Corrosion resistance investigation of titanium alloy as tissue engineered bone implant

Abstract

This work used electrochemical impedance measurements and anodic polarisation to study the corrosion susceptibility of Ti, Ti-6Al-4V and TZNT in a buffered saline solution (PBS). The impedance characterization model was obtained under open-circuit conditions and was a double-oxide film model consisting of an inner-barrier oxide layer and a porous, outer layer. Low-pitting potentials were obtained for TZNT. The property of the outer layer depended on the presence of phosphate anions in the saline-buffered solution (SBS) and the electrode material. The typical, low resistances of the porous layers generated on TZNT with phosphate anions ranged from 10 to 70 Ω cm2. Ti, TZNT and Ti-6Al-4V all displayed much higher porous layer resistances without phosphate anions.