Chemical Science & Engineering Research
Title
Electrochemical Corrosion Behaviour of Vernonia amygdalina on Mild Steel in Acid Environments
Authors
U. E. Opusunjua and N. C. Ngobiri*a,b
aInstitute of Natural Resources, Environment and Sustainable Development, University of Port Harcourt, Nigeria.
bDepartment of Pure and Industrial Chemistry, University of Port Harcourt, Nigeria
*Corresponding author E-mail address: nnaemeka.ngobiri@uniport.edu.ng (N. C. Ngobiri)
Article History
Publication details: Received: 03rd May 2022; Revised: 18th July 2022; Accepted: 18th July 2022; Published: 22nd July 2022
Cite this article
Opusunju U. E.; Ngobiri N. C. Electrochemical Corrosion Behaviour of Vernonia amygdalina on Mild Steel in Acid Environments. Chem. Sci. Eng. Res., 2022, 4(10), 54-57.
Abstract
The corrosion inhibition characteristics of Vernonia amygdalina stem extract were studied using two electrochemical techniques of potentiodynamic polarization and electrochemical impedance spectroscopy. The study was carried out in a dual-acid environment to ascertain the effect of the two acids on the corrosion inhibition capacity. The results obtained showed that Vernonia amygdalina stem extract inhibited the corrosion of mild steel corrosion comparatively in both acid environments. The potentiodynamic polarization results showed the extract to be a mixed type inhibitor, and decreased the corrosion current density, while the electrochemical impedance spectroscopy showed that the extract acted by decreasing the dielectric constant and increasing the charge transfer resistance, attributable to adsorption of the molecules of Vernonia amygdalina stem extract to metal/acid interface.
Keywords
Adsorption; Corrosion inhibition; Electrochemical impedance spectroscopy; Pipeline steel; Potentiodynamic polarization; Vernonia amygdalina
