Abstract
The inhibiting effect and adsorption behavior of N-[(4-chlorophenyl)(morpholin-4-yl)methyl]benzamide (CPMB) on mild steel in sulphuric acid solution were studied by weight loss measurements, effect of temperature studies, potentiodynamic polarization and scanning electron microscopic techniques. The inhibitor showed greater than 90 % inhibition efficiency at 0.01 M. Potentiodynamic polarization studies showed that the inhibition action is concentration dependent, at low concentration anodic, higher concentration cathodic, inhibition predominant. The adsorption process of CPMB at the mild steel/sulphuric acid solution interface is described by Temkin’s adsorption isotherm model. The negative value of standard free energy of adsorption in the presence of inhibitor suggests spontaneous adsorption of CPMB molecule on the mild steel surface. The protective film formation against the acid attack is confirmed by SEM.
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