Taking into account the high metal purity and homogeneous microstructure
of the initial Cu-foam used, the occurrence and diversity of
these morphological and microstructural aspects in the Cu-foam following
Cr(VI) removal tests are ascribed completely to characteristics of the
corrosion process during filtration. As mentioned in [31], corrosion performance
of an open cell foam is not a simple matter, especially as flow
conditions and electrochemical properties throughout the foam body
are related with the geometrical characteristics of the foam, presumably
being affected by the local corrugated surface morphology of the pores.
In any case, the analysis of Cu-foams electrochemical characteristics
throughout the foam's body is rather sophisticated and complex and is
outside the scope of this study.