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Electrochemical comportment of Ni-Ti alloys immersed in two types of artificial saliva.

The main objective of this work was to study the electrochemical behavior of Ni-Ti alloy immersed in two types of artificial saliva: neutral saliva (Ringer's solution, pH = 7.4) and acidic saliva (Fusayama solution pH ∼ 2.3). This study was conducted by the application of various electrochemical methods [monitoring of the corrosion potential over time; E = f(t), polarization curves; j = f(E), and electrochemical impedance spectroscopy EIS]. The overall results showed that the acidification of the saliva and/or the increase of its temperature causes the ignition of the corrosion phenomena of the Ni-Ti alloy. Indeed, the corrosion rate increases significantly with increasing temperature and the decreasing of the pH medium. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 778-784, 2017.