INHIBITION EFFECT OF ADMIXED CITRUS PARADISE AND CYMBOPOGON OIL DISTILLATES ON THE CORROSION RESISTANCE MILD STEEL IN DILUTE ACID ELECTROLYTES

Roland Tolulope Loto, Okpaleke Precious Chukwuebuka and Udoh Ufansi
Additional contact information
Roland Tolulope Loto: Department of Mechanical Engineering, Covenant University, Ota, Ogun State, Nigeria
Okpaleke Precious Chukwuebuka: Department of Mechanical Engineering, Covenant University, Ota, Ogun State, Nigeria
Udoh Ufansi: Department of Mechanical Engineering, Covenant University, Ota, Ogun State, Nigeria

Surface Review and Letters (SRL), 2021, vol. 28, issue 04, 1-9

Abstract: Corrosion suppression effect of the combination of citrus paradise and cymbopogon oil distillates on mild steel (MS) in 0.5M H2SO4 and HCl solution was studied by potentiodynamic polarization, open circuit potential measurement, optical microscopy characterization, and ATF-FTIR spectroscopy. The distillates performed adequately in both acids at all concentrations considered with average inhibition efficiency above 90%. Corrosion rate of the non-inhibited steel at 7.690 and 2.819mm/y from both acids were substantially reduced to values between 0.465 and 0.466mm/y in H2SO4 while the values in HCl are 0.081 and 0.034mm/y. The distillates exhibit mixed type inhibition performance in both acids. However, polarization plots displayed cathodic passivation effect at higher distillate concentration in H2SO4 while cathodic-anodic passivation plots were observed at all distillate concentrations in HCl solution. Corrosion potential plots from open circuit measurement at specific distillate concentrations were significantly electropositive compared to the non-inhibited steel which was electronegative. Inhibition effect of the distillates occurred through chemisorption adsorption mechanism with Gibbs free energy values greater than −40KJ/Mol, in agreement with Langmuir isotherm model. Optical images of the non-inhibited steel displayed a severely degraded exterior which significantly contrast the protected exterior of the inhibited steel.

Keywords: Corrosion; adsorption; carbon steel; inhibitor; essential oil (search for similar items in EconPapers)
Date: 2021
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.worldscientific.com/doi/abs/10.1142/S0218625X21500165
Access to full text is restricted to subscribers

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wsi:srlxxx:v:28:y:2021:i:04:n:s0218625x21500165

Ordering information: This journal article can be ordered from

DOI: 10.1142/S0218625X21500165

Access Statistics for this article

Surface Review and Letters (SRL) is currently edited by S Y Tong

More articles in Surface Review and Letters (SRL) from World Scientific Publishing Co. Pte. Ltd.
Bibliographic data for series maintained by Tai Tone Lim ().