Corrosion mechanism of titanium dioxide nanotubes in Ringer's solution

Abstract

Titanium dioxide nanotubes (TNTs) layer fabricated via anodizing process in fluoride-containing polar organic electrolyte. The corrosion mechanism of pure Ti and the TNTs immersed in Ringer's solution was investigated and compared using the electrochemical impedance spectroscopy (EIS) method. Scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) analysis were also used to investigate the TNTs. Results showed better corrosion resistance of TNTs compare to the bare Ti. An electrical equivalent circuit (EEC) model including three time-constant was proposed to fit the experimental data obtained for the TNTs. This behavior is attributed to the tube’s wall composition which is consisted of two different regions including an outer region (OR) of the tube and a C- and F-rich inner region (IR). EDX analysis and AT-FTIR spectrum confirmed the presence of C and F