Inhibition of corrosion of mild steel by Phenyl thiosemicarbazides of nontraditional oils

Abstract

Thiosemicarbazide of phenyl hydrazides of fatty acids from nontraditional oils (neem, rice bran and karanja) have been synthesized and evaluated as corrosion inhibitors for mild steel (MS) in hydrochloric acid (HCl) solution by weight loss method. Adsorption of all phenyl hydrazides derivatives on MS surface in acid solution obeyed Langmuir’s adsorption isotherm. Inhibition efficiency of these compounds increases with increase in concentration of the compound, and vary with solution temperature, immersion time and concentration of acid solution. Activation energies (Ea) have been calculated to investigate mechanism of corrosion inhibition.