Kinetics and Equilibrium Assessment of Anticorrosion Efficiency of Palm Kernel Oil as Green inhibitor on Aluminium Sheet in Acidic Medium

Abstract

Chemical industries are currently looking for environmentally friendly, reliable inhibitors to stop different metals or alloys from corroding in both acidic and basic media. Therefore, the aim of this paper was to assess the kinetic and equilibrium models of anticorrosion efficiency of palm kernel oil as green inhibitor on aluminium sheet in acidic medium using weight loss method at various concentrations of the oil (2-10 ml) and different time interval of 24 – 120 h. The oil was extracted using Soxhlet extraction method and   characterized using Fourier Transform Infrared Spectrophotometer (FTIR). The result revealed maximum inhibition efficiency of approximately 96% at 6 ml concentration of the oil and at the time interval of 24 h. The FTIR analysis showed the presence of C=C-H, Ar-H bending out of plane, C-H bending in plane, C-O, N-O asymmetric stretch, C=C stretch, C=N stretch, and O-H functional groups at various peaks (wave numbers). The adsorption of the oil extract on the surface of the test coupon obeyed Langmuir adsorption isotherm and the kinetic study of the anticorrosion process obeyed pseudo first order kinetic model. However, based on the outcome of this study, palm kernel oil is considered as an excellent corrosion inhibitor and can be used as an alternative inhibitor to replace the non-biodegradable ones.