CN112853178B - Anodic oxidation die-casting aluminum alloy and preparation method thereof - Google Patents

Anodic oxidation die-casting aluminum alloy and preparation method thereof Download PDF

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CN112853178B
CN112853178B CN202011620522.3A CN202011620522A CN112853178B CN 112853178 B CN112853178 B CN 112853178B CN 202011620522 A CN202011620522 A CN 202011620522A CN 112853178 B CN112853178 B CN 112853178B
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CN112853178A (en
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贵星卉
李虎田
钟鼓
林师朋
高崇
王占坤
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Chinalco Materials Application Research Institute Co Ltd
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    • 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
    • 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

Abstract

The invention discloses an anodic oxidation die-casting aluminum alloy, which comprises the following components in percentage by mass: 0.2 to 1.0 percent of Mg, 1.0 to 3.0 percent of Zn, 1.0 to 3.0 percent of Mn, 0.2 to 0.8 percent of Fe, less than 0.2 percent of Si, 0.05 to 0.5 percent of Ti, 0.1 to 0.5 percent of Zr and the balance of Al. The preparation method of the aluminum alloy comprises the following steps: placing an industrial pure Al ingot, a pure Zn ingot, an Al-Mn intermediate alloy and an Fe agent in a smelting furnace for heating, cooling the smelting furnace after the raw materials are melted, and pressing the pure Mg and the Al-Zr intermediate alloy into the smelting furnace until the pure Mg and the Al-Zr intermediate alloy are completely melted; adding a refining agent and a refiner into the smelting furnace, stirring, degassing, standing and slagging off; and casting the slag-removed sample to obtain the anodic oxidation die-casting aluminum alloy.

Description

Anodic oxidation die-casting aluminum alloy and preparation method thereof
Technical Field
The invention belongs to the technical field of aluminum alloy and casting thereof, and particularly relates to an anodic oxidation die-casting aluminum alloy and a preparation method thereof.
Background
Along with the improvement of people's standard of living, demand to anodic oxidation decoration product is crescent, also diversifies gradually to the requirement of colour and outward appearance, but at present anodic oxidation aluminium alloy goods mainly use the aluminium alloy, has that the procedure is long, extravagant many, the long scheduling problem of CNC time, can't further reduction in production cost for aluminum alloy decoration product does not have competitive advantage. The die-casting product has the advantages of short flow, suitability for mass production, low production cost and suitability for market development, but in order to obtain excellent casting performance, the existing die-casting aluminum alloy mainly takes Si as a main alloy element, the problems of surface graying, discontinuous oxide film and the like can occur after anodic oxidation, the existing die-casting aluminum alloy product can only be subjected to black anodic oxidation, other colors are difficult to realize, and the existing die-casting aluminum alloy product cannot be used as a decoration.
Novel die-casting aluminum alloy, such as Al-Mn alloy, has better fluidity and demolding property, but the strength of the novel die-casting aluminum alloy is far lower than that of Al-Si alloy, and the novel die-casting aluminum alloy is difficult to be applied to decorating parts and structural parts with higher requirements on strength; and the Al-Mn alloy is easy to form diamond large-size Al6Mn phase, rhombohedral large size Al6Mn is compatible and easily forms stress concentration, reduces the mechanical property of castings, and Al6The larger the size of Mn phase, the larger the potential difference with the substrate, and the more easily the uniformity and continuity of the oxide film are affected during the anodic oxidation process, and the common Al-Mn series alloy can form large-sized Al due to the large-sized Al6The Mn phase causes the reduction of the mechanical property and the anodic oxidation property of the alloy, and can not be applied to products with higher requirements on the appearance and the mechanical property. Is studied to refine Al6The second phase of Mn can be refined to a certain extent by adding a large amount of elements such as rare earth and Sc into the alloy, but the production cost of the alloy is increased sharply, and the application to industrial production is difficult.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the alloy with higher strength and die-casting performance, the alloy can form a uniform and continuous oxide film after anodic oxidation, the color difference value delta E of the surface of the oxide film is less than 0.2, the dyeing is convenient, the alloy does not contain elements with higher price such as Sc, rare earth and the like, and the production cost is lower.
The invention adopts the following technical scheme:
an anodic oxidation die-casting aluminum alloy is characterized by comprising the following components in percentage by mass: 0.2 to 1.0 percent of Mg, 1.0 to 3.0 percent of Zn, 1.0 to 3.0 percent of Mn, 0.2 to 0.8 percent of Fe, less than 0.2 percent of Si, 0.05 to 0.5 percent of Ti, 0.1 to 0.5 percent of Zr and the balance of Al; wherein the mass ratio of Zn to Mg is 2.5-3.5, the mass ratio of Mn to Fe is more than 3, and the mass percentage content of all impurities including Si is less than or equal to 0.3%; the area ratio of the second phase of the cast ingot structure of the aluminum alloy is less than 5.5%, and the size of the second phase of the cast ingot structure of the aluminum alloy is less than 100 mu m.
The anodic oxidation die-casting aluminum alloy is characterized by comprising the following components in percentage by mass: 0.3 to 0.7 percent of Mg, 1.5 to 2.4 percent of Zn, 1.6 to 2.3 percent of Mn, 0.3 to 0.5 percent of Fe, less than 0.15 percent of Si, 0.1 to 0.2 percent of Ti, 0.1 to 0.3 percent of Zr and the balance of Al; wherein the mass ratio of Zn to Mg is 2.6-2.9, the mass ratio of Mn to Fe is more than 6, and the mass percentage content of all impurities including Si is less than or equal to 0.2%.
The anodized die-cast aluminum alloy is characterized in that the cooling rate of a cast part of the aluminum alloy during the die-casting process is greater than 30 ℃/s.
The preparation method of the anodic oxidation die-casting aluminum alloy is characterized by comprising the following steps of:
(1) placing raw materials of an industrial pure Al ingot, an industrial pure Zn ingot, an Al-Mn intermediate alloy and an Fe agent in a smelting furnace, heating to 780-800 ℃, cooling the smelting furnace to 760-770 ℃ after the raw materials in the smelting furnace are melted, and pressing pure Mg and the Al-Zr intermediate alloy into the smelting furnace until the pure Mg and the Al-Zr intermediate alloy are completely melted to obtain a melted material;
(2) adding a refining agent and a refiner into the smelting furnace, stirring and degassing for 15-20 min, standing for 15-20 min, and skimming to obtain a skimmed sample;
(3) when the temperature of the slag-removed sample reaches 720-740 ℃, casting to obtain an anodic oxidation die-casting aluminum alloy; the temperature of the casting mould is 180-220 ℃.
The preparation method of the anodic oxidation die-casting aluminum alloy is characterized in that the adding amount of the refining agent in the step (2) is 2-5 per mill of the sum of the mass of the industrial pure Al ingot, the mass of the industrial pure Zn ingot, the mass of the Al-Mn intermediate alloy, the mass of the Fe agent, the mass of the pure Mg and the mass of the Al-Zr intermediate alloy in the step (1); the addition amount of the refiner is 3-5 per mill of the sum of the mass of the industrial pure Al ingot, the mass of the industrial pure Zn ingot, the mass of the Al-Mn intermediate alloy, the mass of the Fe agent, the mass of the pure Mg and the mass of the Al-Zr intermediate alloy in the step (1).
The preparation method of the anodic oxidation die-casting aluminum alloy is characterized in that in the step (2), the refining agent is a blocky or granular sodium-free refining agent, and the refining agent is Al-Ti-B.
The invention has the beneficial technical effects that: the anodic oxidation die-casting aluminum alloy of the invention is added with Zn, Mg, Mn and Fe elements, thereby not only improving the solid solution strengthening effect of the alloy, but also converting the Mn-containing phase into a fine dispersed second phase, reducing the color difference between the matrix and the second phase, effectively improving the anodic oxidation performance of the alloy and simultaneously improving the mechanical property. The anodic oxidation die-casting aluminum alloy has good mechanical property, die-casting property and extremely high anodic oxidation effect, can form an even and continuous oxidation film with the color difference value delta E smaller than 0.2 after anodic oxidation, has the thickness of the oxidation film layer larger than 10um, is simple in anodic oxidation process, is easy to dye a finished product, does not add elements with higher price such as Sc and rare earth, only adds a small amount of Zr element, has the advantage of low production cost, and can be applied to shell type structural members and decorative members with higher requirements on appearance and mechanical property. In the die-casting process of the anodic oxidation die-casting aluminum alloy, the cooling rate of the casting is more than 30 ℃/s, which is beneficial to forming fine grain structures and fine dispersed second phases on the surface, is beneficial to reducing the anodic oxidation color difference value, and improves the anodic oxidation performance. The method is simple to operate and easy for large-scale production.
Drawings
FIG. 1 is a metallographic image of the microstructure of an anodized die-cast aluminum alloy ingot of example 3;
FIG. 2 is a metallographic image of the microstructure of an aluminum alloy ingot of comparative example 1.
Detailed Description
The invention relates to an anodic oxidation die-casting aluminum alloy which comprises the following components in percentage by mass: 0.2 to 1.0 percent of Mg, 1.0 to 3.0 percent of Zn, 1.0 to 3.0 percent of Mn, 0.2 to 0.8 percent of Fe, less than 0.2 percent of Si, 0.05 to 0.5 percent of Ti, 0.1 to 0.5 percent of Zr and the balance of Al; wherein the mass ratio of Zn to Mg is 2.5-3.5, the mass ratio of Mn to Fe is more than 3, and the mass percentage content of all impurities including Si is less than or equal to 0.3%. Preferably, the anodic oxidation die-casting aluminum alloy comprises the following components in percentage by mass: 0.3 to 0.7 percent of Mg, 1.5 to 2.4 percent of Zn, 1.6 to 2.3 percent of Mn, 0.3 to 0.5 percent of Fe, less than 0.15 percent of Si, 0.1 to 0.2 percent of Ti, 0.1 to 0.3 percent of Zr and the balance of Al; wherein the mass ratio of Zn to Mg is 2.6-2.9, the mass ratio of Mn to Fe is more than 6, and the mass percentage content of all impurities including Si is less than or equal to 0.2%. The cooling rate of the cast of the aluminum alloy ingot in the die casting process is more than 30 ℃/s. The area ratio of the second phase of the ingot structure of the aluminum alloy is less than 5.5%, and the maximum size of the second phase of the ingot structure of the aluminum alloy is less than 100 mu m. By controlling the area ratio and the size of the second phase of the alloy, the chromatic aberration of the second phase and the matrix is reduced, and the uniform chromatic aberration of the alloy after anodic oxidation is ensured.
The preparation method of the anodic oxidation die-casting aluminum alloy comprises the following steps:
(1) placing raw materials of an industrial pure Al ingot, an industrial pure Zn ingot, an Al-Mn intermediate alloy and an Fe agent in a smelting furnace, heating to 780-800 ℃, cooling the smelting furnace to 760-770 ℃ after the raw materials in the smelting furnace are melted, and pressing pure Mg and the Al-Zr intermediate alloy into the bottom of a furnace body of the smelting furnace until the pure Mg and the Al-Zr intermediate alloy are completely melted to obtain a melted material.
(2) Adding a refining agent and a refiner into the smelting furnace, stirring and degassing for 15-20 min, standing for 15-20 min, and skimming to obtain a skimmed sample; the refining agent is a blocky or granular sodium-free refining agent, and the refiner is Al-Ti-B. The adding amount of the refining agent is 2-5 per mill of the sum of the mass of the industrial pure Al ingot, the mass of the industrial pure Zn ingot, the mass of the Al-Mn intermediate alloy, the mass of the Fe agent, the mass of the pure Mg and the mass of the Al-Zr intermediate alloy in the step (1); the addition amount of the refiner is 3-5 per mill of the sum of the mass of the industrial pure Al ingot, the mass of the industrial pure Zn ingot, the mass of the Al-Mn intermediate alloy, the mass of the Fe agent, the mass of the pure Mg and the mass of the Al-Zr intermediate alloy in the step (1).
(3) When the temperature of the sample after slagging off reaches 720-740 ℃, casting to obtain an anodic oxidation die-casting aluminum alloy; the temperature of the casting mould is 180-220 ℃.
The anodic oxidation die-casting aluminum alloy material provided by the invention optimizes the chemical components and proportion by adding proper amount of Mn, Zn, Mg and Fe into the aluminum alloyTi and Zr, so that the alloy obtains a fine and uniformly distributed second phase structure, thereby having good die casting performance, anodic oxidation performance and mechanical property. Wherein, the mass percentage content of Zn element is controlled to be 1.0-3.0%, the mass percentage content of Mg element is controlled to be 0.2-1.0%, the cooling rate in the die-casting process is more than 30 ℃/s, Zn and Mg can be completely dissolved in the matrix under the die-casting condition to play a role of solid solution strengthening, and meanwhile, the mass ratio of Zn to Mg can be controlled to promote the diamond large-size Al6Mn phase is converted into fine dispersed spherical Al85(Mn0.72,Fe0.28)14The Si phase is beneficial to improving the mechanical property and the anodic oxidation effect; the solid solubility of Zn and Mg elements in Al matrix is high, and MgZn can not be separated out in the die-casting process2Therefore, the strengthening effect of Zn and Mg elements is mainly shown in that Zn and Mg atoms are dissolved in an Al matrix, the solid solution strengthening effect of the alloy is improved, and the strength of the alloy is obviously improved. The mass ratio of Zn to Mg is controlled within the range of 2.5-3.5, Zn and Mg atoms which are dissolved in a matrix can promote the transformation of Mn-containing phase in the die-casting process, so that the precipitated rhombus large-size Al6Mn phase transformation into spherical small-size Al85(Mn0.72,Fe0.28)14A Si phase; meanwhile, Zn and Mg elements added in proportion can effectively reduce the vacancy concentration in the matrix, limit the vacancy movement and slow down Al85(Mn0.72,Fe0.28)14Growth of Si phase to precipitate Al85(Mn0.72,Fe0.28)14The Si phase is more finely dispersed, the area ratio of the second phase in the ingot casting structure is controlled to be below 5.5 percent by regulating and controlling the casting process, and the maximum size of the second phase<100 mu m, the alloy is not easy to generate diamond-shaped large-size second phases in the die casting process, and the second phases in the die casting are distributed more finely and uniformly, so that the potential difference between the second phases and a matrix in the die casting is reduced, the produced oxide film is more uniform and continuous, the color difference value is lower, the anodic oxidation performance is improved, and the deterioration of the large-size second phases on the mechanical property of the alloy is reduced. The addition of Mn element can replace Si and Fe elements, so that the alloy still has better fluidity, and the content of Mn element is controlled at eutectic pointNearby, the fluidity of the alloy is ensured, the precipitation of Mn-containing phases is reduced, and the anodic oxidation performance is ensured; the addition of Fe element is beneficial to improving the demoulding performance on one hand, and on the other hand, the content of Mn/Fe ratio is controlled, so that an Al-Mn-Fe phase can be formed under the modification action of Mn element, the deterioration action of the relative mechanical property and anode oxidation property of needle-shaped Al-Fe is reduced, and meanwhile, under the promotion action of Zn and Mg element, the Al-Mn-Fe phase is converted into small-size Al85(Mn0.72,Fe0.28)14The Si phase is beneficial to improving the mechanical property and the oxidizing property of the anode; when the mass ratio of Mn to Fe is more than 3, on one hand, the addition of a proper amount of Fe element is beneficial to improving the mold release property, on the other hand, the excessive Mn element can fully modify the Fe-containing phase, reduce the needle-shaped Fe-containing phase which is easy to deteriorate the mechanical property and the anode oxidation property and separate out, and simultaneously, a certain amount of Fe element is beneficial to Al6Mn is oppositely fine Al85(Mn0.72,Fe0.28)14Transformation of the Si phase. Adding Zr 0.1-0.5% to the alloy can generate Al with fine dispersion3The Zr phase plays a role in pinning a grain boundary, so that the growth of crystal grains is hindered, the crystal grains of the die-casting aluminum alloy are refined, and the anodic oxidation performance is improved. The addition of Ti is beneficial to grain refinement, and can improve the flow property and the anodic oxidation property of the alloy. The invention reduces the generation of impurity phase in the alloy and ensures the uniformity and continuity of the anodic oxide film by controlling the content of total impurities in the alloy to be less than or equal to 0.3 percent. According to the anodic oxidation die-casting aluminum alloy material provided by the invention, on one hand, Mn, Zn and Mg with high solid solubility are selected, so that the solid solution strengthening effect is fully embodied; on the other hand, by using the reasonable proportion of Zn, Mg, Mn and Fe, the rhombic and acicular large-size second phases are converted into spherical and rodlike fine second phases, so that the adverse effect on anodic oxidation is reduced; meanwhile, the addition of Ti and Zr refines the grain structure, so that the color of the anodic oxide film is more uniform and easier to dye. In the invention, Zr element can generate fine and dispersed Al under the condition of high temperature3The Zr phase can pin the grain boundary and block the growth of crystal grains, thereby refining the crystal grains and playing a role in improving the oxidizing property of the anode.
The present invention will be described in detail below with reference to examples and comparative examples.
Example 1
Placing raw materials of an industrial pure Al ingot, an industrial pure Zn ingot, an Al-Mn intermediate alloy and an Fe agent in a smelting furnace, heating to 800 ℃, cooling the smelting furnace to 760 ℃ after the raw materials in the smelting furnace are melted, and pressing pure Mg and the Al-Zr intermediate alloy into the bottom of the furnace body of the smelting furnace until the pure Mg and the Al-Zr intermediate alloy are completely melted to obtain a melted material.
And adding a sodium-free refining agent and an Al-Ti-B refiner into the smelting furnace, stirring and degassing for 15min, standing for 15min after degassing is finished, and slagging off to obtain a slagging-off sample. The addition amount of the sodium-free refining agent is 2 per mill of the mass of the raw materials, and the addition amount of the Al-Ti-B refiner is 3 per mill of the mass of the raw materials.
And when the temperature of the sample after slagging off reaches 740 ℃, casting to obtain an anodic oxidation die-casting aluminum alloy ingot, wherein the temperature of a casting mold is 200 ℃, and the anodic oxidation die-casting aluminum alloy comprises the following components in percentage by mass: 0.7% of Mg, 1.8% of Zn, 1.8% of Mn, 0.5% of Fe, 0.1% of Ti, 0.2% of Zr and the balance of Al.
Example 2
Placing an industrial pure Al ingot, an industrial pure Zn ingot, an Al-Mn intermediate alloy and an Fe agent in a smelting furnace, heating to 800 ℃, cooling the smelting furnace to 760 ℃ after raw materials in the smelting furnace are melted, and pressing a pure Mg and Al-Zr intermediate alloy into the bottom of a furnace body of the smelting furnace until the pure Mg and the Al-Zr intermediate alloy are completely melted to obtain a melted material.
And adding a sodium-free refining agent and an Al-Ti-B refiner into the smelting furnace, stirring and degassing for 15min, standing for 15min after degassing is finished, and slagging off to obtain a slagging-off sample. The addition amount of the sodium-free refining agent is 3 per mill of the mass of the raw materials, and the addition amount of the Al-Ti-B refiner is 3 per mill of the mass of the raw materials.
And when the temperature of the sample after slagging off reaches 740 ℃, casting to obtain an anodic oxidation die-casting aluminum alloy ingot, wherein the temperature of a casting mold is 200 ℃, and the anodic oxidation die-casting aluminum alloy comprises the following components in percentage by mass: 0.4% of Mg, 1.4% of Zn, 1.8% of Mn, 0.5% of Fe, 0.1% of Ti, 0.3% of Zr and the balance of Al.
Example 3
Placing an industrial pure Al ingot, an industrial pure Zn ingot, an Al-Mn intermediate alloy and an Fe agent in a smelting furnace, heating to 800 ℃, cooling the smelting furnace to 760 ℃ after raw materials in the smelting furnace are melted, and pressing a pure Mg and Al-Zr intermediate alloy into the bottom of a furnace body of the smelting furnace until the pure Mg and the Al-Zr intermediate alloy are completely melted to obtain a melted material.
And adding a sodium-free refining agent and an Al-Ti-B refiner into the smelting furnace, stirring and degassing for 15min, standing for 15min after degassing is finished, and slagging off to obtain a slagging-off sample. The addition amount of the sodium-free refining agent is 3 per mill of the mass of the raw materials, and the addition amount of the Al-Ti-B refiner is 3 per mill of the mass of the raw materials.
When the temperature of the sample after slagging off reaches 740 ℃, casting to obtain an anodic oxidation die-casting aluminum alloy ingot, wherein the temperature of a casting mold is 200 ℃, and the anodic oxidation die-casting aluminum alloy comprises the following components in percentage by mass: 0.7% of Mg, 2.4% of Zn, 1.8% of Mn, 0.5% of Fe0.1% of Ti, 0.3% of Zr and the balance of Al. FIG. 1 is a gold phase diagram of the microstructure of an anodized die cast aluminum alloy ingot of example 3.
Example 4
Placing an industrial pure Al ingot, an industrial pure Zn ingot, an Al-Mn intermediate alloy and an Fe agent in a smelting furnace, heating to 800 ℃, cooling the smelting furnace to 760 ℃ after raw materials in the smelting furnace are melted, and pressing a pure Mg and Al-Zr intermediate alloy into the bottom of a furnace body of the smelting furnace until the pure Mg and the Al-Zr intermediate alloy are completely melted to obtain a melted material.
And adding a sodium-free refining agent and an Al-Ti-B refiner into the smelting furnace, stirring and degassing for 15min, standing for 15min after degassing is finished, and slagging off to obtain a slagging-off sample. The addition amount of the sodium-free refining agent is 3 per mill of the mass of the raw materials, and the addition amount of the Al-Ti-B refiner is 3 per mill of the mass of the raw materials.
When the temperature of the sample after slagging off reaches 740 ℃, casting to obtain an anodic oxidation die-casting aluminum alloy ingot, wherein the temperature of a casting mold is 200 ℃, and the anodic oxidation die-casting aluminum alloy comprises the following components in percentage by mass: 0.7% of Mg, 1.8% of Zn, 2.2% of Mn, 0.7% of Fe0.1% of Ti, 0.3% of Zr and the balance of Al.
Comparative example 1
Placing an industrial pure Al ingot, an Al-Mn intermediate alloy and an Fe agent in a smelting furnace, heating to 800 ℃, cooling the smelting furnace to 760 ℃ after raw materials in the smelting furnace are melted, pressing the Al-Zr intermediate alloy into the bottom of the furnace body of the smelting furnace until the Al-Zr intermediate alloy is completely melted, and obtaining a melted material.
And adding a sodium-free refining agent and an Al-Ti-B refiner into the smelting furnace, stirring and degassing for 15min, standing for 15min after degassing is finished, and slagging off to obtain a slagging-off sample. The addition amount of the sodium-free refining agent is 3 per mill of the mass of the raw materials, and the addition amount of the Al-Ti-B refiner is 3 per mill of the mass of the raw materials.
When the temperature of the sample after slagging off reaches 740 ℃, casting, wherein the temperature of a casting mold is 200 ℃, and the anodized die-cast aluminum alloy is obtained after casting, and comprises the following components in percentage by mass: 1.8% of Mn, 0.5% of Fe, 0.1% of Ti, 0.3% of Zr and the balance of Al. FIG. 2 is a metallographic image of the microstructure of an aluminum alloy ingot of comparative example 1.
The measured performance data for the alloys of examples 1-4 and comparative example 1 are shown in Table 1.
TABLE 1 measured Performance data for the alloys of examples 1-4 and comparative example 1
Figure BDA0002878212960000061
As is clear from Table 1, the alloy of comparative example 1 is excellent in die casting performance, but is low in alloy strength, high in the area occupation ratio of the second phase in the ingot structure, and large in the size of the second phase, and causes large surface color difference of the anode, and DeltaE > 0.2, and is not qualified. The alloy of the embodiment 1-4 has high strength and excellent die casting performance, good anodic oxidation effect, uniform and continuous oxidation film, small color difference value, delta E less than 0.2, easy dyeing, no addition of elements with high price such as Sc and rare earth, only addition of a small amount of Zr element, low production cost and the like, and can be used for shell structural members and decorative parts with high requirements on strength and appearance.

Claims (5)

1. An anodic oxidation die-casting aluminum alloy is characterized by comprising the following components in percentage by mass: 0.3 to 0.7 percent of Mg0.5 to 3.0 percent of Zn, 1.6 to 2.3 percent of Mn, 0.3 to 0.5 percent of Fe, less than 0.15 percent of Si, 0.1 to 0.2 percent of Ti, 0.1 to 0.3 percent of Zrl and the balance of Al; wherein the mass ratio of Zn to Mg is 2.6-2.9, the mass ratio of Mn to Fe is more than 6, and the mass percentage content of all impurities including Si is less than or equal to 0.2%; the area ratio of the second phase of the cast ingot structure of the aluminum alloy is less than 5.5%, and the size of the second phase of the cast ingot structure of the aluminum alloy is less than 100 mu m.
2. The anodized die cast aluminum alloy of claim 1, wherein an ingot of the aluminum alloy has a cooling rate of greater than 30 ℃/s of the casting during die casting.
3. A method for producing an anodized die-cast aluminum alloy according to claim 1, comprising the steps of:
(1) placing raw materials of an industrial pure Al ingot, an industrial pure Zn ingot, an Al-Mn intermediate alloy and an Fe agent in a smelting furnace, heating to 780-800 ℃, cooling the smelting furnace to 760-770 ℃ after the raw materials in the smelting furnace are melted, and pressing pure Mg and the Al-Zr intermediate alloy into the smelting furnace until the pure Mg and the Al-Zr intermediate alloy are completely melted to obtain a melted material;
(2) adding a refining agent and a refiner into the smelting furnace, stirring and degassing for 15-20 min, standing for 15-20 min, and skimming to obtain a skimmed sample;
(3) when the temperature of the slag-removed sample reaches 720-740 ℃, casting to obtain an anodic oxidation die-casting aluminum alloy; the temperature of the casting mould is 180-220 ℃.
4. The method for producing an anodized die-cast aluminum alloy according to claim 3, wherein the refining agent is added in the step (2) in an amount of 2 to 5% o of the sum of the mass of the industrially pure Al ingot, the mass of the industrially pure Zn ingot, the mass of the Al-Mn intermediate alloy, the mass of the Fe agent, the mass of the pure Mg, and the mass of the Al-Zr intermediate alloy in the step (1); the addition amount of the refiner is 3-5 per mill of the sum of the mass of the industrial pure Al ingot, the mass of the industrial pure Zn ingot, the mass of the Al-Mn intermediate alloy, the mass of the Fe agent, the mass of the pure Mg and the mass of the Al-Zr intermediate alloy in the step (1).
5. The method of producing an anodized die-cast aluminum alloy according to claim 3, wherein the refining agent in the step (2) is a lump or granular sodium-free refining agent, and the refining agent is Al-Ti-B.
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CN115522104B (en) * 2021-11-23 2023-03-31 中铝材料应用研究院有限公司 Anodic oxidation die-casting aluminum alloy and preparation method thereof
CN114959383B (en) * 2022-04-18 2023-09-19 聊城市金之桥进出口有限公司 Al-based ternary heat-resistant motor rotor alloy and preparation method and application thereof
CN117144199B (en) * 2023-09-06 2024-04-02 佛山市营鑫新材料有限公司 High-strength high-fluidity anodic oxidation Al-Mn series die casting alloy and preparation method thereof
CN117107132A (en) * 2023-10-23 2023-11-24 华劲新材料研究院(广州)有限公司 Die-casting aluminum alloy capable of being anodized and application thereof

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