Corrosion inhibition and adsorption properties of ethanol extract of Heinsia crinata on mild steel in H2SO4

N.O. Eddy (Department of Chemistry, Ahmadu Bello University, Zaria, Nigeria)
A.O. Odiongenyi (Department of Science Technology, Akwa Ibom State Polytechnic, Ikot Osurua, Ikot Ekpene, Nigeria)

Pigment & Resin Technology

ISSN: 0369-9420

Publication date: 14 September 2010

Abstract

Purpose

The purpose of this paper is to study the inhibitive and adsorptive characteristics of ethanol extract of Heinsia crinata for the corrosion of mild steel in H2SO4 solutions.

Design/methodology/approach

The inhibition efficiencies were evaluated using weight loss, thermometric and hydrogen evolution techniques while adsorption properties were studied using IR spectroscopy.

Findings

The inhibition efficiency of ethanol extract of Heinsia crinata varies with concentration of the extract, period of immersion and with temperature. The extract acts as an adsorption inhibitor because of its phytochemical composition. The extract is adsorbed spontaneously on the surface of mild steel according to Temkin and Frumkin adsorption isotherms. The mechanism of physical adsorption is proposed from the trend of the inhibition efficiency with temperature and the values of some kinetic and thermodynamic parameters obtained.

Research limitations/implications

The paper provides information on the use of ethanol extract of Heinsia crinata as a corrosion inhibitor. Electrochemical studies such as polarisation and AC impedance spectra will throw more light on the mechanistic aspects of the corrosion inhibition.

Practical implications

Ethanol extract of Heinsia crinata can be used as an environmentally friendly inhibitor for the corrosion of mild steel in H2SO4. This environmentally friendly inhibitor could find possible applications in metal surface anodising and surface coatings.

Originality/value

The paper provides information on an environmentally‐friendly corrosion inhibitor.

Keywords

Citation

Eddy, N. and Odiongenyi, A. (2010), "Corrosion inhibition and adsorption properties of ethanol extract of Heinsia crinata on mild steel in H2SO4", Pigment & Resin Technology, Vol. 39 No. 5, pp. 288-295. https://doi.org/10.1108/03699421011076407

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Publisher

:

Emerald Group Publishing Limited

Copyright © 2010, Emerald Group Publishing Limited

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