| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1469048 | Corrosion Science | 2014 | 13 Pages |
•Corrosion resistance of oxide dispersion strengthened (ODS) steels is evaluated.•12% Cr ODS steel exhibited high corrosion rate in boiling 3 M to 9 M HNO3.•Increasing concentration of nitric acid increases corrosion rate in both ODS steels.•Lower corrosion rate of 15% Cr ODS steel in HNO3 was attributed to the role of Al.•The formation of Y–Ti–O and Y–Hf–O oxides may suppress intergranular corrosion.
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.
