Changes in the composition of the passive layer and pitting corrosion of stainless steel in phosphate-borate buffer containing chloride ions

The influence of the passive layer properties on the pitting corrosion of 316SS was studied in phosphate-borate buffer containing chloride ions by using potential step and potentiodynamic techniques complemented with scanning electron microscopy. The increase of the anodization time in the passive r...

Descripción completa

Detalles Bibliográficos
Autor principal: Pallotta, César Daniel
Publicado: 1988
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v33_n11_p1645_Urretabizkaya
http://hdl.handle.net/20.500.12110/paper_00134686_v33_n11_p1645_Urretabizkaya
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00134686_v33_n11_p1645_Urretabizkaya
record_format dspace
spelling paper:paper_00134686_v33_n11_p1645_Urretabizkaya2023-06-08T14:35:51Z Changes in the composition of the passive layer and pitting corrosion of stainless steel in phosphate-borate buffer containing chloride ions Pallotta, César Daniel The influence of the passive layer properties on the pitting corrosion of 316SS was studied in phosphate-borate buffer containing chloride ions by using potential step and potentiodynamic techniques complemented with scanning electron microscopy. The increase of the anodization time in the passive region decreases the nucleation rate and the mean number of corrosion pits formed onthe 316SS surface. Results are explained through changes in the structure and composition of the passive layer during anodization. Two different Cr(III) species can be voltammetrically detected at short anodization times, an outer weakly bound Cr(III) species which is electroaoxidized to soluble CrO42- and an inner Cr(III) species which is electrooxidized to Cr(VI) but retained in the film at potentials lying in the transpassive region. As the anodization time in the passive region increases, the weakly bound Cr(III) species is transformed into another more stable one, probably an iron chromite, which exhibits an electooxidation potential more positive than that of Cr(III) species. The aged passive layer becomes more resistant to pit initiation, due to either a decrease in the density of active sites or a decrease in the nucleation rate constant for pit initiation. © 1988. Fil:Pallotta, C.D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1988 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v33_n11_p1645_Urretabizkaya http://hdl.handle.net/20.500.12110/paper_00134686_v33_n11_p1645_Urretabizkaya
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The influence of the passive layer properties on the pitting corrosion of 316SS was studied in phosphate-borate buffer containing chloride ions by using potential step and potentiodynamic techniques complemented with scanning electron microscopy. The increase of the anodization time in the passive region decreases the nucleation rate and the mean number of corrosion pits formed onthe 316SS surface. Results are explained through changes in the structure and composition of the passive layer during anodization. Two different Cr(III) species can be voltammetrically detected at short anodization times, an outer weakly bound Cr(III) species which is electroaoxidized to soluble CrO42- and an inner Cr(III) species which is electrooxidized to Cr(VI) but retained in the film at potentials lying in the transpassive region. As the anodization time in the passive region increases, the weakly bound Cr(III) species is transformed into another more stable one, probably an iron chromite, which exhibits an electooxidation potential more positive than that of Cr(III) species. The aged passive layer becomes more resistant to pit initiation, due to either a decrease in the density of active sites or a decrease in the nucleation rate constant for pit initiation. © 1988.
author Pallotta, César Daniel
spellingShingle Pallotta, César Daniel
Changes in the composition of the passive layer and pitting corrosion of stainless steel in phosphate-borate buffer containing chloride ions
author_facet Pallotta, César Daniel
author_sort Pallotta, César Daniel
title Changes in the composition of the passive layer and pitting corrosion of stainless steel in phosphate-borate buffer containing chloride ions
title_short Changes in the composition of the passive layer and pitting corrosion of stainless steel in phosphate-borate buffer containing chloride ions
title_full Changes in the composition of the passive layer and pitting corrosion of stainless steel in phosphate-borate buffer containing chloride ions
title_fullStr Changes in the composition of the passive layer and pitting corrosion of stainless steel in phosphate-borate buffer containing chloride ions
title_full_unstemmed Changes in the composition of the passive layer and pitting corrosion of stainless steel in phosphate-borate buffer containing chloride ions
title_sort changes in the composition of the passive layer and pitting corrosion of stainless steel in phosphate-borate buffer containing chloride ions
publishDate 1988
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00134686_v33_n11_p1645_Urretabizkaya
http://hdl.handle.net/20.500.12110/paper_00134686_v33_n11_p1645_Urretabizkaya
work_keys_str_mv AT pallottacesardaniel changesinthecompositionofthepassivelayerandpittingcorrosionofstainlesssteelinphosphateboratebuffercontainingchlorideions
_version_ 1768542580907180032

Ejemplares similares