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Influence of large amount Zn on mechanical properties and corrosion resistance of 5083 hot rolled aluminum alloy Xiaojing Xu1   · Xiaopeng Jin1 · Zheng Liu1 · Bin Zhang1 · Rikai Zhang1 · Yuan Zhuang1 · Peng Zhang1 · Hongbo Wei1 Received: 8 May 2020 / Accepted: 11 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020

Abstract The influence of three kinds of alloy adding 0.3–1.8 wt% Zn on the mechanical properties and corrosion resistance of medium Mg content 4.0–4.5 wt% (5083 type) hot rolled alloy was investigated. The results showed that the addition of Zn content could further dissolve the second phases into the matrix. The hardness and tensile strength were reduced when annealing at 250 °C × 2 h. The mechanical behavior of the alloys showed a tendency that increases first and then decreases and the peak reached its maximum when 1.6 wt% Zn is added at both annealed and unannealed states. Through quantitative analysis, the improvement of mechanical properties mainly comes from dislocation strengthening and Al–Mg–Zn ternary strengthening phases. Meanwhile, with the increase of Zn content, the intergranular corrosion (IGC) of the alloy improved greatly after annealing at 250 °C × 2 h. The electrochemical corrosion potential (ECP) of the alloys increased first and then decreased. Keywords  Zn alloying degree · 5083 aluminum alloy · Dislocation strengthening · Corrosion resistance

1 Introduction Aluminum alloy has been put forward more and higher requirements to different modern industrial fields, such as aerospace equipment and rail transit [1, 2]. However, the overall preparation technology of aluminum alloy materials still need to be continuously improved. As a green environmental protection material, aluminum alloy material can not only be recycled twice and reduce the energy consumption of production [3], but also have better corrosion resistant and processing performance than steel material under the premise of ensuring the safety and function of automobile [4]. Because of the better corrosion resistance than other series aluminum alloy, the 5000 series aluminum alloy is often used to make marine ship shell, aircraft outer skin and other equipment in bad corrosion environment [5, 6]. With the development of industry, the strength requirement of 5000 series aluminum alloy is higher and higher. Compared with the 5083 alloy, the 5383 alloy developed in 1995 only increased the Zn content to 0.4 wt%, and the * Xiaojing Xu [email protected] 1



Engineering Institute of Advanced Manufacturing and Modern Equipment Technology, Jiangsu University, Zhenjiang 212013, China

cutting, forming and welding properties of the alloy are consistent with 5083, while the impact resistance is increased by 10% [7]. The 5059 alloy developed in 1999 continued to add elemental Mg and Zn content based on the composition of the 5383 alloy, the elongation reaches 10% and the strength of the alloy increase by 26% at the same time compared with 5083 alloy [8]. Ma et al. [9] have studied the addition of Zn elements in 5xx