Author/Authors :
Ben Hmamou, Dris Université Ibn Zohr - Écoles nationales des sciences appliquées (ENSA) - Equipe de Génie de l Environnement et de Biotechnologie, Morocco , Salghi, Rachid Université Ibn Zohr - Écoles nationales des sciences appliquées (ENSA) - Equipe de Génie de l Environnement et de Biotechnologie, Morocco , Zarrouk, Abdelkader Université Mohammed Premier - Faculté des Sciences - LCAE-URAC18, Morocco , Benali, Omar Université Dr. Tahar, Moulay - Faculté des Sciences et de la Technologie - Départment de Biologie, Algeria , Fadel, Fatiha Université Mohammed Premier - Faculté des Sciences - LCAE-URAC18, Morocco , Zarrok, Hassan Faculté des Sciences - Laboratoire des Procèdesde Séparation, Morocco , Hammouti, Belkheir Université Mohammed Premier - Faculté des Sciences - LCAE-URAC18, Morocco
Abstract :
Background: The carob seed oil (CO) was tested as inhibitor of the corrosion of C38 steel in 1 M HCl by weight loss and electrochemical measurements. The extract was found to inhibit the corrosion of C38 steel in 1 M HCl. Results: The results of the study reveal that the inhibition efficiency of CO depends on its concentration and attains approximately 86.7% at 0.5 g/L. Polarization curves reveal that CO is a mixed-type inhibitor. Changes in impedance parameters (charge transfer resistance, Rt, and double-layer capacitance, Cdl) were indicative of CO adsorption on the metal surface, leading to the formation of a protective film. The effect of temperature on the corrosion behavior with the addition of 0.5 g/L of carob seed oil was studied in the temperature range of 298 to 328 K. Conclusions: Results show that the inhibition efficiency of the plant extract increases with increasing temperature, and the adsorption of the latter on the C38 steel surface is found to obey the Langmuir adsorption isotherm. Some thermodynamic functions of dissolution processes were also determined.
Keywords :
Carob seed oil , Inhibition , Corrosion , C38 steel , Adsorption
