Estudio comparativo de tres oxazolinas como inhibidores de la corrosion (11 parte).

Abstract

A comparative study about the possible inhibitor effect on atmospberic conditions of three compound of the family of 2-oxazoline
using modero electrochemical techniques was carried out. These compounds were obtained through non conventional cbemical synthesis using microwaves. The compounds studied were 2-bencyl-4,4-dibydroximethyl-2-oxazoline; 2-heptadecenyl-4,4-bis(estearoiloximethyl)-2-oxazoline, 2-heptadecenyl-4,4-dibydroximethyl-2-oxazoline. Oxazolines were disolved in basic oil at 70ºC at different concentrations. These concentrations were taken keeping in mind the ¡Ítevious results. AISI 1020 steel \.Vas used as electrodes. Several test methods were used: accelerated (neutral salt spray chamber, S02 atmosphere, heat-humidity chamber)
and electrochemical (polarization curves, electrochemica1 impedance curve and potential vs time). The results show that 2-heptadccenvl-4 4-dibydroximethyl-2-oxazoline at l .0% in weight, have better properties as corrosion inhibitor of AISI-1020 steel.
These is due because the oxazoline group ai1d t'wo 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-repellen! characteristics of the film ensure protection against corrosion.