Kairy, S K; Wu, Y; Turk, S; Shekhter, A; Buchheit, R G; Birbilis, N (2025) Clarifying the role of η-phase with varying chemistry on localised corrosion of a Cu-containing 7xxx Al-alloy by quasi-in-situ TEM. Corrosion Science, 253. 113026 ISSN 0010938X

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Abstract

Quasi-in-situ transmission electron microscopy was employed to study dissolution associated with η-phase (Mg(Zn,Al,Cu)2) precipitates in aluminium alloy AA7085. Two distinct η-phase chemistries, with Cu to (Zn+Mg+Al) ratios ~0.12 and ~0.2, were studied in 0.01 M NaCl at pH 6 and 2. In near-neutral NaCl, both η-phase precipitates exhibited ‘duplex’ behaviour, i.e., they were primarily more noble with respect to the surrounding Al-matrix, causing matrix dissolution, and simultaneously established nanoscopic active sites within the noble precipitate itself by generating nanoscale pits. In contrast, η-phase precipitates rapidly dealloyed in acidic NaCl, leaving nanocrystalline Cu remnants containing twins, causing Al-matrix dissolution.

Item Type:	Article
Subjects:	Advanced Materials > Corrosion
Divisions:	Electromagnetic & Electrochemical Technologies
Identification number/DOI:	10.1016/j.corsci.2025.113026
Last Modified:	20 May 2026 14:26
URI:	https://eprintspublications.npl.co.uk/id/eprint/10414