Murraya Koenigii as Green Corrosion Inhibitor for Mild Steel in CO2-saturated 3.5% NaCl Medium

  • Sarah Balqis Amir School of Chemical Sciences, Universiti Sains Malaysia, 11800 Gelugor, P. Pinang, Malaysia
  • Nurin Asyiqin Sallehudin School of Chemical Sciences, Universiti Sains Malaysia, 11800 Gelugor, P. Pinang, Malaysia
  • Mohamad Nurul Azmi School of Chemical Sciences, Universiti Sains Malaysia, 11800 Gelugor, P. Pinang, Malaysia
  • Mohd. Hazwan Hussin School of Chemical Sciences, Universiti Sains Malaysia, 11800 Gelugor, P. Pinang, Malaysia
  • Afidah Abdul Rahim School of Chemical Sciences, Universiti Sains Malaysia, 11800 Gelugor, P. Pinang, Malaysia
  • Hasnah Osman School of Chemical Sciences, Universiti Sains Malaysia, 11800 Gelugor, P. Pinang, Malaysia
  • Khalijah Awang Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia
  • Pandian Bothi Raja School of Chemical Sciences, Universiti Sains Malaysia, 11800 Gelugor, P. Pinang, Malaysia
Keywords: Green corrosion inhibitor; mild steel; Murraya koenigii; potentiodynamic polarization; SEM

Abstract

Green corrosion inhibitor is one of the recent emerging remedy to prevent oil and gas pipeline corrosion. In this study, the leaf extract of Murraya koenigii (curry leaf tree) has been tested as a corrosion inhibitor for mild steel corrosion in CO2-saturated 3.5% NaCl medium. Standard corrosion evaluation techniques viz., weight loss method and electrochemical technique (potentiodynamic polarization) were employed to study the corrosion inhibition properties. The changes of surface morphology on mild steel specimens before and after corrosion studies were screened through scanning electron microscopy (SEM) combined with energy dispersive X-Ray analyzer (EDX). In addition, Fourier Transform Infrared (FTIR) Spectroscopy was used to characterize the leaf extract and the corrosion protective film formed over the mild steel surfaces. Results showed that Murraya koenigii leaf extract successfully reduced the corrosion rate through adsorption process, which followed the Langmuir adsorption isotherm.

Published
2020-03-24