镍铬和含钛镍铬烤瓷合金的耐腐蚀性能研究

摘要：目的 评价2 种镍铬和1 种含钛镍铬烤瓷合金试件在人工唾液中的耐腐蚀性能。方法 采用电化学极化曲线法测定2 种镍铬和1 种含钛镍铬烤瓷合金试件的自腐蚀电流密度（Icorr ） 、极化电阻（Rp）、自腐蚀电位（Ecorr ），并得出3 种合金的极化曲线。应用场发射扫描电子显微镜（FSEM）观察实验前后试件表面形貌变化，并对数据进行单因素方差分析。结果 Bellabond 镍铬烤瓷合金的Icorr 低于Neotitan 含钛镍铬烤瓷合金（P0.05）；粤海镍铬烤瓷合金Icorr 低于Neotitan 含钛镍铬烤瓷合金（P＞0.05）。Bellabond 镍铬烤瓷合金的Rp 明显高于粤海镍铬烤瓷合金（P0.05）。Bellabond 镍铬烤瓷合金的Ecorr 低于粤海镍铬烤瓷合金（P>0.05）及Neotitan 含钛镍铬烤瓷合金（P>0.05）；Neotitan 含钛镍铬烤瓷合金的Ecorr 高于粤海镍铬烤瓷合金（P>0.05）。FSEM 显示，Bellabond 镍铬烤瓷合金表面腐蚀较粤海镍铬烤瓷合金和Neotitan 含钛镍铬烤瓷合金轻微。结论 Bellabond 镍铬烤瓷合金的耐腐蚀性较粤海镍铬烤瓷合金和Neotitan 含钛镍铬烤瓷合金优良，Neotitan含钛镍铬烤瓷合金耐腐蚀性与粤海镍铬烤瓷合金无明显差异。

关键词:牙科合金

Abstract:Objective To evaluate the corrosion resistance of two kinds of Ni-Cr alloy and Neotitan Ni-Cr-Ti alloy. Methods Electrochemical methods were used to measure the self-corrosion current density（Icorr ） , polarization resistance（Rp） and self -corrosion potential（Ecorr ） of three alloys. And the polarization curves of the three alloys were recorded at the same time. Field scanning electron microscope（FSEM） was used to observe the corrosion in the surface of the three alloys. One-way ANOVA with SPSS 11.0 software package was used for statistical analysis. Results The Icorr of Bellabond Ni-Cr alloy was lower than that of Neotitan Ni -Cr-Ti alloy（P0.05）. The Icorr of Yuehai Ni-Cr alloy was lower than that of Neotitan Ni-Cr-Ti alloy

（P＞0.05）. The Rp of Bellabond Ni-Cr alloy was higher than that of Yuehai Ni-Cr alloy（P0.05）. The Ecorr of Bellabond Ni-Cr alloy was lower than that of Yuehai Ni-Cr alloy（P>0.05） and Neotitan Ni-Cr-Ti alloy（P>0.05）. The Ecorr of Neotitan Ni-Cr-Ti alloy was higher than that of Yuehai Ni-Cr alloy（P>0.05）. FSEM showed that the corrosion in the surface of Bellabond Ni-Cr alloy was slighter than that of Yuehai Ni-Cr alloy

and Neotitan Ni-Cr-Ti alloy. Conclusion The corrosion resistance of Bellabond Ni-Cr alloy is better than that of Yuehai Ni-Cr and Neotitan Ni-Cr-Ti alloy. The corrosion resistance of Neotitan Ni-Cr-Ti alloy had no difference compared with that of Yuehai Ni-Cr alloy.