Title
Corrosion study on Al-rich metal-coated steel by odd random phase multisine electrochemical impedance spectroscopy Corrosion study on Al-rich metal-coated steel by odd random phase multisine electrochemical impedance spectroscopy
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
article
Publication
London ,
Subject
Physics
Chemistry
Engineering sciences. Technology
Source (journal)
Electrochimica acta. - London
Volume/pages
124(2014) , p. 165-175
ISSN
0013-4686
ISI
000335109600021
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Galvanized steel is widely used in transportation and industry. However, the corrosion performance of these products is highly affected while exposed to chloride-containing environments. One alternative is Al-rich metal coatings which are known to notably improve the corrosion protection of the steel substrate by the enhanced barrier properties provided by Al. Although hot dip aluminum-based coatings on steel are nowadays used for many applications, little is known about the electrochemical behaviour of these coatings. This work studies the corrosion behaviour of Al-containing metal coated steel. Odd random phase multisine electrochemical impedance spectroscopy (ORP-EIS) is used for monitoring the corrosion evolution under continuous immersion in a NaCl solution. This technique allows a rapid screening of corrosion processes due to the reduced measurement time with respect to conventional single sine techniques. Extra information concerning linearity, stationarity and noise level is also supplied and can be valuable for further data quality evaluation and fitting. Different equivalent electrical circuits are proposed and their validity is discussed, not only based on physical phenomena but also taking the quality of the obtained data and the statistical evaluation of the fittings into account.
E-info
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