Quantum chemical molecular dynamics simulation of oxidation process on clean metal surface in high temperature water

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Stress corrosion cracking (SCC) of stainless steels used in light water reactor nuclear power plants is a potentially critical issue concerning safety of plant operation. Chemical reactions of steel surfaces in high temperature water such as oxidation and/or anodic dissolution, and subsequent formation of protective film is a crucial process in crack propagation of SCC, and therefore, it is important to understand the interaction of water with iron based alloys for understanding SCC mechanisms. In this study, in order to obtain better knowledge of the surface chemistry of iron based alloys in the presence of high temperature water, we performed a tight-binding quantum molecular dynamics calculation of the initial oxidation stage of pure Fe and Fe-Cr alloy surfaces. H2O molecules were dissociated on the Fe and Fe-Cr surfaces at 561 K. Chromium atoms at the top layer segregated from the surfaces faster than iron atoms to bond with oxygen atoms. Chromium concentration around the oxygen gradually increased to form Cr-O bonds, which resulted in clustering of oxygen and chromium atoms. The clustering of oxygen and chromium is believed to bring about Cr-based oxide nucleation and therefore, the formation of Cr-O bonds is considered to be the initial process of the formation of oxide films on the Fe-Cr alloy surface.

Original languageEnglish
Title of host publicationComputational Approaches to Materials for Energy
Pages25-30
Number of pages6
Publication statusPublished - 2010 Dec 1
Event2010 MRS Spring Meeting - San Francisco, CA, United States
Duration: 2010 Apr 52010 Apr 9

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1263
ISSN (Print)0272-9172

Other

Other2010 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period10/4/510/4/9

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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