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Vol. 30 No. 3 (2018): Vol 30 Issue 3

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Gloriosa superba Linn. Extract as Eco-friendly Inhibitor for Mild Steel in Acid Medium: A Comparative Study

https://doi.org/10.14233/ajchem.2018.20939
P.R. Sivakumar
PG & Research Department of Chemistry, Government Arts College (Autonomous), Coimbatore-641 018, India
A.P. Srikanth
PG & Research Department of Chemistry, Government Arts College (Autonomous), Coimbatore-641 018, India

Corresponding Author(s) : A.P. Srikanth

apsrikanth8@gmail.com

Asian Journal of Chemistry, Vol. 30 No. 3 (2018): Vol 30 Issue 3

Abstract

The comparative studies of various parts of the plant Gloriosa superba Linn. extract (leaves, flowers, stems, tubers) were carried out to investigate the corrosion protection efficiency on the corrosion of mild steel in 1 N HCl medium by using mass loss method, polarization measurements and electrochemical impedance spectroscopy at room temperature. Polarization measurements showed that the studied extract acts as mixed type inhibitor with significant reduction of cathodic and anodic current densities. Organic moieties present in the extract are found responsible for effective performance of inhibitor which is well supported by FTIR studies. On comparison, optimum inhibition efficiency was found in Gloriosa superba Linn. stem extracts with 99.80 % at 15 ppm concentration. The nature of protective film formed on the mild steel surface has been confirmed by SEM analysis. The surface coverage values fits well to the Temkin adsorption isotherm.

Keywords

Gloriosa superba Linn. Corrosion Electrochemical impedance spectroscopy
Sivakumar, P., & Srikanth, A. (2018). Gloriosa superba Linn. Extract as Eco-friendly Inhibitor for Mild Steel in Acid Medium: A Comparative Study. Asian Journal of Chemistry, 30(3), 513–519. https://doi.org/10.14233/ajchem.2018.20939
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