Application of Senecio Inaequidens Essential Oil and Its Fractions as Eco-friendly Inhibitors of Mild Steel Corrosion in 1M HCl Solution

• Published in: International journal of electrochemical science Vol. 8; no. 10; pp. 11896 - 11915
• Main Authors: Andreani, S., Znini, M., Paolini, Majidi, L., Hammouti, B., Costa, J., Muselli, A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2013
• Subjects: Adsorption; Corrosion Inhibition; Essential oil; Mild steel; Senecio inaequidens; Senecio inaequidens; Essential oil; Mild steel; Adsorption; Corrosion Inhibition
• ISSN: 1452-3981; 1452-3981
• DOI: 10.1016/S1452-3981(23)13230-5

The chemical composition of Senecio inaequidens essential oil was investigated for the first time using Gas chromatography (GC), Gas chromatography/Mass spectrometry (GC/MS) and Nuclear Magnetic Resonance (NMR) after column chromatography (CC). Sixty components accounting for 98.8 % of the oil were identified. Among them, myrcene (21.4 %), (Z)-β-ocimene (17.6 %), α-pinene (12.5 %), limonene (8.1 %) and cacalohastine (6.8 %) are the main components. The inhibitions of the corrosion of mild steel in Hydrochloric acid solution by S. inaequidens essential oil and its CC-fractions have been studied using weight loss measurements. All samples showed promising anticorrossive activity against mild steel in 1M HCl. Inhibition was found to increase with increasing concentration of all samples to attain 90.56 %, 82.54 %, 86.54 % and 87.14 % at 2g/L for S. inaequidens oil, hydrocarbon fraction (HF) and oxygenated fractions (OF and OF1), respectively. The effect of temperature on the corrosion behavior of mild steel in 1 M HCl without and with the S. inaequidens essential oil at 2 g/L was also studied. The inhibition was assumed to occur via adsorption of the inhibitor molecules on the mild steel surface according to the Langmuir adsorption isotherm. The thermodynamic parameters for activation and adsorption processes were calculated and discussed. The results obtained showed that the S. inaequidens essential oil could serve as an environmentally inhibitor of the corrosion of mild steel in Hydrochloric acid media.