Basal Study On Preparation Of Magnesium Alloys By Synchronous Polymetallic Electrochemical Reduction

Mg alloy are the lightest structural materials with many advantages such as high specific strength,specific stiffness,damping capacity,machinability,heatconducting good magnetic screen and easier to reycle etc. alloys are the lightest structural materials with many advantages such as high specific strength,specific stiffness,damping capacity,machinability,heatconducting good magnetic screen and easier to recycle etc.Mg alloys are widely used in several industrial fields,such as aerospace,weapon,automotiveetc.The application of Mg alloys in automobile and 3C products develops quickly.Electrochemical reduction is one of the two techniques of preparation of magnesium.A new idea to prepare Mg alloy by synchronous polymetallic electrochemical reduction was proposed in the thesis. In this paper,according the theory of molten salt electrolysis,the decomposition voltage molten salt and the electrode potential of the metals were calculated and analysised. The two routes including molten salt method and oxide process can achieve the target.Then the electrochemical reduction experimental device was designed,and on it a series of experimental studies of Mg alloys electrochemical reduction was finished.And optical microscopy(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD),and other inspect means were used to analyse the experimental results.The preparation of electrochemical reduction of oxide solid-state electrode was designed. The results show that:O2-ion can stay in CaCl2 largely, and the current intensity of CaCl2 was good.Then it was cheap, considered as an ideal electrolyte of this process.In the magnesium-aluminum alloy melte,SrCl2-CaCl2 molten salt mixture was electrolyzed to prepare Mg-Al-Sr-Ca alloy.The feasible voltage of the mixture was 4.0V,and the fitting temperature was 750℃.Sr,Ca alloying elements gathered in the dendrite/boundary of the primary phaseα-Mg in the prepared Mg-6Al-0.2Sr-0.2Ca alloy.The solid-state cathode including MgO/other oxides can be electrolysed in CaCl2?fused salt .It can make thesynchronous polymetallic electrochemical reduction of MgO/other oxides ture.