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

Sebahattin Kirtay (Department of Metallurgical and Materials Engineering, Istanbul University, Istanbul, Turkey)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Publication date: 5 June 2017

Abstract

Purpose

The purpose of this paper is to investigate the corrosion resistance of SiO2-Al2O3 coating on mild steel.

Design/methodology/approach

SiO2-Al2O3 was coated using sol-gel method, and electrochemical measurements were applied to assess the performance of the coated steel.

Findings

The 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/value

In 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.

Keywords

Acknowledgements

This work was supported by Scientific Research Projects Coordination Unit of Istanbul University. Project number BYP 54,702.

Citation

Kirtay, S. (2017), "Electrochemical property analysis of SiO2-Al2O3-coated steel by electrochemical impedance spectroscopy", Anti-Corrosion Methods and Materials, Vol. 64 No. 4, pp. 365-370. https://doi.org/10.1108/ACMM-06-2016-1678

Publisher

:

Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited