The Potential Use of Myrtus Oil as a Corrosion Inhibitor of Brass (Cu70-Zn30) Immersed in 3% NaCl Solution (Pages: 35-49)

S. Tazi1, I. Raissouni1, F. Chaouket1, D. Bouchta1, R. Elkhamlichi1, H. Belcadi2, H. Douhri1 and N. Ben Abderrazik3

1Materials and Interfacial Systems Laboratory;  2Applied Organic Chemistry Laboratory and 3Marine Ecotoxicology Laboratory, AbdelmalekEssadi University, Science Faculty, B.P. 2121, Mhannech II – 93002 – Tétouan – Morocco


Brass is widely used as turbine material for cooling system for marine propellers. However, it is vulnerable to corrosion by contact of air or aqueous chloride solution. The essential oil of Myrtuscommunis (MO) was tested as a brass corrosion inhibitor (Cu70-Zn30) immersed in the 3% NaCl solution, using a polarization technique and electrochemical impedance spectroscopy. The effect of MO concentration, temperature and immersion time was studied to evaluate the action of the inhibitor. The results showed that the protection efficiency was enhanced with the increasing of MO concentration, and the potentiodynamic polarization experiment showed that MO acts essentially as a cathodic inhibitor. In addition, experiments have shown that MO inhibition efficiency decreases with increasing immersion time and temperature. The film adsorbed on the brass surface containing MO was confirmed by the results of the Scanning Electron Microscope (SEM) and the Energy Dispersive X-ray (EDX). The overall results affirmed the potential use of MO as inhibitor agent of brass corrosion in the 3% NaCl solution.

Keywords: Brass, Electrochemical impedance spectroscopy (EIS), Polarization, 3% NaCl solution, Myrtus Oil, SEM-EDX.