研究了ＬＹ１１硬铝合金硫酸法阳极氧化膜的组织结构及其性能，讨论了电解液组成和工艺条件对它们的影响。结果表明，电解液中Ｈ２ＳＯ４浓度增大，易得到较厚的多孔型氧化膜；而稀Ｈ２ＳＯ４（１０％体积比）电解液，可获得致密、无孔洞的相对较薄的氧化膜，其耐蚀性、电绝缘性和表面硬度均明显改善。工艺操作参量中，保持较低的电解液温度、合适的阳极电流密度及氧化时间，有利于膜层综合性能的提高。 The microstructure and properties of the anodic oxide film of LY11 hard aluminum alloy by sulfuric acid method were studied. The effects of electrolyte composition and process conditions on them were also discussed. The results show that the concentration of H2SO4 in the electrolyte is increased, and a thick porous oxide film is easily obtained. On the other hand, dilute H2SO4 (10% by volume) electrolyte can obtain a dense and non-porous film with a relatively thin oxide film, Sexual, electrical insulation and surface hardness are significantly improved. Process operating parameters, to maintain a lower electrolyte temperature, the appropriate anode current density and oxidation time, is conducive to the overall performance of the film to improve.