Abstract
This work deals with the biosynthesis of ZnO nanoparticles (ZnO NPs) by the extract of Plectranthus amboinicus (E.P.a) leaves and the study of their inhibiting effect on X60 steel corrosion in 1 M HCl. The characterization methods used for P.a- ZnO NPs are X-ray diffraction (XRD), UV–visible spectroscopy, Fourier Transform Infrared (FTIR), Scanning Electron Microscopy coupled with Energy Dispersive Spectroscopy (SEM-EDS). The average size of ZnO NPs is 76.88 nm with a wurtzite hexagonal structure. The inhibition of X60 steel corrosion in 1.0 M HCl with Pa- ZnO NPs was studied at different concentrations using Electrochemical Impedance Spectroscopy (EIS) and Potentiodynamic Polarization (PDP) measurements. The maximum inhibitory efficacy is 78.54 % at 0.15 ppm Pa- ZnO NPs, the latter behave as a mixed inhibitor. SEM micrographs and the rugosimetry confirm the inhibitor film presence. P.a- ZnO NPs is a good corrosion inhibitor of X60 steel in 1 M HCl.
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