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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


VALBON, Arthur et al. HIBISCO-COLIBRI EXTRACT AS GREEN CORROSION INHIBITOR FOR CARBON STEEL IN SULFURIC ACID. Quím. Nova [online]. 2019, vol.42, n.7, pp.797-802.  Epub Aug 26, 2019. ISSN 0100-4042.

For this work, a hydroalcoholic extract was prepared from the aerial parts of the Malvaviscus arboreus (Malvaceae) species, popularly known as hibisco-colibri in Brazil; and then, investigated by infrared and NMR spectroscopy. A class of special metabolites containing a porphyrin skeleton and pyrrole units was determined by typical absorption spectra, mainly 1H and 13C NMR, thus indicating the capability of showing anti-corrosion effect. Therefore, the M. arboreus extract was examined as a corrosion inhibitor for AISI 1020 carbon steel in H2SO4 1 mol L-1, using a mass loss (gravimetric) technique. Results showed good corrosion inhibition efficiency, at both time and temperature variation. The maximum efficiency observed at 500 ppm was 97.5%, at 3 h, 24 h and 48 h. The surface morphology was analyzed by scanning electron microscopy (SEM), through which a higher homogeneity was observed in the presence of the M. arboreus extract. The hydroalcoholic extract of hibisco-colibri can be considered an efficient green agent for preventing corrosion.

Keywords : Malvaviscus arboreus; corrosion inhibitor; ecofriendly inhibitor.

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