Hydrogen Uptake and Hydrogen Profiles in Chromia Scales Formed on Ni25Cr(Mn) in Low pO₂ Test Gases at 1000°C

Abstract:

Two chromia forming materials have been exposed to different test gases at low pO2. All used test gases contained hydrogen species in the form of molecular hydrogen and water vapour. To insure the validity of the measured H-profiles H2 was replaced by with D2 and H2O by D2O. The Deuterium profiles in the oxides formed were established using SIMS and GDOES techniques. The profiles were quantified and correlated with the growth rate and the microstructures of the chromia scales formed on in low pO2 test gases. The presence of H2/H2O in the low pO2 test gas alters the properties of thermally growing chromia scales.

• Periodical: Advances in Science and Technology (Volume 72)
• Pages: 59-64
• DOI: https://doi.org/10.4028/www.scientific.net/AST.72.59
• Online since: October 2010
• Authors: Michael Hänsel, Laura Garcia-Fresnillo, Stefanus Luman Tobing, Uwe Breuer, Vladimir Shemet
• Keywords: Diffusion, H-Defect, High Temperature Oxidation of NiCr, Low Oxygen Partial Pressure, Transport In Chromia Scale, Water Vapor

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