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. 2021 Apr 6;22(7):3800. doi: 10.3390/ijms22073800

Figure 3.

Figure 3

(A) A schematic drawing of the plasma electrolytic oxidation (PEO) setup with a cathode and an anode (implant). (B) During PEO processing, initially the titanium oxide layer grew outwards. After dielectric breakdown, plasma discharge occurred at the surface, resulting in a highly porous structure.