机械合金化Mg-2Mn-xZn合金的电化学腐蚀性能研究

Study on Electrochemical Corrosion Properties of Mechanical Alloyed Mg-2Mn-xZn Alloy

利用高能球磨和真空热压烧结技术制备Mg-2Mn-0.5Zn、Mg-2Mn-1Zn和Mg-2Mn-2Zn镁合金,分析合金锭的致密度和显微组织。通过动电位极化和浸泡腐蚀实验,研究Mg-2Mn-xZn镁合金中Zn含量对其耐腐蚀性能的影响。结果表明,机械合金化镁合金Mg-2Mn-0.5Zn、Mg-2Mn-1Zn和Mg-2Mn-2Zn的显微组织均由α-Mg基体、β-Mn和Mg Zn2相组成。三种成分镁合金动电位极化后,均未产生明显的钝化现象,极化和浸泡腐蚀实验均表明Mg-2Mn-1Zn合金的耐腐蚀性能相对较好。

Mg-2 Mn-0.5 Zn, Mg-2 Mn-1 Zn and Mg-2 Mn-2 Zn magnesium alloys were prepared by high-energy ball grinding and vacuum hot-pressing sintering, and the density and microstructure of alloy ingots were analyzed. The effect of Zn content on the corrosion resistance of Mg-2 Mn-xZn magnesium alloy was studied by experiments of dynamic potential polarization and immersion corrosion. The results showed that the microstructure of mechanical alloyed magnesium alloys Mg-2 Mn-0.5 Zn, Mg-2 Mn-1 Zn and Mg-2 Mn-2 Zn were all made up of α-Mg matrix, β-Mn and Mg Zn2. After the dynamic potential polarization of the three components of magnesium alloys, no obvious passivation occurred. The polarization and immersion corrosion experiments all showed that the corrosion resistance of Mg-2 Mn-1 Zn alloys was relatively good.