Ion release and tarnishing behavior of Au and Pd based amorphous alloys in artificial sweat

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• 作者：Paola Rizzi ; Ingrid Corazzari ; Gianluca Fiore ; Ivana Fenoglio ; Bice Fubini ; Saulius Kaciulis ; Livio Battezzati
• 关键词：A. Alloy ; B. ICP&ndash ; OES ; B. XPS ; C. Amorphous structures
• 刊名：Corrosion Science
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：77
• 期：Complete
• 页码：135-142
• 全文大小：2271 K

文摘

The corrosion resistance of Pd and Au based alloys in artificial sweat was studied using ICP-AES, XPS and SEM techniques. Amorphous ribbons were incubated for 1 week: the highest ion release was found for Au-based alloys, especially Au₄₉Cu_26.9Ag_5.5Pd_2.3Si_16.3, while in Pd-based alloys it was one order of magnitude less. The Ni released from Pd_32.5Cu_7.5Ni₄₀P₂₀ was below the limit imposed by the European regulation for objects in contact with skin. Major surface modification was detected after incubation of Au₄₉Cu_26.9Ag_5.5Pd_2.3Si_16.3, with formation of a nanoporous structure related to the observed tarnishing. Glassy alloys have higher corrosion resistance than the corresponding crystalline counterparts.