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Effect of surface conditions and strain hardening on the passivity breakdown of 304 stainless steel

Published online by Cambridge University Press:  11 April 2012

Tewfik Souier  and
Matteo Chiesa
Tewfik Souier*
Affiliation:
Laboratory for Energy and Nano Science, Masdar Institute, Abu Dhabi 54224, United Arab Emirates; and Service de Physique et Chimie des Surfaces et Interfaces, CEA Saclay, Gif-sur-yvettes 91191, France
Matteo Chiesa
Affiliation:
Laboratory for Energy and Nano Science, Masdar Institute, Abu Dhabi 54224, United Arab Emirates; and Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
*
a)Address all correspondence to this author. e-mail: tsouier@masdar.ac.ae
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Abstract

Electrical and electrochemical properties of the passive layer formed on 304L austenitic stainless steel are investigated by means of both conductive atomic force microscopy in air and electrochemical atomic force microscopy in chloride-containing media. The maps of local electrical conductivity of the oxide overlayer exhibit different patterns depending on the surface conditions after mechanical or electrochemical polishing. In particular, the passive film covering strain-hardened regions reveals a higher electrical conductivity. The local enhancement of the electrical conduction is explained by local changes of the stoichiometry of the passive film. Moreover, the highly conductive regions lead to a local breakdown of the native oxide in chloride-containing media and favor the initiation of localized pits.

Keywords

Scanning-probe microscopySteelCorrosion
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 12 , 28 June 2012 , pp. 1580 - 1588
Copyright
Copyright © Materials Research Society 2012

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