Influence of various gaseous environments on SiO2 formation on the 330Cb (Fe-35Ni-18Cr-1Nb-2.15Si) alloy at 900°C

• Published in: Corrosion science Vol. 65; pp. 535 - 541
• Main Authors: Buscail, Henri, Issartel, C., Riffard, F., Rolland, R., Perrier, S., Fleurentin, A.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.12.2012; Elsevier
• Subjects: A. Stainless steel; Applied sciences; B. SEM; B. X-ray diffraction; C. High temperature corrosion; C. Oxidation; Corrosion; Corrosion environments; Exact sciences and technology; Metals. Metallurgy; B. X-ray diffraction; B. SEM; C. High temperature corrosion; C. Oxidation; A. Stainless steel; Scanning electron microscopy; Temperature; High temperature; X ray diffraction; Silica; Stainless steel; Oxidation; High temperature corrosion
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2012.08.066

► In air the Mn1.5Cr1.5O4 and Cr2O3 scale does not show a good adherence. ► In air no silica scale formation is observed at the internal interface. ► The low oxygen containing gases (N2 or Ar-5% H2) improve the oxide scale adherence. ► Low oxygen gaseous environments promote a cristobalite external scale formation. The influence of various gaseous environments on the 330Cb (Fe-35Ni-18Cr-1Nb-2.15Si) oxidation during 144h, at 900°C, has been studied. In air, a non-adherent Mn1.5Cr1.5O4 and Cr2O3 containing scale is formed and no continuous silica scale is observed at the alloy/oxide interface. In nitrogen, the chromia scale is adherent and a continuous cristobalite subscale is detected at the alloy/oxide interface. In Ar-5vol.% H2, the oxide scale is mainly composed of chromia and manganese chromite. A thick cristobalite scale is also present at the alloy/oxide interface. On this austenitic alloy the protective silica scale formation is promoted by low oxygen containing gaseous environments and the high silicon content.