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Electrochemical Formation and Phase Control of Mg–Cu Alloys
Author(s) -
Chen Zeng,
Wang Bei,
Li Shengjun,
Li Wei,
Wei Chaochao,
Jia Xiyang,
Zhang Weifeng
Publication year - 2016
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201500325
Subject(s) - chronoamperometry , cyclic voltammetry , electrochemistry , eutectic system , materials science , alloy , copper , voltammetry , inorganic chemistry , scanning electron microscope , analytical chemistry (journal) , metal , phase (matter) , chemistry , electrode , metallurgy , composite material , chromatography , organic chemistry
Mg–Cu alloys with different phases were electrodeposited in a molten LiCl–KCl eutectic mixture containing a small amount (0.5 mol %) of MgCl 2 at 673 K. The electrochemical behavior of the Mg II ion and alloy formation processes were studied at inert molybdenum (Mo) and active copper (Cu) electrodes in the molten salts, respectively. Different electrochemical techniques, such as cyclic voltammetry, square‐wave voltammetry, chronoamperometry, and open‐circuit potentiometry were carried out to investigate the electrochemical formation mechanism of Mg–Cu alloys. Three signals, corresponding to the formation of metal Mg and two different Mg–Cu alloy phases, are observed when using cyclic voltammetry, square‐wave voltammetry, and open‐circuit potentiometry. Chronoamperometry studies indicate the different interfacial properties of the magnesium metal versus the Mg–Cu alloys. The results of X‐ray diffraction and scanning electron microscopy show that the MgCu 2 and Mg 2 Cu phases could be obtained at −2.30 and −2.38 V (vs. Pt), respectively.