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以Mg粉和Zn粉为原料,采用高能球磨混粉和放电等离子烧结(SPS)的方法制备了Zn含量为0%,2%,4%,6%,8%(质量分数)的生物Mg-Zn合金,对其显微组织、力学性能和腐蚀性能进行了研究。结果表明:制备的Mg-Zn合金内部结构致密,组织分布均匀;显微硬度(HV)和抗压强度随Zn含量的增加而增加,当Zn含量为6%时达到最大值(690和379.5 MPa);模拟体液中的电化学腐蚀电位随Zn含量的增加而升高,腐蚀电流密度则降低,在6%时分别达到最大值和最小值。浸泡试验中,Zn含量为6%合金表现出最好的耐腐蚀性能,随Zn含量的增加,腐蚀形式由严重的点蚀和颗粒剥落转变为轻微的点蚀和颗粒内均匀的晶内腐蚀。
Using Mg powder and Zn powder as raw materials, bio-Mg-Zn powders with Zn content of 0%, 2%, 4%, 6% and 8% were prepared by high energy ball milling and spark plasma sintering (SPS) Zn alloy, its microstructure, mechanical properties and corrosion properties were studied. The results show that the internal structure of Mg-Zn alloy is dense and the microstructure is uniform. The microhardness (HV) and compressive strength increase with the increase of Zn content, reaching the maximum (690 and 379.5 MPa ). The electrochemical corrosion potential in simulated body fluid increased with the increase of Zn content, and the corrosion current density decreased, reaching the maximum value and the minimum value respectively at 6%. In the soaking test, the 6% Zn alloy showed the best corrosion resistance. With the increase of Zn content, the corrosion forms changed from severe pitting and particle spalling to slight pitting corrosion and uniform intragranular corrosion.