Abstract

RAJENDRAN, S. et al. Corrosion Behaviour of Aluminium in the Presence of an Aqueous Extract of Hibiscus Rosa-sinensis. Port. Electrochim. Acta [online]. 2009, vol.27, n.2, pp.153-164. ISSN 0872-1904.

The inhibition efficiency (IE) of an aqueous extract of Hibiscus rosa-sinensis (white) in controlling corrosion of aluminium at pH 12 has been evaluated by weight loss method in the absence and presence of Zn²⁺. The formulation consisting of 8 mL flower extract (FE) and 50 ppm of Zn²⁺ had 98% inhibition efficiency. Polarization study revealed that this formulation functioned as cathodic inhibitor. AC impedance spectra revealed the presence of a protective film formed on the metal surface. FTIR spectra revealed that the protective film consisted of a complex formed between the active principle of the flower extract and Al³⁺.

Keywords : corrosion inhibition; aluminium; Hibiscus Rosa-sinensis; plant extract; environmental friendly inhibitor.

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