期刊
ELECTROCHIMICA ACTA
卷 203, 期 -, 页码 366-378出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.01.146
关键词
Ti alloys; corrosion resistance; passive layers; potentiodynamic polarization; scanning electrochemical microscopy; biomaterials
资金
- Spanish Ministry of Economy and Competitiveness (MINECO, Madrid, Spain) [CTQ2012-36787]
- European Regional Development Fund (Brussels, Belgium) [CTQ2012-36787]
- Spanish Ministry of Education (Programa de Formacion de Personal Investigador, Madrid, Spain)
- Obra Social La Caixa - Fundacion Cajacanarias (Santa Cruz de Tenerife, Spain)
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. (C) 2016 Elsevier Ltd. All rights reserved.
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