Journal
CORROSION SCIENCE
Volume 78, Issue -, Pages 322-334Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2013.10.015
Keywords
Steel; Polarization; XPS; TEM; Passive films; High temperature corrosion
Funding
- Japan Society for the Promotion of Science, Tokyo, Japan
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The passive film compositions and corrosion resistance of 12% Cr and 15% Cr oxide dispersion strengthened (ODS) steels in 3 M HNO3 to 9 M HNO3 was evaluated. The potentiodynamic polarization plots exhibited a shift in corrosion potential, and higher passive current density with increasing HNO3 concentrations. In 12% Cr ODS. steel, high corrosion rate was observed in all HNO3 concentrations. However, low corrosion rate observed in 15% Cr ODS steel was attributed to Al2O3 enrichment. The TEM analysis indicated a complex Y2Hf2O7 formation in 15% Cr ODS steel, and this may have a role in suppressing intergranular corrosion attack. 2013 Elsevier Ltd. All rights reserved.
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