Application of ginger and grapefruit essential oil extracts on the corrosion inhibition of mild steel in dilute 0.5 M H2SO4 electrolyte

Loto, R. T. and Solomon, Moses M. (2022) Application of ginger and grapefruit essential oil extracts on the corrosion inhibition of mild steel in dilute 0.5 M H2SO4 electrolyte. Scientific African, 19.

PDF Download (126kB)

Abstract

Admixture of ginger and grapefruit essential oils (GPP) were studied for their corrosion inhibition properties on mild steel (MS) in 0.5 M H2SO4 solution by potentiodynamic polarization, open circuit potential measurement, electrochemical impedance spectroscopy, weight loss analysis and ATF‐FTIR spectroscopy. Results from potentiodynamic polarization 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 inhibition efficiency values ranged from 76.52% to 93.5% and corrosion current density from 1.88 × 10−4 A/cm2 to 5.36 × 10−5 A/cm2. 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 9000s, 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 Ω cm2 to 99.318 Ω cm2 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 concentration. The ATF‐FTIR results confirm the adsorption of GPP molecules on the surface of the carbon steel electrode.

Item Type:	Article
Uncontrolled Keywords:	Carbon steelCorrosion managementEssential oilInhibitionEnvironmental degradation
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TP Chemical technology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Patricia Nwokealisi
Date Deposited:	17 Jan 2025 13:52
Last Modified:	17 Jan 2025 13:52
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/18704

Actions (login required)

View Item