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The kinetics and mechanism of filiform corrosion occurring on zinc-aluminium-magnesium coated steel

Natalie Wint, D. Eaves, E. Michailidou, A. Bennett, Justin Searle Orcid Logo, Geraint Williams Orcid Logo, Hamilton McMurray

Corrosion Science, Volume: 158

Swansea University Authors: Natalie Wint, Justin Searle Orcid Logo, Geraint Williams Orcid Logo, Hamilton McMurray

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DOI (Published version): 10.1016/j.corsci.2019.06.028

Abstract

This paper describes a systematic study into the initiation and propagation of filiform corrosion (FFC) on industrially important Zinc-Aluminium-Magnesium (ZAM) alloy coatings for steels. An artificial scribe defect is created in model organic coatings applied to ZAM. Corrosion is initiated using HC...

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Published in: Corrosion Science
ISSN: 0010-938X
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50974
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Abstract: This paper describes a systematic study into the initiation and propagation of filiform corrosion (FFC) on industrially important Zinc-Aluminium-Magnesium (ZAM) alloy coatings for steels. An artificial scribe defect is created in model organic coatings applied to ZAM. Corrosion is initiated using HCl, NaCl, FeCl2 and acetic acid. Only acetic acid is able to reproducibly initiate FFC. The FFC (area) rate is shown to be proportional to the amount of acetic acid introduced. The FFC mechanism is explained in terms of the relative susceptibility of alloy phases to anodic dissolution, determined using scanning electron microscopy and scanning Kelvin probe force microscopy.
Keywords: A Steel, A Magnesium, A Metal Coatings, C Atmospheric, Corrosion C Polymer Coatings
College: Faculty of Science and Engineering

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