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Portugaliae Electrochimica Acta
versão impressa ISSN 0872-1904
Resumo
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.
Palavras-chave : corrosion inhibition; carbon steel; green inhibitor; environmentally friendly inhibitor; phyllanthus amarus.