A kind of anodized die-casting aluminum alloy and preparation method thereof

Abstract

The invention discloses an anodized die-casting aluminum alloy. The aluminum alloy components and their mass percentages are: Mg 0.2%-1.0%, Zn 1.0%-3.0%, Mn 1.0%-3.0%, Fe 0.2%-0.8 %, Si<0.2%, Ti 0.05%-0.5%, Zr 0.1%-0.5%, and the balance is Al. The preparation method of aluminum alloy comprises the following steps: placing industrial pure Al ingot, pure Zn ingot, Al-Mn master alloy and Fe agent in a smelting furnace for heating; after the raw materials are melted, the smelting furnace is cooled, and then pure Mg and Al- The Zr master alloy is pressed into the smelting furnace until the pure Mg and Al-Zr master alloys are completely melted; the refining agent and the refining agent are added to the smelting furnace and stirred, then degassed, and the slag is removed after standing; the samples after the slag removal are cast, Anodized die-cast aluminum alloy is obtained.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys and casting thereof, in particular to an anodized die-casting aluminum alloy and a preparation method thereof. Background technique [0002] With the improvement of people's living standards, the demand for anodized decorative products is gradually increasing, and the requirements for color and appearance are also gradually diversified. However, at present, anodized aluminum products mainly use aluminum profiles, which have the advantages of long process, waste, and Due to problems such as long CNC time, the production cost cannot be further reduced, so that the aluminum alloy decorative parts do not have a competitive advantage. Die-casting products have the advantages of short process, suitable for mass production, low production cost, and adapt to market-oriented development. However, in order to obtain excellent casting performance, the existing die-casting aluminum alloys mainly conta...

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Problems solved by technology

[0002] With the improvement of people's living standards, the demand for anodized decorative products is gradually increasing, and the requirements for color and appearance are also gradually diversified. However, at present, anodized aluminum products mainly use aluminum profiles, which have the advantages of long process, waste, and Problems such as long CNC time cannot further reduce production costs, making aluminum alloy decorative parts products not competitive.

Die-casting products have the advantages of short process, suitable for mass production, low production cost, and adapt to market-oriented development. However, in order to obtain excellent casting performance, the existing die-casting aluminum alloys mainly contain Si as the main alloying element, and surface cracks will appear after anodic oxidation. gray, discontinuous oxide film, etc., and can only do black anodizing, other colors are difficult to achieve, the existing die-casting aluminum alloy products cannot be used as decorative parts

[0003] New die-casting aluminum alloys, such as Al-Mn series alloys, have good fluidity and mold release properties, but their strength is far lower than that of Al-Si alloys, so it is difficult to apply to decorative and structural parts that require high strength; And Al-Mn alloys are easy to form rhombohedral large-sized Al 6 Mn phase, rhombohedral large size Al 6 The Mn phase is easy to form stress concentration, which reduces the mechanical properties of the casting, and the Al 6 The larger the size of the Mn phase, the larger the potential difference with the substrate, and the easier it is to affect the uniformity and continuity of the oxide film during anodic oxidation. The ordinary Al-Mn alloys will form large-sized Al 6 Mn phase, which leads to a decrease in the mechanical properties and anodic oxidation properties of the alloy, and cannot be applied to products with high requirements on appearance and mechanical properties

There are studies to refine Al 6 The second phase of Mn, adding a large amount of elements such as rare earth and Sc to the alloy can refine the second phase to a certain extent, but it will lead to a sharp increase in the production cost of the alloy, making it difficult to apply to industrial production.

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