Corrosion inhibition of mildsteel in 1 M HCl solution by Artemisia Abrotanum essential oil as an eco-friendly inhibitor

In this study, the corrosion inhibition properties of the Artemisia Abrotanum Essential Oil (AAEO) on mild steel surface in 1 M HCl solution has been investigated using Gas Chromatography-Mass Spectrometry (GC-MS), weight loss, Tafel polarization, Linear Polarization Resistance (LPR), Electrochemical Impedance Spectroscopy (EIS) and Scanning Electron Microscope (SEM) techniques. The effect of acid concentration and temperature on the corrosion behaviour of mild steel in 1 M HCl with addition of essential oilwas also studied. The obtained results indicated that AAEO has a good inhibiting effect. The protection efficiency increases with increasing AAEO concentration reaches up to 83.9 %. However, the inhibition efficiency of essential oil slightly decreases with the rise of temperature. Tafel polarization examination indicated that AAEO acts as a mixed type inhibitor with predominance anodic action. The Nyquist impedance plots presented a depressed capacitive loop at high-frequency range followed by a well-defined inductive loop at low-frequency range. However,the Nyquist plots were analyzed by fitting the experimental data to an appropriate equivalent circuit. The adsorption of AAEO on mild steel surface obeyed to Langmuir isotherm model. SEM micrographs confirmed the existence of a protective adsorbed film on the mild steel surface.