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Stainless Steel Surface Structure and Initial Oxidation at Nanometric and Atomic Scales

  • Ma, Li
  • Wiame, Frederic
  • Maurice, Vincent
  • Marcus, Philippe
Publication Date
Jul 25, 2019
Submission Date
Jul 25, 2019
DOI: 10.1016/j.apsusc.2019.07.166
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The durability of passivable metals and alloys is often limited by the stability of the surface oxide film, the passive film, providing self-protection against corrosion in aggressive environments. Improving this stability requires to develop a deeper understanding of the surface structure and initial surface reactivity at the nanometric or atomic scale. In this work we applied scanning tunneling microscopy to unravel the surface structure of a model stainless steel surface in the metallic state and its local modifications induced by initial reaction in dioxygen gas. The results show a rich and complex structure of the oxide-free surface with reconstructed atomic lattice and self-organized lines of surface vacancies at equilibrium. New insight is brought into the mechanisms of initial oxidation at steps and vacancy injection on terraces leading to Cr-rich oxide nuclei and locally Cr-depleted terraces, impacting the subsequent mechanism of chromium enrichment essential to the stability of the surface oxide.

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