Corrosion Inhibition Studies of Mild Steel in Acid Medium UsingMusa AcuminataFruit Peel Extract

N Gunavathy,S C Murugavel

doi:10.1155/2012/952402

Abstract

The inhibition effect of unripe fruit peel extract ofMusa acuminata(Cultivar variety – Nendran) (MNP) on corrosion of mild steel in 1 N HCl has been investigated by weight loss and electrochemical impedance spectroscopy (EIS) with various concentrations of the extract. The effect of temperature on the corrosion inhibition of mild steel in the temperature range of 30°C – 80°C was carried out. The results indicate that MNP extract act as an effective inhibitor in the acid environment and is of mixed type inhibitor having efficiency as high as 96% at 2% inhibitor concentration. The inhibition efficiency of MNP extract increases with the increase of concentration but decreases with the increase in temperature. The inhibitor achieves its inhibition by physical adsorption of nutrients of the peel extract on the surface of the mild steel. The experimental data revealed that the adsorption occurred according to the Langmuir and Temkin adsorption isotherm.

Highlights

An antique fruit crop of the world, known as ‘Apple of the paradise’ botanically named as Musa acuminata (Nendran), cheapest and plentiful fruit, used widely as food without apparent toxic effect, having antimicrobial and antioxidant activity contains starch, fructosans, phenolic acids, anthocyanins, terpenoids, sterols, polyphenols, gallocatechin and dopamine[1,2,3,4,5]
The inhibition efficiency of mild steel exposed to different concentration of MNP extract in
The corrosion inhibition efficiency increased with the increase in concentration of the peel extract 13

Summary

Introduction

An antique fruit crop of the world, known as ‘Apple of the paradise’ botanically named as Musa acuminata (Nendran), cheapest and plentiful fruit, used widely as food without apparent toxic effect, having antimicrobial and antioxidant activity contains starch, fructosans, phenolic acids, anthocyanins, terpenoids, sterols, polyphenols, gallocatechin and dopamine[1,2,3,4,5]. The study examines the action of unripe Musa acuminata fruit peel extract as corrosion inhibitor of mild steel in acid medium with various concentrations and temperature. The inhibition efficiency of mild steel exposed to different concentration of MNP extract in

Results

Conclusion