铝合金表面耐磨复合膜的制备及其性能

针对在特殊场合对铝合金耐磨性、耐腐蚀性的高要求,结合铝合金阳极氧化工艺以及阳极氧化膜多孔的特点,在阳极氧化电解液中添加耐磨性物质n-SiC,使之进入到多孔铝合金阳极氧化膜中,达到提高耐磨性和耐腐蚀性的要求;运用正交试验法得到了添加n-SiC复合阳极氧化最佳工艺方案为:温度20℃,n-SiC添加量20mg/L,电流密度2A/dm2,氧化总时间40min。扫描电镜和X射线能谱分析结果证实n-SiC进入了氧化膜中;通过磨损试验机、盐雾腐蚀试验箱对复合阳极氧化膜的性能进行了检测,表明添加n-SiC可以提高复合阳极氧化膜的耐磨性。

Preparation and Performance of Wear-Resistant Composite Film on Aluminum Alloy

The abrasion resistant n-SiC was added in the electrolyte to oxidize aluminum alloy to prepare the composite film. The orthogonal experiment method was used to optimize the technological parameters. Results showed that the optimized process conditions were as follows: temperature 20℃., n-SiC 20 mg/L, current density 2 A/dm2, oxide general time 40 minutes. SEM and EDS results confirmed that n -SiC entered into the oxidized film. Moreover, the results from the film performance tests by abrasion tester and salt spray test indicated that the abrasion resistance of the composite film was improved by the adding of n-SiC.