NaCl and CaCl2-induced high temperature corrosion of automotive exhaust components
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2018. 1-15 Beitrag in Corrosion 2018, Phoenix, Arizona, USA / Vereinigte Staaten.
Publikationen: Konferenzbeitrag › Paper › (peer-reviewed)
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TY - CONF
T1 - NaCl and CaCl2-induced high temperature corrosion of automotive exhaust components
AU - Vidic, Karl
AU - Mori, Gregor Karl
PY - 2018/4/15
Y1 - 2018/4/15
N2 - The high temperature corrosion behavior of ferritic stainless steel UNS S43940 has been investigated by means of cyclic exposure tests (CETs) at 650°C, in presence of NaCl and CaCl2 containing salt deposits and in test gases with different O2 and H2O concentrations. CETs of steel sheets, coated with a salt layer and steel sheets, covered by a salt-contaminated glass fiber-insulation mat, have been performed. Tested salts were NaCl and CaCl2xH2O in different weight ratios. Steel specimen have been investigated gravimetrically, optically and by means of scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX). The oxides have been analyzed via X-ray diffraction (XRD), ion chromatography (IC), flame atomic absorption spectroscopy (FAAS) and UV/VIS spectroscopy.Results show that in presence of NaCl, CaCl2 and oxygen, voluminous Fe2O3- and CaCrO4-containing oxide scales are formed. Highest mass loss was measured on salt-coated steel specimen, exposed to air + 0.05 % H2O. Steel sheets with the salt-contaminated mat showed significantly lower mass loss than those with the salt layer.
AB - The high temperature corrosion behavior of ferritic stainless steel UNS S43940 has been investigated by means of cyclic exposure tests (CETs) at 650°C, in presence of NaCl and CaCl2 containing salt deposits and in test gases with different O2 and H2O concentrations. CETs of steel sheets, coated with a salt layer and steel sheets, covered by a salt-contaminated glass fiber-insulation mat, have been performed. Tested salts were NaCl and CaCl2xH2O in different weight ratios. Steel specimen have been investigated gravimetrically, optically and by means of scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX). The oxides have been analyzed via X-ray diffraction (XRD), ion chromatography (IC), flame atomic absorption spectroscopy (FAAS) and UV/VIS spectroscopy.Results show that in presence of NaCl, CaCl2 and oxygen, voluminous Fe2O3- and CaCrO4-containing oxide scales are formed. Highest mass loss was measured on salt-coated steel specimen, exposed to air + 0.05 % H2O. Steel sheets with the salt-contaminated mat showed significantly lower mass loss than those with the salt layer.
KW - Automotive Exhaust System,
KW - Automotive Exhaust System, NaCl- and CaCl2-Induced High Temperature Corrosion
KW - Hot Alkali Metal- and Alkaline Earth Metal Chlorides
KW - UNS S43940
M3 - Paper
SP - 1
EP - 15
T2 - Corrosion 2018
Y2 - 15 April 2018 through 19 April 2018
ER -