【摘要】 目的研究不同pH值对经过烤瓷处理过的烤瓷合金的耐腐蚀性能的影响。方法制作金合金、纯钛、钴铬合金、镍铬合金试件,常规临床烤瓷,分别置于不同的pH值溶液中,应用电化学综合测试系统和腐蚀分析软件对受试合金行动电位极化扫描,绘制合金在人工唾液中的极化曲线,获得并分析材料的自腐蚀电位(Ecorr)和腐蚀电流密度(Icorr)。结果4种合金临床烤瓷加工后在同一pH值人工唾液中自腐蚀电位负值增加的排序为金合金、纯钛、钴铬合金、镍铬合金;4种合金在pH为5.6±0.04、pH=为.6±0.04人工唾液中均比pH为6.8±0.04中自腐蚀电流密度增大,自腐蚀电位负值增大。结论纯钛与金合金耐腐蚀性能好于钴铬合金,镍铬合金,随pH值下降,非贵金属耐腐蚀性能下降明显。更多还原

【Abstract】 Objective To determine the effects of pH of 4 metal ceramic alloys which have been on porcelain firing cycle and analyze the changes of their corrosion resistance in the artificial saliva.Methods We simulated the process of firing and repolished when fabricating porcelain-fused-to-metal restoration in clinic,and then observed the electrochemical corrosion behavior of alloys in artificial saliva analyzed by polarization curves and corrosion analysis software. The data of self-corrosion potential and current density were obtained and analyzed.Results After the porcelain firing cycle,the Ecorr of 4 alloys were Au alloy>Ti>CoCr alloy>Nicr alloy,and in the artificial saliva of pH=5.6±0.04,pH=7.6±0.04,the Ecorr potential turned to be more negative than the pH=6.8±0.04,the Icorr accreted.Conclusion The corrosion resistance of Ti and Au alloy was superior to those of Nicr alloy and Cocr alloy.And In the acid artificial saliva,the corrosion resistance of base metal descended more evidently than that of Ni2Cr alloy,but worse than that of Au alloy更多还原