Application of Essential Oils as green corrosion inhibitors for metals and alloys in different aggressive mediums
The use of inhibitors for the protection metals and alloys against corrosion in different aggressive environment is one of the best choices. In recent years, essential oils have been explored as green corrosion inhibitors because to their bio-degrability, eco-friendliness, low cost and easy availability. The inhibition performance of these natural products may be to the adsorption, by a synergistic effect, of their different phytochemical constituents including oxygenated monoterpens and sesquiterpens as well as hydrcarbons products. The inhibition effectiveness of these green corrosion inhibitors was evaluated by using numerous techniques like weight loss method, polarization study and AC impedance spectra. The protective layer (film) formed on the metal surface has been analyzed by IR spectroscopy, scanning electron microscopy coupled with EDX and X-ray photoelectron spectroscopy (XPS) techniques. This review presents most of the research work published in recent years on the use of essential oils as green corrosion inhibitors for various metals and alloys in different mediums.