Aluminum alloy surface cleaning solution and preparation method and cleaning method thereof

Abstract

The invention provides an aluminum alloy surface cleaning solution as well as a preparation method and a cleaning method thereof. The aluminum alloy surface cleaning solution is prepared from the following components in parts by weight: 10 to 40 parts of an etching agent, 0.02 to 0.2 part of a corrosion inhibitor, 0.2 to 1.2 parts of a surfactant and 0.5 to 10 parts of an auxiliary agent, the mass ratio of the etching agent to the surfactant is 100: (1-10); the mass ratio of the etching agent to the corrosion inhibitor is 100: (0.1-0.5). The aluminum alloy surface cleaning solution disclosed by the invention has good stability, can effectively remove impurities, aluminum skimmings and the like attached to the surface of an aluminum alloy by compounding key components such as the etching agent, the corrosion inhibitor, the surfactant and the auxiliary agent, and can also realize flattening treatment on surface structure defects of the aluminum alloy; therefore, the aluminum alloy surface with high quality is obtained, and the method is better suitable for cleaning the surface of the aluminum alloy strip for the CTP plate.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy technology, and more specifically, to an aluminum alloy surface cleaning liquid and its preparation and cleaning methods. Background Technology

[0002] CTP (Computer-to-Plate) printing plates require high surface quality from the aluminum substrate. Generally, the aluminum substrate should have excellent appearance quality, uniform texture, and be free from stains, unevenness, scratches, creases, edge oxidation, non-metallic indentation, and other defects that affect printing, such as visible rolling marks and calendering lines. However, in the actual production process, aluminum alloy strips often inevitably introduce various defects onto their surface, such as contaminants, oxide films, and scratches. The presence of these defects severely reduces the production quality of the aluminum alloy strip, significantly lowering the quality of subsequent anodizing and coating processes, ultimately affecting the printing quality of the CTP plate.

[0003] To improve the surface quality of aluminum alloy strips, various cleaning solutions and methods have been developed. However, most of these solutions suffer from problems such as complex preparation and processing, insufficient stability, and extremely low applicability to dynamic and continuous aluminum alloy strip production processes. Therefore, there is an urgent need to develop a cleaning solution and treatment method suitable for aluminum alloy strips used in CTP printing. Summary of the Invention

[0004] The main objective of this invention is to provide an aluminum alloy surface cleaning fluid and its preparation and cleaning methods, in order to solve the problems of insufficient stability leading to poor cleaning effect, complex cleaning methods, and poor applicability to dynamic and continuous aluminum alloy strip production processes in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, an aluminum alloy surface cleaning solution is provided, comprising, by weight: 10-40 parts of an etchant, 0.02-0.2 parts of a corrosion inhibitor, 0.2-1.2 parts of a surfactant, and 0.5-10 parts of an additive; the mass ratio of the etchant to the surfactant is 100:1-10; and the mass ratio of the etchant to the corrosion inhibitor is 100:0.1-0.5.

[0006] Furthermore, by weight, the above-mentioned aluminum alloy surface cleaning solution includes: 12 to 30 parts of etchant, 0.1 to 0.18 parts of corrosion inhibitor, 0.2 to 1.2 parts of surfactant, and 1.2 to 8 parts of additives.

[0007] Furthermore, the etchant is selected from any one or more of ammonium bifluoride, citric acid, glycolic acid, acetic acid, tartaric acid, nitric acid, sulfuric acid, and hydrofluoric acid; when the etchant is a combination of tartaric acid and hydrofluoric acid, the mass ratio of tartaric acid to hydrofluoric acid is 0.1~0.6:1.

[0008] Furthermore, the corrosion inhibitor is an organic corrosion inhibitor and / or an inorganic corrosion inhibitor, wherein the organic corrosion inhibitor is selected from any one or more of Lan826, sodium citrate, glycerol and imidazoline, and the inorganic corrosion inhibitor is cerium nitrate; when the corrosion inhibitor is a combination of sodium citrate and cerium nitrate, the mass ratio of sodium citrate to cerium nitrate is 6~9:1.

[0009] Furthermore, the surfactant is a nonionic surfactant and / or anionic surfactant, wherein the nonionic surfactant is selected from any one or more of isooctanol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and isopropyl alcohol glucoside, and the anionic surfactant is sodium dodecylbenzenesulfonate and / or sodium dodecyl sulfate; when the surfactant is a combination of isopropyl alcohol glucoside and sodium dodecylbenzenesulfonate, the mass ratio of isopropyl alcohol glucoside to sodium dodecylbenzenesulfonate is 1.5~3.5:1.

[0010] Furthermore, the additives are selected from any one or more of ethylene glycol, glycerol, polyethylene glycol, sodium sulfate, and potassium sodium tartrate.

[0011] Furthermore, the aluminum alloy surface cleaning solution also includes a solvent, which is water, and the solvent is 40 to 60 parts by weight.

[0012] According to another aspect of the present invention, a method for preparing the above-mentioned aluminum alloy surface cleaning liquid is provided, the method comprising: mixing raw materials including an etchant, a corrosion inhibitor, a surfactant and an additive to obtain an aluminum alloy surface cleaning liquid.

[0013] According to another aspect of the present invention, a cleaning method for an aluminum alloy surface cleaning solution is provided, the cleaning method comprising: immersing and rinsing an aluminum alloy in an aluminum alloy surface cleaning solution to obtain a surface-cleaned aluminum alloy; wherein the aluminum alloy surface cleaning solution is the aluminum alloy surface cleaning solution described above or prepared by the preparation method described above.

[0014] Furthermore, the immersion time is 20~100s, the immersion temperature is 20~60℃; and / or, the surface of the aluminum alloy after immersion is rinsed with water; the rinsing time is 30~500s.

[0015] Applying the technical solution of this invention, the aluminum alloy surface cleaning solution of this application has good stability. By compounding key components such as etchants, corrosion inhibitors, surfactants, and additives, it can not only effectively remove impurities and aluminum chips attached to the aluminum alloy surface, but also smooth out surface defects, thereby obtaining a high-quality aluminum alloy surface, and thus better suited for cleaning the surface of aluminum alloy strips used in CTP plates. Specifically, the main function of the etchant is to remove the oxide film and other impurities on the aluminum alloy surface. It removes or dissolves the oxide layer on the aluminum alloy surface, making the surface clean and thus beneficial for subsequent anodizing or coating processes. The corrosion inhibitor can protect the aluminum alloy substrate from excessive corrosion while removing surface impurities. By forming a thin protective film on the aluminum alloy surface, the corrosion inhibitor can prevent or slow down the corrosive effect of the etchant on the aluminum alloy. The surfactant reduces the surface tension of the aluminum alloy surface cleaning solution, enhancing its wettability and penetration on the aluminum alloy surface. At the same time, the surfactant can also remove grease and organic dirt from the aluminum alloy surface through emulsification and dispersion, thereby improving the cleaning effect. Additives can optimize the physicochemical properties of aluminum alloy surface cleaning solutions, thereby improving the cleaning effect. Furthermore, the cleaning method of the aluminum alloy surface cleaning solution of this application is simple and applicable to dynamic and continuous aluminum alloy wire production processes, ensuring that aluminum alloy strips have a uniform and clean surface before leaving the factory. Detailed Implementation

[0016] 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.

[0017] As analyzed in the background section of this application, existing aluminum alloy cleaning solutions suffer from insufficient stability leading to poor cleaning results, complex cleaning methods, and poor applicability to dynamic and continuous aluminum alloy strip production processes. To address these issues, this application provides an aluminum alloy surface cleaning solution, its preparation method, and a cleaning method thereof.

[0018] In a typical embodiment of this application, an aluminum alloy surface cleaning solution is provided, comprising, by weight: 10-40 parts of etchant, 0.02-0.2 parts of corrosion inhibitor, 0.2-1.2 parts of surfactant, and 0.5-10 parts of additives; the mass ratio of etchant to surfactant is 100:1-10; and / or, the mass ratio of etchant to corrosion inhibitor is 100:0.1-0.5.

[0019] The aluminum alloy surface cleaning solution of this application exhibits excellent stability. By compounding key components such as etchants, corrosion inhibitors, surfactants, and additives, it can not only effectively remove impurities and aluminum shavings adhering to the aluminum alloy surface, but also smooth out surface defects, resulting in a high-quality aluminum alloy surface. This makes it better suited for cleaning the surface of aluminum alloy strips used in CTP plates. Specifically, the etchant's main function is to remove the oxide film and other impurities from the aluminum alloy surface. By etching or dissolving the oxide layer on the aluminum alloy surface, it achieves a clean surface, which is beneficial for subsequent anodizing or coating processes. The corrosion inhibitor can protect the aluminum alloy substrate from excessive corrosion while removing surface impurities. By forming a thin protective film on the aluminum alloy surface, the corrosion inhibitor can prevent or slow down the corrosive effect of the etchant on the aluminum alloy. The surfactant reduces the surface tension of the aluminum alloy surface cleaning solution, enhancing its wettability and penetration on the aluminum alloy surface. Simultaneously, the surfactant can also remove grease and organic dirt from the aluminum alloy surface through emulsification and dispersion, thereby improving the cleaning effect. Furthermore, controlling the mass ratio of etchant to surfactant within the aforementioned range enhances their synergistic effect, thereby further improving the cleaning effect of the aluminum alloy surface cleaning solution and consequently increasing the cleanliness and smoothness of the aluminum alloy surface. Controlling the mass ratio of etchant to corrosion inhibitor within the aforementioned range also enhances their synergistic effect, thus protecting the aluminum alloy substrate while improving the cleaning effect. Additives can optimize the physicochemical properties of the aluminum alloy surface cleaning solution, thereby improving the cleaning effect. In addition, the cleaning method of the aluminum alloy surface cleaning solution of this application is simple and applicable to dynamic and continuous aluminum alloy wire production processes, ensuring that the aluminum alloy strip has a uniform and clean surface before leaving the factory.

[0020] In order to further improve the stability of the aluminum alloy surface cleaning solution and the surface treatment effect of the aluminum alloy, in one embodiment of this application, the aluminum alloy surface cleaning solution includes, by weight, 12 to 30 parts of etchant, 0.1 to 0.18 parts of corrosion inhibitor, 0.2 to 1.2 parts of surfactant and 1.2 to 8 parts of additives.

[0021] A preferred mass ratio of corrosion inhibitor to surfactant of 0.2–0.9:1 helps to further improve the protective effect on the aluminum alloy surface. During the cleaning process, the surfactant forms a thin liquid film on the aluminum alloy surface. This film may sometimes be uneven, causing some areas of the aluminum alloy surface to be directly exposed to the etchant, thus causing corrosion. The addition of corrosion inhibitor helps to form a more stable and uniform protective film on top of this liquid film, thereby reducing the erosion of the aluminum alloy by the etchant at the weak points of the liquid film, and thus enhancing the protection of the aluminum alloy surface throughout the cleaning process.

[0022] In one embodiment of this application, the etchant is selected from any one or more of ammonium bifluoride, citric acid, glycolic acid, acetic acid, tartaric acid, nitric acid, sulfuric acid and hydrofluoric acid, preferably ammonium bifluoride, citric acid, acetic acid, tartaric acid and hydrofluoric acid; when the etchant is a combination of tartaric acid and hydrofluoric acid, the mass ratio of tartaric acid to hydrofluoric acid is 0.1~0.6:1.

[0023] Preferably using an etchant within the aforementioned range helps to better remove the oxide film and other impurities from the aluminum alloy surface. Tartaric acid can remove Al from the solution through a complexation reaction. 3+ It produces a certain corrosion inhibition effect, which can prevent excessive corrosion of aluminum alloys. Hydrofluoric acid can quickly dissolve impurities and oxides on the surface of aluminum alloys, especially silicon and its compounds, and can quickly obtain a smooth surface. When the etching agent is preferably a combination of tartaric acid and hydrofluoric acid, controlling the mass ratio of tartaric acid and hydrofluoric acid within the above range helps to improve the etching effect and cleaning efficiency of the etching agent, so that the surface of aluminum alloy is clean, which is conducive to the implementation of subsequent anodizing or coating processes.

[0024] In one embodiment of this application, the corrosion inhibitor is an organic corrosion inhibitor and / or an inorganic corrosion inhibitor, wherein the organic corrosion inhibitor is selected from any one or more of Lan86, sodium citrate, glycerol and imidazoline, and the inorganic corrosion inhibitor is cerium nitrate; when the corrosion inhibitor is a combination of sodium citrate and cerium nitrate, the mass ratio of sodium citrate to cerium nitrate is 6~9:1.

[0025] Preferred corrosion inhibitors fall within the above-mentioned range, helping to remove surface impurities while protecting the aluminum alloy substrate. Sodium citrate can react with Al... 3+ The formation of stable complexes and adsorption onto the aluminum alloy surface inhibits the anodic corrosion reaction. Cerium nitrate can generate insoluble Ce(OH)3 in the cathode region and further oxidize it to more stable CeO2, which is deposited on the cathode surface, thus inhibiting the anodic corrosion reaction. When the preferred corrosion inhibitor is a combination of sodium citrate and cerium nitrate, controlling the mass ratio of sodium citrate to cerium nitrate within the above range helps to form a dense and stable "hybrid" protective film on the aluminum alloy surface, which inhibits both anodic and cathodic reactions, thereby better protecting the aluminum alloy.

[0026] In one embodiment of this application, the surfactant is a nonionic surfactant and / or anionic surfactant, wherein the nonionic surfactant is selected from any one or more of isooctanol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and isopropyl alcohol glucoside, and the anionic surfactant is sodium dodecylbenzenesulfonate and / or sodium dodecyl sulfate; when the surfactant is a combination of isopropyl alcohol glucoside and sodium dodecylbenzenesulfonate, the mass ratio of isopropyl alcohol glucoside to sodium dodecylbenzenesulfonate is 1.5~3.5:1.

[0027] Preferably using surfactants within the aforementioned range helps reduce the surface tension of the aluminum alloy surface cleaning solution, enhancing its wettability and penetration on the aluminum alloy surface. Isomerized glucoside can rapidly penetrate to the bottom of the dirt, quickly wetting the aluminum alloy surface. Sodium dodecylbenzenesulfonate has strong degreasing and emulsifying capabilities, especially for mineral oil, lubricating oil, and particulate dirt. When the preferred surfactant is a combination of isomerized glucoside and sodium dodecylbenzenesulfonate, controlling the mass ratio of isomerized glucoside to sodium dodecylbenzenesulfonate within the aforementioned range helps further reduce the surface tension of the aluminum alloy surface cleaning solution. Simultaneously, through emulsification and dispersion, grease and organic dirt are stripped from the aluminum alloy surface, thereby improving the cleaning effect.

[0028] In one embodiment of this application, the additive is selected from any one or more of ethylene glycol, glycerol, polyethylene glycol, sodium sulfate, and potassium sodium tartrate.

[0029] The preferred additives fall within the aforementioned range. These additives not only help improve the chemical and thermal stability of the aluminum alloy surface cleaning solution and adjust its physical properties, thus ensuring uniform etching of the aluminum alloy surface, but also assist the corrosion inhibitor in forming a more robust protective layer, further enhancing the protection of the aluminum alloy strip. Specifically, polyethylene glycol helps increase the stability of the aluminum alloy surface cleaning solution, thereby maintaining its cleaning effect. Glycerol and ethylene glycol help adjust the viscosity, allowing the aluminum alloy surface cleaning solution to better adhere to the aluminum alloy surface during immersion or spraying, thereby improving cleaning coverage and efficiency.

[0030] In one embodiment of this application, the aluminum alloy surface cleaning liquid further includes a solvent, which is water, and the solvent is 40 to 60 parts by weight.

[0031] Water is the preferred solvent, and its content is controlled within the above range. This helps to ensure that the components are uniformly dissolved in the solvent, thereby maintaining the stability of the aluminum alloy surface cleaning solution.

[0032] In another typical embodiment of this application, a method for preparing the above-mentioned aluminum alloy surface cleaning liquid is provided. The preparation method includes mixing raw materials including an etchant, a corrosion inhibitor, a surfactant, and an additive to obtain an aluminum alloy surface cleaning liquid.

[0033] The aluminum alloy surface cleaning solution obtained by the above preparation method has good stability. It can not only effectively remove impurities and aluminum chips attached to the aluminum alloy surface, but also smooth out surface defects, thereby obtaining a high-quality aluminum alloy surface. This makes it more suitable for cleaning the surface of aluminum alloy strips used in CTP plates. In addition, the preparation method of the aluminum alloy surface cleaning solution of this application is simple and easy to mass-produce and use.

[0034] In another typical embodiment of this application, a cleaning method for an aluminum alloy surface cleaning solution is provided. The cleaning method includes: immersing and rinsing the aluminum alloy in the aluminum alloy surface cleaning solution to obtain a surface-cleaned aluminum alloy; wherein the aluminum alloy surface cleaning solution is the aluminum alloy surface cleaning solution described above or prepared by the preparation method described above.

[0035] This application immerses the aluminum alloy in an aluminum alloy surface cleaning solution, which effectively cleans impurities from the aluminum alloy surface and smooths the surface. After removing the aluminum alloy from the cleaning solution, rinsing removes residual cleaning solution and loose impurities. The cleaning method of this application is simple and easy to operate. Using the aforementioned aluminum alloy surface cleaning solution to clean the aluminum alloy not only effectively removes impurities and aluminum shavings adhering to the surface but also smooths surface defects, resulting in a high-quality aluminum alloy surface.

[0036] The preferred aluminum alloy is aluminum alloy strip, and the aluminum alloy strip model is selected from any one or more of 1050, 1060, 3003, 3004, 3104, 5005, and 5052.

[0037] In one embodiment of this application, the immersion time is 20~100s, the immersion temperature is 20~60℃; and / or, the surface of the aluminum alloy after immersion is rinsed with water; the rinsing time is 30~500s.

[0038] The optimal immersion time and temperature, falling within the aforementioned ranges, facilitate sufficient contact between the aluminum alloy surface cleaning solution and the aluminum alloy surface, thereby improving cleaning efficiency and effectiveness. Similarly, the optimal rinsing time, within the aforementioned range, helps to thoroughly remove residual aluminum alloy surface cleaning solution and impurities. During the rinsing stage, the mechanical force of the water flow further smooths the aluminum alloy surface, reducing minor scratches or irregularities, thus improving the surface finish and uniformity.

[0039] After rinsing, the aluminum alloy undergoes a drying process to remove moisture from its surface, reducing secondary contamination and corrosion. The drying method can be any one or more of natural air drying, hot air drying, and oven drying.

[0040] The beneficial effects of this application will be further illustrated below with reference to the embodiments.

[0041] Example 1

[0042] Preparation of aluminum alloy surface cleaning solution: 30 parts by weight of etchant ammonium bifluoride, 0.1 parts by weight of corrosion inhibitor cerium nitrate, 0.05 parts by weight of corrosion inhibitor imidazoline, 0.5 parts by weight of surfactant sodium dodecylbenzenesulfonate, 5 parts by weight of auxiliary agent glycerol and 40 parts by weight of solvent water are stirred until completely dissolved to obtain aluminum alloy surface cleaning solution.

[0043] Cleaning method: Immerse the aluminum alloy strip 1050 in an aluminum alloy surface cleaning solution to obtain an immersed aluminum alloy; the immersion time is 60s, and the immersion temperature is 40℃. Rinse the surface of the immersed aluminum alloy with flowing deionized water for 300s to obtain a cleaned aluminum alloy.

[0044] Example 2

[0045] Preparation of aluminum alloy surface cleaning solution: By weight, 20 parts of nitric acid (etching agent), 20 parts of sulfuric acid (etching agent), 0.05 parts of Lan826 (corrosion inhibitor), 0.05 parts of cerium nitrate (corrosion inhibitor), 0.6 parts of alkylphenol polyoxyethylene ether (surfactant), 10 parts of glycerol (auxiliary agent), and 50 parts of water (solvent) are stirred until completely dissolved to obtain aluminum alloy surface cleaning solution.

[0046] Cleaning method: Immerse the 1060 aluminum alloy strip in an aluminum alloy surface cleaning solution to obtain an immersed aluminum alloy; the immersion time is 100s, and the immersion temperature is 60℃. Rinse the surface of the immersed aluminum alloy with flowing deionized water for 500s to obtain a cleaned aluminum alloy.

[0047] Example 3

[0048] Preparation of aluminum alloy surface cleaning solution: By weight, 10 parts of etchant hydrofluoric acid, 0.02 parts of corrosion inhibitor sodium citrate, 0.2 parts of surfactant alkylphenol isooctyl alcohol polyoxyethylene ether, 0.5 parts of auxiliary agent ethylene glycol and 60 parts of solvent water are stirred until completely dissolved to obtain aluminum alloy surface cleaning solution.

[0049] Cleaning method: Immerse the 3003 aluminum alloy strip in an aluminum alloy surface cleaning solution to obtain an immersed aluminum alloy; the immersion time is 20 seconds, and the immersion temperature is 20°C. Rinse the surface of the immersed aluminum alloy with running deionized water for 30 seconds to obtain a cleaned aluminum alloy.

[0050] Example 4

[0051] The difference from Example 1 is that the mass ratio of etchant to surfactant is 100:10, resulting in an aluminum alloy cleaning solution and a cleaned aluminum alloy.

[0052] Example 5

[0053] The difference from Example 1 is that the mass ratio of etchant to surfactant is 100:1, resulting in an aluminum alloy cleaning solution and a cleaned aluminum alloy.

[0054] Example 6

[0055] The difference from Example 1 is that the mass ratio of etchant to corrosion inhibitor is 100:0.1, resulting in an aluminum alloy cleaning solution and a cleaned aluminum alloy.

[0056] Example 7

[0057] The difference from Example 1 is that the mass ratio of etchant to corrosion inhibitor is 100:0.3, resulting in an aluminum alloy cleaning solution and a cleaned aluminum alloy.

[0058] Example 8

[0059] The difference from Example 1 is that the mass ratio of corrosion inhibitor (cerium nitrate and imidazoline) to surfactant sodium dodecylbenzenesulfonate is 0.2:1, resulting in an aluminum alloy cleaning solution and a cleaned aluminum alloy.

[0060] Example 9

[0061] The difference from Example 1 is that the mass ratio of corrosion inhibitor (cerium nitrate and imidazoline) to surfactant sodium dodecylbenzenesulfonate is 0.1:1, resulting in an aluminum alloy cleaning solution and a cleaned aluminum alloy.

[0062] Example 10

[0063] The difference from Example 1 is that the etching agent is a combination of tartaric acid and hydrofluoric acid, with a mass ratio of tartaric acid to hydrofluoric acid of 0.1:1, ultimately yielding an aluminum alloy cleaning solution and a cleaned aluminum alloy.

[0064] Example 11

[0065] The difference from Example 1 is that the etching agent is a combination of tartaric acid and hydrofluoric acid, with a mass ratio of tartaric acid to hydrofluoric acid of 0.05:1, ultimately yielding an aluminum alloy cleaning solution and a cleaned aluminum alloy.

[0066] Example 12

[0067] The difference from Example 1 is that the corrosion inhibitor is a combination of sodium citrate and cerium nitrate, with a mass ratio of sodium citrate to cerium nitrate of 6:1, ultimately yielding an aluminum alloy cleaning solution and the cleaned aluminum alloy.

[0068] Example 13

[0069] The difference from Example 1 is that the corrosion inhibitor is a combination of sodium citrate and cerium nitrate, with a mass ratio of sodium citrate to cerium nitrate of 3:1, ultimately yielding an aluminum alloy cleaning solution and the cleaned aluminum alloy.

[0070] Example 14

[0071] The difference from Example 1 is that the surfactant is a combination of isomeric alcohol glucoside and sodium dodecylbenzenesulfonate, with a mass ratio of isomeric alcohol glucoside to sodium dodecylbenzenesulfonate of 1.5:1, ultimately yielding an aluminum alloy cleaning solution and the cleaned aluminum alloy.

[0072] Example 15

[0073] The difference from Example 1 is that the surfactant is a combination of isomeric alcohol glucoside and sodium dodecylbenzenesulfonate, with a mass ratio of isomeric alcohol glucoside to sodium dodecylbenzenesulfonate of 0.5:1, ultimately yielding an aluminum alloy cleaning solution and the cleaned aluminum alloy.

[0074] Example 16

[0075] The difference from Example 1 is that the etching agent is a combination of tartaric acid and hydrofluoric acid, with a mass ratio of tartaric acid to hydrofluoric acid of 0.4:1; the etching inhibitor is a combination of sodium citrate and cerium nitrate, with a mass ratio of sodium citrate to cerium nitrate of 8:1; and the surfactant is a combination of isomeric alcohol glucoside and sodium dodecylbenzenesulfonate, with a mass ratio of isomeric alcohol glucoside to sodium dodecylbenzenesulfonate of 2:1. Finally, an aluminum alloy cleaning solution and a cleaned aluminum alloy are obtained.

[0076] Comparative Example 1

[0077] The difference from Example 1 is that the aluminum alloy surface cleaning solution is replaced with the cleaning solution in CN 118407055 A, and the final cleaned aluminum alloy is obtained.

[0078] Comparative Example 2

[0079] The difference from Example 1 is that the surface of the impregnated aluminum alloy is not rinsed, resulting in a cleaned aluminum alloy.

[0080] Comparative Example 3

[0081] The difference from Example 1 is that no etchant is added to the aluminum alloy surface cleaning solution, resulting in a cleaned aluminum alloy.

[0082] Comparative Example 4

[0083] The difference from Example 1 is that no corrosion inhibitor is added to the aluminum alloy surface cleaning solution, resulting in a cleaned aluminum alloy.

[0084] Comparative Example 5

[0085] The difference from Example 1 is that no surfactant is added to the aluminum alloy surface cleaning solution, resulting in a cleaned aluminum alloy.

[0086] Comparative Example 6

[0087] The difference from Example 1 is that no additives are added to the aluminum alloy surface cleaning solution, resulting in a cleaned aluminum alloy.

[0088] Comparative Example 7

[0089] The difference from Example 1 is that the amount of etchant ammonium bifluoride is 5 parts, the amount of cerium nitrate inhibitor is 0.5 parts, the amount of imidazoline inhibitor is 0.5 parts, the amount of sodium dodecylbenzene sulfonate surfactant is 0.05 parts, the amount of glycerol additive is 0.1 parts, and the amount of water solvent is 80 parts, finally obtaining the cleaned aluminum alloy.

[0090] Comparative Example 8

[0091] The difference from Example 1 is that the mass ratio of the etchant ammonium bifluoride to the surfactant sodium dodecylbenzenesulfonate is 100:0.2, resulting in an aluminum alloy cleaning solution and a cleaned aluminum alloy.

[0092] Comparative Example 9

[0093] The difference from Example 1 is that the mass ratio of the etchant ammonium bifluoride to the corrosion inhibitor (cerium nitrate and imidazoline) is 100:0.01, resulting in an aluminum alloy cleaning solution and a cleaned aluminum alloy.

[0094] Test method:

[0095] The aluminum alloys used in the examples and comparative examples were dried after cleaning and then subjected to anodizing and coating processes to prepare CTP plates. The number of defects such as blue spots and scratches on the surfaces of the cleaned aluminum alloys and CTP plates was observed and counted using an optical microscope, with an inspection area of ​​0.5 μm. 2 .

[0096] The original aluminum alloy strips in the above embodiments and comparative examples had 7 to 20 surface defects without cleaning treatment. After being directly subjected to processes such as anodizing and coating, the CTP plates prepared had 6 to 14 surface defects.

[0097] The definition of qualified aluminum alloy cleaning is: the number of surface defects of the aluminum alloy after cleaning is ≤5. The qualified cleaning rate of the aluminum alloy after cleaning is calculated as: (number of qualified aluminum alloys after cleaning / total number of aluminum alloys after cleaning) × 100%.

[0098] The definition of a qualified CTP board is: the number of surface defects on the CTP board is ≤4. The qualified rate of CTP board preparation is calculated as the number of qualified CTP boards / the total number of CTP boards × 100%.

[0099] The test results are shown in Table 1.

[0100] Table 1

[0101]

[0102] The results above show that, using the cleaning solution of this application, the cleaning pass rate of both the aluminum alloy and the CTP plate can reach over 98%. Therefore, the aluminum alloy surface cleaning solution and method provided in this application can efficiently clean residual oil, aluminum shavings, and impurities from the surface of aluminum alloy strips, and significantly smooth out structural defects such as scratches, resulting in a clean and uniform aluminum alloy strip surface. After cleaning, the aluminum alloy undergoes processes such as anodizing and coating to prepare CTP plates, resulting in a significant reduction in the number of surface defects on the CTP plates, thereby greatly improving the quality of the CTP plate products.

[0103] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0104] The aluminum alloy surface cleaning solution of this application exhibits excellent stability. By compounding key components such as etchants, corrosion inhibitors, surfactants, and additives, it can not only effectively remove impurities and aluminum shavings adhering to the aluminum alloy surface, but also smooth out surface defects, resulting in a high-quality aluminum alloy surface. This makes it better suited for cleaning the surface of aluminum alloy strips used in CTP plates. Specifically, the etchant's main function is to remove the oxide film and other impurities from the aluminum alloy surface. By etching or dissolving the oxide layer on the aluminum alloy surface, it achieves a clean surface, which is beneficial for subsequent anodizing or coating processes. The corrosion inhibitor can protect the aluminum alloy substrate from excessive corrosion while removing surface impurities. By forming a thin protective film on the aluminum alloy surface, the corrosion inhibitor can prevent or slow down the corrosive effect of the etchant on the aluminum alloy. The surfactant reduces the surface tension of the aluminum alloy surface cleaning solution, enhancing its wettability and penetration on the aluminum alloy surface. Simultaneously, the surfactant can also remove grease and organic dirt from the aluminum alloy surface through emulsification and dispersion, thereby improving the cleaning effect. Additives can optimize the physicochemical properties of aluminum alloy surface cleaning solutions, thereby improving the cleaning effect. Furthermore, the cleaning method of the aluminum alloy surface cleaning solution of this application is simple and applicable to dynamic and continuous aluminum alloy wire production processes, ensuring that aluminum alloy strips have a uniform and clean surface before leaving the factory.

[0105] 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 cleaning fluid for aluminum alloy surfaces, characterized in that, The aluminum alloy surface cleaning solution comprises, by weight, the following components: 10-40 parts of etching agent; 0.02~0.2 parts of corrosion inhibitor; 0.2 to 1.2 parts of surfactant; and 0.5 to 10 parts of the adjuvant; The mass ratio of the etchant to the surfactant is 100:1~10; The mass ratio of the etchant to the corrosion inhibitor is 100:0.1~0.

5.

2. The aluminum alloy surface cleaning solution according to claim 1, characterized in that, The aluminum alloy surface cleaning solution comprises, by weight, the following components: 12 to 30 parts of the etching agent; 0.1 to 0.18 parts of the corrosion inhibitor; 0.2 to 1.2 parts of the surfactant; and 1.2 to 8 parts of the aforementioned adjuvant.

3. The aluminum alloy surface cleaning solution according to claim 1, characterized in that, The etching agent is selected from any one or more of ammonium bifluoride, citric acid, glycolic acid, acetic acid, tartaric acid, nitric acid, sulfuric acid and hydrofluoric acid; when the etching agent is a combination of tartaric acid and hydrofluoric acid, the mass ratio of tartaric acid to hydrofluoric acid is 0.1~0.6:

1.

4. The aluminum alloy surface cleaning solution according to any one of claims 1 to 3, characterized in that, The corrosion inhibitor is an organic corrosion inhibitor and / or an inorganic corrosion inhibitor, wherein the organic corrosion inhibitor is selected from any one or more of Lan826, sodium citrate, glycerol and imidazoline, and the inorganic corrosion inhibitor is cerium nitrate; when the corrosion inhibitor is a combination of sodium citrate and cerium nitrate, the mass ratio of sodium citrate to cerium nitrate is 6~9:

1.

5. The aluminum alloy surface cleaning solution according to any one of claims 1 to 3, characterized in that, The surfactant is a nonionic surfactant and / or anionic surfactant, wherein the nonionic surfactant is selected from any one or more of isooctanol polyoxyethylene ether, alkylphenol polyoxyethylene ether, and isopropyl alcohol glucoside, and the anionic surfactant is sodium dodecylbenzenesulfonate and / or sodium dodecyl sulfate; when the surfactant is a combination of isopropyl alcohol glucoside and sodium dodecylbenzenesulfonate, the mass ratio of isopropyl alcohol glucoside to sodium dodecylbenzenesulfonate is 1.5~3.5:

1.

6. The aluminum alloy surface cleaning solution according to any one of claims 1 to 3, characterized in that, The additives are selected from any one or more of ethylene glycol, glycerol, polyethylene glycol, sodium sulfate, and potassium sodium tartrate.

7. The aluminum alloy surface cleaning solution according to any one of claims 1 to 3, characterized in that, The aluminum alloy surface cleaning solution also includes a solvent, which is water, and the solvent is 40 to 60 parts by weight.

8. A method for preparing the aluminum alloy surface cleaning liquid according to any one of claims 1 to 7, characterized in that, The preparation method includes mixing raw materials including etchant, corrosion inhibitor, surfactant and additive to obtain the aluminum alloy surface cleaning solution.

9. A cleaning method for an aluminum alloy surface cleaning solution, characterized in that, The cleaning method includes: The aluminum alloy is immersed and rinsed in the aluminum alloy surface cleaning solution to obtain the surface-cleaned aluminum alloy. The aluminum alloy surface cleaning solution is the aluminum alloy surface cleaning solution according to any one of claims 1 to 7 or is prepared by the preparation method according to claim 8.

10. The cleaning method according to claim 9, characterized in that, The immersion time is 20~100s, and the immersion temperature is 20~60℃; And / or, the surface of the impregnated aluminum alloy is rinsed with water for 30 to 500 seconds.

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