闭孔泡沫铝微弧氧化及其性能研究

Characterization of Close Cell Aluminum Foams Reinforced by Micro-arc Oxidation

泡沫铝作为一种新型功能材料,由于具有特殊的多孔结构和优异的力学性能引起了越来越多学者的关注。本工作采用微弧氧化的方法,对闭孔泡沫铝进行不同时间和电压的微弧氧化处理。采用扫描电镜观察不同电压下微弧氧化后Al2O3陶瓷膜的表面微观形貌;采用X射线衍射仪对氧化膜进行物相分析;采用电化学工作站分析微弧氧化后涂层的耐腐蚀性能;采用万能试验机对氧化后的闭孔泡沫铝进行准静态压缩实验,分析不同氧化电压和时间对其力学性能的影响。实验结果表明,微弧氧化后泡沫铝的腐蚀速度明显下降;随着氧化时间的延长,泡沫铝的力学性能也会相应提高。

As a new type of functional material,aluminum foam had attracted more and more attention because of its special porous structure and high mechanical properties.In this work,close cell aluminum foam was treated by micro-arc oxidation method at different voltage and time.SEM and X ray diffraction were utilized to observe and analysis the surface morphology and the crystalline structure of Al2 O3 coating respectively.Corrosion resistance was investigated via an electrochemical workstation and the compressive properties were evaluated by MTS.The results described that the corrosion rate of aluminum foam was decreased after the micro-arc oxidation,and the compressive properties of aluminum foams improved with the increase of oxidation time.