Characterization of oxidation products on a ZrFe2-type laves intermetallic exposed to 200(degree)C steam.

Abraham, D. P. ; Dietz, N. ; Finnegan, N.

Technical Information Center Oak Ridge Tennessee

关键词: Zirconium alloys;    Iron alloys;    Corrosion products;    Oxidation;    Auger electron spectroscopy;   

RP-ID  :  DE2001768627

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The release of radioactive elements from the stainless steel-15 wt% zirconium (SS-15Zr) metal waste form will be governed by the corrosion behavior of ZrFe(sub 2)-type intermetallics phases present in the alloy. In this article, oxidation products that formed on a ZrFe(sub 2)-type intermetallic sample exposed to 200 C steam were characterized by Auger Electron Spectroscopy (AES) and Transmission Electron Microscopy (TEM). The data revealed two oxide layers on the sample surface: an outer crystalline iron-oxide layer and an inner amorphous zirconium-rich layer believed to be zirconium oxide. Thermodynamic considerations indicate that the zirconium-rich layer formed first. The iron-oxide layer appears to have resulted from the diffusion of iron through the zirconium-rich layer to the oxide-vapor interface.