In this study, an agricultural waste product was used to prepare a green
corrosion inhibitor based on olive leaves (Olea Europaea Syslvestris).
Firstly, an optimization study of antioxidant activity of Olea Europaea
Syslvestris leaves monitored by the DPPH free radical trapping method, was
carried out using full factorial design. In the second step, the extract
obtained under optimal conditions was tested as a green corrosion inhibitor
for steel in 0.5 mol dm?3 HCl, using gravimetric and electrochemical
methods. The results obtained by various tech-niques showed that the extract
acted as a mixed-type inhibitor. The adsorption of the inhibitor was
spontaneous (?Gads = ?12.443kJ mol?1), through the mechanism of physical
adsorption, and it obeyed the Langmuir adsorption isotherm. The highest
corrosion inhibition efficiency of 92 % was obtained for 2.8 10?3 g cm?3of
inhibitor, as measured by gravimetric method.