牙科银基合金在聚乙烯吡咯烷酮碘溶液中的体外腐蚀

In vitro corrosion of dental Ag-based alloys in polyvinylpyrrolidone iodine solution.

作者信息

Ochi Morio, Endo Kazuhiko, Ohno Hiroki, Takasusuki Norio, Matsubara Hideki, Maida Takeo

机构信息

Department of Fixed Prosthodontics, School of Dentistry, Health Sciences University of Hokkaido, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan.

出版信息

Dent Mater J. 2005 Sep;24(3):422-7. doi: 10.4012/dmj.24.422.

DOI:10.4012/dmj.24.422

PMID:16279734

Abstract

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 I2 + 2e(-)-->2I- respectively.

摘要

研究了三种银基合金（Ag-Pd-Cu-Au合金、Ag-In合金和Ag-Sn-Zn合金）在聚维酮碘溶液中的腐蚀和变色行为。通过可见光分光比色法评估变色程度。进行了腐蚀电位测量以及通过X射线衍射法对腐蚀产物进行分析，以阐明腐蚀机理。三种银基合金在用作含漱液的实际浓度的聚维酮碘溶液中的腐蚀速率非常快，以至于合金在浸入10秒内就会变色并形成AgI。热力学分析以及X射线衍射法的表面分析结果表明，主要的阳极和阴极反应分别为Ag + I(-)-->AgI + e-和I2 + 2e(-)-->2I-。