Stochastic and deterministic behaviours of 316 stainless steel pitting corrosion in phosphate-borate buffer containing sodium chloride

The pitting corrosion of 316 stainless steel (SS) in phosphate-borate buffer (pH 8.00) containing 0.5 M NaCl at 25°C is studied through current transients run under a constant potential step, potentiodynamic runs and scanning electron microscopy. According to the potential and time windows different...

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Autores principales: Salvarezza, Roberto Carlos, De Cristofaro, N., Pallotta, C., Arvia, Alejandro Jorge
Formato: Articulo
Lenguaje:Inglés
Publicado: 1987
Materias:
Ciencias Exactas
Química
Stainless steel
SEM observations
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/122461
https://www.sciencedirect.com/science/article/abs/pii/0013468687900326
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-122461
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
Stainless steel
SEM observations
spellingShingle Ciencias Exactas
Química
Stainless steel
SEM observations
Salvarezza, Roberto Carlos
De Cristofaro, N.
Pallotta, C.
Arvia, Alejandro Jorge
Stochastic and deterministic behaviours of 316 stainless steel pitting corrosion in phosphate-borate buffer containing sodium chloride
topic_facet Ciencias Exactas
Química
Stainless steel
SEM observations
description The pitting corrosion of 316 stainless steel (SS) in phosphate-borate buffer (pH 8.00) containing 0.5 M NaCl at 25°C is studied through current transients run under a constant potential step, potentiodynamic runs and scanning electron microscopy. According to the potential and time windows different laws for pitting kinetics are observed. For small number of pits, the kinetics of pit growth is governed by a stochastic law whereas for a large number of pits a deterministic law which corresponds to an instantaneous nucleation and growth is obeyed. At the initial stages two different rate constants for pit nucleation are obtained. This fact correlates with two well distinguishable types of pits observed through SEM observations. Results are discussed through a model involving the penetration of chloride ions through the passive film and the existence of at least two types of sites at the metal surface which in turn become centers of pit nucleation. Pit stability is directly related to the Cr(III) content in the passive layer which can be shifted by changing the applied potential with respect to that of the Cr<sub>2</sub>O<sub>3</sub>/CrO<sup>2−</sup><sub>4</sub> redox couple.
format Articulo
Articulo
author Salvarezza, Roberto Carlos
De Cristofaro, N.
Pallotta, C.
Arvia, Alejandro Jorge
author_facet Salvarezza, Roberto Carlos
De Cristofaro, N.
Pallotta, C.
Arvia, Alejandro Jorge
author_sort Salvarezza, Roberto Carlos
title Stochastic and deterministic behaviours of 316 stainless steel pitting corrosion in phosphate-borate buffer containing sodium chloride
title_short Stochastic and deterministic behaviours of 316 stainless steel pitting corrosion in phosphate-borate buffer containing sodium chloride
title_full Stochastic and deterministic behaviours of 316 stainless steel pitting corrosion in phosphate-borate buffer containing sodium chloride
title_fullStr Stochastic and deterministic behaviours of 316 stainless steel pitting corrosion in phosphate-borate buffer containing sodium chloride
title_full_unstemmed Stochastic and deterministic behaviours of 316 stainless steel pitting corrosion in phosphate-borate buffer containing sodium chloride
title_sort stochastic and deterministic behaviours of 316 stainless steel pitting corrosion in phosphate-borate buffer containing sodium chloride
publishDate 1987
url http://sedici.unlp.edu.ar/handle/10915/122461
https://www.sciencedirect.com/science/article/abs/pii/0013468687900326
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