N-((4-Chlorophenyl)(morpholin-4-yl)methyl)acetamide as corrosion inhibitor for mild steel in hydrochloric acid medium

The inhibiting effect and adsorption behavior of N-[(4-chlorophenyl)(morpholin-4-yl)methyl]acetamide (CPMA) on mild steel in hydrochloric acid solution were studied by weight loss measurements, effect of temperature studies, potentiodynamic polarization and scanning electron microscopic techniques. The inhibitor showed greater than 89 % 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 CPMA at the mild steel/hydrochloric 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 CPMA molecule on the mild steel surface. The protective film formation against the acid attack is confirmed by SEM.

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