Method for rapidly preparing white ceramic-imitating anodic oxide film on surface of aluminum alloy at normal temperature
By quickly preparing a white porcelain imitation anodized film on the surface of aluminum alloy at room temperature, including degreasing, pickling, brightening and anodizing steps, the problem of difficulty in forming a pure white porcelain imitation anodized layer in the prior art is solved, and aluminum is realized The pure white decorative oxide film layer on the alloy surface and improve durability.
Patent Information
- Application Number
- CN202411345093.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-01-14
AI Technical Summary
The prior art is difficult to form pure white imitation porcelain anodized layer under the surface of aluminum alloys, especially when the Cu and Si content is high, which makes it difficult to complete anodization, and cannot obtain a selective decorative oxide layer, and commonly used coatings. It is easy to fade and has a short service life.
The method of rapid preparation of white porcelain anodized film on the surface of aluminum alloy at room temperature includes degreasing, pickling, brightening and anodizing steps, and using specific degreasing liquids, pickling liquids, brightening liquids and oxidation liquids, through a single pulse The oxidation power supply is processed to form a white porcelain oxide film.
The formation of a pure white imitation porcelain decorative anodized film layer on the surface of the aluminum alloy is effectively realized, which improves the service life and ensures the durability of the aluminum alloy.
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Figure CN119307994A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of coating technology, and in particular to a method for quickly preparing a white imitation porcelain anodic oxide film on an aluminum alloy surface at room temperature. Background Art
[0002] Aluminum alloys are widely used in daily necessities and portable electronic products due to their excellent formability, processing, corrosion resistance, and light weight. In applications that are in close contact with the human body, not only the durability and safety of the surface must be considered, but also its aesthetics.
[0003] The noble and elegant bright white color often gives people a sense of nobility, elegance and holiness. In the prior art, in order to obtain this noble and elegant bright white effect on the surface of aluminum alloy products, a surface spraying or electroplating method is generally adopted, and a white paint layer is applied on the surface to achieve this high decorative requirement, which causes the problem of easy fading and short service life. The main reason is that aluminum alloy contains elements such as Cu, Fe, Mn, Co, Zn, Ni, etc. The oxides of these elements have a relatively deep color depth, so it is difficult to obtain a pure white imitation porcelain anodized layer under anodizing conditions, especially when the Cu and Si contents are high, because Cu2O and SiO2 easily form conductive oxides, making anodizing difficult to complete, and thus it is even more impossible to obtain a selective decorative oxide layer. Summary of the invention
[0004] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a method for quickly preparing a white porcelain-like anodized film on the surface of an aluminum alloy at room temperature.
[0005] The technical solution of the present invention is as follows:
[0006] The present invention provides a method for rapidly preparing a white imitation porcelain anodic oxide film on the surface of an aluminum alloy at room temperature, comprising:
[0007] Degreasing, degreasing the room temperature aluminum alloy in a degreasing liquid, and washing after degreasing;
[0008] Pickling, pickling the aluminum alloy cleaned after degreasing in a pickling solution to remove oxides on the surface of the aluminum alloy, and cleaning after pickling;
[0009] Brightening, the aluminum alloy cleaned after pickling is brightened in a brightening solution, and then cleaned after the brightening treatment;
[0010] Anodizing: The aluminum alloy that has been cleaned after brightening treatment is anodized in an oxidizing solution to form a film layer, and then cleaned after anodizing;
[0011] Sealing: the aluminum alloy cleaned after anodizing is sealed in a sealing liquid and dried after the sealing.
[0012] Furthermore, in the above-mentioned method for quickly preparing a white porcelain-like anodized film on the surface of an aluminum alloy at room temperature, the degreasing solution includes: NaOH: 5g / L-7g / L, Na2CO3: 10g / L-30g / L, Na2P2O7: 5g / L-10g / L, OP-10: 2mL / L-5mL / L; when degreasing the aluminum alloy, the temperature of the degreasing solution is: 50°C-70°C, the degreasing time is: 3min-5min, and the water temperature during water washing after degreasing is greater than 45°C, and the cleaning time is 3min-5min.
[0013] Furthermore, in the above-mentioned method for quickly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature, the pickling solution comprises: NH4HF2: 15g / L-30g / L, HNO3: 10mL / L-15mL / L, H2SO4: 30mL / L-50mL / L, NaC1: 10g / L-15g / L, hexamethylenetetramine: 0.5g / L-2g / L, H2O: balance. When the pickling solution is used to pickle the degreased aluminum alloy, the temperature of the pickling solution is equal to the room temperature, the pickling time is: 20s-90s, and the water temperature during water washing after pickling is equal to the room temperature, and the cleaning time is 2min-3min.
[0014] Furthermore, in the above-mentioned method for rapid preparation of white imitation porcelain anodized film on the surface of aluminum alloy at room temperature, the brightening liquid includes: H3PO4: 80%, HNO3: 5%, CH3COOH: 15%, cetylpyridinium bromide: 0.02%. When the brightening liquid is used to brighten the surface of the aluminum alloy, the temperature of the brightening liquid is equal to the room temperature, the treatment time of the brightening liquid is 1min-3min, and the water temperature during water washing after the brightening treatment is equal to the room temperature, and the cleaning time is greater than 3min.
[0015] Furthermore, in the above-mentioned method for quickly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature, when anodizing the aluminum alloy, the oxidizing solution used includes: H3PO4: 300mL / L, NH4Al(SO4)2: 3g / L-5g / L, citric acid: 10g / L-15g / L, H3BO3: 5g / L-7g / L, TiOSO4: 1g / L-2g / L, potassium antimony tartrate: 1.5g / L-2g / L, NH4Ce(SO4)2: 2g / L-6g / L, polyethylene glycol 400: 10mL / L-15mL / L, a single-pulse oxidizing power supply is used for treatment during the anodizing process, and the water temperature is equal to the room temperature when washing after the anodizing treatment, and the washing time is: 3min-5min.
[0016] Furthermore, in the above-mentioned method for rapidly preparing a white imitation porcelain anodized film on the surface of aluminum alloy at room temperature, the duty cycle of the single pulse oxidation power supply is 10%-15%, the frequency is 500Hz-700Hz, and the current density is 1.5A / dm 2 -3A / dm 2 , the termination voltage is 100V-150V, the processing time is 8min-15min, and the oxidation liquid temperature is 15℃-45℃.
[0017] Furthermore, in the above-mentioned method for rapidly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature, the oxidizing solution used in the anodizing process is configured as follows:
[0018] Take 1 / 2 of the measured volume of pure water, dissolve the measured H3PO4 and citric acid in it under stirring, cool to room temperature, add NH4Al(SO4)2, NH4Ce(SO4)2, TiOSO4, potassium antimony tartrate respectively and stir to fully dissolve, which is called A solution for use;
[0019] Take 1 / 3 of the measured volume of pure water, fully dissolve the measured H3BO3 in it under stirring, and then stir and dissolve the measured polyethylene glycol 400 in it, which is called liquid B;
[0020] Dissolve liquid B in liquid A while stirring, and add pure water to measure the volume;
[0021] Measure the pH value and adjust the pH to ≤ 3.5 with H3PO4 or H2SO4 or NH3·H2O (40%);
[0022] Control the dissolving temperature between 15-45℃.
[0023] Furthermore, in the above-mentioned method for rapid preparation of white imitation porcelain anodized film on the surface of aluminum alloy at room temperature, the sealing liquid is pure water, the sealing liquid temperature is 85°C-100°C, the sealing time is 30min-60min, and when drying after sealing treatment, high-pressure air is first used for drying, and then drying is carried out. The drying temperature is 120°C-150°C, and the drying time is 15min-30min.
[0024] The main advantages of the technical solution of the present invention are as follows:
[0025] The invention discloses a method for rapidly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature, which comprises the following steps: degreasing the aluminum alloy in a degreasing solution - acid washing to remove oxides on the surface of the aluminum alloy - brightening the pickled aluminum alloy in a brightening solution - anodizing to form a white porcelain oxide film, thereby effectively realizing a pure white imitation porcelain decorative anodized film layer on the surface of the aluminum alloy, while ensuring the durability of the aluminum alloy and improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:
[0027] Figure 1 A schematic flow chart of a method for rapidly preparing a white porcelain-like anodized film on an aluminum alloy surface at room temperature according to the present invention;
[0028] Figure 2 Schematic diagram of the 96h neutral salt spray test results in Example 1. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0030] The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.
[0031] Example 1
[0032] As attached Figure 1 As shown, the embodiment of the present invention provides a method for quickly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature, comprising:
[0033] Degreasing, degreasing the room temperature aluminum alloy in a degreasing liquid, and washing after degreasing;
[0034] Pickling, pickling the aluminum alloy cleaned after degreasing in a pickling solution to remove oxides on the surface of the aluminum alloy, and cleaning after pickling;
[0035] Brightening, the aluminum alloy cleaned after pickling is brightened in a brightening solution, and then cleaned after the brightening treatment;
[0036] Anodizing: The aluminum alloy that has been cleaned after brightening treatment is anodized in an oxidizing solution to form a film layer, and then cleaned after anodizing;
[0037] Sealing: the aluminum alloy cleaned after anodizing is sealed in a sealing liquid and dried after the sealing.
[0038] Furthermore, in the above-mentioned method for rapid preparation of white porcelain-like anodized film on the surface of aluminum alloy at room temperature, the degreasing solution includes: NaOH: 5g / L-7g / L, Na2CO3: 10g / L-30g / L, Na2P2O7: 5g / L-10g / L, OP-10: 2mL / L-5mL / L; when degreasing the aluminum alloy, the temperature of the degreasing solution is: 50℃-70℃, the degreasing time is: 3min-5min, and the water temperature during water washing after degreasing is greater than 45℃, and the cleaning time is 3min-5min.
[0039] Preferably, NaOH: 7g / L, Na2CO3: 12g / L, Na2P2O7: 10g / L, OP-10: 3mL / L, the temperature of the degreasing liquid is: 60±5℃, and the degreasing time is: 3min-4min, which can achieve the best degreasing effect.
[0040] Furthermore, in the above-mentioned method for quickly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature, the pickling solution includes: NH4HF2: 15g / L-30g / L, HNO3: 10mL / L-15mL / L, H2SO4: 30mL / L-50mL / L, NaC1: 10g / L-15g / L, hexamethylenetetramine: 0.5g / L-2g / L, H2O: balance. When the pickling solution is used to pickle the degreased aluminum alloy, the temperature of the pickling solution is equal to the room temperature, the pickling time is: 20s-90s, and the water temperature during water washing after pickling is equal to the room temperature, and the cleaning time is 2min-3min.
[0041] Preferably, NH4HF2: 20g / L, HNO3: 10mL / L, H2SO4: 30mL / L, NaC1: 10g / L, hexamethylenetetramine: 1g / L, H2O: balance, the temperature of the pickling solution is equal to the room temperature, and the pickling time is: 50s-70s, which can achieve the best pickling effect.
[0042] Furthermore, in the above-mentioned method for rapid preparation of white imitation porcelain anodized film on the surface of aluminum alloy at room temperature, the brightening liquid includes: H3PO4: 80%, HNO3: 5%, CH3COOH: 15%, cetylpyridinium bromide: 0.02%. When the brightening liquid is used to brighten the surface of the aluminum alloy, the temperature of the brightening liquid is equal to the room temperature, the treatment time of the brightening liquid is 1min-3min, and the water temperature during water washing after the brightening treatment is equal to the room temperature, and the cleaning time is greater than 3min.
[0043] Furthermore, in the above-mentioned method for quickly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature, when anodizing the aluminum alloy, the oxidizing solution used includes: H3PO4: 300mL / L, NH4Al(SO4)2: 3g / L-5g / L, citric acid: 10g / L-15g / L, H3BO3: 5g / L-7g / L, TiOSO4: 1g / L-2g / L, potassium antimony tartrate: 1.5g / L-2g / L, NH4Ce(SO4)2: 2g / L-6g / L, polyethylene glycol 400: 10mL / L-15mL / L, a single-pulse oxidizing power supply is used for treatment during the anodizing process, and the water temperature is equal to the room temperature when washing after the anodizing treatment, and the washing time is: 3min-5min.
[0044] Preferably, H3PO4: 300mL / L, NH4Al(SO4)2: 3g / L, citric acid: 12g / L, H3BO3: 5g / L, TiOSO4: 1g / L, potassium antimony tartrate: 1.5g / L, NH4Ce(SO4)2: 3g / L, polyethylene glycol 400: 10mL / L, which can achieve the best anodizing effect.
[0045] Specifically, the principle of the anodizing process is: H3PO4 and SO4 2- It is the basic environmental substance of the oxide film. For 6 series aluminum alloys containing Cu, Fe, Cr, and Ni ions, the film formed in the mixed acid mainly composed of H3PO4 and supplemented by H2SO4 is more transparent, especially under the action of pulsed anodic oxidation current, this trend is more obvious; the tartaric acid and oxalic acid ionized from potassium antimony tartrate or potassium titanium oxalate are mixed with H3PO4 and H2SO4, which broadens the temperature range of anodic oxidation, so that anodic oxidation can quickly form an oxide film within the room temperature range; and Ti 3+ , Sb 2+ 、Ce 3+ Ions are white colorants. Due to the different molecular radii of their oxides, when they are mixed and half-filled in the gaps of the Al2O3 film, they can form piles of different components and contents, which increases the whiteness of the film. The reaction formula is: The anodizing process is accompanied by a violent exothermic reaction. The size of the formed r-Al2O3 is about 0.1μm, which belongs to the nanoscale range. It not only increases the hardness of the film, but also improves the whiteness of the film. Ce2O3, SbO2, and TiO2 in NH4Ce(SO4)2, potassium antimony tartrate, and potassium titanium oxalate have the same effect. On the one hand, citric acid has the effect of stabilizing the metal ions in the solution through complexation reaction. On the other hand, the orderly release of metal ions under the action of complexing agent can play a role similar to brightener, which has a significant effect on the gloss and milky white color of the film, and also has a buffering effect on the pH value of the bath solution. The role of H3BO3 is bath buffer, Al 3+ Ion stabilizer, film white conversion agent; polyethylene glycol 400 acts as a dispersant and brightener.
[0046] Furthermore, in the above-mentioned method for rapidly preparing a white imitation porcelain anodized film on the surface of aluminum alloy at room temperature, the duty cycle of the single pulse oxidation power supply is 10%-15%, the frequency is 500Hz-700Hz, and the current density is 1.5A / dm 2 -3A / dm 2 The termination voltage is 100V-150V. Within this range, the higher the voltage, the better the whiteness of the film. The processing time is 8min-15min. The temperature of the oxidizing liquid is 15℃-45℃. Within this range, the lower the temperature of the oxidizing liquid, the faster the film is formed.
[0047] In some optional implementations of this embodiment, when anodizing the aluminum alloy, the electrical parameters shown in Table 1 below may be used for control;
[0048] Table 1: Anodizing electronic control parameters
[0049]
[0050] Among them, the entire anodizing process is divided into two stages. Serial numbers 1-3 in Table 1 belong to the constant current control stage under the highest limited protection voltage. In this stage, the basic oxide film is formed and thickened under the condition of step-by-step increase in current density; the second stage is stage 4. In this stage, the voltage maintains constant voltage operation after reaching the set maximum value, and the current density gradually decreases. In this stage, the oxide film thickness no longer increases, and the consumed electric energy is mainly used to fill the oxide film gaps, so that the oxide film density increases, the porosity decreases, and the oxide film becomes fuller and smoother.
[0051] Furthermore, in the above-mentioned method for rapidly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature, the oxidizing solution used in the anodizing process is configured as follows:
[0052] Take 1 / 2 of the measured volume of pure water, dissolve the measured H3PO4 and citric acid in it under stirring, cool to room temperature, add NH4Al(SO4)2, NH4Ce(SO4)2, TiOSO4, potassium antimony tartrate respectively and stir to fully dissolve, which is called A solution for use;
[0053] Take 1 / 3 of the measured volume of pure water, fully dissolve the measured H3BO3 in it under stirring, and then stir and dissolve the measured polyethylene glycol 400 in it, which is called liquid B;
[0054] Dissolve liquid B in liquid A while stirring, and add pure water to measure the volume;
[0055] Measure the pH value and adjust the pH to ≤ 3.5 with H3PO4 or H2SO4 or NH3·H2O (40%);
[0056] Control the dissolving temperature between 15-45℃.
[0057] Furthermore, in the above-mentioned method for rapid preparation of white porcelain-like anodized film on the surface of aluminum alloy at room temperature, pure water is used as the sealing liquid, the sealing liquid temperature is 85°C-100°C, the sealing time is 30min-60min, and when drying after sealing treatment, high-pressure air is first used for drying, and then drying is carried out. The drying temperature is 120°C-150°C, and the drying time is 15min-30min.
[0058] The absorbance of the anodic oxide film was tested, as shown in Table 2;
[0059] Table 2: Absorbance L(a+b) value
[0060]
[0061] The thickness of the anodic oxide film was tested, as shown in Table 3;
[0062] Table 3: Film thickness
[0063]
[0064] The corrosion resistance of the anodic oxide film is tested, such as Figure 2 As shown, a neutral salt spray test is used and the test duration is 96 hours.
[0065] In summary, compared with the prior art, the method for preparing a conductive oxide film on the surface of an aluminum alloy according to the embodiment of the present invention has the following advantages and beneficial effects:
[0066] The invention discloses a method for rapidly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature, which comprises the following steps: degreasing the aluminum alloy in a degreasing solution - acid washing to remove oxides on the surface of the aluminum alloy - brightening the pickled aluminum alloy in a brightening solution - anodizing to form a white porcelain oxide film, thereby effectively realizing a pure white imitation porcelain decorative anodized film layer on the surface of the aluminum alloy, while ensuring the durability of the aluminum alloy and improving the service life.
[0067] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.
[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for rapidly preparing a white porcelain-like anodized film on the surface of an aluminum alloy at room temperature, characterized in that: include: Degreasing, degreasing the room temperature aluminum alloy in a degreasing liquid, and washing after degreasing; Pickling, pickling the aluminum alloy cleaned after degreasing in a pickling solution to remove oxides on the surface of the aluminum alloy, and cleaning after pickling; Brightening, the aluminum alloy cleaned after pickling is brightened in a brightening solution, and then cleaned after the brightening treatment; Anodizing: The aluminum alloy that has been cleaned after brightening treatment is anodized in an oxidizing solution to form a film layer, and then cleaned after anodizing; Sealing: sealing the cleaned aluminum alloy after anodizing in a sealing solution, and drying it after sealing to complete the preparation of the white porcelain-like anodized film.
2. The method for rapidly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature according to claim 1, characterized in that: The degreasing liquid includes: NaOH: 5g / L-7g / L, Na2CO3: 10g / L-30g / L, Na2P2O7: 5g / L-10g / L, OP-10: 2mL / L-5mL / L; when degreasing the aluminum alloy, the temperature of the degreasing liquid is: 50℃-70℃, the degreasing time is: 3min-5min, and the water temperature during water washing after degreasing is greater than 45℃, and the cleaning time is 3min-5min.
3. The method for rapidly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature according to claim 1, characterized in that: The pickling solution comprises: NH4HF2: 15g / L-30g / L, HNO3: 10mL / L-15mL / L, H2SO4: 30mL / L-50mL / L, NaC1: 10g / L-15g / L, hexamethylenetetramine: 0.5g / L-2g / L, and H2O: balance. When the pickling solution is used to pickle the degreased aluminum alloy, the temperature of the pickling solution is equal to the room temperature, the pickling time is: 20s-90s, and the water temperature during water washing after pickling is equal to the room temperature, and the cleaning time is 2min-3min.
4. The method for rapidly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature according to claim 1, characterized in that: The brightening liquid comprises: H3PO4: 80%, HNO3: 5%, CH3COOH: 15%, and cetylpyridinium bromide: 0.02%. When the brightening liquid is used to perform brightening treatment on the surface of the aluminum alloy, the temperature of the brightening liquid is equal to the room temperature, the treatment time of the brightening liquid is 1min-3min, and the water temperature during water washing after the brightening treatment is equal to the room temperature, and the cleaning time is greater than 3min.
5. The method for rapidly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature according to claim 1, characterized in that: When anodizing aluminum alloy, the oxidizing solution used includes: H3PO4: 300mL / L, NH4Al(SO4)2: 3g / L-5g / L, citric acid: 10g / L-15g / L, H3BO3: 5g / L-7g / L, TiOSO4: 1g / L-2g / L, potassium antimony tartrate: 1.5g / L-2g / L, NH4Ce(SO4)2: 2g / L-6g / L, polyethylene glycol 400: 10mL / L-15mL / L. A single pulse oxidation power supply is used for treatment during the anodizing process, and the water temperature is equal to the room temperature when washing after anodizing. The rinsing time is: 3min-5min.
6. The method for rapidly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature according to claim 5, characterized in that: The single pulse oxidation power supply has a duty cycle of 10%-15%, a frequency of 500Hz-700Hz, and a current density of 1.5A / dm 2 -3A / dm 2 , the termination voltage is 100V-150V, the processing time is 8min-15min, and the oxidation liquid temperature is 15℃-45℃.
7. The method for rapidly preparing a white imitation porcelain anodized film on the surface of an aluminum alloy at room temperature according to claim 5, characterized in that: The configuration method of the oxidizing solution used in the anodizing process is: Take 1 / 2 of the measured volume of pure water, dissolve the measured H3PO4 and citric acid in it under stirring, cool to room temperature, add NH4Al(SO4)2, NH4Ce(SO4)2, TiOSO4, potassium antimony tartrate respectively and stir to fully dissolve, which is called A solution for use; Take 1 / 3 of the measured volume of pure water, fully dissolve the measured H3BO3 in it under stirring, and then stir and dissolve the measured polyethylene glycol 400 in it, which is called liquid B; Dissolve liquid B in liquid A while stirring, and add pure water to measure the volume; Measure the pH value and adjust the pH to ≤ 3.5 with H3PO4 or H2SO4 or NH3·H2O (40%); Control the dissolving temperature between 15-45℃.
8. The method for rapidly preparing a white imitation porcelain anodic oxide film on the surface of an aluminum alloy at room temperature according to claim 1, characterized in that: The sealing liquid is pure water, the sealing liquid temperature is 85℃-100℃, the sealing time is 30min-60min, and when drying after the sealing treatment, high-pressure air is first used for drying, and then drying is performed. The drying temperature is 120℃-150℃, and the drying time is 15min-30min.