((1. 哈尔滨工业大学 材料科学与工程学院，哈尔滨 150001；2. 中国科学院金属研究所，沈阳 110016)
摘 要:
关键字: 镁合金；锌；微观组织；力学性能；腐蚀
（1. School of Materials Science and Technology, Harbin Institute of Technology, Harbin 150001, China;2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China）
Abstract:The effect of Zn on the microstructure, mechanical properties and corrosion properties in Hank’s solute on of as-cast Mg-Mn alloy was studied. The results indicate that the addition of Zn element can significantly refine the grain size of cast Mg-Mn alloy. When Zn content is increased up to 3% (mass fraction), the grain size of the cast alloy decreases from 700−900 μm to 50−80 µm. Meanwhile, the mechanical properties of the alloy also increase with increasing Zn content. When Zn content is 3%, the ultimate tensile strength and the yield strength are increased by 128.8 and 42.6 MPa, respectively, while the elongation is increased twice. Addition of Zn element to Mg-Mn alloy can stabilize the passivation film, which mainly contributes to the low corrosion rate of Mn-Mn-Zn alloy. However, when the Zn content is over 3%, the passivation film becomes unstable, which results in a relatively high corrosion rate.
Key words: magnesium alloy; zinc; microstructure; mechanical property; corrosion
