Corrosion Inhibition by Beet Root Extract

 

J. Arockia Selvi,¹ Susai Rajendran,^1,* V. Ganga Sri,¹ A. John Amalraj,² B. Narayanasamy³

 

¹Corrosion Research Centre, Department of Chemistry GTN Arts College, Dindigul – 624 005 - Tamil Nadu, India

²Department of Chemistry, Loyola College, Chennai, Tamil Nadu, India

³Department of Chemistry, Thiagarajar College of Engineering, Madurai, Tamil Nadu, India

 

Received 28 June 2008; accepted 30 September 2008

 

Abstract

The inhibition efficiency (IE) of an aqueous extract of beet root (BR) in controlling corrosion of carbon steel in well water in the absence and presence of Zn²⁺ has been evaluated by mass loss method.  The formulation consisting of 4 mL of BR extract and 50 ppm Zn²⁺ offers 98% inhibition efficiency to carbon steel immersed in well water.  A synergistic effect exists between BR extract and Zn²⁺.  Addition of N-Cetyl-N,N,N – trimethylammonium bromide (CTAB) does not change the excellent inhibition efficiency of the BR – Zn²⁺ system.  The BR – Zn²⁺ system shows excellent IE up to 7 days.  Polarization study reveals that this formulation controls the cathodic reaction predominantly.   AC impedance spectra reveal that a protective film is formed on the metal surface. FTIR spectra reveal that the protective film consists of Fe²⁺ - betanin complex and Zn(OH)₂.  The film is found to be UV - fluorescent.

Keywords: carbon steel, corrosion inhibition, plant extract, beet root, beta vulgaris.

 

 

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* Corresponding author. E-mail address: srmjoany@sify.com