CN111057917A - Stainless steel-colored aluminum alloy and preparation method thereof - Google Patents
Stainless steel-colored aluminum alloy and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of aluminum alloy, in particular to a stainless steel color aluminum alloy and a preparation method thereof, wherein the stainless steel color aluminum alloy comprises the following components in percentage by weight: 0.38 to 0.41 percent of silicon, less than 0.15 percent of iron, less than 0.1 percent of copper, less than 0.1 percent of manganese, 0.48 to 0.51 percent of magnesium, less than 0.1 percent of chromium, less than 0.1 percent of zinc, less than 0.1 percent of titanium, the balance of aluminum and impurities, less than 0.05 percent of single impurity and less than 0.15 percent of total amount of impurities. The stainless steel color aluminum alloy has the color and luster of the existing stainless steel section, has the mirror surface effect of stainless steel, has lower density and lower cost than the stainless steel section, and can replace the existing stainless steel section to be applied to building decoration.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to stainless steel aluminum alloy and a preparation method thereof.
Background
The stainless steel section bar can have the effect like a mirror surface, and the polished stainless steel section bar can be used in architectural decoration, and can obtain the effect of interacting with various colors and scenery in the surrounding environment due to the reflection action of the mirror surface. Moreover, because the polished stainless steel section has strong capability of reflecting light, a glittering and translucent bright part can be formed under the coordination of lamplight, and the polished stainless steel section is more attractive in a space environment. Although the production cost of the existing aluminum alloy is much lower than that of stainless steel, most aluminum alloy sections are matte, and the mirror surface effect of the stainless steel is difficult to obtain.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide an aluminum alloy with a stainless steel color.
The invention also aims to provide a preparation method of the stainless steel-colored aluminum alloy, which is simple to operate, convenient to control, high in production efficiency and low in production cost and can be used for large-scale production.
The purpose of the invention is realized by the following technical scheme: the stainless steel-colored aluminum alloy comprises the following components in percentage by weight: 0.38 to 0.41 percent of silicon, less than 0.15 percent of iron, less than 0.1 percent of copper, less than 0.1 percent of manganese, 0.48 to 0.51 percent of magnesium, less than 0.1 percent of chromium, less than 0.1 percent of zinc, less than 0.1 percent of titanium, the balance of aluminum and impurities, less than 0.05 percent of single impurity and less than 0.15 percent of total amount of impurities.
The stainless steel-colored aluminum alloy prepared by adopting the components in percentage has the color and luster of the existing stainless steel section bar, has the mirror surface effect of the stainless steel, has lower density and lower cost than the stainless steel section bar, and can replace the existing stainless steel section bar to be applied to building decoration. Wherein, the silicon content is controlled to be 0.38-0.41 percent and the magnesium content is controlled to be 0.48-0.51 percent, the two interact, the melt fluidity of the aluminum rod is increased, the aluminum rod with the stainless steel color is easier to extrude at the temperature of 390 ℃ to 410 ℃ in the extrusion molding process of the aluminum alloy, the operating temperature of the aluminum rod is reduced, the quenching time of the aluminum alloy with the stainless steel color is shortened, the possibility of oxidation of the aluminum alloy with the stainless steel color in the quenching process is avoided, and the aluminum alloy is ensured to maintain the color and luster of the stainless steel; simultaneously, silicon and magnesium are added, and Mg formed by combining with silicon in the process of forming the aluminum alloy2Si is precipitated to form a highly dispersed aging strengthening phase, so that the strength of the aluminum alloy is greatly improved, the castability of the aluminum alloy is improved, and the cracking tendency of a casting is reduced. The iron with the percentage content is added, so that the reduction of the fluidity of the aluminum alloy caused by the overhigh iron content is avoided, the reduction of the production efficiency and the damage of the quality are avoided, the service life of a metal component in the die casting equipment is shortened, and the reduction of the mechanical property and the weakening of the corrosion resistance of a large amount of brittle metal crystals are avoided; the copper with the percentage content is added, and under the synergistic effect of the copper and the manganese, the high-temperature strength of the aluminum alloy is improved, and the problems that the corrosion resistance of the aluminum alloy is reduced due to the overhigh copper content and the quality of the aluminum alloy is damaged due to easy occurrence of hot cracks are avoided; the manganese with the percentage content is added, so that the high-temperature strength of the aluminum alloy is greatly improved, the recrystallization process of the aluminum alloy is prevented, the recrystallization temperature is increased, and recrystallized grains can be obviously refined; the addition of the chromium in percentage content can refine grains, prevent recrystallization nucleation and growth processes, play a certain role in strengthening, improve the toughness of the aluminum alloy and reduce the probability of stress cracking; the zinc with the percentage content is added and combined with the magnesium, so that the tensile strength and the yield strength of the aluminum alloy are greatly enhanced, and the aluminum alloy is prevented from being easily subjected to stress cracking due to embrittlement of the aluminum alloy caused by overhigh zinc content; the titanium with the percentage content is added to improve the mechanical property of the aluminum alloy.
More preferably, the stainless steel colored aluminum alloy comprises the following components in percentage by weight: 0.38 to 0.40 percent of silicon, 0.08 to 0.12 percent of iron, 0.05 to 0.1 percent of copper, 0.05 to 0.1 percent of manganese, 0.48 to 0.51 percent of magnesium, 0.05 to 0.1 percent of chromium, 0.05 to 0.1 percent of zinc, 0.05 to 0.1 percent of titanium, the balance of aluminum and impurities, wherein the single impurity is less than 0.05 percent, and the total amount of the impurities is less than 0.15 percent.
The other purpose of the invention is realized by the following technical scheme: the preparation method of the stainless steel color aluminum alloy comprises the following steps:
(S1), weighing the raw materials in proportion for later use;
(S2) mixing the raw materials, heating to 700-750 ℃ under the protection of argon environment for smelting, adding a refiner in the smelting process, carrying out ultrasonic homogenization treatment, slagging off and cooling to obtain an aluminum rod;
(S3) under the protection of argon, heating the aluminum bar in the step (S2) to 390-410 ℃, then adding the aluminum bar into a mold for casting, then extruding and molding, and performing quenching treatment by adopting liquid nitrogen in the extrusion process to obtain the stainless steel aluminum alloy.
The preparation method of the aluminum alloy material is simple to operate, convenient to control, high in production efficiency and low in production cost, and can be used for large-scale production. In the step (S2), oxide formation in the smelting process is avoided under the protection of argon atmosphere; in the smelting process, a refiner is added to refine crystal grains and improve the surface quality of the stainless steel colored aluminum alloy, so that the stainless steel colored aluminum alloy obtains fine isometric crystals, casting cracks can be effectively overcome, and the appearance of a casting is improved; the ultrasonic homogenization treatment is adopted, and elastic waves are introduced into the molten liquid, so that a 'cavity' phenomenon is caused in the molten liquid, the continuity of the molten liquid structure is broken, numerous microscopic real cavities are generated, hydrogen dissolved in the molten liquid quickly escapes into the cavities to form bubble cores, and the hydrogen continuously grows to escape from the molten liquid in a bubble shape, so that the refining effect is achieved. In the step (S3), the heating temperature of the aluminum rod is as low as 390-; liquid nitrogen is adopted for quenching treatment in the extrusion process, so that the phenomenon that aluminum oxide is formed on the surface of the stainless steel-colored aluminum alloy at high temperature to lose the color and luster like stainless steel is avoided.
Preferably, in the step (S2), the refiner is used in an amount of 0.05 to 0.1 wt% of the aluminum alloy, and the refiner is an aluminum-titanium-boron alloy intermediate.
By adopting the technical scheme, the aluminum alloy material is fully refined, so that the prepared alloy fiber tissue is uniform, the crystal grains are fine, the reduction of the stress corrosion cracking resistance of the aluminum alloy material due to the coarse crystal grains is avoided, the aluminum alloy material is fully refined, and TiAl is formed with aluminum2、TiB2And AlB2Phase, which becomes a non-spontaneous core during crystallization, plays a role in refining a casting structure and a weld structure, and improves the surface quality of the stainless steel colored aluminum alloyThe method can make the stainless steel aluminum alloy obtain fine isometric crystal, effectively overcome casting crack, improve the appearance of the casting and improve the strength and the glossiness of the aluminum alloy material. More preferably, the aluminum-titanium-boron alloy intermediate comprises the following components in percentage by weight: 2 to 5 percent of titanium, 0.8 to 1.4 percent of boron and the balance of aluminum, so that impurities and low-melting eutectic structures which are partially aggregated on a crystal boundary are more uniformly distributed, and the mechanical property and the processing property of the alloy are improved.
Preferably, in the step (S2), the smelting time is 45-70 min; the power of the ultrasonic homogenization treatment is 420-580W, and the time of the ultrasonic homogenization treatment is 10-20 min.
By adopting the technical scheme, the degassing is fully performed in the smelting process, and the homogenizing effect is improved, so that the strength and the glossiness of the aluminum alloy material are improved. The ultrasonic homogenization treatment with the power of 420-580W is adopted, and elastic waves are introduced into the smelting liquid, so that a 'cavity' phenomenon is caused in the smelting liquid, the continuity of the structure of the smelting liquid is destroyed, numerous microscopic true cavities are generated, hydrogen dissolved in the smelting liquid quickly escapes into the cavities to form bubble cores, and the hydrogen continuously grows and escapes from the smelting liquid in a bubble shape, so that the refining effect is achieved.
Preferably, in the step (S3), the mold is a YG8 alloy mold or a YG6 alloy mold.
By adopting the technical scheme, the die has the characteristics of high hardness, high strength, corrosion resistance, high temperature resistance, small expansion coefficient, high production efficiency and good quality of produced workpieces.
Preferably, in the step (S3), the operating temperature of the mold is 450-460 ℃.
By adopting the technical scheme, the running temperature of the die is as low as 450-460 ℃, so that the melt flowability of the aluminum bar can be ensured, and the running temperature of the die is reduced, thereby shortening the quenching time of the stainless-steel-colored aluminum alloy, avoiding the possibility of oxidation of the stainless-steel-colored aluminum alloy in the quenching process, ensuring that the aluminum alloy maintains the stainless-steel-like color and luster, improving the flowability of the aluminum alloy material in the preparation process, and making the aluminum alloy material easier to extrude and mold.
Preferably, in the step (S3), the surface temperature of the stainless-colored aluminum alloy after the quenching treatment is 20 to 40 ℃.
By adopting the technical scheme, the phenomenon that aluminum oxide is formed on the surface of the stainless steel-colored aluminum alloy at high temperature to lose the stainless steel-like color and luster is avoided.
Further, the preparation method of the stainless steel color aluminum alloy further comprises the following steps: after the rapid cooling process in the step (S3), a transparent protective paint is coated on the surface of the stainless-colored aluminum alloy, and then dried to form a transparent protective film with a thickness of 25 to 36 μm.
The transparent protective paint comprises the following raw materials in parts by weight:
the amino resin is isobutyl alcohol etherified urea resin; the fluorocarbon surfactant is formed by mixing an anionic fluorine-containing surfactant FS-62 and a non-ionic fluorine-containing surfactant DuPont FSO according to the weight ratio of 3-5: 1; the particle size of the graphene is 250-300 nm; the defoaming agent is polyethylene glycol ether, polyoxypropylene glycerol ether or polyoxypropylene; the solvent is at least two combinations of dimethylacetamide, dimethylformamide, N-methyl-2-pyrrolidone, butyrolactone and cyclohexanone. The transparent protective film formed by coating the transparent protective paint prepared from the raw materials on the surface of the stainless steel-colored aluminum alloy isolates the surface of the stainless steel-colored aluminum alloy from air, slows down the oxidation rate of the stainless steel-colored aluminum alloy, and enables the stainless steel-colored aluminum alloy to maintain the color and luster of the stainless steel for a long time; the transparent protective paint takes polyvinylidene fluoride as main resin and can reduce the surface energy of the transparent protective film under the synergistic action of the polyvinylidene fluoride and a fluorocarbon surfactant, so that the lubricity of the transparent protective film is improved, the surface friction coefficient is reduced, the hydrophobic property of the transparent protective film is improved, rainwater can wash dust on the surface of the transparent protective film in an outdoor environment, the self-cleaning property is improved, dew condensation on the surface of stainless steel aluminum alloy caused by dust accumulation under the condition of large day and night temperature difference is avoided, the corrosion of the stainless steel aluminum alloy is accelerated, and the environmental corrosion resistance of the stainless steel aluminum alloy is improved; the amino resin, the vinyltriethoxysilane and the polyamide wax act together, so that the adhesive force of a transparent protective film formed after the transparent protective paint is coated is greatly improved, the surface airtightness of the stainless steel-colored aluminum alloy is improved, and the transparent protective film is prevented from falling off; the added 0.2-0.8 part by weight of graphene can keep higher transparency of the transparent protective film, and compared with fillers such as titanium dioxide, calcium chloride and the like, the graphene-combined fluorocarbon surfactant is added, so that the dispersion uniformity is better, the thermal stability of the transparent protective film is improved, the service life of the transparent protective film is prolonged, the oxidation rate of stainless steel-colored aluminum alloy is further slowed down, and the color and luster of the stainless steel-colored aluminum alloy are clearly presented.
The preparation method of the transparent protective paint comprises the following steps:
(R1), weighing polyvinylidene fluoride, amino resin, polyamide wax, fluorocarbon surfactant, graphene, vinyl triethoxysilane, defoamer and solvent according to parts by weight for later use;
(R2), adding a fluorocarbon surfactant, vinyl triethoxysilane and graphene into the solvent, and uniformly stirring to obtain a dispersion liquid;
(R3) adding polyvinylidene fluoride, amino resin, polyamide wax and a defoaming agent into the dispersion liquid obtained in the step (R2) in sequence, and stirring for 20-30min at the temperature of 28-35 ℃ to obtain the transparent protective paint.
The preparation method for the transparent protective film is simple to operate, convenient to control, high in production efficiency, low in production cost and capable of being used for large-scale production. In the step (R2), firstly, adding the fluorocarbon surfactant, the vinyltriethoxysilane and the solvent, mixing to construct a dispersion system, then adding the graphene, and stirring uniformly, so that the obtained dispersion liquid is more uniformly dispersed, and the agglomeration phenomenon is less; and (R3) stirring at 28-35 deg.C to improve the dissolving power of the solvent for polyvinylidene fluoride, improve the dissolving efficiency, and avoid excessive volatilization of the solvent.
The invention has the beneficial effects that: the stainless steel-colored aluminum alloy provided by the invention has the color and luster of the existing stainless steel section, has the mirror surface effect of stainless steel, has lower density and lower cost than the stainless steel section, and can replace the existing stainless steel section to be applied to building decoration.
The preparation method disclosed by the invention is simple to operate, convenient to control, high in production efficiency and low in production cost, and can be used for large-scale production.
Drawings
FIG. 1 is a photograph of a product of a stainless steel colored aluminum alloy according to example 1 of the present invention;
fig. 2 is a photograph of a product of a 304 stainless steel pipe in the prior art.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.
Example 1
The stainless steel-colored aluminum alloy comprises the following components in percentage by weight: 0.40% of silicon, 0.1% of iron, 0.05% of copper, 0.04% of manganese, 0.50% of magnesium, 0.3% of chromium, 0.05% of zinc, 0.06% of titanium, the balance of aluminum and impurities, wherein the content of single impurity is less than 0.05%, and the total content of impurities is less than 0.15%.
The preparation method of the stainless steel color aluminum alloy comprises the following steps:
(S1), weighing the raw materials in proportion for later use;
(S2) mixing the raw materials, heating to 720 ℃ for smelting under the protection of argon, adding a refiner in the smelting process, carrying out ultrasonic homogenization treatment, slagging off, and cooling to obtain an aluminum bar;
(S3) under the protection of argon, heating the aluminum bar in the step (S2) to 400 ℃, then adding the aluminum bar into a mold for casting, then extruding and molding, and carrying out quenching treatment by adopting liquid nitrogen in the extrusion process to obtain the stainless steel aluminum alloy.
In the step (S2), the refiner is used in an amount of 0.08 wt% of the aluminum alloy, and the refiner is an aluminum-titanium-boron alloy intermediate.
The aluminum-titanium-boron alloy intermediate comprises the following components in percentage by weight: 4 percent of titanium, 1.1 percent of boron and the balance of aluminum.
In the step (S2), the smelting time is 52 min; the power of the ultrasonic homogenization treatment is 500W, and the time of the ultrasonic homogenization treatment is 15 min.
In the step (S3), the mold is a YG8 alloy mold.
In the step (S3), the operating temperature of the mold is 455 ℃.
In the step (S3), the surface temperature of the stainless-colored aluminum alloy after the quenching treatment is 30 ℃.
Example 2
The stainless steel-colored aluminum alloy comprises the following components in percentage by weight: 0.38% of silicon, 0.015% of iron, 0.012% of copper, 0.02% of manganese, 0.48% of magnesium, 0.03% of chromium, 0.01% of zinc, 0.01% of titanium, the balance of aluminum and impurities, wherein the content of single impurity is less than 0.05%, and the total content of impurities is less than 0.15%.
The preparation method of the stainless steel color aluminum alloy comprises the following steps:
(S1), weighing the raw materials in proportion for later use;
(S2) mixing the raw materials, heating to 700 ℃ for smelting under the protection of argon, adding a refiner in the smelting process, carrying out ultrasonic homogenization treatment, slagging off, and cooling to obtain an aluminum bar;
(S3) under the protection of argon, heating the aluminum bar in the step (S2) to 390 ℃, then adding the aluminum bar into a die for casting, then extruding and molding, and carrying out quenching treatment by adopting liquid nitrogen in the extrusion process to obtain the stainless steel aluminum alloy.
In the step (S2), the refiner is used in an amount of 0.05 wt% of the aluminum alloy, and the refiner is an aluminum-titanium-boron alloy intermediate.
The aluminum-titanium-boron alloy intermediate comprises the following components in percentage by weight: 2 percent of titanium, 0.8 percent of boron and the balance of aluminum.
In the step (S2), the melting time is 45 min; the power of the ultrasonic homogenization treatment is 420-580W, and the time of the ultrasonic homogenization treatment is 10 min.
In the step (S3), the mold is a YG8 alloy mold.
In the step (S3), the operating temperature of the mold is 450 ℃.
In the step (S3), the surface temperature of the stainless-colored aluminum alloy after the quenching treatment is 20 ℃.
Example 3
The stainless steel-colored aluminum alloy comprises the following components in percentage by weight: 0.41 percent of silicon, 0.14 percent of iron, 0.09 percent of copper, 0.09 percent of manganese, 0.51 percent of magnesium, 0.09 percent of chromium, 0.09 percent of zinc, 0.09 percent of titanium, the balance of aluminum and impurities, wherein the single impurity is less than 0.05 percent, and the total amount of the impurities is less than 0.15 percent.
The preparation method of the stainless steel color aluminum alloy comprises the following steps:
(S1), weighing the raw materials in proportion for later use;
(S2) mixing the raw materials, heating to 750 ℃ for smelting under the protection of argon, adding a refiner in the smelting process, carrying out ultrasonic homogenization treatment, slagging off, and cooling to obtain an aluminum bar;
(S3) under the protection of argon, heating the aluminum bar in the step (S2) to 410 ℃, then adding the aluminum bar into a die for casting, then extruding and molding, and carrying out quenching treatment by adopting liquid nitrogen in the extrusion process to obtain the stainless steel aluminum alloy.
In the step (S2), the refiner is used in an amount of 0.1 wt% of the aluminum alloy, and the refiner is an aluminum-titanium-boron alloy intermediate.
The aluminum-titanium-boron alloy intermediate comprises the following components in percentage by weight: 5 percent of titanium, 1.4 percent of boron and the balance of aluminum.
In the step (S2), the smelting time is 70 min; the power of the ultrasonic homogenization treatment was 580W, and the time of the ultrasonic homogenization treatment was 20 min.
In the step (S3), the mold is a YG6 alloy mold.
In the step (S3), the operating temperature of the mold is 460 ℃.
In the step (S3), the surface temperature of the stainless-colored aluminum alloy after the quenching treatment is 40 ℃.
Example 4
The stainless steel-colored aluminum alloy comprises the following components in percentage by weight: 0.39% of silicon, 0.12% of iron, 0.08% of copper, 0.08% of manganese, 0.49% of magnesium, 0.03% of chromium, 0.08% of zinc, 0.06% of titanium, the balance of aluminum and impurities, wherein the content of single impurity is less than 0.05%, and the total content of impurities is less than 0.15%.
The preparation method of the stainless steel color aluminum alloy comprises the following steps:
(S1), weighing the raw materials in proportion for later use;
(S2) mixing the raw materials, heating to 710 ℃ for smelting under the protection of argon, adding a refiner in the smelting process, carrying out ultrasonic homogenization treatment, slagging off, and cooling to obtain an aluminum bar;
(S3) under the protection of argon, heating the aluminum bar in the step (S2) to 395 ℃, adding the aluminum bar into a mold for casting, then extruding and molding, and performing quenching treatment by adopting liquid nitrogen in the extrusion process to obtain the stainless steel aluminum alloy.
In the step (S2), the refiner is used in an amount of 0.06 wt% of the aluminum alloy, and the refiner is an aluminum-titanium-boron alloy intermediate.
The aluminum-titanium-boron alloy intermediate comprises the following components in percentage by weight: 3 percent of titanium, 0.9 percent of boron and the balance of aluminum.
In the step (S2), the melting time is 50 min; the power of the ultrasonic homogenization treatment is 450W, and the time of the ultrasonic homogenization treatment is 12 min.
In the step (S3), the mold is a YG6 alloy mold.
In the step (S3), the operating temperature of the mold is 452 ℃.
In the step (S3), the surface temperature of the stainless-colored aluminum alloy after the quenching treatment is 23 ℃.
Example 5
This example differs from example 1 in that:
the preparation method of the stainless steel-colored aluminum alloy further comprises the following steps: after the quenching treatment in the step (S3), a transparent protective paint was coated on the surface of the stainless-colored aluminum alloy, and then dried to form a transparent protective film having a thickness of 30 μm.
The transparent protective paint comprises the following raw materials in parts by weight:
the amino resin is isobutyl alcohol etherified urea resin; the fluorocarbon surfactant is formed by mixing an anionic fluorine-containing surfactant FS-62 and a non-ionic fluorine-containing surfactant DuPont FSO according to the weight ratio of 4: 1; the particle size of the graphene is 280 nm; the defoaming agent is polyoxypropylene; the solvent is dimethyl acetamide and N-methyl-2-pyrrolidone according to a weight ratio of 1: 1 and mixing.
The preparation method of the transparent protective paint comprises the following steps:
(R1), weighing polyvinylidene fluoride, amino resin, polyamide wax, fluorocarbon surfactant, graphene, vinyl triethoxysilane, defoamer and solvent according to parts by weight for later use;
(R2), adding a fluorocarbon surfactant, vinyl triethoxysilane and graphene into the solvent, and uniformly stirring to obtain a dispersion liquid;
(R3) adding polyvinylidene fluoride, amino resin, polyamide wax and a defoaming agent into the dispersion liquid obtained in the step (R2) in sequence, and stirring for 25min at the temperature of 30 ℃ to obtain the transparent protective paint.
Example 6
This example differs from example 1 in that:
the preparation method of the stainless steel-colored aluminum alloy further comprises the following steps: after the quenching treatment in the step (S3), a transparent protective paint was coated on the surface of the stainless-colored aluminum alloy, and then dried to form a transparent protective film 25 μm thick.
The transparent protective paint comprises the following raw materials in parts by weight:
the amino resin is isobutyl alcohol etherified urea resin; the fluorocarbon surfactant is formed by mixing an anionic fluorine-containing surfactant FS-62 and a non-ionic fluorine-containing surfactant DuPont FSO according to the weight ratio of 3: 1; the particle size of the graphene is 250 nm; the defoaming agent is polyoxypropylene glycerol ether; the solvent is dimethylformamide and cyclohexanone according to a weight ratio of 3:1 and mixing.
The preparation method of the transparent protective paint comprises the following steps:
(R1), weighing polyvinylidene fluoride, amino resin, polyamide wax, fluorocarbon surfactant, graphene, vinyl triethoxysilane, defoamer and solvent according to parts by weight for later use;
(R2), adding a fluorocarbon surfactant, vinyl triethoxysilane and graphene into the solvent, and uniformly stirring to obtain a dispersion liquid;
(R3) adding polyvinylidene fluoride, amino resin, polyamide wax and a defoaming agent into the dispersion liquid obtained in the step (R2) in sequence, and stirring for 20min at the temperature of 28 ℃ to obtain the transparent protective paint.
Example 7
This example differs from example 1 in that:
the preparation method of the stainless steel-colored aluminum alloy further comprises the following steps: after the quenching treatment in the step (S3), a transparent protective paint was coated on the surface of the stainless-colored aluminum alloy, and then dried to form a transparent protective film having a thickness of 36 μm.
The transparent protective paint comprises the following raw materials in parts by weight:
the amino resin is isobutyl alcohol etherified urea resin; the fluorocarbon surfactant is formed by mixing an anionic fluorine-containing surfactant FS-62 and a non-ionic fluorine-containing surfactant DuPont FSO according to the weight ratio of 5: 1; the particle size of the graphene is 300 nm; the defoaming agent is polyoxypropylene; the solvent is butyrolactone and cyclohexanone in a weight ratio of 1: 1 are mixed.
The preparation method of the transparent protective paint comprises the following steps:
(R1), weighing polyvinylidene fluoride, amino resin, polyamide wax, fluorocarbon surfactant, graphene, vinyl triethoxysilane, defoamer and solvent according to parts by weight for later use;
(R2), adding a fluorocarbon surfactant, vinyl triethoxysilane and graphene into the solvent, and uniformly stirring to obtain a dispersion liquid;
(R3) adding polyvinylidene fluoride, amino resin, polyamide wax and a defoaming agent into the dispersion liquid obtained in the step (R2) in sequence, and stirring for 30min at the temperature of 35 ℃ to obtain the transparent protective paint.
Example 8
I. The stainless steel-colored aluminum alloy prepared in example 1 was formed into a tubular structure, as shown in fig. 1, and compared with a 304 stainless steel tube (as shown in fig. 2) of the Fushan Hao Metal products Ltd, it was found that the aluminum alloy prepared in example 1 had a color and luster similar to that of stainless steel.
II. Taking the stainless steel aluminum alloy prepared in the examples 1 to 4, taking the formed structure as a plate-shaped structure, cutting out the stainless steel aluminum alloy plate with the specification of 10cm by 5cm by 0.3cm, taking 3 stainless steel aluminum alloy plates of the example 1, coating transparent protective paint according to the mode of the examples 5 to 7, and then respectively testing the oxidation resistance, wherein the testing method is as follows:
and (3) testing the oxidation resistance: respectively processing for 0h, 100h and 300h at 85 + -2 deg.C and 85% + -5% relative humidity, and respectively recording the mass to 0.1 g.
The test results are shown in table 1 below:
TABLE 1
As can be seen from Table 1 above, the aluminum alloy sheet has a heavier mass, i.e., the surface aluminum alloy is oxidized to a higher degree, as the treatment time increases, while example 1 has a faster mass increase than example 5, indicating that example 5 has a significant antioxidant effect after being coated with the transparent protective paint.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (9)
1. An aluminum alloy with stainless steel color, which is characterized in that: comprises the following components in percentage by weight: 0.38 to 0.41 percent of silicon, less than 0.15 percent of iron, less than 0.1 percent of copper, less than 0.1 percent of manganese, 0.48 to 0.51 percent of magnesium, less than 0.1 percent of chromium, less than 0.1 percent of zinc, less than 0.1 percent of titanium, the balance of aluminum and impurities, less than 0.05 percent of single impurity and less than 0.15 percent of total amount of impurities.
2. The stainless steel colored aluminum alloy of claim 1, wherein: comprises the following components in percentage by weight: 0.38 to 0.40 percent of silicon, 0.08 to 0.12 percent of iron, 0.05 to 0.1 percent of copper, 0.05 to 0.1 percent of manganese, 0.48 to 0.51 percent of magnesium, 0.05 to 0.1 percent of chromium, 0.05 to 0.1 percent of zinc, 0.05 to 0.1 percent of titanium, the balance of aluminum and impurities, wherein the single impurity is less than 0.05 percent, and the total amount of the impurities is less than 0.15 percent.
3. A method of producing a stainless-colored aluminum alloy according to claim 1 or 2, characterized in that: the method comprises the following steps:
(S1), weighing the raw materials in proportion for later use;
(S2) mixing the raw materials, heating to 700-750 ℃ under the protection of argon environment for smelting, adding a refiner in the smelting process, carrying out ultrasonic homogenization treatment, slagging off and cooling to obtain an aluminum rod;
(S3) under the protection of argon, heating the aluminum bar in the step (S2) to 390-410 ℃, then adding the aluminum bar into a mold for casting, then extruding and molding, and performing quenching treatment by adopting liquid nitrogen in the extrusion process to obtain the stainless steel aluminum alloy.
4. The method of claim 3, wherein the method comprises the steps of: in the step (S2), the refiner is used in an amount of 0.05 to 0.1 wt% of the aluminum alloy, and the refiner is an aluminum-titanium-boron alloy intermediate.
5. The method of claim 4, wherein the method comprises the steps of: the aluminum-titanium-boron alloy intermediate comprises the following components in percentage by weight: 2 to 5 percent of titanium, 0.8 to 1.4 percent of boron and the balance of aluminum.
6. The method of claim 3, wherein the method comprises the steps of: in the step (S2), the smelting time is 45-70 min; the power of the ultrasonic homogenization treatment is 420-580W, and the time of the ultrasonic homogenization treatment is 10-20 min.
7. The method of claim 3, wherein the method comprises the steps of: in the step (S3), the mold is a YG8 alloy mold or a YG6 alloy mold.
8. The method of claim 3, wherein the method comprises the steps of: in the step (S3), the operating temperature of the mold is 450-.
9. The method of claim 3, wherein the method comprises the steps of: in the step (S3), after the quenching treatment, the surface temperature of the stainless-colored aluminum alloy is 20 to 40 ℃.
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