Investigating the passivity and dissolution of a corrosion resistant Mg-33at.%Li alloy in aqueous chloride using online ICP-MS

Lifeng Hou, Massimo Raveggi, Xiao-Bo Chen, Wanqiang Xu, Kevin J. Laws, Yinghui Wei, Michael Ferry, Nick Birbilis

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Abstract

The corrosion and dissolution of a newmagnesium-lithium (Mg-Li) alloy was studied using an electrochemical flow cell coupled with inductively coupled plasma - mass spectroscopy (ICP-MS) allowing real-time spectroelectrochemical analysis. The alloy studied is a corrosion resistant Mg-33at. % Li alloy, which possesses a body centered cubic matrix and a homogenous nanostructure. A detailed investigation of the dissolution kinetics of this alloy is important for understanding the origins of its apparently high corrosion resistance. Whilst the alloy composition ratio of Mg:Li is ∼2, it was revealed that the dissolution ratio of metallic Mg:Li in 0.01 M NaCl was ∼3.4 via downstream detection of ions. The deficiency of Li detected in the downstream electrolyte via ICP-MS was attributed to the development of a persistent Li-rich surface film that forms dynamically in the open circuit condition and for applied potentials below ∼-1050 mVAg/AgCl. For potentials positive to ∼-1050 mVAg/AgCl, significant Li ion detection in solution was observed, commensurate with the alloy compositional ratio.

Original languageEnglish
Pages (from-to)C324-C329
Number of pages6
JournalJournal of the Electrochemical Society
Volume163
Issue number6
DOIs
Publication statusPublished - 2016

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