ANTICORROSION PROTECTIVE COATINGS BY ADSORBED NATURAL EXTRACT INHIBITOR FOR MILD STEEL CORROSION IN NEUTRAL SOLUTIONS

In order to prevent mild steel corrosion during immersion in different aggressive media, recent research studies now focus on the development of non-toxic, inexpensive and environmentally friendly corrosion inhibitors as alternatives to different synthetic compounds, inhibitors derived from natural extracts, readily available from a wide range of renewable sources. As the extraction process is a simpler and low-cost procedure, this paper attempts to assess the inhibitive effect of natural plants selective extracts obtained from indigenous flora. Thus, the alcoholic extract from Juglans Regia buds (JRB) can be valorised after the expiration date by using it as a natural green inhibitor. The inhibitor effects of this vegetal extract tested at different concentrations has been determined by various electrochemical techniques in 1N NaCl solution using a thermostated three electrode electrochemical cell. The next step was to determine the kinetic parameters and hence the corrosion rate. The inhibition efficiency was found to increase with increasing extract concentration, up to a limiting value. The addition of the JRB extract in the corrosive solution decreases the charge capacitance facilitating the formation of an adsorbed layer over the steel surface. The cumullated results suggest that this natural extract may serve as effective inhibitor for the corrosion of mild steel in aggressive neutral solutions.