The use of essential oil of Thymus capitatus originating from North-East Morocco, as eco-friendly corrosion inhibitors of mild steel in hydrochloric acid solution

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Author: 
El Ouadi, Y., Lahhit, N., Bouyanzer, A. Elmsellem, H., Majidi, L., Znini, M., Abdel-Rahman, I., Hammouti, B., El Mahi, B. and Costa, J.
Abstract: 

Thymus Capitatus is a shrub, which is native of the Mediterranean basin. The purpose of this study was to determine the chemical composition and inhibitory effect of essential oil of Thymus Capitatus on the corrosion of mild steel in hydrochloric acid (1M).The essential oil of Thymus Capitatus has been studied using gas chromatography (GC) and GC-mass spectrometry (GC-MS). 91.2% of the components are detected (32 components) and the major components were, p-Cymene (18.9%), carvacrol (13.4%), acetate of geranyl (12.2%), borneol (10.2%), Camphene (3.9%), α-pinene (2.9%) and trans caryophyllene (2.9%).The inhibitory effect of essential oil of Thymus Capitatus was estimated on the corrosion of mild steel in 1M in Hydrochloric acid (HCl) using weight loss, Electrochemical Impedance Spectroscopy (EIS) and Tafel polarization curves. The results of the polarization curves show that the corrosion current density decreases 698μA/cm2 to 290μA/cm2 after addition of the inhibitor (essential oil of Thymus Capitatus), the charge transfer resistance increases 49 ohm.cm2 to 101 ohm.cm2 in the electrochemical impedance spectrum after addition of the inhibitor. The inhibition of the compound effect is attributed to the formation of a film on the surface of the steel.

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