Hot corrosion of YSZ/Al2O3 dispersed NiCrAlY plasma-sprayed coatings in Na2SO4-10 wt.% NaCl melt

This study examines the effect of ytrria stabilized zirconia (YSZ) dispersion on hot corrosion behaviour of NiCrAlY bond coat. Hot corrosion studies were conducted on NiCrAlY and NiCrAlY containing 25, 50 and 75 wt.% YSZ coatings obtained through the air plasma spray technique, in Na2SO4 +10 wt.% Na...

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Bibliographic Details
Published in:Corrosion science 2010-08, Vol.52 (8), p.2592-2602
Main Authors: SREEDHAR, Gosipathala, RAJA, V. S
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied sciences
Coatings
Corrosion
Corrosion environments
Dispersions
Exact sciences and technology
Hot corrosion
Melts
Metallic coatings
Metals. Metallurgy
Oxides
Production techniques
Sprayers
Sprays
Surface treatment
Yttria stabilized zirconia
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Summary:This study examines the effect of ytrria stabilized zirconia (YSZ) dispersion on hot corrosion behaviour of NiCrAlY bond coat. Hot corrosion studies were conducted on NiCrAlY and NiCrAlY containing 25, 50 and 75 wt.% YSZ coatings obtained through the air plasma spray technique, in Na2SO4 +10 wt.% NaCl environment at 800AC. The results show that YSZ dispersion lowers the overall hot corrosion tendency of the NiCrAlY, though it enhances the inherent hot corrosion tendency of its metallic constituent (NiCrAlY). Furthermore, there exists a threshold oxide level beyond which it adversely affects the hot corrosion of the coating.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2010.04.007