Investigation of adsorption and corrosion inhibitive properties of 5-((4-chloro-2-methylphenoxy)methyl)-1,3,4-thiadiazole-2-amine films on mild steel in HCl solution

Abstract

Adsorption of 5-((4-chloro-2-methylphenoxy)methyl)-1,3,4-thiadiazole-2-amine (CMMTA) on mild steel surface from 1 M HCl solution and its inhibition efficiency against corrosion were studied with the help of electrochemical methods. The mild steel specimens were exposed to 1 M HCl solution in the absence and presence of 1 mM CMMTA and the change of its open circuit potential as a function of exposure time (Eocp-t) was graphically monitored. Electrochemical kinetics parameters were evaluated by potentiodynamic polarization measurements. The metal-film/solution interface was investigated by electrochemical impedance spectroscopy (EIS). The resistance of the steel in the absence and presence of the inhibitor were determined from EIS and linear polarization measurements. It was found that CMMTA has great corrosion protection ability for mild steel. The high inhibition efficiency of this compound was explained by its adsorption on the metal surface and a protective film formation on the steel surface