multilayered Ti/TiN coating;
metal ion release;
artificial saliva;
corrosion resistance;
D O I:
10.1016/j.corsci.2007.03.041
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
The effects of multilayered Ti/TiN or single-layered TiN films deposited by pulse-biased arc ion plating (PBAIP) on the corrosion behavior of NiTi orthodontic brackets in artificial saliva are investigated. The multilayered Ti/TiN coating is found to exhibit a greater free corrosion potential, much lower passive current density, and no breakdown up to 1.5 V. Moreover, electrochemical impedance spectroscopy (EIS) results indicate that the multilayered Ti/TiN coating has a larger impedance and lower porosity which is believed to be responsible for the exceedingly low metal ion release rate during 720 h exposure in the test solution. Visual inspection of the surfaces reveals different corrosion processes for the TiN and multilayered Ti/TiN coatings. (c) 2007 Elsevier Ltd. All rights reserved.