High-strength anodizing die-casting aluminium alloy and preparation method thereof

Abstract

The invention belongs to the technical field of aluminium alloy and particularly relates to high-strength anodizing die-casting aluminium alloy and a preparation method thereof. Mg, Mn, Fe, Zn, Mo, Zr, Cr and Al constitute die-casting alloy elements, and the high-strength anodizing die-casting aluminium alloy is prepared by a smelting procedure and a die-casting procedure. The types, the contents and the adding modes of all the alloy elements are strictly controlled, so that lots of the elements mainly exist in a matrix in a solid solution format under the die-casting (fast cooling) condition; Zr and Mo ensure more uniform alloy tissue and refined crystal grains, so that the alloy has high strength and favorable die-casing performance and excellent anodizing performance; on a die-casting machine, die-casting molding can be performed by a die to directly obtain the required product without heat treatment or deformation, so that the production cost is greatly lowered; and the high-strength anodizing die-casting aluminium alloy is suitable for thin-walled shell members demanding much on the strength, the die-casting performance and the anodizing demand of the aluminium alloy.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a high-strength anodic oxidizable die-casting aluminum alloy and a preparation method thereof. Background technique [0002] The surface of aluminum and its alloys is easy to form an extremely thin layer of amorphous aluminum oxide film, which makes the surface of aluminum parts lose their original gloss. In addition, the oxide film is loose, porous and easily stained. Therefore, aluminum and its alloy products usually need to be anodized. [0003] At present, there are also a large number of anodizable aluminum alloy structural parts available on the market, but the process uses aluminum plates to complete the product processing through a large number of CNC equipment, the processing cost is relatively high, the production efficiency is very low, and the production cost is high. At the same time, raw materials A lot of waste, not environmentally friendly. ...

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Problems solved by technology

[0003] At present, there are also a large number of anodizable aluminum alloy structural parts available on the market, but the process uses aluminum plates to complete the product processing through a large number of CNC equipment, the processing cost is relatively high, the production efficiency is very low, and the production cost is high. At the same time, raw materials A lot of waste, not environmentally friendly

Although the production cost of die-casting parts is low and the efficiency is high, the anodic oxidation effect of ordinary aluminum alloys for die-casting is extremely poor. From the perspective of good casting performance and mechanical properties, die-casting aluminum alloys are represented by Al-Si-Cu alloys (ADC12) The amount of die-casting aluminum alloy is the largest, but due to the influence of Si and Cu on ADC10 and ADC12 alloys, it is difficult to obtain a uniform anodic oxidation film

At present, the high-strength anodizable die-casting aluminum alloy represented by ADC6 in the market has irregular color and poor brightness, and its fluidity and die-casting performance are poor, so it cannot be used for the production of thin-walled and complex structural parts in die-casting technology.

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