Aluminum alloy and continuous post-treatment method thereof

Abstract

The invention provides an aluminum alloy and a continuous post-treatment method thereof. The continuous post-treatment method comprises the steps that S1, a cleaning agent and water are adopted for sequentially conducting cleaning treatment and rinsing treatment on the aluminum alloy, and the cleaned aluminum alloy is obtained; s2, passivating treatment is conducted on the cleaned aluminum alloy through a passivating agent, and the passivated aluminum alloy is obtained; s3, the passivated aluminum alloy is subjected to drying treatment; wherein the passivating agent comprises a silane coupling agent, an additive B and an additive C; the cleaning agent comprises a surfactant; the additive B comprises sodium stearate; the additive C comprises micron oxide and / or nano oxide; the aluminum alloy is an aluminum alloy wire or an aluminum alloy wire blank. According to the technical scheme, the problems that in the prior art, a passivating agent has great damage to the human body and the environment, and the applicability of the continuous production process of the aluminum alloy wire rod (wire blank) is extremely low are solved.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy preparation technology, and more specifically, to an aluminum alloy and a continuous post-processing method thereof. Background Technology

[0002] Aluminum alloy wire (bill) is widely used in aerospace, power electronics, rail transportation, construction, and many other fields. However, due to the inherent limited corrosion resistance of aluminum alloys, surface treatment is usually required in practical applications to improve their environmental adaptability during transportation and storage, thereby ensuring the subsequent processing and application of the aluminum alloy wire (bill). Chromate passivation is a traditional and effective treatment method for aluminum alloy wire (bill), which can obtain a wire surface with many advantages such as corrosion resistance, aesthetics, and self-healing. However, the Cr in the chromate passivating agent... 6+ Chromate is a highly toxic heavy metal ion that is extremely harmful to both the human body and the environment. Promoting its replacement is an inevitable trend for environmental protection and health conservation. In recent years, non-toxic / low-toxic passivating agents to replace chromate passivating agents have been developed one after another, but most of them are only suitable for independent parts products and have very low applicability to the dynamic and continuous production process of aluminum alloy wire (bill).

[0003] In summary, there is an urgent need to develop an environmentally friendly cleaning agent, passivating agent, and treatment process for aluminum alloy wire (bill) to solve the above problems. Summary of the Invention

[0004] The main objective of this invention is to provide an aluminum alloy and its continuous post-processing method to solve the problems in the prior art where passivating agents cause great harm to the human body and the environment, and the applicability of continuous production processes for aluminum alloy wires (bills) is extremely low.

[0005] To achieve the above objectives, according to one aspect of the present invention, a continuous post-processing method for aluminum alloys is provided. The continuous post-processing method includes: step S1, sequentially cleaning and rinsing the aluminum alloy with a cleaning agent and water to obtain a cleaned aluminum alloy; step S2, passivating the cleaned aluminum alloy with a passivating agent to obtain a passivated aluminum alloy; and step S3, drying the passivated aluminum alloy. The passivating agent includes a silane coupling agent, additive B, and additive C; the cleaning agent includes a surfactant; additive B includes sodium stearate; additive C includes micron-sized oxides and / or nano-sized oxides; and the aluminum alloy is an aluminum alloy wire or an aluminum alloy wire blank.

[0006] Furthermore, the average particle size of additive C is 50 nm to 3 μm, and additive C is selected from any one or more of SiO2, TiO2, Al2O3 and CeO2.

[0007] Furthermore, additive B also includes cerium nitrate, with the mass ratio of sodium stearate to cerium nitrate being 0.1 to 1:1.

[0008] Further, the mass ratio of additive B, additive C and silane coupling agent is (400~600):(0.3~0.8):10000, preferably (450~600):(0.5~0.8):10000; and / or, the passivating agent also includes a solvent, the volume fraction of which is 92~98%; and / or, the solvent is a mixed solution of ethanol and water, the volume ratio of which is (1.5~4.5):1, preferably (2.5~4.5):1.

[0009] Furthermore, the silane coupling agent is selected from at least one of vinyltrimethoxysilane, γ-methacryloxypropylsilane, vinyltrimethoxysilane, and 3-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0010] Furthermore, in step S3, the drying process includes: increasing the temperature from an initial value in the range of 45-60°C to 100-150°C at a rate of 1-5°C / min.

[0011] Furthermore, in step S2, the passivation treatment temperature is 25~45℃ and the time is 20~120s.

[0012] Further, in step S1, the washing temperature is 25~65℃ and the time is 2~60s; and / or, the rinsing temperature is 20~65℃ and the time is 2~200s; the washing methods for the washing and rinsing are carried out independently by spraying; and / or, the cleaning agent includes inorganic acid, organic acid, surfactant and water, and the mass ratio of inorganic acid, organic acid, surfactant and water is (0.5~3):(0.5~4):(0.05~0.1):100 0, preferably (1~3):(1~3):(0.05~0.1):1000; and / or, the inorganic acid is selected from any one or more of phosphoric acid, sulfuric acid, hydrofluoric acid and nitric acid; and / or, the organic acid is selected from any one or more of citric acid, oxalic acid, acetic acid and malic acid; the surfactant is selected from any one or more of sodium dodecylbenzenesulfonate, decyl glucoside, dipropylene glycol, potassium dodecyl phosphate, sodium lauryl sulfate, fatty alcohol polyoxyethylene ether and sorbitan monooleate.

[0013] Furthermore, prior to post-processing, the aluminum alloy preparation method includes the following sequential processes: batching, casting, homogenization, hot rolling, annealing, and drawing.

[0014] To achieve the above objectives, according to another aspect of the present invention, an aluminum alloy is provided, which is obtained by the above-described continuous post-processing method.

[0015] By applying the technical solution of this invention, this application first removes oil, dust, and oxide layers from the aluminum alloy surface through continuous cleaning and rinsing processes, providing a clean base surface for subsequent passivation treatment and reducing defects (impurities or scratches, etc.) on the aluminum alloy surface. Subsequently, the silane coupling agent in the passivating agent, together with additives B and C, acts on the aluminum alloy surface to form a dense protective film, preventing the intrusion of corrosive media during storage and transportation, thereby significantly improving the surface quality and corrosion resistance of the aluminum alloy. Specifically, the silane coupling agent in the passivating agent forms a silane film on the aluminum alloy surface through chemical bonding; additive B, such as sodium stearate, enhances the adhesion of the silane film; and additive C acts as a micro / nano container for additive B, preventing premature loss of additive B and uniformly dispersing it within the three-dimensional network of the silane coupling agent, effectively filling the pores and defects inside the silane film, further enhancing the density, stability, and corrosion resistance of the protective film. Furthermore, the passivating agent of this application is friendly to humans and the environment, and is suitable for continuous aluminum alloy wire (bill) production processes. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0017] Figure 1 A photograph of the intergranular corrosion cross-sectional morphology of the aluminum alloy wire after cleaning and passivation treatment in Embodiment 1 of this application is shown.

[0018] Figure 2 A photograph of the intergranular corrosion cross-sectional morphology of the aluminum alloy wire without any surface treatment is shown in Comparative Example 1 of this application. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the embodiments.

[0020] As analyzed in the background section of this application, the existing technology has the problems that passivating agents are extremely harmful to human health and the environment, and have very low applicability to continuous production processes of aluminum alloy wire (bill). In order to solve the above problems, this application provides an aluminum alloy and a continuous post-processing method thereof.

[0021] In a typical embodiment of this application, a continuous post-processing method for aluminum alloys is provided. The continuous post-processing method includes: step S1, sequentially cleaning and rinsing the aluminum alloy with a cleaning agent and water to obtain a cleaned aluminum alloy; step S2, passivating the cleaned aluminum alloy with a passivating agent to obtain a passivated aluminum alloy; and step S3, drying the passivated aluminum alloy. The passivating agent includes a silane coupling agent, additive B, and additive C; the cleaning agent includes a surfactant; additive B includes sodium stearate; additive C includes micron-sized oxides and / or nano-sized oxides; and the aluminum alloy is an aluminum alloy wire or an aluminum alloy wire blank.

[0022] This application employs continuous cleaning and rinsing processes to first remove oil, dust, and oxide layers from the aluminum alloy surface, providing a clean base surface for subsequent passivation treatment and reducing surface defects (impurities or scratches). Subsequently, the silane coupling agent in the passivating agent, along with additives B and C, works synergistically on the aluminum alloy surface to form a dense protective film. This prevents corrosive media from penetrating the aluminum alloy during storage and transportation, significantly improving the surface quality and corrosion resistance of the aluminum alloy. Specifically, the silane coupling agent in the passivating agent forms a silane film on the aluminum alloy surface through chemical bonding. Additive B, such as sodium stearate, enhances the adhesion of the silane film. Additive C acts as a micro / nano container for additive B, preventing premature loss and uniformly dispersing within the three-dimensional network of the silane coupling agent. This effectively fills the pores and defects within the silane film, further enhancing the density, stability, and corrosion resistance of the protective film. Furthermore, the passivating agent in this application is human- and environmentally friendly and suitable for continuous aluminum alloy wire (bill) production processes.

[0023] In one embodiment of this application, the average particle size of additive C is 50 nm to 3 μm, and additive C is selected from any one or more of SiO2, TiO2, Al2O3 and CeO2.

[0024] Technically, additive C with the above-mentioned average particle size can more effectively penetrate into the tiny pores of the silane film, forming a denser protective layer. In principle, the addition of additive C, based on its unique physical and chemical properties, can form a nanoscale barrier within the silane film, enhancing the film's protective capabilities. In terms of effect, this embodiment, by adding additive C, significantly improves the corrosion resistance of the passivation film on the aluminum alloy wire surface, maintaining a good surface condition even in harsh environments.

[0025] In one embodiment of this application, additive B further includes cerium nitrate, and the mass ratio of sodium stearate to cerium nitrate is 0.1 to 1:1.

[0026] Cerium nitrate, as a highly efficient corrosion inhibitor, is preferably used in a mass ratio of sodium stearate to cerium nitrate within the above range. This promotes the synergistic effect of cerium nitrate and sodium stearate, further enhancing the corrosion resistance of the passivation film. In principle, the addition of cerium nitrate promotes the oxidation reaction on the aluminum alloy surface, forming a more stable oxide layer that combines with the silane film to create a dual protection mechanism. In terms of effectiveness, this embodiment, by introducing cerium nitrate, not only improves the corrosion resistance of the passivation film but also enhances its self-healing ability. Even with minor surface damage, the protective effect can be quickly restored, ensuring the reliability of the aluminum alloy wire during long-term use.

[0027] In one embodiment of this application, the mass ratio of additive B, additive C and silane coupling agent is (400~600):(0.3~0.8):10000, preferably (450~600):(0.5~0.8):10000; and / or, the passivating agent further includes a solvent, the volume fraction of which is 92~98%; and / or, the solvent is a mixed solution of ethanol and water, the volume ratio of which is (1.5~4.5):1, preferably (2.5~4.5):1.

[0028] Controlling the mass ratio of additives B, C, and the silane coupling agent helps promote their synergistic effect. Further controlling the appropriate solvent ratio within the above range, through this mass ratio control, helps promote the uniform distribution and efficient film formation of the silane coupling agent on the aluminum alloy surface, while avoiding cracking caused by excessive internal stress in the film layer. Furthermore, controlling the solvent ratio helps adapt to the speed requirements of different production lines, ensuring the formation of a high-quality passivation film even under rapid production conditions.

[0029] In one embodiment of this application, the silane coupling agent is selected from at least one of vinyltrimethoxysilane, γ-methacryloxypropylsilane, vinyltrimethoxysilane, and 3-(2,3-epoxypropoxy)propyltrimethoxysilane.

[0030] The choice of silane coupling agent directly affects the performance of the passivation film; different types of silane coupling agents can impart different properties to aluminum alloy wires. In principle, these silane coupling agents bond with the metal atoms on the aluminum alloy surface through chemical bonds, forming a stable silane film that effectively isolates corrosive media. In terms of effect, the technical solution in this embodiment, through the appropriate selection of silane coupling agents, not only improves the corrosion resistance of the aluminum alloy wire but also enhances its surface gloss and aesthetics.

[0031] In one embodiment of this application, step S3 includes drying the temperature by increasing it from an initial value in the range of 45-60°C to 100-150°C at a rate of 1-5°C / min.

[0032] The gradient heating drying process described above helps reduce internal stress in the film layer, lowering the risk of film cracking caused by sudden temperature changes, while ensuring full curing of the film. Furthermore, it avoids the deactivation of additives B and C due to excessively high temperatures, ensuring film formation. In principle, the gradually increasing temperature helps the molecular chains of the silane film gradually relax, releasing internal stress and promoting a strong bond between the film layer and the aluminum alloy surface. In terms of effectiveness, the technical solution in this embodiment, by controlling the above drying conditions, not only avoids the generation of film defects but also ensures the overall quality of the aluminum alloy surface after treatment.

[0033] In one embodiment of this application, in step S2, the passivation treatment temperature is 25~45℃ and the time is 20~120s.

[0034] The temperature and time of passivation treatment directly affect the formation speed and quality of the silane film. In principle, suitable temperature and time can promote the uniform deposition of the silane coupling agent on the aluminum alloy surface, forming a dense and strongly adherent passivation film. In terms of effectiveness, the technical solution in this embodiment, by controlling the passivation treatment conditions, ensures the formation of a uniform and stable passivation film on the surface of the aluminum alloy wire, significantly improving its corrosion resistance.

[0035] In one embodiment of this application, in step S1, the temperature of the cleaning treatment is 25~65℃ and the time is 2~60s; and / or, the temperature of the rinsing treatment is 20~65℃ and the time is 2~200s; the cleaning treatment and the rinsing treatment are each carried out independently by spraying; and / or, the cleaning agent includes inorganic acid, organic acid, surfactant and water, and the mass ratio of inorganic acid, organic acid, surfactant and water is (0.5~3):(0.5~4):(0.05~0.1). :1000, preferably (1~3):(1~3):(0.05~0.1):1000; and / or, the inorganic acid is selected from any one or more of phosphoric acid, sulfuric acid, hydrofluoric acid and nitric acid; and / or, the organic acid is selected from any one or more of citric acid, oxalic acid, acetic acid and malic acid; the surfactant is selected from any one or more of sodium dodecylbenzenesulfonate, decyl glucoside, dipropylene glycol, potassium dodecyl phosphate, sodium lauryl sulfate, fatty alcohol polyoxyethylene ether and sorbitan monooleate.

[0036] By precisely controlling the composition of the cleaning agent and the treatment conditions, highly efficient cleaning of the aluminum alloy wire surface was achieved. The combination of inorganic and organic acids effectively dissolves oil and oxide layers, while surfactants enhance the wetting and emulsifying capabilities of the cleaning agent, ensuring thorough cleaning.

[0037] In one embodiment of this application, the aluminum alloy is an aluminum alloy wire or an aluminum alloy wire blank; and / or, before post-processing the aluminum alloy, the preparation method of the aluminum alloy includes sequentially and continuously performing: batching, melting and casting, homogenization, hot rolling, annealing, and drawing.

[0038] Technically, the solution presented in this application is applicable not only to finished aluminum alloy wires but also to semi-finished aluminum alloy blanks, demonstrating its broad applicability. In principle, the aluminum alloy preparation process determines its microstructure and surface state, while post-treatment further optimizes surface properties, making it more suitable for subsequent processing and applications. In terms of effectiveness, the above-mentioned aluminum alloy preparation method helps to comprehensively improve the surface quality of aluminum alloy wires or blanks, significantly enhancing both mechanical properties and corrosion resistance.

[0039] In another typical embodiment of this application, an aluminum alloy is provided, which is obtained by the above-described continuous post-processing method.

[0040] The aluminum alloy wires or blanks obtained by the above continuous post-processing method not only have smooth and clean surfaces, but also have excellent corrosion resistance and can maintain good condition in various environments.

[0041] The beneficial effects of this application will be further illustrated below with reference to the embodiments.

[0042] Example 1

[0043] (1) Cleaning treatment: Prepare a mixed solution of phosphoric acid, citric acid, sodium dodecyl sulfate and pure water as a cleaning agent with a mass ratio of 3:4:0.1:1000; clean the aluminum alloy wire in the cleaning agent at a temperature of 25°C for 10 seconds, rinse with deionized water at a temperature of 20°C for 200 seconds, and dry with hot air.

[0044] (2) Passivation treatment: A mixed solution of vinyltrimethoxysilane, nano-SiO2 (average particle size of 80nm), sodium stearate, cerium nitrate and solvent was prepared as a passivating agent. The mass ratio of the sum of the masses of cerium nitrate and sodium stearate, nano-SiO2 and vinyltrimethoxysilane was 450:0.5:10000, the mass ratio of sodium stearate to cerium nitrate was 0.5:1, and the solvent was a mixed solution of ethanol and water with a volume ratio of 4:1. The cleaned aluminum alloy wire was passivated in the passivating agent at a temperature of 25℃ for 120s.

[0045] (3) Drying treatment: The passivated aluminum alloy wire is dried. The drying process involves increasing the temperature from an initial value of 45°C to 120°C at a rate of 3°C / min, with a total drying time of 5min. This completes the surface cleaning and passivation process of the aluminum alloy wire. The cross-sectional morphology of the intergranular corrosion of the aluminum alloy wire after cleaning and passivation treatment is shown in the following image. Figure 1 As shown.

[0046] Example 2

[0047] The difference between this embodiment and Embodiment 1 is that the cleaning agent consists of hydrofluoric acid, malic acid, sodium lauryl sulfate, and pure water in a mass ratio of 0.5:0.5:0.05:1000, which ultimately completes the surface cleaning and passivation process of the aluminum alloy wire.

[0048] Example 3

[0049] The difference between this embodiment and Embodiment 1 is that the total mass ratio of cerium nitrate and sodium stearate, nano-SiO2, and vinyltrimethoxysilane is 400:0.3:10000, which ultimately completes the surface cleaning and passivation process of the aluminum alloy wire.

[0050] Example 4

[0051] The difference between this embodiment and embodiment 1 is that the cleaning temperature is 65℃ and the cleaning spray time is 60s, thus completing the surface cleaning and passivation process of the aluminum alloy wire.

[0052] Example 5

[0053] The difference between this embodiment and Embodiment 1 is that the passivation temperature is 45℃ and the passivation spraying time is 20s, thus completing the surface cleaning and passivation process of the aluminum alloy wire.

[0054] Example 6

[0055] The difference between this embodiment and Embodiment 1 is that the drying process is carried out directly at 120°C for 5 minutes, which ultimately completes the surface cleaning and passivation process of the aluminum alloy wire.

[0056] Example 7

[0057] The difference between this embodiment and Embodiment 1 is that the mass ratio of sodium stearate to cerium nitrate is 1:1, which ultimately completes the surface cleaning and passivation process of the aluminum alloy wire.

[0058] Example 8

[0059] The difference between this embodiment and Embodiment 1 is that the mass ratio of sodium stearate to cerium nitrate is 2:1, which ultimately completes the surface cleaning and passivation process of the aluminum alloy wire.

[0060] Example 9

[0061] The difference between this embodiment and Embodiment 1 is that the volume ratio of ethanol to water is 1.5:1, which ultimately completes the surface cleaning and passivation process of the aluminum alloy wire.

[0062] Example 10

[0063] The difference between this embodiment and Embodiment 1 is that the silane coupling agent is 3-(2,3-epoxypropoxy)propyltrimethoxysilane, which ultimately completes the surface cleaning and passivation process of the aluminum alloy wire.

[0064] Comparative Example 1

[0065] Aluminum alloy wires were prepared using the same process as in Example 1, except that no cleaning or passivation treatment was performed. The final cleaning and passivation process for the aluminum alloy wires was completed. A photograph of the intergranular corrosion cross-sectional morphology of the aluminum alloy wires without any surface treatment is shown below. Figure 2 As shown.

[0066] Comparative Example 2

[0067] Aluminum alloy wires were prepared using the same process as in Example 1, and then passivated and dried. The difference was that no cleaning process was performed, thus completing the surface cleaning and passivation process of the aluminum alloy wires.

[0068] Comparative Example 3

[0069] Aluminum alloy wires were prepared using the same process as in Example 1, and then cleaned and dried. The difference was that no passivation treatment was performed. Finally, the surface cleaning and passivation process of the aluminum alloy wires was completed.

[0070] Comparative Example 4

[0071] Aluminum alloy wires were prepared using the same process as in Example 1, and then cleaned and passivated. The difference was that no drying process was performed, thus completing the surface cleaning and passivation process of the aluminum alloy wires.

[0072] Comparative Example 5

[0073] Aluminum alloy wires were prepared using the same process as in Example 1, and then cleaned, passivated, and dried. The difference was that the cleaning agent did not contain any surfactants, thus completing the surface cleaning and passivation process of the aluminum alloy wires.

[0074] Comparative Example 6

[0075] Aluminum alloy wire was prepared using the same process as in Example 1, and then cleaned, passivated, and dried. The difference was that the passivating agent did not contain additive component B, thus completing the surface cleaning and passivation process of the aluminum alloy wire.

[0076] Comparative Example 7

[0077] Aluminum alloy wire was prepared using the same process as in Example 1, and then cleaned, passivated, and dried. The difference was that the passivating agent did not contain additive C, thus completing the surface cleaning and passivation process of the aluminum alloy wire.

[0078] Comparative Example 8

[0079] Aluminum alloy wire was prepared using the same process as in Example 1, and then cleaned, passivated, and dried. The difference was that the passivating agent was Alodin 1200S passivating agent, which completed the surface cleaning and passivation process of the aluminum alloy wire.

[0080] Performance testing

[0081] Surface defect analysis: The aluminum alloy wires of the above examples and comparative examples were observed on the surface of the wires using an optical microscope. The number of defects such as scratches, folds, and bumps on the surface of the wires was counted. Three parallel samples were set for each type of sample, and the wire length was 50cm.

[0082] Intergranular corrosion test: Intergranular corrosion tests were conducted on the above examples and comparative examples in accordance with standard GB / T 7998-2023.

[0083] Surface brightness (L) test: The surface brightness (L) of the above embodiments and comparative examples was tested using a spectrophotometer.

[0084] The test results are listed in Table 1.

[0085] Table 1

[0086]

[0087] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0088] This application employs continuous cleaning and rinsing processes to first remove oil, dust, and oxide layers from the aluminum alloy surface, providing a clean base surface for subsequent passivation treatment and reducing surface defects (impurities or scratches). Subsequently, the silane coupling agent in the passivating agent, along with additives B and C, works synergistically on the aluminum alloy surface to form a dense protective film. This prevents corrosive media from penetrating the aluminum alloy during storage and transportation, significantly improving the surface quality and corrosion resistance of the aluminum alloy. Specifically, the silane coupling agent in the passivating agent forms a silane film on the aluminum alloy surface through chemical bonding. Additive B, such as sodium stearate, enhances the adhesion of the silane film. Additive C acts as a micro / nano container for additive B, preventing premature loss and uniformly dispersing within the three-dimensional network of the silane coupling agent. This effectively fills the pores and defects within the silane film, further enhancing the density, stability, and corrosion resistance of the protective film. Furthermore, the passivating agent in this application is human- and environmentally friendly and suitable for continuous aluminum alloy wire (bill) production processes.

[0089] The above are merely embodiments of the present invention and are not intended to limit the invention. Those skilled in the art will recognize that the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A continuous post-processing method for aluminum alloys, characterized in that, The continuous post-processing method includes: Step S1: The aluminum alloy is cleaned and rinsed sequentially using a cleaning agent and water to obtain a cleaned aluminum alloy. Step S2: Passivate the cleaned aluminum alloy with a passivating agent to obtain a passivated aluminum alloy. Step S3: Dry the passivated aluminum alloy. The passivating agent includes a silane coupling agent, additive B, and additive C. The cleaning agent includes a surfactant; Additive B includes sodium stearate; The additive C includes micron-sized oxides and / or nano-sized oxides; The aluminum alloy is aluminum alloy wire or aluminum alloy wire blank.

2. The continuous post-processing method according to claim 1, characterized in that, The average particle size of the additive C is 50 nm to 3 μm, and the additive C is selected from any one or more of SiO2, TiO2, Al2O3 and CeO2.

3. The continuous post-processing method according to claim 1, characterized in that, Additive B also includes cerium nitrate, and the mass ratio of sodium stearate to cerium nitrate is 0.1 to 1:

1.

4. The continuous post-processing method according to any one of claims 1 to 3, characterized in that, The mass ratio of additive B, additive C and silane coupling agent is (400~600):(0.3~0.8):10000; and / or, the passivating agent further includes a solvent, the volume fraction of the solvent in the passivating agent is 92~98%; and / or, the solvent is a mixed solution of ethanol and water, the volume ratio of ethanol and water is (1.5~4.5):

1.

5. The continuous post-processing method according to any one of claims 1 to 3, characterized in that, The silane coupling agent is selected from at least one of vinyltrimethoxysilane, γ-methacryloxypropylsilane, vinyltrimethoxysilane and 3-(2,3-epoxypropoxy)propyltrimethoxysilane.

6. The continuous post-processing method according to any one of claims 1 to 3, characterized in that, In step S3, the drying process includes: The temperature is increased from an initial value in the range of 45-60℃ to 100-150℃ at a rate of 1-5℃ / min.

7. The continuous post-processing method according to any one of claims 1 to 3, characterized in that, In step S2, the passivation treatment temperature is 25~45℃ and the time is 20~120s.

8. The continuous post-processing method according to any one of claims 1 to 3, characterized in that, In step S1, the temperature of the cleaning process is 25~65℃ and the time is 2~60s; and / or, the temperature of the rinsing process is 20~65℃ and the time is 2~200s; the cleaning process and the rinsing process are each carried out independently by spraying. And / or, the cleaning agent comprises an inorganic acid, an organic acid, the surfactant, and water, wherein the mass ratio of the inorganic acid, the organic acid, the surfactant, and the water is (0.5~3):(0.5~4):(0.05~0.1):1000; And / or, the inorganic acid is selected from any one or more of phosphoric acid, sulfuric acid, hydrofluoric acid and nitric acid; and / or, the organic acid is selected from any one or more of citric acid, oxalic acid, acetic acid and malic acid; the surfactant is selected from any one or more of sodium dodecylbenzenesulfonate, decyl glucoside, dipropylene glycol, potassium dodecyl phosphate, sodium lauryl sulfate, fatty alcohol polyoxyethylene ether and sorbitan monooleate.

9. The continuous post-processing method according to any one of claims 1 to 3, characterized in that, Before post-processing the aluminum alloy, the preparation method of the aluminum alloy includes the following sequential processes: batching, melting and casting, homogenization, hot rolling, annealing, and drawing.

10. An aluminum alloy, characterized in that, The aluminum alloy is obtained by the continuous post-processing method according to any one of claims 1 to 9.

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