W. Haider, N. Munroe, V. Tek, P. Gill, C. Pulletikurthi, S. Pandya, Florida International University, Miami, FL
Nitinol usage for biomedical implant devices has received significant attention due to its high corrosion resistance and biocompatibility. However, surface treatments are known to effect surface charge, surface chemistry, morphology, wettability and corrosion resistance. In this investigation, the corrosion resistance and morphology of NiTi, NiTiCu, NiTiTa, NiTiCr were determined after being subjected to electropolishing, magnetoelectropolishing, and water boiling and passivation. Cyclic polarization in vitro corrosion tests were conducted in Phosphate Buffer Saline (PBS) in compliance with ASTM F 2129-08 before and after surface treatments. The pH and dissolved oxygen were also measured and the concentration of metal ions in PBS after corrosion were measured by ICPMS analysis. The surface morphology was studied with SEM before and after corrosion tests.
Summary: Surface treatments are known to effect surface charge, surface chemistry, morphology, wettability and corrosion resistance. In this investigation, the corrosion resistance and morphology of NiTi, NiTiCu, NiTiTa, NiTiCr were determined after being subjected to electropolishing, magnetoelectropolishing, and water boiling and passivation. Cyclic polarization in vitro corrosion tests were conducted in Phosphate Buffer Saline (PBS) in compliance with ASTM F 2129-08 before and after surface treatments.
