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Lateral variation of the native passive film on super duplex stainless steel resolved by synchrotron hard X-ray photoelectron emission microscopy

  • M. Långberg
  • , F. Zhang
  • , E. Grånäs
  • , C. Örnek
  • , J. Cheng
  • , M. Liu
  • , C. Wiemann
  • , A. Gloskovskii
  • , T. F. Keller
  • , C. Schlueter
  • , S. Kulkarni
  • , H. Noei
  • , D. Lindell
  • , U. Kivisäkk
  • , E. Lundgren
  • , A. Stierle
  • , J. Pan*
  • *Corresponding author for this work
  • KTH Royal Institute of Technology
  • Swerim AB
  • German Electron Synchrotron
  • Jülich Research Centre
  • University of Hamburg
  • Sandvik AB
  • Lund University

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

A native passive film on 25Cr-7Ni super duplex stainless steel was analyzed using synchrotron hard X-ray photoemission electron microscopy, focusing on variations between individual grains of ferrite and austenite phases. The film consists of an oxide inner layer and an oxyhydroxide outer layer, in total 2.3 nm thick. The Cr content is higher in the outer than the inner layer, ca. 80 % on average. The Cr content is higher on ferrite than austenite, whereas the thickness is rather uniform. The grain orientation has a small but detectable influence, ferrite (111) grains have a lower Cr content than other ferrite grains.

Original languageEnglish
Article number108841
JournalCorrosion Science
Volume174
DOIs
Publication statusPublished - Sept 2020

Bibliographical note

Publisher Copyright:
© 2020 The Authors

Keywords

  • duplex stainless steel
  • lateral variation
  • passive film
  • photoelectron emission spectroscopy
  • synchrotron technique

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