Abstract
The Alkaloid and Non- alkaloid fractions of the ethanolic extracts from Costus afer (AECA and NAECA) were comparatively studied for their inhibitive properties on the corrosion of mild steel in 5 M HCl solution using Gravimetric and Gasometric techniques. The results revealed that both extracts inhibited the corrosion of mild steel in HCl solution following the order: NAECA > AECA. The maximum inhibition efficiencies obtained were 49.2 % for AECA and 86.4% for NAECA at an inhibitor concentration of 5 g/L. Inhibition efficiency was found to increase with increase in concentration and increase in temperature. The adsorption of both extracts on the mild steel was found to be consistent with Langmuir adsorption isotherm.Physical adsorption mechanism was proposed for the adsorption of the components of the extracts on the mild steel surface.KEYWORDS: Adsorption; Alkaloid; Corrosion inhibition; Non-alkaloid; Mild steel.
Highlights
Recent industrial history shows many failures due to the use of metallic mild steel structures which are in contact with aqueous media
The experiment was performed for inhibitor concentration of 0.5, 1.0, 2.0, 3.0 and 5.0 g/L and 5 M HCl solution at 50, 40 and 30o C for AECA and NAECA
The Alkaloid and Non alkaloid fractions of the ethanolic extracts (AECA and NAECA) of Costus afer functioned as corrosion inhibitors for mild steel in HCl solution
Summary
Recent industrial history shows many failures due to the use of metallic mild steel structures which are in contact with aqueous media. This present work is aimed at investigating the effect of different concentrations of alkaloid extracts and non-alkaloid fractions of ethanolic extracts of Costus afer stem on the corrosion of mild steel in HCl solution using gravimetric and gasometric techniques.
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