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Electrochemical property analysis of SiO2-Al2O3-coated steel by electrochemical impedance spectroscopy

Electrochemical property analysis of SiO2-Al2O3-coated steel by electrochemical impedance... PurposeThe purpose of this paper is to investigate the corrosion resistance of SiO2-Al2O3 coating on mild steel.Design/methodology/approachSiO2-Al2O3 was coated using sol-gel method, and electrochemical measurements were applied to assess the performance of the coated steel.FindingsThe main conclusion is that SiO2-Al2O3-coated specimens acquired a higher corrosion resistance than that of uncoated specimen. icorr values of the coated specimens were between 12 and 14 times smaller than those of uncoated specimen. The coated specimens exhibited a higher Rcor value at electrochemical impedance spectroscopy analysis. The high values of Rcor and low values of CPEdl observed within the SiO2-Al2O3-coated samples imply an improved anti-corrosion capability.Originality/valueIn this work, there are three points of originality. First, steel specimens were coated with ormosil-based solution by applying sol-gel dip coating method. Second, both SiO2 and Al2O3 coatings were applied simultaneously at a considerably low temperature, i.e. 200 °C. Finally, the performance of the coated materials against wet corrosion was improved significantly. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Anti-Corrosion Methods and Materials Emerald Publishing

Electrochemical property analysis of SiO2-Al2O3-coated steel by electrochemical impedance spectroscopy

Kirtay, Sebahattin
Anti-Corrosion Methods and Materials , Volume 64 (4): 6 – Jun 5, 2017
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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0003-5599
DOI
10.1108/ACMM-06-2016-1678
Publisher site
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Abstract

PurposeThe purpose of this paper is to investigate the corrosion resistance of SiO2-Al2O3 coating on mild steel.Design/methodology/approachSiO2-Al2O3 was coated using sol-gel method, and electrochemical measurements were applied to assess the performance of the coated steel.FindingsThe main conclusion is that SiO2-Al2O3-coated specimens acquired a higher corrosion resistance than that of uncoated specimen. icorr values of the coated specimens were between 12 and 14 times smaller than those of uncoated specimen. The coated specimens exhibited a higher Rcor value at electrochemical impedance spectroscopy analysis. The high values of Rcor and low values of CPEdl observed within the SiO2-Al2O3-coated samples imply an improved anti-corrosion capability.Originality/valueIn this work, there are three points of originality. First, steel specimens were coated with ormosil-based solution by applying sol-gel dip coating method. Second, both SiO2 and Al2O3 coatings were applied simultaneously at a considerably low temperature, i.e. 200 °C. Finally, the performance of the coated materials against wet corrosion was improved significantly.

Journal

Anti-Corrosion Methods and Materials – Emerald Publishing

Published: Jun 5, 2017

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