Electrochemical and surface analytical studies of carbon steel protected from corrosion in a low-chloride environment containing a phosphonate-based inhibitor

Electrochemical and surface analytical studies of carbon steel protected from corrosion in a... Electrochemical and surface analytical techniques have been used to study carbon steel protected from corrosion by use of a new ternary inhibitor formulation containing nitrilotris(methylenephosphonic acid) (NTMP), zinc ions, and nicotinic acid (NA). Potentiodynamic polarization studies indicate that the ternary inhibitor acts as a mixed-type inhibitor. Electrochemical impedance studies imply formation of a protective film at the metal–solution interface. Surface analysis by X-ray photoelectron spectroscopy (XPS) showed that the protective surface film contains Fe, Zn, P, N, C, and O. On the basis of shifts in the binding energies of these elements, it is inferred that the protective film comprises a multiligand complex, Fe(III), Zn(II)–NTMP–NA, Zn(OH)2, and smaller quantities of oxides and/or hydroxides of iron. Analysis of the protective film by Fourier-transform infrared spectroscopy also supports this interpretation of the XPS results. Surface morphology and topography were studied by scanning electron microscopy and atomic force microscopy, respectively. On the basis of the results from all these studies, a plausible mechanism for inhibition of corrosion by the formulation is proposed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Electrochemical and surface analytical studies of carbon steel protected from corrosion in a low-chloride environment containing a phosphonate-based inhibitor

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Publisher
Springer Netherlands
Copyright
Copyright © 2014 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-014-1584-y
Publisher site
See Article on Publisher Site

Abstract

Electrochemical and surface analytical techniques have been used to study carbon steel protected from corrosion by use of a new ternary inhibitor formulation containing nitrilotris(methylenephosphonic acid) (NTMP), zinc ions, and nicotinic acid (NA). Potentiodynamic polarization studies indicate that the ternary inhibitor acts as a mixed-type inhibitor. Electrochemical impedance studies imply formation of a protective film at the metal–solution interface. Surface analysis by X-ray photoelectron spectroscopy (XPS) showed that the protective surface film contains Fe, Zn, P, N, C, and O. On the basis of shifts in the binding energies of these elements, it is inferred that the protective film comprises a multiligand complex, Fe(III), Zn(II)–NTMP–NA, Zn(OH)2, and smaller quantities of oxides and/or hydroxides of iron. Analysis of the protective film by Fourier-transform infrared spectroscopy also supports this interpretation of the XPS results. Surface morphology and topography were studied by scanning electron microscopy and atomic force microscopy, respectively. On the basis of the results from all these studies, a plausible mechanism for inhibition of corrosion by the formulation is proposed.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Mar 25, 2014

References

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