Study of Anticorrosive Action and Synthesis of 2-(Phenoxymethyl)-5-p-tolyl- 1,3,4-oxadiazole in 1 M Hydrochloric Acid Medium for Mild Steel

Oxadiazole derivative 2-(phenoxymethyl)-5-p-tolyl-1,3,4-oxadiazole (2POM5PTO) was prepared by condensation of phenoxymethyl hydrazine with p-tolualdehyde. Further tested as corrosion inhibitor for mild steel via electrochemical methods, potentiodynamic polarization (PDP) and gravimetric experiments. An increasing trend in inhibition efficiency has been seen on raising the concentration of 2POM5PTO. PDP technique reveals the mixed-type inhibitor behaviour of 2POM5PTO. The depressed semicircular Nyquist plot explains that the charge transfer resistance increased with inhibitor concentration while double-layer capacitance (Cdl) decreased. The surface elucidation was done by scanning electron microscopy. The studied inhibitor obeys the Langmuir adsorption isotherm.