摘要
7A04壳体零件表面阳极氧化处理后,模锻表面存在黑斑现象。本文采用S-3700N扫描电子显微镜(SEM)、能谱分析仪(EDS)等对表面黑斑进行成因分析。结果表明:模锻表面粗糙,存在大量凹坑,模锻过程中的润滑剂或氧化皮等外来物残留于凹坑处,影响阳极氧化膜层的生成而形成表面黑斑;黑斑底部阳极氧化膜层均连续,厚度比正常区域薄,仍可以起到一定的防护作用。在系统分析基础上,提出通过严格控制表面质量和模锻工艺,可以避免此类问题的产生。
The black flecks were present in die-forging suface of 7A04 aluminum alloys shell after anodic oxidation. In this paper,the causes for the black flecks were analyzed by means of SEM and EDS. The results show that the die-forging suface was rough and with lots of pits. The black flecks resulted from foreign objects such as lubricant and oxide scale residuing in surface pits,which affected the anodizing form in die forging process. The oxide film at the bottom of black flecks was continual but thinner than normal,still playing some protection. On the base of systemic analysis,the matter can be avoided by controling the surface quality and die forging process seriously.
出处
《航天制造技术》
2010年第5期1-4,共4页
Aerospace Manufacturing Technology
关键词
阳极氧化
黑斑
表面凹坑
外来物
anodic oxidation
black flecks
surface pits
foreign objects
