International Journal of Advanced Materials Research
Articles Information
International Journal of Advanced Materials Research, Vol.5, No.1, Mar. 2019, Pub. Date: May 5, 2019
Assessment of Corrosion Inhibitory Potential of Cordia millenii Leaves Extract on Mild Steel in Acidic Medium
Pages: 20-30 Views: 93 Downloads: 61
Authors
[01] Olasehinde Emmanuel Folorunso, Department of Chemistry, Federal University of Technology Akure, Akure, Nigeria.
[02] Tomilawo Busayo Akinwumi, Department of Chemistry, Federal University of Technology Akure, Akure, Nigeria; Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Nigeria.
[03] Abata Emmanuel Orimisan, Department of Chemistry, Federal University of Technology Akure, Akure, Nigeria.
[04] Ani Julius Udeh, Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Nigeria.
Abstract
The corrosion inhibitory potential of Ethanol Extract of Cordia millenii (EECM) leaves on mild steel corrosion in 1M H2SO4 solution was investigated using gravimetric and electrochemical techniques. Experiments were performed by varying the immersion time, extract concentration and reaction temperature. The results obtained from weight loss method showed a decrease in the corrosion rate of mild steel as the extract concentration increases while the inhibition efficiency increases with extract concentration. The highest inhibition efficiency observed for EECM at 1.0g/L was 92%. Temperature studies revealed an increase in inhibition efficiency with rise in temperature and activation energies were found to decrease in the inhibited solutions compared to uninhibited solutions. A mechanism of chemical adsorption of the plant components on the surface of the metal is proposed for the inhibition behaviour. The Kinetic and thermodynamic parameters were calculated and discussed. The adsorption of the EECM on mild steel surface was in accordance with the Langmuir adsorption isotherm. The potentiodynamic polarization curves revealed that the inhibitor acts as mixed-type inhibitor. FTIR results indicate that EECM contains O and N atoms in functional groups (O-H, N-H, C=C, C=N, C=O, C-O) and aromatic ring which meet the general consideration of a typical corrosion inhibitor. SEM- EDX results revealed that the corrosion of mild steel in 1 M H2SO4 was retarded by EECM due to an adsorption film that appeared on the surface.
Keywords
Corrosion, Mild Steel, Electrochemical, Gravimetric, Inhibition, Cordia millenii
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