%0 Journal Article
%T Corrosion Inhibition by an Aqueous Extract of Phyllanthus Amarus
%A M. Sangeetha
%A S. Rajendran
%A J. Sathiyabama
%A A. Krishnaveni
%J Portugaliae Electrochimica Acta
%D 2011
%I Sociedade Portuguesa de Electroqu¨ªmica
%X The inhibition efficiency (IE) of phyllanthus amarus extract (PAE)-Zn2+ system, in controlling corrosion of carbon steel in an aqueous solution containing 60 ppm of Cl-, has been evaluated by weight loss method. Weight loss study reveals that the formulation consisting of 2 mL of PAE and 25 ppm of Zn2+ has 98% inhibition efficiency in controlling corrosion of carbon steel immersed in an aqueous solution containing 60 ppm of Cl-. Synergistic parameters suggest that a synergistic effect exists between PAE and Zn2+. Polarization study reveals that this system functions as mixed type of inhibitor controlling the cathodic reaction and anodic reaction to an equal extend. AC impedance spectra reveal that a protective film is formed on the metal surface. The FTIR spectra reveal that the protective film consists of Fe2+-phyllanthus complex.
%K corrosion inhibition
%K carbon steel
%K green inhibitor
%K environmentally friendly inhibitor
%K phyllanthus amarus
%U http://www.scielo.oces.mctes.pt/scielo.php?script=sci_arttext&pid=S0872-19042011000600005