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Journal of Failure Analysis and Prevention

, Volume 18, Issue 6, pp 1429–1438 | Cite as

Synergistic Combination Effect of Salvia officinalis and Lavandula officinalis on the Corrosion Inhibition of Low-Carbon Steel in the Presence of SO42−- and Cl-Containing Aqueous Environment

  • Roland Tolulope LotoEmail author
  • Richard Leramo
  • Babatunde Oyebade
Technical Article---Peer-Reviewed
  • 66 Downloads

Abstract

The corrosion inhibition of low-carbon steel in 1 M H2SO4 and HCl solutions by the admixture of Salvia officinalis and Lavandula officinalis essential oil extracts was studied through potentiodynamic polarization analysis, coupon measurement and optical microscopy. The carbon steel undergoes severe surface deterioration in H2SO4, while the morphology of the steel from HCl showed selective deterioration with numerous corrosion pits in the absence of the oil extracts. The extracts performed effectively in the acid media with optimal inhibition efficiency of 86.92 and 96.90% in H2SO4, and 84.68 and 97.59% in HCl from potentiodynamic polarization and coupon analysis. The oil extract displayed anodic inhibition properties in H2SO4 due to surface coverage of the steel and cathodic inhibition in HCl due to selective precipitation of extract molecules. Thermodynamic calculations show the extracts adsorbed onto the steel surface, effectively suppressing the corrosion reactions through chemisorption mechanism according to the Langmuir, Frumkin and Freundlich adsorption isotherms.

Keywords

Corrosion Inhibition Essential oil Steel 

Notes

Acknowledgments

The author recognizes the support given by Covenant University Ota, Ogun State, Nigeria towards the sponsorship, implementation and successful completion of the research.

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Copyright information

© ASM International 2018

Authors and Affiliations

  • Roland Tolulope Loto
    • 1
    Email author
  • Richard Leramo
    • 1
  • Babatunde Oyebade
    • 1
  1. 1.Department of Mechanical EngineeringCovenant UniversityOtaNigeria

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