The mechanism of group (I) chloride initiated filiform corrosion on iron

The initiation and propagation of filiform corrosion (FFC) on polymer-coated iron following contact with aqueous group (I) chloride salts is investigated using in situ scanning Kelvinprobe (SKP) and ex situ SIMS measurements. Prior to the onset of FFC a circular area of cathodic delamination is obse...

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Bibliographic Details
Published in:Electrochemistry communications 2003-10, Vol.5 (10), p.871-877
Main Authors: Williams, Geraint, McMurray, H.Neil
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric
Chloride
Corrosion
Corrosion mechanisms
Exact sciences and technology
Filiform
Iron
Kelvinprobe
Metals. Metallurgy
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Summary:The initiation and propagation of filiform corrosion (FFC) on polymer-coated iron following contact with aqueous group (I) chloride salts is investigated using in situ scanning Kelvinprobe (SKP) and ex situ SIMS measurements. Prior to the onset of FFC a circular area of cathodic delamination is observed to grow radially from a penetrative coating defect. The delaminated zone is abundant in group (I) cations, whereas Cl − anions are substantially excluded. As cathodic delamination slows to a halt corrosion filaments initiate at the coating defect and propagate across the delaminated zone at ca. 0.33 μm min −1. Filaments travelling beyond the delaminated zone show only a small (
ISSN:1388-2481
1873-1902
DOI:10.1016/j.elecom.2003.08.008