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International Journal of Corrosion
Volume 2013 (2013), Article ID 363826, 9 pages
http://dx.doi.org/10.1155/2013/363826
Research Article

Corrosion Behaviour of a Highly Alloyed Austenitic Alloy UB6 in Contaminated Phosphoric Acid

1Laboratoire de Corrosion-Electrochimie, Faculté des Sciences, Université Mohammed V-Agdal, Rabat BP 1014, Morocco
2Ingeniería Electroquímica y Corrosión (IEC), Departamento de Ingeniería Química y Nuclear, ETSI Industriales, Universitat Politècnica de Valencia, P.O. Box 22012, 46071 Valencia, Spain

Received 8 March 2013; Revised 9 June 2013; Accepted 15 June 2013

Academic Editor: W. Ke

Copyright © 2013 M. Boudalia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The influence of temperature (20–80°C) on the electrochemical behaviour of passive films anodically formed on UB6 stainless steel in phosphoric acid solution (5.5 M H3PO4) has been examined by using potentiodynamic curves, electrochemical impedance spectroscopy, and Mott-Schottky analysis. UB6 stainless steel in contaminated phosphoric acid is characterised by high interfacial impedance, thereby, illustrating its high corrosion resistance. The obtained results show that the films behave as n-type and p-type semiconductors in the potential range above and below the flat band potential, respectively. This behaviour is assumed to be the consequence of the semiconducting properties of the iron oxide and chromium oxide regions which compose the passive film.