- This paper describes an investigation of the corrosion behavior of Ti-based dental materials with Au, CrNi and CoCr in Ringer solution by the use of Tafel plots, Evans diagrams and EIS Nyguist diagrams. The galvanic potentials and currents obtained for various implant couples are as follows: For, Ti6Al4V/CrNi couple -0.030 V (Ag/AgCl (3 M NaCl)) and 7.94 mu A cm(-2); for Ti6Al4V/CoCr couple -0.020 V (Ag/AgCl (3 M NaCl)) and 7.08 mu A cm(-2); for Ti6Al4V/Au couple -0.020 V (Ag/AgCl (3 M NaCl)) and 5.62 mu A cm(-2). The Ti6Al4V/Au couple was found to be the most suitable one against galvanic corrosion according to both the Tafel method and mixed potential theory. The corrosion behaviors of Ti6Al4V/CoCr and Ti6Al4V/CrNi couples were found to be similar.
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