Estudio comparativo de tres oxazolinas como inhibidores

A comparative study about the possible inhibitor effect on atmospheric conditions of three compound 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-4,4dihydroximethyl-2-oxazoline; 2-heptadecenyl-4,4-bis(estearoiloximethyl)2-oxazoline, 2-heptadecenyl-4,4-dihydroximethyl-2-oxazoline. Oxazolines were disolved in basic oil at 70C at different concentrations. These concentrations were taken keeping in mind the previous results. AISI 1020 steel was used as electrodes. Several test methods were used: accelerated (neutral salt spray chamber, SO2 atmosphere, heat-humidity chamber) and electrochemical (polarization curves, electrochemical impedance curve and potential vs time). The results show that 2-heptadecenyl-4,4dihydroximethyl-2-oxazoline at 1.0% in weight, have better properties as corrosion inhibitor of AISI-1020 steel. These is due because the oxazoline group and two hydroxi-methyl groups are able to make a passive film by adsorption of the compounds on the metal surface, this effect is reinforced with the hydrocarbon chain oriented toward the aqueous phase. The covering and water-repellent characteristics of the film ensure protection against corrosion.