Corrosion interactions between stainless steel and lead vanado-iodoapatite nuclear waste form part II

缝隙腐蚀 腐蚀 材料科学 冶金 放射性废物 金属 电化学 纳米晶材料 核化学 化学 电极 物理化学 纳米技术
作者
Tiankai Yao,Xiaolei Guo,Penghui Lei,Yachun Wang,G. S. Frankel,Jie Lian
出处
期刊:npj Materials degradation [Nature Portfolio]
卷期号:4 (1) 被引量:7
标识
DOI:10.1038/s41529-020-0119-9
摘要

Abstract This paper studied the release of iodine from lead vanado-iodoapatite (I-APT, Pb 9.85 (VO 4 ) 6 I 1.7 ), a potential nuclear waste form for the radioactive waste element of I-129, which can be enhanced when crevice corrosion of stainless steel (SS) occurring nearby. Reference corrosion studies of I-APT were performed in different bulk solutions including DI water, 0.6 M and 6 M NaCl, and 0.1 M HNO 3 without metal crevice corrosion interactions. The localized enrichment of Cl − , one of the major consequences of SS crevice corrosion, was found to be the decisive factor that led to the enhanced release of iodine. A surface alteration layer consisting of a mixture of nanocrystalline I-APT and Cl-rich apatite (Cl-APT) formed on I-APT surface. Meanwhile, large Cl-APT crystals formed at the crevice mouth on the I-APT surface. This study reveals a new near-field corrosion mechanism for ceramic waste forms when they are exposed to aggressive local corrosive conditions created by the electrochemical reactions of nearby metals. The insight gained in this study could be beneficial for a more accurate prediction of waste form degradation.
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