The Study On Corrosion Behavior Of Magnesium Alloy With Rare Earth

Magnesium alloys are the ideal metal electrode materials with its high electrochemical activity, low standard electrode potential and high energy density, have a broad prospect in the field.However, it has not been widely used partly due to such problem as polarization and corrosion,So magnesium alloy anode materials for corrosion resistance and influencing factors of the research has practical value, as the study provide theoretical basis for high performance magnesium battery cathode materials.This paper mainly studies the AZ31、AZ91、AZ61 and new magnesium alloys Mg-Gd, Mg- Gd-Y when used as electrode material corrosion resistance performance and influence factors of research. The electrochemical behavior and corrosion resistance of magnesium alloy at different concentrations of Mg(ClO) solution andMgSO solution are measured by electrochemical workstation to determine the stand or fall of its corrosion resistance. Combined with its microstructure and the XRD diffraction pattern analysis of corrosion mechanism. The main conclusions are as follows :(1) The AZ31 、 AZ61 、 AZ91 magnesium electrode at different concentrations of Mg(ClO) solution, as the solution concentration increased from 1.0mol/L to 1.5mol/L, the corrosion rate increases.at the same concentrations of Mg(ClO) solution and MgSO solution. the Mg(ClO) solution in the corrosion rate is small, 1.0mol/L Mg(ClO) solution is more suitable for electrolyte.(2) The AZ31、AZ61、AZ91magnesium electrode at 1.0mol/L Mg(ClO) solution, the corrosion resistance in turn from high to low is : AZ61>AZ31>AZ91。(3) The Mg、Mg-Gd、Mg-Gd-Y new magnesium electrode at different concentrations of Mg(ClO) solution, as the solution concentration increased from 1.0mol/L to 1.5mol/L, the corrosion rate increases.at the same concentrations of Mg(ClO) solution and MgSO solution. the Mg(ClO) solution in the corrosion rate is small, 1.0mol/L Mg(ClO) solution is more suitable for electrolyte.(4) By adding rare earth elements in the pure magnesium Gd and Y formation of the new type of magnesium alloy. And to compare its corrosion resistance, we found rare earth element is added in the pure magnesium Gd and Y is not effective to improve its corrosion resistance.