Adsorption and corrosion inhibition behavior of Acanthus montanus leaves Extract on Mild Steel in Sulphuric acid Medium

¹Physical Chemistry Unit, Department of Chemistry, Rivers State University, Port Harcourt, Rivers States, Nigeria

²Physical Chemistry Unit, Department of Chemistry, University of Uyo, Akwa Ibom state, Nigeria

³Physical Chemistry Unit, Department of Chemistry, Nigeria Police Academy Wudil, Kano, Nigeria

*Corresponding Author: Udom I G, Physical Chemistry Unit, Department of Chemistry, Rivers State University, Port Harcourt, Rivers States, Nigeria; Email: [email protected]

Received Date: September 12, 2023

Publication Date: May 07, 2024

Citation: Cookey GA, et al. (2024). Adsorption and corrosion inhibition behavior of Acanthus montanus leaves Extract on Mild Steel in Sulphuric acid Medium. Catalysis Research. 3(3):16.

Copyright: Cookey GA, et al. © (2024). 

ABSTRACT

The inhibitive action and mechanism of Acanthus montanus leaves extract (AMLE) for the corrosion of mild steel in 2M H₂SO₄ was investigated using gravimetric, Potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), Fourier transform infrared (FTIR), and Scanning electron microscope (SEM) techniques. It was found that the extract inhibits the acid induced corrosion of mild steel. The inhibition efficiency (%IE) was observed to increase with increasing extract concentration but decreased with rise in temperature. Maximum inhibition efficiency value of 75.7% was obtained at 0.5g/l from gravimetric measurement. Electrochemical measurements results showed that AMLE acted as a mixed-type inhibitor. The adsorption of AMLE on mild steel was physical and obeyed Langmuir adsorption isotherm model. Kinetic data followed a first-order reaction type. Results obtained from the gravimetric, potentiodynamic polarization and impedance measurements showed similar trends of inhibition efficiency. Surface analysis by FTIR and SEM confirmed the formation of protective layer on the mild steel surface.

Keywords: Mild steel, Corrosion inhibition, Acanthus montanus, sulphuric acid