Estudo de inibidor verde à base de aroeira (Myracrodruon Urundeuva fr. Allem) no combate à corrosão do aço carbono SAE J403 1020

Abstract

The use of green inhibitors in the corrosion of SAE J403 1020 carbon steel is an economical and environmentally accessible alternative because, regarding to the commercial inhibitors generally used, they are easily obtainable, and since they are acquired from vegetables, don't represent a risk to the environment. Thus, the present work aims to evaluate the use of aroeira leaves as a corrosion inhibitor for SAE J403 1020 carbon steel, which is widely used in industry and has low corrosion resistance. The choice of aroeira was due to the fact that the plant is originated from Brazil and is abundant in the Northeast of the country, mainly in Ceará. For analysis, a corrosive medium was used: 0.1 M H2SO4, 3.5% NaCl and NaCl (pH = 4.0); the inhibitor concentrations were: 50, 200, 500 and 1000 ppm. In relation to the electrochemical techniques, Open Circuit Potential (OCP), Electrochemical Impedance Spectroscopy (EIS) and Linear Polarization Curves (CP) were used. Thus, through the analysis of the mentioned techniques, it was possible to obtain the behavior of the inhibitor in relation to the material and the medium, as well as to evaluate the best medium for the use of aroeira as a green corrosion inhibitor.