氯离子对2种牙科常用合金耐腐蚀性的影响

发布时间：2019-04-01 07:50

【摘要】：目的:在模拟口腔环境下,探讨氯离子对钴铬合金和纯钛耐腐蚀性的影响。方法:通过对两种合金在不同NaCl(0.9%,2.0%,3.0%)浓度的中性人工唾液中进行电化学腐蚀指标测试并结合扫描电镜(SEM)扫描,观察其表面形貌。结果:钴铬合金和纯钛在三种人工唾液中的自腐蚀电位(Ecorr)的变化趋势无明显规律性,但是纯钛的自腐蚀电流密度(Icorr)明显小于钴铬合金。钴铬合金的自腐蚀电流密度随NaCl浓度的升高而增大,破裂电位值随NaCl浓度的升高而降低,氧化膜阳极破裂前的电位区间随NaCl浓度的升高而降低。纯钛的自腐蚀电流密度随Na Cl浓度的升高基本无变化,并且所有纯钛试件的极化曲线均未出现破裂电位。结论:在一定范围内,氯离子浓度的升高会导致钴铬合金腐蚀加速,而对纯钛的耐腐性无明显影响。
[Abstract]:Objective: to investigate the effect of chloride ion on corrosion resistance of Co-Cr alloy and pure titanium in simulated oral environment. Methods: the electrochemical corrosion indexes of the two alloys in neutral artificial saliva with different concentrations of NaCl (0.9%, 2.0%, 3.0%) and scanning electron microscopy (SEM) were used to observe the surface morphology of the two alloys. Results: the change trend of self-corrosion potential (Ecorr) of Co-Cr alloy and pure titanium in artificial saliva had no obvious regularity, but the corrosion current density (Icorr) of pure titanium was obviously lower than that of Co-Cr alloy. The self-corrosion current density of Co-Cr alloy increases with the increase of NaCl concentration, the breakdown potential decreases with the increase of NaCl concentration, and the potential range before rupture of oxide film anode decreases with the increase of NaCl concentration. The self-corrosion current density of pure titanium has no change with the increase of Na Cl concentration, and the polarization curves of all pure titanium samples have no rupture potential. Conclusion: the increase of chloride concentration will accelerate the corrosion of Co-Cr alloy in a certain range, but has no obvious effect on the corrosion resistance of pure titanium.
【作者单位】：中南大学湘雅医院口腔医学中心;
【分类号】：R783.1

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