Illuminating of mild steel/HCI interface in the presence of 5-DAT inhibitor

Abstract

In this article, a novel and non-toxic Schiff base containing multi-heteroatom coded with the name 5-DAT (5-(4-(diethylamino)benzylidene)amino)-1,3,4-thiadiazole-2-thiol is designed as the corrosion inhibitor for mild steel (MS) in 1.0 M HCl. The structure of Schiff base is illuminated by NMR, FT-IR, UV spectrophotometers and theoretical (Gaussian and Monte Carlo) calculations. Electrochemical techniques were utilized to determine the inhibition effi-ciency of synthesized Schiff base on mild steel corrosion. The surface of the MS was characterized by scanning elec-tron microscopy. The inhibition talent of the 5-DAT was described by electrochemical impedance spectroscopy, lineer polarization resistance, and potentiodynamic polarization techniques. 5-DAT synthesized in this study showed high efficiency with 98.9% inhibition efficiency since it contains high electron density heteroatoms such as nitrogen, sulfur and many multiple bonds, which are considered as more adsorption centers compared to the pre-vious ones. While 5-DAT shows efficiency at 298 K, according to EIS and LPR results, respectively, 98.41, 98.12; It was observed that the efficiency was not lost much with 93.87, 92.86 efficiencies at 328 K. The presence of a 5-DAT film, which is homogeneously dispersed on the surface, protects the metal surface against corrosion