Premium
Corrosion of atomized Fe40Al based intermetallics in molten Na 2 SO 4
Author(s) -
Espinosa M. A.,
Carbajal De la Torre G.,
PorcayoCalderon J.,
MartinezVillafañe A.,
ChaconNava J. G.,
Casales M.,
GonzalezRodriguez J. G.
Publication year - 2003
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200390069
Subject(s) - corrosion , intermetallic , feal , materials science , metallurgy , polarization (electrochemistry) , chemistry , alloy
The hot corrosion resistance of sprayed and atomized Fe‐40at.%Al, Fe40Al+0.1B and Fe40Al+0.1B+10Al 2 O 3 intermetallic materials have been evaluated in molten Na 2 SO 4 at 900 and 1000°C using polarization curves and polarization resistance measurements. The results are supported by electron microscopy and microchemical studies. The tests lasted 5 days. At 900°C the Fe40Al material had the lowest corrosion rate (0.03 mA/cm 2 ), and the Fe40Al+0.1B+10Al 2 O 3 exhibited the highest. At 1000°C, the Fe40Al+0.1B material, was the material that had the best corrosion resistance with less than 0.02 mA/cm 2 in the first 50 hours, whereas the Fe40Al presented the worst corrosion resistance with 0.20 mA/cm 2 . The results are discussed in terms of the establishment of an Al 2 O 3 layer that gives corrosion resistance to the materials and promotes an Al depletion in the FeAl matrix which allows the sulfides formation.