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@PHDTHESIS{Schmitt:229364,
author = {Schmitt, Markus},
othercontributors = {Spiegel, Michael},
title = {{I}nvestigations on high-temperature corrosion of
commercial materials and model alloys in simulated waste and
biomass combustion environments},
address = {Aachen},
publisher = {Publikationsserver der RWTH Aachen University},
reportid = {RWTH-CONV-144334},
pages = {II, 166 S. : Ill., graph. Darst.},
year = {2013},
note = {Zsfassung in dt. und engl. Sprache; Aachen, Techn.
Hochsch., Diss., 2013},
abstract = {The motivation of this work was to find cost-effective and
corrosion resistant alloys as alternatives to commercial
materials, which meet the requirements in waste incineration
and biomass combustion power plants. As commercial materials
low- and high-alloyed steels and a Nickel-based alloy were
investigated. The model alloys were $9\%Cr-alloys$ modified
with nickel, aluminium and silicon, and binary
iron-aluminides with max. 40 $at.\%$ Al. In the exposure
experiments, the materials were covered with synthetic
deposits of chlorides and sulfates and corroded in
$N2-8\%O2-15\%H2O-0.2\%HCl-0.02\%SO2-$ and
$N2-5\%O2-22\%H2O-13\%CO2-0.02\%HCl-atmospheres,$
respectively, in a temperature range of 320°C to 600°C.
The corrosion behaviour of the materials was determined
concerning their mass loss, kinetics, and scale analysis.
The degradation was discussed regarding the influence of the
alloy composition, and the thermodynamic driving force in
terms of activities and gradients in the governing corrosion
mechanisms. The two main high-temperature corrosion
mechanisms were the chlorinecatalysed ’Active Oxidation’
and in the presence of molten salt the ’Hot Corrosion’,
i.e. acidic and basic fluxing. Under these conditions, the
commercial materials with a high chromium or Cr/Ni-content
showed most of the time a very low material loss. In
comparison with commercial $9\%Cr-steels,$ modified
$9\%Cr-alloys$ with additions of 5 $wt.-\%$ Ni, 2.5 $wt.\%$
Al and 2.5 $wt.\%$ Si, respectively, showed a predominantly
improved corrosion resistance. Also, Fe-Al materials with an
aluminium content of at least 26 $at.-\%$ showed a
considerably increased corrosion resistance. With regard to
high-temperature corrosion in waste incineration and biomass
combustion atmospheres, respectively, and salt deposits it
was demonstrated that under most experimental conditions the
model alloys have shown an economical alternative to
high-alloyed austenitic steels and nickel-based alloys with
respect to their corrosion resistance.},
keywords = {Hochtemperaturkorrosion (SWD) / Heißgaskorrosion (SWD) /
Chloride (SWD) / Salzablagerung (SWD) / Müllverbrennung
(SWD) / Ferritisch-martensitischer Stahl (SWD) /
Eisenaluminide (SWD)},
cin = {520000 / 524110},
ddc = {620},
cid = {$I:(DE-82)520000_20140620$ / $I:(DE-82)524110_20140620$},
typ = {PUB:(DE-HGF)11},
urn = {urn:nbn:de:hbz:82-opus-47259},
url = {https://publications.rwth-aachen.de/record/229364},
}
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