Author/Authors :
Hajjaji, Souad EL Laboratory of Spectroscopy - Molecular Modelling Materials - Nanomaterials Water and Environment –CERNE2D - Faculty of Sciences - Mohammed V University, Morocco , Akounach, Zahra Laboratory of Spectroscopy - Molecular Modelling Materials - Nanomaterials Water and Environment –CERNE2D - Faculty of Sciences - Mohammed V University, Morocco , Al Maofari, Ahmaed Laboratory of Spectroscopy - Molecular Modelling Materials - Nanomaterials Water and Environment –CERNE2D - Faculty of Sciences - Mohammed V University, Morocco , Yadini, Adil El Laboratory of Spectroscopy - Molecular Modelling Materials - Nanomaterials Water and Environment –CERNE2D - Faculty of Sciences - Mohammed V University, Morocco , Douche, Siham Laboratory of Spectroscopy - Molecular Modelling Materials - Nanomaterials Water and Environment –CERNE2D - Faculty of Sciences - Mohammed V University, Morocco , Benmessaoud, Mohamed Environment - Materials and Sustainable Development Team –CERNE2D - High School of Technology - Mohammed V University, Morocco , Damej, Mohamed Environment - Materials and Sustainable Development Team –CERNE2D - High School of Technology - Mohammed V University, Morocco , Ouaki, Benaceur Engineering Material Department - National School of Mineral Industry, Rabat-Morocco
Abstract :
Corrosion inhibition of mild steel in 1 M hydrochloric acid by water, hexane and
ethanol extracts of Pimpinella Anisum plant were study using weight loss and Tafel
polarization curves. The effects of temperature on the corrosion behavior of mild steel in 1M
hydrochloric acid with addition of extracts were also studied. The inhibition efficiency (IE)
increases with increasing concentration of Pimpinella Anisum extracts but decreases with
increasing the temperature. The adsorption of the extracts on the surface of metal follows a
Langmuir isotherm model. Polarization studies show that the extracts behave as mixed type
inhibitors. Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS)
study confirmed that the inhibition of corrosion of mild steel is through adsorption of the
extracts molecules on the surface of metal. Gas chromatography-mass spectroscopy (GC-MS)
results showed that anethole was the major compound of both Yemeni and Moroccan
Pimpinella Anisum plant.
Keywords :
Mild steel , Weight loss , Electrochemical , Corrosion inhibition , Anise extracts
