Juniperus Phoenicea essential oil as green corrosion inhibitor for mild steel in molar hydrochloric acid

¹ Laboratoire de Biotechnologie, Environnement et Qualité, Université Ibn Tofail, Faculté des Sciences, Kénitra, Maroc
² Laboratoire d’Ingénierie des Matériaux et d’Environnement : Modélisation et Application, Faculté des Sciences, Université Ibn Tofail, BP 133, Kénitra 14 000, Morocco
³ Laboratoire de Synthèse Organique et Procédés d’Extraction. Université Ibn Tofail, Faculté des Sciences Kénitra, Maroc
⁴ Laboratoire d’Ingénierie des Matériaux, de Modélisation et d’Environnement, LIMME, Faculté des Sciences Dhar El Mahraz, Université Sidi Mohammed Ben Abdellah, USMBA, BP 1796 -- 30000, Atlas -- Fès, Morocco
⁵ Laboratoire de Chimie des Plantes Aromatiques et Médicinales et de Microbiologie. Centre de recherche forestière, BP 763, Agdal Rabat, Maroc
⁶ Centre Régional des Métiers de l’Education et de la Formation (CRMEF), Avenue Allal Al Fassi, Madinat Al Irfane, BP 6210 Rabat, Morocco

^a Corresponding author: touir8@yahoo.fr

Received: 4 February 2016
Accepted: 16 January 2017

Abstract

Juniperus Phoenicea Essential Oil (JPEO) was obtained by hydro-distillation and characterized using Gas Chromatography Electronic (GC). It is found that major component was α-pinene (89.31%). In addition, this compound was investigated as green corrosion inhibitor of mild steel in 1.0 M HCl using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The polarization measurements showed that JPEO acts as mixed-type inhibitor and its inhibition efficiency increased with concentration to reach 88.3% at 250 ppm. This result was confirmed the EIS. The influences of temperature and immersion time were also studied in the range from 298 to 328 K and up to 12 h, respectively. The kinetic and thermodynamic data of activation dissolution process were determined and discussed.