CN114029214B - Automobile roof aluminum alloy shell and machining process thereof - Google Patents
Automobile roof aluminum alloy shell and machining process thereof Download PDFInfo
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- CN114029214B CN114029214B CN202210011010.XA CN202210011010A CN114029214B CN 114029214 B CN114029214 B CN 114029214B CN 202210011010 A CN202210011010 A CN 202210011010A CN 114029214 B CN114029214 B CN 114029214B
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Abstract
The invention discloses an automobile roof aluminum alloy shell and a processing technology thereof, when graphene oxide covers the surface of an alloy, the high conductivity of the graphene oxide is easy to cause galvanic corrosion, and the corrosion of metal is accelerated; the conventional solution is to disperse graphene oxide into an organic coating and then coat the organic coating on the surface of the alloy so as to avoid the problem of galvanic corrosion, but the practical operation finds that the problem of galvanic corrosion cannot be completely avoided by only depending on the organic coating, so that the application discloses an automobile roof aluminum alloy shell and a processing technology thereof, and the specific structure is aluminum alloy matrix-transition layer-middle layer-corrosion-resistant coating; the prepared aluminum alloy shell has excellent corrosion resistance and lasting corrosion resistance, and when the corrosion-resistant coating on the outer surface is damaged, the aluminum alloy shell still can keep certain corrosion resistance, can effectively guarantee the corrosion resistance of the automobile shell, and has higher practicability.
Description
Technical Field
The invention relates to the technical field of aluminum alloy shells, in particular to an automobile roof aluminum alloy shell and a processing technology thereof.
Background
The aluminum and the aluminum alloy not only have the advantages of easy processing and forming, small density, high corrosion resistance, low thermal expansion coefficient, high specific strength, outstanding strain performance and the like, but also have wide application fields, are extremely useful in food packaging, structural members, energy sources and traffic, and are non-ferrous metal materials which are second to iron in use amount in the metal industry.
At present, because the volume of the automobile roof is larger in automobile body parts, in order to reduce the weight of the whole automobile, the aluminum alloy is used for replacing a conventional steel plate as a shell material so as to reduce oil consumption, and meanwhile, in order to improve the corrosion resistance of the aluminum alloy of the automobile roof, the aluminum alloy surface corrosion resistance treatment is carried out on the aluminum alloy.
The research on the corrosion resistance treatment of the surface of the aluminum alloy is relatively deep, and the graphene oxide serving as a common corrosion-resistant material is widely applied to the corrosion resistance direction of the aluminum alloy, but the further research finds that when the graphene oxide covers the surface of the alloy, the high conductivity of the graphene oxide is easy to cause galvanic corrosion, and the corrosion of metal is accelerated; the conventional solution is generally to disperse graphene oxide into an organic coating, but the operation is still prone to galvanic corrosion, which affects the practical application of the aluminum alloy.
Aiming at the problem, the automobile roof aluminum alloy shell and the processing technology thereof are disclosed to solve the problem.
Disclosure of Invention
The invention aims to provide an aluminum alloy shell of an automobile roof and a processing technology thereof, which aim to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme:
an automobile roof aluminum alloy shell comprises an aluminum alloy matrix, wherein a transition layer, an intermediate layer and an anti-corrosion coating are sequentially arranged on the surface of the aluminum alloy matrix;
the transition layer is an electrodeposited silicon dioxide layer; the intermediate layer is composed of two layers of modified silica stacked.
According to an optimized scheme, the corrosion-resistant coating comprises the following raw materials: by weight, 4-6 parts of modified graphene oxide, 15-25 parts of water-based epoxy resin, 10-15 parts of azide epoxy resin, 3-5 parts of curing agent, 2-3 parts of defoaming agent, 2-2.5 parts of dispersing agent, 1-2 parts of film-forming assistant and 1-2 parts of flatting agent.
According to an optimized scheme, the modified graphene oxide is mainly prepared by reacting graphene oxide, dimethylacetamide and polyurethane azide.
In an optimized scheme, the modified silicon dioxide is magnetic silicon dioxide.
According to an optimized scheme, the modified silicon dioxide is mainly prepared by reacting iron oxyhydroxide, absolute ethyl alcohol and tetraethoxysilane.
According to an optimized scheme, the processing technology of the automobile top cover aluminum alloy shell comprises the following steps:
(1) taking an aluminum alloy matrix, polishing the surface of the aluminum alloy matrix, putting the aluminum alloy matrix into an acetone solution, carrying out ultrasonic cleaning, putting the aluminum alloy matrix into an ethanol solution, continuously cleaning, washing with deionized water, and carrying out vacuum drying for later use;
(2) taking absolute ethyl alcohol and sodium nitrate, mixing and stirring, adding ethyl orthosilicate, adjusting pH, continuously stirring under a sealed condition, and then stirring in a water bath at 25-28 ℃ for 4-6 hours to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer;
(3) taking iron oxyhydroxide, absolute ethyl alcohol and deionized water, uniformly mixing, adding ammonia water, stirring and dispersing, adding tetraethoxysilane, continuously stirring, sequentially washing by the absolute ethyl alcohol and the deionized water, and drying in vacuum to obtain modified silicon dioxide;
taking modified silicon dioxide and isopropanol, and performing ultrasonic dispersion to obtain a solution B;
placing the aluminum alloy substrate treated in the step (2) in a toluene solution of 3-aminopropyltrimethoxysilane, soaking, washing the toluene, sequentially cleaning the washed toluene by absolute ethyl alcohol and deionized water, then soaking the washed toluene in a hydrochloric acid solution, washing the washed deionized water, placing the washed deionized water in a solution B, and soaking for 1-2 hours to form a first layer of modified silicon dioxide;
(4) repeating the step (3), and stacking a second layer of modified silicon dioxide on the surface of the aluminum alloy substrate to form an intermediate layer;
(5) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C;
taking graphene oxide and dimethylacetamide, mixing uniformly, performing ultrasonic oscillation, adding the solution C, continuously stirring, placing under an oil bath at 160 ℃ of 150-;
mixing and stirring uniformly modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent to prepare the corrosion-resistant coating;
and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
The optimized scheme comprises the following steps:
(1) taking an aluminum alloy substrate, polishing the surface of the aluminum alloy substrate, putting the aluminum alloy substrate into an acetone solution, ultrasonically cleaning for 10-15min, then putting the aluminum alloy substrate into an ethanol solution, continuously cleaning for 10-20min, washing with deionized water, and drying in vacuum for later use;
(2) mixing anhydrous ethanol and sodium nitrate, adding ethyl orthosilicate, adjusting pH to 3, continuously stirring for 10-20min under a sealed condition, and stirring for 4-6h in a water bath at 25-28 ℃ to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer;
(3) taking iron oxyhydroxide, absolute ethyl alcohol and deionized water, uniformly mixing, adding ammonia water, stirring and dispersing for 20-25min, adding tetraethoxysilane, continuously stirring for 8-10h, sequentially washing by the absolute ethyl alcohol and the deionized water, and drying in vacuum to obtain modified silicon dioxide;
taking modified silicon dioxide and isopropanol, and performing ultrasonic dispersion for 30-40min to obtain a solution B;
placing the aluminum alloy substrate treated in the step (2) in a toluene solution of 3-aminopropyltrimethoxysilane, soaking for 30-40min, washing the toluene, sequentially cleaning with absolute ethyl alcohol and deionized water, then placing in a hydrochloric acid solution, soaking for 8-10min, washing with deionized water, placing in a solution B, and soaking for 1-2h to form a first layer of modified silicon dioxide; the particle size of the modified silicon dioxide is 40 nm;
(4) repeating the step (3), stacking a second layer of modified silicon dioxide on the surface of the aluminum alloy substrate, wherein the particle size of the modified silicon dioxide is 20nm, and forming an intermediate layer;
(5) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C;
taking graphene oxide and dimethylacetamide, uniformly mixing, carrying out ultrasonic oscillation for 1-2h, adding the solution C, continuously stirring for 10-20min, placing under an oil bath at the temperature of 150-;
mixing and stirring modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent for 20-30min to prepare the corrosion-resistant coating; and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
In the optimized scheme, in the step (3), when the solution B is immersed, the aluminum alloy matrix is positioned in a magnetic field, and the magnetic field intensity is 12-14 KA/m.
According to the optimized scheme, when two layers of modified silicon dioxide are stacked, the adopted magnetic field intensity is the same, and the magnetic field directions are opposite.
In the optimized scheme, in the step (2), the voltage during electrodeposition is 3-5V, and the deposition time is 800-.
Compared with the prior art, the invention has the following beneficial effects:
graphene oxide is a two-dimensional nano material, has good mechanical properties, a high length-diameter ratio and excellent barrier properties, and is therefore widely applied to the corrosion resistance direction of alloys, but with further research, when graphene oxide covers the surface of an alloy, the high conductivity of graphene oxide is very easy to cause galvanic corrosion, and rather, the corrosion of metals is accelerated; the conventional solution is to disperse graphene oxide into an organic coating and then coat the organic coating on the surface of the alloy so as to avoid the problem of galvanic corrosion, but the practical operation finds that the problem of galvanic corrosion cannot be completely avoided by only depending on the organic coating, so that the application discloses an automobile roof aluminum alloy shell and a processing technology thereof, and the specific structure is aluminum alloy matrix-transition layer-middle layer-corrosion-resistant coating; the transition layer is the silica layer of electro-deposition in this scheme, and silica is insulating material, and the setting of transition layer can effectively block the electricity connection between oxidation graphite alkene and the aluminum alloy base member, the avoiding galvanic corrosion problem that can very big degree.
Because the transition layer is silicon dioxide prepared by electrodeposition, gaps still exist among silicon dioxide particles, and after the organic coating is damaged, a corrosive medium can enter from the gaps and contact the aluminum alloy matrix, so that the aluminum alloy matrix is subjected to corrosion reaction, and in order to avoid the problem, the corrosion resistance of the aluminum alloy is further improved; meanwhile, the particles in the middle layer are also selected to be silicon dioxide, and the graphene oxide and the aluminum alloy are further isolated through the insulating property of the silicon dioxide, so that the galvanic corrosion problem is further avoided.
When the intermediate layer is prepared, because the particles of conventional silicon dioxide are unevenly arranged, gaps still exist when the silicon dioxide is stacked on the surface of the transition layer, so that the coating density and the corrosion-resistant effect of the alloy surface are influenced, aiming at the problem, the application selects to improve the silicon dioxide, the magnetic silicon dioxide is prepared, the intermediate layer is prepared in a magnetic field environment for operation, and the whole process is as follows: after the preparation of the transition layer is finished, selecting modified silica particles with the particle size of 40nm, stacking the modified silica particles on the transition layer, placing the particles in a magnetic field during stacking, wherein the magnetic field intensity is 12-14KA/m, and carrying out orientation arrangement on the modified silica particles under the magnetic field to form a first layer of modified silica; the modified silica particles with the particle size of 20nm are selected and stacked on the surface of the first layer of modified silica to form a second layer of modified silica, the magnetic field intensity is the same in the process, but the magnetic fields with opposite magnetic field directions are stacked, the middle layer is formed by stacking the modified silica layers with opposite orientations, the particle size of the upper layer of modified silica is obviously smaller than that of the lower layer of modified silica, and therefore the modified silica corrosion-resistant coating can effectively avoid a large number of gaps among the silica particles, the corrosion-resistant effect is guaranteed, the moving path of a corrosive medium can be greatly prolonged, and the corrosion-resistant effect is improved.
After the intermediate layer is prepared, the surface of the intermediate layer is coated with the corrosion-resistant coating containing the graphene oxide, and the graphene oxide is easy to agglomerate, so that in order to avoid the problem, the modified graphene oxide is prepared by coating the modified graphene oxide with polyurethane azide, and due to the existence of the polyurethane azide, the dispersibility of the modified graphene oxide is improved, the compatibility of the modified graphene oxide with epoxy resin is also greatly improved, and the problem that the graphene oxide is easy to agglomerate is avoided; meanwhile, when the corrosion-resistant coating is prepared, the azide epoxy resin is added, and the azide epoxy resin and the epoxy resin have a mutual synergistic effect, so that the adhesive force of the corrosion-resistant coating can be effectively improved, and the corrosion resistance of the whole aluminum alloy is ensured.
The application discloses vapour car roof aluminum alloy casing and processing technology thereof, process design is reasonable, easy operation, and the aluminum alloy casing that obtains of preparation has excellent corrosion resisting property, and corrosion resistance is lasting, and when the corrosion-resistant coating of surface appears damaged, this aluminum alloy casing still can keep certain corrosion resisting property, can effectively guarantee vapour car casing's corrosion resisting property, has higher practicality.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the scheme, the aluminum alloy substrate for all the embodiments is 6005 aluminum alloy.
Example 1:
a processing technology of an automobile roof aluminum alloy shell comprises the following steps:
(1) taking an aluminum alloy substrate, polishing the surface of the aluminum alloy substrate, putting the aluminum alloy substrate into an acetone solution, ultrasonically cleaning for 10min, then putting the aluminum alloy substrate into an ethanol solution, continuously cleaning for 10min, washing with deionized water, and drying in vacuum for later use;
(2) taking absolute ethyl alcohol and sodium nitrate, mixing and stirring, adding ethyl orthosilicate, adjusting the pH to 3, continuously stirring for 10min under a sealed condition, and then stirring for 6h in a water bath at 25 ℃ to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer; wherein the voltage during the electrodeposition is 3V, and the deposition time is 1000 s;
(3) taking iron oxyhydroxide, absolute ethyl alcohol and deionized water, uniformly mixing, adding ammonia water, stirring and dispersing for 20min, adding tetraethoxysilane, continuously stirring for 8h, sequentially washing by the absolute ethyl alcohol and the deionized water, and drying in vacuum to obtain modified silicon dioxide;
taking modified silicon dioxide and isopropanol, and performing ultrasonic dispersion for 30min to obtain a solution B;
placing the aluminum alloy substrate treated in the step (2) in a toluene solution of 3-aminopropyltrimethoxysilane, soaking for 30min, washing the toluene, sequentially cleaning with absolute ethyl alcohol and deionized water, soaking in a hydrochloric acid solution for 8min, washing with deionized water, placing in a solution B, and soaking for 1h to form a first layer of modified silicon dioxide, wherein the particle size of the modified silicon dioxide is 40 nm;
(4) repeating the step (3), stacking a second layer of modified silicon dioxide on the surface of the aluminum alloy substrate, wherein the particle size of the modified silicon dioxide is 20nm, and forming an intermediate layer;
(5) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C;
taking graphene oxide and dimethylacetamide, mixing uniformly, carrying out ultrasonic oscillation for 1h, adding the solution C, continuing stirring for 10min, placing under an oil bath at 150 ℃, stirring for reaction for 3h, carrying out suction filtration washing, and carrying out vacuum drying to obtain modified graphene oxide;
mixing and stirring modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent for 20min to prepare the corrosion-resistant coating; and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
In the step (3) of this embodiment, when the solution B is immersed, the aluminum alloy substrate is located in a magnetic field, and the magnetic field strength is 12 KA/m; when two layers of modified silicon dioxide in the middle layer are stacked, the adopted magnetic field intensity is the same, and the magnetic field directions are opposite.
The corrosion-resistant coating comprises the following raw materials: by weight, 4 parts of modified graphene oxide, 15 parts of water-based epoxy resin, 10 parts of azide epoxy resin, 3 parts of curing agent, 2 parts of defoaming agent, 2 parts of dispersing agent, 1 part of film-forming assistant and 1 part of flatting agent.
Example 2:
a processing technology of an automobile roof aluminum alloy shell comprises the following steps:
(1) taking an aluminum alloy substrate, polishing the surface of the aluminum alloy substrate, placing the aluminum alloy substrate in an acetone solution, ultrasonically cleaning for 12min, then placing the aluminum alloy substrate in an ethanol solution, continuously cleaning for 15min, washing with deionized water, and drying in vacuum for later use;
(2) taking absolute ethyl alcohol and sodium nitrate, mixing and stirring, adding ethyl orthosilicate, adjusting the pH to 3, continuously stirring for 15min under a sealed condition, and then stirring for 5h in a water bath at 26 ℃ to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer; wherein the voltage during the electrodeposition is 4V, and the deposition time is 900 s;
(3) taking iron oxyhydroxide, absolute ethyl alcohol and deionized water, uniformly mixing, adding ammonia water, stirring and dispersing for 24min, adding tetraethoxysilane, continuously stirring for 9h, sequentially washing by the absolute ethyl alcohol and the deionized water, and drying in vacuum to obtain modified silicon dioxide;
taking modified silicon dioxide and isopropanol, and performing ultrasonic dispersion for 35min to obtain a solution B;
placing the aluminum alloy substrate treated in the step (2) in a toluene solution of 3-aminopropyltrimethoxysilane, soaking for 35min, washing the toluene, sequentially cleaning with absolute ethyl alcohol and deionized water, soaking in a hydrochloric acid solution for 9min, washing with deionized water, placing in a solution B, and soaking for 1.5h to form a first layer of modified silicon dioxide, wherein the particle size of the modified silicon dioxide is 40 nm;
(4) repeating the step (3), stacking a second layer of modified silicon dioxide on the surface of the aluminum alloy substrate, wherein the particle size of the modified silicon dioxide is 20nm, and forming an intermediate layer;
(5) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C;
taking graphene oxide and dimethylacetamide, uniformly mixing, carrying out ultrasonic oscillation for 1.5h, adding the solution C, continuously stirring for 15min, placing under an oil bath at 155 ℃, stirring for reaction for 2.5h, carrying out suction filtration washing, and carrying out vacuum drying to obtain modified graphene oxide;
mixing and stirring modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent for 25min to prepare the corrosion-resistant coating; and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
In the step (3) of this embodiment, when the solution B is immersed, the aluminum alloy substrate is located in a magnetic field, and the magnetic field strength is 13 KA/m; when two layers of modified silicon dioxide in the middle layer are stacked, the adopted magnetic field intensity is the same, and the magnetic field directions are opposite.
The corrosion-resistant coating comprises the following raw materials: by weight, 5 parts of modified graphene oxide, 20 parts of water-based epoxy resin, 12 parts of azide epoxy resin, 4 parts of curing agent, 2.5 parts of defoaming agent, 2.4 parts of dispersing agent, 1.5 parts of film-forming assistant and 1.5 parts of flatting agent.
Example 3:
a processing technology of an automobile roof aluminum alloy shell comprises the following steps:
(1) taking an aluminum alloy substrate, polishing the surface of the aluminum alloy substrate, putting the aluminum alloy substrate into an acetone solution, ultrasonically cleaning for 15min, then putting the aluminum alloy substrate into an ethanol solution, continuously cleaning for 20min, washing with deionized water, and drying in vacuum for later use;
(2) mixing and stirring absolute ethyl alcohol and sodium nitrate, adding ethyl orthosilicate, adjusting the pH to 3, continuously stirring for 20min under a sealed condition, and then stirring for 4h in a water bath at 28 ℃ to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer; wherein the voltage during the electrodeposition is 5V, and the deposition time is 800 s;
(3) taking iron oxyhydroxide, absolute ethyl alcohol and deionized water, uniformly mixing, adding ammonia water, stirring and dispersing for 25min, adding tetraethoxysilane, continuously stirring for 10h, sequentially washing by the absolute ethyl alcohol and the deionized water, and drying in vacuum to obtain modified silicon dioxide;
taking modified silicon dioxide and isopropanol, and performing ultrasonic dispersion for 40min to obtain a solution B;
placing the aluminum alloy substrate treated in the step (2) in a toluene solution of 3-aminopropyltrimethoxysilane, soaking for 40min, washing the toluene, sequentially cleaning with absolute ethyl alcohol and deionized water, then placing in a hydrochloric acid solution for soaking for 10min, washing with deionized water, placing in a solution B, and soaking for 2h to form a first layer of modified silicon dioxide, wherein the particle size of the modified silicon dioxide is 40 nm;
(4) repeating the step (3), stacking a second layer of modified silicon dioxide on the surface of the aluminum alloy substrate, wherein the particle size of the modified silicon dioxide is 20nm, and forming an intermediate layer;
(5) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C;
taking graphene oxide and dimethylacetamide, uniformly mixing, carrying out ultrasonic oscillation for 2h, adding the solution C, continuously stirring for 20min, placing under an oil bath at 160 ℃, stirring for reaction for 2h, carrying out suction filtration washing, and carrying out vacuum drying to obtain modified graphene oxide;
mixing and stirring modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent for 30min to prepare the corrosion-resistant coating; and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
In the step (3) of this embodiment, when the solution B is immersed, the aluminum alloy substrate is located in a magnetic field, and the magnetic field strength is 14 KA/m; when two layers of modified silicon dioxide in the middle layer are stacked, the adopted magnetic field intensity is the same, and the magnetic field directions are opposite.
The corrosion-resistant coating comprises the following raw materials: by weight, 6 parts of modified graphene oxide, 25 parts of water-based epoxy resin, 15 parts of azide epoxy resin, 5 parts of curing agent, 3 parts of defoaming agent, 2.5 parts of dispersing agent, 2 parts of film-forming assistant and 2 parts of flatting agent.
Comparative example 1: comparative example 1 a parameter change was made on the basis of example 2, in comparative example 1 no intermediate layer was prepared, and the remaining process steps and parameters were in accordance with example 2.
A processing technology of an automobile roof aluminum alloy shell comprises the following steps:
(1) taking an aluminum alloy substrate, polishing the surface of the aluminum alloy substrate, placing the aluminum alloy substrate in an acetone solution, ultrasonically cleaning for 12min, then placing the aluminum alloy substrate in an ethanol solution, continuously cleaning for 15min, washing with deionized water, and drying in vacuum for later use;
(2) taking absolute ethyl alcohol and sodium nitrate, mixing and stirring, adding ethyl orthosilicate, adjusting the pH to 3, continuously stirring for 15min under a sealed condition, and then stirring for 5h in a water bath at 26 ℃ to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer; wherein the voltage during the electrodeposition is 4V, and the deposition time is 900 s;
(3) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C;
taking graphene oxide and dimethylacetamide, uniformly mixing, carrying out ultrasonic oscillation for 1.5h, adding the solution C, continuously stirring for 15min, placing under an oil bath at 155 ℃, stirring for reaction for 2.5h, carrying out suction filtration washing, and carrying out vacuum drying to obtain modified graphene oxide;
mixing and stirring modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent for 25min to prepare the corrosion-resistant coating; and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
The corrosion-resistant coating comprises the following raw materials: by weight, 5 parts of modified graphene oxide, 20 parts of water-based epoxy resin, 12 parts of azide epoxy resin, 4 parts of curing agent, 2.5 parts of defoaming agent, 2.4 parts of dispersing agent, 1.5 parts of film-forming assistant and 1.5 parts of flatting agent.
Comparative example 2: comparative example 2 the parameters were changed based on example 2, and in comparative example 2, the magnetic field direction was not defined and the particle size of the modified silica was not defined when the two layers of modified silica were stacked, and the remaining process steps and parameters were the same as those of example 2.
A processing technology of an automobile roof aluminum alloy shell comprises the following steps:
(1) taking an aluminum alloy substrate, polishing the surface of the aluminum alloy substrate, placing the aluminum alloy substrate in an acetone solution, ultrasonically cleaning for 12min, then placing the aluminum alloy substrate in an ethanol solution, continuously cleaning for 15min, washing with deionized water, and drying in vacuum for later use;
(2) taking absolute ethyl alcohol and sodium nitrate, mixing and stirring, adding ethyl orthosilicate, adjusting the pH to 3, continuously stirring for 15min under a sealed condition, and then stirring for 5h in a water bath at 26 ℃ to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer; wherein the voltage during the electrodeposition is 4V, and the deposition time is 900 s;
(3) taking iron oxyhydroxide, absolute ethyl alcohol and deionized water, uniformly mixing, adding ammonia water, stirring and dispersing for 24min, adding tetraethoxysilane, continuously stirring for 9h, sequentially washing by the absolute ethyl alcohol and the deionized water, and drying in vacuum to obtain modified silicon dioxide;
taking modified silicon dioxide and isopropanol, and performing ultrasonic dispersion for 35min to obtain a solution B;
placing the aluminum alloy substrate treated in the step (2) in a toluene solution of 3-aminopropyltrimethoxysilane, soaking for 35min, washing the toluene, sequentially cleaning with absolute ethyl alcohol and deionized water, then placing in a hydrochloric acid solution for soaking for 9min, washing with deionized water, placing in a solution B, and soaking for 1.5h to form a first layer of modified silicon dioxide;
(4) repeating the step (3), and stacking a second layer of modified silicon dioxide on the surface of the aluminum alloy substrate to form an intermediate layer;
(5) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C;
taking graphene oxide and dimethylacetamide, uniformly mixing, carrying out ultrasonic oscillation for 1.5h, adding the solution C, continuously stirring for 15min, placing under an oil bath at 155 ℃, stirring for reaction for 2.5h, carrying out suction filtration washing, and carrying out vacuum drying to obtain modified graphene oxide;
mixing and stirring modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent for 25min to prepare the corrosion-resistant coating; and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
In the step (3) of this example, the aluminum alloy substrate is located in a magnetic field when the solution B is immersed, and the magnetic field intensity is 13 KA/m.
The corrosion-resistant coating comprises the following raw materials: by weight, 5 parts of modified graphene oxide, 20 parts of water-based epoxy resin, 12 parts of azide epoxy resin, 4 parts of curing agent, 2.5 parts of defoaming agent, 2.4 parts of dispersing agent, 1.5 parts of film-forming assistant and 1.5 parts of flatting agent.
Comparative example 3: comparative example 3 the parameters were changed based on example 2, and in comparative example 3, the conventional silica was selected for surface stacking, and the stacking was not performed in a magnetic field environment, and the remaining process steps and parameters were the same as those of example 2.
A processing technology of an automobile roof aluminum alloy shell comprises the following steps:
(1) taking an aluminum alloy substrate, polishing the surface of the aluminum alloy substrate, placing the aluminum alloy substrate in an acetone solution, ultrasonically cleaning for 12min, then placing the aluminum alloy substrate in an ethanol solution, continuously cleaning for 15min, washing with deionized water, and drying in vacuum for later use;
(2) taking absolute ethyl alcohol and sodium nitrate, mixing and stirring, adding ethyl orthosilicate, adjusting the pH to 3, continuously stirring for 15min under a sealed condition, and then stirring for 5h in a water bath at 26 ℃ to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer; wherein the voltage during the electrodeposition is 4V, and the deposition time is 900 s;
(3) taking silicon dioxide and isopropanol, and ultrasonically dispersing for 35min to obtain a solution B;
placing the aluminum alloy substrate treated in the step (2) in a toluene solution of 3-aminopropyltrimethoxysilane, soaking for 35min, washing the toluene, sequentially cleaning with absolute ethyl alcohol and deionized water, then placing in a hydrochloric acid solution for soaking for 9min, washing with deionized water, placing in a solution B, and soaking for 1.5h to form a first layer of silicon dioxide, wherein the particle size of the silicon dioxide is 40 nm;
(4) repeating the step (3), stacking a second layer of silicon dioxide on the surface of the aluminum alloy substrate, wherein the particle size of the silicon dioxide is 20nm, and forming an intermediate layer;
(5) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C;
taking graphene oxide and dimethylacetamide, uniformly mixing, carrying out ultrasonic oscillation for 1.5h, adding the solution C, continuously stirring for 15min, placing under an oil bath at 155 ℃, stirring for reaction for 2.5h, carrying out suction filtration washing, and carrying out vacuum drying to obtain modified graphene oxide;
mixing and stirring modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent for 25min to prepare the corrosion-resistant coating; and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
The corrosion-resistant coating comprises the following raw materials: by weight, 5 parts of modified graphene oxide, 20 parts of water-based epoxy resin, 12 parts of azide epoxy resin, 4 parts of curing agent, 2.5 parts of defoaming agent, 2.4 parts of dispersing agent, 1.5 parts of film-forming assistant and 1.5 parts of flatting agent.
Comparative example 4: comparative example 4, parameters are changed on the basis of example 2, conventional graphene oxide is selected in the corrosion-resistant coating in comparative example 3, and the rest process steps and parameters are consistent with those of example 2.
A processing technology of an automobile roof aluminum alloy shell comprises the following steps:
(1) taking an aluminum alloy substrate, polishing the surface of the aluminum alloy substrate, placing the aluminum alloy substrate in an acetone solution, ultrasonically cleaning for 12min, then placing the aluminum alloy substrate in an ethanol solution, continuously cleaning for 15min, washing with deionized water, and drying in vacuum for later use;
(2) taking absolute ethyl alcohol and sodium nitrate, mixing and stirring, adding ethyl orthosilicate, adjusting the pH to 3, continuously stirring for 15min under a sealed condition, and then stirring for 5h in a water bath at 26 ℃ to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer; wherein the voltage during the electrodeposition is 4V, and the deposition time is 900 s;
(3) taking iron oxyhydroxide, absolute ethyl alcohol and deionized water, uniformly mixing, adding ammonia water, stirring and dispersing for 24min, adding tetraethoxysilane, continuously stirring for 9h, sequentially washing by the absolute ethyl alcohol and the deionized water, and drying in vacuum to obtain modified silicon dioxide;
taking modified silicon dioxide and isopropanol, and performing ultrasonic dispersion for 35min to obtain a solution B;
placing the aluminum alloy substrate treated in the step (2) in a toluene solution of 3-aminopropyltrimethoxysilane, soaking for 35min, washing the toluene, sequentially cleaning with absolute ethyl alcohol and deionized water, soaking in a hydrochloric acid solution for 9min, washing with deionized water, placing in a solution B, and soaking for 1.5h to form a first layer of modified silicon dioxide, wherein the particle size of the modified silicon dioxide is 40 nm;
(4) repeating the step (3), stacking a second layer of modified silicon dioxide on the surface of the aluminum alloy substrate, wherein the particle size of the modified silicon dioxide is 20nm, and forming an intermediate layer;
(5) mixing and stirring graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent for 25min to prepare the corrosion-resistant coating; and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
In the step (3) of this embodiment, when the solution B is immersed, the aluminum alloy substrate is located in a magnetic field, and the magnetic field strength is 13 KA/m; when two layers of modified silicon dioxide in the middle layer are stacked, the adopted magnetic field intensity is the same, and the magnetic field directions are opposite.
The corrosion-resistant coating comprises the following raw materials: by weight, 5 parts of graphene oxide, 20 parts of water-based epoxy resin, 12 parts of azide epoxy resin, 4 parts of curing agent, 2.5 parts of defoaming agent, 2.4 parts of dispersing agent, 1.5 parts of film-forming assistant and 1.5 parts of flatting agent.
Comparative example 5: comparative example 5 a parameter change was made based on example 2, and in comparative example 5 no azide epoxy was added to the corrosion resistant coating, the remaining process steps and parameters were consistent with example 2.
The corrosion-resistant coating comprises the following raw materials: by weight, 5 parts of graphene oxide, 32 parts of water-based epoxy resin, 4 parts of curing agent, 2.5 parts of defoaming agent, 2.4 parts of dispersing agent, 1.5 parts of film-forming assistant and 1.5 parts of flatting agent.
And (3) testing:
1. corrosion resistance: according to GB/T1771-2007 determination of colored paint and varnish-neutral salt spray resistance, during testing, a sample is placed in a salt spray test box for salt spray testing, a NaCl solution with the mass fraction of 5% is adopted during testing, the temperature of a test room is 35 ℃, a sample A is obtained after testing, the phenomena of bubbles, corrosion and shedding on the surface of the sample A are observed, and the corrosion condition of the alloy surface is evaluated by referring to ISO 4628-2016.
2. Adhesion force: the adhesive force of the aluminum alloy surface coating is measured according to GB/T9286-1998 grid drawing test of colored paint and varnish-paint film, and the grid drawing device draws mutually crossed lines on the aluminum alloy surface during the test, applies force uniformly and forms grids to ensure that the metal matrix is exposed from the scratches.
3. Scratching the surface of the sample, wherein the scratches are mutually vertical, the length of the scratch is 80mm, the width of the scratch is 0.5mm, the scratch depth is up to the exposing of the intermediate layer, then the sample is subjected to a corrosion resistance test, a sample B is obtained after the test for 200h, the phenomena of bubbles, corrosion and falling off on the surface of the sample B are observed, and the corrosion condition of the alloy surface is evaluated by referring to ISO 4628-2016. The specific test method is as above.
And (4) conclusion: the application discloses processing technology of vapour car roof aluminum alloy casing, process design is reasonable, and easy operation, the aluminum alloy casing that obtains of preparation have excellent corrosion resisting property, and corrosion resistance is lasting, and when the corrosion-resistant coating of surface appears damaged, this aluminum alloy casing still can keep certain corrosion resisting property, has higher practicality.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The processing technology of the automobile top cover aluminum alloy shell is characterized in that: the method comprises the following steps:
(1) taking an aluminum alloy matrix, polishing the surface of the aluminum alloy matrix, putting the aluminum alloy matrix into an acetone solution, carrying out ultrasonic cleaning, putting the aluminum alloy matrix into an ethanol solution, continuously cleaning, washing with deionized water, and carrying out vacuum drying for later use;
(2) taking absolute ethyl alcohol and sodium nitrate, mixing and stirring, adding ethyl orthosilicate, adjusting pH, continuously stirring under a sealed condition, and then stirring in a water bath at 25-28 ℃ for 4-6 hours to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer;
(3) taking iron oxyhydroxide, absolute ethyl alcohol and deionized water, uniformly mixing, adding ammonia water, stirring and dispersing, adding tetraethoxysilane, continuously stirring, sequentially washing by the absolute ethyl alcohol and the deionized water, and drying in vacuum to obtain modified silicon dioxide; the particle size of the modified silicon dioxide is 40 nm;
taking modified silicon dioxide and isopropanol, and performing ultrasonic dispersion to obtain a solution B;
placing the aluminum alloy substrate treated in the step (2) in a toluene solution of 3-aminopropyltrimethoxysilane, soaking, washing the toluene, sequentially cleaning the washed toluene by absolute ethyl alcohol and deionized water, then soaking the washed toluene in a hydrochloric acid solution, washing the washed deionized water, placing the washed deionized water in a solution B, and soaking for 1-2 hours to form a first layer of modified silicon dioxide;
when the solution B is dipped, the aluminum alloy matrix is positioned in a magnetic field, and the magnetic field intensity is 12-14 KA/m;
(4) repeating the step (3), and stacking a second layer of modified silicon dioxide on the surface of the aluminum alloy substrate to form an intermediate layer; the particle size of the modified silicon dioxide is 20 nm;
when the first layer of modified silicon dioxide and the second layer of modified silicon dioxide are stacked, the adopted magnetic field intensity is the same, and the magnetic field directions are opposite;
(5) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C;
taking graphene oxide and dimethylacetamide, mixing uniformly, performing ultrasonic oscillation, adding the solution C, continuously stirring, placing under an oil bath at 160 ℃ of 150-;
mixing and stirring uniformly modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent to prepare the corrosion-resistant coating;
and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
2. The processing technology of the automobile roof aluminum alloy shell as claimed in claim 1, wherein the processing technology comprises the following steps: the method comprises the following steps:
(1) taking an aluminum alloy substrate, polishing the surface of the aluminum alloy substrate, putting the aluminum alloy substrate into an acetone solution, ultrasonically cleaning for 10-15min, then putting the aluminum alloy substrate into an ethanol solution, continuously cleaning for 10-20min, washing with deionized water, and drying in vacuum for later use;
(2) mixing anhydrous ethanol and sodium nitrate, adding ethyl orthosilicate, adjusting pH to 3, continuously stirring for 10-20min under a sealed condition, and stirring for 4-6h in a water bath at 25-28 ℃ to obtain a solution A;
placing the aluminum alloy substrate treated in the step (1) in the solution A, and electrodepositing silicon dioxide on the surface of the aluminum alloy substrate to form a transition layer;
(3) taking iron oxyhydroxide, absolute ethyl alcohol and deionized water, uniformly mixing, adding ammonia water, stirring and dispersing for 20-25min, adding tetraethoxysilane, continuously stirring for 8-10h, sequentially washing by the absolute ethyl alcohol and the deionized water, and drying in vacuum to obtain modified silicon dioxide;
taking modified silicon dioxide and isopropanol, and performing ultrasonic dispersion for 30-40min to obtain a solution B;
placing the aluminum alloy substrate treated in the step (2) in a toluene solution of 3-aminopropyltrimethoxysilane, soaking for 30-40min, washing the toluene, sequentially cleaning with absolute ethyl alcohol and deionized water, then placing in a hydrochloric acid solution, soaking for 8-10min, washing with deionized water, placing in a solution B, and soaking for 1-2h to form a first layer of modified silicon dioxide; the particle size of the modified silicon dioxide is 40 nm;
(4) repeating the step (3), stacking a second layer of modified silicon dioxide on the surface of the aluminum alloy substrate, wherein the particle size of the modified silicon dioxide is 20nm, and forming an intermediate layer;
(5) uniformly mixing polyurethane azide and dimethylacetamide to obtain a solution C;
taking graphene oxide and dimethylacetamide, uniformly mixing, carrying out ultrasonic oscillation for 1-2h, adding the solution C, continuously stirring for 10-20min, placing under an oil bath at the temperature of 150-;
mixing and stirring modified graphene oxide, water-based epoxy resin, azide epoxy resin, a curing agent, a defoaming agent, a dispersing agent, a film-forming assistant and a flatting agent for 20-30min to prepare the corrosion-resistant coating; and (4) coating the corrosion-resistant coating on the surface of the aluminum alloy substrate treated in the step (4), and drying by hot air to obtain a finished product.
3. The processing technology of the automobile roof aluminum alloy shell as claimed in claim 2, characterized in that: in the step (2), the voltage during electrodeposition is 3-5V, and the deposition time is 800-.
4. The automobile roof aluminum alloy shell prepared by the processing technology of the automobile roof aluminum alloy shell according to claim 2, characterized in that: the aluminum alloy shell comprises an aluminum alloy substrate, and a transition layer, an intermediate layer and a corrosion-resistant coating are sequentially arranged on the surface of the aluminum alloy substrate;
the transition layer is an electrodeposited silicon dioxide layer; the middle layer is formed by stacking two layers of modified silicon dioxide; the corrosion-resistant coating comprises the following raw materials: by weight, 4-6 parts of modified graphene oxide, 15-25 parts of water-based epoxy resin, 10-15 parts of azide epoxy resin, 3-5 parts of curing agent, 2-3 parts of defoaming agent, 2-2.5 parts of dispersing agent, 1-2 parts of film-forming assistant and 1-2 parts of flatting agent.
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