Evaluation of three oxazolines as inhibitors of corrosion by electrochemical techniques Icono de Validado por la comunidad

Abstract

A study about the possible inhibitor effect on atmospheric conditions of three compounds of the family of 2-oxazoline using modern electrochemical techniques was carried out. These compounds were obtained through non conventional chemical synthesis using microwaves. The compounds studied were: 2-bencyl-4,4-dihydroximethyl-2-oxazoline; 2-heptadicenyl-4,4-bis(estearoiloximethyl)-2-oxazoline, 2-heptadicenyl-4,4-dihydroximethyl-2-oxazoline. Oxazolines were dissolved in basic oil at 70 oC at different  concentrations. AISI 1020 was used as electrodes. Different electrochemical techniques (EIS, polarization, polarization resistance
and potential against time). The results show that two oxazoline compounds of the type are able to adsorb themselves on the metal surface. Furthermore, the higher effectivity concentration was determined. The 2-bencyl-4,4-dihydroximethyl-2-oxazoline dissolved in  basic oil at 0,2 % (w/w) does not present propierties which inhibit the corrosion process. In the case of 2-heptadicenyl-4,4-bis(estearoiloximethyl)-2-oxazoline at 2 % (w/w) an delay of the atmospheric corrosion processes is observed, while for  -heptadicenyl-4,4-dihydroximethyl-2-oxazoline, in higher concentrations than 0.75 % (w/w) a diminishing corrosion rate is observed. In the last case the action mechanism corresponds to a passivator.