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journalArticle
Liang
Mengxia
Melchers
Robert
Aluminium alloy
SEM
morphology
pitting corrosion
Two years pitting corrosion of AA5005-H34 aluminium alloy immersed in natural seawater: morphology characterisation
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.
1-12
June 16, 2020
Two years pitting corrosion of AA5005-H34 aluminium alloy immersed in natural seawater
https://doi.org/10.1080/1478422X.2020.1777363
2020-06-22 13:52:25
Taylor and Francis+NEJM
Publisher: Taylor & Francis
_eprint: https://doi.org/10.1080/1478422X.2020.1777363
Corrosion Engineering, Science and Technology
0
0
DOI 10.1080/1478422X.2020.1777363
ISSN 1478-422X