Rare earth aluminum alloy material and preparation method thereof

Abstract

The invention discloses a rare earth aluminum alloy material and a preparation method thereof, and relates to the field of metal materials. When the rare earth aluminum alloy material is prepared, aluminum, iron, magnesium, zinc and silicon dioxide are mixed, lanthanum and cerium are added, casting molding is conducted, annealing and cold rolling treatment are conducted, and an aluminum alloy plate is prepared; the preparation method comprises the following steps: firstly reacting 2-allyl phenol with sodium methoxide, then reacting with 2-sulfydryl-6-nitrobenzothiazole and finally reacting with 4-(2-pyridyl) benzoyl chloride to prepare an ultraviolet absorption monomer; the preparation method comprises the following steps: carrying out ultrasonic treatment on an aluminum alloy plate in a hydrochloric acid solution, polymerizing N-methylallylamine, an ultraviolet absorption monomer and 1-propylene on the surface of the aluminum alloy plate, and carrying out surface treatment by utilizing allyldimethoxysilane and dimethoxydimethylsilane to prepare the rare earth aluminum alloy material. The prepared rare earth aluminum alloy material has waterproof, corrosion-resistant and aging-resistant capabilities.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of metal materials, in particular to a rare earth aluminum alloy material and a preparation method thereof. BACKGROUND

[0002] Aluminum alloy is an alloy with aluminum as the base and adding a certain amount of other alloying elements, which is one of light metal materials. In addition to the general characteristics of aluminum, aluminum alloy has some specific characteristics of alloy due to the difference in the type and amount of alloying elements added. Aluminum alloy has high strength, specific strength close to high alloy steel, and specific rigidity exceeding steel, and can be used as a structural material, which has a wide range of applications in aerospace, aviation, transportation, construction, machinery, light industry and daily necessities.

[0003] Water has a certain corrosion effect on aluminum alloy, mainly because the surface of aluminum alloy is easily corroded by oxide, which combines with oxygen in water to form an aluminum oxide film. The surface of this film is easily exposed to water, and thus corroded by other elements in water, causing corrosion damage to aluminum alloy parts, thereby affecting the use effect. Therefore, the present application introduces a rare earth aluminum alloy material with waterproof ability and a preparation method thereof. SUMMARY

[0004] The purpose of the present application is to provide a rare earth aluminum alloy material and a preparation method thereof to solve the problems in the prior art.

[0005] A rare earth aluminum alloy material is prepared by ultrasonicating an aluminum alloy plate in a hydrochloric acid solution, then polymerizing N-methylallylamine, an ultraviolet absorbing monomer and 1-propylene on the surface of the aluminum alloy plate, and then performing surface treatment again with allyl dimethoxysilane and dimethoxydimethylsilane.

[0006] The aluminum alloy plate is prepared by mixing aluminum, iron, magnesium, zinc and silicon dioxide, adding lanthanum and cerium, pouring into a mold, and then performing annealing and cold rolling treatment.

[0007] The ultraviolet absorbing monomer is prepared by reacting 2-allylphenol with sodium methoxide, then with 2-mercapto-6-nitrobenzothiazole, and finally with 4-(2-pyridyl)benzoyl chloride.

[0008] A preparation method of a rare earth aluminum alloy material mainly includes the following preparation steps:

[0009] (1) placing at 575-585 ℃ for 11.5-12.5 h, cold rolling 7-9 times, then placing at 445-455 ℃ for 35-45 min to prepare an aluminum alloy rough plate;

[0010] (2) UV absorption monomer precursor, tetrahydrofuran and triethylamine are mixed in a molar ratio of 1:28-32:1.1-1.3, stirred at 200-300 r / min under nitrogen protection for 18-22 min, cooled to 1-3 ℃, 4-(2-pyridyl) benzoyl chloride is added at a uniform speed within 14-16 min at 1.1-1.2 times the molar amount of the UV absorption monomer precursor, warmed to 48-52 ℃, and stirred for 5.5-6.5 h, vacuum dried at 70-76 ℃ for 22-24 h, washed with deionized water for 8-10 times, and dried to obtain the UV absorption monomer;

[0011] (3) Sodium dodecyl sulfate, deionized water, UV absorption monomer, N-methylallylamine, 1-propylene are mixed in a mass ratio of 1:30-40:9-11:5-7:14-16, stirred at 58-62 ℃ and 200-300 r / min for 8-12 min, an initiator is added at a uniform speed within 12-14 min at an amount equal to that of the sodium dodecyl sulfate, and stirring is continued for 3-4 h to obtain the surface treatment liquid;

[0012] (4) The modified aluminum alloy plate is immersed in an allyl dimethoxysilane solution for 2-3 min, taken out, vacuum dried at 45-55 ℃ for 4-5 h, taken out, ultrasonically treated in a siloxane mixture for 5-6 min, taken out, vacuum dried at 45-55 ℃ for 4-5 h, ultrasonically treated in a siloxane mixture for 5-6 min again, taken out, vacuum dried at 45-55 ℃ for 4-5 h, and taken out to obtain the rare earth aluminum alloy material.

[0013] Preferably, the aluminum alloy rough plate in step (1) is prepared by mixing aluminum, iron, magnesium, zinc and silicon dioxide in a mass ratio of 108-112:2-3:1-2:3-4:4-5, melting at 745-755 ℃ for 18-22 min, adding lanthanum in an amount of 0.04-0.06 times the mass of aluminum and cerium in an amount of 0.04-0.06 times the mass of aluminum, stirring at 200-300 r / min for 40-50 min, passing a mixed gas, and continuing to stir for 40-50 min to obtain the aluminum alloy rough plate.

[0014] Preferably, the mixed gas is prepared by uniformly mixing argon, nitrogen and carbon monoxide in a volume ratio of 1:1:1.

[0015] Preferably, the UV absorbing monomer precursor in step (2) is prepared by mixing 2-allyl phenol, sodium methoxide and toluene in a molar ratio of 1:1:20-30, stirring at 64-66℃, 200-300r / min under nitrogen protection for 55-65min, vacuum drying at 50-60℃ for 23-25h, mixing allyl phenol sodium salt, 2-mercapto-6-nitrobenzothiazole and toluene in a molar ratio of 1:1:26-30, stirring at 64-66℃, 200-300r / min under nitrogen protection for 8.5-9.5h, cooling to room temperature, and vacuum drying at 75-85℃ for 23-25h.

[0016] Preferably, the drying in step (2) is performed by vacuum drying at -5-5℃ for 23-25h.

[0017] Preferably, the initiator in step (3) is prepared by uniformly mixing potassium persulfate and deionized water in a mass ratio of 1:10.

[0018] Preferably, the siloxane mixture in step (4) is prepared by uniformly mixing dimethoxydimethylsilane, acetone and 0.1mol / L hydrochloric acid solution in a mass ratio of 4-6:8-10:1.8-2.2.

[0019] Preferably, the allyl dimethoxy silane solution in step (4) is prepared by uniformly mixing allyl dimethoxy silane and acetone in a mass ratio of 1:8-10.

[0020] Preferably, the modified aluminum alloy plate in step (4) is prepared by immersing the aluminum alloy plate in a 2-2.4mol / L hydrochloric acid solution for 5-7min, ultrasonicating in deionized water for 8-10min, drying at 80-90℃ for 6-7h, uniformly applying the surface treatment liquid on the surface of the aluminum alloy plate, drying at 50-70℃ for 24-26h, and repeating the application and drying for 1-2 times.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] In the preparation of the rare earth aluminum alloy material, aluminum, iron, magnesium, zinc and silicon dioxide are mixed, lanthanum and cerium are added, and then the mixture is poured into a mold, annealed and cold-rolled to obtain an aluminum alloy plate; 2-allyl phenol is reacted with sodium methoxide, then with 2-mercapto-6-nitrobenzothiazole, and finally with 4-(2-pyridyl)benzoyl chloride to obtain a UV absorbing monomer; the aluminum alloy plate is ultrasonicated in a hydrochloric acid solution, N-methylallylamine, the UV absorbing monomer and 1-propylene are polymerized on the surface of the aluminum alloy plate, and then allyl dimethoxy silane and dimethoxydimethylsilane are used for surface treatment again to obtain the rare earth aluminum alloy material.

[0023] Firstly, aluminum, iron, magnesium, zinc, silicon dioxide are mixed and then lanthanum and cerium are added, and then the mixture is cast into a shape, and then annealing and cold rolling treatment are performed to obtain an aluminum alloy plate; the annealing treatment can refine the grains, improve or eliminate the residual stress generated in the casting, forging, rolling and welding processes, remove internal defects, and improve the mechanical properties of the material.

[0024] Secondly, the ultraviolet absorption monomer is prepared by reacting 2-allyl phenol with sodium methoxide, then with 2-mercapto-6-nitrobenzothiazole, and finally with 4-(2-pyridyl) benzoyl chloride; the 2-allyl phenol is first reacted with sodium methoxide, then with 2-mercapto-6-nitrobenzothiazole, and finally with 4-(2-pyridyl) benzoyl chloride to form a mercapto ester compound with a benzoheterocyclic ring, and the lone pair of electrons on the sulfur atom can combine with the free radicals generated in the oxidation process to form a stable compound, thereby blocking the propagation of the oxidation chain reaction, and the presence of the sulfur atom reduces the rigidity of the phenyl benzothiazole structure by reducing the lone pair of electrons, increases the relative molecular mass of the compound, and improves the stability, so that the material has better aging resistance; at the same time, the synthesized ultraviolet absorption monomer contains double bonds and pyridine groups, the double bonds are easy to polymerize with other alkene-containing monomers, and the pyridine can have a better bonding effect with the aluminum alloy plate.

[0025] Finally, the rare earth aluminum alloy material is prepared by ultrasonicating the aluminum alloy plate in a hydrochloric acid solution, then polymerizing N-methyl allylamine, the ultraviolet absorption monomer and 1-propylene on the surface of the aluminum alloy plate, and then performing surface treatment again with allyl dimethoxysilane and dimethoxydimethylsilane; the aluminum alloy plate is ultrasonicated in a hydrochloric acid solution, and after the aluminum alloy is soaked in the hydrochloric acid solution, the surface is rich in aluminum ions, which can have a good bonding effect with the pyridine group; N-methyl allylamine, the ultraviolet absorption monomer and 1-propylene are polymerized on the surface of the aluminum alloy plate, and then surface treatment is performed again with allyl dimethoxysilane and dimethoxydimethylsilane; after the polymerization of N-methyl allylamine, the ultraviolet absorption monomer and 1-propylene on the surface of the aluminum alloy plate, the surface of the aluminum alloy plate is rich in secondary amine groups, which can react with the double bonds of allyl dimethoxysilane to introduce siloxane on the surface of the material, providing a site for the formation of polysiloxane; after the surface treatment with allyl dimethoxysilane and dimethoxydimethylsilane, the surface of the aluminum alloy plate contains polysiloxane, the polysiloxane molecules are oriented on the surface of the substrate, forming a dense hydrophobic layer, and the hydrophobic groups are arranged outward to prevent water from wetting and penetrating; this structure makes the water droplets contact the surface in a hemispherical or spherical shape, reduces the adhesion and promotes sliding, and achieves the waterproof effect; at the same time, the siloxane bond in the molecular structure of polysiloxane has a high bond energy and is not easily damaged by the medium, which endows the aluminum alloy with excellent corrosion resistance. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application. Embodiment 1

[0027] A rare earth aluminum alloy material and a preparation method thereof mainly include the following preparation steps.

[0028] (1) uniformly mixing argon, nitrogen and carbon monoxide according to a volume ratio of 1:1:1 to prepare a mixed gas;

[0029] mixing aluminum, iron, magnesium, zinc and silicon dioxide according to a mass ratio of 108:2:1:3:4, melting at 745 ℃ for 18 min, adding lanthanum with a mass of 0.04 times of aluminum and cerium with a mass of 0.04 times of aluminum, stirring at 200 r / min for 40 min, passing the mixed gas, continuing to stir for 40 min, cooling to 695 ℃, pouring, and preparing an aluminum alloy rough plate; standing at 575 ℃ for 11.5 h, cold rolling 7 times, standing at 445 ℃ for 35 min, and preparing an aluminum alloy plate.

[0030] (2) mixing 2-allyl phenol, sodium methoxide and toluene according to a molar ratio of 1:1:20, stirring at 64 ℃ and 200 r / min under nitrogen protection for 55 min, vacuum drying at 50 ℃ for 23 h, and preparing sodium allyl phenol salt; mixing the sodium allyl phenol salt, 2-mercapto-6-nitrobenzothiazole and toluene according to a molar ratio of 1:1:26, stirring at 64 ℃ and 200 r / min under nitrogen protection for 8.5 h, cooling to room temperature, vacuum drying at 75 ℃ for 23 h, and preparing an ultraviolet absorption monomer precursor.

[0031] mixing the ultraviolet absorption monomer precursor, tetrahydrofuran and triethylamine according to a molar ratio of 1:28:1.1, stirring at 200 r / min under nitrogen protection for 18 min, cooling to 1 ℃, adding 4-(2-pyridyl) benzoyl chloride with a molar amount of 1.1 times of the ultraviolet absorption monomer precursor at a uniform speed within 14 min, increasing the temperature to 48 ℃, continuing to stir for 5.5 h, vacuum drying at 70 ℃ for 22 h, washing with deionized water for 8 times, vacuum drying at -5 ℃ for 23 h, and preparing an ultraviolet absorption monomer.

[0032] (3) uniformly mixing potassium persulfate and deionized water according to a mass ratio of 1:10 to prepare an initiator.

[0033] Sodium dodecyl sulfate, deionized water, ultraviolet absorption monomer, N-methyl allylamine, 1-propylene were mixed in a mass ratio of 1:30:9:5:14, stirred at 58℃ and 200r / min for 8min, and then an initiator with the same mass as sodium dodecyl sulfate was added at a uniform speed within 12min, and the stirring was continued for 3h to prepare a surface treatment solution.

[0034] (4) The aluminum alloy plate was immersed in a 2mol / L hydrochloric acid solution for 5min, then ultrasonically treated in deionized water for 8min, and dried at 80℃ for 6h. The surface treatment solution was evenly applied to the surface of the aluminum alloy plate, and dried at 50℃ for 24h. The application and drying were repeated once to prepare a modified aluminum alloy plate.

[0035] Allyl dimethoxysilane and acetone were uniformly mixed in a mass ratio of 1:8 to prepare an allyl dimethoxysilane solution.

[0036] Dimethoxydimethylsilane, acetone and 0.1mol / L hydrochloric acid solution were mixed in a mass ratio of 4:8:1.8 to prepare a siloxane mixture.

[0037] The modified aluminum alloy plate was immersed in the allyl dimethoxysilane solution for 2min, taken out, vacuum dried at 45℃ for 4h, ultrasonically treated in the siloxane mixture for 5min, taken out, vacuum dried at 45℃ for 4h, ultrasonically treated in the siloxane mixture again for 5min, taken out, vacuum dried at 45℃ for 4h, to prepare a rare earth aluminum alloy material. Example 2

[0038] A rare earth aluminum alloy material and a preparation method thereof mainly include the following preparation steps:

[0039] (1) Argon, nitrogen and carbon monoxide were uniformly mixed in a volume ratio of 1:1:1 to prepare a mixed gas;

[0040] Aluminum, iron, magnesium, zinc and silicon dioxide were mixed in a mass ratio of 110:2.5:1.5:3.5:4.5, melted at 750℃ for 20min, and then lanthanum with 0.05 times the mass of aluminum and cerium with 0.05 times the mass of aluminum were added and stirred at 250r / min for 45min. The mixed gas was introduced and the stirring was continued for 45min. The temperature was lowered to 700℃, and the aluminum alloy rough plate was prepared by pouring. The aluminum alloy plate was prepared by standing at 580℃ for 12h, cold rolling 8 times, and standing at 450℃ for 40min.

[0041] (2) 2-allyl phenol, sodium methoxide and toluene were mixed in a molar ratio of 1:1:25, stirred at 65°C, 250 r / min, under nitrogen protection for 60 min, vacuum dried at 55°C for 25 h to prepare sodium allyl phenolate; the sodium allyl phenolate, 2-mercapto-6-nitrobenzothiazole and toluene were mixed in a molar ratio of 1:1:28, stirred at 65°C, 250 r / min, under nitrogen protection for 9 h, cooled to room temperature, vacuum dried at 80°C for 24 h to prepare the ultraviolet absorption monomer precursor.

[0042] The ultraviolet absorption monomer precursor, tetrahydrofuran and triethylamine were mixed in a molar ratio of 1:30:1.2, stirred at 250 r / min, under nitrogen protection for 20 min, cooled to 2°C, 4-(2-pyridyl) benzoyl chloride was added at a uniform speed within 15 min at 1.15 times the molar amount of the ultraviolet absorption monomer precursor, warmed to 50°C, continued to stir for 6 h, vacuum dried at 73°C for 23 h, washed with deionized water for 9 times, vacuum dried at 0°C for 24 h to prepare the ultraviolet absorption monomer.

[0043] (3) The potassium persulfate and deionized water were mixed in a mass ratio of 1:10 to prepare the initiator;

[0044] The sodium dodecyl sulfate, deionized water, ultraviolet absorption monomer, N-methyl allylamine and 1-propylene were mixed in a mass ratio of 1:35:10:6:15, stirred at 60°C, 250 r / min for 10 min, the initiator was added at a uniform speed within 13 min at the same mass of the sodium dodecyl sulfate, continued to stir for 3.5 h to prepare the surface treatment liquid.

[0045] (4) The aluminum alloy plate was immersed in a 2.2 mol / L hydrochloric acid solution for 6 min, then ultrasonically treated in deionized water for 9 min, dried at 85°C for 6.5 h, the surface treatment liquid was evenly applied on the surface of the aluminum alloy plate, dried at 60°C for 25 h, repeated for 1.5 times to prepare the modified aluminum alloy plate.

[0046] The allyl dimethoxysilane and acetone were mixed in a mass ratio of 1:9 to prepare the allyl dimethoxysilane solution.

[0047] The dimethoxydimethylsilane, acetone and 0.1 mol / L hydrochloric acid solution were mixed in a mass ratio of 5:9:2 to prepare the siloxane mixture.

[0048] The modified aluminum alloy plate was immersed in the allyl dimethoxysilane solution for 2.5 min, taken out, vacuum dried at 50°C for 4.5 h, taken out, ultrasonically treated in the siloxane mixture for 6 min, taken out, vacuum dried at 50°C for 4.5 h, ultrasonically treated in the siloxane mixture for 5.5 min again, taken out, vacuum dried at 50°C for 4.5 h to prepare the rare earth aluminum alloy material. Example 3

[0049] A rare earth aluminum alloy material and a preparation method thereof, mainly comprising the following preparation steps:

[0050] (1) uniformly mixing argon, nitrogen and carbon monoxide in a volume ratio of 1:1:1 to obtain a mixed gas;

[0051] mixing aluminum, iron, magnesium, zinc and silicon dioxide in a mass ratio of 112:3:2:4:5, melting at 755℃ for 22 min, adding lanthanum with an aluminum mass of 0.06 times and cerium with an aluminum mass of 0.06 times, stirring at 300 r / min for 50 min, passing the mixed gas, continuing to stir for 50 min, cooling to 705℃, pouring, and obtaining an aluminum alloy rough plate; standing at 585℃ for 12.5 h, cold rolling 9 times, standing at 455℃ for 45 min, and obtaining an aluminum alloy plate.

[0052] (2) mixing 2-allyl phenol, sodium methoxide and toluene in a molar ratio of 1:1:30, stirring at 66℃ and 300 r / min under nitrogen protection for 65 min, vacuum drying at 60℃ for 25 h, and obtaining sodium allyl phenol salt; mixing sodium allyl phenol salt, 2-mercapto-6-nitrobenzothiazole and toluene in a molar ratio of 1:1:30, stirring at 66℃ and 300 r / min under nitrogen protection for 9.5 h, cooling to room temperature, vacuum drying at 85℃ for 25 h, and obtaining an ultraviolet absorption monomer precursor.

[0053] mixing the ultraviolet absorption monomer precursor, tetrahydrofuran and triethylamine in a molar ratio of 1:32:1.3, stirring at 300 r / min under nitrogen protection for 22 min, cooling to 3℃, adding 4-(2-pyridyl) benzoyl chloride with a molar amount of 1.2 times of the ultraviolet absorption monomer precursor at a uniform speed within 16 min, warming to 52℃, continuing to stir for 6.5 h, vacuum drying at 76℃ for 24 h, washing with deionized water for 10 times, vacuum drying at 5℃ for 25 h, and obtaining an ultraviolet absorption monomer.

[0054] (3) uniformly mixing potassium persulfate and deionized water in a mass ratio of 1:10 to obtain an initiator.

[0055] mixing sodium dodecyl sulfate, deionized water, the ultraviolet absorption monomer, N-methyl allylamine, 1-propylene in a mass ratio of 1:40:11:7:16, stirring at 62℃ and 300 r / min for 12 min, adding the initiator with the same mass of sodium dodecyl sulfate at a uniform speed within 14 min, and continuing to stir for 4 h, and obtaining a surface treatment liquid.

[0056] (4) immerging the aluminum alloy plate in 2.4 mol / L hydrochloric acid solution for 7 min, then ultrasonicating in deionized water for 10 min, drying at 90℃ for 7 h, evenly coating the surface treatment solution on the surface of the aluminum alloy plate, drying at 70℃ for 26 h, repeating the coating and drying for 2 times, to obtain the modified aluminum alloy plate.

[0057] Mixing allyl dimethoxysilane and acetone uniformly at a mass ratio of 1:10 to obtain an allyl dimethoxysilane solution.

[0058] Mixing dimethoxydimethylsilane, acetone and 0.1 mol / L hydrochloric acid solution at a mass ratio of 6:10:2.2 to obtain a siloxane mixture.

[0059] Immerging the modified aluminum alloy plate in the allyl dimethoxysilane solution for 3 min, taking out, vacuum drying at 55℃ for 5 h, taking out, ultrasonicating in the siloxane mixture for 6 min, taking out, vacuum drying at 55℃ for 5 h, ultrasonicating in the siloxane mixture for 6 min again, taking out, vacuum drying at 55℃ for 5 h, to obtain the rare earth aluminum alloy material.

[0060] Comparative Example 1

[0061] The preparation method of the rare earth aluminum alloy material of Comparative Example 1 is different from that of Example 2 in that no ultraviolet absorbing monomer is added. The remaining steps are the same as those of Example 2.

[0062] Comparative Example 2

[0063] The preparation method of the rare earth aluminum alloy material of Comparative Example 2 is different from that of Example 2 in that step (4) is different. Step (4) is modified as follows: immerging the aluminum alloy plate in 2.2 mol / L hydrochloric acid solution for 6 min, then ultrasonicating in deionized water for 9 min, drying at 85℃ for 6.5 h, evenly coating the surface treatment solution on the surface of the aluminum alloy plate, drying at 60℃ for 25 h, repeating the coating and drying for 1.5 times, to obtain the rare earth aluminum alloy material. The remaining steps are the same as those of Example 2.

[0064] Comparative Example 3

[0065] The preparation method of the rare earth aluminum alloy material of Comparative Example 3 is different from that of Example 3 in that steps (2), (3) and (4) are not performed, and step (1) is modified as follows: mixing argon, nitrogen and carbon monoxide uniformly at a volume ratio of 1:1:1 to obtain a mixed gas; mixing aluminum, iron, magnesium, zinc and silicon dioxide at a mass ratio of 110:2.5:1.5:3.5:4.5, melting at 750℃ for 20 min, adding lanthanum with an amount of 0.05 times the mass of aluminum and cerium with an amount of 0.05 times the mass of aluminum, stirring at 250 r / min for 45 min, passing the mixed gas, continuing to stir for 45 min, cooling to 700℃, pouring, to obtain the rare earth aluminum alloy material.

[0066] Test Example 1

[0067] Mechanical property test

[0068] The sample was made into a 20 cm x 3 cm x 1 cm sample bar, and the tensile strength was tested. The results are shown in Table 1.

[0069] Table 1 Statistics of tensile strength test results

[0070]

[0071] From the experimental data comparison of Examples 1-3 and Comparative Examples 1-3 in Table 1, it can be found that the rare earth aluminum alloy material prepared by the present application has good mechanical properties.

[0072] From the experimental data comparison of Examples 1, 2, 3 and Comparative Example 3 in Table 1, it can be found that the tensile strength of Examples 1, 2, and 3 is high, and the difference between Comparative Example 3 and the examples is that no annealing treatment is performed, which indicates that annealing treatment can refine the grain, improve or eliminate the residual stress generated during casting, forging, rolling, and welding, remove internal defects, and improve the mechanical properties of the material.

[0073] Test Example 2

[0074] Waterproof and corrosion resistance test

[0075] Waterproof test Test method: test water contact angle;

[0076] Corrosion resistance test Test method: use SCT-194 type salt spray test chamber to perform neutral salt spray test (NSS) on the sample, and the test refers to the standard of GB / T10125-2012 "Artificial atmosphere corrosion test: salt spray test". The samples of each example and comparative example are made into 20 mm x 30 mm x 1 mm, and the sample is placed on a V-shaped frame with the test surface upward at an angle of 30° to the horizontal. The neutral salt spray test of the sample is 72 h, and the test process is continuous spraying of corrosive liquid. After the test, the corrosion of the sample surface is analyzed, and the static contact of water on the sample surface is measured. The results are shown in Table 2.

[0077] Table 2 Statistics of water contact angle test results

[0078]

[0079] From the experimental data comparison of Examples 1-3 and Comparative Examples 1-3 in Table 2, it can be found that the rare earth aluminum alloy material prepared by the present application has good waterproof and corrosion resistance.

[0080] From the experimental data of Example 1, 2, 3 and Comparative Example 2 in Table 2, it can be found that the water contact angle of Example 1, 2, 3 is large, and the difference between Comparative Example 2 and the examples is that polysiloxane is not formed on the surface, which indicates that the polysiloxane molecules are arranged on the surface of the substrate, forming a dense hydrophobic layer, and the hydrophobic groups are arranged outward, preventing water from wetting and penetrating, and this structure makes the water droplets present as a hemisphere or a sphere when they contact the surface, reducing adhesion and promoting sliding, achieving the waterproof effect, and at the same time, the silicon-oxygen bond in the polysiloxane molecular structure has high bond energy and is not easily destroyed by acid and alkali medium, which endows the aluminum alloy with excellent corrosion resistance.

[0081] From the experimental data of Example 1, 2, 3 and Comparative Example 3, it can be found that the water contact angle of Example 1, 2, 3 is large, and the difference between Comparative Example 3 and the examples is that the surface treatment liquid is not applied to the surface, which indicates that the surface treatment liquid also has a certain effect of improving the waterproof and corrosion resistance of the aluminum alloy material.

[0082] Test Example 3

[0083] Durable test:

[0084] The surface treatment of each example and comparative example is transferred to a polytetrafluoroethylene plate, and after film formation, the tensile breaking strength is tested and recorded as M0, the sample is irradiated with a fluorescent ultraviolet lamp UV-A340 for 15 days, and the tensile breaking strength is tested again and recorded as M1, and the retention rate is calculated, wherein the retention rate = M1 / M0 x 100%. The results are shown in Table 3.

[0085] Table 3: Retention rate test result statistics

[0086]

[0087] From the experimental data of Example 1~3 and Comparative Example 1~3 in Table 3, it can be found that the film on the surface of the rare earth aluminum alloy material prepared by the present application has the ability to resist aging.

[0088] From the experimental data of Example 1, 2, 3 and Comparative Example 1 in Table 2, it can be found that the retention rate of Example 1, 2, 3 is large, and the difference between Comparative Example 1 and the examples is that the ultraviolet absorbing monomer is not added, which indicates that the mercaptoester compound with a benzoheterocyclic ring formed by the ultraviolet absorbing monomer can combine with free radicals generated in the oxidation process through the lone pair of electrons on the sulfur atom, forming a stable compound, thereby blocking the propagation of the oxidation chain reaction, and the presence of the sulfur atom reduces the rigidity of the phenylbenzothiazole structure through the lone pair of electrons, increases the relative molecular mass of the compound, and improves its stability, making the material have better aging resistance.

[0089] The above detailed description of the specific embodiments of the present application has been given to understand the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rare earth aluminum alloy material, characterized by, The rare earth aluminum alloy material is prepared by ultrasonicating an aluminum alloy plate in a hydrochloric acid solution, polymerizing N-methylallylamine, an ultraviolet absorption monomer and 1-propylene on the surface of the aluminum alloy plate, and then performing surface treatment again with allyl dimethoxysilane and dimethoxydimethylsilane; The aluminum alloy plate is prepared by mixing aluminum, iron, magnesium, zinc and silicon dioxide, adding lanthanum and cerium, casting forming, and then performing annealing and cold rolling treatment. The ultraviolet absorption monomer is prepared by reacting 2-allylphenol with sodium methoxide, then with 2-mercapto-6-nitrobenzothiazole, and finally with 4-(2-pyridyl)benzoyl chloride.

2. A method of producing a rare earth aluminum alloy material, characterized by, The preparation method of the rare earth aluminum alloy material mainly comprises the following preparation steps: (1) placing at 575-585℃ for 11.5-12.5h, cold rolling 7-9 times, and then placing at 445-455℃ for 35-45min to obtain an aluminum alloy rough plate; (2) mixing the ultraviolet absorption monomer precursor, tetrahydrofuran and triethylamine in a molar ratio of 1:28-32:1.1-1.3, stirring at 200-300r / min under nitrogen protection for 18-22min, cooling to 1-3℃, adding 4-(2-pyridyl)benzoyl chloride at a rate of 1.1-1.2 times the molar amount of the ultraviolet absorption monomer precursor within 14-16min, warming to 48-52℃, and continuing to stir for 5.5-6.5h, vacuum drying at 70-76℃ for 22-24h, washing with deionized water for 8-10 times, and drying to obtain the ultraviolet absorption monomer; (3) mixing sodium dodecyl sulfate, deionized water, the ultraviolet absorption monomer, N-methylallylamine and 1-propylene in a mass ratio of 1:30-40:9-11:5-7:14-16, stirring at 58-62℃ and 200-300r / min for 8-12min, adding an initiator at a rate of the mass of sodium dodecyl sulfate within 12-14min, and continuing to stir for 3-4h to obtain a surface treatment solution; (4) immersing the modified aluminum alloy plate in an allyl dimethoxysilane solution for 2-3min, taking it out, vacuum drying at 45-55℃ for 4-5h, taking it out, ultrasonicating in a siloxane mixture for 5-6min, taking it out, vacuum drying at 45-55℃ for 4-5h, ultrasonicating in the siloxane mixture again for 5-6min, taking it out, and vacuum drying at 45-55℃ for 4-5h to obtain the rare earth aluminum alloy material.

3. The method for preparing a rare earth aluminum alloy material according to claim 2, characterized in that, In step (1), the aluminum alloy rough plate is prepared by mixing aluminum, iron, magnesium, zinc and silicon dioxide in a mass ratio of 108-112:2-3:1-2:3-4:4-5, melting at 745-755℃ for 18-22min, adding lanthanum in an amount of 0.04-0.06 times the mass of aluminum and cerium in an amount of 0.04-0.06 times the mass of aluminum, stirring at 200-300r / min for 40-50min, passing a mixed gas, and continuing to stir for 40-50min to obtain the aluminum alloy rough plate.

4. The method for preparing a rare earth aluminum alloy material according to claim 3, characterized in that, The mixed gas is prepared by mixing argon, nitrogen and carbon monoxide in a volume ratio of 1:1:

1.

5. The method for preparing a rare earth aluminum alloy material according to claim 2, characterized in that, The UV absorbing monomer precursor in step (2) is prepared by mixing 2-allyl phenol, sodium methoxide and toluene in a molar ratio of 1:1:20-30, stirring at 64-66℃, 200-300r / min under nitrogen protection for 55-65min, vacuum drying at 50-60℃ for 23-25h, obtaining sodium allyl phenol salt; mixing sodium allyl phenol salt, 2-mercapto-6-nitrobenzothiazole and toluene in a molar ratio of 1:1:26-30, stirring at 64-66℃, 200-300r / min under nitrogen protection for 8.5-9.5h, cooling to room temperature, vacuum drying at 75-85℃ for 23-25h, obtaining.

6. The method for preparing a rare earth aluminum alloy material according to claim 2, characterized in that, The specific operation of the drying in step (2) is vacuum drying at-5-5℃ for 23-25h.

7. The method for preparing a rare earth aluminum alloy material according to claim 2, characterized in that, The initiator in step (3) is prepared by uniformly mixing potassium persulfate and deionized water in a mass ratio of 1:

10.

8. The method for preparing a rare earth aluminum alloy material according to claim 2, characterized in that, The siloxane mixture in step (4) is prepared by uniformly mixing dimethoxydimethylsilane, acetone and 0.1mol / L hydrochloric acid solution in a mass ratio of 4-6:8-10:1.8-2.

2.

9. The method for preparing a rare earth aluminum alloy material according to claim 2, characterized in that, The allyl dimethoxy silane solution in step (4) is prepared by uniformly mixing allyl dimethoxy silane and acetone in a mass ratio of 1:8-10.

10. The method for preparing a rare earth aluminum alloy material according to claim 2, characterized in that, The modified aluminum alloy plate in step (4) is prepared by immersing the aluminum alloy plate in a 2-2.4mol / L hydrochloric acid solution for 5-7min, then ultrasonicating in deionized water for 8-10min, drying at 80-90℃ for 6-7h, uniformly applying the surface treatment liquid on the surface of the aluminum alloy plate, drying at 50-70℃ for 24-26h, repeating the application and drying 1-2times, obtaining.

Images