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@ARTICLE{Hollnder:902188,
author = {Holländer, Christian and Kiliani, Stefan and Stamm, Werner
and Lüsebrink, Oliver and Harders, Harald and Wessel,
Egbert and Müller, Michael and Singheiser, Lorenz},
title = {{H}ot corrosion of {TBC}‐coated components upon
combustion of low‐sulfur fuels},
journal = {Materials and corrosion},
volume = {72},
number = {10},
issn = {1521-4176},
address = {Weinheim [u.a.]},
publisher = {Wiley-VCH},
reportid = {FZJ-2021-04085},
pages = {1643 - 1655},
year = {2021},
abstract = {Gas turbine reliability is a crucial requirement for
passenger safety in aviation and a secure energy supply.
Hence, corrosive degradation of combustor parts, vanes, and
blades in gas turbines must be prevented. One of the most
severe forms of corrosion is alkali-sulfate-induced hot
corrosion, which is associated with internal sulfidation of
components and is usually anticipated to fade in importance
in the absence of sulfur. However, the literature suggests
that hot corrosion might still occur in low-sulfur
combustion gases. In this study, established thermodynamic
modeling methods are used to analyze the low-sulfur hot
corrosion regime. Liquid sodium chromate is found to be
stable in these conditions. A comparison of calculation
results and engine findings suggests that high alkali levels
can negatively impact thermal barrier coating life even if
sulfur is absent in the fuel. Laboratory tests are carried
out to validate the chromate formation on MCrAlY-coated
specimens. It is shown that molten sodium chromate can alter
the oxidation behavior of MCrAlY, promoting the formation of
voluminous spinel. This represents a new and different form
of hot corrosion compared to type I hot corrosion.},
cin = {IEK-2},
ddc = {670},
cid = {I:(DE-Juel1)IEK-2-20101013},
pnm = {1221 - Fundamentals and Materials (POF4-122)},
pid = {G:(DE-HGF)POF4-1221},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000667449700001},
doi = {10.1002/maco.202112371},
url = {https://juser.fz-juelich.de/record/902188},
}