Abstract

ALVAREZ-MANZO, Rodolfo; MENDOZA-CANALES, Joel; CASTILLO-CERVANTES, Salvador  and  MARIN-CRUZ, Jesús. Studies on the Development of New Efficient Corrosion Inhibitors for Crude Oil Pipelines: Electrochemical Impedance Spectroscopy Results for 1,8-Naphthyridines. J. Mex. Chem. Soc [online]. 2013, vol.57, n.1, pp.30-35. ISSN 1870-249X.

Five 1,8-naphthyridines were tested as corrosion inhibitors, including three non-previously reported 3-alkyl-1,8-naphthyridines. All were produced via the extended Friedländer synthesis, that for 3-alkyl-1,8-naphthyridines involves the earliest use of aliphatic aldehydes. Fragmentation pattern in MS for 3-alkyl-1,8-naphthyridines shows a remarkable parallel with that exhibited by 3-alkylpyridines. Electrochemical Impedance Spectroscopy (EIS) was used to assess the inhibiting properties of these compounds on samples of API X52 carbon steel pipelines immersed in oilfield-related water. Except for one of the molecules tested, the inhibition efficiency (IE%) values were significantly higher than that calculated for a reference commercial inhibitor.

Keywords : 1,8-Naphthyridines; corrosion inhibitor; Friedländer synthesis; electrochemical impedance spectroscopy; inhibition efficiency.

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