Hybrid corrosionresistant coatings analyzed using electrochemical noise

Purpose The purpose of this paper is to study the corrosion of carbon steel without coating and when protected using three different hybrid coatings, i.e. a bicomponent polyurethane with nanoparticles of SiO2 with and without sacrificial anode particles, and a monocomponent polyurethane with SiO2 pa...

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Bibliographic Details
Published in:Anti-corrosion methods and materials 2009-11, Vol.56 (6), p.310-315
Main Authors: GarcaHernandez, Fernando, HernndezSandoval, Luis, RegaladoGonzlez, Carlos, MojicaGmez, Jos, MeasVong, Yunny, EspinosaAcosta, Guillermo, Estvez, Miriam, Castao, Victor
Format: Article
Language:English
Subjects:
Coatings
Corrosion
Corrosion resistance
Electrochemistry
Steel
Online Access:Get full text
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Summary:Purpose The purpose of this paper is to study the corrosion of carbon steel without coating and when protected using three different hybrid coatings, i.e. a bicomponent polyurethane with nanoparticles of SiO2 with and without sacrificial anode particles, and a monocomponent polyurethane with SiO2 particles. Designmethodologyapproach In this investigation three different nanostructured coatings are developed and applied to steel substrates and then tested for their corrosion resistance defined as Rn, under a very aggressive medium pH1.5 in a dynamic system loop reactor. Their performance is evaluated using an electrochemical noise EN resistance technique. The electrodes are connected to a potentiostat and measurements are recorded as per the EN technique over a 2,048s duration at 0, 24, and 48h intervals. Scanning electron microscopy SEM are obtained before and after the corrosion trials to characterize the control and the different coating systems. Findings The results show that a bicomponent coating, made up of alkyd resin and silica nanoparticles demonstrated the best performance, whereas the coating formed by SiO2 nanoparticles and polyurethane resin showed relatively low corrosion resistance. The inclusion of zinc nanoparticles in a third coating as sacrificial nanoanodes led to segregation and resulted in moderate corrosion resistance. These results are confirmed by SEM observations. Originalityvalue The results obtained in this paper provide an insight to the understanding of the anticorrosion properties of three different hybrid coatings in a dynamic system loop reactor.
ISSN:0003-5599
DOI:10.1108/00035590911000287