High Temperature Oxidation Behaviour of Ni-Cr-, Ti- and Fe-Based Alloys in Flowing Wet Gas Environment

Abstract:

In this study, three different alloys Stainless Steel 316 (SS316), Titanium 6Al-4V (Ti6A-l4V) and Hastelloy 276 (H276) were exposed to the wet environment with 12% of water vapor and Ar-20%O₂ for 10 h at 900 °C. The oxidation behavior of the samples was analyzed using weight change measurement technique and optical microscope (OM). The phases of the oxide layer on corroded sample were determined using X-ray diffraction (XRD). The difference in the weight gain indicating the difference in the rate of the oxide growth for the samples. Sample Ti6A-l4V showed the most aggressive oxidation behavior compared to the other samples. OM analysis showed a multilayer oxide scale formed on the Ti6A-l4V and H276 samples but only single layer of oxide forms on SS316. Oxide scale for the samples were analyzed using XRD, the result showed the formation of chromia (Cr₂O₃) on SS316. Titanium oxide (TiO₂ ) and alumina oxide (Al₂O₃) were detected on Ti6Al4V, while H276 showed the formation of nickel manganese oxide (Ni_7.2Mn_0.2O₈) and nichromite (NiCr₂O₄).

• Periodical: Materials Science Forum (Volume 888)
• Pages: 418-422
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.888.418
• Online since: March 2017
• Authors: Azila Baharum, Norinsan Kamil Othman*, Zaifol Samsu
• Keywords: Hastelloy, High Temperature Corrosion, Stainless Steel, Titanium Alloy, Water Vapor

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