摘要
目的研究钴铬(Co-Cr)、镍铬(Ni-Cr)、镍铬铍(Ni-Cr-Be)3种非贵金属烤瓷合金在氯化钠溶液中的电化学腐蚀行为。方法铸造Co-Cr、Ni-Cr、Ni-Cr-Be 3种烤瓷合金的试件各5个,采用动电位极化法绘制合金的电极化曲线,测定合金的自腐蚀电位(Ecorr)、自腐蚀电流密度(Icorr)、钝化区间以及过钝化电位。采用扫描电子显微镜观察合金的显微组织,能谱扫描分析第二相成分。结果 Co-Cr合金的钝化膜完整、均匀、致密,耐蚀性最好;Ni-Cr合金局部的氧化膜致密性差,耐蚀性次之;Ni-Cr-Be合金中存在贫Cr、Mo的Ni-Be共晶相,耐蚀性最差。结论临床上应避免使用含Be的牙科烤瓷合金,Co-Cr合金的生物相容性优异,在牙科修复领域具有广阔的应用前景。
Objective To study the electrochemical corrosion behavior of Co-Cr,Ni-Cr and Ni-Cr-Be based porce-lain alloys in NaCl solution.Methods Five samples of each alloy were made respectively,electric polarization curve of each alloy was obtained using potentiodynamic polarization technique.Self-corrosion potential（Ecorr）,self-corrosion current density（Icorr）,passive region and transpassivation potential were tested.Microstructure and constituent was examined using scanning electron microscopy and energy dispersive spectroscopy.Results Co-Cr alloy possessed the most desirable corrosion resistance because of its integrated,homogeneous and compact passive film.The poor compactness of Ni-Cr alloy＇s passive film decreased its corrosion resistance.Ni-Cr-Be alloy exhibited the worst corrosion resistance due to the Cr and Mo depleted Ni-Be eutectic phases in the alloy.Conclusion Taking biological security into consi-deration,it is necessary to avoid the application of porcelain alloys with Be element.Co-Cr alloy with better biocompa-tibility possesses much broader prospect in the field of dental restoration.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2011年第5期485-487,493,共4页
West China Journal of Stomatology
关键词
烤瓷合金
电化学腐蚀
耐蚀性
porcelain alloy
electrochemical corrosion
corrosion resistance
