Effect of Dates Extracts as Environmentally Friendly Corrosion Inhibitor for Carbon Steel in 1M HCl Solution

Abstract

Inhibitory effect of extracts from three date varieties namely khalt (kha), Lassiane (La) and Tadmamt (Td)), and the mixture of date varieties as environmentally friendly corrosion inhibitor for carbon steel in 1M HCl is studied by means of electrochemical tests such as electrochemical impedance spectroscopy (EIS), and Tafel polarization. It's been obtained that in 1.0 M HCl solution the date extracts are a new green corrosion inhibitor for carbon steel. The results found show that with increasing concentration of the date extracts the values of inhibition efficiency increased. Comparison of the experimental results of the three varieties and the extract mixture of dates, exhibited that inhibition efficiency increased in order Kha, La, Td and the mixture. Therefore, the extract mixture is the best inhibitor with a maximum inhibitory efficacy value reaching 91% at a concentration of 1% of the mixture. Polarization study revealed that dates extracts acted as a mixed inhibitor, with more principally cathodic process. The compounds of the date extracts are adsorbed on the metal surface forming the protective film, which explains the inhibitory action of these extracts, this result is confirmed by electron scanning microscopy (SEM).