Effects of aging treatment and peripheral coarse grain on the exfoliation corrosion behaviour of 2024 aluminium alloy using SR-CT

Shuangqing Sun; Yi Fang; Le Zhang; Chunling Li; Songqing Hu

Journal of Materials Research and Technology (May 2020)

Effects of aging treatment and peripheral coarse grain on the exfoliation corrosion behaviour of 2024 aluminium alloy using SR-CT

Shuangqing Sun,
Yi Fang,
Le Zhang,
Chunling Li,
Songqing Hu

Affiliations

Shuangqing Sun: School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
Yi Fang: School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
Le Zhang: Science and Technology on Power Beam Processes Laboratory, AVIC Manufacturing Technology Institute, Beijing, 100024, PR China
Chunling Li: School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, PR China; Corresponding authors at: Schools of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
Songqing Hu: School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, PR China; Corresponding authors at: Schools of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, PR China

Journal volume & issue: Vol. 9, no. 3
pp. 3219 – 3229

Abstract

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The exfoliation corrosion behaviour of 2024 aluminium alloy was investigated through exfoliation corrosion test, together with synchrotron radiation X-ray computed tomography (SR-CT) to achieve the 3D segmentation of precipitated phases, cracks and corrosion products. The results demonstrate that aging treatment has a significant effect on the distribution of the precipitated phases in the 2024-T4 aluminium alloy, and the precipitated phases continuously distributed along the grain boundary would lead to intergranular corrosion (IGC) which is easily evolved into exfoliation corrosion. In the 2024-T2 aluminium alloy, the longest crack was found to locate at the boundary between the inner grains structure and outer peripheral coarse grain (PCG) structure, which indicates that the corrosion is attributed to electrochemical property difference of two structures.

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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