Sealing of porous titanium oxides produced by plasma electrolytic oxidation

Plasma electrolytic oxidation is a powerful technique allowing the formation of ceramic coatings with high degree functionalization. Plasma–chemical interactions, resulting from application voltage in conductive electrolyte, like 0.5 M NaOH, favor development porous surface, which deserves to be sealed obtain proper corrosion resistance. In present work, effect temperature employed during sealing calcium acetate investigated, finding 85°C as an optimum allow pores closure. Furthermore, comparison performed hot water presented, demonstrated similar efficiency. Scanning electron microscope and electrochemical impedance spectroscopy are tools selected investigate effects. Impedance spectra fitted according feasible equivalent circuits two-time constants when applied samples indicative presence barrier layer, respectively.