Corrosion Behavior of Ti-6Al-7Nb Alloy in Biological Solution for Dentistry Applications

摘要

The corrosion behavior of titanium alloy without vanadium Ti-6Al-7Nb under simulatedbiological conditions was investigated and compared with that of titanium and Ti-6Al-4V alloy, whichemployed as biomaterials. The aim of the present study was to evaluate their corrosion performancethrough the analysis of open circuit potential (OCP) and corrosion resistance using electrochemicalimpedance spectroscopy (EIS) tests. A high corrosion resistance was obtained for Ti-6Al-7Nbcompared to that of titanium and TiAlV alloy, indicating a typical passive behavior for Ti-6Al- 7Nb alloy, which can be attributed to a highly stable film formed on Ti-6Al-7Nb alloy in Hanksolution. The corrosion resistance of the three electrodes was in the order of Ti > Ti-6Al-7Nb > Ti- 6Al-4V . Thus, Ti-6Al-7Nb can be used instead of Ti-6Al-4V to avoid the problems related withvanadium.