Multilayer composite corrosion-resistant copper pipe

Abstract

The utility model provides a kind of multilayer composite corrosion -resistant copper pipe belongs to corrosion -resistant copper pipe technical field, it is mainly aimed at the problem that existing copper pipe is easily corroded and copper pipe strength is often insufficient after increasing corrosion -resistant layer, the following technical scheme is proposed, including copper pipe matrix, copper pipe matrix periphery is provided with corrosion -resistant layer, corrosion -resistant layer periphery is provided with protective layer, corrosion -resistant layer includes porous slow-release layer and galvanized layer, a plurality of groups of filling holes are provided on porous slow-release layer, a plurality of groups of filling holes are evenly arranged on porous slow-release layer, a plurality of groups of filling holes are filled with corrosion inhibitor, a plurality of groups of reinforcing ribs are provided on porous slow-release layer, porous slow-release layer continuously releases corrosion inhibitor and actively inhibits corrosion, galvanized layer provides electrochemical protection by preferential corrosion, prolongs the service life of the copper pipe, reinforcing rib improves structural strength, protective layer resists physical damage, improves overall structural strength and mechanical durability, adapts to complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of corrosion-resistant copper pipe technology, and more specifically, to a multi-layer composite corrosion-resistant copper pipe. Background Technology

[0002] Copper pipes have long been a key material for fluid transport in refrigeration and air conditioning systems, building water supply and drainage, ship pipelines, heat exchangers and chemical equipment due to their excellent thermal conductivity, processability and certain corrosion resistance. However, existing copper pipes are easily corroded and the strength of copper pipes is often insufficient after adding a corrosion-resistant layer.

[0003] On the one hand, in many practical application scenarios, especially in harsh environments with corrosive media, the corrosion resistance of traditional copper pipes is often insufficient to cope with actual use. For example, in cooling systems with marine climates or direct contact with seawater, high concentrations of chloride ions can easily induce pitting and crevice corrosion in copper pipes. In industrial environments, media containing sulfides, ammonia, or weak acidic substances may cause stress corrosion cracking or uniform corrosion in copper pipes. These forms of corrosion not only cause the copper pipe wall thickness to decrease and strength to drop, eventually leading to perforation and leakage, affecting the safe operation of the system, but the corrosion products they produce may also block pipelines, contaminate fluids, significantly reduce heat exchange efficiency, and bring expensive equipment maintenance and replacement costs as well as potential environmental risks.

[0004] On the other hand, applying an additional corrosion-resistant protective layer to the surface of the copper tube substrate can effectively improve the corrosion resistance of the copper tube. Common protective layers include organic polymer coatings, metal plating or ceramic coatings. However, after adding a protective layer, the strength of copper tubes with the same wall thickness often decreases.

[0005] Therefore, existing copper pipes need improvement in terms of corrosion resistance and strength after compositing. Utility Model Content

[0006] In view of the aforementioned problems, and in conjunction with the first aspect of this utility model, the embodiments of this utility model provide a multi-layer composite corrosion-resistant copper tube, achieved by the following specific technical means:

[0007] A multi-layer composite corrosion-resistant copper pipe includes a copper pipe substrate, a corrosion-resistant layer disposed around the copper pipe substrate, and a protective layer disposed around the corrosion-resistant layer.

[0008] The corrosion-resistant layer includes a porous slow-release layer and a zinc plating layer;

[0009] The porous slow-release layer is provided with multiple sets of filling holes, which are evenly arranged on the porous slow-release layer. Each set of filling holes is filled with corrosion inhibitor. The porous slow-release layer is provided with multiple sets of reinforcing ribs.

[0010] According to a preferred embodiment, the plurality of filling pores all penetrate the porous sustained-release layer along a direction perpendicular to the porous sustained-release layer.

[0011] According to a preferred embodiment, multiple sets of reinforcing ribs are distributed at intervals around the porous slow-release layer, and all sets of reinforcing ribs penetrate the porous slow-release layer along the tube direction.

[0012] According to a preferred embodiment, the periphery of the porous slow-release layer is bonded to the galvanized layer, and the periphery of the galvanized layer is bonded to the protective layer.

[0013] According to a preferred embodiment, the porous slow-release layer is made of ordered mesoporous SiO2 material, and the protective layer is made of micro-arc oxidized Al2O3 ceramic material.

[0014] According to a preferred embodiment, the copper tube substrate has a wall thickness of 2mm-2.1mm.

[0015] Based on the above aspects, this utility model has the following beneficial effects:

[0016] Firstly, the multi-layered structure of the multi-layered composite corrosion-resistant copper tube enhances its overall corrosion resistance. The porous slow-release layer coats the copper tube substrate, and the corrosion inhibitor filled in the porous slow-release layer can be continuously and slowly released to the outer wall of the copper tube substrate through the evenly distributed filling pores on the porous slow-release layer, actively inhibiting the corrosion reaction on the copper tube surface and providing long-lasting chemical protection. At the same time, the zinc plating layer, which is closely attached to the porous slow-release layer, corrodes preferentially before copper through the cathodic protection principle of sacrificial anode, thus forming a passive electrochemical protection for the copper tube substrate. The synergistic effect of active slow-release protection and passive sacrificial anode protection constitutes a dual and complementary protective barrier, improving the copper tube's tolerance and service life in various harsh corrosive environments.

[0017] Secondly, the multiple sets of reinforcing ribs running along the tube direction on the porous slow-release layer provide a crucial internal support network for the relatively fragile porous material. These spaced reinforcing ribs greatly improve the structural rigidity and resistance to pressure and bending of the porous slow-release layer, preventing it from cracking or deforming due to external forces during use, and ensuring the stability and structural integrity of the corrosion inhibitor release channel. On the other hand, the outermost protective layer itself has high hardness, good wear resistance and impact resistance, serving not only as a physical barrier against chemical corrosion but also directly resisting external physical damage. The reinforcement of the inner porous layer by the reinforcing ribs, combined with the outer hard ceramic protection, jointly improves the overall structural strength, dimensional stability and resistance to external mechanical stress of the composite copper tube, enabling it to adapt to more complex and demanding application scenarios. Attached Figure Description

[0018] Figure 1This is a schematic diagram of the structure of a multi-layer composite corrosion-resistant copper tube provided in an embodiment of the present invention;

[0019] Figure 2 This is an exploded view of a multi-layer composite corrosion-resistant copper tube provided in an embodiment of this utility model;

[0020] Figure 3 yes Figure 2 Enlarged view of region a in the middle;

[0021] Figure 4 This is a cross-sectional view of a multi-layer composite corrosion-resistant copper tube provided in an embodiment of this utility model.

[0022] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0023] 100. Copper tube substrate; 101. Protective layer; 102. Porous slow-release layer; 103. Galvanized layer; 104. Filler hole; 105. Reinforcing rib. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings. Figure 1 This is a schematic diagram of the structure of a multi-layer composite corrosion-resistant copper tube provided in an embodiment of this utility model. Figure 2 This is an exploded view of a multi-layer composite corrosion-resistant copper tube provided in an embodiment of this utility model. Figure 3 yes Figure 2 Enlarged view of region a in the middle. Figure 4 This is a cross-sectional view of a multi-layer composite corrosion-resistant copper pipe provided in an embodiment of this utility model. The following is a detailed description of this multi-layer composite corrosion-resistant copper pipe.

[0025] A multi-layer composite corrosion-resistant copper pipe has a core component of a copper pipe substrate 100 with a wall thickness between 2mm and 2.1mm. This thickness range allows the copper pipe to maintain good flexibility while possessing a certain load-bearing capacity, making it suitable for various application scenarios. A corrosion-resistant layer is provided around the copper pipe substrate 100, providing basic corrosion protection for the copper pipe. A protective layer 101 is provided around the corrosion-resistant layer, further enhancing the protective performance of the copper pipe and resisting external environmental erosion and physical damage.

[0026] The corrosion-resistant layer is composed of a porous slow-release layer 102 and a zinc plating layer 103. These two layers work together to improve the corrosion resistance of the copper tube.

[0027] The porous slow-release layer 102 plays an active protective role in the entire corrosion-resistant layer. Multiple sets of filling pores 104 are uniformly arranged on the porous slow-release layer 102, and each set of filling pores 104 is filled with a corrosion inhibitor. The corrosion inhibitor can be a scale-inhibiting corrosion inhibitor, which has excellent corrosion inhibition performance on carbon steel, copper, and copper alloys, and scale-dispersing properties on calcium carbonate and calcium phosphate. When the user uses the copper pipe, the corrosion inhibitor filled in the porous slow-release layer 102 can be continuously and slowly released to the outer wall of the copper pipe substrate 100 through these uniformly distributed filling pores 104. This slow release method can form a stable protective film on the surface of the copper pipe, actively inhibiting the corrosion reaction on the copper pipe surface and providing long-term chemical protection for the copper pipe. In addition, multiple sets of reinforcing ribs 105 are also provided on the porous slow-release layer 102, which provide support for the porous slow-release layer 102.

[0028] Multiple sets of filling holes 104 penetrate the porous slow-release layer 102 along the direction perpendicular to the porous slow-release layer 102, ensuring a smooth path for the release of the corrosion inhibitor and ensuring that the corrosion inhibitor can reach the surface of the copper tube smoothly and play its protective role.

[0029] Multiple sets of reinforcing ribs 105 are spaced apart around the porous slow-release layer 102. All sets of reinforcing ribs 105 penetrate the porous slow-release layer 102 along the tube body direction. Since the porous slow-release layer 102 is relatively fragile, the spaced reinforcing ribs 105 form an internal support network. In actual use, the reinforcing ribs 105 improve the structural rigidity and resistance to compression and bending of the porous slow-release layer 102, effectively preventing the porous slow-release layer 102 from cracking or deforming when subjected to external forces. This ensures the stability and structural integrity of the corrosion inhibitor release channel and ensures the continuous effectiveness of the chemical protection function.

[0030] The porous slow-release layer 102 is closely attached to the galvanized layer 103. Through the cathodic protection principle of sacrificial anode, the galvanized layer 103 will preferentially corrode before copper, thus concentrating the corrosion on itself, thereby forming a passive electrochemical protection for the copper tube substrate 100, effectively protecting the copper tube substrate 100 and reducing the risk of corrosion.

[0031] Understandably, when the protective layer is worn away, the zinc plating layer 103 is exposed to the corrosive medium. Since the standard electrode potential of zinc is significantly lower than that of copper, when the two are in the corrosive medium, zinc, as the anode, will spontaneously undergo an oxidation reaction and continuously release electrons; while the copper tube substrate with a higher potential becomes the cathode, accepting electrons and undergoing a reduction reaction, thereby avoiding the oxidation and corrosion of copper itself.

[0032] The galvanized layer 103 is bonded to the protective layer 101 on its periphery. The protective layer 101 is the outermost layer of the entire copper tube structure. The protective layer 101 itself has high hardness and can withstand certain external impacts; it has good wear resistance and is not easily damaged by friction during long-term use; it also has good impact resistance and can effectively cope with collisions that may occur in the external environment. The protective layer 101 not only serves as a physical barrier against chemical corrosion, preventing corrosive substances from directly contacting the internal structure, but also directly resists external physical damage.

[0033] The porous slow-release layer 102 is made of ordered mesoporous SiO2 material, which can well accommodate corrosion inhibitors and achieve stable release of corrosion inhibitors. The zinc in the zinc plating layer 103 can more stably play the role of sacrificial anode and improve the effect of electrochemical protection. The protective layer 101 is made of micro-arc oxidation Al2O3 ceramic material, which has good protective performance and provides an outer layer of protection for copper tubes.

[0034] It should be noted that the ordered mesoporous SiO2 material has a highly regular and uniform nanoscale pore network, which can provide ideal accommodation space and diffusion path for various corrosion inhibitor molecules, allowing the corrosion inhibitor molecules to be released slowly and persistently to the surface of the copper tube substrate. The micro-arc oxidized Al2O3 ceramic material has a Mohs hardness of 9, which has good resistance to mechanical damage and prevents damage to the internal structure of the tube. In addition, the micro-arc oxidized Al2O3 ceramic material has high chemical inertness, which can effectively prevent the intrusion of external corrosive media.

[0035] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. A and B can be singular or plural. Additionally, the character " / " in this article generally indicates an "or" relationship between the preceding and following related objects, but it can also represent an "and / or" relationship. Please refer to the context for a more accurate understanding.

[0036] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A multi-layer composite corrosion-resistant copper pipe, comprising a copper pipe substrate (100), characterized in that: A corrosion-resistant layer is provided around the copper tube substrate (100), and a protective layer (101) is provided around the corrosion-resistant layer; The corrosion-resistant layer includes a porous slow-release layer (102) and a zinc plating layer (103); The porous slow-release layer (102) is provided with a plurality of sets of filling holes (104), the plurality of sets of filling holes (104) are evenly arranged on the porous slow-release layer (102), the plurality of sets of filling holes (104) are filled with corrosion inhibitors, and the porous slow-release layer (102) is provided with a plurality of sets of reinforcing ribs (105).

2. The multi-layer composite corrosion-resistant copper tube as described in claim 1, characterized in that: Multiple sets of filling pores (104) penetrate the porous sustained-release layer (102) along a direction perpendicular to the porous sustained-release layer (102).

3. The multi-layer composite corrosion-resistant copper tube as described in claim 2, characterized in that: Multiple sets of reinforcing ribs (105) are spaced apart around the porous slow-release layer (102), and all sets of reinforcing ribs (105) penetrate the porous slow-release layer (102) along the direction of the copper tube substrate (100).

4. The multi-layer composite corrosion-resistant copper tube as described in claim 1, characterized in that: The porous slow-release layer (102) is bonded to the galvanized layer (103) on its periphery, and the galvanized layer (103) is bonded to the protective layer (101) on its periphery.

5. The multi-layer composite corrosion-resistant copper tube as described in claim 1, characterized in that: The porous slow-release layer (102) is made of ordered mesoporous SiO2 material, and the protective layer (101) is made of micro-arc oxidized Al2O3 ceramic material.

6. The multi-layer composite corrosion-resistant copper tube as described in claim 1, characterized in that: The copper tube substrate (100) has a wall thickness of 2mm-2.1mm.

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