Corrosion Products Phase Identification of corrosion products of iron Using micro-Raman and FTIR

MAJTÁS Dušan^1,2, MÁCOVÁ Petra^1 ^

^1Institute of Theoretical and Applied Mechanics, Prague, Czech Republic, EU, majtas@itam.cas.cz,

 ^2Faculty of Sciences, Department of Chemistry, Masaryk University, Brno, Czech Republic, EU


Abstract:

Phase identification of corroded objects might be problematic; present corrosion products are
complex mixture of different phases each of different amount. Furthermore some of present phases
may be either semi-crystalline or amorphous. The most suitable procedure is to use the XRD for
analysing crystalline structure of phases in bulk; then use Raman spectroscopy to obtain
information on smaller scale and given location. Raman spectroscopy identifies crystalline and
semi-crystalline phases. The last step is to apply the Mossbauer spectroscopy to find amorphous
phases. If Mossbauer spectroscopy is not available and it is reasonable to assume the contained
phases are not strictly amorphous; the XRD and Raman should be sufficient. Should using FTIR in
addition to Raman give a suitable advantage? The methods may be interchangeable to some point. But
is it safe to assume all phases present can be detected?