XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes

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 o...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Calve, E.J., Pallotta, C.D.
Formato: JOUR
Materias:
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00134651_v135_n2_p314_Calve
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00134651_v135_n2_p314_Calve
record_format dspace
spelling todo:paper_00134651_v135_n2_p314_Calve2023-10-03T14:10:43Z XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes Calve, E.J. Pallotta, C.D. 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 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. Fil:Pallotta, C.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00134651_v135_n2_p314_Calve
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic 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
spellingShingle 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
Calve, E.J.
Pallotta, C.D.
XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes
topic_facet 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
description 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.
format JOUR
author Calve, E.J.
Pallotta, C.D.
author_facet Calve, E.J.
Pallotta, C.D.
author_sort Calve, E.J.
title XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes
title_short XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes
title_full XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes
title_fullStr XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes
title_full_unstemmed XPS and Electrochemical Studies of Chromium Modified Passive Iron Electrodes
title_sort xps and electrochemical studies of chromium modified passive iron electrodes
url http://hdl.handle.net/20.500.12110/paper_00134651_v135_n2_p314_Calve
work_keys_str_mv AT calveej xpsandelectrochemicalstudiesofchromiummodifiedpassiveironelectrodes
AT pallottacd xpsandelectrochemicalstudiesofchromiummodifiedpassiveironelectrodes
_version_ 1807317684636876800

Ejemplares similares