Synergistic combination effect of clove essential oil extract with basil andatlas cedar oil on the corrosion inhibition of low carbon steel

Loto, R. T. and Olukeye, Tiwa and Okorie, Eugene (2019) Synergistic combination effect of clove essential oil extract with basil andatlas cedar oil on the corrosion inhibition of low carbon steel. South African Journal of Chemical Engineering, 30. pp. 28-41.

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Abstract

Clove essential oil extracts was separately admixed with basil oil extract (CLB) and atlas cedar oil extract (CLA),and studied for their corrosion inhibition properties on low carbon steel in 0.5 M H2SO4and HCl solutions bycoupon analysis, potentiodynamic polarization, open circuit potential measurement and optical microscopy.Results showed the two admixed inhibitor compounds performed effectively at most concentrations with optimalinhibition efficiencies of 95.48% and 95.32% in H2SO4solution while in HCl the corresponding values are 92.7%and 97.98%. CLB and CLA showed mixed inhibiting properties though shift in corrosion potential and Tafel slopevalues indicates dominant cathodic inhibition and higher cathodic exchange current density. Severe generaldeterioration was visible on the morphology of control (no inhibitor) steels in H2SO4while the morphology ofthe control steel from HCl showed extensive localized deterioration. Addition of CLB and CLA significantlyimproved the morphology of the steel in both acid solutions signifying effective corrosion inhibition. The opencircuit potential plots of the carbon steel in both acids showed significant potential transients due to thermo-dynamic instability in the presence of the inhibitors. However, the corrosion potential plots were significantlyelectropositive relative to the plot of the control specimen withfinal values−0.448V and−0.452V in H2SO4,and -0.476V in HCl (CLA).

Item Type:	Article
Uncontrolled Keywords:	Carbon steel Corrosion Oil Inhibitor
Subjects:	T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Mrs Hannah Akinwumi
Date Deposited:	28 Aug 2020 23:58
Last Modified:	28 Aug 2020 23:58
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/13555

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