机械合金化法制备Mg-Zn合金的耐腐蚀性能

Corrosion Performance of Mg-Zinc Alloy Prepared by Mechanical Alloying

采用高能球磨及真空热压烧结方法制备了4种不同Zn含量的Mg-Zn合金。通过在SBF模拟体液中进行动电位极化曲线测试及浸泡24h的质量损失试验,对比研究了4种Mg-Zn合金的耐蚀性。结果表明,球磨粉末与烧结的合金锭中均含有第二相Mg2Zn3、MgZn2,且Zn的含量越高,第二相含量越高。Mg-5Zn、Mg-10Zn合金的质量损失明显大于Mg-1Zn、Mg-3Zn合金,第二相Mg2Zn3、MgZn2是影响Mg-Zn合金耐蚀性的主要原因。Zn元素在腐蚀液中生成的一定量的ZnO钝化膜可以与Mg(OH)2共同保护基体,所以Mg-3Zn合金的耐蚀性在4种合金中最好。

By high energy ball milling and vacuum hot-press sintering method,the Mg-Zn alloys with four different zinc contents were prepared.Through testing potential polarization curve in SBF simulated body fluid and weight loss for 24h,the corrosion resistance of four Mg-Zn alloy was analyzed.The results show that the second phase Mg2Zn3,MgZn2 can be observed in ball milled powder and sintered alloy ingot,and with increasing in the content of zinc,the second phase is increased.Weight loss of Mg-5Zn and Mg-10Zn is the higher than that of Mg-1Zn and Mg-3Zn alloy,which is related closely with the second phase Mg2Zn3,MgZn2.Zinc element in corrosion liquid can form a certain amount of ZnO passivation film,which can protect the matrix together with the Mg（OH）2.Mg-3Zn alloy presents the desirable corrosion resistance in the four Mg-Zn alloys.