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Title: Investigation of Chemical Species in the Corrosion Barrier Layer on Thermal CO2 Treated AZ91D Magnesium Alloy with Lithium Nitrate

Journal Article · · JOM. Journal of the Minerals, Metals & Materials Society

A unique corrosion barrier layer, formed by thermal CO2 treatment with LiNO3 on AZ91D, was characterized to reveal the chemical species and their spatial distribution using the combination of scanning transmission electron microscopy (STEM), energy dispersive spectroscopy (EDS), and electron energy loss spectroscopy (EELS) techniques. Two distinct and spatially segregated phases were identified as Li compound(s) with MgCO3 and MgO in the surface barrier layer. Finally, based on the characterization results, it is presumed that the reaction of Mg oxide/hydroxide with LiNO3 and CO2 occurred preferentially in some local areas where Li compound(s) with MgCO3 were present, but the unreacted areas contained MgO in the surface barrier layer.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Nuclear Energy (NE), Nuclear Fuel Cycle and Supply Chain. Fuel Cycle Research and Development Program
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2462881
Journal Information:
JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Vol. 77; ISSN 1047-4838
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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