Published March 1975 | Version v1
Journal article Metadata-only

Study of passive films formed on stainless steel surfaces, using Auger spectroscopy

Creators

  • 1. Centre National de la Recherche Scientifique, 94 - Vitry-sur-Seine (France). Centre d'Etudes de Chimie Metallurgique

Description

This paper deals with the characterization of passive films formed on stainless steel (26% Cr and 0 to 3%Mo). The influence of the applied passivation potential and the effect of molybdenum additions to steel upon the composition profiles of passive films formed in an aqueous NaCl solution (3.5% at pH 2.5) are studied. The technique involved is Auger electron spectroscopy combined with ion sputtering. Some electrochemical techniques have been used in conjunction. A quantitative approach of the Auger spectra during the progressive removal of the passive film is described. The peak-to-peak height of the Auger lines are treated in order to yield the atomic fraction of the various elements present in a given subsurface layer. The analytical study of the film by electron spectroscopy indicates that molybdenum plays a part at the metal-oxide interface where this element acts on the chromium diffusion process. This phenomenon, which depends on the imposed potential, may lead to the formation of sublayers having a very low current efficiency in cathodic reduction measurements. The informations obtained by Auger spectroscopy are confirmed by ion mass spectrometry

Abstract (French)

On traite de la caracterisation des films de passivation formes sur l'acier inoxydable (26% Cr et 0 a 3% Mo). On essaye de determiner l'influence du potentiel de passivation applique et l'effet d'addition de molybdene a l'acier, sur les profils de composition des films de passivation formes dans une solution NaCl (3,5% a pH 2,5). La technique a mis en jeu une spectroscopie Auger combinee a un bombardement ionique. Quelques techniques electrochimiques ont ete utilisees conjointement. On decrit une approche quantitative des spectres Auger durant le retrait progressif du film de passivation. Les hauteurs pic a pic des raies Auger sont traitees de facon a obtenir la fraction atomique des differents elements presents dans une sous-couche superficielle donnee. L'etude analytique du film par spectroscopie d'electrons montre que le molybdene joue un role a l'interface metal-oxyde ou cet element agit sur le processus de diffusion du chrome. Ce phenomene, qui depend du potentiel impose, peut conduire a la formation de sous-couches ayant une tres faible efficacite en courant dans les mesures en reduction cathodique. L'information obtenue par spectroscopie Auger est confirmee par spectrometrie de masse a emission d'ions

Additional details

Additional titles

Original title (French)
Etude par spectrometrie Auger des films de passivation formes a la surface des aciers inoxydables

Publishing Information

Journal Title
Vide. Couches Minces
Journal Volume
30
Journal Issue
176
Series
Vide. Couches Minces.
Journal Page Range
70-75

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
7239843
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
AUGER ELECTRON SPECTROSCOPY; CHROMIUM-MOLYBDENUM STEELS; DIFFUSION; FILMS; PASSIVATION; SPUTTERING; STAINLESS STEELS; SURFACE PROPERTIES
Descriptors DEC
ALLOYS; CARBON ADDITIONS; CHROMIUM ALLOYS; CHROMIUM STEELS; CORROSION RESISTANT ALLOYS; ELECTRON SPECTROSCOPY; IRON ALLOYS; IRON BASE ALLOYS; MOLYBDENUM ALLOYS; SPECTROSCOPY; STEELS; TRANSITION ELEMENT ALLOYS