摘要
目的:在模拟口腔环境下,研究钛合金在不同pH值人工唾液中的电化学腐蚀行为。方法:实验用恒电位测量极化曲线法,测定钛合金在不同pH值人工唾液中自腐蚀电位、自腐蚀电流密度、极化电阻,并与非贵金属镍铬合金、贵金属金合金进行比较分析。应用场发射扫描电子显微镜(FSEM)观察试样腐蚀前后形貌变化。结果:pH=6·8、pH=5·5时钛合金自腐蚀电流密度分别为607·06nAcm-2、2011·6nAcm-2,介于镍铬合金与金合金之间;pH=6·8、pH=5·5时钛合金极化电阻、自腐蚀电位明显高于镍铬合金,但低于金合金。随pH值降低,钛合金自腐蚀电流密度增大,极化电阻、自腐蚀电位降低。FSEM示钛合金表面在酸性条件下腐蚀更严重。结论:钛合金耐腐蚀性能好于非贵金属镍铬合金,低于贵金属金合金,随pH值下降,耐腐蚀性能下降。
Objective： To study the effect on the corrosion resistance of Ti alloy in the artificial saliva with different pH value in vitro. Methods： Compared to Ni-Cr alloy and Au alloy, electrochemical technique was used to measure the electric potential of corrosion（Ecorr）, current density of corrosion （Icorr） and polarization resistance （Rp） of Ti alloy in the artificial saliva with different pH value. After electrochemical analysis, mierostruetural and phase diffraction was examined by FSEM. Results： When pH = 6.8, Icorr of Ti alloy was 607.06nAcm^-2; When pH = 5.5, that was 2011.6nAcm^-2. Either in the acid or neutral envirenment, Icorr of Ti alloy was between that of Ni-Cr alloy and Au alloy. So were Eeorr and Rp. The result showed that when pH value reduced, Icorr of Ti alloy increased and Ecorr and Rp descended evidently. FSEM eonfermed mierostruetural and phase diffraction had been corroded more heavily in the acid environment than in the neutral environment. Conclusions： The corrosion resistance of Ti alloy was superior to that of Ni-Cr alloy, but worse than that of Au alloy. In the acid artificial saliva, the corrosion resistance of Ti alloy descended evidently.
出处
《中国生物医学工程学报》
CAS
CSCD
北大核心
2006年第2期166-169,共4页
Chinese Journal of Biomedical Engineering
基金
浙江省医药卫生专项科技计划(2002ZX041)
关键词
人工唾液
极化曲线
钛合金
腐蚀
artificial saliva
polarization curve
titanium alloy
corrosion
