High-strength corrosion-resistant aluminum alloy profile and preparation method thereof
By leveraging the synergistic effect of interfacial complexation modifiers and 5-aminosalicylic acid, combined with multi-stage modification treatment, the problem of simultaneously improving the corrosion resistance and mechanical properties of aluminum alloy profiles was solved, achieving a simultaneous improvement in both strength and corrosion resistance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-20
- Publication Date
- 2026-03-27
AI Technical Summary
Existing aluminum alloy profiles struggle to balance corrosion resistance and mechanical properties, and are prone to corrosion failure at grain boundaries. Current modification methods lack sufficient ability to synergistically regulate grain boundary structure, and organic small molecules are rarely used under high-temperature melting and forming conditions, resulting in a lack of effective internal modification schemes.
By employing synergistic interfacial complexation modifiers and 5-aminosalicylic acid, combined with grain refiners, antioxidants, and process stabilizers, a multi-stage modification process is applied to aluminum alloy melts to form a stable grain structure and provide grain boundary protection.
Without significantly increasing the complexity of the manufacturing process, the strength and corrosion resistance of aluminum alloy profiles were improved simultaneously, and the grain growth behavior and grain boundary stability were significantly improved.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of aluminum alloy materials, and particularly relates to a high-strength corrosion-resistant aluminum alloy profile and a preparation method thereof. BACKGROUND
[0002] Aluminum alloy profiles are widely used in the fields of building profiles, transportation, equipment manufacturing and ocean engineering due to their low density, high specific strength and good forming processing performance. With the increasing complexity of the service environment of aluminum alloy profiles, the requirements for their corrosion resistance and structural stability under the conditions of high humidity, high salt mist and corrosive media are increasing.
[0003] In the prior art, the methods for improving the corrosion resistance of aluminum alloy profiles mainly include adjusting alloy composition, adding grain refiners, using surface coatings or performing anodic oxidation treatment. However, the above methods generally have the following disadvantages: on the one hand, simply using alloy element regulation or grain refinement means cannot significantly improve the corrosion resistance while maintaining or improving the overall mechanical properties of the material; on the other hand, surface treatment or coating methods mainly act on the surface layer of the material, and have the problems of insufficient durability, complex process and easy failure during service.
[0004] Existing aluminum alloy modification technologies mainly focus on the simple compounding of inorganic modifiers or traditional additives, and their action modes are mainly limited to single-level grain refinement or melt purification, lacking of synergistic regulation means for the grain boundary structure and corrosion reaction interface of aluminum alloy. Especially in the grain boundary region, the corrosion medium easily occurs primary invasion, leading to intergranular corrosion and performance degradation, and the existing technology still lacks an effective modification scheme that can form a stable protective effect in the grain boundary layer of the material.
[0005] At the same time, although organic small molecules have been applied in the field of corrosion inhibition, their research and application in the internal modification of aluminum alloy profiles, especially in the synergistic effect with aluminum alloy organization under high-temperature melting and forming conditions, are still less, and a mature and industrialized application technology route has not yet been formed.
[0006] Therefore, how to realize the synergistic improvement of the grain structure, grain boundary stability and corrosion resistance of aluminum alloy profiles through internal modification of the material without significantly increasing the process complexity is still a technical problem to be solved in the field. SUMMARY
[0007] In order to overcome the problems of the prior art that the corrosion resistance and mechanical properties of the aluminum alloy profile are difficult to be balanced, the grain boundary is prone to corrosion failure, and the existing modification method has poor synergistic regulation ability on the grain boundary structure, the present application provides a high-strength corrosion-resistant aluminum alloy profile and a preparation method thereof. The present application adopts an internal modification method of synergistic interface complex modification substance and organic small molecule 5-amino salicylic acid, and combines grain refinement aids, antioxidant aids and process stabilizing aids to perform multi-stage modification treatment on the aluminum alloy melt, thereby forming a stable grain structure and grain boundary protection effect in the aluminum alloy. The present application realizes the synchronous improvement of the strength and corrosion resistance of the aluminum alloy profile without significantly increasing the complexity of the preparation process.
[0008] The object of the present application can be achieved by the following technical solutions:
[0009] A high-strength corrosion-resistant aluminum alloy profile, the aluminum alloy profile comprises the following raw materials by weight: aluminum matrix 85-95 parts; synergistic interface complex modification substance 1.0-6.0 parts; 5-amino salicylic acid 0.05-1.5 parts; grain refinement aid 0.1-1.0 parts; antioxidant aid 0.05-0.5 parts; process stabilizing aid 0.01-0.3 parts; wherein the synergistic interface complex modification substance forms a stable synergistic complex network structure in the aluminum matrix through multi-hydroxyl coordination, silicon-oxygen bond connection and metal complexation, for synchronous regulation of the aluminum alloy grain size, grain boundary structure and precipitate distribution; the 5-amino salicylic acid can interact with the synergistic interface complex modification substance in the aluminum alloy grain boundary region to form a stable adsorption layer at the grain boundary, thereby inhibiting the diffusion of corrosion medium to the grain boundary and improving the corrosion resistance of the aluminum alloy profile.
[0010] Optionally, the synergistic interface complex modification substance comprises the following raw materials by weight: tannic acid 0.5-3.0 parts; 3-aminopropyl triethoxysilane 0.5-2.5 parts; iron chloride 0.05-0.8 parts.
[0011] Optionally, the preparation method of the synergistic interface complex modification substance comprises the following steps:
[0012] (1) weigh tannic acid, 3-aminopropyl triethoxysilane and iron chloride, and prepare them separately;
[0013] (2) add tannic acid to a solvent and dissolve and disperse under stirring, then add 3-aminopropyl triethoxysilane and mix under continuous stirring to obtain a mixed system;
[0014] (3) add iron chloride to the mixed system and carry out complexation reaction under stirring, and the synergistic interface complex modification substance is obtained after the reaction is completed.
[0015] Optionally, the reaction condition of step (2) is stirring mixing at 20-40 DEG C, the stirring speed is 200-600 r / min, and the reaction time is 30-120 min.
[0016] Optionally, the reaction condition of step (3) is complexing reaction at 25-60 DEG C, and the reaction time is 20-90 min.
[0017] Optionally, the grain refining agent is mixed by potassium hexafluorotitanate and potassium tetrafluoroborate according to the mass ratio of (1-5):(0.2-1); the antioxidant agent is mixed by potassium chloride and sodium chloride according to the mass ratio of (1-3):(1-2); and the process stabilizing agent is mixed by magnesium chloride and potassium fluoride according to the mass ratio of (1-4):(0.1-1).
[0018] Optionally, a preparation method of the high-strength corrosion-resistant aluminum alloy profile comprises the following steps:
[0019] S1, after drying and impurity removal treatment of an aluminum matrix raw material, the aluminum matrix raw material is added into a smelting device and heated to a molten state to obtain an aluminum melt;
[0020] S2, grain refining agent, antioxidant agent and process stabilizing agent are sequentially added into the aluminum melt, and homogenization treatment is carried out under stirring condition;
[0021] S3, the aluminum melt is added with a synergistic interface complex modification material and 5-aminosalicylic acid, and then modification treatment is carried out under stirring condition, and then forming is carried out to obtain the high-strength corrosion-resistant aluminum alloy profile.
[0022] Optionally, the reaction condition of step S1 is smelting treatment at 680-760 DEG C, and the holding time is 30-120 min.
[0023] Optionally, the reaction condition of step S2 is stirring homogenization treatment at 700-750 DEG C, the stirring speed is 200-600 r / min, and the treatment time is 10-40 min.
[0024] Optionally, the reaction condition of step S3 is modification treatment at 680-740 DEG C, the modification treatment time is 10-60 min, and then an aluminum alloy profile is obtained by extrusion forming.
[0025] The beneficial effects of the present application are:
[0026] This invention constructs a synergistic interface complex modifier by synergistically combining tannic acid, 3-aminopropyltriethoxysilane, and ferric chloride, and further introduces 5-aminosalicylic acid to participate in grain boundary regulation. This enables the internal grain boundary regions of the aluminum alloy to simultaneously possess a multi-hydroxyl-metal complex structure, a silicon-oxygen bond connection structure, and an organic small molecule adsorption structure, thereby forming a stable and continuous internal protection and structural constraint effect at the grain boundary level. This achieves synergistic regulation of grain growth behavior, grain boundary stability, and grain boundary corrosion sensitivity. This internal synergistic modification method is different from existing single alloying or surface treatment methods and has obvious structural level innovation. Attached Figure Description
[0027] The invention will now be further described with reference to the accompanying drawings.
[0028] Figure 1 A comparison of the infrared spectra of interfacial complexes and synergistic interfacial complexes.
[0029] Figure 2 A comparison chart of tensile property and hardness test results for samples with different formulation ratios;
[0030] Figure 3 Comparison of salt spray corrosion test results for samples with different formulation ratios;
[0031] Figure 4 A comparison chart showing the intergranular corrosion test results for samples with different formulations. Detailed Implementation
[0032] The present invention will be further described below with reference to specific embodiments. However, the present invention is not limited to the following embodiments. Equivalent adjustments made without departing from the spirit and essence of the present invention should also be considered to fall within the protection scope of the present invention.
[0033] Example 1:
[0034] This embodiment aims to verify the basic feasibility and stability of this modification route for regulating the microstructure and corrosion resistance of aluminum alloy profiles when the amounts and reaction conditions of the synergistic interface complex modifier, organic small molecules, and various additives are all within the lower limit range.
[0035] S1, Preparation of synergistic interfacial complexation modified materials
[0036] Weigh out 0.5 parts by weight of tannic acid, 0.5 parts by weight of 3-aminopropyltriethoxysilane, and 0.05 parts by weight of ferric chloride; add tannic acid to the solvent and stir at 200 r / min for 30 min at 20℃ to ensure complete dissolution and dispersion; then add 3-aminopropyltriethoxysilane and continue stirring and mixing; finally add ferric chloride and carry out a complexation reaction at 25℃ for 20 min to obtain a synergistic interfacial complex modified material; Figure 1The infrared spectrum comparison shows that the unmodified sample has a wavelength range of 3600–3200 cm⁻¹. -1 The peak at 1320–1210 cm⁻¹ is a significant broad peak, mainly attributed to the stretching vibrations of the phenolic hydroxyl groups O–H in tannic acid and the –NH₂ in 3-aminopropyltriethoxysilane. After modification, this peak broadened further and underwent a slight shift, indicating that the polyhydroxyl structure coordinated with the metal ions. -1 Within the range of 1110–1050 cm⁻¹, the intensity of the C–O related vibrational peaks increased and shifted, indicating that the polyphenol structure participated in the complexation reaction; simultaneously, in the range of 1110–1050 cm⁻¹... -1 At the modified site, the Si–O–Si / Si–O–C correlation peaks were significantly enhanced, reflecting the hydrolysis and condensation of silanes and the formation of the network structure; after modification, the peaks at 700–500 cm⁻¹ were significantly enhanced. -1 The appearance of an enhanced absorption band in the low wavenumber region further proves the formation of the metal-oxygen coordination structure and verifies the successful construction of the synergistic interface complex modified material.
[0037] S2, Preparation of aluminum alloy profiles
[0038] Take 95 parts by weight of aluminum matrix, 1.0 part of synergistic interface complex modifier, 0.05 part of 5-aminosalicylic acid, 0.1 part of grain refiner, 0.05 part of antioxidant, and 0.01 part of process stabilizer; heat the aluminum matrix to 680℃ to melt and hold for 30 min; add the grain refiner, antioxidant, and process stabilizer sequentially, and stir at 200 r / min at 700℃ for 10 min to homogenize; then add the synergistic interface complex modifier and 5-aminosalicylic acid, and modify at 680℃ for 10 min; finally, use extrusion molding to obtain high-strength corrosion-resistant aluminum alloy profiles.
[0039] Example 2:
[0040] This embodiment aims to verify the synergistic effect of the synergistic interface complexation modifier and 5-aminosalicylic acid, as well as the stability of the overall performance of the obtained aluminum alloy profile, when the proportions and reaction conditions of each group are all within the median range.
[0041] S1, Preparation of synergistic interfacial complexation modified materials
[0042] Weigh out 1.5 parts by weight of tannic acid, 1.5 parts by weight of 3-aminopropyltriethoxysilane and 0.4 parts by weight of ferric chloride; add tannic acid to the solvent and stir at 400 r / min for 60 min at 30℃ to fully dissolve and disperse it; then add 3-aminopropyltriethoxysilane and continue mixing under the same conditions; then add ferric chloride and carry out a complexation reaction at 40℃ for 60 min to obtain a synergistic interfacial complex modified material.
[0043] S2, Preparation of aluminum alloy profiles
[0044] Take 90 parts by weight of aluminum matrix, 3.5 parts of synergistic interface complex modifier, 0.8 parts of 5-aminosalicylic acid, 0.55 parts of grain refiner, 0.275 parts of antioxidant, and 0.155 parts of process stabilizer; heat the aluminum matrix to 720℃ to melt and hold for 60 min; add the grain refiner, antioxidant, and process stabilizer sequentially, and stir at 400 r / min at 725℃ for 25 min to homogenize; then add the synergistic interface complex modifier and 5-aminosalicylic acid, and modify at 710℃ for 35 min; finally, use extrusion molding to obtain high-strength corrosion-resistant aluminum alloy profiles.
[0045] Example 3:
[0046] This embodiment aims to verify the enhancement effect of the modified system on the grain boundary stability and corrosion resistance of aluminum alloy profiles when the amount of synergistic interface complex modifier, organic small molecules and various additives and the reaction conditions are all within the upper limit range.
[0047] S1, Preparation of synergistic interfacial complexation modified materials
[0048] Weigh out 3.0 parts by weight of tannic acid, 2.5 parts by weight of 3-aminopropyltriethoxysilane and 0.8 parts by weight of ferric chloride; add tannic acid to the solvent and stir at 600 r / min for 120 min at 40 °C to ensure complete dissolution and dispersion; then add 3-aminopropyltriethoxysilane and continue mixing; then add ferric chloride and carry out a complexation reaction at 60 °C for 90 min to obtain a synergistic interfacial complex modified material;
[0049] S2, Preparation of aluminum alloy profiles
[0050] Take 85 parts by weight of aluminum matrix, 6.0 parts of synergistic interface complex modifier, 1.5 parts of 5-aminosalicylic acid, 1.0 part of grain refiner, 0.5 parts of antioxidant, and 0.3 parts of process stabilizer; heat the aluminum matrix to 760℃ to melt and hold for 120 min; add the grain refiner, antioxidant, and process stabilizer sequentially, and stir at 600 r / min at 750℃ for 40 min to homogenize; then add the synergistic interface complex modifier and 5-aminosalicylic acid, and modify at 740℃ for 60 min; finally, use extrusion molding to obtain high-strength corrosion-resistant aluminum alloy profiles.
[0051] Comparative Example 1:
[0052] This comparative example aims to verify the effect of using only synergistic interfacial complex modifiers for single modification without adding 5-aminosalicylic acid on the overall performance stability of aluminum alloy profiles.
[0053] S1, Preparation of synergistic interfacial complexation modified materials
[0054] Weigh out 1.5 parts by weight of tannic acid, 1.5 parts by weight of 3-aminopropyltriethoxysilane and 0.4 parts by weight of ferric chloride; add tannic acid to the solvent and stir at 400 r / min for 60 min at 30℃ to fully dissolve and disperse it; then add 3-aminopropyltriethoxysilane and continue mixing under the same conditions; then add ferric chloride and carry out a complexation reaction at 40℃ for 60 min to obtain a synergistic interfacial complex modified material.
[0055] S2, Preparation of aluminum alloy profiles
[0056] Take 90.8 parts by weight of aluminum matrix, 3.5 parts of synergistic interface complex modifier, 0.55 parts of grain refiner, 0.275 parts of antioxidant, and 0.155 parts of process stabilizer (excluding 5-aminosalicylic acid, and make up to 0.8 parts with aluminum matrix); heat the aluminum matrix to 720℃ to melt and hold for 60 min; add the grain refiner, antioxidant, and process stabilizer sequentially, and stir at 400 r / min at 725℃ for 25 min to homogenize; then add the synergistic interface complex modifier, and continue stirring and modifying at 710℃ for 35 min; finally, obtain the aluminum alloy profile by extrusion molding.
[0057] Comparative Example 2:
[0058] This comparative example aims to verify the effect of adding only 5-aminosalicylic acid for single modification, without adding synergistic interfacial complexing modifiers, on the overall performance stability of aluminum alloy profiles.
[0059] S1, Preparation of synergistic interfacial complexation modified materials
[0060] In this comparative example, no synergistic interfacial complexation modifier was used, therefore the preparation of this modifier was not carried out.
[0061] S2, Preparation of aluminum alloy profiles
[0062] Take 93.5 parts by weight of aluminum matrix, 0.8 parts of 5-aminosalicylic acid, 0.55 parts of grain refiner, 0.275 parts of antioxidant, and 0.155 parts of process stabilizer (without adding synergistic interfacial complexing modifiers, and making up to 3.5 parts with aluminum matrix); heat the aluminum matrix to 720℃ to melt and hold for 60 min; add the grain refiner, antioxidant, and process stabilizer sequentially, and stir at 400 r / min at 725℃ for 25 min to homogenize; then add 5-aminosalicylic acid, and continue stirring and modifying at 710℃ for 35 min; finally, obtain the aluminum alloy profile by extrusion molding.
[0063] Comparative Example 3:
[0064] This comparative example aims to verify the benchmark performance of the overall stability of aluminum alloy profiles when treated only with grain refiners, antioxidants, and process stabilizers, without introducing synergistic interfacial complex modifiers or adding 5-aminosalicylic acid.
[0065] S1, Preparation of synergistic interfacial complexation modified materials
[0066] In this comparative example, no synergistic interfacial complexation modifier was used, therefore the preparation of this modifier was not carried out.
[0067] S2, Preparation of aluminum alloy profiles
[0068] Take 94.3 parts by weight of aluminum matrix, 0.55 parts of grain refining agent, 0.275 parts of antioxidant agent, and 0.155 parts of process stabilizing agent (excluding synergistic interface complexing modifier and 5-aminosalicylic acid, and make up to 4.3 parts with aluminum matrix); heat the aluminum matrix to 720℃ to melt and hold for 60 min; add the grain refining agent, antioxidant agent, and process stabilizing agent in sequence, and stir at 400 r / min at 725℃ for 25 min to homogenize; then continue stirring at 710℃ for 35 min, and finally obtain aluminum alloy profile by extrusion molding.
[0069] Performance testing:
[0070] 1. Tensile property test method
[0071] The aluminum alloy profiles prepared in Examples 1, 2, and 3, as well as Comparative Examples 1-3, were sampled along the extrusion direction and processed into standard tensile specimens of uniform size. The specimen surfaces were polished to eliminate processing defects. Tensile tests were conducted on an electronic universal testing machine at room temperature, with a constant loading rate set. The yielding behavior, fracture characteristics, and deformation of the specimens during the tensile process were recorded. Multiple parallel tests were performed for each example and comparative example, and the average value was taken. By comparing the differences in tensile properties between different examples and comparative examples, the influence of the synergistic interfacial complex modifier and 5-aminosalicylic acid under different ratios on the overall load-bearing capacity and plastic deformation capacity of the aluminum alloy profiles was evaluated.
[0072] 2. Hardness Testing Method
[0073] Samples of the same specifications were cut from aluminum alloy profiles of Examples 1, 2, 3, and Comparative Examples 1-3, respectively. The samples were cleaned after being inlaid, progressively ground, and polished. Hardness tests were performed on the samples at room temperature using a Vickers hardness tester. Repeated measurements were taken at multiple different locations on the sample surface, and the average value was recorded. This test was used to compare the overall strengthening degree and hardness distribution uniformity of the aluminum alloy microstructure under different modification schemes, and can reflect the influence of synergistic interfacial complex modifiers and small organic molecules on grain refinement and precipitate stability under different addition amounts.
[0074] 3. Salt spray corrosion test method
[0075] The aluminum alloy profiles prepared in Examples 1, 2, and 3, as well as Comparative Examples 1-3, were processed into samples of uniform size. These samples were then sequentially degreased, cleaned, and dried, and their initial state was recorded. The treated samples were then fixed in a salt spray test chamber and subjected to continuous salt spray corrosion tests under set temperature and spray conditions. After the test, the samples were removed, cleaned, and dried. The corrosion morphology, pitting distribution, and overall corrosion degree of the sample surface were observed and recorded. This test was used to simulate service conditions under high salt spray environments, comparing the differences in salt spray corrosion resistance between different examples and comparative examples, thereby evaluating the inhibitory effect of the synergistic interface complex modifier and 5-aminosalicylic acid on corrosion behavior.
[0076] 4. Intergranular corrosion test method
[0077] Aluminum alloy profile samples from Examples 1, 2, and 3, as well as Comparative Examples 1-3, were selected, processed to specified dimensions, and surface-treated. The samples were placed in an intergranular corrosion test solution, kept at a constant temperature for a set time, then removed, cleaned, and dried. Subsequently, cross-sectional samples were prepared, and the corrosion morphology at the grain boundaries was observed using a metallographic microscope to evaluate the continuity and degree of corrosion at the grain boundaries. This test was used to analyze the differences in corrosion sensitivity in the grain boundary region between different examples and comparative examples, thereby verifying the regulatory effect of the synergistic interface complexation modifier and 5-aminosalicylic acid on grain boundary stability under different formulation conditions.
[0078] Table 1. Performance test results of aluminum alloy profiles in the examples and comparative examples.
[0079] Sample No. Tensile strength / MPa Vickers hardness / HV Mass loss after salt spray corrosion / % Intergranular corrosion depth / pm Example 1 415 128 0.82 18 Example 2 452 142 0.45 9 Example 3 430 135 0.63 14 Comparative Example 1 392 121 1.35 28 Comparative Example 2 375 116 1.72 35 Comparative Example 3 348 108 2.10 47
[0080] As shown in Table 1, the high-strength, corrosion-resistant aluminum alloy profiles prepared in Examples 1, 2, and 3 all exhibit significantly better mechanical properties than the comparative examples. Figure 2The tensile strength of Example 1 was 415 MPa and the Vickers hardness was 128 HV, while the tensile strength of Example 3 was 430 MPa and the Vickers hardness was 135 HV. Example 2 achieved the highest values of 452 MPa and 142 HV, respectively. In contrast, the tensile strengths of Comparative Examples 1, 2, and 3 were 392 MPa, 375 MPa, and 348 MPa, respectively, and the Vickers hardnesses were 121 HV, 116 HV, and 108 HV, respectively. These results indicate that the synergistic effect of the interfacial complex modifier and 5-aminosalicylic acid significantly strengthens the microstructure of the aluminum alloy profile, and the strengthening effect is most complete under the median ratio conditions.
[0081] From the corrosion resistance results, Examples 1, 2, and 3 showed significantly lower mass loss rates and intergranular corrosion depths after salt spray corrosion compared to their respective comparative examples. Among them, Figure 3 The mass loss rate after salt spray corrosion of Example 1 was 0.82% and the intergranular corrosion depth was 18 μm. The mass loss rate after salt spray corrosion of Example 3 was 0.63% and the intergranular corrosion depth was 14 μm. In contrast, the mass loss rate after salt spray corrosion of Example 2 was only 0.45% and the intergranular corrosion depth was 9 μm, showing the best corrosion resistance. In comparison, the mass loss rates after salt spray corrosion of Comparative Examples 1, 2, and 3 were 1.35%, 1.72%, and 2.10%, respectively, and the intergranular corrosion depths reached 28 μm, 35 μm, and 47 μm, respectively, with more obvious grain boundary corrosion.
[0082] Further comparison Figure 2 and Figure 4 Examples 1, 2, and 3 show that as the synergistic interfacial complex modifier and 5-aminosalicylic acid are adjusted from the lower limit to the median range, the tensile strength of the aluminum alloy profile increases from 415 MPa to 452 MPa, the Vickers hardness increases from 128 HV to 142 HV, while the mass loss rate after salt spray corrosion decreases from 0.82% to 0.45%, and the intergranular corrosion depth decreases from 18 μm to 9 μm. When the ratio is further increased to the upper limit, although the relevant performance indicators are still better than the comparative example, the improvement rate is slower compared to the median condition, indicating that the median ratio is more conducive to the full realization of the synergistic modification effect.
[0083] In summary, by introducing synergistic interfacial complexing modifiers into the aluminum alloy system and cooperating with 5-aminosalicylic acid, the mechanical properties and corrosion resistance of aluminum alloy profiles can be significantly improved. Among them, the component ratio and reaction conditions corresponding to Example 2 show the best comprehensive performance in terms of tensile strength, hardness, salt spray resistance, and intergranular corrosion resistance, which fully verifies the effectiveness and rationality of the technical solution of the present invention.
Claims
1. A high-strength, corrosion-resistant aluminum alloy profile, characterized in that, The aluminum alloy profile comprises the following raw materials in parts by weight: 85-95 parts aluminum matrix; 1.0-6.0 parts synergistic interface complexing modifier; 0.05-1.5 parts 5-aminosalicylic acid; 0.1-1.0 parts grain refining agent; 0.05-0.5 parts antioxidant; and 0.01-0.3 parts process stabilizing agent. The synergistic interface complex modifier forms a stable synergistic complex network structure in the aluminum matrix through multi-hydroxyl coordination, silicon-oxygen bond connection, and metal complexation, which is used to simultaneously regulate the grain size, grain boundary structure, and precipitate distribution of the aluminum alloy. The 5-aminosalicylic acid can interact with the synergistic interface complex modifier in the grain boundary region of the aluminum alloy, forming a stable adsorption layer at the grain boundary, thereby inhibiting the diffusion of corrosive media to the grain boundary and improving the corrosion resistance of the aluminum alloy profile.
2. The high-strength corrosion-resistant aluminum alloy profile according to claim 1, characterized in that, The synergistic interface complexing modifier comprises the following raw materials in parts by weight: 0.5-3.0 parts of tannic acid; 0.5-2.5 parts of 3-aminopropyltriethoxysilane; and 0.05-0.8 parts of ferric chloride.
3. The high-strength corrosion-resistant aluminum alloy profile according to claim 1, characterized in that, The preparation method of the synergistic interface complex modified material includes the following steps: (1) Weigh out tannic acid, 3-aminopropyltriethoxysilane and ferric chloride, and set aside for later use; (2) Add tannic acid to the solvent and dissolve and disperse it under stirring. Then add 3-aminopropyltriethoxysilane and mix and react under continuous stirring to obtain a mixed system. (3) Add ferric chloride to the mixed system and carry out a complexation reaction under stirring conditions. After the reaction is completed, a synergistic interfacial complexation modified material is obtained.
4. The high-strength corrosion-resistant aluminum alloy profile according to claim 3, characterized in that, The reaction conditions for step (2) are: stirring and mixing at 20-40°C, stirring speed of 200-600 r / min, and reaction time of 30-120 min.
5. A high-strength corrosion-resistant aluminum alloy profile according to claim 3, characterized in that, The reaction conditions for step (3) are complexation reaction at 25-60°C for 20-90 min.
6. The high-strength corrosion-resistant aluminum alloy profile according to claim 1, characterized in that, The grain refining agent is a mixture of potassium hexafluorotitanate and potassium tetrafluoroborate in a mass ratio of (1-5):(0.2-1); the antioxidant is a mixture of potassium chloride and sodium chloride in a mass ratio of (1-3):(1-2); and the process stabilizing agent is a mixture of magnesium chloride and potassium fluoride in a mass ratio of (1-4):(0.1-1).
7. A method for preparing a high-strength, corrosion-resistant aluminum alloy profile, characterized in that, The preparation method includes the following steps: S1, After drying and removing impurities from the aluminum matrix raw material, it is added to the smelting equipment and heated to a molten state to obtain aluminum melt; S2, Grain refiner, antioxidant and process stabilizer are added to the aluminum melt in sequence and homogenized under stirring conditions; S3, a synergistic interfacial complexing modifier and 5-aminosalicylic acid are added to the aluminum melt, and after modification under stirring conditions, it is shaped to obtain a high-strength corrosion-resistant aluminum alloy profile.
8. The method for preparing a high-strength corrosion-resistant aluminum alloy profile according to claim 7, characterized in that, The reaction conditions for step S1 are melting at 680–760°C and holding for 30–120 minutes.
9. The method for preparing a high-strength corrosion-resistant aluminum alloy profile according to claim 7, characterized in that, The reaction conditions for step S2 are as follows: stirring and homogenizing at 700–750°C, stirring speed of 200–600 r / min, and processing time of 10–40 min.
10. The method for preparing a high-strength corrosion-resistant aluminum alloy profile according to claim 7, characterized in that, The reaction conditions for step S3 are as follows: modification treatment is carried out at 680-740℃ for 10-60 minutes, followed by extrusion molding to obtain aluminum alloy profiles.