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Navegando Artigos por Assunto "Acidic medium"

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    Evaluation of efficiency of avocado seed powder (persea americana) as a corrosion inhibitor in SAE 1008 carbon steel in acidic medium.
    (2020-10-05) JESUS, MARIA EDUARDA SANTOS DE; SANTOS, ANDRÉ DE MENDONÇA; TOKUMOTO, MIRIAM SANAE; COTTING, FERNANDO; Isabella Aquino; CAPELOSSI, VERA ROSA
    Having in mind that the synthetic inhibitors, currently used to prevent corrosion are aggressive to the environment, natural inhibitors, might be a valid alternative and an innovative solution to this problem, due to its low cost, sustainability and its eco-friendly profile. In this work, a study was carried out on the evaluation of efficiency of avocado seed powder (Persea Americana) as inhibitor on the corrosion of SAE 1008 carbon steel in acidic medium (HCl 0.5 mol.L-1 ). The avocado seed powder was obtained from milling and sieving at 170 mesh. Different concentrations (0.44 g L- 1 ; 0.77 g L-1 ; 1.11 g L-1 ; 1.44 g L-1 ; 1.77 g L-1 ) of avocado seed powder were added in HCl solution. The efficiency of the inhibitor was measured by electrochemical techniques, such as electrochemical impedance spectroscopy (EIS) and poteciodynimic polarization curves, as well as gravimetric tests. The chemical characterization of the inhibitor was performed by Fourier transform infrared spectroscopy (FTIR), while the morphological characterization was obtained by optical microscopy. The FTIR characterization reveals the presence of compounds formed by heteroatoms such as nitrogen and oxygen in functional groups know to prevent the corrosion process. The results provided by these tests showed that the tendency of this inhibitor is to increase the corrosion resistance as the concentration of the inhibitor also increases, revealing that the inhibitor is a promising alternative when it comes to avoiding corrosive processes on the surface of the SAE 1008 carbon steel.