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目的 探究Al-5％Cu合金硬质阳极氧化处理的最佳工艺.方法 采用硬质阳极氧化试验装置对Al-5％Cu合金进行硬质阳极氧化处理,并用扫描电镜和显微硬度计研究了在硫酸电解液中生成的硬质阳极氧化膜的微观组织结构、厚度及硬度.综合采用正交试验以及人工神经网络的方法,设计了三因素三水平的实验方案,研究了硫酸溶液温度、电流密度和阳极氧化时间对硬质阳极氧化膜的硬度及膜层厚度的影响.利用人工神经网络系统对Al-5％Cu合金阳极氧化的工艺参数进行了优化.结果 采用硬质阳极氧化技术可以增加Al-5％Cu合金的表面硬度.制备的氧化膜厚度较均匀,表面质量较好,硬度较高.硫酸溶液的温度是影响表面氧化膜层微观组织及硬度的主要因素.结论 Al-5％Cu合金进行硬质阳极氧化的最佳工艺条件范围为:氧化液温度-9～-7℃,电流密度4～4.8 A/dm2,氧化时间115～120 min.

The work aims to explore the optimal process of Al-5％Cu alloy.Hard anodizing tester was used to perform hard anodizing treatment to Al-5％Cu alloy.The microstructure,film thickness and hardness of hard anodic oxide film were studied by virtue of SEM and microhardness tester.Orthogonal test and the method of artificial neural network were adopted in combination to design the experimental scheme of three-factors and three-levels.The effects of oxidation solution temperature,current density and oxidation time on hardness and thickness of hard anodizing film were studied.Process parameters of Al-5％Cu alloy anodizing were optimized by means of artificial neural network system.The hard anodizing technology could increase the surface hardness of the Al-5％Cu alloy.There acquired oxide film featured in uniform thickness,favorable surface quality and high hardness.The temperature of sulfuric acid solution was the main factor influencing microstructure and hardness of surface oxidation film.Optimum conditions of Al-5％Cu alloy hard anodizing are:the oxidation solution temperature of-9～-7 ℃,current density of 4～4.8 A/dm2 and oxidation time of 115～120 min.