Electrochemical behavior of Ti-20Cr-X alloys in artificial saliva containing fluoride
In this study, electrochemical investigation was carried out on commercially pure titanium (c.p. Ti) and as-cast Ti-20Cr-X (X = Nb, Mo, Fe, and Cr) in fluoride solutions containing artificial saliva. Open-circuit potential (OCP) and potentiodynamic polarization measurement were used to characterize the electrochemical behavior, and X-ray photoelectron spectroscopy (XPS) was used to characterize the composition of the passive films on the samples. The OCP results indicated that all specimens presented spontaneous passivation. XPS results showed that pre-test, a passive film consisting of TiO2 and Cr2O3 formed on the surface of the Ti-20Cr-X alloys, and Na2TiF6 formed on the surface of all specimens after the polarization test in artificial saliva with 0.5 wt% NaF. Although the Ti-20Cr-X alloys exhibited a Na2TiF6 film on their surface, their corrosion rate was still lower than that of c.p. Ti. In particular, Ti-20Cr-Mo alloy exhibited the lowest steady state current density compared to c.p. Ti and the other Ti-20Cr-X alloys. All these results suggest that the Ti-20Cr-X alloys hold promise for application as dental materials in a natural oral environment where NaF may be present.
KeywordsTitanium alloys Electrochemical behavior Artificial saliva Fluoride
The authors wish to gratefully acknowledge the Ministry of Education, Republic of China for supporting this research, project No. E-12-138. The authors also express appreciation to Mr. Tim Casteling from the Centre of English Studies for his editorial assistance.
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