RT info:eu-repo/semantics/article
T1 Multiscale electrochemical analysis of the corrosion of titanium and nitinol for implant applications
A1 Souto, Ricardo Manuel
A1 Izquierdo Pérez, Javier
A1 González-Marrero, M.B.
A1 Bozorg, M.
A1 Fernández Pérez, Bibiana María
A1 Vasconcelos, H. Cristina
A1 Santana, Juan José
K1 Ti alloys
K1 corrosion resistance
K1 passive layers
K1 potentiodynamic polarization
K1 scanning electrochemical microscopy
K1 biomaterials
AB Surface electrochemical activity of titanium and nitinol biomaterials in naturally aerated Ringer’s physiological solution was investigated using potentiodynamic polarization and scanning electrochemical microscopy (SECM) techniques. SECM was operated in feedback and redox competition modes as a function of potential applied to the substrate. The kinetics of the electron transfer rate on both materials was characterized by mathematical modelling of the Z-approach curves monitored under feedback conditions. The rate constant values greatly depended on the characteristics of the passive layers formed over the metals under potentiostatic control. A more insulating film was found on nitinol when biased at low polarizations, resulting in smaller tip current increments during tip approach to the investigated surface under positive feedback and competition operation modes. However, at higher anodic polarizations, nitinol passive layers experience breakdown, and therefore tip current values reflect the release of metal cations from the biomaterial surface
YR 2016
FD 2016
LK http://riull.ull.es/xmlui/handle/915/19056
UL http://riull.ull.es/xmlui/handle/915/19056
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 19-nov-2024