Corrosion Behaviour of Aluminium in the Presence of an Aqueous Extract of Hibiscus Rosa-sinensis

Authors :: P. Rengan
J. Jeyasundari
A. P. P. Regis
Susai Rajendran
B. Narayanasamy
J. A. Selvi
P. Usha
Source :: Portugaliae Electrochimica Acta, Volume: 27, Issue: 2, Pages: 153-164, Published: 2009, Portugaliae Electrochimica Acta v.27 n.2 2009, Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos), Agência para a Sociedade do Conhecimento (UMIC)-FCT-Sociedade da Informação, instacron:RCAAP
Publication Year :: 2009
Publisher :: Portuguese Society of Electrochemistry, 2009.
Abstract: 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 Zn 2+ . The formulation consisting of 8 mL flower extract (FE) and 50 ppm of Zn 2+ 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 Al 3+ .

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