During the electrochemical roughening, mainly iron and
nickel components of the alloy are dissolved, thus leading to
enrichment of the chromium-containing phases in the form
of 1–10mm facets of a Venetian mosaic as shown in Fig. 1a
and b. The facets are separated by macroconcavities having
a depth of the same order. This depth is a function of the
time of anodic roughening.