Abstract
• All three alloys showed hysteresis loops, suggesting localized corrosion. • The ODS9Cr steels exhibited an improved corrosion resistance compared to NODS. • Higher E BP and R ct ; lower I pass were observed for ODS9Cr-ZrO 2 alloy. • The finer structure and passive layer make ODS9Cr steels more corrosion resistant. • However, ODS9Cr steel has slightly better corrosion resistance. The effect of Zr and ZrO 2 on corrosion behaviour and passive film characteristics of the oxide dispersion strengthened (ODS) steels with 9%Cr (ODS9Cr-Zr and ODS9Cr-ZrO 2 ) and those without the addition of oxide dispersions (NODS) has been studied in 0.6 M NaCl solution using cyclic polarization and electrochemical impedance spectroscopy measurements. Electrochemical corrosion studies indicated that Zr and ZrO 2 addition increases the corrosion resistance of ODS9Cr steels, with the best results obtained for ODS9Cr-ZrO 2 steel. The better corrosion behaviour of ODS9Cr steels is due to its surface morphology and Cr 2 O 3 enriched passive film. Dispersion of Zr and ZrO 2 along with Y 2 O 3 in 9Cr steel considerably improved the corrosion resistance further.
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