Two years pitting corrosion of AA5005-H34 aluminium alloy immersed in natural seawater: morphology characterisation

Title: Two years pitting corrosion of AA5005-H34 aluminium alloy immersed in natural seawater: morphology characterisation
Creator: Liang, Mengxia; Melchers, Robert
Relation: ARC.DP14010338
Relation: Corrosion Engineering Science and Technology Vol. 55, Issue 8, p. 696-707
Publisher Link: http://dx.doi.org/10.1080/1478422X.2020.1777363
Publisher: Taylor & Francis
Resource Type: journal article
Date: 2020
Description: Pitting corrosion of aluminium alloy AA5005-H34 immersed in natural sea water for up to 2 years is presented, together with new interpretations of the development of the pitting process over extended exposure periods. Trenching initiated at surface-located Fe-rich intermetallic (IM) particles. It occurred more extensively in sea water compared to atmospheric exposures. With increasing exposures, the pitting morphologies became more complex. Three types, i.e. hemispherical pits (Type 1), crystallographic pits (Type 2) and characteristic ‘petal’-like pits (Type 3), were observed after 12 months. It is suggested that the formation of Type 2 and Type 3 pits occurs at an advanced corrosion stage, and are associated with large Fe-rich IM particles near the metal surface. The influence of marine growth on pitting was negligible.
Subject: aluminium alloy; morphology; pitting corrosion; SEM
Identifier: http://hdl.handle.net/1959.13/1440489
Identifier: uon:41160
Identifier: ISSN:1478-422X
Language: eng
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