Cao Bo-Wei, Chen Lei
Dept. of Prosthodontics, Stomatology School of Central South University, Changsha 410008, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2010 Jun;28(3):261-4.
To investigate the effect of fluoride concentration on the corrosion behavior of Ti-12Zr alloy and Ti-6Al-4V alloy in a simulated oral environment.
Each specimen was put into the acidic artificial saliva (pH = 4.0) with different NaF concentration (0%, 0.05%, 0.1%, 0.2%) and electrochemical experiment was carried out. Then the surface microstructure and compositions of specimen were analyzed by scanning electron microscope (SEM) after immersed in the test solution with constant temperature.
The corrosion potential (E(corr)) and polarization resistance (R(p)) values of titanium alloy decreased with the increasing of NaF concentration, while the corrosion current density (I(corr)) values increased with the increasing of NaF concentration in acidic artificial saliva. The E(corr), R(p) and I(corr) values of titanium alloy changed significantly when the NaF concentration was over 0.1% (P < 0.05). The R, between Ti-12Zr alloy and Ti-6Al-4V alloy had a statistically significant difference, and the R(p) of Ti-12Zr alloy was higher than that of Ti-6Al-4V alloy when the NaF concentration was 0.2% (P < 0.05).
The fluoride ions have a negative influence on the corrosion resistance of Ti-12Zr alloy and Ti-6Al-4V alloy, especially in the acidic artificial saliva which contained over 0.1% NaF.
研究氟浓度对Ti-12Zr合金和Ti-6Al-4V合金在模拟口腔环境中腐蚀行为的影响。
将各试样置于不同NaF浓度（0%、0.05%、0.1%、0.2%）的酸性人工唾液（pH = 4.0）中进行电化学实验。然后将试样恒温浸泡在测试溶液后，用扫描电子显微镜（SEM）分析其表面微观结构和成分。
在酸性人工唾液中，钛合金的腐蚀电位（E(corr)）和极化电阻（R(p)）值随NaF浓度的增加而降低，而腐蚀电流密度（I(corr)）值随NaF浓度的增加而升高。当NaF浓度超过0.1%时，钛合金的E(corr)、R(p)和I(corr)值发生显著变化（P < 0.05）。Ti-12Zr合金和Ti-6Al-4V合金之间的R(p)有统计学显著差异，当NaF浓度为0.2%时，Ti-12Zr合金的R(p)高于Ti-6Al-4V合金（P < 0.05）。
氟离子对Ti-12Zr合金和Ti-6Al-4V合金的耐腐蚀性有负面影响，尤其是在含超过0.1% NaF的酸性人工唾液中。
