer tube surface from being corroded by ultraviolet rays, acid rain, oil stains, etc., and extend the service life of the stainless steel pipe.

[0015] In summary, this utility model has the advantages of high corrosion resistance and high adhesion, and is especially suitable for the field of stainless steel pipe technology. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a high corrosion-resistant composite stainless steel pipe.

[0018] Figure 2 A structural diagram of the reinforced mesh section.

[0019] Figure 3 This is a schematic diagram of the outer tube section. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0021] Example 1

[0022] like Figures 1 to 3 As shown, this utility model provides a high corrosion-resistant composite stainless steel pipe, including an inner pipe 1 made of stainless steel. The outer surface of the inner pipe 1 is provided with a reinforcing mesh 2, which serves to strengthen it and prevent it from deforming under pressure. The internal transmission capacity remains unchanged, thereby improving the service life of the inner pipe 1. The inner surface of the inner pipe 1 is provided with an alloy layer 3, and the outer surface of the reinforcing mesh 2 is provided with an adhesive layer 4. The outer surface of the adhesive layer 4 is provided with an outer pipe 5 made of stainless steel. The adhesive layer 4 is a nano-anti-corrosion layer, which is an adhesive composed of nano zinc oxide and high-performance epoxy resin. It has good adhesion and chemical corrosion resistance. It is uniformly coated on the outer surface of the inner pipe 1 and the reinforcing mesh 2 through a special coating process, so that the inner pipe 1 and the outer pipe 5 are tightly bonded together. Furthermore, the nano zinc oxide can form a microscopic protective barrier when the pipe is corroded, preventing further intrusion of corrosive media and increasing corrosion resistance.

[0023] Furthermore, such as Figure 1 As shown, grooves 11 are evenly distributed on the outer surface of the inner tube 1. The alloy layer 3 is a molybdenum-nickel alloy layer. The molybdenum element in the molybdenum-nickel alloy layer can improve the corrosion resistance of stainless steel in reducing media, while the nickel element can enhance the stability of the passivation film of stainless steel, thereby improving the overall corrosion resistance of the inner tube.

[0024] Furthermore, such as Figure 2 As shown, the inner surface of the alloy layer 3 is provided with a polished layer 31. The surface roughness of the polished layer 31 is no more than 0.2 micrometers. The mirror polishing treatment forms a polished layer, which can reduce the friction between the medium and the inner wall of the inner tube 1, reduce the scouring and corrosion of the inner wall by the medium when it flows in the pipe, and also make it less likely for impurities to adhere, further improving the corrosion resistance.

[0025] Furthermore, the reinforcing mesh 2 includes vertical strips 21, which improve the connectivity between several rings 22, thereby enhancing the overall strength, hardness, and toughness of the inner tube 1 and effectively improving its compressive strength. This makes the inner tube 1 less prone to bending or breaking during use, effectively extending its service life. The vertical strips 21 are adapted to the connecting grooves 11, increasing the contact area between the reinforcing mesh 2 and the inner tube 1, making the connection between the two tighter. The surface of the vertical strips 21 is evenly distributed with rings 22, which are located on the outer surface of the inner tube 1 to improve the inner tube 1's resistance to bending and folding.

[0026] Furthermore, such as Figure 3 As shown, the outer surface of the outer tube 5 is provided with a passivation layer 51. The outer surface of the outer tube 1 undergoes a special passivation treatment to form a dense passivation film, namely the passivation layer 51, which can effectively resist the corrosion of the pipe by oxygen, moisture, acid and alkali substances in the external environment. The outer surface of the passivation layer 51 is provided with a corrosion-resistant layer 52, which is a fluorocarbon coating. The fluorocarbon coating has excellent weather resistance, chemical corrosion resistance and self-cleaning properties, which can prevent the outer tube surface from being corroded by ultraviolet rays, acid rain, oil stains, etc., and extend the service life of the stainless steel pipe.

[0027] Working process: When the composite stainless steel pipe is used to transport media, the inner pipe 1 effectively resists the corrosion of the media by means of the alloy layer 3 and polished layer 31 on the inner wall; furthermore, the nano zinc oxide in the adhesive layer 4 forms a microscopic protective barrier, further preventing the intrusion of corrosive media; furthermore, the passivation layer 51 and corrosion-resistant layer 52 of the outer pipe 5 jointly protect the pipeline from the erosion of the external environment; at the same time, the bonding effect of the adhesive layer 4 ensures the tight connection between the inner pipe 1 and the outer pipe 5, ensuring the overall performance of the pipeline.

[0028] In the description of this utility model, it should be understood that the terms "front and back", "left and right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0029] Of course, those skilled in the art should understand that the term "a" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be understood as a limitation on the quantity.

[0030] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art under the technical guidance of this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A high corrosion-resistant composite stainless steel pipe, characterized in that: The device includes an inner tube (1), the outer surface of which is provided with a reinforcing mesh (2), and the inner surface of which is provided with an alloy layer (3). The outer surface of the reinforcing mesh (2) is provided with an adhesive layer (4), and the outer surface of the adhesive layer (4) is provided with an outer tube (5). The adhesive layer (4) is a nano-anti-corrosion layer. The outer surface of the inner tube (1) is uniformly distributed with grooves (11). The alloy layer (3) is a molybdenum-nickel alloy layer. The inner surface of the alloy layer (3) is provided with a polishing layer (31), and the surface roughness of the polishing layer (31) is not greater than 0.2 micrometers.

2. The high corrosion-resistant composite stainless steel pipe according to claim 1, characterized in that, The reinforcing mesh (2) includes vertical strips (21), which are adapted to connect grooves (11), and circular rings (22) are evenly distributed on the surface of the vertical strips (21), which are located on the outer surface of the inner tube (1).

3. The high corrosion-resistant composite stainless steel pipe according to claim 1, characterized in that, The outer surface of the outer tube (5) is provided with a passivation layer (51), and the outer surface of the passivation layer (51) is provided with a corrosion resistant layer (52).

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