Presentation Title

Electrochemical Evaluation of Titanium Alloys for Biomedical Hip Implants

Faculty Mentor

Dr. Vilupanur Ravi, Chemical and Materials Engineering, Cal Poly Pomona

Start Date

17-11-2018 8:45 AM

End Date

17-11-2018 9:00 AM

Location

C164

Session

Oral 1

Type of Presentation

Oral Talk

Subject Area

engineering_computer_science

Abstract

The need for longevity of hip implants is increasing as the life expectancy of the world’s population increases. Titanium and titanium alloys, in particular Ti-6Al-4V (wt%) (Ti64), are commonly used in these applications due to their favorable strength-to-weight ratio, biocompatibility, and corrosion resistance. There are several issues with the long-term use of this alloy. One of these is the phenomenon of stress shielding in which the elastic modulus mismatch between the implant and bone leads to bone loss and subsequent loosening of the implant. Another is the release of metal cations into the body with potentially deleterious effects such as neurological disorders. In addition, inflammatory responses can be triggered through the phenomenon of aseptic loosening in which an imbalance between the osteoclasts and osteoblasts leads to bone resorption. A new class of beta-phase titanium alloys (TNZ alloys), offers promising characteristics for orthopedic applications due to their lower elastic moduli (thereby minimizing stress shielding) and non-toxic characteristics. In this study, the corrosion behavior of the two TNZ alloys, i.e., Ti-39Nb-6Zr (wt%) and Ti-28Nb-20Zr (wt%) and Ti64 control coupons, was investigated through electrochemical testing. The testing was carried in accordance with the ASTM-G59 and ASTM-F2129 standards in phosphate buffered saline solution at normal body conditions (pH 7.4 ±0.2 at 37 ±1 °C) to investigate the corrosion behavior of two TNZ alloys, i.e., Ti-39Nb-6Zr (wt%) and Ti-28Nb-20Zr (wt%), which were compared to TNZ and Ti64 as baselines.

Summary of research results to be presented

The TNZ alloys displayed a higher corrosion potential (> -0.5 V vs. SCE) and lower corrosion current density (< 75 nA/cm2) as compared to the Ti64 control alloy. These results indicate that the TNZ alloys will be more stable in physiological environments and have the potential to last longer in the body. Therefore, the TNZ alloys are promising candidate alloys for biomedical devices in accordance with ASTM F2129-17.

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Nov 17th, 8:45 AM Nov 17th, 9:00 AM

Electrochemical Evaluation of Titanium Alloys for Biomedical Hip Implants

C164

The need for longevity of hip implants is increasing as the life expectancy of the world’s population increases. Titanium and titanium alloys, in particular Ti-6Al-4V (wt%) (Ti64), are commonly used in these applications due to their favorable strength-to-weight ratio, biocompatibility, and corrosion resistance. There are several issues with the long-term use of this alloy. One of these is the phenomenon of stress shielding in which the elastic modulus mismatch between the implant and bone leads to bone loss and subsequent loosening of the implant. Another is the release of metal cations into the body with potentially deleterious effects such as neurological disorders. In addition, inflammatory responses can be triggered through the phenomenon of aseptic loosening in which an imbalance between the osteoclasts and osteoblasts leads to bone resorption. A new class of beta-phase titanium alloys (TNZ alloys), offers promising characteristics for orthopedic applications due to their lower elastic moduli (thereby minimizing stress shielding) and non-toxic characteristics. In this study, the corrosion behavior of the two TNZ alloys, i.e., Ti-39Nb-6Zr (wt%) and Ti-28Nb-20Zr (wt%) and Ti64 control coupons, was investigated through electrochemical testing. The testing was carried in accordance with the ASTM-G59 and ASTM-F2129 standards in phosphate buffered saline solution at normal body conditions (pH 7.4 ±0.2 at 37 ±1 °C) to investigate the corrosion behavior of two TNZ alloys, i.e., Ti-39Nb-6Zr (wt%) and Ti-28Nb-20Zr (wt%), which were compared to TNZ and Ti64 as baselines.