Composite additive for aluminum material anodic oxidation technology and preparation method of composite additive

Abstract

The invention discloses a composite additive for an aluminum material anodic oxidation technology in the technical field of aluminum material anodic oxidation. The composite additive comprises the following components in parts by weight: 28-30 parts of an inorganic additive and 34-36 parts of an organic additive. According to the method, the hardness, the thickness and the corrosion resistance of the oxidation film are improved by preparing the modified sulfonate as the organic additive and selecting the inorganic additive for compounding.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum anodizing, and specifically relates to a composite additive used in aluminum anodizing technology and a preparation method thereof. Background Art

[0002] Aluminum and its alloys are widely used in many fields such as construction, decoration, aviation and daily life due to their low density, high specific strength, easy forming and excellent surface decoration performance. However, their application range and service life are easily affected by their shortcomings such as low surface hardness, poor wear resistance and easy corrosion. Anodizing technology is widely used as a mature and key electrochemical surface treatment process. This technology places aluminum as the anode in a specific electrolyte. Under the action of an external electric field, a controllable oxidation reaction occurs on the aluminum surface, and a dense, high-hardness, unique double-layer structure of aluminum oxide ceramic layer is grown in situ. The inner layer is a dense barrier layer and the outer layer is a dense barrier layer. It is a regular porous layer, and this structure gives it excellent comprehensive performance; the excellent corrosion resistance of the alumina ceramic layer can effectively isolate environmental erosion, the high hardness and wear resistance significantly improve the surface durability, and the good insulation is suitable for electronic components. The rich porous structure is easy to adsorb dyes or perform electrolytic coloring to achieve diverse and stable decorative effects. At the same time, the porous surface also provides an excellent adhesion foundation for subsequent spraying, electrophoresis or bonding. Therefore, anodizing technology has become a core means to improve the functionality and decorativeness of aluminum surfaces, and is widely used in building profiles, automotive parts, consumer electronics housings, mechanical parts and daily products.

[0003] In the aluminum anodizing process, additives play a vital role in optimizing electrolyte performance, improving oxide film quality and expanding its functionality. Although the basic electrolyte can achieve basic oxidation film formation, it often has limitations in film uniformity, film formation rate, hardness, porosity control, coloring ability and operational stability. Therefore, specific additives need to be introduced into the electrolyte for regulation.

[0004] The existing technology currently has the following main problems: although the basic electrolyte can achieve basic oxidation film formation, the hardness, thickness and corrosion resistance of the obtained oxide film are poor. Summary of the Invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a composite additive for aluminum anodizing technology and a preparation method thereof. In order to solve the problems of poor hardness, thickness and corrosion resistance of the oxide film, the present invention proposes to prepare modified sulfonates as organic additives and select inorganic additives for compounding, thereby achieving the improvement of the hardness, thickness and corrosion resistance of the oxide film.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: The present invention proposes a composite additive for aluminum anodizing technology, which comprises the following components in parts by weight: 28-30 parts of inorganic additives and 34-36 parts of organic additives.

[0007] Preferably, the inorganic additive is one of cerium sulfate, lanthanum sulfate and nickel sulfate;

[0008] Furthermore, the inorganic additive is cerium sulfate.

[0009] Preferably, the organic additive is one of modified sulfonate, glycerol, citric acid, and sodium dodecylbenzenesulfonate;

[0010] Furthermore, the organic additive is a modified sulfonate.

[0011] Preferably, the modified sulfonate is made from the following parts by weight: 18-20 parts of 5,6-diketo-1,10-phenanthroline, 6-8 parts of acrolein, 30-36 parts of ammonium acetate, 8-12 parts of benzene isocyanate, 9-13 parts of ethylene glycol acrylate, and 26-28 parts of sodium C16-internal olefin sulfonate.

[0012] Preferably, the preparation method of the modified sulfonate specifically comprises the following steps:

[0013] S1. Add 5,6-diketo-1,10-phenanthroline in an amount of 0.06-0.08 g / mL to acetic acid, add acrolein and ammonium acetate under nitrogen protection, heat and stir until completely dissolved, to obtain a mixed solution;

[0014] S2, heating the mixed solution obtained in S1 with stirring for reaction, cooling and pouring into ice water, adjusting the pH to 7, filtering and obtaining flocculent matter as the double bond coordination modifier;

[0015] S3, adding ethylene glycol acrylate to benzene isocyanate, mixing evenly, then adding 1 wt% of 1,4-vinylpiperazine to ethylene glycol acrylate, passing nitrogen to remove air, and heating in a water bath to react to obtain an isocyanate derivative;

[0016] S4, adding the isocyanate derivative obtained in S3 to 98 wt % concentrated sulfuric acid in an amount of 0.12-0.18 g / mL, heating in a water bath to dissolve, to obtain a mixed solution, then dropwise adding 0.3 times the volume of the mixed solution of 50 wt % fuming sulfuric acid, keeping the temperature to react for 4 h to obtain a reaction solution, adding the reaction solution to 0-3° C. deionized water, filtering, washing, and drying to obtain a double bond sulfonic acid modifier;

[0017] S5. Dissolve sodium C16-internal olefin sulfonate in deionized water, introduce nitrogen to expel air, add the double bond coordination modifier obtained in S2, stir and dissolve in a 50°C water bath to obtain a mixed solution, add dibenzoyl peroxide, and then add the double bond sulfonic acid modifier obtained in S4, keep the mixture warm for 60-80 minutes, evaporate, wash, and dry to obtain a modified sulfonate.

[0018] Preferably, in S1, heating and stirring are performed at a temperature of 60°C-70°C and a speed of 200-250 rpm.

[0019] Preferably, in S2, the reaction is heated and stirred at a temperature of 115-125°C, a speed of 60-100 rpm, and a time of 3-5 hours.

[0020] Preferably, in S3, the reaction is heated in a water bath at a temperature of 50-55° C. for 2-3 h.

[0021] Preferably, in S4, the solution is dissolved by heating in a water bath at a temperature of 40-50°C.

[0022] Preferably, in S5, the amount of sodium C16-internal olefin sulfonate added to deionized water is 10-16 mg / mL.

[0023] Preferably, in S5, the amount of dibenzoyl peroxide added to the mixed solution is 0.9-1.2 mg / mL.

[0024] The present invention also provides a method for preparing a composite additive for aluminum anodizing technology, which specifically comprises the following steps: adding an inorganic additive to an organic additive, uniformly mixing, and obtaining the composite additive for aluminum anodizing technology.

[0025] The beneficial effects achieved by the present invention are as follows:

[0026] The present invention proposes that 5,6-diketo-1,10-phenanthroline is used as a complexing agent and modified with acrolein and ammonium acetate to obtain a double bond coordination modifier having a dinitrogen structure capable of complexing metal ions and a carbon-carbon double bond capable of undergoing an addition reaction, isocyanate benzene is used to provide a benzene ring and ethylene glycol acrylate is used to provide a double bond, the benzene ring is combined with an isocyanate group and a hydroxyl group, and the benzene ring is sulfonated with concentrated sulfuric acid and fuming sulfuric acid to obtain a double bond sulfonic acid modifier having a sulfonic acid group and a carbon-carbon double bond capable of undergoing an addition reaction, and finally sodium C16-internal olefin sulfonate is used as a matrix to react with the double bond coordination modifier and the double bond sulfonic acid modifier in sequence to obtain a modified sulfonate having multiple sulfonates. Acid groups and coordination structures; among them, the organic matter of the ligand forms a complex due to the complexation effect, and a complex-dissociation equilibrium occurs on the anode surface or in the micropores of the membrane, which plays a role in transporting from the anode interface, thereby reducing the dissolution rate of the oxide film. At the same time, due to the high valence and positive standard redox potential of rare earth ions, they play a role similar to that of a catalyst in the intermediate reaction during the anodic oxidation process, thereby accelerating the film formation speed and changing the membrane structure, which is beneficial to the improvement of the performance of the anodic oxide film. The complex formed by the complex affects the oxidation process, causing the parameters such as the barrier layer thickness, pore size, porosity of the oxide film to change, thereby affecting the corrosion resistance of the oxide film. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Result diagram of impedance test of Examples 1-3 and Comparative Examples 1-3 of the present invention;

[0028] Figure 2 The results of wear resistance tests of Examples 1-3 and Comparative Examples 1-3 of the present invention are shown in FIG.

[0029] Figure 3 Graph showing the corrosion test results of Examples 1-3 of the present invention and Comparative Examples 1-3.

[0030] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all 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.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those familiar to those skilled in the art. Furthermore, any methods and materials similar or equivalent to those described herein can be applied to the present invention. The preferred embodiments and materials described herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0033] The experimental methods in the following examples are conventional methods unless otherwise specified; the experimental materials used in the following examples are purchased from commercial channels unless otherwise specified.

[0034] Example 1

[0035] A composite additive for aluminum anodizing technology comprises the following components in parts by weight: 28 parts of cerium sulfate and 34 parts of modified sulfonate.

[0036] The modified sulfonate is prepared from the following parts by weight: 18 parts of 5,6-diketo-1,10-phenanthroline, 6 parts of acrolein, 30 parts of ammonium acetate, 8 parts of benzene isocyanate, 9 parts of ethylene glycol acrylate, and 26 parts of sodium C16-internal olefin sulfonate.

[0037] The preparation method of the modified sulfonate specifically comprises the following steps:

[0038] S1. Add 5,6-diketo-1,10-phenanthroline at an addition amount of 0.06 g / mL to acetic acid, add acrolein and ammonium acetate under nitrogen protection, heat at 60°C and stir at 200 rpm until completely dissolved to obtain a mixed solution;

[0039] S2, heating the mixture obtained in S1 at 115°C and stirring at 60 rpm for 3 hours, cooling and pouring into ice water, adjusting the pH to 7, and filtering to obtain flocculent matter as a double bond coordination modifier;

[0040] S3. Add ethylene glycol acrylate to benzene isocyanate and mix well. Then add 1 wt % of 1,4-vinylpiperazine to ethylene glycol acrylate, introduce nitrogen to remove air, and heat in a water bath at 50° C. for 2 h to obtain an isocyanate derivative.

[0041] S4, adding the isocyanate derivative obtained in S3 to 98 wt % concentrated sulfuric acid in an amount of 0.12 g / mL, heating in a water bath at 40° C. to dissolve, to obtain a mixed solution, then dropwise adding 0.3 times the volume of the mixed solution of 50 wt % fuming sulfuric acid, keeping the temperature for reaction for 4 h to obtain a reaction solution, adding the reaction solution to 0° C. deionized water, filtering, washing, and drying to obtain a double-bond sulfonic acid modifier;

[0042] S5. Dissolve C16-internal olefin sodium sulfonate in deionized water at an addition amount of 10 mg / mL, introduce nitrogen to expel the air, add the double bond coordination modifier obtained in S2, stir and dissolve in a 50°C water bath to obtain a mixed solution, add dibenzoyl peroxide at an addition amount of 0.9 mg / mL, and then add the double bond sulfonic acid modifier obtained in S4, keep the reaction warm for 60 minutes, evaporate, wash, and dry to obtain a modified sulfonate.

[0043] The present invention also provides a method for preparing a composite additive for aluminum anodizing technology, which specifically comprises the following steps: adding an inorganic additive to an organic additive, uniformly mixing, and obtaining the composite additive for aluminum anodizing technology.

[0044] Example 2

[0045] A composite additive for aluminum anodizing technology comprises the following components in parts by weight: 30 parts of cerium sulfate and 36 parts of modified sulfonate.

[0046] The modified sulfonate is prepared from the following parts by weight: 20 parts of 5,6-diketo-1,10-phenanthroline, 8 parts of acrolein, 36 parts of ammonium acetate, 12 parts of benzene isocyanate, 13 parts of ethylene glycol acrylate, and 28 parts of sodium C16-internal olefin sulfonate.

[0047] The preparation method of the modified sulfonate specifically comprises the following steps:

[0048] S1. Add 5,6-diketo-1,10-phenanthroline at an addition amount of 0.08 g / mL to acetic acid, add acrolein and ammonium acetate under nitrogen protection, heat at 70°C and stir at 250 rpm until completely dissolved to obtain a mixed solution;

[0049] S2, heating the mixture obtained in S1 at 125°C and stirring at 100 rpm for 5 h, cooling and pouring into ice water, adjusting the pH to 7, and filtering to obtain flocculent matter as a double bond coordination modifier;

[0050] S3. Add ethylene glycol acrylate to benzene isocyanate and mix well. Then add 1 wt % of 1,4-vinylpiperazine to ethylene glycol acrylate. Pour nitrogen into the mixture to remove air. Heat the mixture in a water bath at 55° C. for 3 h to obtain an isocyanate derivative.

[0051] S4, adding the isocyanate derivative obtained in S3 to 98 wt % concentrated sulfuric acid at an addition amount of 0.18 g / mL, heating in a water bath at 50° C. to dissolve, to obtain a mixed solution, then dropwise adding 0.3 times the volume of the mixed solution of 50 wt % fuming sulfuric acid, keeping the temperature for reaction for 4 h to obtain a reaction solution, adding the reaction solution to 3° C. deionized water, filtering, washing, and drying to obtain a double-bond sulfonic acid modifier;

[0052] S5. Dissolve C16-internal olefin sodium sulfonate in deionized water at an addition amount of 16 mg / mL, introduce nitrogen to expel the air, add the double bond coordination modifier obtained in S2, stir and dissolve in a 50°C water bath to obtain a mixed solution, add dibenzoyl peroxide at an addition amount of 1.2 mg / mL, and then add the double bond sulfonic acid modifier obtained in S4, keep the reaction warm for 80 minutes, evaporate, wash, and dry to obtain a modified sulfonate.

[0053] The present invention also provides a method for preparing a composite additive for aluminum anodizing technology, which specifically comprises the following steps: adding an inorganic additive to an organic additive, uniformly mixing, and obtaining the composite additive for aluminum anodizing technology.

[0054] Example 3

[0055] A composite additive for aluminum anodizing technology comprises the following components in parts by weight: 29 parts of cerium sulfate and 35 parts of modified sulfonate.

[0056] The modified sulfonate is prepared from the following components in parts by weight: 19 parts of 5,6-diketo-1,10-phenanthroline, 7 parts of acrolein, 34 parts of ammonium acetate, 10 parts of benzene isocyanate, 12 parts of ethylene glycol acrylate, and 27 parts of sodium C16-internal olefin sulfonate.

[0057] The preparation method of the modified sulfonate specifically comprises the following steps:

[0058] S1. Add 5,6-diketo-1,10-phenanthroline at an addition amount of 0.07 g / mL to acetic acid, add acrolein and ammonium acetate under nitrogen protection, heat at 65° C. and stir at 225 rpm until completely dissolved to obtain a mixed solution;

[0059] S2, heating the mixture obtained in S1 at 120°C and stirring at 80 rpm for 4 hours, cooling and pouring into ice water, adjusting the pH to 7, and filtering to obtain flocculent matter as a double bond coordination modifier;

[0060] S3. Add ethylene glycol acrylate to benzene isocyanate and mix well. Then add 1 wt % of 1,4-vinylpiperazine to ethylene glycol acrylate. Pour nitrogen into the mixture to remove air. Heat the mixture in a water bath at 52.5° C. for 2.5 h to obtain an isocyanate derivative.

[0061] S4, adding the isocyanate derivative obtained in S3 in an amount of 0.16 g / mL to 98 wt % concentrated sulfuric acid, heating in a 45° C. water bath to dissolve, to obtain a mixed solution, then dropwise adding 0.3 times the volume of the mixed solution of 50 wt % fuming sulfuric acid, keeping the temperature to react for 4 h to obtain a reaction solution, adding the reaction solution to 2° C. deionized water, filtering, washing, and drying to obtain a double-bond sulfonic acid modifier;

[0062] S5. Dissolve C16-internal olefin sodium sulfonate in deionized water at an addition amount of 13 mg / mL, introduce nitrogen to expel the air, add the double bond coordination modifier obtained in S2, stir and dissolve in a 50°C water bath to obtain a mixed solution, add dibenzoyl peroxide at an addition amount of 1.1 mg / mL, and then add the double bond sulfonic acid modifier obtained in S4, keep the reaction warm for 70 minutes, evaporate, wash, and dry to obtain a modified sulfonate.

[0063] The present invention also provides a method for preparing a composite additive for aluminum anodizing technology, which specifically comprises the following steps:

[0064] The inorganic additive is added to the organic additive and mixed evenly to obtain a composite additive for aluminum anodizing technology.

[0065] Comparative Example 1

[0066] This comparative example provides an additive, which differs from Example 1 only in that nickel sulfate replaces cerium sulfate in all components, and the remaining components and component contents are the same as those in Example 1.

[0067] Comparative Example 2

[0068] This comparative example provides an additive, which differs from Example 1 only in that all components do not contain a double bond coordination modifier, and the remaining components and component contents are the same as those in Example 1.

[0069] Comparative Example 3

[0070] This comparative example provides an additive, which differs from Example 1 only in that all components do not contain a double-bond sulfonic acid modifier, and the remaining components and component contents are the same as those in Example 1.

[0071] Experimental example

[0072] 1. Impedance test

[0073] The additives obtained in Examples 1-3 and Comparative Examples 1-3 were used to oxidize the aluminum anode in a sulfuric acid-oxalic acid oxidation system, and then dried. Electrochemical impedance spectroscopy was performed in a 3.5 wt % sodium chloride solution to record the resistance.

[0074] Figure 1 This is a graph showing the impedance test results of Examples 1-3 and Comparative Examples 1-3 of the present invention; as shown in the figure, the resistances of Examples 1-3 and Comparative Examples 1-3 are 106.2KΩ, 103.6KΩ, 106.5KΩ, 86.5KΩ, 74.9KΩ, and 78.6KΩ, respectively. The resistance value of Example 1-3 is significantly greater than that of Comparative Example 1-3, indicating that the corrosion resistance of Example 1-3 is stronger than that of Comparative Example 1-3. The use of nickel sulfate and the preparation of double bond coordination modifiers and double bond sulfonic acid modifiers effectively improve the corrosion resistance of the material.

[0075] 2. Wear resistance test

[0076] The additives obtained in Examples 1-3 and Comparative Examples 1-3 were used to oxidize the aluminum anode in a sulfuric acid-oxalic acid oxidation system, and then dried. Quartz sand with a diameter of 0.5-1 mm was dropped from a height of 50 cm, and the sample was impacted at an angle of 45°. Samples were taken every 5 seconds until the sample impedance dropped sharply, and the impact time for each group was recorded.

[0077] Figure 2 This is a graph showing the wear resistance test results of Examples 1-3 and Comparative Examples 1-3 of the present invention; as shown in the figure, the impact times of Examples 1-3 and Comparative Examples 1-3 are 66s, 69s, 68s, 45s, 43s, and 49s, respectively. The impact time of Example 1-3 is significantly greater than that of Comparative Example 1-3, indicating that the wear resistance of Example 1-3 is stronger than that of Comparative Example 1-3. The use of nickel sulfate and the preparation of double bond coordination modifiers and double bond sulfonic acid modifiers effectively improve the wear resistance of the material.

[0078] 3. Corrosion test

[0079] The additives obtained in Examples 1-3 and Comparative Examples 1-3 were used to oxidize the aluminum sheet anode in a sulfuric acid-oxalic acid oxidation system. After completion, the aluminum sheet was dried. A cutter was used to scratch through the coating until the steel sheet was exposed and the edges were sealed with wax. The scratch was greater than 20 mm from any edge of the steel sheet. The aluminum sheet was placed in a 35°C salt spray chamber and the corrosion conditions were recorded. When rust spots appeared on the plate surface or the rust spread at the scratch line exceeded 2 cm, it was recorded as the salt spray resistance time.

[0080] Figure 3 This is a graph showing the corrosion test results of Examples 1-3 and Comparative Examples 1-3 of the present invention; as shown in the figure, the corrosion resistance times of Examples 1-3 and Comparative Examples 1-3 are 225.1h, 226.2h, 224.5h, 186.1h, 179.9h, and 172.6h, respectively. The corrosion resistance time of Example 1-3 is significantly greater than that of Comparative Example 1-3, indicating that the corrosion resistance of Example 1-3 is stronger than that of Comparative Example 1-3. The use of nickel sulfate and the preparation of double bond coordination modifiers and double bond sulfonic acid modifiers effectively improve the corrosion resistance of the material.

[0081] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

[0082] The present invention and its embodiments are described above. Such description is not restrictive. The drawings show only one embodiment of the present invention, and actual applications are not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, any method and embodiment similar to the technical solution without creative design shall fall within the scope of protection of the present invention.

Claims

1. A composite additive for aluminum anodizing technology, characterized by: The invention comprises the following components in parts by weight: 28-30 parts of an inorganic additive and 34-36 parts of an organic additive; the inorganic additive is one of cerium sulfate, lanthanum sulfate, and nickel sulfate; the organic additive is one of modified sulfonate, glycerol, citric acid, and sodium dodecylbenzenesulfonate; A preparation method of a composite additive for aluminum anodizing technology specifically comprises the following steps: adding an inorganic additive to an organic additive, uniformly mixing, and obtaining the composite additive for aluminum anodizing technology.

2. The composite additive for aluminum anodizing technology according to claim 1, characterized in that: The inorganic additive is cerium sulfate; the organic additive is a modified sulfonate; the modified sulfonate is prepared from the following parts by weight: 18-20 parts of 5,6-diketo-1,10-phenanthroline, 6-8 parts of acrolein, 30-36 parts of ammonium acetate, 8-12 parts of benzene isocyanate, 9-13 parts of ethylene glycol acrylate, and 26-28 parts of sodium C16-internal olefin sulfonate.

3. The composite additive for aluminum anodizing technology according to claim 2, characterized in that: The preparation method of the modified sulfonate specifically comprises the following steps: S1. Add 5,6-diketo-1,10-phenanthroline in an amount of 0.06-0.08 g / mL to acetic acid, add acrolein and ammonium acetate under nitrogen protection, heat and stir until completely dissolved, to obtain a mixed solution; S2, heating the mixed solution obtained in S1 with stirring for reaction, cooling and pouring into ice water, adjusting the pH to 7, filtering and obtaining flocculent matter as the double bond coordination modifier; S3, adding ethylene glycol acrylate to benzene isocyanate, mixing evenly, then adding 1 wt% of 1,4-vinylpiperazine to ethylene glycol acrylate, passing nitrogen to remove air, and heating in a water bath to react to obtain an isocyanate derivative; S4, adding the isocyanate derivative obtained in S3 to 98 wt % concentrated sulfuric acid in an amount of 0.12-0.18 g / mL, heating in a water bath to dissolve, to obtain a mixed solution, then dropwise adding 0.3 times the volume of the mixed solution of 50 wt % fuming sulfuric acid, keeping the temperature to react for 4 h to obtain a reaction solution, adding the reaction solution to 0-3° C. deionized water, filtering, washing, and drying to obtain a double-bond benzenesulfonic acid modifier; S5. Dissolve sodium C16-internal olefin sulfonate in deionized water, introduce nitrogen to expel air, add the double bond coordination modifier obtained in S2, stir and dissolve in a 50°C water bath to obtain a mixed solution, add dibenzoyl peroxide, and then add the double bond sulfonic acid modifier obtained in S4, keep the mixture warm for 60-80 minutes, evaporate, wash, and dry to obtain a modified sulfonate.

4. The composite additive for aluminum anodizing technology according to claim 3, characterized in that: In S1, heating and stirring are performed at a temperature of 60°C-70°C and a speed of 200-250 rpm.

5. The composite additive for aluminum anodizing technology according to claim 4, characterized in that: In S2, the reaction is heated and stirred at a temperature of 115-125°C, a speed of 60-100 rpm, and a time of 3-5 hours.

6. The composite additive for aluminum anodizing technology according to claim 5, characterized in that: In S3, the reaction is heated in a water bath at 50-55°C for 2-3 h.

7. The composite additive for aluminum anodizing technology according to claim 6, characterized in that: In S4, the mixture is dissolved by heating in a water bath at a temperature of 40-50°C.

8. The composite additive for aluminum anodizing technology according to claim 7, characterized in that: In S5, the amount of the sodium C16-internal olefin sulfonate added to deionized water is 10-16 mg / mL.

9. The composite additive for aluminum anodizing technology according to claim 8, characterized in that: In S5, the amount of dibenzoyl peroxide added to the mixture is 0.9-1.2 mg / mL.

Images