镍铬合金、钛合金及金铂合金在人工唾液中的耐腐蚀性能  

Corrosion resistance of Ni-Cr,Ti-6Al-4V,and Au-Pt alloy in artificial saliva

作　　者：刘肃[1] 周延民[1] 王晓容[1] 王瑞[1] 

机构地区：[1]吉林大学口腔医院种植中心

出　　处：《吉林大学学报（医学版）》2005年第5期774-777,共4页Journal of Jilin University：Medicine Edition

基　　金：国家"十五"攻关项目(2004BA720A27)

摘　　要：目的:评价镍铬合金(Ni-Cr)、钛合金(Ti-6Al-4V)以及金铂合金(Au-Pt)在人工唾液中的耐腐蚀性能。方法:制作Ni-Cr、Ti-6Al-4V以及Au-Pt合金3种试件共9个,每种合金各3片。采用阳极极化技术,在37℃人工唾液中测定其稳态电位(Ecorr),并记录其动电位极化曲线。用扫描电子显微镜观察试件表面形态变化,用X-射线衍射仪分析腐蚀试件表面产物的物相。结果:Ni-Cr、Ti-6Al-4V及Au-Pt合金的稳态电位分别为-115、-24和+61 mV。极化曲线表明,电位一定时(<600 mV),Au-Pt及Ti-6Al-4V合金的电流密度比Ni-Cr合金低。扫描电子显微镜观察表明,Ni-Cr合金试件表面有腐蚀痕迹,Ti-6Al-4V合金表面腐蚀痕迹不明显,Au-Pt合金表面无腐蚀痕迹。X-射线衍射图谱表明,Ni-Cr合金的腐蚀产物以Cr2O3为主,Ti-6Al-4V合金试件表面有Ti O2形成,Au-Pt合金表面无化合物生成。结论:在人工唾液中,Au-Pt及Ti-6Al-4V合金均有较好的耐腐蚀性,Ni-Cr合金的耐腐蚀性相对较差。Objective To evaluate the corrosion resistance of Ni-Cr alloy, Ti-6Al-4V alloy and Au-Pt alloy in artificial saliva. Methods Nine speciments of Ni-Cr alloy, Ti-6Al-4V alloy and Au-Pt alloy were made and they were divided into three groups （n = 3）. Then anodic polarization test was performed to measure the Ecorr and Anodic potentiondynamic polarization curves of each group. Surface changes of the alloys were observed by SEM. The products of corrosion were analyzed by X-ray diffractiometer. Results Ecorr of Ni-Cr alloy, Ti-6Al-4V alloy and Au-Pt alloy were - 115, - 24 and ＋ 61 mV. Anodic potentiondynamic polarization curves showed at the certain potential （〈600 mV）, the Ti-6Al-4V and Au-Pt alloys had lower current density than Ni-Cr alloy. SEM results showed that the corrosive marks on the surface of Ni-Cr alloy were evident and that of Ti-6Al-4V were not very evident. There were not corrosive marks on the surface of Au-Pt alloy. X-ray diffractogram showed that the corrosive product was mainly Cr chemical compound on the surface of Ni-Cr alloy and Ti chemical compound on the surface of Ti-6Al-4V alloy. The chemical compound in Au-Pt alloy was not detected. Conclusion In artificial saliva, the corrosion resistance of Au-Pt alloy and Ti-6Al-4V alloy are superior to that of Ni-Cr alloy.

关 键 词：牙科合金 电化学 唾液 人工 

分 类 号：R783.1[医药卫生—口腔医学]