研究了不旧含量Sb对AM50-Y镁合金的显微组织及在NaCl溶液腐蚀介质中腐蚀性能的影响。结果表明,加入Sb后,Sb优先与Y形成YSb相。随着Sb含量的增加,块状Al_2Y相数量减少、尺寸变短,YSb相数量增多,当Sb含量增至1%,YSb相聚集长大粗化。合金腐蚀速率和腐蚀电流密度随含Sb量的增大而增大,而氧化膜电阻和双电层电容减小,合金耐蚀性能明硅下降;当Sb含量为1%时,合金耐蚀性最差,腐蚀速率高达2.65mg·cm~（-2）·d~（-1）,比未添加Sb合金增加了近2倍。
The effects of Sb contents on the microstructure and corrosion behavior in NaCI solution of as-cast AM50-Y alloy were studied.The results show that with the addition of Sb,YSb phase forms preferentially.As Sb contents increase,the size and amount of the polygonal AI_2Y reduce,while the amount of YSb phase increases,which aggregates and increases in size when Sb content is up to 1%. The corrosion rate and corrosion current of the alloys are improved,whereas the oxide film resistance and electric double layer capacitance are reduced with the increase of Sb.The alloy with 1%Sb has the worst corrosion resistance,and the corrosion rate is up to 2.65 mg·cm~（-2）·d~（-1）,which is increased by nearly 2 times compared with the alloy without Sb addition.
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