Electrochemical Formation and Phase Control of Mg–Cu Alloys. Issue 1 (27th October 2015)

• Record Type: Journal Article
• Authors: Chen, Zeng; Wang, Bei; Li, Shengjun; Li, Wei; Wei, Chaochao; Jia, Xiyang; Zhang, Weifeng
• Is Part Of: ChemElectroChem. Volume 3:Issue 1(2016)
• Page Start: 165
• Page End: 171
• Publication Date: 2015-10-27
• Subjects: alloys -- copper -- electrochemical reactions -- eutectic melt -- magnesium; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201500325
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Mg–Cu alloys with different phases were electrodeposited in a molten LiCl–KCl eutectic mixture containing a small amount (0.5 mol %) of MgCl2 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 MgCu2 and Mg2 Cu phases could be obtained at −2.30 and −2.38 V (vs. Pt), respectively. Abstract : Take control : The electrochemical formation of Mg–Cu alloys is investigated in a LiCl–KCl–MgCl2 eutectic melt at 673 K by using different electrochemical techniques, including cyclic voltammetry, square‐wave voltammetry, chronoamperometry, open‐circuit potentiometry, and potentiostatic electrolysis. The results show that different Mg–Cu alloy phases, Mg2 Cu and MgCu2, can be deposited at −2.30 and −2.38 V (vs. Pt), respectively.