摘要
目的 :了解深冷处理技术用于处理口腔修复材料的效果及可行性。方法 :将 12个SDA_Ⅱ型中熔铸造合金试件分为 3组 ,分别为对照组、深冷处理组以及深冷处理加保温处理组 ,利用动电位极化曲线法 ,研究了SDA_Ⅱ型中熔铸造合金经深冷处理后耐腐蚀性的变化。结果 :①深冷处理可以降低SDA_Ⅱ型中熔合金的腐蚀电流 ,但对于耐点蚀性能没有影响。②从耐腐蚀性的角度而言 ,深冷处理后的保温处理对于SDA_Ⅱ型中熔合金没有明显作用。结论 :深冷处理技术是改善SDA_Ⅱ型中熔合金耐腐蚀性的有效手段 。
Objective:The purpose of this study was to investigate effects of cryotreat on the corrosion resistance of SDA-II medium melting-point castable alloy. Methods: 12 samples were divided into three groups, including the control group, the cryotreated group and the cryotreated & post-cryogenic treated group. The cryotreating process was firstly dropping the temperature from room temperature to -170℃ with dropping rate 3℃/min, maintaining -170℃ for 2hrs, and then returning to ambient temperature with an increasing rate of 1℃/min. The post-cryogenic process was maintaining the samples in 300℃ for 1hr. Finally, all samples were subjected to the electrochemical potentiodynamic polarization after immersed in the artificial saliva (ISO/TR 10271:1993(E), pH 6.8) for 24hrs at ambient temperature. The exposing area of each sample was 10 mm×10 mm. The electrochemical tests were carried out in the artificial saliva under 37℃, with the scanning rate of 20 mV/min, starting potential -200 mV below OCP and stopping current 10+{-3}A. The corrosion currents (Icorr), the pitting corrosion potentials (Eb) and the potentiodynamic polarization curves were observed using the 283 electrochemical corrosion measuring system automatically.Results: For SDA-II medium melting-point castable alloy, cryotreat reduced corrosion rate of the alloy, but had no effect on the pitting corrosion potential. As far as the post-cryogenic treatment, it didn′t affect the corrosion resistance.Conclusion: The results suggested that cryotreat was an effective procedure in enhancing the corrosion resistance of SDA-II medium melting-point castable alloy, and it may be applicable in prosthetic dentistry.
出处
《华西口腔医学杂志》
CAS
CSCD
北大核心
2002年第5期316-319,共4页
West China Journal of Stomatology
