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铝合金壳体阳极化膜颜色异常分析
王影, 谢国君, 袁建宇, 逄锦程, 韩露
航天材料及工艺研究所,北京 100076
摘要:
铝合金壳体在阳极化处理后表面阳极化膜存在颜色异常(发黑)现象。本文通过对壳体阳极化膜表面及基体形貌观察、金相分析和成分分析对发黑的原因进行了分析。结果表明壳体阳极化膜发黑的原因是由于该区域存在成分偏析(合金含量高),导致该区域的晶粒尺度比正常区域小、耐蚀性比正常区域差,膜层微观结构与正常区域存在差异,膜层内部化合物较多,致使该区域膜层呈现黑色。
关键词:  铝合金(7A09)  阳极化  成分偏析  耐蚀性
DOI:10.12044/j.issn.1007-2330.2019.03.017
分类号:
基金项目:
Color Abnormity Analysis of Anodized Film of Aluminum Alloy Product
WANG Ying, XIE Guojun, YUAN Jianyu, PANG Jingcheng, HAN Lu
Aerospace Research Institute of Materials & Processing Technology,Beijing 100076
Abstract:
The surface of the anodized film had uneven color(blacking).In order to find out the reason,macroscopic analysis, fracture observation and other physical and chemical analysies were carried out.It is determined that the reason for the blackening of the anodized film is due to the existence of composition segregation (high alloy content),resulting in a relatively smaller grain size,worse corrosion resistance and difference of microstructure of film.There are more alloying compounds inside the film, therefore the film exhibits a black color.
Key words:  Aluminum alloy (7A09)  Anodization  Composition segregation  Corrosion resistance