Olaitan Lukman Akanji
Tshwane University of Technology, South Africa
Title: Electrochemical assessment of ammonium benzoate as corrosion inhibitor of mild steel in 0.5M HCl solution: Grey relational model approach
Biography
Biography: Olaitan Lukman Akanji
Abstract
Surface deterioration by corrosion is one of the complications associated with ageing facilities and components especially under some service environments. Studies involving performance of corrosion inhibitors had been identified as one of the critical research needs for improving the durability of mild steel used in various industrial applications. This paper investigates the inhibiting effect of ammonium benzoate against the corrosion of mild steel in 0.5 M HCl. The steel samples were cut to corrosion coupons, and immersed in 0.5 M HCl at 30 oC and the corrosion behavior was investigated using weight loss and electrochemical techniques. The microstructures of the developed thin films and uncoated samples were characterized by optical microscope (OM) and scanning electron microscope (SEM/EDS). X-ray diffractometer (XRD) was used to identify the phases present. Results of the study revealed that the compound (at 2 % v/v concentration) performed effectively giving a maximum inhibition efficiency of ~ 80 %. The adsorption of the inhibitor on the mild steel surface was found to obey Temkin’s adsorption isotherm. SEM observation confirmed the existence of an absorbed protective film on the metal surface. Grey Relational Model [GRA] was used for the optimization of the experimental parameters as the processing parameters played an important role in the quality of protective film produced. The optimal values obtained by the model were validated by experimental results.