Effects of pH on the electrochemical behaviour of titanium alloys for implant applications |
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Authors: | Maria E P Souza Lonetá Lima Carmo R P Lima Cecília A C Zavaglia Célia M A Freire |
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Affiliation: | (1) Department of Materials Engineering, State University of Campinas––UNICAMP, P.O. Box 6122, 13083-970 Campinas, SP, Brazil |
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Abstract: | The electrochemical behaviour of two commercial titanium alloys Ti-6Al-4 V (ASTM F136) and Ti-13Nb-13Zr (ASTM F1713) was investigated
in Ringer physiological solution at two pH values (5.5 and 7.0). The corrosion properties were examined by using electrochemical
techniques: Potentiodynamic anodic polarization, cyclic polarization and electrochemical impedance spectroscopy (EIS). The
electrochemical corrosion properties of both alloys at different conditions were measured in terms of corrosion potential
(E
corr), corrosion current density (i
corr) and passivation current density (i
pass). Equivalent electrical circuits were used to modulate EIS data, in order to characterize alloys surface and better understanding
the pH effect on the interface alloy/solution. |
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Keywords: | |
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