In Situ Impedance Spectroscopy Study Of The Electrochemical Corrosion Of Orthopedic Ti-6Al–7Nb In Simulated Body Fluid

N. A. Al-Mobarak

Department of Chemistry, College of Science, Princess Nora Bint Abdul Rahman University, Pox 22559 Riyadh 11416, Kingdom of Saudi Arabia

Adv. Mater. Lett., 2012, Current Issue, 3 (5), pp 433-440

DOI: 10.5185/amlett.2012.9425

Publication Date (Web): Sep 23, 2012

E-mail: n_almobarak@yahoo.com

Abstract


The corrosion resistance of titanium alloy, Ti–6Al–7Nb, was investigated through electrochemical impedance spectroscopy (EIS), open circuit potential (OCP) measurements and scanning electron microscopy (SEM) and Energy Dispersive X-ray (EDX) analysis. The tests were done in Hank's solution at 37 oC for immersion periods expanded to 169 h. A high corrosion resistance was obtained for Ti–6Al–7Nb alloy in hank's solution due to the stable passive film formed on its surface. The EIS results indicated the presence of a single passive layer immediately after immersion. However, after 24 h of immersion in hank's solution, the EIS exhibited the presence of a bi-layered surface corresponding to an inner layer and an outer layer. Further, the film formed on the alloy after 169 h was confirmed by SEM and EDX analysis as calcium and phosphate may be due to apatite formation.

Keywords

Ti-6Al-7Nb, biomaterials, EIS, HankÃ,¢,â,&sbquo,¬,â,&bdquo,¢,s solution.

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