Electrochemical and XPS studies of titanium for biomaterial applications with respect to the effect of hydrogen peroxide.
Electrochemical measurements, x-ray photoelectron spectroscopy, and scanning tunneling microscopy have been used to study the effect of hydrogen peroxide on the passivity of titanium in a phosphate-buffered saline (PBS) solution. The results indicate that the passive film formed in the PBS solution--with and without addition of H2O2--may be described with a two-layer structure model. The inner layer has a structure close to TiO2 whereas the outer layer consists of hydroxylated compounds. The introduction of H2O2 in the PBS solution broadens the hydroxylate-rich region, probably due to the formation of a Ti(IV)-H2O2 complex. Furthermore, the presence of H2O2 results in enhanced dissolution of titanium and a rougher surface on a microscopic scale. Finally, a dark pigmentation (blue color) is observed when titanium has been exposed--for several weeks--to PBS with additions of H2O2.
Pan
J
J
Department of Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden.
Thierry
D
D
Leygraf
C
C
D003116:Color; D003343:Corrosion; D004563:Electrochemistry; D004577:Electron Probe Microanalysis; D006861:Hydrogen Peroxide / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D010777:Photochemistry; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D006861:Hydrogen Peroxide; D014025:Titanium