Electrochemical behaviour of copper-nickel alloys as immobilisation matrices for the storage of fission products in CO₂-enriched synthetic groundwater

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• 作者：N. Mary^a ; C. Alemany-Dumont^a ; B. Normand^a ; ^{bernard.normand@insa-lyon.fr} ; O. Heintz^b ; V. Broudic^c ; C. Jegou^c
• 关键词：Copper alloy ; Nickel alloy ; EIS ; Passivity ; Passive film
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：30 May, 2013
• 年：2013
• 卷：98
• 期：Complete
• 页码：11-19
• 全文大小：2260 K

文摘

The surface properties of nickel and copper alloys exposed to simulated French Callovo-Oxfordien groundwater (aerated and CO₂-saturated solutions) have been evaluated from electrochemical impedance spectroscopy in conjunction with X-ray photoelectron spectroscopy.

The kinetic reactions and physical properties of the layers grown on the alloy's surfaces, change versus the Ni content in the alloys and the presence of CO₂ in the solution.

Nickel alloys retain favourable passive properties in such environments, whereas oxide products on copper alloys are insufficiently protective when formed in the absence of dissolved oxygen in the electrolyte. A maximum addition of 30 wt % of copper in nickel alloys provides good results with respect to corrosion resistance. Electrochemical measurements allow discriminating behaviour between oxide layers maintained by diffusion phenomena through layer and passive films which are maintained from migration phenomena.