ESTUDO DA RESISTÊNCIA A CORROSÃO DO AÇO CARBONO EM MEIO MICROEMULSIONADO COM BIODIESEL DE BABAÇU

Abstract

The metal corrosion manifests itself in different ways, however, the environment in which it occurs most often is aqueous. In between the mechanism of electrochemical corrosion is essentially. Considering that microemulsions containing pure Biodiesel and mixtures thereof, the water-in-oil (W/O) or oil in water (O/W), have higher electrical conductivity and lower viscosity, it may be possible to obtain electrochemical data of these systems. Thus, the paper aims to study the corrosion resistance of carbon steel in the presence of three micromeulsionados systems (EMS's) rightly C / T = 2, containing CTAB as surfactant, ethanol, isopropanol and butanol as co-surfactant, Biodiesel as Babaçu oil phase and water as the aqueous phase. The corrosion of steel was conducted by electrochemical tests of the open circuit potential, electrochemical impedance spectroscopy and polarization. The electrochemical results generated data and information which have allowed the objectives proposed for this work. Regarding immersion times, the surface of 1020 carbon steel showed better corrosion protection behaviors when the microemulsion system containing butanol / CTAB was used as expressed results from the experiments of electrochemical impedance spectroscopy, This good performance of corrosion protection can be attributed to surface passivation of 1020 carbon steel due to the formation of a film, ensuring a good resistance to corrosion of carbon steel.