An ultra-high-strength corrosion-resistant extrudable 6-series aluminum alloy and a method for preparing the same, and a hollow aluminum alloy profile

By adjusting the content of elements such as Mg, Si, and Cu, and adding Zn, combined with online quenching and aging treatment, the problem of insufficient strength and corrosion resistance of 6xxx aluminum alloy in hollow profiles was solved, realizing aluminum alloy profiles with high strength, high corrosion resistance and good extrudability, expanding the application range and improving production efficiency.

CN117363933BActive Publication Date: 2026-06-09NINGBO XINTAI MACHINERY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO XINTAI MACHINERY
Filing Date
2023-08-28
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Existing 6xxx aluminum alloys have shortcomings in terms of improving strength and corrosion resistance, especially in the application of cavity profiles, where they exhibit problems such as slow extrusion speed, easy cracking, and low production efficiency.

Method used

By controlling the content and ratio of elements such as Mg, Si, and Cu, and adding Zn, combined with online quenching and aging treatment processes, ultra-high strength and corrosion-resistant extrudable 6-series aluminum alloys are prepared. The Zn content is controlled at 0.75-3.0%, preferably 0.80-2.0%, to form a fine and dense Mg2Si phase, thereby improving strength and extrudability.

Benefits of technology

It achieves yield strength >370MPa, tensile strength >370MPa, elongation ≥10%, and intergranular corrosion depth <200μm, improving production efficiency and the application range of profiles, and is suitable for aluminum alloy profiles with cavity structures.

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Abstract

The present application relates to a kind of superhigh-strength corrosion-resistant extrudable 6 series aluminum alloy and its preparation method, with cavity aluminum alloy profile, belong to aluminum alloy technical field.The present application discloses a kind of superhigh-strength corrosion-resistant extrudable 6 series aluminum alloy, component is by percentage, including: Mg: 0.70-1.10%;Si: 0.70-1.10%;Cu: ≤0.80%;Mn: <0.40%;Cr: ≤0.30%;Zr: ≤0.20%;Zn: 0.75-3.0%;Fe: ≤0.35%;The sum of unavoidable impurities ≤0.20%;Balance is Al.The present application further discloses a kind of preparation method of superhigh-strength corrosion-resistant extrudable 6 series aluminum alloy and cavity aluminum alloy profile.The tensile strength of superhigh-strength corrosion-resistant extrudable 6 series aluminum alloy / cavity aluminum alloy profile is >375MPa, yield strength is >370MPa, elongation is ≥10%;Intergranular corrosion depth is <200 μm.
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