Experimental and computational studies of naphthyridine derivatives as corrosion inhibitor for \N80\ steel in 15% hydrochloric acid
By K.R. Ansari and M.A. Quraishi
Published in Physica E: Low-dimensional Systems and Nanostructures
NULL
2015
Abstract
The inhibition effect of three naphthyridine derivatives namely 2-amino-4-(4-methoxyphenyl)-1,8-naphthyridine-3-carbonitrile (ANC-1), 2-amino-4-(4-methylphenyl)-1,8-naphthyridine-3-carbonitrile (ANC-2) and 2-amino-4-(3-nitrophenyl)-1,8-naphthyridine-3-carbonitrile (ANC-3) as corrosion inhibitors for \N80\ steel in 15% \HCl\ by using gravimetric, electrochemical techniques (EIS and potentiodynamic polarization), SEM, \EDX\ and quantum chemical calculation. The order of inhibition efficiency is ANC-1>ANC-2>ANC-3. Potentiodynamic polarization reveals that these inhibitors are mixed type with predominant cathodic control. Studied inhibitors obey the Langmuir adsorption isotherm. The quantum calculation is in good agreement with experimental results.
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