A kind of anticorrosion aluminum alloy and its preparation method and application

Abstract

The invention belongs to the field of metal material preparation, and discloses a corrosion-resistant aluminum alloy and its preparation method and application, including Mg 0.8-1.2%, Si 0.9-1.3%, Cu 0.1-0.3%, Mn 0.2-0.2% by weight percentage 0.4%, Cr 0.15‑0.35%, Zr 0.1‑0.3%, Hf 0.2‑0.6%, and Fe≤0.5%. The present invention adds trace elements of Hf, Zr and Cr, and adopts a three-stage homogenization process to promote the precipitation of saturated matrix to form highly stable (Al, Cr) 3 (Hf, Zr) phase, inhibit the growth of recrystallized grains, refine the grains, improve the corrosion resistance of the alloy; form high-density (Al, Cr) 3 (Hf, Zr) dispersed phase to further improve the strength of the alloy; by optimizing the content of Mg, Si, Cu elements and the ratio of Mg / Si, Cu Si and vacancies form early aging clusters to promote the dispersion precipitation of strengthening phase and improve aging strengthening Phase (Mg 2 Si) content, to obtain higher strength of the alloy; the present invention also adds an appropriate amount of Cu elements, while avoiding the formation of Q phase, θ equal Cu-containing phase, and can obtain better corrosion resistance. The obtained aluminum alloy is suitable as an aluminum alloy for automobile structural parts or applied in its profiles.

Description

technical field [0001] The invention belongs to the field of metal material preparation, and in particular relates to a corrosion-resistant aluminum alloy and a preparation method and application thereof. Background technique [0002] 6xxx series aluminum alloys (i.e. Al-Mg-Si series alloys), due to their medium to high strength and high formability, have become the preferred materials for the new generation of lightweight vehicles. AA6016, AA6111 and AA6022 alloys are used in the processing of automobile body outer panels, and are widely used in body aluminum alloys. In order to improve the strength of Al-Mg-Si aluminum alloys, the content of Mg, Si, and Cu elements is usually increased, but this not only reduces the plasticity and corrosion resistance of the alloy, but also greatly reduces the processing performance of the alloy. At this time, it is usually necessary to control the content of Mg and Si elements to obtain high formability properties of the alloy. In the p...

AI Technical Summary

Problems solved by technology

Sc element is the most effective rare earth element to inhibit the recrystallization of aluminum alloy, obtain non-recrystallized structure, and form secondary dispersed Al 3 Sc phase improves alloy strength and stress corrosion resistance, but the high cost limits the industrial application of Sc-containing rare earth aluminum alloys

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