CN111363960A - Anodized thin-wall die-casting aluminum alloy material, preparation method thereof and thin-wall appearance part - Google Patents
Anodized thin-wall die-casting aluminum alloy material, preparation method thereof and thin-wall appearance part Download PDFInfo
- Publication number
- CN111363960A CN111363960A CN202010350988.XA CN202010350988A CN111363960A CN 111363960 A CN111363960 A CN 111363960A CN 202010350988 A CN202010350988 A CN 202010350988A CN 111363960 A CN111363960 A CN 111363960A
- Authority
- CN
- China
- Prior art keywords
- thin
- die
- aluminum alloy
- casting
- alloy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
Abstract
The invention provides an anodized thin-wall die-casting aluminum alloy material, a preparation method thereof and a thin-wall appearance piece, and relates to the technical field of aluminum alloy. The aluminum alloy material provided by the invention comprises the following components in percentage by mass: 1.8-2.0% of Mn, 0-1.5% of Mg, 0-2.0% of Zn, 0.2-0.5% of Fe, 0.05-0.2% of Sc, 0.05-0.2% of Zr, 0.05-0.3% of RE, and the balance of Al and inevitable impurities; the total mass content of Mg and Zn is 1-3%. The aluminum alloy material provided by the invention has good mechanical property, high fluidity and good die-casting forming effect, and can be used for die-casting thin-walled parts with the minimum wall thickness of 0.6 mm; but also can effectively carry out anodic oxidation to obtain an anodic oxidation film layer with compact and uniform porous layer, good corrosion resistance and good dyeing effect, thereby obtaining a decorative level thin-wall appearance piece; the preparation method is simple.
Description
Technical Field
The invention relates to the technical field of aluminum alloy, in particular to an anodized thin-wall die-casting aluminum alloy material, a preparation method thereof and a thin-wall appearance piece.
Background
The aluminum alloy material has the advantages of light weight, high specific strength, high hardness and good heat conductivity, and is easy to meet the supporting, protecting, light and radiating functions of the shell, particularly, the appearance of the aluminum alloy piece after being subjected to anodic oxidation and dyeing is greatly improved in aesthetic property and texture, so that the aluminum alloy plays an important role in the appearance material of the 3C product. The mainstream processing technology of the existing aluminum alloy shell is CNC (computerized numerical control) processing, and a CNC processing method selects wrought aluminum alloy (such as 6063) as a material, so that the anode oxidation effect is good, the shell with rich colors is easy to obtain, but the CNC processing has the defects of great waste of raw materials, complex processing procedures, and high production period and cost. The die casting is a precise forming and near-net forming technology, can directly and quickly form complex shapes, can greatly reduce the machining amount and the waste of raw materials by using a die casting to produce aluminum alloy appearance pieces, has remarkable economic benefit and has important application value.
The die casting of the 3C product shell belongs to thin-wall die casting, and the alloy is required to have higher fluidity due to the chilling action caused by small wall thickness. At present, Al-Si (such as ADC12) alloy is most applied to thin-wall die casting, and the alloy has the advantages of low eutectic temperature, large latent heat, more strengthening phases, excellent fluidity and higher mechanical property. However, since the Al — Si alloy contains a large amount of Si phase and Si inhibits the growth of an anodic oxide film during the anodic oxidation process, the Al — Si alloy cannot be anodized at a decorative level, and a thin-walled exterior member with a decorative surface cannot be obtained.
Disclosure of Invention
In view of the above, the present invention aims to provide an anodized thin-walled die-cast aluminum alloy material, a preparation method thereof, and a thin-walled appearance member. The thin-wall die-casting aluminum alloy material provided by the invention has the advantages of good mechanical property, high fluidity and good die-casting forming effect; but also can effectively carry out anodic oxidation to obtain decorative thin-wall appearance pieces.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an anodized thin-wall die-casting aluminum alloy material which comprises the following components in percentage by mass:
the balance of Al and inevitable impurities;
wherein RE is a rare earth element, the total mass percentage of Mg and Zn is 1-3%, and the mass percentage of impurities is not more than 0.05%.
Preferably, the mass ratio of Zr to Sc is 1: 1.
The invention provides a preparation method of the thin-wall die-casting aluminum alloy material capable of being anodized, which comprises the following steps:
(1) smelting industrial pure aluminum, an Al-10Mn intermediate alloy and an Al-10Fe intermediate alloy at 720-750 ℃ in an inert atmosphere to obtain a first alloy liquid;
(2) sequentially smelting and refining the first alloy liquid, Al-2Sc intermediate alloy and Al-10Zr intermediate alloy at 720-750 ℃ to obtain second alloy liquid;
(3) sequentially smelting and refining the second alloy liquid, industrial pure magnesium, industrial pure zinc and Al-10RE intermediate alloy at 680-720 ℃ to obtain a third alloy liquid;
(4) and die-casting the third alloy liquid, and obtaining the anodic-oxidizable thin-wall die-casting aluminum alloy material after demolding and cooling.
Preferably, after the refining in the step (3), continuously introducing inert gas into the obtained melt for 20-30 min.
Preferably, the conditions for die casting in the step (4) include: the injection specific pressure is 90-110 MPa, the injection speed is 3-5 m/s, the pouring temperature of molten alloy is 680-720 ℃, the mold temperature is 160-200 ℃, and the pressure maintaining time is 2-5 s.
Preferably, the cooling in the step (4) is air cooling, and the duration of the air cooling is 30-60 s.
The invention also provides a thin-wall appearance part, which is obtained by carrying out surface treatment on the thin-wall die-casting aluminum alloy material in the scheme or the thin-wall die-casting aluminum alloy material prepared by the preparation method in the scheme;
the surface treatment method comprises the following steps: and carrying out direct current constant current sulfuric acid anodic oxidation on the thin-wall die-casting aluminum alloy material.
Preferably, the temperature of the direct current constant current sulfuric acid anodic oxidation is 20-30 ℃, and the current density is 15mA/cm2The energization time was 30 min.
Preferably, the mass concentration of the sulfuric acid adopted by the direct current constant current sulfuric acid anodic oxidation is 150 g/L.
The invention provides an anodized thin-wall die-casting aluminum alloy material which comprises the following components in percentage by mass: 1.8-2.0% of Mn1.8, 1.5% of Mg0, 2.0-2.0% of Zn0, 0.2-0.5% of Fe0.05-0.2% of Sc0.05-0.2%, 0.05-0.2% of Zr0.05-0.3% of RE, and the balance of Al and inevitable impurities; wherein the total mass content of Mg and Zn is 1-3%, and the mass content of impurities is not more than 0.05%. The thin-wall die-casting aluminum alloy material capable of being anodized provided by the invention optimizes chemical components and proportion, and fully utilizes the positive effects of various alloy elements on the die-casting performance, the mechanical property and the anodic oxidation performance of aluminum alloy: mn element is controlled to be about 1.9 percent of eutectic point, and the generated eutectic Al6Mn phases are less and uniformly distributed, so that the anode oxidation effect is ensured while the fluidity is ensured; mg element is controlled to be 0-1.5%, Zn element is controlled to be 0-2.0%, the total content of Mg and Zn is controlled to be 1-3%, and under the quenching action of thin-wall die casting, all solid solution in an Al matrix can be ensured to obtain an obvious solid solution strengthening effect; the Fe element is controlled to be 0.2-0.5%, on one hand, the die casting demolding is facilitated, and on the other hand, a fine and uniformly distributed Al-Fe phase or Al is formed under the modification effect of the Mn element6(Mn, Fe) phase strengthening matrix; sc and Zr are respectively controlled to be 0.05-0.2%, and the generated Al3(Sc, Zr) has obvious effect of refining crystal grains, and further improves the mechanical property of the alloy; RE element is controlled to be 0.05-0.3%, the melt can be purified, the oxidation of Al, Mg and other elements is reduced, the surface tension is reduced, and the fluidity is improved. The aluminum alloy material provided by the invention has the advantages that the main additive elements Mn, Mg and Zn have higher solubility in aluminum, especially under the high cooling speed condition of die casting; the addition amounts of the trace elements Fe, Sc, Zr and Re are small, the generated second phase is relatively small, the surface of the aluminum alloy basically takes an aluminum matrix as a main part, the electrochemical properties are uniform and balanced, the nucleation speed and the growth speed of an anodic oxide film are basically consistent, the obtained film layer is dense and uniform, and the dense and uniform porous layer is beneficial to improving the corrosion resistance and the dyeing effect. Therefore, the thin-wall die-casting aluminum alloy material provided by the invention has the advantages of good mechanical property, high fluidity and good die-casting forming effect, and can be used for die-casting thin-wall parts with the minimum wall thickness of 0.6 mm; and can effectively carry out anodic oxidation to obtain an anodic oxidation film layer with compact and uniform porous layer, good corrosion resistance and good dyeing effect, thereby obtaining a decorative grade thin-wall appearance piece.
The embodiment result shows that the thin-wall die-casting aluminum alloy material provided by the invention has the flowing property of more than 80%, the tensile strength of more than 200MPa, the film layer of the thin-wall die-casting aluminum alloy material after anodic oxidation is yellow, the color is bright, the film layer is compact and uniform, the color difference value is small, the film layer is thicker and smoother, and compared with ADC12, the thin-wall die-casting aluminum alloy material is more suitable for die-casting production of thin-wall appearance parts needing surface decoration.
The preparation method of the anodic-oxidizable thin-wall die-casting aluminum alloy material provided by the invention is simple and convenient to operate, the defects of the formed die-casting are few, and the large-scale production is facilitated.
The invention also provides a thin-wall appearance piece, the surface film layer is compact and uniform, the dyeing color difference is small, and the corrosion resistance is good.
Drawings
FIG. 1 is a metallographic micrograph of a die-cast alloy part obtained in example 1;
FIG. 2 is a metallographic micrograph of thin-walled die cast alloy ADC12 of comparative example 1;
FIG. 3 is a macroscopic photomicrograph of a thin-walled cosmetic article from the anodization of example 1;
FIG. 4 is a macroscopic photomicrograph of a thin-walled appearance obtained by anodic oxidation of comparative example 1;
FIG. 5 is a SEM image of the microstructure of the thin-walled workpiece film obtained by anodic oxidation in example 1;
fig. 6 is a SEM picture of the micro-morphology of the thin-walled outer member film layer obtained by the anodic oxidation of comparative example 1.
Detailed Description
The invention provides an anodized thin-wall die-casting aluminum alloy material which comprises the following components in percentage by mass:
the balance of Al and inevitable impurities;
wherein RE is a rare earth element, the total mass percentage of Mg and Zn is 1-3%, and the mass percentage of impurities is not more than 0.05%.
The thin-wall die-casting aluminum alloy material capable of being anodized, which is provided by the invention, comprises 1.8-2.0% of Mn1.8, and preferably 1.9% in percentage by mass. The Mn element is controlled to be about 1.9 percent of eutectic point, and the generated eutectic Al6Mn phases are less and uniformly distributed, and the anode oxidation effect is ensured while the fluidity is ensured.
The thin-wall die-casting aluminum alloy material capable of being anodized comprises, by mass, 0.5-1.5% of Mg0 and 2.0% of Zn0, preferably 0.5-1.0% of Zn; the total mass content of Mg and Zn is 1-3%, and preferably 1.5-2%. In the present invention, Mg and Zn in the above contents can be completely dissolved in the Al matrix by the quenching action of the thin-wall die casting, and a significant solid solution strengthening effect can be obtained.
The thin-wall die-casting aluminum alloy material capable of being anodized, which is provided by the invention, comprises 0.2-0.5% of Fe0.2-0.3% of Fe0% by mass percentage, preferably 0.2-0.3% of Fe0% by mass percentage. The invention controls the Fe element to be 0.2-0.5%, one side isThe surface is beneficial to die casting demoulding, and on one hand, a fine and evenly distributed Al-Fe phase or Al is formed under the modification action of Mn element6The (Mn, Fe) phase strengthens the matrix and improves the mechanical property of the aluminum alloy material.
The anodic-oxidizable thin-wall die-casting aluminum alloy material comprises, by mass, 0.05-0.2% of Sc0.05 and 0.05-0.2% of Zr0.05, and preferably 0.1-0.2% of Zr0.05 and Zr0.2% of Zr0.2%. In the present invention, the mass ratio of Zr to Sc is preferably 1: 1. The Sc and Zr elements are respectively controlled to be 0.05-0.2%, and the generated Al3The (Sc, Zr) has obvious effect of refining crystal grains, and further improves the mechanical property of the alloy.
The thin-wall die-casting aluminum alloy material capable of being anodized, which is provided by the invention, comprises 0.05-0.3% of RE (RE), preferably 0.1-0.3% by mass. In the invention, RE is a rare earth element, preferably one or more of La, Ce and Y. RE element is controlled to be 0.05-0.3%, the melt can be purified, the oxidation of Al, Mg and other elements is reduced, the surface tension is reduced, and the fluidity of the alloy is improved.
The thin-wall die-casting aluminum alloy material capable of being anodized provided by the invention also comprises the balance of Al and inevitable impurities; the mass content of the impurities is not more than 0.05%. In the invention, the aluminum is used as a matrix of the thin-wall die-casting aluminum alloy material; the impurities are inevitable impurities in the production of aluminum and aluminum alloy, and may be impurity elements such as Cr, V, Si, Ga and the like.
The chemical components and the proportion of the alloy are optimized, and the positive effects of all alloy elements on the die-casting performance, the mechanical property and the anode oxidizing performance of the aluminum alloy are fully utilized, so that the provided thin-wall die-casting aluminum alloy material has the advantages of good mechanical property, high fluidity and good die-casting forming effect, and can be used for die-casting thin-wall parts with the minimum wall thickness of 0.6 mm; and can effectively carry out anodic oxidation to obtain an anodic oxidation film layer with compact and uniform porous layer, good corrosion resistance and good dyeing effect, thereby obtaining a decorative grade thin-wall appearance piece.
The invention provides a preparation method of the thin-wall die-casting aluminum alloy material capable of being anodized, which comprises the following steps:
(1) smelting industrial pure aluminum, an Al-10Mn intermediate alloy and an Al-10Fe intermediate alloy at 720-750 ℃ in an inert atmosphere to obtain a first alloy liquid;
(2) sequentially smelting and refining the first alloy liquid, Al-2Sc intermediate alloy and Al-10Zr intermediate alloy at 720-750 ℃ to obtain second alloy liquid;
(3) sequentially smelting and refining the second alloy liquid, industrial pure magnesium, industrial pure zinc and Al-10RE intermediate alloy at 680-720 ℃ to obtain a third alloy liquid;
(4) and die-casting the third alloy liquid, and obtaining the anodic-oxidizable thin-wall die-casting aluminum alloy material after demolding and cooling.
In the invention, under an inert atmosphere, smelting industrial pure aluminum, Al-10Mn intermediate alloy and Al-10Fe intermediate alloy at 720-750 ℃ to obtain first alloy liquid. The inert atmosphere is not particularly required in the present invention, and those known to those skilled in the art can be used. In the present invention, the melting is preferably performed in a heating furnace. The source of the industrial pure aluminum, the Al-10Mn intermediate alloy and the Al-10Fe intermediate alloy is not particularly required by the invention, and the corresponding metal materials with the sources well known by the technicians in the field can be adopted.
After the first alloy liquid is obtained, the first alloy liquid, the Al-2Sc intermediate alloy and the Al-10Zr intermediate alloy are sequentially smelted and refined at 720-750 ℃ to obtain a second alloy liquid. The source of the Al-2Sc master alloy and the Al-10Zr master alloy is not particularly required, and the corresponding alloy materials with the sources well known by the technicians in the field can be adopted. In the present invention, the Al-2Sc master alloy and the Al-10Zr master alloy are preferably melted by pressing them into the first alloy liquid, thereby preventing burning loss. In the present invention, the refining method is preferably: after the first alloy liquid, Al-2Sc intermediate alloy and Al-10Zr intermediate alloy are smelted at the temperature of 720-750 ℃, under the condition of stirring, adding a refining agent into the obtained alloy liquid for slagging off to obtain a second alloy liquid; the refining agent is preferably Na2SiF6、KCl、Na3AlF6And C2Cl6The mass of the refining agent is 0.4-0.6% of that of the alloy liquid obtained after smelting.
After the second alloy liquid is obtained, the second alloy liquid, industrial pure magnesium, industrial pure zinc and Al-10RE intermediate alloy are sequentially smelted and refined at 680-720 ℃ to obtain a third alloy liquid. The source of the industrial pure magnesium, the industrial pure zinc and the Al-10RE intermediate alloy is not particularly required by the invention, and the metal materials with the source well known to the technical personnel in the field can be adopted. The invention preferably presses the industrial pure magnesium, the industrial pure zinc and the Al-10RE intermediate alloy into the second alloy liquid for smelting, thereby preventing burning loss. In the present invention, the refining scheme is the same as the above scheme, and is not described herein again. After refining, inert gas is preferably continuously introduced into the obtained melt for 20-30 min, the high-temperature melt is easy to oxidize, and the inert gas is introduced to prevent oxidation and burning loss and stabilize the melt.
In the invention, the mass of the industrial pure aluminum, the Al-10Mn intermediate alloy, the Al-10Fe intermediate alloy, the Al-2Sc intermediate alloy, the Al-10Zr intermediate alloy, the industrial pure magnesium, the industrial pure zinc and the Al-10RE intermediate alloy is correspondingly configured according to the mass content of each element in the thin-wall die-casting aluminum alloy material capable of being anodized. The invention adopts three steps (step (1) to step (3)) to smelt the alloy, thereby reducing the burning loss of Sc, Mg and RE elements.
And after obtaining the third alloy liquid, die-casting the third alloy liquid, demolding and cooling to obtain the thin-wall die-casting aluminum alloy material capable of being anodized. In the present invention, the die casting conditions include: the injection specific pressure is preferably 90-110 MPa, the injection speed is 3-5 m/s, the pouring temperature of molten alloy is 680-720 ℃, the die temperature is 160-200 ℃, and the pressure maintaining time is 2-5 s. The die casting device of the present invention is not particularly limited, and a die casting device known to those skilled in the art may be used. In the invention, the cooling is preferably air cooling, in particular compressed air cooling is carried out on the casting immediately after demoulding; the duration time of air cooling is preferably 30-60 s, and a large amount of elements such as Mg and Zn are guaranteed to be dissolved in Al in a solid mode.
The preparation method of the anodic-oxidizable thin-wall die-casting aluminum alloy material provided by the invention is simple and convenient to operate, the defects of the formed die-casting are few, and the large-scale production is facilitated.
The invention also provides a thin-wall appearance part, which is obtained by performing surface treatment on the thin-wall die-casting aluminum alloy material prepared by the preparation method of the scheme or the thin-wall die-casting aluminum alloy material prepared by the preparation method of the scheme;
the surface treatment method comprises the following steps: and carrying out direct current constant current sulfuric acid anodic oxidation on the thin-wall die-casting aluminum alloy material.
In the invention, the temperature of the direct current constant current sulfuric acid anodic oxidation is preferably 20-30 ℃, and the current density is preferably 15mA/cm2The electrifying time is preferably 30 min; the mass concentration of the sulfuric acid adopted by the direct-current constant-current sulfuric acid anodic oxidation is preferably 150 g/L.
The thin-walled appearance part provided by the invention has the advantages of compact and uniform surface film layer, small dyeing color difference and good corrosion resistance.
The thin-walled anodized aluminum die-cast alloy material, the method for producing the same, and the thin-walled exterior part according to the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
An anodizable thin-walled die-cast aluminum alloy material, the aluminum alloy having a chemical composition (in mass percent) of: 1.9 percent of Mn, 1.0 percent of Mg1.0 percent of Zn1.0 percent of Fe0.3 percent of Sc0.1 percent of Zr0.1 percent of RE (rare earth element Y)0.3 percent of RE, and the balance of Al and inevitable impurities, wherein the content of the impurities is not more than 0.05 percent; the preparation method comprises the following steps:
(1) preparing materials: according to the chemical composition and proportion of the aluminum alloy material, taking industrial pure aluminum as a base material, and sequentially weighing industrial pure magnesium, industrial pure zinc, Al-10Mn intermediate alloy, Al-10Fe intermediate alloy, Al-10Zr intermediate alloy, Al-2Sc intermediate alloy and Al-10RE intermediate alloy;
(2) smelting and refining: putting industrial pure aluminum, Al-10Mn and Al-10Fe into a heating furnace at 750 ℃ under an inert atmosphere, preserving heat after all the aluminum, Al-2Sc and Al-10Zr intermediate alloy are melted, continuously stirring for 5min after all the aluminum, Al-10Mn and Al-10Fe are melted, and adding a refining agent accounting for 0.5 percent of the mass of the molten liquid for slagging off; then cooling to 700 ℃, adding industrial pure Mg, industrial pure Zn and Al-10RE, continuously stirring for 5min after melting, and adding a refining agent accounting for 0.5 percent of the mass of the molten liquid for slagging off; after refining, continuously introducing inert gas, and stabilizing the melt for 20 min;
(3) die casting: preheating a die to 160 ℃ by using a die temperature machine, adjusting parameters of a die casting machine, setting the injection specific pressure to be 100MPa and the injection speed to be 4m/s, immediately conveying the molten metal at 700 ℃ to an injection chamber for die casting, maintaining the pressure for 2s, and then demolding; and (3) cooling the demolded die casting by air for 30s to obtain the thin-wall die casting aluminum alloy material capable of being anodized.
The minimum wall thickness of the obtained die-casting alloy piece is 0.6mm, and the die-casting alloy piece is easy to demould; the metallographic micrograph of the resulting die-cast alloy piece is shown in FIG. 1, and it can be seen from FIG. 1 that the second phase content in the alloy is small and is finely and uniformly distributed on the aluminum matrix, which is advantageous for the anodizing effect.
A thin-wall appearance part is prepared by the following steps: performing surface treatment on the obtained thin-wall die-casting aluminum alloy material by using a direct-current constant-current sulfuric acid anodic oxidation method at 25 ℃; the current density is 15mA/cm2The electrifying time is 30min, and the mass concentration of the sulfuric acid electrolyte is 150 g/L.
The obtained macroscopic optical photo of the thin-wall appearance piece is shown in figure 3, and the obtained thin-wall appearance piece is in yellow color, bright in color and dense and uniform in film layer macroscopically; fig. 5 is a SEM picture of the microstructure of the resulting thin-walled surface piece, and it can be seen from fig. 5 that a dense and uniform porous layer is obtained after anodization.
Example 2
An anodizable thin-walled die-cast aluminum alloy material, the aluminum alloy having a chemical composition (in mass percent) of: mn1.9%, Mg1.5%, Zn 0%, Fe0.3%, Sc0.1%, Zr0.1%, RE (rare earth element Y) 0.3%, and the balance of Al and inevitable impurities, wherein the impurity content is not more than 0.05%; the preparation method is the same as example 1.
The minimum wall thickness of the obtained die-casting alloy piece is 0.6mm, and the die-casting alloy piece is easy to demould; anodizing the die-casting alloy part according to the method in the embodiment 1 to obtain a thin-wall appearance part, wherein a macroscopic optical photo of the obtained thin-wall appearance part is similar to that shown in fig. 3, and the obtained thin-wall appearance part is in a yellow color, bright in color and dense and uniform in film layer macroscopically; the microstructure of the resulting thin-walled appearance was similar to that of fig. 5, and a dense and uniform porous layer was obtained after anodization.
Example 3
An anodizable thin-walled die-cast aluminum alloy material, the aluminum alloy having a chemical composition (in mass percent) of: mn1.9%, Mg 0%, Zn 2%, Fe0.3%, Sc0.2%, Zr0.2%, RE (rare earth element Y) 0.2%, and the balance of Al and inevitable impurities, wherein the impurity content is not more than 0.05%; the preparation method is the same as example 1.
The minimum wall thickness of the obtained die-casting alloy piece is 0.6mm, and the die-casting alloy piece is easy to demould; anodizing the die-casting alloy part according to the method in the embodiment 1 to obtain a thin-wall appearance part, wherein a macroscopic optical photo of the obtained thin-wall appearance part is similar to that shown in fig. 3, and the obtained thin-wall appearance part is in a yellow color, bright in color and dense and uniform in film layer macroscopically; the microstructure of the resulting thin-walled appearance was similar to that of fig. 5, and a dense and uniform porous layer was obtained after anodization.
Comparative example 1
Selecting commercial thin-wall die-casting alloy ADC12 as a comparative example, wherein the chemical composition (in mass percentage) of ADC12 is Si9.6-12%; 1.5-3.5% of Cu1; fe < 1.3%, and the balance being aluminum. The metallographic micrograph of the thin-walled die-cast alloy ADC12 is shown in fig. 2, and it can be seen from fig. 2 that a large amount of Si phase is present in the alloy, and part of the Si phase is distributed in the form of needles and part of the Si phase is distributed in the form of blocks, and a large amount of the second phase is disadvantageous to the anodic oxidation effect.
The method of example 1 is adopted to anodize ADC12, and FIG. 4 is a macroscopic optical photograph of the appearance piece after the anodic oxidation of ADC12, the visible film layer is gray black, the color is not uniform, and the unsmooth surface of the film layer can be obviously observed; fig. 6 is a SEM image of the microstructure of the ADC12 anodic oxide film layer, and it can be observed that the porous morphology of the ADC12 anodic oxide film layer is not uniform, and a large area of unoxidized area exists.
The thin-wall die-cast aluminum alloy pieces and the thin-wall appearance pieces in examples 1 to 3 and comparative example 1 were subjected to an effect test:
the test of the thin-wall die-casting aluminum alloy part comprises the test of fluidity and tensile strength, and the test of the thin-wall appearance part comprises the test of film thickness, film roughness and film color difference value; the test method comprises the following steps:
(a) fluidity: the fluidity of the alloy is tested by adopting a metal type single-spiral fluidity testing mold, the larger the fluidity of the alloy is, the better the mold filling effect is during die casting, after the thin-wall die-casting aluminum alloy is heated and melted, uniformly stirred, refined and slag removed and melt stabilization treatment is carried out, the melt is cast into a spiral testing mold preheated to 200 ℃, the casting temperature is 750 ℃, and after the mold is cooled, a string and a tape measure are used for measuring the flowing length of the alloy; in order to ensure the reliability of the data, the arithmetic mean value of the flow length of 5 times of the same alloy at the same casting temperature is taken as a result;
(b) tensile strength: tensile testing was carried out using a model SHIMADZU AG-X100KN Universal testing machine (Shimadzu, Japan), the tensile specimen dimensions were processed according to ASTM E8M-04, the tensile rate was 1 mm/min, 3 specimens were prepared for each alloy, and the tensile strength was taken as the arithmetic average of the 3 specimens;
(c) film thickness: measuring the thickness of the anodic oxide film layer by using a Surfix-FNB type eddy current thickness gauge (Germany PHYNIX);
(d) film roughness: measuring the roughness of the anodic oxide film layer by using a 3D surface profiler (VEECO in America);
(e) the color difference value of the film layer is as follows: the color difference of the film layer was measured and calculated using a CM-2300D type spectrophotometer of guangzhou new technology (council) instruments.
The test results of the thin-walled die-cast aluminum alloy material and the thin-walled appearance member in examples 1 to 3 and comparative example 1 are shown in table 1:
table 1 test results of thin-walled die-cast aluminum alloy materials and thin-walled exterior members in examples 1 to 3 and comparative example 1
| Fluidity/% | Tensile strength/MPa | Film thickness/mum | Roughness/mum of film layer | Color difference of film | |
| Comparative example 1 | 100％ | 218 | 11.8 | 4.54 | 1.77 |
| Example 1 | 82％ | 228 | 16.3 | 1.57 | 0.76 |
| Example 2 | 80％ | 220 | 16.1 | 1.54 | 0.80 |
| Example 3 | 85％ | 203 | 15.8 | 1.64 | 0.72 |
As can be seen from table 1, the fluidity of the alloy material in examples 1 to 3 reaches more than 80% of that of ADC12, the tensile strength exceeds 200MPa, and meanwhile, the color difference value of the anodic oxidation film layer of the alloy material in examples 1 to 3 is small, the film layer is thicker and smoother, and it can be seen that the alloy material of the present invention has good comprehensive properties of fluidity, mechanical properties and anodic oxidation effect, and compared with ADC12, the alloy material of the present invention is more suitable for die casting production of thin-walled exterior parts requiring surface decoration.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. An anodized thin-wall die-casting aluminum alloy material comprises the following components in percentage by mass:
the balance of Al and inevitable impurities;
wherein RE is a rare earth element, the total mass percentage of Mg and Zn is 1-3%, and the mass percentage of impurities is not more than 0.05%.
2. The anodizable thin-walled die-cast aluminum alloy material according to claim 1, wherein the mass ratio of Zr to Sc is 1: 1.
3. A method for producing the anodizable thin-walled die-cast aluminum alloy material according to claim 1 or 2, comprising the steps of:
(1) smelting industrial pure aluminum, an Al-10Mn intermediate alloy and an Al-10Fe intermediate alloy at 720-750 ℃ in an inert atmosphere to obtain a first alloy liquid;
(2) sequentially smelting and refining the first alloy liquid, Al-2Sc intermediate alloy and Al-10Zr intermediate alloy at 720-750 ℃ to obtain second alloy liquid;
(3) sequentially smelting and refining the second alloy liquid, industrial pure magnesium, industrial pure zinc and Al-10RE intermediate alloy at 680-720 ℃ to obtain a third alloy liquid;
(4) and die-casting the third alloy liquid, and obtaining the anodic-oxidizable thin-wall die-casting aluminum alloy material after demolding and cooling.
4. The preparation method according to claim 3, wherein after the refining in the step (3), the method further comprises continuously introducing inert gas into the obtained melt for 20-30 min.
5. The production method according to claim 3, wherein the conditions for the die casting in the step (4) include: the injection specific pressure is 90-110 MPa, the injection speed is 3-5 m/s, the pouring temperature of molten alloy is 680-720 ℃, the mold temperature is 160-200 ℃, and the pressure maintaining time is 2-5 s.
6. The method according to claim 3, wherein the cooling in the step (4) is air cooling, and the duration of the air cooling is 30-60 s.
7. A thin-walled appearance part is characterized in that the thin-walled die-cast aluminum alloy material is obtained by surface treatment of the thin-walled die-cast aluminum alloy material according to any one of claims 1 to 2 or the thin-walled die-cast aluminum alloy material prepared by the preparation method according to any one of claims 3 to 6;
the surface treatment method comprises the following steps: and carrying out direct current constant current sulfuric acid anodic oxidation on the thin-wall die-casting aluminum alloy material.
8. The thin-walled appearance of claim 7, characterized in thatCharacterized in that the temperature of the direct current constant current sulfuric acid anodic oxidation is 20-30 ℃, and the current density is 15mA/cm2The energization time was 30 min.
9. The thin-walled appearance of claim 7 or 8, wherein the mass concentration of sulfuric acid used for the DC constant-current sulfuric acid anodizing is 150 g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010350988.XA CN111363960A (en) | 2020-04-28 | 2020-04-28 | Anodized thin-wall die-casting aluminum alloy material, preparation method thereof and thin-wall appearance part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010350988.XA CN111363960A (en) | 2020-04-28 | 2020-04-28 | Anodized thin-wall die-casting aluminum alloy material, preparation method thereof and thin-wall appearance part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111363960A true CN111363960A (en) | 2020-07-03 |
Family
ID=71205620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010350988.XA Pending CN111363960A (en) | 2020-04-28 | 2020-04-28 | Anodized thin-wall die-casting aluminum alloy material, preparation method thereof and thin-wall appearance part |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111363960A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0918095B1 (en) * | 1997-11-20 | 2003-03-26 | Alcan Technology & Management AG | Process of manufacturing a structural element made of a die-cast aluminium alloy |
| CN101724880A (en) * | 2008-10-24 | 2010-06-09 | 比亚迪股份有限公司 | Electrolyte, anodization method and anodized silicon-aluminum alloy |
| CN102127665A (en) * | 2010-01-15 | 2011-07-20 | 北京有色金属研究总院 | Al-Zn-Mg-Cu-Sc-Zr-RE alloy capable of being used as ultrahigh-strength cast aluminum alloy and preparation method thereof |
| CN103834834A (en) * | 2014-03-12 | 2014-06-04 | 苏州凯宥电子科技有限公司 | Anode-oxidable high-performance die-casting aluminum alloy and preparation method thereof |
| CN105112736A (en) * | 2015-09-07 | 2015-12-02 | 苏州凯宥电子科技有限公司 | Die-cast aluminum alloy and preparing method thereof |
| CN110106403A (en) * | 2019-05-27 | 2019-08-09 | 华南理工大学 | It is a kind of can anodic oxidation Al-Mn system cast aluminium alloy gold and its anode oxidation process |
| CN110453115A (en) * | 2019-09-04 | 2019-11-15 | 东莞理工学院 | A kind of automotive speed changer die casting for shell aluminium alloy and its preparation process |
-
2020
- 2020-04-28 CN CN202010350988.XA patent/CN111363960A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0918095B1 (en) * | 1997-11-20 | 2003-03-26 | Alcan Technology & Management AG | Process of manufacturing a structural element made of a die-cast aluminium alloy |
| CN101724880A (en) * | 2008-10-24 | 2010-06-09 | 比亚迪股份有限公司 | Electrolyte, anodization method and anodized silicon-aluminum alloy |
| CN102127665A (en) * | 2010-01-15 | 2011-07-20 | 北京有色金属研究总院 | Al-Zn-Mg-Cu-Sc-Zr-RE alloy capable of being used as ultrahigh-strength cast aluminum alloy and preparation method thereof |
| CN103834834A (en) * | 2014-03-12 | 2014-06-04 | 苏州凯宥电子科技有限公司 | Anode-oxidable high-performance die-casting aluminum alloy and preparation method thereof |
| CN105112736A (en) * | 2015-09-07 | 2015-12-02 | 苏州凯宥电子科技有限公司 | Die-cast aluminum alloy and preparing method thereof |
| CN110106403A (en) * | 2019-05-27 | 2019-08-09 | 华南理工大学 | It is a kind of can anodic oxidation Al-Mn system cast aluminium alloy gold and its anode oxidation process |
| CN110453115A (en) * | 2019-09-04 | 2019-11-15 | 东莞理工学院 | A kind of automotive speed changer die casting for shell aluminium alloy and its preparation process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103484737B (en) | Aluminum alloy digital electronic product case and application thereof | |
| CN103834834B (en) | Anode-oxidable high-performance die-casting aluminum alloy and preparation method thereof | |
| JP5931150B2 (en) | Aluminum alloy for die casting, metal case for portable electric device, and manufacturing method thereof | |
| CN103526088B (en) | A kind of digital electronic goods aluminium diecast alloy | |
| CN109628804B (en) | High-strength aluminum alloy with excellent oxidation effect and preparation method thereof | |
| CN105112736A (en) | Die-cast aluminum alloy and preparing method thereof | |
| CN105189795B (en) | Aluminum alloy plate having high-strength alumite coating film for electronic equipment frame and manufacturing method of aluminum alloy plate | |
| CN107447134B (en) | A kind of high intensity can anodic oxidation pack alloy and preparation method thereof | |
| CN103834836A (en) | Die-casting forging aluminum alloy and production method thereof | |
| CN106148767B (en) | A kind of aluminium alloy and its preparation method and application | |
| CN113151712A (en) | Aluminum alloy and preparation method thereof | |
| CN116676515B (en) | Al-Mn-Zn-Ce die-casting anode alloy and preparation method and application thereof | |
| CN105886857A (en) | Cast aluminum alloy capable of being subjected to anodic oxidation and preparation method thereof | |
| CN113862523A (en) | Al-Mn series die-casting alloy and preparation method and application thereof | |
| CN114438373A (en) | Bright anodized extrusion casting aluminum alloy and preparation method thereof | |
| KR20130010035A (en) | Alloy for die-casting capable of performing anodizing | |
| CN111363960A (en) | Anodized thin-wall die-casting aluminum alloy material, preparation method thereof and thin-wall appearance part | |
| CN103484732A (en) | Alloy material of centrifugal refrigerating compressor impeller and preparation method thereof | |
| CN101446690B (en) | manufacturing method of anodizing casting aluminium alloy spectacle frame with surface decoration | |
| CN110938763B (en) | Preparation method of die-casting aluminum alloy material capable of being anodized and die-casting method | |
| CN111074105A (en) | Anodic-oxidation die-casting aluminum alloy material, preparation method thereof and die-casting method thereof | |
| CN111101025A (en) | Die-casting aluminum alloy, preparation method thereof and aluminum alloy forming body | |
| KR20120048174A (en) | Alloy for die-casting capable of performing anodizing | |
| CN108893664A (en) | A kind of aluminum alloy materials and preparation method | |
| CN104593643A (en) | Die-casting aluminum alloy material formula and production process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200703 |
|
| RJ01 | Rejection of invention patent application after publication |