铝上的阻挡型阳极氧化膜浸泡在不同 pH 的铬酸盐/重铬酸盐溶液中时,膜的电容会不断增大,通常都把这一现象归因于阳极氧化膜的单纯的均匀减薄。然而,本研究表明,在经过这样浸泡的膜的截面超薄切片的透射电镜照片上,膜厚度的减小比由电容数据算出的结果小得多。由这两种方法获得的膜厚数据的明显差异,用膜的简单溶解是无法解释的。它很可能跟铬酸根离子在阳极氧化膜中较复杂的渗透过程有关,渗透了的膜到最终才变得松散而溶解。这一结论得到了俄歇电子能谱分析的佐证,因为在浸泡过的膜的外层发现有铬的存在。
Natural immersion of barrier-type anodic films on aluminium in chromate /dichromate solutions of varying pH leads to a progressive increase in the film capacitance which is normally attributed to simple uniform thinning of the anodie films.However,transmission electron microscopy of ultramicro- tomed sections of the immersed films shows an overall film thickness decrease which is much less than anticipated from the measured capacitance data. This significant discrepancy between thickness data is associated with a more complex penetration of chromate species within the anodic film,with the outer layer eventually becoming disaggregated and dissolved.This conclusion is supported by Auger electron spectroscopy data,which show a chromium uptake in the outer layers of the immersed films.
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