Journal
CORROSION SCIENCE
Volume 51, Issue 3, Pages 446-450Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2009.01.008
Keywords
Oxidation; Hydrogen embrittlement; Hydrogen absorption; High-temperature corrosion; Rare earth elements
Funding
- Deutsche Forschungsgemeinschaft (DFG)
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The oxidation behavior of vacuum plasma sprayed, free-standing MCrAlY-coatings was studied in Ar-20%O-2 and Ar-4%H-2-2%H2O. During exposure in Ar-4%H-2-2%H2O the coating formed large blisters. This phenomenon was attributed to H-2-gas evolution within the coating, creating high pressures sufficient for coating plastic deformation as a result of atomic hydrogen recombination on coating defects. It is suggested that the hydrogen is produced at the scale/metal interface by reaction of H2O-vapor with yttrium and aluminium present in the coating. (C) 2009 Elsevier Ltd. All rights reserved.
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