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Portugaliae Electrochimica Acta

Print version ISSN 0872-1904

Port. Electrochim. Acta vol.27 no.2 Coimbra  2009

 

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

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