High-temperature-resistant anode hard aluminum oxidation production method

Abstract

The invention provides a high-temperature-resistant anode hard aluminum oxidation production method. The high-temperature-resistant anode hard aluminum oxidation production method comprises the following steps that S1, an aluminum product is pretreated; s2, cleaning the aluminum product; s3, degreasing and oil removal treatment of the aluminum product; s4, alkali etching treatment of the aluminum product; s5, neutralizing the aluminum product; s6, carrying out bright dipping treatment on the aluminum product; s7, the aluminum product is subjected to anodic oxidation treatment; s8, the oxidation film is subjected to chambering treatment; s9, performing vacuum heat treatment on the oxide layer; s10, performing electrolytic coloring treatment on the oxide layer; s11, performing electrophoresis treatment on the anodic aluminum oxide product; s12, hole sealing treatment is conducted on the anodic aluminum oxide product; s13, the anodic aluminum oxide product is subjected to water washing treatment; and S14, drying the anodized aluminum oxide product. According to the method, the aluminum alloy hard anodized oxide film can be subjected to chambering treatment through sulfonated anthracene, the fluoropolymer is introduced, and then the fluoropolymer and the aluminum alloy hard anodized oxide film can be fused into a whole through vacuum heat treatment; the obtained synergistic coating can further improve the wear resistance, corrosion resistance, moisture resistance and high temperature resistance of the oxide layer.

Description

Technical Field

[0001] The invention belongs to the technical field of anode hard aluminum oxidation, in particular to a production method of high-temperature resistant anode hard aluminum oxidation. Background Art

[0002] Aluminum is a silvery-white metal with the advantages of light weight, ductility, good electrical conductivity, thermal conductivity, heat resistance and radiation resistance. It is a very common raw material in daily life. Aluminum will form a dense oxide film on its surface in the air, which makes aluminum have good corrosion resistance. The full name of hard anodizing for aluminum products we usually see is hard anodizing. The main purpose of hard anodizing of aluminum alloys is to improve the various properties of aluminum and aluminum alloys, including corrosion resistance, wear resistance, weather resistance, insulation and adsorption. It is suitable for deformed aluminum alloys and may also be used for die-cast aluminum alloy parts;

[0003] The existing anodized hard aluminum production method is mainly carried out through degreasing, alkaline etching, polishing, anodizing, electrolytic coloring, electrophoresis, sealing and drying. The performance of the products produced by this oxidation method has certain limitations, especially in terms of heat resistance, which results in that the aluminum products after electrolytic oxidation cannot meet the technical requirements of high-demand equipment.

[0004] In summary, the present invention provides a method for producing high temperature resistant anodic hard aluminum oxidation to solve the above problems. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a high temperature resistant anodic hard aluminum oxidation production method to solve the problems in the prior art.

[0006] A method for producing high temperature resistant anode hard aluminum oxide comprises the following steps:

[0007] S1: Pretreatment of aluminum products: first, grind the burrs on the surface of aluminum products, and remove the oxide scale on the surface of aluminum alloy by sandblasting;

[0008] S2: Cleaning of aluminum products: Use a brush to clean the dust and particles attached to the surface of the aluminum products, and then rinse the aluminum product surface treated by the brush with flowing water;

[0009] S3: Degreasing and oil removal of aluminum products. Hang the aluminum workpiece on the titanium hanger, then put the aluminum workpiece into the degreasing tank for degreasing. At the same time, ultrasonic degreasing can be assisted;

[0010] S4: Alkaline etching treatment of aluminum products. The surface of the aluminum product workpiece is cleaned by sodium hydroxide solution. This operation can be used as a supplementary treatment after the aluminum product workpiece is degreased, and the oil and dirt attached to the surface can be further cleaned;

[0011] S5: Aluminum product neutralization treatment, using acidic solution to treat the gray or black ash attached to the surface of aluminum products after alkaline etching, and at the same time neutralize the alkali solution remaining on the surface of aluminum products, and then rinse the surface of aluminum products with water;

[0012] S6: Polishing treatment of aluminum products: immerse the treated aluminum product workpiece in a solution of polishing agent and perform polishing operation in a set processing environment. After the polishing operation is completed, rinse the surface of the aluminum product workpiece with pure water and dry it;

[0013] S7: Anodizing of aluminum products: The processed aluminum product workpiece is used as the anode, and then the aluminum product workpiece is immersed in the electrolyte. When the power is turned on, an oxide layer can be formed on the surface of the workpiece. After rinsing with pure water, an aluminum product workpiece with an oxide film can be obtained;

[0014] S8: The oxide film is subjected to pore expansion treatment, and the anodized oxide film of the aluminum product is subjected to pore expansion treatment and fluoropolymer is introduced;

[0015] S9: Vacuum heat treatment of the oxide layer. Through vacuum heat treatment, the fluoropolymer and the aluminum alloy hard anodized film are fused into one to form a synergistic coating. The aluminum workpiece with the synergistic coating needs to be rinsed with pure water;

[0016] S10: electrolytic coloring of the oxide layer, immersing the aluminum workpiece in an electrolyte, adding different color matching chemical raw materials to the electrolyte, and directly obtaining a colored oxide film on the surface of the aluminum workpiece through a chemical reaction of the added chemical raw materials after power is turned on, thereby completing the electrolytic coloring of the aluminum workpiece;

[0017] S11: Electrophoresis treatment of anodized aluminum products. The colored aluminum product workpiece is first thoroughly rinsed with hot water, then the surface of the aluminum product workpiece is rinsed with pure water, and then the aluminum product workpiece is placed in an electrophoresis tank for electrophoresis operation;

[0018] S12: Sealing treatment of anodized aluminum products, immersing the aluminum product workpiece after electrophoresis treatment into neutral hot water for sealing operation;

[0019] S13: Anodized aluminum product water washing treatment. After the sealing is completed, the aluminum product workpiece can be rinsed with pure water, so that the neutral solution on the surface of the aluminum product workpiece can be rinsed clean;

[0020] S14: Drying treatment of anodized aluminum products: hanging the clean aluminum workpieces and drying the aluminum workpieces through a drying device.

[0021] Preferably, the solution used for degreasing in S3 is a diluted aqueous sulfuric acid solution with a concentration of 60-120 g / l, the set temperature is 20-30°, the degreasing time is set to 5-10 minutes, and the degreasing in S3 can be performed using organic solvent degreasing, surfactant degreasing, alkaline solution degreasing, acid solution degreasing, electrolytic degreasing and emulsification degreasing.

[0022] Preferably, the alkaline etching bath in S4 is a liquid alkali prepared by mixing sodium hydroxide and water at a concentration of 20 to 80 g / l, the working temperature is set at 40 to 60°C, and the working time is 0.5 to 5 min. The role of alkaline etching is to further clean the oil and dirt attached to the surface, remove the natural oxide film and slight scratches on the surface of the product, so that the product exposes a pure metal matrix, which is beneficial to the formation of the anodic film and obtains a higher quality film layer.

[0023] Preferably, the S6 neutralization solution uses a sulfuric acid aqueous solution with a concentration of 80-140 g / l, and 0.5 kg of a brightening agent with oxalic acid as the main raw material is added according to 1000 m2 of aluminum hangers. The working temperature is set at 20-30° and the working time is 3-5 min.

[0024] Preferably, the electrolyte in S7 uses a sulfuric acid aqueous solution with a concentration of 180-220 g / l, and 1 kg of oxidant is added according to 100 m2 of aluminum hangers, the working temperature is set to 20-30°C, the electrolysis current density is set to 1.2-1.5 A / dm2, and sulfonated anthracene is mixed in the electrolyte.

[0025] Preferably, introducing lubricants or sealants into the oxide film micropores and their surfaces in the S8 and / or the hard oxide film micropores and their surfaces after pore expansion treatment is also one of the key steps in preparing the synergistic coating. The more and deeper the fluoropolymer particles enter the micropores, the better the overall performance of the synergistic coating will be. Various methods can be used to introduce lubricants such as fluoropolymers into the surface base layer of the prepared aluminum alloy.

[0026] Preferably, the electrolytic coloring solution in S10 is added with an appropriate amount of NS-201 electrolytic coloring stabilizer, so that the coloring speed is higher than the coloring speed of the solution without adding stabilizer. This can reduce the Ni2+ concentration accordingly, thereby reducing the cost of the solution, while also improving the dispersibility of the solution and improving the uniformity of coloring. During electrolytic coloring, as the temperature increases, the ion diffusion rate accelerates and the color tone deepens. In order to make the coloring uniform, a tank liquid circulation stirring method is adopted to stir under the liquid surface.

[0027] Preferably, the hot water washing in S11 is set at a temperature of 65-75 degrees, and the rinsing time is set to 4-5 minutes. The hot water rinsing is mainly to expand the anodized film on the surface of the aluminum product workpiece, thereby preventing impurity ions on the surface of the anodized film from contaminating the electrophoresis tank.

[0028] Preferably, the temperature of the hot water in S12 is maintained above 85 degrees. In such a solution environment, alumina can be hydrated to form alumina monohydrate. The density of alumina monohydrate is smaller than that of alumina, and the volume increases by about 33%, thereby blocking the pores of the oxide film.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] First, the surface of the aluminum product is polished by a polishing device, and the surface oxide scale is removed by sandblasting. Then the surface of the aluminum product can be cleaned, and then the aluminum product workpiece is hung on a titanium hanger for degreasing, and the aluminum product workpiece is degreased with the assistance of ultrasound. The surface of the aluminum product workpiece is cleaned with a sodium hydroxide solution to further clean the oil and dirt attached to the surface. Then, the gray or black ash attached to the surface of the aluminum product workpiece after alkaline etching is treated with an acidic solution, which can play a neutralizing role, thereby preventing the residual alkali solution on the surface of the workpiece from affecting the electrolytic oxidation effect of the aluminum product. The result is as follows: the treated aluminum workpiece is immersed in a solution containing a brightening agent, the processed aluminum workpiece is immersed in an electrolyte as an anode, and an oxide layer can be formed on the surface of the workpiece by turning on the power supply, and an aluminum alloy hard anodized film is prepared by electrolysis using a mixed acid solution containing sulfonated anthracene, and then the aluminum alloy hard anodized film is subjected to pore expansion treatment and a fluoropolymer is introduced, and then the fluoropolymer is fused with the aluminum alloy hard anodized film through vacuum heat treatment to obtain a synergistic coating, and the obtained synergistic coating can further improve the wear resistance, corrosion resistance, moisture resistance and high temperature resistance of the oxide layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flow chart of the technical implementation method of the present invention;

[0032] Figure 2 It is a flow chart of the steps of the technical implementation method of the present invention. DETAILED DESCRIPTION

[0033] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] like Figure 1-2 As shown, the present invention provides a method for producing high temperature resistant anode hard aluminum oxide, comprising the following steps:

[0035] S1: Pretreatment of aluminum products: first, grind the burrs on the surface of aluminum products, and remove the oxide scale on the surface of aluminum alloy by sandblasting;

[0036] S2: Cleaning of aluminum products: Use a brush to clean the dust and particles attached to the surface of the aluminum products, and then rinse the aluminum product surface treated by the brush with flowing water;

[0037] S3: Degreasing and oil removal of aluminum products. Hang the aluminum workpiece on the titanium hanger, then put the aluminum workpiece into the degreasing tank for degreasing. At the same time, ultrasonic degreasing can be assisted;

[0038] S4: Alkaline etching treatment of aluminum products. The surface of the aluminum product workpiece is cleaned by sodium hydroxide solution. This operation can be used as a supplementary treatment after the aluminum product workpiece is degreased, and the oil and dirt attached to the surface can be further cleaned;

[0039] S5: Aluminum product neutralization treatment, using acidic solution to treat the gray or black ash attached to the surface of aluminum products after alkaline etching, and at the same time neutralize the alkali solution remaining on the surface of aluminum products, and then rinse the surface of aluminum products with water;

[0040] S6: Polishing treatment of aluminum products: immerse the treated aluminum product workpiece in a solution of polishing agent and perform polishing operation in a set processing environment. After the polishing operation is completed, rinse the surface of the aluminum product workpiece with pure water and dry it;

[0041] S7: Anodizing of aluminum products: The processed aluminum product workpiece is used as the anode, and then the aluminum product workpiece is immersed in the electrolyte. When the power is turned on, an oxide layer can be formed on the surface of the workpiece. After rinsing with pure water, an aluminum product workpiece with an oxide film can be obtained;

[0042] S8: The oxide film is subjected to pore expansion treatment, and the anodized oxide film of the aluminum product is subjected to pore expansion treatment and fluoropolymer is introduced;

[0043] S9: Vacuum heat treatment of the oxide layer. Through vacuum heat treatment, the fluoropolymer and the aluminum alloy hard anodized film are fused into one to form a synergistic coating. The aluminum workpiece with the synergistic coating needs to be rinsed with pure water;

[0044] S10: electrolytic coloring of the oxide layer, immersing the aluminum workpiece in an electrolyte, adding different color matching chemical raw materials to the electrolyte, and directly obtaining a colored oxide film on the surface of the aluminum workpiece through a chemical reaction of the added chemical raw materials after power is turned on, thereby completing the electrolytic coloring of the aluminum workpiece;

[0045] S11: Electrophoresis treatment of anodized aluminum products. The colored aluminum product workpiece is first thoroughly rinsed with hot water, then the surface of the aluminum product workpiece is rinsed with pure water, and then the aluminum product workpiece is placed in an electrophoresis tank for electrophoresis operation;

[0046] S12: Sealing treatment of anodized aluminum products, immersing the aluminum product workpiece after electrophoresis treatment into neutral hot water for sealing operation;

[0047] S13: Anodized aluminum product water washing treatment. After the sealing is completed, the aluminum product workpiece can be rinsed with pure water, so that the neutral solution on the surface of the aluminum product workpiece can be rinsed clean;

[0048] S14: Drying treatment of anodized aluminum products: hanging the clean aluminum workpieces and drying the aluminum workpieces through a drying device.

[0049] The solution used for degreasing in S3 is a diluted aqueous sulfuric acid solution with a concentration of 60-120 g / l, the set temperature is 20-30°, the degreasing time is set to 5-10 minutes, and the degreasing in S3 can be performed using organic solvent degreasing, surfactant degreasing, alkaline solution degreasing, acid solution degreasing, electrolytic degreasing and emulsification degreasing.

[0050] The alkaline etching bath solution in S4 is a liquid alkali prepared from sodium hydroxide and water with a concentration of 20-80 g / l. The working temperature is set at 40-60°C and the working time is 0.5-5 min. The role of alkaline etching is to further clean the oil and dirt attached to the surface, remove the natural oxide film and slight scratches on the surface of the product, so that the product exposes a pure metal matrix, which is conducive to the formation of the anodic film and obtains a higher quality film layer.

[0051] The S6 neutralization solution uses a sulfuric acid aqueous solution with a concentration of 80-140g / l. According to 1000m2 of aluminum hangers, 0.5kg of a brightening agent with oxalic acid as the main raw material is added. The working temperature is set at 20-30° and the working time is 3-5min.

[0052] The electrolyte in S7 uses a sulfuric acid aqueous solution with a concentration of 180-220 g / l, and 1 kg of oxidant is added according to 100 m2 of aluminum hangers. The working temperature is set at 20-30°C, the electrolysis current density is set at 1.2-1.5 A / dm2, and sulfonated anthracene is mixed in the electrolyte.

[0053] Introducing lubricants or sealants into the micropores and surfaces of the oxide film in S8 and / or the micropores and surfaces of the hard oxide film that has been expanded is also one of the key steps in preparing the synergistic coating. The more and deeper the fluoropolymer particles enter the micropores, the better the overall performance of the synergistic coating will be. Various methods can be used to introduce lubricants such as fluoropolymers into the base layer on the surface of the prepared aluminum alloy.

[0054] In S10, an appropriate amount of NS-201 electrolytic coloring stabilizer is added to the electrolytic coloring solution, so that the coloring speed is higher than that of the solution without stabilizer. This can reduce the Ni2+ concentration accordingly, thereby reducing the cost of the solution, while also improving the dispersion ability of the solution and the uniformity of coloring. During electrolytic coloring, as the temperature rises, the ion diffusion speed accelerates and the color tone deepens. In order to make the coloring uniform, the tank liquid circulation stirring method is adopted to stir under the liquid surface.

[0055] The hot water washing temperature in S11 is set at 65-75 degrees, and the rinsing time is set to 4-5 minutes. The hot water rinsing is mainly used to expand the anodized film on the surface of the aluminum workpiece, thereby preventing impurity ions on the surface of the anodized film from contaminating the electrophoresis tank.

[0056] The temperature of the hot water in S12 is maintained above 85 degrees. In such a solution environment, alumina can be hydrated to form alumina monohydrate. The density of alumina monohydrate is lower than that of alumina, and its volume increases by about 33%, thereby blocking the pores of the oxide film.

[0057] Specific working principle: Figure 1-2As shown, when using the high-temperature resistant anodic hard aluminum oxidation production method, the burrs on the surface of the aluminum product are first polished, and the oxide skin on the surface of the aluminum alloy is removed by sandblasting. The dust and particle attachments attached to the surface of the aluminum product are cleaned by a brush, and then the aluminum product surface treated with the brush is rinsed by flowing water. The aluminum product workpiece is hung on a titanium hanger, and then the aluminum product workpiece is placed in a degreasing tank for degreasing. At the same time, the aluminum product workpiece can be assisted by ultrasound to remove oil, and the surface of the aluminum product workpiece is cleaned by sodium hydroxide solution. This operation can As a supplementary treatment after degreasing of aluminum workpieces, the oil and dirt attached to the surface can be further cleaned, and the gray or black dust attached to the surface of the aluminum workpiece after alkaline etching can be treated with an acidic solution. At the same time, the alkali solution remaining on the surface of the aluminum workpiece can be neutralized, and then the surface of the aluminum workpiece is rinsed with water, and the treated aluminum workpiece is immersed in a solution of a brightening agent, and the brightening operation is performed in a set processing environment. After the brightening operation is completed, the surface of the aluminum workpiece is rinsed and dried with pure water, and the processed aluminum workpiece is used as an anode, and then the aluminum The workpiece is immersed in the electrolyte, and an oxide layer can be formed on the surface of the workpiece when the power is turned on. After rinsing with pure water, an aluminum workpiece with an oxide film can be obtained. The anodized oxide film of the aluminum product is expanded and a fluoropolymer is introduced. The fluoropolymer and the aluminum alloy hard anodized film are fused into one by vacuum heat treatment to form a synergistic coating. The aluminum workpiece with the synergistic coating needs to be rinsed with pure water. The aluminum workpiece is immersed in the electrolyte, and different color matching chemical raw materials are added to the electrolyte. After power is turned on, the colored surface of the aluminum workpiece is directly obtained through the chemical reaction of the added chemical raw materials. Oxide film can be formed, thereby completing the electrolytic coloring of aluminum workpieces. The colored aluminum workpieces are first thoroughly rinsed with hot water, and then the surface of the aluminum workpieces is rinsed with pure water, and then the aluminum workpieces are placed in an electrophoresis tank for electrophoresis operation. The aluminum workpieces after electrophoresis treatment are immersed in neutral hot water for sealing operation. After the sealing is completed, the aluminum workpieces can be rinsed with pure water, so that the neutral solution on the surface of the aluminum workpieces can be rinsed clean, and the aluminum workpieces are dried through a drying device. This is the characteristic of the high-temperature resistant anodic hard aluminum oxidation production method.

[0058] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for producing high temperature resistant anodic hard aluminum oxide, characterized in that: The following steps are involved: S1: Pretreatment of aluminum products: first, grind the burrs on the surface of aluminum products, and remove the oxide scale on the surface of aluminum alloy by sandblasting; S2: Cleaning of aluminum products: Use a brush to clean the dust and particles attached to the surface of the aluminum products, and then rinse the aluminum product surface treated by the brush with flowing water; S3: Degreasing and oil removal of aluminum products. Hang the aluminum workpiece on the titanium hanger, then put the aluminum workpiece into the degreasing tank for degreasing. At the same time, ultrasonic degreasing can be assisted; S4: Alkaline etching treatment of aluminum products. The surface of the aluminum product workpiece is cleaned by sodium hydroxide solution. This operation can be used as a supplementary treatment after the aluminum product workpiece is degreased, and the oil and dirt attached to the surface can be further cleaned; S5: Aluminum product neutralization treatment, using acidic solution to treat the gray or black ash attached to the surface of aluminum products after alkaline etching, and at the same time neutralize the alkali solution remaining on the surface of aluminum products, and then rinse the surface of aluminum products with water; S6: Polishing treatment of aluminum products: immerse the treated aluminum product workpiece in a solution of polishing agent and perform polishing operation in a set processing environment. After the polishing operation is completed, rinse the surface of the aluminum product workpiece with pure water and dry it; S7: Anodizing of aluminum products: The processed aluminum product workpiece is used as the anode, and then the aluminum product workpiece is immersed in the electrolyte. When the power is turned on, an oxide layer can be formed on the surface of the workpiece. After rinsing with pure water, an aluminum product workpiece with an oxide film can be obtained; S8: The oxide film is subjected to pore expansion treatment, and the anodized oxide film of the aluminum product is subjected to pore expansion treatment and fluoropolymer is introduced; S9: Vacuum heat treatment of the oxide layer. Through vacuum heat treatment, the fluoropolymer and the aluminum alloy hard anodized film are fused into one to form a synergistic coating. The aluminum workpiece with the synergistic coating needs to be rinsed with pure water; S10: electrolytic coloring of the oxide layer, immersing the aluminum workpiece in an electrolyte, adding different color matching chemical raw materials to the electrolyte, and directly obtaining a colored oxide film on the surface of the aluminum workpiece through a chemical reaction of the added chemical raw materials after power is turned on, thereby completing the electrolytic coloring of the aluminum workpiece; S11: Electrophoresis treatment of anodized aluminum products. The colored aluminum product workpiece is first thoroughly rinsed with hot water, then the surface of the aluminum product workpiece is rinsed with pure water, and then the aluminum product workpiece is placed in an electrophoresis tank for electrophoresis operation; S12: Sealing treatment of anodized aluminum products, immersing the aluminum product workpiece after electrophoresis treatment into neutral hot water for sealing operation; S13: Anodized aluminum product water washing treatment. After the sealing is completed, the aluminum product workpiece can be rinsed with pure water, so that the neutral solution on the surface of the aluminum product workpiece can be rinsed clean; S14: Drying treatment of anodized aluminum products: hanging the clean aluminum workpieces and drying the aluminum workpieces through a drying device.

2. The high temperature resistant anodic hard aluminum oxidation production method according to claim 1, characterized in that: The solution used for degreasing in S3 is a diluted aqueous sulfuric acid solution with a concentration of 60-120 g / l, a set temperature of 20-30°, a degreasing time of 5-10 minutes, and the degreasing in S3 can be performed using organic solvent degreasing, surfactant degreasing, alkaline solution degreasing, acid solution degreasing, electrolytic degreasing and emulsified degreasing.

3. The high temperature resistant anodic hard aluminum oxidation production method according to claim 1, characterized in that: The alkaline etching bath solution in S4 is a liquid alkali prepared with sodium hydroxide and water at a concentration of 20 to 80 g / l. The working temperature is set at 40 to 60°C and the working time is 0.5 to 5 minutes. The role of alkaline etching is to further clean the oil and dirt attached to the surface, remove the natural oxide film and slight scratches on the surface of the product, so that the product exposes a pure metal matrix, which is beneficial to the formation of the anodic film and obtains a higher quality film layer.

4. The high temperature resistant anodic hard aluminum oxidation production method according to claim 1, characterized in that: The S6 neutralization solution uses a sulfuric acid aqueous solution with a concentration of 80-140 g / l. According to 1000 m2 of aluminum hangers, 0.5 kg of a brightening agent with oxalic acid as the main raw material is added. The working temperature is set at 20-30° and the working time is 3-5 minutes.

5. The method for producing high temperature resistant anodic hard aluminum oxidation according to claim 1, characterized in that: The electrolyte in S7 uses a sulfuric acid aqueous solution with a concentration of 180-220 g / l, and 1 kg of oxidant is added according to 100 m2 of aluminum hangers. The working temperature is set at 20-30°C, the electrolysis current density is set at 1.2-1.5 A / dm2, and sulfonated anthracene is mixed in the electrolyte.

6. The method for producing high temperature resistant anodic hard aluminum oxidation according to claim 1, characterized in that: Introducing lubricants or sealants into the oxide film micropores and their surfaces in the S8 and / or the hard oxide film micropores and their surfaces that have been expanded is also one of the key steps in preparing the synergistic coating. The more and deeper the fluoropolymer particles enter the micropores, the better the overall performance of the synergistic coating will be. Various methods can be used to introduce lubricants such as fluoropolymers into the prepared aluminum alloy surface base layer.

7. The method for producing high temperature resistant anodic hard aluminum oxidation according to claim 1, characterized in that: The electrolytic coloring solution in S10 is added with an appropriate amount of NS-201 electrolytic coloring stabilizer, so that the coloring speed is higher than the coloring speed of the solution without adding stabilizer. This can reduce the Ni2+ concentration accordingly, thereby reducing the cost of the solution, while also improving the dispersibility of the solution and improving the uniformity of coloring. During electrolytic coloring, as the temperature increases, the ion diffusion speed accelerates and the color tone deepens. In order to make the coloring uniform, the tank liquid circulation stirring method is adopted to stir under the liquid surface.

8. The method for producing high temperature resistant anodic hard aluminum oxidation according to claim 1, characterized in that: The hot water washing temperature in S11 is set at 65-75 degrees, and the rinsing time is set to 4-5 minutes. The hot water rinsing is mainly used to expand the anodized film on the surface of the aluminum workpiece, thereby preventing impurity ions on the surface of the anodized film from contaminating the electrophoresis tank.

9. The method for producing high temperature resistant anodic hard aluminum oxidation according to claim 1, characterized in that: The temperature of the hot water in S12 is maintained above 85 degrees. In such a solution environment, alumina can be hydrated to form alumina monohydrate. The density of alumina monohydrate is lower than that of alumina, and the volume increases by about 33%, thereby blocking the pores of the oxide film.

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