7-series aluminum alloy and preparation method thereof

Abstract

The invention relates to 7-series aluminum alloy which is prepared from the following components in percentage by weight: 1.32-1.40 percent of magnesium, 0.014-0.016 percent of titanium, 7.50-7.70 percent of zinc, 0.003-0.005 percent of manganese, no larger than 0.05 percent of silicon, no larger than 0.08 percent of iron, no larger than 0.004 percent of copper, no larger than 0.001 percent of nickel, no larger than 0.001 percent of chromium, smaller than 0.0003 percent of zirconium and the balance of aluminum. The invention also relates to a preparation method for the 7-series aluminum alloy. The 7-series aluminum alloy has the advantages of high tensile strength, high yield strength, high ductility and excellent grain size grade.

Description

technical field [0001] The invention relates to aluminum alloy technology, and its characteristics relate to a 7-series aluminum alloy and a preparation method thereof. Background technique [0002] Aluminum alloys are made by adding some alloying elements to pure aluminum, such as Al-Mn alloys developed by adding manganese elements to pure aluminum, Al-Cu alloys developed by adding copper elements to pure aluminum, and copper added to pure aluminum at the same time. Al-Cu-Mg series hard aluminum alloys were developed with magnesium elements, and Al-Zn-Mg-Cu series superhard aluminum alloys were developed by adding zinc, magnesium, and copper elements to pure aluminum at the same time. Aluminum alloy is characterized by lightness, high strength, good heat dissipation, good hand feeling and easy anodizing and coloring. Under the same strength requirements, aluminum alloy parts can be made thinner and lighter than plastic parts, and at the same time can meet the requirements ...

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Problems solved by technology

[0003] Although the 7-series aluminum alloy is superior to the 6-series aluminum alloy in strength, the tensile strength and yield strength of some alloys can reach more than 400Mpa, but the 7-series aluminum alloy with a tensile strength and yield strength of more than 400Mpa, the surface after anodic oxidation The quality is not as fine as the 6-series wrought aluminum alloy, there are surface defects such as stripes and different colors, and the decorative aesthetics are low

[0005] Although the 7XXX aluminum alloy disclosed in the above-mentioned patent can make the oxide film obtained by anodizing the material more delicate and beautiful to a certain extent, the obtained 7XXX aluminum alloy still has an unstable anodized oxide film, which is prone to stress corrosion, detachment, etc. Membrane and other issues

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