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Abstract:

The modification of passive iron electrodes by chromate ion has been studied in three different electrochemical experiments: potentiostatic passivation, open-circuit passivation, and cyclic potential treatment. XPS surface composition and composition-depth profiles obtained by argon ion-sputtering of the modified electrodes show different patterns depending on the electrochemical treatment. Two electrokinetic pathways for the reduction of chromate associated with the different chromium concentration profiles in the film are also apparent and have been related to the reductive precipitation of hydrous Cr(III) species, and to the chromium redox centers entrapped in the passive layer. The latter permanent modification of the passive layer is only obtained by repetitive oxidation-reduction cycles of iron in alkaline chromate and has similarities with passive layers on Fe-Cr alloys. © 1988, The Electrochemical Society, Inc. All rights reserved.

Registro:

Documento: Artículo
Título:XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes
Autor:Calve, E.J.; Pallotta, C.D.
Filiación:Permanent Research Staff of the Argentine Science & Technology Research Council, Sector Electroquimica Apticada, Instituto Nacional de Tecnologia Industrial, c.c. 157, San Martin, 1650 Buenos Aires, Argentina
Departamento de Quimica Inorganica, Analitica y Fisicoquimica, Facultad de Ciencias Exactas y Naturales, UBA, Ciudad Universitaria, Pab II, 1428, Buenos Aires, Argentina
Departamento de Materiales, Gerencia de Desarrollo, Comision Nacional de Energia Atomica, .Avenida Libertador 8250, 1429, Buenos Aires, Argentina
Palabras clave:CHEMICAL REACTIONS - Redox; CHROMIUM AND ALLOYS; IRON AND ALLOYS - surfaces; SPECTROSCOPY, ELECTRON - Applications; SURFACES - Spectroscopic Analysis; CHROMATE; CONCENTRATION DEPTH PROFILES; ELECTROKINETIC PATHWAYS; PASSIVATING LAYERS; ELECTRODES
Año:1988
Volumen:135
Número:2
Página de inicio:314
Página de fin:320
DOI: http://dx.doi.org/10.1149/1.2095607
Título revista:Journal of the Electrochemical Society
Título revista abreviado:J Electrochem Soc
ISSN:00134651
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134651_v135_n2_p314_Calve

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Citas:

---------- APA ----------
Calve, E.J. & Pallotta, C.D. (1988) . XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes. Journal of the Electrochemical Society, 135(2), 314-320.
http://dx.doi.org/10.1149/1.2095607
---------- CHICAGO ----------
Calve, E.J., Pallotta, C.D. "XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes" . Journal of the Electrochemical Society 135, no. 2 (1988) : 314-320.
http://dx.doi.org/10.1149/1.2095607
---------- MLA ----------
Calve, E.J., Pallotta, C.D. "XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes" . Journal of the Electrochemical Society, vol. 135, no. 2, 1988, pp. 314-320.
http://dx.doi.org/10.1149/1.2095607
---------- VANCOUVER ----------
Calve, E.J., Pallotta, C.D. XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes. J Electrochem Soc. 1988;135(2):314-320.
http://dx.doi.org/10.1149/1.2095607