Effect of fluoride and albumin concentration on the corrosion behavior of Ti-6Al-4V alloy.
The purpose of this study was to investigate the effect of fluoride and albumin concentration on the corrosion behavior of Ti-6Al-4V alloy in acid artificial saliva (pH 5/37 degrees C) using potentiodynamic polarization and linear polarization test. Chemical analyses of the surface passive film were characterized using X-ray photoelectron spectroscopy. The results showed that either the NaF (0-0.5%) or the presence of albumin (0-0.2%) in 0.1% NaF-containing media had a significant influence on the corrosion potential (E(corr)), corrosion rate (I(corr)), passive current density (I(pass)), and polarization resistance (R(p)) (p<0.01). The I(corr) and I(pass) values increased on increasing the NaF concentration, but decreased with the presence of albumin in NaF-containing media. The R(p) value decreased on increasing the NaF concentration, but increased with the presence of albumin in NaF-containing media. When the NaF concentration was higher than 0.1%, the protectiveness of TiO(2) passive film formed on Ti-6Al-4V alloy was destroyed by fluoride ions, leading to the formation of Na(2)TiF(6). The presence of albumin, regardless of the concentration, in 0.1% NaF-containing acid media improved the corrosion resistance of Ti-6Al-4V alloy.
Huang
Her-Hsiung
HH
Institute of Dental Materials, Chung Shan Medical University, Taichung 402, Taiwan. hhhuang@csmu.edu.tw
D000418:Albumins / Q000737:chemistry*; D000497:Alloys; D003343:Corrosion; D004563:Electrochemistry; D004577:Electron Probe Microanalysis; D012969:Sodium Fluoride / Q000737:chemistry*; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
D000418:Albumins; D000497:Alloys; C031462:titanium alloy (TiAl6V4); D012969:Sodium Fluoride; D014025:Titanium