Application of ginger and grapefruit essential oil extracts on the corrosion inhibition of mild steel in dilute 0.5 M H 2 SO 4 electrolyte

Loto, R. T. and Solomon, Moses M. (2023) Application of ginger and grapefruit essential oil extracts on the corrosion inhibition of mild steel in dilute 0.5 M H 2 SO 4 electrolyte. Scientific African.

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Abstract

Admixture of ginger and grapefruit essential oils (GPP) were studied for their corrosion inhibition properties on mild steel (MS) in 0.5 M H 2 SO 4 solution by potentiodynamic po- larization, open circuit potential measurement, electrochemical impedance spectroscopy, weight loss analysis and ATF-FTIR spectroscopy. Results from potentiodynamic polariza- tion shows GPP significantly reduced the corrosion of MS from 8.430 mm/y at 0% GPP concentration to values between 1.979 mm/y and 0.565 mm/y. The corresponding inhi- bition efficiency values ranged from 76.52% to 93.5% and corrosion current density from 1.88 ×10 −4 A/cm 2 to 5.36 ×10 −5 A/cm 2 . GPP displayed mixed-type inhibition at all GPP concentrations studied. The OCP plot at 0% GPP initiated at -0.495V compared to -0.443V and -0.451V at 1% and 3.5% GPP. At 90 0 0s, the corresponding OCP values are -0.442V, - 0.410V and -0.424V due to electropositive plot shift and passivation of MS surface at 1% and 3.5% GPP, though significant potential transients were present on the OCP plot at 1% GPP. The electrochemical impedance results indicate that the corrosion resistance of MS increased from 4.402 �cm 2 to 99.318 �cm 2 upon the addition of 3.5% GPP resulting in inhibition efficiency of 96%. Data from weight loss analysis shows decrease in corrosion rate from 184.48 mm/y to values between 8.94 mm/y and 6.25 mm/y. The corresponding inhibition efficiency values varies from 95.16% at 1% GPP to 96.61% at 3.5% GPP concentra- tion. The ATF-FTIR results confirm the adsorption of GPP molecules on the surface of the carbon steel electrode

Item Type:	Article
Uncontrolled Keywords:	Carbon steel Corrosion management Essential oil Inhibition Environmental degradation
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User:	nwokealisi
Date Deposited:	11 Apr 2023 14:51
Last Modified:	11 Apr 2023 14:51
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/16790

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