3C用铝合金阳极氧化外观件砂眼缺陷的成因分析

摘要

It is difficult to define the cause of the surface sand-hole defects of aluminum alloy anodized exterior parts,which is a major problem in the aluminum related industry of 3C electronics.With analysis methods of metallographic microscope,scanning electron microscope (SEM)and energy dispersive spectroscopy (EDS),and combined with back-end processes observation,causes of sand-hole defect on anodized aluminium cosmetic parts are studied and checked.The results show that beside raw material damages,many reasons related to improper back-end processes of aluminium materials can also cause sad-hole defect,including zircon sand pressed-in during stamping,debris scratching during CNC,chemical remnants from pretreatment of anodic anodization and plastic film pressed-in.%铝合金阳极氧化工件表面砂眼缺陷的成因复杂且难以界定,是困扰3C电子产品用铝相关行业的一个主要难题.采用金相、扫描电镜(SEM)、X射线能谱(EDS)等检测手段,结合铝材后加工应用工艺,对铝合金阳极氧化外观件砂眼缺陷的成因进行了分析和验证.结果表明,除铝材原始损伤外,多个铝材后加工工序的处理不当也可能会导致砂眼缺陷的产生,具体原因包括冲压工后制程锆砂杂质压入、CNC工序铝屑划伤、阳极氧化前处理工序试剂残留和铝材保护膜压印等.