Microscopic work function anisotropy and surface chemistry of 316L stainless steel using photoelectron emission microscopy

N. Barrett 1, * O. Renault 2 H. Lemaître 3, 4 P. Bonnaillie 5 F. Barcelo 6 F. Miserque 7 M. Wang 8 C. Corbel 8
* Corresponding author
1 LENSIS - Laboratoire d'Etude des NanoStructures et Imagerie de Surface
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
6 LA2M - Laboratoire d'Analyse Microstructurale des Matériaux
SRMA - Service des Recherches Métallurgiques Appliquées : DEN/DMN/SRMA
7 LECA - Laboratoire d'Etude de la Corrosion Aqueuse
SCCME - Service de la Corrosion et du Comportement des Matériaux dans leur Environnement : DEN/DPC/SCCME/LECA
Abstract : We have studied the variation in the work function of the surface of sputtered cleaned 316L stainless steel with only a very thin residual oxide surface layer as a function of grain orientation using X-ray photo-electron emission microscopy (XPEEM) and Electron Backscattering Diffraction. The grains are mainly oriented [1 1 1] and [1 0 1]. Four distinct work function values spanning a 150 meV energy window are measured. Grains oriented [1 1 1] have a higher work function than those oriented [1 0 1]. From core level XPEEM we deduce that all grain surfaces are Cr enriched and Ni depleted whereas the Cr/Fe ratio is similar for all grains. The [1 1 1] oriented grains show evidence for a Cr 2 O 3 surface oxide and a higher concentration of defective oxygen sites.
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N. Barrett, O. Renault, H. Lemaître, P. Bonnaillie, F. Barcelo, et al.. Microscopic work function anisotropy and surface chemistry of 316L stainless steel using photoelectron emission microscopy. Journal of Electron Spectroscopy and Related Phenomena, Elsevier, 2014, 195, pp.117 - 124. ⟨10.1016/j.elspec.2014.05.015⟩. ⟨cea-01376760⟩

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