Anode-oxidable high-performance die-casting aluminum alloy and preparation method thereof

Abstract

The invention provides an anode-oxidable high-performance die-casting aluminum alloy and a preparation method thereof. The die-casting aluminum alloy comprises the following components in percentage by weight: 0.5-3.0 percent of Mn, 0.5-2.50 percent of Mg, 0.1-1.0 percent of D and the balance of Al and inevitable impurities, wherein D can be one or more than two of elementary substances Y, Sc and Re; the inevitable impurities comprises the following components in percentage by weight: less than or equal to 0.10 percent of Fe, less than or equal to 0.10 percent of Si and less than or equal to 0.10 percent of Cu. The aluminum alloy is simple in composition, a high-finish surface can be obtained by means of ordinary anode oxidation and dyeing, and the comprehensive physical properties of high strength, high plasticity and the like are achieved; the anode-oxidable high-performance die-casting aluminum alloy can be colored, has high casting performance, machinability and high corrosion resistance, and can meet the use requirements of exterior parts for 3C products. The production cost is reduced, and the efficiency is increased.

Description

technical field [0001] The invention belongs to the field of metal materials. It relates to the technical field of die-casting aluminum alloy materials, and more specifically relates to an anodizable die-casting aluminum alloy and a preparation method thereof. Background technique [0002] As a type of aluminum alloy, die-casting aluminum alloy contains more alloying elements, so it is difficult to perform anodic oxidation and coloring treatment, and it is difficult to form a good and stable film layer. [0003] At present, with the improvement of people's living standards, there are more and more demands for surface decoration and anti-corrosion functions of some aluminum alloy products. In order to adapt to the large-scale production of general decorative parts and appearance parts with certain mechanical properties and good corrosion resistance There is an urgent need in the market for a die-casting aluminum alloy that can be anodized and colored. [0004] At present, t...

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Problems solved by technology

[0005] Al-Si series alloy is currently the most widely used die-casting aluminum alloy. After chemical treatment, the surface becomes gray and black, with poor mechanical properties and high brittleness.

[0006] Al-Mg series alloy die castings can be oxidized and colored, but the die casting performance is poor, and it is easy to form defects such as sticking, hot cracking, insufficient pouring, cold shut, and porosity, and the mechanical properties and surface hardness are not high.

[0007] Although the Al-Zn alloy has high strength, it has the problems of poor casting fluidity and mold filling, and even has a tendency of hot cracking.

[0008] Although the Al-Cu alloy has good fluidity, it has great brittleness, and the product is easily brittle, so it cannot be used in real production.

[0009] In view of the problems existing in the above die-casting aluminum alloys, it is not suitable for die-casting parts with high surface finish and requirements for wear resistance, corrosion resistance, strength, plasticity and die-casting performance.

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