研究了不同含量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Al2Y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, 合金耐蚀性能明显下降; 当Sb含量为1%时, 合金耐蚀性最差, 腐蚀速率高达2.65 mg ? 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 NaCl 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 Al2Y 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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