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Research Article

ECB. 2018; 7(12): 337-344


KINETICS AND THERMODYNAMICS OF THE CORROSION OF MILD STEEL IN THE PRESENCE OF EUPHOBIA TIRUCALLI GUMS

Habibat Faith Chahul, Elijah Maji, Rufus Shaato.




Abstract

Understanding the mechanism of corrosion of steel in acidic environments along with the accompanying quest for corrosion inhibitors that are nontoxic to the environment is of significant industrial concern. This work sets to investigate the corrosion of mild steel in 1.0 M solution of HCl in the presence of Euphobia tirucalli gums (ET) using weight loss and linear polarization measurements. The study was carried out within the inhibitor concentration range of 0.2-1.0 g L-1 and at the temperature range of 303 - 333 K. From the results obtained, it was observed that ET gums inhibited the dissolution of mild steel in the acid medium. Thermodynamic parameters obtained from the studies revealed the corrosion inhibition process to be spontaneous, exothermic and physisorptive. The adsorption of ET gums on the steel surface aligned well with the Langmuir, Freundlich and Temkin isotherm models. Linear polarization results revealed that ET functioned as a mixed-type inhibitor by inhibiting both the cathodic and anodic reactions on the mild steel surface.

Key words: Euphobia tirucalli, adsorption isotherm, activation energy, corrosion inhibition






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