Abstract

SANGEETHA, M. et al. Corrosion Inhibition by an Aqueous Extract of Phyllanthus Amarus. Port. Electrochim. Acta [online]. 2011, vol.29, n.6, pp.429-444. ISSN 0872-1904.  https://doi.org/10.4152/pea.201106429.

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.

Keywords : corrosion inhibition; carbon steel; green inhibitor; environmentally friendly inhibitor; phyllanthus amarus.

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