6082铝合金圆管氧化黑线缺陷原因分析

Analysis of the Causes of Black Line Defect for 6082 Aluminum Alloy Tube

运用金相分析、扫描电镜能谱测试等分析测试方法分析了6082铝合金圆管表面氧化黑线的形态,对比了黑线区域和正常区域的晶粒组织、第二相形状、分布、大小等情况,同时分析讨论了硅添加剂、夹杂、挤压死区对氧化黑线的影响。结果表明:6082铝合金表面氧化黑线部位存在粗大而数量众多的含Si、Mn颗粒以及团聚的氧化铝夹杂。通过添加合适的硅添加剂、加强精炼和过滤管控以及减少挤压死区等措施,可减少6082铝合金表面出现氧化黑线的不良率。

The morphology of black line defecting the 6082 aluminum alloy tube after anodic oxidation are analyzed by using metallographic analysis,scanning electron microscopy and energy spectrum analysis and so on in this paper.The morphology,distribution,size of the grain and the second phase in the black line region and the normal region are compared,and the effect of silicon additives,inclusions and extrusion dead zone on the black line defect are analyzed.The results show that there are large amount of Si,Mn particles and agglomerated alumina inclusions on the surface of 6082 aluminum alloy.The defect rate of oxide black line on the surface of 6082 aluminum alloy can be reduced by adopting appropriate silicon additive,strengthening refining,filtering control,and reducing extrusion dead zone.