In vitro corrosion of dental Ag-based alloys in polyvinylpyrrolidone iodine solution
In vitro corrosion of dental Ag-based alloys in polyvinylpyrrolidone iodine solution
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DOI：
10.4012/dmj.24.422
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发表时间：
2005-09-01
影响因子：
2.5
通讯作者：
Maida, T
中科院分区：
文献类型：
--
作者：
Ochi, M;Endo, K;Maida, T
研究了Ag-Pd-Cu-Au合金、Ag-In合金和Ag-Sn-Zn合金在聚乙烯吡咯烷酮碘溶液中的腐蚀和变色行为。通过可见光分光光度法评价失泽程度。通过腐蚀电位测量和腐蚀产物的X射线衍射分析，阐明了腐蚀机理。三种银基合金在聚维酮碘溶液中的腐蚀速度非常快，浸泡10 s内合金就失去光泽，形成AgI。热力学分析和X射线衍射表面分析结果表明，阳极反应和阴极反应分别为Ag+I--> AgI+e（-）和I-2+ 2 e（-）-> 2 I（-）。
The corrosion and tarnish behaviors of three Ag-based alloys (Ag-Pd-Cu-Au alloy, Ag-In alloy, and Ag-Sn-Zn alloy) in polyvinylpyrrolidone iodine (povidone-iodine) solution were examined. The degree of tarnish was evaluated by visible-ray spectrocolorimetry. Corrosion potential measurements and analyses of corrosion products by X-ray diffractometry were carried out to elucidate the corrosion mechanism, The corrosion rate of the three Ag-based alloys in povidone-iodine solution at its practical concentration used as a gargle solution was so fast that the alloys tarnished within 10 seconds of immersion with the formation of AgI. Thermodynamic consideration and the results of surface analysis by X-ray diffractometry revealed that the main anodic and cathodic reactions were Ag+I--> AgI+e(-) and I-2+2e(-)-> 2I(-) respectively.