A color fixing agent for aluminum alloy anodic oxide film and a preparation method thereof

Abstract

The present disclosure relates to the technical field of sealing technology of aluminum alloy anodic oxidation film, in particular to a color fixing agent for aluminum alloy anodic oxidation film and a preparation method thereof; 150 parts by weight of the color fixing agent for aluminum alloy anodic oxidation film comprises the following components by weight: 15-25 parts by weight of organic acid, 1-3 parts by weight of surfactant, 0.1-1 part by weight of corrosion inhibitor, 0.1-1 part by weight of accelerator, 1-5 parts by weight of pH value regulator, 2-10 parts by weight of color fixing aid, 20-40 parts by weight of acetone; the balance is deionized water. The color fixing agent for aluminum alloy anodic oxidation film has good color fixing capacity and corrosion resistance.

Description

Technical Field

[0001] This disclosure relates to the field of sealing technology for aluminum alloy anodic oxide films, specifically to a fixing agent for aluminum alloy anodic oxide films and its preparation method. Background Technology

[0002] Aluminum alloys are increasingly used in many fields such as 3C industry, building materials, transportation, and electronics due to their advantages of abundant reserves, light weight, good thermal conductivity, good ductility, and corrosion resistance. To improve the corrosion resistance of aluminum alloys, the industry widely uses anodizing to enhance the performance of aluminum materials. To meet decorative requirements, aluminum alloys need to be dyed or electrolytically colored after anodizing. However, electrolytic coloring offers limited color options, so most 3C products on the market currently use anodizing.

[0003] After anodizing, aluminum and aluminum alloy workpieces need to be sealed. Currently, the main color-fixing solutions on the market are using color-fixing agents or cobalt salt pre-sealing solutions. The former contains formaldehyde, and the latter contains heavy metal salts such as cobalt salt, which are harmful to the environment and human health, and the color-fixing effect is not ideal. Therefore, there is an urgent need to develop a new type of color-fixing agent for aluminum alloy anodized films. Summary of the Invention

[0004] This disclosure provides a fixing agent for aluminum alloy anodic oxide films and its preparation method, thereby addressing the shortcomings of related technologies.

[0005] According to a first aspect of the present disclosure, a fixing agent for aluminum alloy anodized films is provided, wherein 150 parts by weight of the fixing agent for aluminum alloy anodized films comprises the following components in parts by weight:

[0006] 15-25 parts by weight of organic acid, 1-3 parts by weight of surfactant, 0.1-1 parts by weight of corrosion inhibitor, 0.1-1 parts by weight of accelerator, 1-5 parts by weight of pH adjuster, 2-10 parts by weight of color-fixing agent, 20-40 parts by weight of acetone; the balance being deionized water; and,

[0007] The compounds in the organic acids, surfactants, corrosion inhibitors, accelerators, and pH adjusters do not contain phosphate groups or phosphate ester groups.

[0008] In one aspect of this disclosure, 150 parts by weight of a fixing agent for anodized aluminum alloy films comprises the following components in parts by weight:

[0009] 10-15 parts by weight of organic acid, 1.5-2.5 parts by weight of surfactant, 0.5-1 parts by weight of corrosion inhibitor, 0.5-1 parts by weight of accelerator, 2-3 parts by weight of pH adjuster, 3-8 parts by weight of color fixing agent, 35-40 parts by weight of acetone; the balance is deionized water.

[0010] In one aspect of the embodiments of this disclosure, the organic acid is selected from at least one of citric acid, tartaric acid, malic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, itaconic acid, maleic acid, fumaric acid, glycolic acid, glyceric acid, and levulinic acid.

[0011] In one aspect of the embodiments of this disclosure, specifically, the organic acid is selected from any one of the following combinations: tartaric acid and citric acid, tartaric acid and itaconic acid, tartaric acid and fumaric acid, and citric acid and fumaric acid.

[0012] In one aspect of the embodiments of this disclosure, the surfactant is selected from at least one of fatty alcohol polyoxyethylene ether compounds, Tween compounds, fatty acid polyoxyethylene ester compounds, alkyl glycoside compounds, sodium dodecylbenzene sulfonate, alcohol ether carboxylates, sodium diisooctyl succinate sulfonate, cocamidopropyl betaine, and alkyl dimethylamine oxide.

[0013] In one aspect of the embodiments of this disclosure, preferably, the surfactant is selected from any one of AEO-9, AEO-10, AEO-12, Tween-20, Tween-40, Tween-60, Tween-80, polyethylene glycol laurate, polyethylene glycol distearate, sodium dodecylbenzene sulfonate, sodium diisooctyl succinate sulfonate, and cocamidopropyl betaine.

[0014] In one aspect of the embodiments of this disclosure, the corrosion inhibitor is selected from at least one of benzotriazole and its derivatives, sodium benzoate and its derivatives, nitrogen-containing heterocyclic carboxylates, amide-carboxylic acid compounds, and alkynol compounds.

[0015] In one aspect of the embodiments of this disclosure, preferably, the corrosion inhibitor is selected from any one of benzotriazole, carboxybenzotriazole, sodium benzoate, sodium cinnamate, and sodium nicotinate.

[0016] In one aspect of the embodiments of this disclosure, the accelerator is selected from at least one of ammonium formate, ammonium acetate, ammonium lactate, ammonium citrate, monoethanolamine, diethanolamine, triethanolamine, N-methyldiethanolamine, 2-amino-2-methyl-1-propanol, acetamide, N-methylacetamide, and sorbitol.

[0017] In one aspect of the embodiments of this disclosure, preferably, the accelerator is selected from any one of ammonium acetate, ammonium lactate, ammonium citrate, diethanolamine, triethanolamine, and acetamide.

[0018] In one aspect of this disclosure, the pH adjuster is selected from ammonium bicarbonate, sodium bicarbonate, or ammonia.

[0019] In one aspect of this disclosure, the color-fixing agent is selected from a combination of the following components (1) and (2):

[0020] (1) At least one of zirconium acetylacetonate, copper acetylacetonate, iron acetylacetonate, nickel acetylacetonate, cobalt acetylacetonate, manganese acetylacetonate, chromium acetylacetonate, zinc acetylacetonate, and calcium acetylacetonate;

[0021] (2) At least one of polyaluminum chloride, polyaluminum ferric chloride, polyaluminum ferric chloride sulfate, and polyaluminum silicate chloride.

[0022] In one aspect of this disclosure, component (2) comprises polyaluminum ferric chloride sulfate; the polyaluminum ferric chloride sulfate is prepared by the following steps:

[0023] Step 1-a: Add Al2(SO4)3·18H2O to the reaction vessel, then add water and stir. After it is completely dissolved, add anhydrous AlCl3 and stir at room temperature for 30-60 minutes.

[0024] Step 2-a: Add FeCl3 solution to the solution and continue stirring at room temperature for 30-60 minutes;

[0025] Step 3-a: Add Na2CO3 solution to the solution and continue stirring at room temperature for 30-60 min; then raise the temperature to 40℃-50℃ and react for 1-3 h; after the reaction is completed, cool to room temperature, pour out the reactants, and dry to obtain the polyaluminum ferric sulfate.

[0026] In one aspect of this disclosure, the polymeric aluminum silicate is prepared by the following steps:

[0027] Step 1-b: Add Na2SiO3·9H2O to the reaction vessel, then add water and stir. After it is completely dissolved, add dilute HCl to adjust the pH to 3-3.5; stir for 10-20 minutes; then let it stand for 15-30 minutes to mature.

[0028] Step 2-b: Add AlCl3·6H2O to the reaction vessel, then add water and stir for 10-20 min, and let it stand for 15-30 min to mature; wherein, the molar ratio of AlCl3·6H2O and Na2SiO3·9H2O used is 3:2;

[0029] Step 3-b: Slowly add the solution obtained in step 2-b to the solution obtained in step 1-b, then heat to 70℃-80℃ and stir for 45-90 min; after the reaction is completed, pour Na2CO3 solution into the reactants, then wait for the reaction solution to cool naturally to room temperature, collect the reactants, and dry them to obtain the polymeric aluminum silicate chloride.

[0030] In one aspect of the present disclosure, in the color-fixing agent, the mass ratio of component (2) to component (1) is selected from (3-7):1.

[0031] In one aspect of this disclosure, the color-fixing agent is selected from a combination of the following components (1) and (2):

[0032] (1) At least one of zirconium acetylacetonate, copper acetylacetonate, iron acetylacetonate, nickel acetylacetonate, cobalt acetylacetonate, manganese acetylacetonate, chromium acetylacetonate, zinc acetylacetonate, and calcium acetylacetonate;

[0033] (2) Any one of polyaluminum chloride, polyaluminum ferric chloride, polyaluminum ferric chloride sulfate, and polyaluminum silicate chloride.

[0034] In one aspect of this disclosure, preferably, the color-fixing agent is selected from a combination of the following components (1) and (2):

[0035] (1) At least one of zirconium acetylacetonate, copper acetylacetonate, and nickel acetylacetonate;

[0036] (2) Any one of polyaluminum chloride, polyaluminum chloride sulfate, and polyaluminum silicate chloride.

[0037] In one aspect of the embodiments of this disclosure, more preferably, the color-fixing agent is selected from a combination of the following components (1) and (2):

[0038] (1) Zirconium acetylacetonate and / or nickel acetylacetonate;

[0039] (2) Any one of polyaluminum chloride, polyaluminum chloride sulfate, and polyaluminum silicate chloride.

[0040] In one aspect of the embodiments of this disclosure, specifically, the color-fixing agent comprises zirconium acetylacetonate and one of polyaluminum chloride and polyaluminum silicate.

[0041] In one aspect of this disclosure, specifically, 150 parts by weight of the fixing agent for anodized aluminum alloy films comprises the following components in parts by weight:

[0042] 12 parts by weight of organic acid, 2 parts by weight of surfactant, 1 part by weight of corrosion inhibitor, 1 part by weight of accelerator, 2 parts by weight of pH adjuster, 7 parts by weight of polyaluminum silicate or polyaluminum chloride, 40 parts by weight of acetone, and the balance being deionized water.

[0043] According to a second aspect of the present disclosure, a method for providing a fixing agent for anodized aluminum alloy films is provided, the method comprising: dissolving component (1) of the fixing agent in acetone; dissolving component (2), organic acid, surfactant, corrosion inhibitor, accelerator, and pH adjuster of the fixing agent in water; and then mixing the aqueous solution and the acetone solution to obtain the fixing agent for anodized aluminum alloy films.

[0044] Compared with the prior art, the beneficial effects of this disclosure are:

[0045] This disclosure provides a fixing agent for aluminum alloy anodized films and its preparation method; 150 parts by weight of the fixing agent for aluminum alloy anodized films comprises the following components in parts by weight: 15-25 parts by weight of organic acid, 1-3 parts by weight of surfactant, 0.1-1 parts by weight of corrosion inhibitor, 0.1-1 parts by weight of accelerator, 1-5 parts by weight of pH adjuster, 2-10 parts by weight of fixing aid, 20-40 parts by weight of acetone; the balance is deionized water. The fixing aid is selected from a combination of the following components (1) and components (2): (1) at least one of zirconium acetylacetonate, copper acetylacetonate, iron acetylacetonate, nickel acetylacetonate, cobalt acetylacetonate, manganese acetylacetonate, chromium acetylacetonate, zinc acetylacetonate, and calcium acetylacetonate; (2) at least one of polyaluminum chloride, polyaluminum ferric chloride, polyaluminum ferric chloride sulfate, and polyaluminum silicate chloride. The fixing agent for aluminum alloy anodized films has both good fixing ability and corrosion resistance. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The embodiments described herein are illustrative in nature and are used to provide a basic understanding of this application. The embodiments of this application should not be construed as limiting this application.

[0047] For the sake of brevity, this article only discloses a few specific numerical ranges. However, any lower limit can be combined with any upper limit to form an unspecified range; and any lower limit can be combined with other lower limits to form an unspecified range, just as any upper limit can be combined with any other upper limit to form an unspecified range. Furthermore, each individually disclosed point or single value can itself serve as a lower or upper limit and be combined with any other point or single value or with other lower or upper limits to form an unspecified range.

[0048] In this disclosure, after fixing with the fixing agent provided in this disclosure, a sealing agent containing nickel salt can be used for sealing.

[0049] The present disclosure is further illustrated below with reference to embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the disclosure.

[0050] Examples and comparative examples:

[0051] Example 1:

[0052] 7 parts by weight of polyaluminum chloride were provided as a component (2) of the fixing agent in Example 1; 1 part by weight of zirconium acetylacetonate was provided as a component (1) of the fixing agent in Example 1; 1 part by weight of zirconium acetylacetonate was dissolved in 40 parts by weight of acetone solution; 12 parts by weight of organic acid (8 parts by weight of tartaric acid + 4 parts by weight of itaconic acid), 2 parts by weight of surfactant (sodium dodecylbenzenesulfonate), 1 part by weight of corrosion inhibitor (sodium benzoate), 1 part by weight of accelerator (ammonium citrate), 2 parts by weight of pH adjuster (ammonium bicarbonate) and 7 parts by weight of polyaluminum chloride were sequentially added to 84 parts by weight of deionized water; then the aqueous solution and acetone solution were mixed to obtain the fixing agent solution of Example 1.

[0053] Example 2:

[0054] Eight parts by weight of polyaluminum chloride were provided as the fixing agent in Example 2; 12 parts by weight of organic acid (8 parts by weight of tartaric acid + 4 parts by weight of itaconic acid), 2 parts by weight of surfactant (sodium dodecylbenzenesulfonate), 1 part by weight of corrosion inhibitor (sodium benzoate), 1 part by weight of accelerator (ammonium citrate), 2 parts by weight of pH adjuster (ammonium bicarbonate) and 8 parts by weight of polyaluminum chloride were added sequentially to 124 parts by weight of deionized water; then the aqueous solution and acetone solution were mixed to obtain the fixing agent solution of Example 2.

[0055] The main difference between Example 2 and Example 1 is that the fixing agent in Example 2 does not contain zirconium acetylacetone.

[0056] Example 3:

[0057] One part by weight of zirconium acetylacetonate was provided as the fixing agent in Example 3; one part by weight of zirconium acetylacetonate was dissolved in 40 parts by weight of acetone solution; 12 parts by weight of organic acid (8 parts by weight of tartaric acid + 4 parts by weight of itaconic acid), 2 parts by weight of surfactant (sodium dodecylbenzenesulfonate), 1 part by weight of corrosion inhibitor (sodium benzoate), 1 part by weight of accelerator (ammonium citrate), and 2 parts by weight of pH adjuster (ammonium bicarbonate) were added sequentially to 91 parts by weight of deionized water; then the aqueous solution and acetone solution were mixed to obtain the fixing agent solution of Example 3.

[0058] The main difference between Example 3 and Example 1 is that the color-fixing agent in Example 3 does not contain polyaluminum chloride.

[0059] Example 4:

[0060] Add 9.5 parts by weight of Al2(SO4)3·18H2O to the reaction vessel, then add 23 parts by weight of water and stir until completely dissolved. Then add 3 parts by weight of anhydrous AlCl3 and stir at room temperature for 30 min. Then add FeCl3 solution (3 parts by weight of FeCl3 dissolved in 3 parts by weight of water) to the solution and continue stirring at room temperature for 30 min. Then add Na2CO3 solution (1.5 parts by weight of anhydrous Na2CO3 dissolved in 6 parts by weight of water) to the solution and continue stirring at room temperature for 30 min. Then raise the temperature to 45℃ and react for 2 h. After the reaction is completed, cool to room temperature, pour off the reactants, and dry to obtain polyaluminum ferric chloride sulfate.

[0061] 7 parts by weight of polyaluminum ferric chloride sulfate were provided as component (2) of the fixing agent in Example 4; 1 part by weight of zirconium acetylacetonate was provided as component (1) of the fixing agent in Example 2; 1 part by weight of zirconium acetylacetonate was dissolved in 40 parts by weight of acetone solution; 12 parts by weight of organic acid (8 parts by weight of tartaric acid + 4 parts by weight of itaconic acid), 2 parts by weight of surfactant (sodium dodecylbenzenesulfonate), 1 part by weight of corrosion inhibitor (sodium benzoate), 1 part by weight of accelerator (ammonium citrate), 2 parts by weight of pH adjuster (ammonium bicarbonate) and 7 parts by weight of polyaluminum ferric chloride sulfate were added sequentially to 84 parts by weight of deionized water; then the aqueous solution and acetone solution were mixed to obtain the fixing agent solution of Example 4.

[0062] The main difference between Example 4 and Example 1 is that Example 4 uses polyaluminum ferric chloride sulfate instead of polyaluminum chloride used in Example 1.

[0063] Example 5:

[0064] Add 4.4 parts by weight of Na2SiO3·9H2O to the reaction vessel, then add 15.6 parts by weight of water and stir. After complete dissolution, add dilute HCl to adjust the pH to 3.2; stir for 15 min; then let stand for 20 min. Add 5.6 parts by weight of AlCl3·6H2O to the reaction vessel, then add 14.4 parts by weight of water and stir for 15 min; then let stand for 20 min. Slowly add the AlCl3 solution dropwise to the Na2SiO3 solution, then heat to 75℃ and stir for 60 min. After the reaction is complete, pour Na2CO3 solution (4 parts by weight of anhydrous Na2CO3 dissolved in 16 parts by weight of water) into the reactants, then wait for the reaction solution to cool naturally to room temperature, collect the reactants, and dry them to obtain polyaluminum silicate chloride.

[0065] 7 parts by weight of polyaluminum silicate chloride were provided as component (2) of the fixing agent in Example 4; 1 part by weight of zirconium acetylacetonate was provided as component (1) of the fixing agent in Example 2; 1 part by weight of zirconium acetylacetonate was dissolved in 40 parts by weight of acetone solution; 12 parts by weight of organic acid (8 parts by weight of tartaric acid + 4 parts by weight of itaconic acid), 2 parts by weight of surfactant (sodium dodecylbenzenesulfonate), 1 part by weight of corrosion inhibitor (sodium benzoate), 1 part by weight of accelerator (ammonium citrate), 2 parts by weight of pH adjuster (ammonium bicarbonate) and 7 parts by weight of polyaluminum silicate chloride were sequentially added to 84 parts by weight of deionized water; then the aqueous solution and acetone solution were mixed to obtain the fixing agent solution of Example 5.

[0066] The main difference between Example 5 and Example 1 is that Example 4 uses polyaluminum silicate chloride instead of the polyaluminum chloride used in Example 1.

[0067] Comparative Example 1:

[0068] 12 parts by weight of organic acid (8 parts by weight of tartaric acid + 4 parts by weight of itaconic acid), 2 parts by weight of surfactant (sodium dodecylbenzenesulfonate), 1 part by weight of corrosion inhibitor (sodium benzoate), 1 part by weight of accelerator (ammonium citrate), and 2 parts by weight of pH adjuster (sodium bicarbonate) were added sequentially to 132 parts by weight of deionized water; after uniform mixing, the fixing agent solution of Comparative Example 1 was obtained.

[0069] Comparative Example 2:

[0070] 12 parts by weight of organic acid (6 parts by weight of citric acid + 6 parts by weight of fumaric acid), 2 parts by weight of surfactant (sodium diisooctyl succinate sulfonate), 1 part by weight of corrosion inhibitor (sodium nicotinate), 1 part by weight of accelerator (diethanolamine), and 2 parts by weight of pH adjuster (sodium bicarbonate) were added sequentially to 132 parts by weight of deionized water; after uniform mixing, the color-fixing agent solution of Comparative Example 2 was obtained.

[0071] Colorfastness test:

[0072] Multiple 6063 aluminum alloy parts of the same specifications were subjected to the same degreasing, water washing, alkaline etching, water washing, chemical polishing, water washing, dust removal, and water washing processes. They were then placed in concentrated sulfuric acid and anodized by electrolysis. After water washing, multiple aluminum alloy workpieces with anodized films on their surfaces were obtained. The aluminum alloy workpieces were then dyed by immersing them in the color-fixing agent solutions of Examples 1-5 and Comparative Examples 1-2 that had been preheated (85°C) for 15 minutes. After immersion, the workpieces were removed from the solution, rinsed quickly with deionized water, and air-dried to obtain the samples of Examples 1-5 and Comparative Examples 1-2.

[0073] The samples from Examples 1-5 and Comparative Examples 1-2 were subjected to boiling water tests and salt spray tests to observe whether the dyed films of Examples 1-5 and Comparative Examples 1-2 showed fading or color difference; the results are shown in Table 1. The boiling water test was conducted according to GB / T12967.6-2022, where the samples of Examples 1-5 and Comparative Examples 1-2 treated with the fixing agent were immersed in boiling water for 2 hours; after immersion, the samples were removed, rinsed with deionized water, and dried, and the state of the dyed film was observed. The salt spray test was conducted according to GB / T12967.3-2022, where the samples of Examples 1-5 and Comparative Examples 1-2 treated with the fixing agent were subjected to a salt spray test; the samples were sprayed using a spray device to allow salt spray to settle on the sample surface (the salt spray was a 5% concentration sodium chloride solution with a pH of 7); after 96 hours, the samples were removed, rinsed with deionized water, and dried, and the state of the dyed film was observed.

[0074] Table 1

[0075]

[0076] Multiple 6063 aluminum alloy parts of the same specifications were subjected to the same degreasing, water washing, alkaline etching, water washing, chemical polishing, water washing, dust removal, and water washing processes. They were then placed in concentrated sulfuric acid and anodized by electrolysis. After water washing, multiple aluminum alloy workpieces with anodized films on their surfaces were obtained. These workpieces were then dyed by immersing them in organic dyes of different colors: blue (L42.3 a-19.7 b-54.9), red (L46.2 a-47.6 b-24.7), and green (L50.1a-34.8 b-18.3). The dyed workpieces were then immersed in the preheated (85°C) fixing agent solutions of Examples 1-5 and Comparative Examples 1-2 for 15 minutes. After immersion, the workpieces were removed from the solution, quickly rinsed with deionized water, and air-dried to obtain samples of Examples 1-5 and Comparative Examples 1-2. The color difference between Examples 1-5 and Comparative Examples 1-2 before and after fixing was tested, and the results are shown in Table 2.

[0077] Table 2

[0078]

[0079] As can be seen, the fixing agents prepared in Examples 1 and 5 have significantly better fixing and corrosion resistance on the surface of dyed aluminum alloy workpieces than those in Examples 2-3 and Comparative Examples 1-2; this is because the dye molecules contain -SO3. - -COO - [Al] groups, while polyaluminum chloride hydrolyzes to produce [Al] 13 O4(OH) 24 ] 7+ A charged substance that can react with -SO3 in dye molecules- -COO - The groups combine to form a chelate precipitate, completing the pre-fixation; while under the fixing conditions (temperature above 80℃), zirconium acetylacetonate... - ligands and [Al] 13 O4(OH) 24 ] 7+ The Al-OH groups at the terminal positions combine to form a Zr-O-Al network, embedding the dye layer; and some of the remaining zirconium ions combine with the -OH groups in the Zr-O-Al network to form an Al-O-Zr barrier layer; thus, it simultaneously achieves good color fixation and corrosion resistance. The corrosion resistance of Example 5 is further superior to that of Example 1 because the polyaluminum silicate also contains abundant Si-OH groups, which can combine with Al-OH and acac... - The ligands form a Zr-Al-O-Si-O-Al-Zr network with a higher degree of cross-linking, which further improves the corrosion resistance.

[0080] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein.

Claims

1. A fixing agent for anodized aluminum alloy films, characterized in that, 150 parts by weight of the color fixing agent for an anodized film of an aluminum alloy comprises the following components in parts by weight: 10-20 parts by weight of an organic acid, 1-3 parts by weight of a surfactant, 0.1-1 part by weight of a corrosion inhibitor, 0.1-1 part by weight of an accelerator, 1-5 parts by weight of a pH adjuster, 2-10 parts by weight of a color fixing aid, 20-40 parts by weight of acetone; the balance being deionized water; and None of the compounds in the organic acid, surfactant, corrosion inhibitor, accelerator, and pH adjuster contains a phosphoric acid group or a phosphate ester group. The color fixing aid is selected from the combination of the following (1) and (2): (1) at least one of acetylacetone zirconium, acetylacetone copper, acetylacetone iron, acetylacetone nickel, acetylacetone cobalt, acetylacetone manganese, acetylacetone chromium, acetylacetone zinc, and acetylacetone calcium; (2) at least one of polyaluminum chloride, polyaluminum ferric chloride, polyaluminum ferric sulfate chloride, and polyaluminum silicate chloride; In the color fixing aid, the mass ratio of component (2) to component (1) is 7:

1.

2. The color fixing agent for an anodized film of an aluminum alloy according to claim 1, characterized by 150 parts by weight of the color fixing agent for an anodized film of an aluminum alloy comprises the following components in parts by weight: 10-15 parts by weight of an organic acid, 1.5-2.5 parts by weight of a surfactant, 0.5-1 part by weight of a corrosion inhibitor, 0.5-1 part by weight of an accelerator, 2-3 parts by weight of a pH adjuster, 3-8 parts by weight of a color fixing aid, 35-40 parts by weight of acetone; the balance being deionized water.

3. The color fixing agent for an anodized film of an aluminum alloy according to claim 1 or 2, characterized by The organic acid is selected from at least one of citric acid, tartaric acid, malic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, itaconic acid, maleic acid, fumaric acid, glycolic acid, glyceric acid, and levulinic acid.

4. The color fixing agent for an anodized film of an aluminum alloy according to claim 1 or 2, characterized by The surfactant is selected from at least one of a fatty alcohol polyoxyethylene ether compound, a Tween compound, a fatty acid polyoxyethylene ester compound, an alkyl glycoside compound, sodium dodecylbenzenesulfonate, an alcohol ether carboxylate compound, sodium diisooctyl sulfosuccinate, cocamidopropyl betaine, and an alkyl dimethyl amine oxide.

5. The color fixing agent for an anodized film of an aluminum alloy according to claim 1 or 2, characterized by The corrosion inhibitor is selected from at least one of benzotriazole and its derivatives, a nitrogen-containing heterocyclic carboxylate, an amide-carboxylic acid compound, and an alkyne alcohol compound.

6. The color fixing agent for an anodized film of an aluminum alloy according to claim 1 or 2, characterized by The accelerator is selected from at least one of ammonium formate, ammonium acetate, ammonium lactate, ammonium citrate, monoethanolamine, diethanolamine, triethanolamine, N-methyldiethanolamine, 2-amino-2-methyl-1-propanol, acetamide, N-methylacetamide, and sorbitol.

7. The color fixing agent for an anodized film of an aluminum alloy according to claim 1 or 2, characterized by The pH adjuster is selected from ammonium bicarbonate, sodium bicarbonate, or aqueous ammonia.

8. A method for producing the color fixing agent for anodized aluminum alloy films according to claim 1, characterized by, The method comprises: dissolving component (1) in the color fixing aid in acetone; dissolving component (2) in the color fixing aid, the organic acid, the surfactant, the corrosion inhibitor, the accelerator, and the pH adjuster in water; and then mixing the aqueous solution and the acetone solution to obtain the color fixing agent for an anodized film of an aluminum alloy.

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