镍铬和含钛镍铬烤瓷合金的耐腐蚀性能研究

Corrosion resistance of Ni-Cr and Ni-Cr-Ti alloy in artificial saliva

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(Icor)r、极化电阻(Rp)、自腐蚀电位(Ecor)r,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(P<0.05)及粤海镍铬烤瓷合金(P>0.05);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(P<0.05)及Neotitan含钛镍铬烤瓷合金(P<0.05);粤海镍铬烤瓷合金试件的Rp高于Neotitan含钛镍铬烤瓷合金(P>0.05)。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。

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 （P〈0.05） and Yuehai Ni-Cr alloy （P〉0.05）. 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 （P〈0.05） and Neotitan Ni-Cr-Ti alloy （P〈0.05）. The R, of Yuehai Ni-Cr alloy was higher than that of Neotitan Ni-Cr-Ti alloy（P〉0.05）. 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.