Three new thiadiazole derivatives (TDADs), namely, (I) N-[4-phenyl-5-(p-tolylimino)-4,5-dihydro-1,3,4-thiadiazole-2-yl] benzamide, (II) 2-acetyl-4-phenyl-5-(p-tolylimino)-4,5-dihydro-1,3,4- thiadiazole, and (III) Ethyl-4-phenyl-5-(p-tolylimino)-4,5-dihydro-1,3,4-thiadiazole-2-carboxylate, have been synthesized and used as additives to protect grade 1018 carbon steel from corrosion in naturally aerated 0.5 M NaCl solution ( 3% by wt.). The techniques adopted include open circuit potential (OCP), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) complemented
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