华西口腔医学杂志

• 基础研究 • 上一篇    下一篇

氟离子对2种牙科用钛合金耐腐蚀性的影响

曹博玮1 陈蕾2   

  1. 1.中南大学口腔医学院口腔修复学教研室; 2.中南大学湘雅医院口腔科, 湖南长沙410008
  • 收稿日期:2010-06-25 修回日期:2010-06-25 出版日期:2010-06-20 发布日期:2010-06-20
  • 通讯作者: 陈蕾,Tel:0731-84327494
  • 作者简介:曹博玮(1984—),男,上海人,住院医师,硕士

Effect of fluoride ion on corrosion of two dental titanium alloys

CAO Bo-wei1, CHEN Lei2   

  1. 1. Dept. of Prosthodontics, Stomatology School of Central South University, Changsha 410008, China; 2. Dept. of Stomatology, Xiangya Hospital of Central South University, Changsha 410008, China
  • Received:2010-06-25 Revised:2010-06-25 Online:2010-06-20 Published:2010-06-20
  • Contact: CHEN Lei,Tel:0731-84327494

摘要:

目的在模拟口腔环境下,探讨氟离子对Ti-12Zr合金和Ti-6Al-4V合金耐腐蚀性的影响。方法2种钛合金在含有不同浓度NaF(0%、0.05%、0.1%、0.2%)的酸性人工唾液(pH=4.0)电解池中测得极化曲线;然后将试件浸泡于恒温的实验溶液中,扫描电镜(SEM)下观察各组试件的表面形貌。结果2种钛合金在酸性人工唾液中的自腐蚀电位、极化电阻随着NaF浓度的升高而减小,自腐蚀电流密度随着NaF浓度的升高而增大;且当NaF浓度高于0.1%时2种钛合金的自腐蚀电位、极化电阻以及自腐蚀电流密度的变化明显(P<0.05);同时,扫描电镜结果显示当NaF浓度高于0.1%时2种钛合金表面开始发生严重的腐蚀;Ti-12Zr合金在NaF浓度为0.2%酸性人工唾液中的极化电阻明显高于Ti-6Al-4V合金(P<0.05)。结论氟离子可降低Ti-12Zr合金及Ti-6Al-4V合金的耐腐蚀性,且在NaF浓度高于0.1%时更为明显。

关键词: 钛合金, 氟离子, 腐蚀, 电化学

Abstract:

Objective 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. Methods 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. Results The corrosion potential (Ecorr ) and polarization resistance(Rp) values of titanium alloy decreased with the increasing of NaF concentration, while the corrosion current density(Icorr ) values increased with the increasing of NaF concentration in acidic artificial saliva. The Ecorr, Rp and Icorr values of titanium alloy changed significantly when the NaF concentration was over 0.1% (P<0.05). The Rp between Ti-12Zr alloy and Ti-6Al-4V alloy had a statistically significant difference, and the Rp of Ti -12Zr alloy was higher than that of Ti -6Al -4V alloy when the NaF concentration was 0.2%(P <0.05).Conclusion 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.

Key words: titanium alloy, fluoride ion, corrosion, electrochemical