Effects of Nd, Y on Corrosion Resistibility of Hot-rolled and Annealed AZ31 Magnesium Alloy Thin Sheets
LI Xiao1, HU Shuiping1, HAN Tianqi2
1 Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China 2 Beijing Engineering Technology Research Center of New Brazing Materials for Electronic Information, Beijing 100012, China
Abstract: To improve the corrosion resistibility of hot-rolled and annealed AZ31 magnesium alloy thin sheet, rare earth elements Nd and Y were added to commercial AZ31 magnesium alloy composition.The corrosion resistance was studied by salt spray corrosion and electrochemical corrosion experiments, and the microstructure and structure of the alloy and corrosion products were observed and analyzed by SEM and XRD.The results indicate that with addition of rare earth elements (Nd, Y), corrosion resistant oxides Nd2O3 was formed on the surface of the AZ31 Mg alloy to protect the substrate; addition of Nd and Y elements resulted in positive offset of corrosion potential and decreas of corrosion density, which retardsed the speed of corrosion and therefore improved the alloy's corrosion resistance attributed to the new corrosion resistant precipitation Al2Nd and Al2Y; comparing with only adding Nd element, addition of Nd+Y elements can further improve AZ31 alloy's corrosion resistance, among the matrix of different weight percentages, 0.5%Nd+0.5%Y was proved to be the optimized formula.
李萧, 胡水平, 韩天棋. Nd、Y对AZ31镁合金热轧退火薄板耐蚀性的影响[J]. 材料导报, 2020, 34(10): 10088-10092.
LI Xiao, HU Shuiping, HAN Tianqi. Effects of Nd, Y on Corrosion Resistibility of Hot-rolled and Annealed AZ31 Magnesium Alloy Thin Sheets. Materials Reports, 2020, 34(10): 10088-10092.
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