3种合金在不同pH值人工唾液中电化学腐蚀的研究  

An electrochemical study on corrosion behavior of three alloys in artificial saliva with different pH

作　　者：陈志红[1] 刘丽[1] 毛英杰[1] 

机构地区：[1]浙江大学医学院附属口腔医院修复科,浙江杭州310006

出　　处：《国际口腔医学杂志》2009年第4期383-386,共4页International Journal of Stomatology

基　　金：浙江省医药卫生科学研究基金资助项目(2008A112);浙江省医药卫生专项科技计划基金资助项目(2002ZX041)

摘　　要：目的研究表面镀金的镍铬合金在不同pH值人工唾液中的腐蚀行为,并将其与镍铬合金、金合金相比较。方法采用动电位极化曲线法,比较镍铬合金镀金后在pH5.0和6.8的人工唾液中的自腐蚀电位(Ecor)r、自腐蚀电流密度(Icor)r和极化电阻(Rp)。应用场发射扫描电子显微镜(FSEM)观察试件实验前、后形貌的变化。结果镍铬合金、镀金镍铬合金和金合金试件在pH5.0和6.8的人工唾液中相比较,pH5.0时Icorr增大、Rp减小。FSEM显示镍铬合金镀金表面腐蚀在pH5.0和6.8的人工唾液中相比较,酸性人工唾液中腐蚀范围增大,但仍散在分布。结论镍铬合金、镀金镍铬合金和金合金在酸性人工唾液中较中性人工唾液中耐腐蚀性能下降。Objective To evaluate the corrosion behavior of Ni-Cr alloy with electroplated Au film in artificial saliva with different pH, compared with Ni-Cr alloy and Au alloy. Methods The electrochemical corrosion behavior of Ni-Cr alloy with electroplated Au film was evaluated by potentiodynamic polarization curve in artificial saliva （pHS.0, 6.8, respectively） to determine the corrosion potential （ECCMT）, self-corrosion current density （ICCMT） and polarization resistance （Rp）, as compared with Ni-Cr alloy and Au alloy. Microstructure and phase diffraction was examined by field scanning electron microscope （FSEM）. Results The ICCMT of three alloys in acid artificial saliva （pH5.0） was significantly higher than that in neutral artificial saliva （pH6.8）. Meanwhile, the Rp in acid artificial saliva （pH5.0） was lower than that in neutral artificial saliva （pH6.8）. The results of FSEM showed that the range of corrosion widened in acid artificial saliva on the surface of Ni-Cr alloy coating Au. Conclusion In acid medium, the corrosion resistance of three kinds of alloys decrease to a certain extent.

关 键 词：镍铬合金 镀金 金合金 电化学 腐蚀 

分 类 号：R783.1[医药卫生—口腔医学]