The transformation of rust in the presence of 5 g L−1 tannins extracted from mangrove barks was studied. Pre-rusted samples prepared resulted in the formation of predominantly lepidocrocite and magnetite. Partial transformation of rust components, particularly lepidocrocite in the presence of mangrove tannins was found to occur when observed via infrared spectroscopy, X-ray diffraction and SEM analysis. The anti-corrosive properties of the mangrove bark extracts seem to be related to the tannins which are capable of chelating with Fe 3+ giving a highly stable, and insoluble ferric-tannate complexes. A molecular modeling study of the reaction of catechin, a flavanoid of mangrove tannins with Fe 3+ to form a ferric-tannate complex was performed to explain the adsorption mechanism of tannins on iron. The correlation between the electronic density of the catechin molecule and the inhibiting properties is reported.
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Rahim, A.A., Musa, N.H., Adnan, R., Kassim, M.J., Rocca, E., Steinmetz, J. (2009). Rust Phase Transformation in the Presence of Mangrove Tannins. In: Şener, B. (eds) Innovations in Chemical Biology. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6955-0_19
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