三种商用银钯铜金合金在林格氏液和0.1%硫化钠溶液中的腐蚀行为的体外研究。

In vitro study on the corrosion behavior of three commercial Ag-Pd-Cu-Au alloys in Ringer's and 0.1%Na2S solutions.

作者信息

Endo K, Araki Y, Kawashima I, Yamane Y, Ohno H, Matsuda K

出版信息

Higashi Nihon Shigaku Zasshi. 1989 Dec;8(2):155-63.

Abstract

The corrosion resistance of three commercial Ag-Pd-Cu-Au alloys was estimated in Ringer's and 0.1% Na2S solutions by electrochemical techniques and surface analyses. In Ringer's solution, the three alloys showed high corrosion resistance and there was no significant difference in the anodic polarization characteristics of the three alloys. In the 0.1% Na2S solution, the Alloy A which had the lowest noble metal content (Au + Pd) exhibited the highest anodic reactivity with the largest amount of corrosion product on the alloy surface. It was determined that the Ag-rich phase of Ag-Pd-Cu-Au alloy was preferentially attacked to form Ag2S corrosion product. The polarization resistance data showed that the corrosion rate for Alloy A in 0.1% Na2S solution was determined to be 500 times higher than that in Ringer's solution. The corrosion rate of the alloy in the freely corroded condition can be estimated quantitatively and precisely by measuring the polarization resistance.

摘要

通过电化学技术和表面分析，评估了三种商用Ag-Pd-Cu-Au合金在林格氏溶液和0.1% Na₂S溶液中的耐腐蚀性。在林格氏溶液中，这三种合金表现出高耐腐蚀性，且三种合金的阳极极化特性没有显著差异。在0.1% Na₂S溶液中，贵金属含量（Au + Pd）最低的合金A表现出最高的阳极反应性，合金表面有最多的腐蚀产物。确定Ag-Pd-Cu-Au合金的富银相优先受到侵蚀，形成Ag₂S腐蚀产物。极化电阻数据表明，合金A在0.1% Na₂S溶液中的腐蚀速率比在林格氏溶液中高500倍。通过测量极化电阻，可以定量且精确地估计合金在自由腐蚀条件下的腐蚀速率。