多孔阳极氧化铝形成过程的研究

Formation Process of Porous Anodic Alumina

研究了纯铝在3种不同电解液中的阳极氧化过程,通过分析阳极氧化曲线上不同阶段氧化膜的SEM照片,探讨了铝阳极氧化阻挡层的形成、阻挡层向多孔膜的转化、多孔膜的生长的过程。结果表明:多孔氧化膜不但产生于酸性溶解的电解液中,而且在非溶解性的电解液中也可以产生。提出了在阻挡层的生长过程中,氧气的析出是造成多孔产生的新观点,并从不同电解液角度进行了论证。不同的电解液体系中,氧气的析出电压不同,多孔氧化膜的孔径与电解液的种类有关。

The anodizing process of high purity aluminum in three kinds of electrolytes is investigated. The formation process of barrier membrane, the transformation from barrier-type to porous-type and the development of porous layer is analyzed by SEM micrographs of different stages in curves of anodized oxidation, The results indicate that the pore grows out not only in the acidic dissolving electrolyte but also in the indissolvable electrolyte, A new view about the porous growth is put forward, which indicates the evolution of oxygen in barrier layer results in the original porous embryo, It shows that different electrolytes can lead to different voltages of oxygen evolution and determine the pore diameter.