摘要
将工业纯铝分别用硫酸和磷酸进行阳极氯化,再交流电解着色镍制作光/热转换薄膜.绪果用砒酸阳极氧化,在所采用的工艺参数范围内着色困难,而磷酸阳极氧化着色容易。用超薄切片技术及透射电镜观察膜的形貌,发现上述结果与用两种酸阳极氧化后得到的多孔性氧化膜的孔的底部直径大小有关,而与膜上部孔径关系不大。用磷酸进行阳极氧化,寻找到一种交流电解着深黑色的方法,并获得太阳光谱范围吸收率a=0.93,远红外热幅射率e=0.26的光热转换薄膜。
Aluminium sheet of commercial purity was anodized and electro-lytically coloured in nickel base solution, forming light/thermal conversion coatings. It was found that the colouring of films formed in sulphuric acid was more difficult, if not impossible, as compared with films formed in phosphoric acid. Morphology observations, using ultramicrotomy allied with transmission electronmicroscopy, suggest that the easiness of colouring is related to the diameter of the pore base, independent of the pore size in the surface layer of the film. Good solar energy absorbtive anodic films were obtained by anodizing in phosphoric acid and electrolytically colouring, with absorbance α = 0.93 at λ<2.5μm and emittance ε=0.26 at λ>2.5μm.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
1990年第2期154-159,共6页
Journal of University of Science and Technology Beijing
关键词
铝
阳极氧化
电解着色膜
光谱
anodizing, colouring, spectral selective solar energy absorptive film
