Effect of r-GO/TiO2 hybrid composite as corrosion-protective coating on magnesium in sulphur-based electrolyte
Anti-Corrosion Methods and Materials
ISSN: 0003-5599
Article publication date: 17 July 2018
Issue publication date: 24 July 2018
Abstract
Purpose
This paper aims to examine the investigations made on the corrosion behaviour of magnesium (Mg) substrate electrodeposited using different nano-materials.
Design/methodology/approach
This study uses nano-materials such as those of reduced graphene oxide (r-GO), titanium-di-oxide (TiO2) and also r-GO/TiO2 nano-composites (dispersed through ultra-sonication process) at 3-min time interval. Crystalline nature of synthesized TiO2 is studied through X-ray diffraction and its pore volume is measured to be approximately 0.1851ccg-1 by Brunauer Emmett Teller analysis.
Findings
Surface morphology of the developed set of specimens inspected through scanning electron microscopy and energy dispersive spectroscopy establishes a clean surface coating and further witnesses for only minimal defects. Electrochemical behaviour of the developed coating is studied exhaustively using Tafel polarization and electrochemical impedance spectroscopy in 0.1 M Na2SO4 solution.
Originality/value
Incremental corrosion resistance exhibited by developed composite coating owes to the factors viz. chemical stability and hydrophobic tendency of TiO2 and r-GO; these known engineering facts resist the flow of ions into the corrosive media and thereby reduce the rate of corrosion.
Keywords
Citation
Mohan Das Gandhi, A.G., Soorya Prakash, K. and Kavimani, V. (2018), "Effect of r-GO/TiO2 hybrid composite as corrosion-protective coating on magnesium in sulphur-based electrolyte", Anti-Corrosion Methods and Materials, Vol. 65 No. 4, pp. 375-382. https://doi.org/10.1108/ACMM-09-2017-1837
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited