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Influence of Lavandula latifolia and Ricinus communis Oils on the Corrosion Control of Mild Steel in HCl Solution

  • Cleophas A. Loto
  • Roland T. LotoEmail author
Technical Article---Peer-Reviewed
  • 26 Downloads

Abstract

Influence of the combined admixture of Lavandula latifolia and Ricinus communis oils (LACA) on the corrosion inhibition of mild steel immersed in 0.5 M HCl media was evaluated at an operating temperature of 25 °C by weight loss and potentiodynamic polarization methods. Observation shows inhibition efficiency increased with an increase in concentration. At 336 h of the experiment, the concentration of the 2, 4, 6 and 8 per 200 mL HCl concentrations exhibited minimal but stable weight loss till 144 h. In 2 mL HCl solution, weight loss value of 0.307 g was obtained at 312 h. HCl concentration of 12 mL exhibited optimal performance at 312 h with weight loss and corrosion rate value of 0.088 g and 0.48 mm/y. The corresponding inhibition efficiency is 88%. Results of cathodic and anodic Tafel slope indicate mixed-type inhibition effect. Adsorption isotherm showed that the inhibitor protection mechanism followed both the Frumkin and the Freundlich models more than the Langmuir isotherm model.

Keywords

Corrosion Lavandula latifolia Ricinus communis Potentiodynamic polarization Steel 

Notes

Acknowledgments

The authors appreciate the laboratory performed by Mr. O. Olaniyan and the support given by Covenant University, Ota to conduct the research.

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Copyright information

© ASM International 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringCovenant UniversityOtaNigeria
  2. 2.Department of Chemical, Metallurgical and Materials EngineeringTshwane University of TechnologyPretoriaSouth Africa

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