A deformation-resistant aluminum alloy for keel and its processing technology

Abstract

This invention relates to the field of aluminum alloy materials technology, specifically to a deformation-resistant aluminum alloy for keel frames and its processing technology. The invention first uses aluminum alloy powder as the main raw material, then adds boron nitride to prepare an alloy coating. The addition of boron nitride increases the hardness of the alloy coating. Then, a laser is used to laser-clad the aluminum alloy substrate surface to form an alloy coating, improving the strength of the aluminum alloy and giving it good deformation resistance. During anodizing, the aluminum alloy parts are immersed in an electrolyte containing a silica-metal-organic framework composite material, forming a dense oxide film on the aluminum alloy surface. The addition of the silica-metal-organic framework composite material improves the corrosion resistance and surface hardness of the aluminum alloy.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy materials technology, specifically to a deformation-resistant aluminum alloy for keel frames and its processing technology. Background Technology

[0002] As a crucial component of building structures, keels are typically made of steel. However, steel keels suffer from drawbacks such as heavy weight and susceptibility to rust, limiting their use in certain specialized applications. Therefore, people have begun experimenting with lightweight, corrosion-resistant aluminum alloys to replace traditional steel keels. However, aluminum alloy keels currently on the market still present some problems during long-term use. The main issue is that aluminum alloys are prone to deformation, especially in large building structures, where the keel may bend and deform under load, affecting the overall stability and lifespan of the building. Furthermore, to withstand extreme natural disasters, the corrosion resistance of aluminum alloy keels needs further improvement.

[0003] To address the aforementioned problems and improve the mechanical and corrosion resistance properties of aluminum alloys used for keel construction, this invention provides a deformation-resistant aluminum alloy for keel construction and its processing technology. Summary of the Invention

[0004] The purpose of this invention is to provide a deformation-resistant aluminum alloy for keel and its processing technology, so as to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A processing method for a deformation-resistant aluminum alloy used for keel supports includes the following steps:

[0007] Step 1: Take aluminum, magnesium, silicon, iron, manganese, titanium, zinc, chromium and copper, melt, refine and degas, cast ingots, heat to 580-600℃, hold for 10-12 hours, cool to obtain aluminum alloy matrix;

[0008] Step 2: Apply alloy coating to the surface of aluminum alloy substrate and dry it at 30-40℃. Then, use a laser to laser treat the aluminum alloy substrate with a laser power of 2-3kW to obtain the aluminum alloy treated part.

[0009] Step 3: Clean and dry the aluminum alloy parts, and then perform anodizing treatment to obtain a deformation-resistant aluminum alloy for keel.

[0010] A more optimized method for preparing the alloy coating is as follows: take aluminum alloy powder and boron nitride, grind them evenly, add polyvinyl alcohol, and stir for 30-40 minutes to obtain the alloy coating.

[0011] In a more optimized manner, the electrolyte used for the anodizing process includes the following components: sulfuric acid, malic acid, disodium ethylenediaminetetraacetate, silica-metal-organic framework composite material, and deionized water.

[0012] A more optimized method for preparing the silica-metal-organic framework composite material is as follows: N, N-dimethylformamide, and methanol are mixed evenly, tartaric acid-loaded nano-silica is added, and ultrasonic dispersion is carried out for 1-2 hours. Aminoterephthalic acid, tetrabutyl titanate, ammonia, and cerium ammonium nitrate are added, and ultrasonic dispersion is continued for 1-2 hours. The temperature is raised to 147-150℃ and kept at that temperature for 14-16 hours. The mixture is then centrifuged, washed, and dried to obtain the silica-metal-organic framework composite material.

[0013] A more optimized method for preparing the tartaric acid-loaded nano-silica is as follows: tartaric acid and deionized water are taken, stirred evenly, mesoporous nano-silica and ethanol are added, stirred for 6-8 hours, 5 mL of ammonia water is added, the temperature is raised to 55-60℃, tetraethyl orthosilicate is added, the reaction is carried out for 2-3 hours, and the temperature is lowered to 25-35℃ to obtain tartaric acid-loaded nano-silica.

[0014] A more optimized method for preparing the mesoporous nano-silica is as follows: hexadecyltrimethylammonium bromide is added to deionized water and stirred for 10-15 min. Then, diethyl ether, ethanol, and ammonia are added and stirred for 30-40 min. Tetraethyl orthosilicate and 3-mercaptopropyltrimethoxysilane are added dropwise, and stirring is continued for 3-4 h. The mixture is then centrifuged, washed, and dried to obtain mesoporous nano-silica.

[0015] More preferably, the aluminum alloy matrix comprises the following components, by weight percentage: 4.0-4.5% magnesium,

[0016] 0.1-0.2% silicon, 0.01-0.2% iron, 0.75-0.85% manganese, 0.004-0.1% titanium, 0.001-0.2% zinc,

[0017] 0.01-0.015% chromium, 0.001-0.1% copper, 0.001-0.1% impurities, balance aluminum.

[0018] The optimal operating conditions for the anodizing process are: 1kW AC power supply, 0.3A constant current, 100Hz frequency, and 5-10min time.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] (1) In this invention, aluminum alloy powder is first used as the main raw material, and then boron nitride is added to prepare an alloy coating. The addition of boron nitride increases the hardness of the alloy coating. Then, a laser is used to laser clad on the surface of the aluminum alloy substrate to form an alloy coating, which improves the strength of the aluminum alloy and gives it good deformation resistance.

[0021] (2) When the aluminum alloy parts are anodized, they are immersed in an electrolyte containing silica-metal-organic framework composite material for treatment, forming a dense oxide film on the surface of the aluminum alloy. The addition of silica-metal-organic framework composite material improves the corrosion resistance of the aluminum alloy and increases the hardness and wear resistance of the aluminum alloy surface.

[0022] This invention uses tetrabutyl titanate and cerium ammonium nitrate to prepare a metal-organic framework material, which is then combined with nano-silica loaded with tartaric acid. The loading of nano-silica improves the dispersibility of the organic framework, further enhancing the mechanical properties and corrosion resistance of the aluminum alloy.

[0023] (3) Existing anodizing typically uses sulfuric acid as the electrolyte. During the oxidation reaction at the anode, the local pH drops significantly, accelerating the dissolution of the film. The resulting oxide film on the aluminum alloy surface becomes porous and its corrosion resistance deteriorates. This invention first prepares a mesoporous nano-silica, then loads tartaric acid into the pores of the mesoporous nano-silica. The large specific surface area of ​​the mesoporous nano-silica allows it to load more tartaric acid. During the anodizing process, aluminum ions are generated in the aluminum alloy parts. These ions react with the tartaric acid in the nano-silica to form aluminum tartrate. The aluminum tartrate precipitates in the pores of the nano-silica. When the keel-made deformation-resistant aluminum alloy is in a corrosive environment, the aluminum tartrate acts as a buffer, thus providing corrosion protection and enhancing the corrosion resistance of the aluminum alloy. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] There are no special restrictions on the suppliers of any of the raw materials involved in this invention. Exemplary examples include: boron nitride: h-BN, particle size: 50-100nm, which can be purchased from Shanghai Chaowei Nanotechnology Co., Ltd.; aluminum alloy powder: AlSi10Mg powder, particle size: 100-150μm, which can be purchased from Nantong Heyuan Intelligent Technology Co., Ltd.; tetraethyl orthosilicate: which can be purchased from Aladdin; tartaric acid: which can be purchased from Shanghai Yuanye Biotechnology Co., Ltd., item number: S30452; aminoterephthalic acid: which can be purchased from Aladdin: 2-aminoterephthalic acid, item number: A824727; tetrabutyl titanate: which can be purchased from Aladdin, item number: T104105; cerium ammonium nitrate: which can be purchased from Sigma-Aldrich, item number: C3654; nano silica: which can be purchased from Merck, item number: 637238.

[0026] Example 1: A processing technology for a deformation-resistant aluminum alloy for keel, comprising the following steps:

[0027] Step 1: Preparation of the aluminum alloy substrate:

[0028] Aluminum, magnesium, silicon, iron, manganese, titanium, zinc, chromium and copper are taken, smelted, refined and degassed, cast into ingots, heated to 590℃, held for 11 hours, and cooled to obtain an aluminum alloy matrix.

[0029] The aluminum alloy matrix comprises the following components, by weight percentage:

[0030] 4.5% magnesium, 0.2% silicon, 0.2% iron, 0.75% manganese, 0.1% titanium, 0.2% zinc, 0.015% chromium, 0.1% copper, 0.1% impurities, balance aluminum;

[0031] Step Two: Preparation of Aluminum Alloy Parts

[0032] Take 95g of aluminum alloy powder and 5g of boron nitride, grind them evenly, add 0.2g of polyvinyl alcohol, stir for 35 minutes to obtain alloy coating;

[0033] Alloy coating is applied to the surface of an aluminum alloy substrate with a coating thickness of 0.5 mm and dried at 35°C. Then, the aluminum alloy substrate is laser-treated using a laser with a laser power of 2 kW to obtain an aluminum alloy treated part.

[0034] Step 3: Preparation of Deformation-Resistant Aluminum Alloy for Keel:

[0035] The aluminum alloy parts are cleaned, dried, and then anodized to obtain a deformation-resistant aluminum alloy for keel.

[0036] The working conditions for anodizing are: AC power supply of 1kW, constant current of 0.3A, frequency of 100Hz, and time of 8min;

[0037] The electrolyte used for anodizing includes the following components: 6g sulfuric acid, 6g malic acid, 55g disodium ethylenediaminetetraacetate, 12g silica-metal-organic framework composite material, and 1L deionized water;

[0038] The preparation method of silica-metal-organic framework composite material is as follows: including the following steps:

[0039] S1: Preparation of tartaric acid-loaded nano-silica:

[0040] Add 1.3g of hexadecyltrimethylammonium bromide to 100mL of deionized water and stir for 12min. Add 35mL of diethyl ether, 15mL of ethanol and 3mL of ammonia and stir for 35min. Add 5.5mL of tetraethyl orthosilicate and 0.2mL of 3-mercaptopropyltrimethoxysilane dropwise and continue stirring for 3.5h. Centrifuge, wash and dry to obtain mesoporous nano silica.

[0041] Take 5g of tartaric acid and 10mL of deionized water, stir well, add 0.6g of mesoporous nano silica and 20mL of ethanol, stir for 7h, add 5mL of ammonia, heat to 57℃, add 1.5g of tetraethyl orthosilicate, react for 2.5h, cool to 30℃, and obtain nano silica loaded with tartaric acid.

[0042] S2: Preparation of silica-metal-organic framework composite materials:

[0043] Take 10 mL of N,N-dimethylformamide and 1 mL of methanol, mix them evenly, add 40 mg of tartaric acid-loaded nano-silica, and ultrasonically disperse for 1.5 h. Add 500 mg of aminoterephthalic acid, 250 μL of tetrabutyl titanate, 100 μL of ammonia water and 10 mg of cerium ammonium nitrate, and continue ultrasonic dispersion for 1.5 h. React at 150 °C for 15 h, centrifuge, wash and dry to obtain silica-metal-organic framework composite material.

[0044] Example 2: A processing technology for a deformation-resistant aluminum alloy for keel, comprising the following steps:

[0045] Step 1: Preparation of the aluminum alloy substrate:

[0046] Aluminum, magnesium, silicon, iron, manganese, titanium, zinc, chromium and copper are taken, smelted, refined and degassed, cast into ingots, heated to 580℃, held for 10 hours, and cooled to obtain an aluminum alloy matrix.

[0047] The aluminum alloy matrix comprises the following components, by weight percentage:

[0048] 4.5% magnesium, 0.2% silicon, 0.2% iron, 0.75% manganese, 0.1% titanium, 0.2% zinc, 0.015% chromium, 0.1% copper, 0.1% impurities, balance aluminum;

[0049] Step Two: Preparation of Aluminum Alloy Parts

[0050] Take 95g of aluminum alloy powder and 5g of boron nitride, grind them evenly, add 0.2g of polyvinyl alcohol, stir for 30 minutes to obtain alloy coating;

[0051] An alloy coating is applied to the surface of an aluminum alloy substrate with a coating thickness of 0.5 mm. The coating is dried at 30°C. Then, the aluminum alloy substrate is laser-treated using a laser with a laser power of 2 kW to obtain an aluminum alloy treated part.

[0052] Step 3: Preparation of Deformation-Resistant Aluminum Alloy for Keel:

[0053] The aluminum alloy parts are cleaned, dried, and then anodized to obtain a deformation-resistant aluminum alloy for keel.

[0054] The working conditions for anodizing are: AC power supply of 1kW, constant current of 0.3A, frequency of 100Hz, and time of 5min;

[0055] The electrolyte used for anodizing includes the following components: 6g sulfuric acid, 6g malic acid, 55g disodium ethylenediaminetetraacetate, 12g silica-metal-organic framework composite material, and 1L deionized water;

[0056] The preparation method of silica-metal-organic framework composite material is as follows: including the following steps:

[0057] S1: Preparation of tartaric acid-loaded nano-silica:

[0058] Add 1.3g of hexadecyltrimethylammonium bromide to 100mL of deionized water and stir for 10min. Add 35mL of diethyl ether, 15mL of ethanol and 3mL of ammonia and stir for 30min. Add 5.5mL of tetraethyl orthosilicate and 0.2mL of 3-mercaptopropyltrimethoxysilane dropwise and continue stirring for 3h. Centrifuge, wash and dry to obtain mesoporous nano silica.

[0059] Take 5g of tartaric acid and 10mL of deionized water, stir well, add 0.6g of mesoporous nano silica and 20mL of ethanol, stir for 6h, add 5mL of ammonia water, heat to 55℃, add 1.5g of tetraethyl orthosilicate, react for 2h, cool to 25℃, and obtain nano silica loaded with tartaric acid.

[0060] S2: Preparation of silica-metal-organic framework composite materials:

[0061] Take 10 mL of N,N-dimethylformamide and 1 mL of methanol, mix them evenly, add 40 mg of tartaric acid-loaded nano-silica, and ultrasonically disperse for 1 h. Add 500 mg of aminoterephthalic acid, 250 μL of tetrabutyl titanate, 100 μL of ammonia water and 10 mg of cerium ammonium nitrate, and continue ultrasonic dispersion for 1 h. React at 150 °C for 14 h, centrifuge, wash and dry to obtain silica-metal-organic framework composite material.

[0062] Example 3: A processing technology for a deformation-resistant aluminum alloy for keel, comprising the following steps:

[0063] Step 1: Preparation of the aluminum alloy substrate:

[0064] Aluminum, magnesium, silicon, iron, manganese, titanium, zinc, chromium and copper are taken, smelted, refined and degassed, cast into ingots, heated to 600℃, held for 12 hours, and cooled to obtain an aluminum alloy matrix;

[0065] The aluminum alloy matrix comprises the following components, by weight percentage:

[0066] 4.5% magnesium, 0.2% silicon, 0.2% iron, 0.75% manganese, 0.1% titanium, 0.2% zinc, 0.015% chromium, 0.1% copper, 0.1% impurities, balance aluminum;

[0067] Step Two: Preparation of Aluminum Alloy Parts

[0068] Take 95g of aluminum alloy powder and 5g of boron nitride, grind them evenly, add 0.2g of polyvinyl alcohol, stir for 40min, and obtain alloy coating;

[0069] Alloy coating is applied to the surface of an aluminum alloy substrate with a coating thickness of 0.5 mm and dried at 40°C. Then, the aluminum alloy substrate is laser-treated using a laser with a laser power of 3 kW to obtain an aluminum alloy treated part.

[0070] Step 3: Preparation of Deformation-Resistant Aluminum Alloy for Keel:

[0071] The aluminum alloy parts are cleaned, dried, and then anodized to obtain a deformation-resistant aluminum alloy for keel.

[0072] The working conditions for anodizing are: AC power supply of 1kW, constant current of 0.3A, frequency of 100Hz, and time of 10min;

[0073] The electrolyte used for anodizing includes the following components: 6g sulfuric acid, 6g malic acid, 55g disodium ethylenediaminetetraacetate, 12g silica-metal-organic framework composite material, and 1L deionized water;

[0074] The preparation method of silica-metal-organic framework composite material is as follows: including the following steps:

[0075] S1: Preparation of tartaric acid-loaded nano-silica:

[0076] Add 1.3g of hexadecyltrimethylammonium bromide to 100mL of deionized water and stir for 15min. Add 35mL of diethyl ether, 15mL of ethanol and 3mL of ammonia and stir for 40min. Add 5.5mL of tetraethyl orthosilicate and 0.2mL of 3-mercaptopropyltrimethoxysilane dropwise and continue stirring for 4h. Centrifuge, wash and dry to obtain mesoporous nano silica.

[0077] Take 5g of tartaric acid and 10mL of deionized water, stir well, add 0.6g of mesoporous nano silica and 20mL of ethanol, stir for 8h, add 5mL of ammonia, heat to 60℃, add 1.5g of tetraethyl orthosilicate, react for 3h, cool to 35℃, and obtain nano silica loaded with tartaric acid.

[0078] S2: Preparation of silica-metal-organic framework composite materials:

[0079] Take 10 mL of N,N-dimethylformamide and 1 mL of methanol, mix them evenly, add 40 mg of tartaric acid-loaded nano-silica, and ultrasonically disperse for 2 h. Add 500 mg of aminoterephthalic acid, 250 μL of tetrabutyl titanate, 100 μL of ammonia water and 10 mg of cerium ammonium nitrate, and continue ultrasonic dispersion for 2 h. React at 150 °C for 16 h, centrifuge, wash and dry to obtain silica-metal-organic framework composite material.

[0080] Comparative Example 1: Nano-silica without tartaric acid loading, otherwise the same as in Example 1:

[0081] Step 1: Preparation of the aluminum alloy substrate:

[0082] Aluminum, magnesium, silicon, iron, manganese, titanium, zinc, chromium and copper are taken, smelted, refined and degassed, cast into ingots, heated to 590℃, held for 11 hours, and cooled to obtain an aluminum alloy matrix.

[0083] The aluminum alloy matrix comprises the following components, by weight percentage:

[0084] 4.5% magnesium, 0.2% silicon, 0.2% iron, 0.75% manganese, 0.1% titanium, 0.2% zinc, 0.015% chromium, 0.1% copper, 0.1% impurities, balance aluminum;

[0085] Step Two: Preparation of Aluminum Alloy Parts

[0086] Take 95g of aluminum alloy powder and 5g of boron nitride, grind them evenly, add 0.2g of polyvinyl alcohol, stir for 35 minutes to obtain alloy coating;

[0087] Alloy coating is applied to the surface of an aluminum alloy substrate with a coating thickness of 0.5 mm and dried at 35°C. Then, the aluminum alloy substrate is laser-treated using a laser with a laser power of 2 kW to obtain an aluminum alloy treated part.

[0088] Step 3: Preparation of Deformation-Resistant Aluminum Alloy for Keel:

[0089] The aluminum alloy parts are cleaned, dried, and then anodized to obtain a deformation-resistant aluminum alloy for keel.

[0090] The working conditions for anodizing are: AC power supply of 1kW, constant current of 0.3A, frequency of 100Hz, and time of 8min;

[0091] The electrolyte used for anodizing includes the following components: 6g sulfuric acid, 6g malic acid, 55g disodium ethylenediaminetetraacetate, 12g silica-metal-organic framework composite material, and 1L deionized water;

[0092] The preparation method of metal-organic framework composite materials includes the following steps:

[0093] Take 10 mL of N,N-dimethylformamide and 1 mL of methanol, mix them evenly, add 500 mg of aminoterephthalic acid, 250 μL of tetrabutyl titanate, 100 μL of ammonia water and 10 mg of cerium ammonium nitrate, continue to ultrasonically disperse for 1.5 h, react at 150 °C for 15 h, centrifuge, wash and dry to obtain metal-organic framework composite material.

[0094] Comparative Example 2: Tartaric acid was not loaded onto nano-silica; all other aspects were the same as in Example 1.

[0095] Step 1: Preparation of the aluminum alloy substrate:

[0096] Aluminum, magnesium, silicon, iron, manganese, titanium, zinc, chromium and copper are taken, smelted, refined and degassed, cast into ingots, heated to 590℃, held for 11 hours, and cooled to obtain an aluminum alloy matrix.

[0097] The aluminum alloy matrix comprises the following components, by weight percentage:

[0098] 4.5% magnesium, 0.2% silicon, 0.2% iron, 0.75% manganese, 0.1% titanium, 0.2% zinc, 0.015% chromium, 0.1% copper, 0.1% impurities, balance aluminum;

[0099] Step Two: Preparation of Aluminum Alloy Parts

[0100] Take 95g of aluminum alloy powder and 5g of boron nitride, grind them evenly, add 0.2g of polyvinyl alcohol, stir for 35 minutes to obtain alloy coating;

[0101] Alloy coating is applied to the surface of an aluminum alloy substrate with a coating thickness of 0.5 mm and dried at 35°C. Then, the aluminum alloy substrate is laser-treated using a laser with a laser power of 2 kW to obtain an aluminum alloy treated part.

[0102] Step 3: Preparation of Deformation-Resistant Aluminum Alloy for Keel:

[0103] The aluminum alloy parts are cleaned, dried, and then anodized to obtain a deformation-resistant aluminum alloy for keel.

[0104] The working conditions for anodizing are: AC power supply of 1kW, constant current of 0.3A, frequency of 100Hz, and time of 8min;

[0105] The electrolyte used for anodizing includes the following components: 6g sulfuric acid, 6g malic acid, 55g disodium ethylenediaminetetraacetate, 12g silica-metal-organic framework composite material, and 1L deionized water;

[0106] The preparation method of silica-metal-organic framework composite material is as follows: including the following steps:

[0107] S1: Preparation of mesoporous nano-silica:

[0108] Add 1.3g of hexadecyltrimethylammonium bromide to 100mL of deionized water and stir for 12min. Add 35mL of diethyl ether, 15mL of ethanol and 3mL of ammonia and stir for 35min. Add 5.5mL of tetraethyl orthosilicate and 0.2mL of 3-mercaptopropyltrimethoxysilane dropwise and continue stirring for 3.5h. Centrifuge, wash and dry to obtain mesoporous nano silica.

[0109] S2: Preparation of silica-metal-organic framework composite materials:

[0110] Take 10 mL of N,N-dimethylformamide and 1 mL of methanol, mix them evenly, add 50 mg of mesoporous nano silica, and ultrasonically disperse for 1.5 h. Add 500 mg of aminoterephthalic acid, 250 μL of tetrabutyl titanate, 100 μL of ammonia water and 10 mg of cerium ammonium nitrate, and continue ultrasonic dispersion for 1.5 h. React at 150 °C for 15 h, centrifuge, wash and dry to obtain silica-metal-organic framework composite material.

[0111] Comparative Example 3: Nano-silica was used instead of mesoporous nano-silica, and the rest was the same as in Example 1:

[0112] Step 1: Preparation of the aluminum alloy substrate:

[0113] Aluminum, magnesium, silicon, iron, manganese, titanium, zinc, chromium and copper are taken, smelted, refined and degassed, cast into ingots, heated to 590℃, held for 11 hours, and cooled to obtain an aluminum alloy matrix.

[0114] The aluminum alloy matrix comprises the following components, by weight percentage:

[0115] 4.5% magnesium, 0.2% silicon, 0.2% iron, 0.75% manganese, 0.1% titanium, 0.2% zinc, 0.015% chromium, 0.1% copper, 0.1% impurities, balance aluminum;

[0116] Step Two: Preparation of Aluminum Alloy Parts

[0117] Take 95g of aluminum alloy powder and 5g of boron nitride, grind them evenly, add 0.2g of polyvinyl alcohol, stir for 35 minutes to obtain alloy coating;

[0118] Alloy coating is applied to the surface of an aluminum alloy substrate with a coating thickness of 0.5 mm and dried at 35°C. Then, the aluminum alloy substrate is laser-treated using a laser with a laser power of 2 kW to obtain an aluminum alloy treated part.

[0119] Step 3: Preparation of Deformation-Resistant Aluminum Alloy for Keel:

[0120] The aluminum alloy parts are cleaned, dried, and then anodized to obtain a deformation-resistant aluminum alloy for keel.

[0121] The working conditions for anodizing are: AC power supply of 1kW, constant current of 0.3A, frequency of 100Hz, and time of 8min;

[0122] The electrolyte used for anodizing includes the following components: 6g sulfuric acid, 6g malic acid, 55g disodium ethylenediaminetetraacetate, 12g silica-metal-organic framework composite material, and 1L deionized water;

[0123] The preparation method of silica-metal-organic framework composite material is as follows: including the following steps:

[0124] S1: Preparation of tartaric acid-loaded nano-silica:

[0125] Take 5g of tartaric acid and 10mL of deionized water, stir well, add 0.6g of nano silica and 20mL of ethanol, stir for 7h, add 5mL of ammonia, heat to 57℃, add 1.5g of tetraethyl orthosilicate, react for 2.5h, cool to 30℃, and obtain nano silica loaded with tartaric acid.

[0126] S2: Preparation of silica-metal-organic framework composite materials:

[0127] Take 10 mL of N,N-dimethylformamide and 1 mL of methanol, mix them evenly, add 40 mg of tartaric acid-loaded nano-silica, and ultrasonically disperse for 1.5 h. Add 500 mg of aminoterephthalic acid, 250 μL of tetrabutyl titanate, 100 μL of ammonia water and 10 mg of cerium ammonium nitrate, and continue ultrasonic dispersion for 1.5 h. React at 150 °C for 15 h, centrifuge, wash and dry to obtain silica-metal-organic framework composite material.

[0128] experiment:

[0129] The deformation-resistant aluminum alloys for keel preparations from Examples 1 to 3 and Comparative Examples 1 to 3 were subjected to performance testing. The mechanical properties of the aluminum alloys were tested at 25°C using a digital tensile testing machine at a tensile speed of 1 mm / min. The aluminum alloy samples were prepared in parallel directions with a gauge length of 1 mm, a gauge width of 3.5 mm, and a thickness of 2 mm. Samples of 200 mm × 120 mm × 1 mm were prepared. The salt spray resistance of the aluminum alloys at 35°C was tested according to GB / T1771-2007, with a sodium chloride concentration of 60 g / L and a pH of 6.8-7.2. After 90 days, the corrosion resistance of the aluminum alloys was observed, and the results are shown in the table below.

[0130]

[0131] Conclusions: In Comparative Example 1, the lack of tartaric acid-loaded nano-silica significantly reduced the corrosion resistance of the aluminum alloy. In Comparative Example 2, the absence of tartaric acid loading on the nano-silica resulted in a small amount of rust spots appearing on the aluminum alloy surface. In Comparative Example 3, the use of nano-silica instead of mesoporous nano-silica reduced the amount of tartaric acid loaded on the nano-silica, leading to a decrease in the corrosion resistance of the aluminum alloy. Examples 1 to 3 used aluminum alloy powder as the main raw material, then added boron nitride to prepare an alloy coating. The addition of boron nitride increased the hardness of the alloy coating. Laser cladding was then used to form an alloy coating on the aluminum alloy substrate surface, improving the tensile strength of the aluminum alloy and giving it good mechanical properties. This invention uses tetrabutyl titanate and cerium ammonium nitrate to prepare a metal-organic framework material, which was then combined with tartaric acid-loaded nano-silica. The loading of nano-silica improved the dispersibility of the organic framework, further enhancing the mechanical properties and corrosion resistance of the aluminum alloy.

[0132] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A processing technology for a deformation-resistant aluminum alloy used in keel construction, characterized in that: Includes the following steps: Step 1: Take aluminum, magnesium, silicon, iron, manganese, titanium, zinc, chromium and copper, melt, refine and degas, cast ingots, heat to 580-600℃, hold for 10-12 hours, cool to obtain aluminum alloy matrix; Step 2: Apply alloy coating to the surface of aluminum alloy substrate and dry it at 30-40℃. Then, use a laser to laser treat the aluminum alloy substrate with a laser power of 2-3kW to obtain the aluminum alloy treated part. Step 3: Clean and dry the aluminum alloy parts, and then perform anodizing treatment to obtain a deformation-resistant aluminum alloy for keel; The alloy coating is prepared by: taking aluminum alloy powder and boron nitride, grinding them evenly, adding polyvinyl alcohol, and stirring for 30-40 minutes to obtain the alloy coating. The electrolyte used for the anodic oxidation includes the following components: sulfuric acid, malic acid, disodium ethylenediaminetetraacetate, silica-metal-organic framework composite material, and deionized water; The preparation method of the silica-metal-organic framework composite material is as follows: N, N-dimethylformamide and methanol are mixed evenly, tartaric acid-loaded nano-silica is added, ultrasonically dispersed for 1-2 hours, aminoterephthalic acid, tetrabutyl titanate, ammonia and cerium ammonium nitrate are added, ultrasonic dispersion is continued for 1-2 hours, the temperature is raised to 147-150℃ and kept at the temperature for 14-16 hours, centrifuged, washed and dried to obtain the silica-metal-organic framework composite material; The method for preparing tartaric acid-loaded nano-silica is as follows: take tartaric acid and deionized water, stir evenly, add mesoporous nano-silica and ethanol, stir for 6-8 hours, add 5 mL of ammonia water, heat to 55-60℃, add tetraethyl orthosilicate, react for 2-3 hours, cool to 25-35℃, and obtain tartaric acid-loaded nano-silica. The method for preparing the mesoporous nano-silica is as follows: hexadecyltrimethylammonium bromide is added to deionized water and stirred for 10-15 min. Then, diethyl ether, ethanol and ammonia are added and stirred for 30-40 min. Tetraethyl orthosilicate and 3-mercaptopropyltrimethoxysilane are added dropwise and stirred for 3-4 h. The mixture is then centrifuged, washed, and dried to obtain mesoporous nano-silica.

2. The processing technology of a deformation-resistant aluminum alloy for keel as described in claim 1, characterized in that: The aluminum alloy matrix comprises the following components, by weight percentage: 4.0-4.5% magnesium, 0.1-0.2% silicon, 0.01-0.2% iron, 0.75-0.85% manganese, 0.004-0.1% titanium, 0.001-0.2% zinc, 0.01-0.015% chromium, 0.001-0.1% copper, 0.001-0.1% impurities, with the balance being aluminum.

3. The processing technology of a deformation-resistant aluminum alloy for keel as described in claim 1, characterized in that: The working conditions for anodizing are: AC power supply of 1kW, constant current of 0.3A, frequency of 100Hz, and time of 5-10min.

4. A deformation-resistant aluminum alloy for keel obtained by processing according to any one of claims 1-3.

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