Abstract
Natural and aromatic substances contained in plants which can be extracted by hydro-distillation or by cold extraction, more commonly known as essential oils are used today in several fields including cosmetic, perfumery, food processing, traditional medicine, agriculture etc. More recently, a strong use of these products extracted from plants as a corrosion inhibitor of metals and alloys in an acidic environment has been observed, given the number of works that have been published in recent decades. This review represents a general study on essential oils for a better understanding of these natural products, but also a non-exhaustive study of the published research works on the use of essential oils as a corrosion inhibitor of metals and alloys, in particular mild steels in acidic environments. Most of these studies have revealed great potentials of essential oils in inhibiting the corrosion of metals in aggressive environment, such as acidic environment. Thus, they have proposed alternatives to artificial metal corrosion inhibitor known to cause environmental pollution and public health issues. This review is a contribution to research efforts carried out by scientific community to find green corrosion inhibitors. It lays the basis for future research work aimed to investigate on the corrosion inhibition properties of essential oils extracted from Senegalese local plants.
Highlights
An essential oil is the concentrated, hydrophobic liquid of a plant’s volatile aromatic compounds
Omnipresent in our daily life, the use of this fragrant liquid produced by plants dates back in several millennia, because the texts relating the use of essential oils are parchments dating of more than 1500 years BC
Gas chromatography (GC): It is defined as a method of analysis by separation that applies to gaseous compounds or that may be vaporized by heating without decomposition
Summary
An essential oil is the concentrated, hydrophobic liquid of a plant’s volatile aromatic compounds. Malick Bathily et al.: Review on Essential Oils and Their Corrosion-inhibiting Properties turned to more environmentally friendly solutions such as essential oils and, other types of plant extracts Since these products are considered to be green corrosion inhibitors because of the organic compounds they contain and their anti-corrosive properties, they are increasingly used to protect metals and alloys in a more or less acidic environment [4]. This study highlights production methods, and different methods for identifying the chemical compounds of essential oils This second part focuses on the various research works carried out and published in the literature by researchers on the corrosion inhibiting properties of metals and alloys in an acid medium by essential oils
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