不同汞合金的电流研究。

A galvanic study of different amalgams.

作者信息

Wang Chen C P, Greener E H

出版信息

J Oral Rehabil. 1977 Jan;4(1):23-7. doi: 10.1111/j.1365-2842.1977.tb00959.x.

DOI:10.1111/j.1365-2842.1977.tb00959.x

Abstract

Due to the difference in open circuit potential (OCP) versus SCE for Aristaloy amalgam (-969 mV) and Dispersalloy amalgam (-549 mV) in Ringer's solution at 25 degrees C, a galvanic cell was created with Dispersalloy amalgam as cathode and Aristaloy amalgam as anode. The galvanic corrosion current was studied as a function of time for the above cell as well as for a cell of type III dental gold (OCP is +0-5 mV) versus Aristaloy amalgam. The initial corrosion current of the latter cell (105 micronA) is about twice that for the cell of Aristaloy amalgam versus Dispersalloy amalgam (54 micronA), however, their passivating behaviour is quite similar. Also, an interrupted galvanic corrosion test simulating the oral 'make and break' situation was performed. A much higher corrosion current than the steady state was found when the two electrodes resumed contact.

摘要

在25摄氏度的林格氏溶液中，由于Aristaloy汞合金（开路电位相对于饱和甘汞电极（OCP）为-969 mV）和Dispersalloy汞合金（-549 mV）的开路电位存在差异，形成了一个以Dispersalloy汞合金为阴极、Aristaloy汞合金为阳极的原电池。研究了上述电池以及III型牙科金（开路电位为+0 - 5 mV）与Aristaloy汞合金组成的电池的原电池腐蚀电流随时间的变化情况。后一种电池的初始腐蚀电流（105微安）约为Aristaloy汞合金与Dispersalloy汞合金组成的电池（54微安）的两倍，然而，它们的钝化行为相当相似。此外，还进行了模拟口腔“开合”情况的间断原电池腐蚀试验。当两个电极重新接触时，发现腐蚀电流比稳态时高得多。