【摘要】 采用气相合金化技术,在真空条件下制备了Mg-Zn二元合金,研究了合金在初始状态和热处理后的组织和电化学行为。与传统的Mg-Zn合金制备方法不同,气相合金化制备的合金中含有大量的MgZn、Mg₇Zn₃和MgZn₂金属间化合物,α-Mg的含量较低。固溶处理后,共晶界面消失,α-Mg相尺寸由100μm增加到150μm,同时在Ringer’s试液中的电化学测试结果显示电荷转移的电阻值增加,表明合金的电荷转移电阻和耐蚀性增加。经人工时效处理后,α-Mg的分布更加均匀,α-Mg相的尺寸减小到50μm左右,并且形成了新的依附于其生长的共晶组织。由于新形成的共晶组织与合金基体形成腐蚀原电池,使合金的耐蚀性减弱。更多还原

【Abstract】 Mg-Zn binary alloys fabricated by the gas-phase alloying technique under vacuum condition were investigated in the state of initial state and after heat treatment for the microstructure and electrochemical behaviors. Different from the traditional Mg-Zn alloys preparation methods, alloys prepared by gas-phase alloying have a large number of intermetallic compounds, such as MgZn, Mg₇Zn₃ and MgZn₂. After solution treatment, the boundary of the eutectic disappeared and the size of α-Mg increased from 100 μm to 150 μm. At the same time, the value of the resistance of charge transfer increased, which indicates that the resistance of the charge transfer and the corrosion resistance of the alloys increased. After artificial aging treatment, the distribution of α-Mg was more uniform and its size was reduced to about 50 μm, and there was new eutectic structure formed. The newly formed eutectic structure forms galvanic cells with the alloy matrix, which makes the corrosion resistance of the alloy weaken.更多还原