CYCLIC VOLTAMMETRIC STUDY OF PROTECTIVE FILM FORMED BY 2-CARBOXYETHYLPHOSPHONIC ACID - NI2+ SYSTEM ON CARBON STEEL

K Kavipriya, J. Sathiyabama, S. Rajendran

Abstract


The corrosion inhibition effect of carbon steel in sea water by 2-carboxyethylphosphonic acid (2-CEPA) and Ni2+ has been investigated using weight loss method and cyclic voltammetry. The results show that 73% inhibition efficiency is achieved with binary system consisting of 250 ppm of 2-CEPA and 50 ppm of Ni2+.  Surface evaluation technique like FTIR is used to determine the nature of the protective film formed on the metal surface. The protective film consists of Fe2+ – 2-CEPA complex, Ni2+ – 2-CEPA complex and Ni(OH)2. Cyclic voltammetry study reveals that the protective film is more compact and stable even in 3.5% NaCl environment.


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DOI: http://dx.doi.org/10.17628/ecb.2013.2.657-661

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