Abstract
Plant extracts are excellent alternatives as corrosion inhibitors because of availability, low toxicity, biodegradability and low cost. In this study, corrosion tests were performed on mild steel to evaluate the effect of concentration of inhibitor, varying immersion period and temperature on the corrosion inhibition properties of Clivia nobilis leaves extract. This was done in H2SO4 and HCl acid solutions using weight loss and gasometric methods. From the weight loss results, corrosion rate and degree of surface coverage were evaluated and plotted as a function of inhibitor concentration at various immersion times. The volume of the cathodic hydrogen gas evolved was also plotted as a function of inhibitor concentration. The efficiency of inhibition in H2SO4 and HCl solutions were also compared. It was observed that corrosion inhibition efficiency increased with increasing concentration of Clivia nobilis leaf extract but not with prolonged immersion period. Experimental data obtained at 313 and 333K fitted the Freundlich and Langmuir isotherms, suggesting adsorption of Clivia nobilis leaves extract on the metal surface. Activation energy data described the interaction as electrostatic.Keywords: Extract, corrosion, inhibitor, concentration, leaves
Highlights
Metal structures in use in chemical and related industries including oil and gas are exposed to aggressive substances such as acids, bases and salts containing chlorides, sulphates, nitrates, etc. (Ilayaraja et al, 2011)
The corrosion inhibition potential of aqueous extract of Clivia nobilis leaves in 2.0M H2SO4 and HCl solutions was investigated by evaluating the effects of inhibitor concentration, immersion time and temperature using weight loss and gasometric methods
Weight Loss Analysis Method: Five different concentrations (0.50, 1.00, 1.50, 2.00 and 2.50g/l) of the extracted gel were prepared in 2.0 M solutions of H2SO4 and HCl respectively. 2.0 M solutions of H2SO4 and HCl without inhibitor were used as control
Summary
Metal structures in use in chemical and related industries including oil and gas are exposed to aggressive substances such as acids, bases and salts containing chlorides, sulphates, nitrates, etc. (Ilayaraja et al, 2011). Several studies on the use of plant extracts for the inhibition of corrosion of mild steel have been reported (Nnenna et al, 2011; Patel et al, 2013; Obiokwu et al, 2015; Gusti et al, 2015; Fadare et al, 2016). Many of these authors have attributed inhibition to adsorption mechanism. Clivia nobilis is a flowering plant of the Amaryllidoideae family. The corrosion inhibition potential of aqueous extract of Clivia nobilis leaves in 2.0M H2SO4 and HCl solutions was investigated by evaluating the effects of inhibitor concentration, immersion time and temperature using weight loss and gasometric methods
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