Abstract
Metastable Al2O3 scale formation on NiCoCrAl coated layers was investigated during initial-stage reaction for up to 100 h exposure at 800 °C in air. NiCoCrAl was diffusion-coated onto low carbon steel by electroplating a NiCo layer followed by pack-cementation deposition of Cr and Al. The microstructural characterization of as-coated and oxidized samples was carried out at the micro- and nano-scales. The XRD and diffraction pattern in TEM analysis revealed the presence of metastable Al2O3, spinel NiAl2O4 and cubic (Cr,Al)2O3 in the oxide. The phase identification using XRD and electron diffraction analysis associated with the coating composition was plotted on an isothermal oxidation map.
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Acknowledgments
A part of this work was conducted at Hokkaido University, supported by “Nanotechnology Platform” Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This work was financially supported by JSPS Ronpaku Program, Japan and LIPI Competitive Program, Indonesia.
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Sugiarti, E., Zaini, K.A., Wang, Y. et al. Transmission Electron Microscopy of Meta-stable Al2O3 Scale Formed on NiCoCrAl Coated Layer During Isothermal Oxidation. Oxid Met 83, 453–464 (2015). https://doi.org/10.1007/s11085-014-9514-3
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DOI: https://doi.org/10.1007/s11085-014-9514-3