Effect of Cu Element on Microstructure and Corrosion Properties of Mg-9Al-1Zn-0.3Sn Alloy
In this work,the microstructure of Mg-9Al-1Zn-0.3Sn alloy with different Cu content was observed and analyzed by OM and SEM.At the same time,the effect of Cu element on the corrosion performance of Mg-9Al-1Zn-0.3Sn alloy was investigated by weight loss test.The results show that the corrosion resistance of Mg-9Al-1Zn-0.3Sn alloy gradually decreases with the increase of Cu content.When the content of Cu element increased from 0.12%to 0.51%,the content of the second phase increased significantly,which promoted the galvanic corrosion and increased the corrosion rate from 157.9 mm/y to 386.4mm/y.
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