Seamless aluminum alloy pipe with good corrosion resistance

Abstract

The utility model belongs to the technical field of aluminum alloy pipes, and particularly relates to a seamless aluminum alloy pipe with good corrosion resistance, which comprises a base layer, an inner protective layer arranged on the inner side of the base layer, a passivation layer arranged on the outer side of the base layer, a barrier layer arranged on the outer side of the passivation layer, and an outer protective layer arranged on the outer side of the barrier layer. And an outer protection layer is arranged on the outer side of the outer protection layer. According to the seamless aluminum alloy pipe, the corrosion resistance of the seamless aluminum alloy pipe is remarkably improved through a multi-layer protection structure. The inner protective layer (fluorocarbon), the passivation layer (aluminum oxide), the barrier layer (zirconium oxide), the outer protective layer (acrylic acid) and the outer protective layer (titanium carbide) act together to form a complete protective barrier, and corrosion of corrosive substances such as acid and alkali can be effectively resisted. Especially in an extreme environment, the pipe has longer service life and better corrosion resistance.

Description

TECHNICAL FIELD

[0001] The utility model relates to aluminium alloy pipe technical field, concretely is a kind of seamless aluminium alloy pipe with good corrosion resistance. BACKGROUND

[0002] Seamless aluminium alloy pipe is a tubular product made of aluminium alloy material, made by extrusion or stretching process, with high strength, good corrosion resistance and lighter weight. Seamless aluminium alloy pipe is usually used in aerospace, automobile manufacturing, chemical industry, construction and other industries, as it does not need welded joints, avoiding the weak points that may occur at the joints, making the pipe more stable and reliable. This aluminium alloy pipe has no weld in the production process, with high uniformity and precision, can withstand high internal and external pressure. Its common alloy components include aluminium-copper, aluminium-manganese, aluminium-silicon, etc., through different alloy formulations, different mechanical properties and application requirements can be realized. The surface of seamless aluminium alloy pipe can be oxidized to improve its durability and aesthetics, and is widely used in aviation, automobile and mechanical manufacturing fields.

[0003] However, in actual use scenarios, the corrosion resistance of seamless aluminium alloy pipe may not be satisfactory, which significantly affects its service life. In certain specific environments, such as industrial environments containing acid and alkali substances or coastal areas with high humidity and high salinity, the aluminium alloy pipe may gradually expose the aluminium matrix and suffer corrosion due to wear of protective coating or damage of passivation layer. As corrosion intensifies, the structural strength and integrity of the pipe are compromised, making it more prone to problems during normal use and unable to fully perform its intended functions, ultimately reducing its service life. SUMMARY

[0004] The utility model discloses a kind of seamless aluminium alloy pipes with good corrosion resistance, solve the problem that seamless aluminium alloy pipe is not satisfactory in corrosion resistance when using, easily lead to the service life reduction of seamless aluminium alloy pipe.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of seamless aluminium alloy pipe with good corrosion resistance, including base layer, the inner side of the base layer is provided with inner protective layer, the outer side of the base layer is provided with passivation layer, the outer side of the passivation layer is provided with barrier layer, the outer side of the barrier layer is provided with outer protective layer, the outer side of the outer protective layer is provided with outer protective layer, the material of the base layer is aluminium alloy, the material of the inner protective layer is fluorocarbon, the material of the passivation layer is aluminium oxide, the material of the barrier layer is zirconium oxide, the material of the outer protective layer is acrylic acid, the material of the outer protective layer is titanium carbide.

[0006] Preferably, the thickness of the base layer is 3mm, and the base layer is designed to serve as the base of the pipe, to bear internal pressure and external load, and to provide basic strength and rigidity support for the entire pipe.

[0007] Preferably, the thickness of the inner protective layer is 1mm, and the inner protective layer is designed to effectively isolate the internal medium from contacting the aluminum alloy base.

[0008] Preferably, the thickness of the passivation layer is 1mm, and the passivation layer is designed to further enhance the corrosion resistance of the base layer, to prevent external corrosive medium from further penetrating into the base layer, and to play an isolating and protective role.

[0009] Preferably, the thickness of the barrier layer is 1mm, and the barrier layer is designed to serve as an additional protective barrier to prevent corrosive medium from diffusing to the base layer through the tiny defects or grain boundaries of the passivation layer, thereby improving the overall corrosion resistance of the pipe.

[0010] Preferably, the thickness of the outer protective layer is 1mm, and the outer protective layer is designed to protect the outer surface of the pipe from direct erosion of the external environment, thereby prolonging the service life of the pipe. At the same time, the outer protective layer can also provide a certain decorative effect, making the appearance of the pipe more beautiful.

[0011] Preferably, the thickness of the outer protective layer is 1mm, and the outer protective layer is designed to provide additional protection against physical damage and chemical corrosion from the external environment during transportation, installation and use, thereby further improving the corrosion resistance and service life of the pipe.

[0012] Compared with the prior art, the utility model has the beneficial effects as follows:

[0013] 1. The seamless aluminum alloy pipe of the utility model significantly improves the corrosion resistance through the multi-layer protective structure. The inner protective layer (fluorocarbon), the passivation layer (aluminum oxide), the barrier layer (zirconium oxide), the outer protective layer (acrylic acid) and the outer protective layer (titanium carbide) jointly form a complete protective barrier, which can effectively resist the corrosion of corrosive substances such as acid and alkali. In particular, in extreme environments, the pipe has a longer service life and better corrosion resistance.

[0014] 2. The seamless aluminum alloy pipe of the utility model adopts a multi-layer composite material structure, each layer of material has different functions and properties, which can enhance the overall mechanical properties and durability. The base layer aluminum alloy provides basic strength and toughness, while the passivation layer, the barrier layer, the outer protective layer and the outer protective layer provide additional protection. In particular, the application of the outer protective layer (titanium carbide) greatly improves the surface hardness of the pipe, further improving its mechanical properties such as scratch resistance and impact resistance. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The overall structure perspective view of the present application;

[0016] Figure 2 The overall structure perspective view of the present application; Figure 1 The side view of the present application.

[0017] In the figure: 1, base layer; 2, inner protective layer; 3, passivation layer; 4, blocking layer; 5, outer protective layer; 6, outer protective layer. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] Please refer to Figures 1-2 A seamless aluminum alloy pipe with good corrosion resistance comprises a base layer 1, the material of the base layer 1 is aluminum alloy, the thickness of the base layer 1 is 3 mm, through the design of the base layer 1, the base layer 1 serves as the basis of the pipe material, bears internal pressure and external load, and provides basic strength and rigid support for the entire pipe material, the inner side of the base layer 1 is provided with an inner protective layer 2, the material of the inner protective layer 2 is fluorocarbon, the thickness of the inner protective layer 2 is 1 mm, through the design of the inner protective layer 2, the contact between the internal medium and the aluminum alloy base body can be effectively isolated, the outer side of the base layer 1 is provided with a passivation layer 3, the material of the passivation layer 3 is aluminum oxide, the thickness of the passivation layer 3 is 1 mm, through the design of the passivation layer 3, the corrosion resistance of the base layer 1 can be further enhanced, and the penetration of external corrosion medium into the base layer 1 is prevented, thereby playing an isolation and protection role.

[0020] Please refer to Figure 2 The outer side of the passivation layer 3 is provided with a blocking layer 4, the material of the blocking layer 4 is zirconium oxide, the thickness of the blocking layer 4 is 1 mm, through the design of the blocking layer 4, the blocking layer 4 can serve as an additional protective barrier, prevent the corrosion medium from diffusing to the base layer 1 through the small defects or grain boundaries of the passivation layer 3, improve the overall corrosion resistance of the pipe material, and the outer side of the blocking layer 4 is provided with an outer protective layer 5, the material of the outer protective layer 5 is acrylic acid, the thickness of the outer protective layer 5 is 1 mm, through the design of the outer protective layer 5, the outer surface of the pipe material can be protected from direct erosion of the external environment.

[0021] Please refer to Figure 2, prolong the service life of the pipe. At the same time, it can also provide certain decorative effect, make the appearance of the pipe more beautiful, the outer side of the outer protective layer 5 is provided with an outer protective layer 6, the material of the outer protective layer 6 is titanium carbide, the thickness of the outer protective layer 6 is 1mm, through the design of the outer protective layer 6, additional protection effect can be provided, prevent the pipe from being physically damaged and chemically corroded in the process of transportation, installation and use, further improve the corrosion resistance and service life of the pipe.

[0022] The specific implementation process of the utility model is as follows: the addition of the inner protective layer 2, material selection: the inner protective layer 2 uses fluorocarbon coating, and the thickness is 1mm. Coating method: fluorocarbon coating can be uniformly coated on the inner side of the base layer 1 by adopting spraying or dipping coating method. Fluorocarbon coating has excellent corrosion resistance and high temperature resistance. Solidification process: after coating, the base layer 1 needs to be baked or solidified to ensure that the inner protective layer 2 is closely combined with the base layer 1;

[0023] The formation of the passivation layer 3, material selection: the passivation layer 3 uses aluminum oxide, and the thickness is 1mm. Oxidation treatment: the base layer 1 is placed in the oxidation liquid, and the aluminum oxide layer is generated by using the electrochemical oxidation process (such as aluminum alloy anodic oxidation). The process is carried out at appropriate temperature and voltage to ensure the uniformity and density of the passivation layer 3. The characteristics of the aluminum oxide layer: the aluminum oxide not only has good corrosion resistance, but also can improve the hardness and wear resistance of the pipe;

[0024] The addition of the barrier layer 4, material selection: the barrier layer 4 uses zirconium oxide, and the thickness is 1mm. Coating method: zirconium oxide is coated outside the passivation layer 3 by adopting spraying or dipping coating method. The formation process of the zirconium oxide coating includes spraying or electrophoretic deposition, and then high temperature solidification or sintering is carried out to ensure the firm adhesion. Barrier effect: the zirconium oxide as the barrier layer 4 has high chemical stability and corrosion resistance, which effectively prevents harmful substances from directly contacting the pipe;

[0025] The addition of the outer protective layer 5, material selection: the outer protective layer 5 uses acrylic acid, and the thickness is 1mm. Coating method: the acrylic coating is applied by spraying or brushing. The acrylic coating has good weather resistance and ultraviolet resistance. Solidification process: after coating is completed, baking or ultraviolet curing is needed to enhance the durability and adhesion of the coating;

[0026] The formation of the outer protective layer 6, material selection: the outer protective layer 6 uses titanium carbide, and the thickness is 1mm. Coating method: the titanium carbide is coated outside the outer protective layer 5 by adopting physical vapor deposition (PVD) technology or chemical vapor deposition (CVD) process. This process can form a firm wear-resistant and corrosion-resistant outer protective layer 6. Protection effect: the titanium carbide coating has very high hardness and high temperature resistance, which can effectively prevent mechanical wear and chemical corrosion;

[0027] Final inspection and quality control, appearance inspection: ensure that each layer of coating is uniform, no bubbles, no falling, meet the appearance quality requirements. Thickness detection: use precision instrument to detect the thickness of each layer, ensure that the thickness of each coating meets the design requirements (1mm). Corrosion resistance test: through salt spray test, immersion test, etc. Corrosion resistance test, ensure the long-term durability of the pipe material in harsh environment.

[0028] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A seamless aluminum alloy pipe having excellent corrosion resistance, comprising a base layer (1), characterized in that: The inner side of the base layer (1) is provided with an inner protective layer (2), the outer side of the base layer (1) is provided with a passivation layer (3), the outer side of the passivation layer (3) is provided with a barrier layer (4), the outer side of the barrier layer (4) is provided with an outer protective layer (5), the outer side of the outer protective layer (5) is provided with an outer protective layer (6), the material of the base layer (1) is aluminum alloy, the material of the inner protective layer (2) is fluorocarbon, the material of the passivation layer (3) is aluminum oxide, the material of the barrier layer (4) is zirconium oxide, the material of the outer protective layer (5) is acrylic acid, and the material of the outer protective layer (6) is titanium carbide.

2. The corrosion resistant seamless aluminum alloy pipe according to claim 1, characterized by: The thickness of the base layer (1) is 3mm.

3. The corrosion resistant seamless aluminum alloy pipe according to claim 1, characterized by: The thickness of the inner protective layer (2) is 1mm.

4. The corrosion resistant seamless aluminum alloy pipe according to claim 1, characterized by: The thickness of the passivation layer (3) is 1mm.

5. The corrosion resistant seamless aluminum alloy pipe according to claim 1, characterized by: The thickness of the barrier layer (4) is 1mm.

6. The corrosion resistant seamless aluminum alloy pipe according to claim 1, characterized by: The thickness of the outer protective layer (5) is 1mm.

7. The corrosion resistant seamless aluminum alloy pipe according to claim 1, characterized by: The thickness of the outer protective layer (6) is 1mm.

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