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

 

S. Rajendran, ^1,* J. Jeyasundari,¹ P. Usha,¹ J. A. Selvi,¹ B. Narayanasamy,² A. P. P. Regis,³ P. Rengan⁴

 

¹Corrosion Research Centre, Department of Chemistry, GTN Arts College, Dindigul -624005, India

²Department of Chemistry, Thiagarajar College of Engineering, Madurai, India

³Department of Chemistry, St. Joseph’s College, Trichy, India

⁴Department of Chemistry, Yadava College (Co-Education), Madurai, India

 

Received 9 October 2008; accepted 16 February 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 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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* Corresponding author. E-mail address: srmjoany@sify.com