Are Fe2O3 and Fe3O4 distinguishable when using SEM and EDX to study the cross section of a corrosion layer on a steel immersed in bicarbonate solution

10 October 2013 1 5K Report

Is it possible to distinguish between Fe2O3 and Fe3O4 and/or FeCO3 when analyzing the cross section of a corrosion layer formed on a steel corroded in bicarbonate or CO2 solutions?

Sergey V Komogortsev

Fe2O3 (both magnetite and hematite) is an insulator. Fe3O4 is the polaronic conductor. Thus Fe3O4 should be much brighter in the SEM image than Fe2O3.

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