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Published in: Journal of Coatings Technology and Research 5/2020

08-11-2019

Corrosion beneath a blister with high impedance

Authors: Vinod Upadhyay, Luke Wiering, Zachary Bergseth, Xiaoning Qi, Dante Battocchi

Published in: Journal of Coatings Technology and Research | Issue 5/2020

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Abstract

In this work, the effect of blisters on the performance of protective coatings was investigated. Artificial blisters were generated by potentiostatic DC polarization of an epoxy-coated aluminum substrate and characterized using optical microscopy, electron microscopy (SEM), scanning electrochemical microscopy, as well as by scanning Kelvin probe (SKP) measurement. Impedance measured above blisters displayed high values, typical of an intact undamaged coating. SKP measurement above the blister identified regions of likely corrosion beneath it, which was verified by SEM. SEM images showed pitting-like corrosion beneath the blisters, implying that high impedance measured on delaminated coatings may correspond to the delaminated polymeric film. SKP was also able to identify regions of invisible delamination.

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Metadata
Title
Corrosion beneath a blister with high impedance
Authors
Vinod Upadhyay
Luke Wiering
Zachary Bergseth
Xiaoning Qi
Dante Battocchi
Publication date
08-11-2019
Publisher
Springer US
Published in
Journal of Coatings Technology and Research / Issue 5/2020
Print ISSN: 1547-0091
Electronic ISSN: 1935-3804
DOI
https://doi.org/10.1007/s11998-019-00280-9

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