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研究了Ａｌ－３．８Ｃｕ－０．４Ｍｇ硬铝合金硫酸法阳极氧化膜的组织结构及性能。结果表明电解液中Ｈ２ＳＯ４浓度增大，易得到多孔质型的Ａｌ２Ｏ３膜，且膜层较薄；而稀Ｈ２ＳＯ４（１０ｖｏｌ％）的电解液可获得致密、无缺陷的相对较厚的膜层，其耐蚀性、电绝缘性和表面硬度均明显改善。而工艺参数中，保持较低的电解液温度和合适的电流密度及氧化时间有利于Ａｌ２Ｏ３膜综合性能的提高
The microstructure and properties of Al-3.8Cu-0.4Mg hard aluminum alloy anodic oxidation film were studied. The results show that the concentration of H2SO4 in the electrolyte is increased, and the porous Al2O3 film is easily obtained, and the film is thinner. The dense and defect-free relatively thick film can be obtained from dilute H2SO4 (10vol%) electrolyte, Corrosion resistance, electrical insulation and surface hardness were significantly improved. The process parameters, to maintain a lower electrolyte temperature and the appropriate current density and oxidation time is conducive to the overall performance of Al2O3 film to improve