铝光亮阳极氧化涂层是一种重要的航天器热控制材料.本文对硫酸电解液铝阳极氧化工艺进行了较系统的研究,发现抛光时间、阳极氧化电压、电解液温度和涂层的膜厚等对涂层光学性能有重要的影响:适度抛光可以提高涂层的太阳反射率,提高氧化电压和电解液温度可以显著增加涂层的红外发射率,膜厚对红外发射率影响较大而对太阳吸收影响并不明显.在最优工艺条件下(10V、20℃)可以制备出性能优异的铝光亮阳极氧化热控涂层.
The white anodic film on aluminium surface is a kind of important thermal control coatings for spacecraft. In this article a systematic study about
the film was carried out by anodizing aluminium foil in sulfuric acid electrolyte. The experimental results show that the optical properties
of the coating depend strongly upon the film thickness and various operation parameters: polishing time, oxidation voltage, electrolyte temperature etc.
Polishing aluminium surface can increase solar reflectance of the coating while increasing oxidation voltage and electrolyte temperature makes infrared
emittance rise rapidly. Under the optimized conditions (oxidation voltage 10V, electrolyte temperature 20℃) white anodic thermal control
coatings with excellent performance on aluminium surface can be prepared.
参考文献
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