| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Surface Engineering and Characterization of Titanium and Titanium Alloys
|
| Presentation Title |
Observations on the Mechanically Assisted Crevice Corrosion of Titanium: Single Asperity Tribocorrosion of Titanium Alloy and Selective Dissolution of Beta Phase of Ti-6Al-4V in Physiologically Representative Conditions |
| Author(s) |
Jeremy L. Gilbert, Annsley Mace, Michael Kurtz, Dongkai Zhu, Yangping Liu |
| On-Site Speaker (Planned) |
Jeremy L. Gilbert |
| Abstract Scope |
Ti-6Al-4V, used in a wide array of medical devices, may be subjected to mechanically assisted crevice corrosion conditions that have been shown to lead to severe in vivo corrosion damage including pitting, selective dissolution of beta phase and oxide-induced stress corrosion cracking. Such mechanisms have yet to be duplicated in vitro. The tribocorrosion processes associated with hard single asperities have also not been well characterized across spatial scales from micron to the atomic scale. This presentation will discuss the tribocorrosion response of titanium using single asperities of varying characteristic sizes and electrochemical atomic force microscopy methods where tribocorrosion from sub-oxide thickness to nanometers can be quantified. Selective dissolution of beta phase is also demonstrated using a combination of hydrogen peroxide and cathodic activation. Together, these in vitro efforts help describe the complex interplay between crevice conditions, tribological processes and Ti alloy degradation seen in vivo. |