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ABSTRACT
An investigatory study on “inhibitory effect of aloe Vera extract on corrosion susceptibility of medium carbon steel in aqueous saline (3.5% NaCl solution and natural seawater) solution” was carried out using gravimetric (weight loss) and electrochemical (Potentiodynamic Polarization) techniques.
Aloe Vera extract of 0%, 1%, 2%, 3% and 4% concentrations respectively were added to the corrosive media. From gravimetric study, the results obtained revealed that aloe Vera plant extract inhibited corrosion reaction and the inhibitor’s efficiency increased with increased concentration of extracts but decreased with prolonged exposure time. The extract was found to be best and effective inhibitor in 3.5% NaCl solution at 3% concentration with 70.84% efficiency at 168 hours of exposure. With prolonged exposure of 1008 hours, efficiency dropped to 47.06%. The extract was also found to be best and effective inhibitor in natural seawater at 4% concentration with 84.00% efficiency at 168 hours of exposure. At 1008 hours, efficiency dropped to 69.89%. Polarization data showed that the extract behaved mostly as mixed-type inhibitor. The inhibitor’s efficiency reached 98.79% at a concentration of 4% for 3.5% NaCl solution, while that of natural seawater reached 97.05% at the same concentration of 4%. The adsorption of the inhibitor was more suited with the Temkin and Freundlich adsorption isotherm and thermodynamic data calculated are suggestive of physical adsorption of the inhibitor molecules on the metal surface.
The results obtained indicate that this extract can serve as inexpensive and environmentally friendly alternative to the costly and toxic corrosion inhibitors presently in use.
