Abstract:
There is a high demand for eco-friendly, effective, and highperformance
corrosion inhibitors for industrial applications. Thus, the corrosion
property of aluminum alloys was studied in essential oil-containing sodium chloride
solution at various concentrations. Potentiodynamic polarization, electrochemical
impedance spectroscopy (EIS), surface tests, and weight loss analysis were used to
study the corrosion inhibition mechanism of the essential oil. The essential oil
showed the highest inhibition efficiency of 97.01% at 1000 ppm. A high efficiency of
96.03% was achieved even after 168 h of exposure. The potentiodynamic polarization
test showed that the essential oil is a mixed-type inhibitor. EIS results show better
adsorption of the oil on the surface of the aluminum at increased inhibitor
concentrations. The Langmuir’s adsorption isotherm model was found to describe the
adsorption behavior. The surface morphology of the uninhibited and inhibited
specimens examined by a scanning electron microscope equipped with an energydispersive
X-ray spectroscope confirmed the protective film of the inhibitor molecules
on the aluminum surface.
