Correlation of the nanostructure of the anodic layers fabricated on Ti13Nb13Zr with the electrochemical impedance response

•Fabrication of TiO2 layers on Ti13Nb13Zr by anodization in H2SO4/HF electrolyte.•Nanoporous and nanotubular nanostructures of homogeneous morphology are grown.•Good correlation between impedance measurements and microstructural examination.•2-D distribution for the capacitance–CPE relation provides satisfactory values.•The inter-tubular spaces in the NT layers jeopardizes the protective properties.

TiO2 layers on Ti13Nb13Zr were fabricated by anodizing in acidic fluorine solution, to determine the nanostructure and electrochemical stability in a PBS solution. The anodization process showed higher growth efficiency. The morphology of nanostructured layer is more homogenous and thicker layers are obtained in shorter times regarding to organic electrolytes. Additionally, nanostructured oxide films were electrochemically studied to correlate the protective properties of the anodic films with the morphology and nanostructure developed in each anodizing condition. The anodic layers grown at short times present nanoporous structure and higher corrosion resistance than those fabricated at longer times, which possess nanotubular structure.

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