Cinnamon essential oil as a novel eco-friendly corrosion inhibitor of copper in 0.5 M sulfuric acid medium

The oil of cinnamon essential (cio),analyzed by gas chromatography (gc) and gas chromatography-mass spectrometry (gc-ms) was made. the analyzed oils consist mainly trans-cinnamaldehyde (46.30%),d-cadinene (8.16%) and ß-cubebene (5.20%) being the major constituents,on the corrosion of copper in aqueous 0.5 m sulfuric acid studied by electrochemical impedance spectroscopy (eis) and potentiodynamic polarization. eis and polarization measurements showed that the dissolution process of copper occurs under diffusion control. potentiodynamic polarization curves indicated that the essential oil extract behaves as cathodic-type inhibitor. the corrosion rates of copper and the inhibition efficiencies of the extract were calculated. the results obtained show that the extract solution of the essential oil could serve as an effective inhibitor for the corrosion of copper in sulphuric acid media. © 2017,university of mohammed premier oujda morocco.