铝合金表面油胺/微弧氧化复合膜层的耐磨性

Wear Resistance of Oleylamine/micro-arc Oxidation Composite Film on Aluminum Alloy Surface

为提高铝合金表面耐磨性能,采用微弧氧化(MAO)技术在硅酸盐电解液中对2024铝合金进行表面处理,制备微弧氧化陶瓷层;然后通过浸泡法在陶瓷层表面覆盖一层油性涂层,形成复合膜层,以期提高铝合金表面耐磨性能。利用扫描电镜(SEM)和X射线衍射仪(XRD)分别观察复合膜层的表面形貌及物相组成;利用原子力显微镜AFM测试复合膜层的表面粗糙度;利用摩擦磨损试验仪分析复合膜层的摩擦系数。在SEM的观察下复合膜层比微弧氧化陶瓷层更为平整。另外,AFM的结果显示复合膜层的表面粗糙度比微弧氧化陶瓷层降低了73%左右;摩擦磨损检测显示复合膜层的摩擦系数在0.1左右,波动幅度较小,而微弧氧化陶瓷层和铝合金的摩擦系数达0.4左右,波动幅度较大。

The surface treatment of 2024 aluminum alloy was carried out in silicate electrolyte by micro-arc oxidation to improve the wear resistance of aluminum alloy surface,and the micro-arc oxidation ceramic layer were prepared.Then the coating was covered by using immersion method to form a composite film layer,which was able to improve the wear resistance of aluminum alloy.The surface morphology and phase composition of composite film were observed by SEM and XRD respectively.The surface roughness of the composite film was tested by atomic force microscope（AFM）.The friction coefficient of the composite film layer was analyzed by friction wear tester.The results showed that the composite film was smoother than the micro-arc oxide ceramic layer under the observation of SEM.In addition,the results of AFM showed that the surface roughness composite film was 73% lower than MAO layer.The friction coefficient of the composite film was about 0.1;the fluctuation range was small,and the friction coefficient of MAO ceramic layer and aluminum alloy was more and more volatile.An oil amine/micro-arc oxide composite film layer with excellent abrasion resistance was successfully prepared.