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Corrosion Study and Passive Film Characterization of 11% Cr F/M and 15% Cr ODS Steels



Author(s)

Masatoshi Sakairi1, Sublime Ningshen1, 2, Keita Suzuki1 and Shigeharu Ukai1

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DOI:10.17265/1934-7359/2013.08.005

1. Faculty of Engineering, Hokkaido University, Hokkaido 060-8628, Japan
2. Corrosion Science and Technology Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India

An ODS (oxide dispersion strengthened) steels are one of the most notable structural materials being developed for future high-temperature energy production technologies, and several studies have been devoted to the development of ODS materials for such applications. However, only little paper focuses on corrosion behavior of F/M (ferritic martensictic) and ODS steels. The corrosion behavior of 11% Cr F/M steel and 15% Cr ODS steel were evaluated using electrochemical methods in borate buffer and 1 kmol m^-3 HNO₃ with or without NaCl and also in boiling 60% nitric acid. The corrosion resistance results clearly indicated the influences of steel alloys composition and chloride ions. The XPS (X-ray photo-electron spectroscopy) results of the pre-passivated surface revealed that the oxide formed were composed predominantly of Fe₂O₃ along with Cr₂O_3, and Y₂O₃ layers in ODS steel. The corrosion rate measured in boiling nitric acid for 48 h for both the steels shows high corrosion rate in boiling condition. The SEM (scanning electron microscopy) observation of the pit morphology after corrosion tests appears with shallow pit in both steel surfaces. The corrosion degradation behavior in relation to the composition of the passive oxide film in different electrolytic solutions is discussed in this paper.

F/M steel, ODS steel, corrosion, passive film, XPS analysis.