Figure 5
From: Low voltage environmentally friendly plasma electrolytic oxidation process for titanium alloys
XPS spectra for Ti-B. (a) The C 1s peak for the coatings oxidized with aminophenol in the PEO bath is at ~ 284 eV. The peak at ~ 282 eV indicates the presence of Ti-C in the coating. (b) Core-loss peak for N 1s shows the presence of metal nitrides in the coating, potentially synthesized under the influence of arc energy in generated by nitrogen-containing PEO bath. Additionally, we also observe a low intensity peak for NSi2O at ~ 399 eV. (c) XPS peaks for O1s correspond to the presence of metal oxides and adventitious material on the coating surface. (d) XPS spectra for Si2p indicate that the ceramic layer contains TiSiOX and potentially Si3N4. (e) Ti2p core-loss peaks exhibit a complex shape. The coating is primarily composed of titanium oxides. The minor satellite feature at ~ 459 eV is due to the presence of Ti–N bonds in the coating. The peak at ~ 455 eV corresponds to the presence of Ti–C bonds.
