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研究了Zn含量(质量分数)分别为4.3%,6%和8.6%的Mg-Zn-Y-Zr合金在5%(质量分数)NaCl溶液中的质量损失腐蚀和电化学腐蚀行为,并对不同腐蚀时间的合金表面腐蚀形貌、微观组织和相成分进行了分析.结果表明,Mg-Zn-Y-Zr合金中的第二相和Zn含量可显著影响合金的耐腐蚀性能,Zn含量为4.3%的Mg-Zn-Y-Zr合金表现出良好的抗腐蚀性能.随着Zn含量的增加,合金晶界上形成了电偶腐蚀加速效应更强的W相,同时使α-Mg基体中的Zn含量增加,从而导致合金的耐蚀性能逐渐变差.
The mass loss and electrochemical corrosion behaviors of Mg-Zn-Y-Zr alloy with 5% (mass fraction) NaCl solution of 4.3%, 6% and 8.6% Zn were studied respectively. The results show that the second phase and Zn content in Mg-Zn-Y-Zr alloy can significantly affect the corrosion resistance of the alloy, and the Zn content is 4.3 % Of Mg-Zn-Y-Zr alloy showed good corrosion resistance.With the increase of Zn content, a more galvanic corrosion accelerating effect W phase formed on the grain boundary, while the α-Mg matrix Zn content increases, resulting in the corrosion resistance of the alloy gradually deteriorate.