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Effects of surface states on the oxidation behavior of 316LN stainless steel in high temperature pressurized water.
- Source :
-
Materials & Corrosion / Werkstoffe und Korrosion . Jul2015, Vol. 66 Issue 7, p670-680. 11p. - Publication Year :
- 2015
-
Abstract
- Nuclear grade 316LN stainless steel with different surface states are prepared: electropolished and ground to 240 grit. Surface topography, surface Volta potential distribution, and nanohardness distribution on cross-sectional surface are investigated, respectively. Oxide films on the ground and electropolished samples after immersion in high temperature pressurized (HTP) water for 0.1, 168, and 366 h were studied using various methods. Distinct from electropolished surface, the ground surface is featured by a rugged surface and a heterogeneous distribution of surface Volta potential. A thicker (∼28 μm) cold-worked layer was introduced by grinding.More crystallites were precipitated on the ground surface, resulting from the existence of high-energy sites with higher residual strain and higher electrochemical activity and a less protective inner layer. The oxidation rate was reduced by electropolishing and a thinner oxide film was formed, due to the formation of a more protective oxide film with higher content of chromium (Cr). The mechanism of oxide film formation was further discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09475117
- Volume :
- 66
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Materials & Corrosion / Werkstoffe und Korrosion
- Publication Type :
- Academic Journal
- Accession number :
- 108757475
- Full Text :
- https://doi.org/10.1002/maco.201407912