CN117900397A - Preparation method of anti-corrosion high-corrosion-resistance aluminum alloy layered composite material - Google Patents
Preparation method of anti-corrosion high-corrosion-resistance aluminum alloy layered composite material Download PDFInfo
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 216
- 239000002131 composite material Substances 0.000 title claims abstract description 94
- 238000005260 corrosion Methods 0.000 title claims abstract description 84
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 79
- 238000005096 rolling process Methods 0.000 claims abstract description 73
- 238000000137 annealing Methods 0.000 claims abstract description 46
- 238000005253 cladding Methods 0.000 claims abstract description 42
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 24
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- 238000003723 Smelting Methods 0.000 claims abstract description 16
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- 238000000034 method Methods 0.000 claims description 19
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- 238000002844 melting Methods 0.000 abstract description 4
- 239000011162 core material Substances 0.000 description 58
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- VRAIHTAYLFXSJJ-UHFFFAOYSA-N alumane Chemical compound [AlH3].[AlH3] VRAIHTAYLFXSJJ-UHFFFAOYSA-N 0.000 description 8
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- 229910052737 gold Inorganic materials 0.000 description 4
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Abstract
The invention discloses a preparation method of an anti-corrosion high-corrosion aluminum alloy layered composite material, which comprises the following steps: smelting, standing, degassing and filtering according to the mass percentage of the core aluminum alloy, preheating the cladding aluminum alloy to 210-290 ℃, and combining the cladding aluminum alloy on the surface of the molten core aluminum alloy plate strip in a continuous casting mode in a triangular area formed by a casting nozzle and a casting roller so as to combine the cladding aluminum alloy and the molten core aluminum alloy plate strip in a solid-liquid two-phase interval to obtain an aluminum alloy layered composite material blank; carrying out diffusion annealing on the aluminum alloy laminar composite blank, and then carrying out cold rough rolling, intermediate annealing, cold finish rolling and finished product annealing; wherein, the mass percentage components of the core aluminum alloy comprise Mn:0.5 to 2.0 percent, cu:0.3 to 0.8 percent, si: less than or equal to 0.5 percent, fe: less than or equal to 0.2 percent, and the balance of aluminum; the casting temperature of the core aluminum alloy is 650-665 ℃, and the liquid phase proportion is 65-80%. The invention can improve the anti-melting and anti-corrosion performance of the material.
Description
Technical Field
The invention relates to a preparation method of an aluminum alloy layered composite material, and belongs to the technical field of layered alloy preparation.
Background
The rolling compounding process is the most widely applied solid ⁃ solid compounding method, and the brazing aluminum plate strips for heat exchange such as water cooling plates, radiators and the like are mainly produced by adopting the rolling compounding process at present, and the bimetal composite plates stacked together by spot welding are rolled under a large rolling reduction, so that the bimetal materials are subjected to plastic deformation, the oxide skin on the surfaces of the base layer and the coating layer is damaged, and therefore, atomic bonding is generated on the bonding surface of the base layer and the coating layer.
The rolling composite process is simple and mature, the preparation cost is low, but the thickness structural parameters are difficult to control accurately, and particularly, high-density products are difficult to synthesize. The process of spot welding and then rolling compounding is easy to form defects at the interface, and the high internal stress at the interface is easy to be caused by different expansion coefficients between materials. In the subsequent production rolling process, the profile of the aluminum plate is significantly affected and changed with the release of the non-uniform internal stress, thereby causing a bad plate shape. The formed interface belongs to a solid-solid combined interface, and needs to rely on plastic deformation in the later annealing and rolling process to generate atomic bonding, so that the interface density is insufficient, and elements are difficult to diffuse due to layer-by-layer separation on the structure.
These problems result in a high braze temperature and high internal stress at the interface driving both element diffusion and material recrystallization behavior during the final braze anneal, with simultaneous melting of the skin, element diffusion and recrystallization occurring along with the braze process, and interactions. Thus, the biggest problem with composite brazed aluminum sheet strip products is the severe braze corrosion. Meanwhile, the corrosion resistance of the material is further reduced due to the diffusion of Si and Cu elements caused by corrosion, inter-crystal corrosion is generated, and the problems of failure of a radiator and a condenser through hole are easily caused.
In the prior art, casting and rolling are applied to the preparation of composite brazing aluminum plate strips, aluminum-aluminum composite is realized on an aluminum casting and rolling machine, and thin strip cold rolling is directly carried out from a casting and rolling coil, so that two metals of aluminum-aluminum alloy are metallurgically bonded. Although the internal stress of the product can be reduced, uneven structures with fine surfaces and extremely coarse inside are easy to appear in cast-rolling structures, and the defects of strong crystallization orientation, serious component segregation, supersaturation of elements and the like also exist, so that a path is provided for corrosion in the brazing process, more corrosion micro cells are formed, and later corrosion and erosion of the composite brazing aluminum plate strip foil are easier to cause.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a preparation method of an anti-corrosion high-corrosion-resistance aluminum alloy layered composite material, and aims to solve the problems of corrosion and erosion in the later stage of composite brazing aluminum plate strip foil.
The technical scheme of the invention is as follows: a preparation method of an anti-corrosion high-corrosion aluminum alloy layered composite material comprises the following steps:
Smelting, standing, degassing and filtering according to the mass percentage of the core aluminum alloy, preheating the cladding aluminum alloy to 210-290 ℃, and combining the cladding aluminum alloy on the surface of the molten core aluminum alloy plate strip in a continuous casting mode in a triangular area formed by a casting nozzle and a casting roller so that the cladding aluminum alloy and the molten core aluminum alloy plate strip are combined in a solid-liquid two-phase area to obtain an aluminum alloy layered composite material blank; performing diffusion annealing on the aluminum alloy layered composite material blank, and performing cold rough rolling, intermediate annealing, cold finish rolling and finished product annealing to obtain the anti-corrosion high-corrosion aluminum alloy layered composite material;
Wherein, the mass percentage components of the core aluminum alloy comprise Mn:0.5 to 2.0 percent, cu:0.3 to 0.8 percent, si: less than or equal to 0.5 percent, fe: less than or equal to 0.2 percent, and the balance of aluminum; the casting temperature of the core aluminum alloy is 650-665 ℃, and the liquid phase proportion is 65% -80%;
Further, the temperature at the outlet of the casting roller is 450-550 ℃, and the temperature at the joint of the cladding aluminum alloy and the molten core aluminum alloy plate strip is 350-450 ℃.
Further, the smelting temperature of the core aluminum alloy is 690-760 ℃, the standing temperature is 680-750 ℃, and the degassing temperature is 670-745 ℃.
Further, the clad aluminum alloy is an aluminum alloy with the designations 4045, 4343, 7072, or 3003 or a modified alloy of an aluminum alloy with the designations 4045, 4343, 7072, or 3003.
Further, the cladding aluminum alloy is located on at least one of the upper surface and the lower surface of the molten core aluminum alloy plate strip, and at least one layer of the cladding aluminum alloy is arranged on one surface of the molten core aluminum alloy plate strip.
Further, the billet moving speed of the cladding aluminum alloy and the molten core aluminum alloy plate strip when being combined in a solid-liquid two-phase interval is 0.7-1.6 m/min.
Further, the thickness of the core material aluminum alloy in the aluminum alloy layered composite material blank accounts for 70-85%.
Further, the diffusion annealing is carried out by placing the aluminum alloy layered composite material blank in nitrogen atmosphere, the temperature is 420-460 ℃, and the temperature is kept for 5-15 h.
Further, the intermediate annealing is to heat the cold rough rolled material to 250-330 ℃ and keep the temperature for 6-16 h.
Further, the thickness of the aluminum alloy layered composite material blank is 5-10 mm, and the thickness of the corrosion-resistant high-corrosion-resistant aluminum alloy layered composite material obtained after annealing of the finished product is 0.1-2.0 mm.
According to the invention, the cladding layer aluminum alloy is integrally preheated in the casting and rolling process, the casting temperature of the core material aluminum alloy is reduced by about 100 ℃ compared with the traditional casting and rolling temperature, the temperature difference between the cladding layer aluminum alloy and high-temperature aluminum liquid is reduced, the generation of a solidified layer is reduced, a large amount of solidified layers are prevented from remelting under the action of the high-temperature aluminum liquid, and then severe energy transmission and molecular diffusion occur in the process, the temperature gradient and the concentration gradient are reduced, and the internal uniformity of a casting and rolling structure is improved.
In the preparation process, the casting temperature of the core material aluminum alloy is controlled to control proper liquid phase proportion, when the casting temperature is lower, the solid content of the aluminum liquid is high, solidification can occur at a casting nozzle, the service life of the casting nozzle is damaged, and defects such as uneven deformation of a rolling area and the like are generated; when the casting temperature is high, the aluminum liquid is completely in a liquid state, and the defects of the traditional casting and rolling can be generated.
The cladding aluminum alloy and the molten core aluminum alloy plate strip are combined in a solid-liquid two-phase interval, so that the problem of uneven cooling strength caused by the difference of crystallization conditions of aluminum liquid in the casting and rolling process is effectively avoided, the aluminum alloy layered composite material has a uniform microstructure, and the defects of crystallization orientation, component segregation, element supersaturation and the like are reduced. The interaction between element diffusion and cladding melting in the brazing process of the finished product is avoided, so that the corrosion resistance and corrosion resistance of the aluminum alloy composite material are improved.
In addition, when the cladding aluminum alloy and the molten core aluminum alloy plate strip are combined in a solid-liquid two-phase interval, the billet moving speed is controlled to further control the casting and rolling quality, and when the billet moving speed is higher, the phenomenon of molten aluminum leakage can be generated; when the billet moving speed is low, the casting and rolling contact time is long, and the surface of the aluminum strip is over-burned and foamed.
Compared with the prior art, the invention has the advantages that:
The invention improves the production efficiency, reduces the cost, forms the metallurgical bond between aluminum alloys, avoids the internal stress and the volume stress generated during rolling and compounding after spot welding, obviously reduces the internal stress, improves the plate shape of the aluminum alloy layered composite material and improves the bonding strength between different layers. The metallurgical bonding formed greatly reduces the interaction of cladding melting, element diffusion and recrystallization in the brazing process, reduces the corrosion, improves the corrosion resistance of the material, and prolongs the service life of the radiator and the condenser. The SAG property of the anti-corrosion high-corrosion-resistance aluminum alloy layered composite material obtained by the invention is less than or equal to 20mm, and the SWAAT seawater corrosion is carried out for 50 days without perforation. Compared with rolling after welding, the invention also reduces the process steps of casting, spot welding and the like, greatly saves the production cost, simplifies the production flow and improves the production efficiency.
Drawings
FIG. 1 is a schematic diagram of a casting-rolling composite process of a clad aluminum alloy and a core aluminum alloy.
FIG. 2 is a diagram of the gold phase of the corrosion-resistant and high corrosion-resistant aluminum alloy layered composite material prepared in example 1 before brazing.
FIG. 3 is a diagram of the gold phase of the corrosion-resistant and high corrosion-resistant aluminum alloy layered composite material of example 1 after brazing.
Detailed Description
The invention is further illustrated, but is not limited, by the following examples.
Example 1
The preparation method of the anti-corrosion high-corrosion aluminum alloy layered composite material comprises the following steps:
(1) Preparing a formula of a core material aluminum alloy 1, wherein the core material aluminum alloy 1 comprises the following components in percentage by mass: 1.0%, cu:0.5%, si:0.3%, fe: less than or equal to 0.1 percent, the balance being aluminum, heating and smelting the raw materials, standing, degassing and filtering, wherein the smelting temperature is 720 ℃, the standing temperature is 710 ℃ and the degassing temperature is 705 ℃.
(2) The cladding aluminum alloy 2 is selected from aluminum alloys with the marks of 4045 and 7072, and the whole double-sided preheating is carried out on the cladding aluminum alloy 2 plate strip, wherein the preheating temperature is 250 ℃.
(3) As shown in fig. 1, the clad aluminum alloy 2 is continuously cast onto the core aluminum alloy 1 in a molten state by a low-temperature casting process in a triangular region formed by a nozzle-casting roll 3, and two different brands of clad aluminum alloys 2 are located on the upper and lower sides of the core aluminum alloy 1. Precisely controlling casting and rolling technological parameters, controlling casting temperature to 655-660 ℃, and calculating by using JMapro software to obtain the liquid phase proportion of the core material aluminum alloy 1 at 65% -80%, so that the molten core material aluminum alloy 1 and the clad aluminum alloy 2 plate strip are combined in a solid-liquid two-phase interval, and obtaining the aluminum alloy layered composite material blank with a three-layer structure. The billet moving speed in the casting and rolling process is 1.2 m/min, the temperature at the outlet of the casting roller 3 is 520 ℃, the temperature at the interface joint of the aluminum-aluminum composite belt is controlled to be about 425 ℃, and the interface casting and rolling composite effect is good. The thickness of the obtained casting-rolling blank of the aluminum alloy layered composite material is 7.5mm, and the core aluminum alloy accounts for 80% of the total thickness.
(4) Performing diffusion annealing on the cast aluminum alloy layered composite material blank; diffusion annealing was performed under nitrogen atmosphere at 440℃for 10 hours.
(5) And (3) slitting the aluminum alloy layered composite material after cold rough rolling, intermediate annealing, cold finish rolling and finished product annealing to obtain aluminum alloy plates and strips with different widths, wherein the intermediate annealing temperature is 290 ℃, the heat preservation time is 12 hours, and the thickness of the finished product after cold finish rolling is 0.4mm.
The gold phase diagram of the finished product of the corrosion-resistant high-corrosion-resistant aluminum alloy layered composite material obtained by the embodiment is shown in fig. 2, and the gold phase diagram of the finished product after brazing is shown in fig. 3. Sag=18 mm for the corrosion resistant high corrosion resistant aluminum alloy layered composite, swaat seawater corrosion for 50 days without perforation.
Example 2
The preparation method of the anti-corrosion high-corrosion aluminum alloy layered composite material comprises the following steps:
(1) Preparing a core aluminum alloy formula, wherein the core aluminum alloy comprises the following components in percentage by mass: 1.5%, cu:0.6%, si:0.5%, fe: less than or equal to 0.1 percent, the balance being aluminum, heating and smelting the raw materials, standing, degassing and filtering, wherein the smelting temperature is 695 ℃, the standing temperature is 685 ℃ and the degassing temperature is 675 ℃.
(2) The cladding aluminum alloy is selected from 4343 aluminum alloy, and the whole double-sided preheating is carried out on the cladding aluminum alloy plate strip, wherein the preheating temperature is 220 ℃.
(3) And continuously casting the cladding alloy onto the molten core aluminum alloy in a triangular area formed by the casting nozzle and the casting roller through a low-temperature casting process, wherein the cladding aluminum alloy is positioned on the upper surface of the core aluminum alloy. The casting and rolling technological parameters are precisely controlled, the casting temperature is controlled to be 650-655 ℃, the liquid phase proportion of the core aluminum alloy is 65% -80% at the moment by calculation of the JMaplo software, and the molten core aluminum alloy and the coated aluminum alloy plate are combined in a solid-liquid two-phase interval to obtain the aluminum alloy layered composite material blank with a two-layer structure. The billet moving speed in the casting and rolling process is 1.5 m/min, the temperature at the outlet of the casting roller is 465 ℃, the temperature at the interface joint of the aluminum-aluminum composite belt is controlled to be about 370 ℃, and the interface casting and rolling composite effect is good. The thickness of the obtained casting-rolling blank of the aluminum alloy layered composite material is 9mm, and the core aluminum alloy accounts for 85% of the total thickness.
(4) Performing diffusion annealing on the cast aluminum alloy layered composite material blank; diffusion annealing was performed under nitrogen atmosphere at 420℃for 15 hours.
(5) And (3) slitting the aluminum alloy layered composite material after cold rough rolling, intermediate annealing, cold finish rolling and finished product annealing to obtain aluminum alloy plates and strips with different widths, wherein the intermediate annealing temperature is 250 ℃, the heat preservation time is 16 hours, and the thickness of the finished product after cold finish rolling is 1.0mm.
Sag=17 mm of the corrosion-resistant high-corrosion-resistant aluminum alloy layered composite material obtained in this example, and swaat seawater corrosion was not perforated for 50 days.
Example 3
The preparation method of the anti-corrosion high-corrosion aluminum alloy layered composite material comprises the following steps:
(1) Preparing a core aluminum alloy formula, wherein the core aluminum alloy comprises the following components in percentage by mass: 0.7%, cu:0.6%, si:0.1%, fe:0.14 percent of aluminum and the balance of aluminum, heating and smelting all raw materials, standing, degassing and filtering, wherein the smelting temperature is 760 ℃, the standing temperature is 750 ℃, and the degassing temperature is 745 ℃.
(2) The cladding aluminum alloy is selected from aluminum alloys with grades 4343 and 7072 and aluminum alloy with a grade 3003 added with Zn, wherein the mass percentage of Zn is 1.2+/-0.1, and the whole double-sided preheating is carried out on the cladding aluminum alloy plate strip, and the preheating temperature is 285 ℃.
(3) And continuously casting the cladding alloy onto the molten core aluminum alloy through a low-temperature casting process in a triangular area formed by the casting nozzle and the casting roller, wherein the upper surface of the core aluminum alloy is sequentially provided with aluminum alloy with the brand 3003 and aluminum alloy with the brand 4343, which are added with Zn, and the lower surface of the core aluminum alloy is provided with aluminum alloy with the brand 7072. The casting and rolling technological parameters are precisely controlled, the casting temperature is controlled to 657-665 ℃, the liquid phase proportion of the core aluminum alloy is 65% -80% at the moment by calculation of the JMaplo software, and the molten core aluminum alloy and the coated aluminum alloy plate are combined in a solid-liquid two-phase interval, so that the aluminum alloy layered composite material blank with a two-layer structure is obtained. The billet moving speed in the casting and rolling process is 0.8 m/min, the temperature at the outlet of the casting and rolling roller is 530 ℃, the temperature at the interface joint of the aluminum-aluminum composite belt is controlled to be about 420 ℃, and the interface casting and rolling composite effect is good. The thickness of the obtained casting-rolling blank of the aluminum alloy layered composite material is 6mm, and the core aluminum alloy accounts for 75% of the total thickness.
(4) Performing diffusion annealing on the cast aluminum alloy layered composite material blank; diffusion annealing was performed under nitrogen atmosphere at 460℃for 5 hours.
(5) And (3) slitting the aluminum alloy layered composite material after cold rough rolling, intermediate annealing, cold finish rolling and finished product annealing to obtain aluminum alloy plates and strips with different widths, wherein the intermediate annealing temperature is 330 ℃, the heat preservation time is 6 hours, and the thickness of the finished product after cold finish rolling is 0.27mm.
Sag=20mm of the corrosion-resistant high-corrosion-resistant aluminum alloy layered composite material obtained in this example, and swaat seawater corrosion was not perforated for 50 days.
Example 4
The preparation method of the anti-corrosion high-corrosion aluminum alloy layered composite material comprises the following steps:
(1) Preparing a core aluminum alloy formula, wherein the core aluminum alloy comprises the following components in percentage by mass: 2.0%, cu:0.8%, si:0.5%, fe: less than or equal to 0.1 percent, the balance being aluminum, heating and smelting the raw materials, standing, degassing and filtering, wherein the smelting temperature is 690 ℃, the standing temperature is 680 ℃, and the degassing temperature is 670 ℃.
(2) The cladding aluminum alloy is selected from 4343 aluminum alloy, and the whole double-sided preheating is carried out on the cladding aluminum alloy plate strip, wherein the preheating temperature is 210 ℃.
(3) And continuously casting the cladding alloy onto the molten core aluminum alloy in a triangular area formed by the casting nozzle and the casting roller through a low-temperature casting process, wherein the cladding aluminum alloy is positioned on the upper surface of the core aluminum alloy. The casting and rolling technological parameters are precisely controlled, the casting temperature is controlled to be 650-658 ℃, the liquid phase proportion of the core aluminum alloy is 65-80% at the moment by calculation of the JMaplo software, and the molten core aluminum alloy and the coated aluminum alloy plate are combined in a solid-liquid two-phase interval to obtain the aluminum alloy layered composite material blank with a two-layer structure. The billet moving speed in the casting and rolling process is 1.6 m/min, the temperature at the outlet of the casting and rolling roller is 520 ℃, the temperature at the interface joint of the aluminum-aluminum composite belt is controlled to be about 420 ℃, and the interface casting and rolling composite effect is good. The thickness of the obtained casting-rolling blank of the aluminum alloy layered composite material is 9mm, and the core aluminum alloy accounts for 85% of the total thickness.
(4) Performing diffusion annealing on the cast aluminum alloy layered composite material blank; diffusion annealing was performed under nitrogen atmosphere at 450℃for 8 hours.
(5) And (3) slitting the aluminum alloy layered composite material after cold rough rolling, intermediate annealing, cold finish rolling and finished product annealing to obtain aluminum alloy plates and strips with different widths, wherein the intermediate annealing temperature is 310 ℃, the heat preservation time is 10 hours, and the thickness of the finished product after cold finish rolling is 1.8mm.
Sag=19 mm of the corrosion-resistant high-corrosion-resistant aluminum alloy layered composite material obtained in this example, and swaat seawater corrosion was not perforated for 50 days.
Example 5
The preparation method of the anti-corrosion high-corrosion aluminum alloy layered composite material comprises the following steps:
(1) Preparing a core aluminum alloy formula, wherein the core aluminum alloy comprises the following components in percentage by mass: 0.5%, cu:0.3%, si:0.3%, fe: less than or equal to 0.1 percent, the balance being aluminum, heating and smelting the raw materials, standing, degassing and filtering, wherein the smelting temperature is 760 ℃, the standing temperature is 750 ℃ and the degassing temperature is 745 ℃.
(2) The cladding aluminum alloy is selected from 4343 aluminum alloy, and the whole double-sided preheating is carried out on the cladding aluminum alloy plate strip, wherein the preheating temperature is 250 ℃.
(3) And continuously casting the cladding alloy onto the molten core aluminum alloy in a triangular area formed by the casting nozzle and the casting roller through a low-temperature casting process, wherein the cladding aluminum alloy is positioned on the upper surface of the core aluminum alloy. Precisely controlling casting and rolling technological parameters, controlling casting temperature to 655-663 ℃, calculating by using JMapro software to obtain the liquid phase proportion of the core material aluminum alloy at 65% -80%, and combining the molten core material aluminum alloy and the cladding aluminum alloy plate strip in a solid-liquid two-phase interval to obtain the aluminum alloy layered composite material blank with a two-layer structure. The billet moving speed in the casting and rolling process is 1.0 m/min, the temperature at the outlet of the casting roller is 500 ℃, the temperature at the interface joint of the aluminum-aluminum composite belt is controlled to be about 370 ℃, and the interface casting and rolling composite effect is good. The thickness of the obtained casting-rolling blank of the aluminum alloy layered composite material is 1.2mm, and the core aluminum alloy accounts for 85% of the total thickness.
(4) Performing diffusion annealing on the cast aluminum alloy layered composite material blank; diffusion annealing was performed under nitrogen atmosphere at 440℃for 10 hours.
(5) And (3) slitting the aluminum alloy layered composite material after cold rough rolling, intermediate annealing, cold finish rolling and finished product annealing to obtain aluminum alloy plates and strips with different widths, wherein the intermediate annealing temperature is 280 ℃, the heat preservation time is 13 hours, and the thickness of the finished product after cold finish rolling is 0.2mm.
Sag=20mm of the corrosion-resistant high-corrosion-resistant aluminum alloy layered composite material obtained in this example, and swaat seawater corrosion was not perforated for 50 days.
Comparative example
The preparation method of the anti-corrosion high-corrosion aluminum alloy layered composite material comprises the following steps:
(1) Preparing a core aluminum alloy formula, wherein the core aluminum alloy comprises the following components in percentage by mass: 1.0%, cu:0.5%, si:0.3%, fe: less than or equal to 0.1 percent, the balance being aluminum, heating and smelting the raw materials, standing, degassing and filtering, wherein the smelting temperature is 720 ℃, the standing temperature is 710 ℃ and the degassing temperature is 705 ℃.
(2) The cladding aluminum alloy is selected from aluminum alloys with the grades of 4045 and 7072, and the whole double-sided preheating is carried out on the cladding aluminum alloy plate strip, wherein the preheating temperature is 100 ℃.
(3) And continuously casting cladding alloy onto the molten core material aluminum alloy in a triangular area formed by the casting nozzle and the casting roller, wherein two cladding aluminum alloys with different brands are positioned on the upper surface and the lower surface of the core material aluminum alloy. Precisely controlling casting and rolling technological parameters, controlling casting temperature to 680-690 ℃, and obtaining the aluminum alloy layered composite material blank with a three-layer structure, wherein the liquid phase proportion of the core material aluminum alloy is 100% by calculation of the JMaplo software. The billet moving speed in the casting and rolling process is 0.9 m/min, the temperature at the outlet of the casting and rolling roller is 530 ℃, the temperature at the interface joint of the aluminum-aluminum composite strip is about 470 ℃, the thickness of the obtained aluminum alloy laminar composite material casting and rolling billet is 7.5mm, and the core aluminum alloy accounts for 80% of the total thickness.
(4) Performing diffusion annealing on the cast aluminum alloy layered composite material blank; diffusion annealing was performed under nitrogen atmosphere at 460℃for 10 hours.
(5) And (3) slitting the aluminum alloy layered composite material after cold rough rolling, intermediate annealing, cold finish rolling and finished product annealing to obtain aluminum alloy plates and strips with different widths, wherein the intermediate annealing temperature is 255 ℃, the heat preservation time is 15 hours, and the thickness of the finished product after cold finish rolling is 0.4mm.
SAGs = 26 mm, swaat seawater corrosion for 45 days perforations for the aluminum alloy layered composite obtained in this comparative example.
The performance tests in the above examples and comparative examples are illustrated below:
The SAG performance test method is as follows: the test specimens were prepared parallel to the rolling direction and had a specimen width of 22 mm, were fixed on a sagging resistance test apparatus and the difference between the free ends of the test specimens before and after the brazing environment was measured. The length from the fixed center of the sample to the free end is 50 mm, the muffle furnace is heated to 605 ℃, the test device is stably placed in the furnace, and after 5min, the test device is moved out of the furnace for air cooling to measure the sagging distance of the free end. The SWAAT seawater test standard is ASTM/G85-1998 modified salt spray test method.
Claims (10)
1. The preparation method of the anti-corrosion high-corrosion aluminum alloy layered composite material is characterized by comprising the following steps: smelting, standing, degassing and filtering according to the mass percentage of the core aluminum alloy, preheating the cladding aluminum alloy to 210-290 ℃, and combining the cladding aluminum alloy on the surface of the molten core aluminum alloy plate strip in a continuous casting mode in a triangular area formed by a casting nozzle and a casting roller so that the cladding aluminum alloy and the molten core aluminum alloy plate strip are combined in a solid-liquid two-phase area to obtain an aluminum alloy layered composite material blank; performing diffusion annealing on the aluminum alloy layered composite material blank, and performing cold rough rolling, intermediate annealing, cold finish rolling and finished product annealing to obtain the anti-corrosion high-corrosion aluminum alloy layered composite material;
Wherein, the mass percentage components of the core aluminum alloy comprise Mn:0.5 to 2.0 percent, cu:0.3 to 0.8 percent, si: less than or equal to 0.5 percent, fe: less than or equal to 0.2 percent, and the balance of aluminum; the casting temperature of the core aluminum alloy is 650-665 ℃, and the liquid phase proportion is 65-80%.
2. The method for producing a corrosion-resistant and high corrosion-resistant aluminum alloy layered composite material according to claim 1, wherein the temperature at the exit of the casting roll is 450 to 550 ℃, and the temperature at the junction of the clad aluminum alloy and the molten core aluminum alloy sheet strip is 350 to 450 ℃.
3. The method for producing a corrosion-resistant and high corrosion-resistant aluminum alloy layered composite material according to claim 1, wherein the core aluminum alloy is melted at 690 to 760 ℃, allowed to stand at 680 to 750 ℃ and degassed at 670 to 745 ℃.
4. The method of producing a corrosion-resistant and high corrosion-resistant aluminum alloy layered composite material according to claim 1, wherein the clad aluminum alloy is an aluminum alloy having a designation of 4045, 4343, 7072 or 3003 or a modified alloy of an aluminum alloy having a designation of 4045, 4343, 7072 or 3003.
5. The method for producing a corrosion-resistant and high corrosion-resistant aluminum alloy layered composite material according to claim 1, wherein the clad aluminum alloy is located on at least one of the upper and lower surfaces of the molten core aluminum alloy sheet strip.
6. The method for preparing the corrosion-resistant and high-corrosion-resistant aluminum alloy layered composite material according to claim 1, wherein the billet moving speed of the cladding aluminum alloy and the molten core aluminum alloy plate strip in the combination of a solid phase and a liquid phase is 0.7-1.6 m/min.
7. The method for preparing the corrosion-resistant and high-corrosion-resistant aluminum alloy layered composite material according to claim 1, wherein the thickness ratio of the core aluminum alloy in the aluminum alloy layered composite material blank is 70% -85%.
8. The method for preparing the corrosion-resistant and high-corrosion-resistant aluminum alloy layered composite material according to claim 1, wherein the diffusion annealing is carried out by placing the aluminum alloy layered composite material blank in a nitrogen atmosphere at 420-460 ℃ and preserving heat for 5-15 h.
9. The method for preparing the corrosion-resistant and high-corrosion-resistant aluminum alloy layered composite material according to claim 1, wherein the intermediate annealing is to heat the cold rough rolled material to 250-330 ℃ and keep the temperature for 6-16 h.
10. The method for preparing the corrosion-resistant and high-corrosion-resistant aluminum alloy layered composite material according to claim 1, wherein the thickness of the aluminum alloy layered composite material blank is 5-10 mm, and the thickness of the corrosion-resistant and high-corrosion-resistant aluminum alloy layered composite material obtained after annealing of the finished product is 0.1-2.0 mm.
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