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The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces

Christos Kousis, Patrick Keil, Hamilton McMurray, Geraint Williams Orcid Logo

Corrosion Science, Volume: 206, Start page: 110477

Swansea University Authors: Christos Kousis, Hamilton McMurray, Geraint Williams Orcid Logo

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Abstract

The filiform corrosion (FFC) of organic coated magnesium alloys is investigated using in-situ scanning Kelvin probe and time-lapse photography. FFC is initiated by injecting MgCl2, HCl and FeCl2 into a coating defect and ensuing FFC propagation rates are shown to increase as a logarithmic function o...

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Published in: Corrosion Science
ISSN: 0010-938X
Published: Elsevier BV 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa60454
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Abstract: The filiform corrosion (FFC) of organic coated magnesium alloys is investigated using in-situ scanning Kelvin probe and time-lapse photography. FFC is initiated by injecting MgCl2, HCl and FeCl2 into a coating defect and ensuing FFC propagation rates are shown to increase as a logarithmic function of the chloride ion concentration and are strongly dependent on relative humidity. Post-corrosion surface analysis shows chloride abundance near the filament leading edge and evidence of sequestration within corroded regions behind. The FFC mechanism is consistent with chloride-induced anodic dissolution at the front coupling with water reduction on a cathodically-activated corroded surface behind.
Item Description: Data availability:The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.
Keywords: Magnesium alloy; organic coating; anodic disbondment; filiform corrosion
College: Faculty of Science and Engineering
Funders: EPSRC-funded Centre for Doctoral Training in advanced functional coatings (COATED2): EP/L015099/1
Start Page: 110477