6063铝型材表面斑状缺陷成因探讨

Discussion on Causes for Spat-like Defects on Aluminium Alloy 6063 Surface

用OM、SEM观察了铝型材制品表面氧化膜的尺寸、形貌和成分 ,用CASS试验考察了铝型材制品表面氧化膜的耐蚀性 ,测定了氧化槽、封孔槽内离子浓度并讨论了它们对氧化膜质量的影响。结果表明 :铝基体中第二相析出过多 ,氧化槽、封孔槽内离子浓度控制不当都会影响氧化膜的生成质量和封孔质量。

The metallographic microstructure of aluminium alloy 6063 were characterised by OM and SEM. The corrosion resistance was tested by the CASS method. The ion concentrations in the oxidizing and sealing liquids were analysed and the effects of these ion concentrations on the quality of the anodic oxidation film were cliscussed. The resnlts show that the quality of the anodic oxidation film was affected by the second phase content in the aluminium matrix and ion concentrations in the oxidizing and sealing liquids. Incompletets sealing led to the occurrence of the spot-like defects on the alloy surface.