恒电位电流-时间瞬变在研究牙科汞合金腐蚀中的应用。

An application of potentiostatic current--time transients to study the corrosion of dental amalgams.

作者信息

Sarkar N K, Greener E H

出版信息

J Oral Rehabil. 1977 Jan;4(1):55-64. doi: 10.1111/j.1365-2842.1977.tb00966.x.

DOI:10.1111/j.1365-2842.1977.tb00966.x

Abstract

Potentiostatic current-time transients obtained during anodic polarization of a conventional dental amalgam and its component phases have been analysed to characterize the possible electrochemical reactions involved in amalgam corrosion. These reactions involve such surface phenomena as adsorption, anodic film formation, film dissolution, etc. which are well reflected in current-time transients. The analysis of these transients from the standpoint of thermodynamics, suggests that the saline corrosion of dental amalgam may occur through the dissolution of the passive anodic films on Sn7Hg(gamma2) and Cu6Sn5 (eta') and the dissolution reaction appears to be related to the formation of tin-oxychloride.

摘要

对传统牙科汞合金及其组成相在阳极极化过程中获得的恒电位电流-时间瞬变进行了分析，以表征汞合金腐蚀中可能涉及的电化学反应。这些反应涉及吸附、阳极膜形成、膜溶解等表面现象，这些现象在电流-时间瞬变中得到了很好的反映。从热力学角度对这些瞬变进行分析表明，牙科汞合金的盐水腐蚀可能通过Sn7Hg(γ2)和Cu6Sn5(η')上的钝化阳极膜的溶解而发生，并且溶解反应似乎与氯氧化锡的形成有关。