Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5367265 | Applied Surface Science | 2009 | 8 Pages |
Abstract
Anodic films have been prepared on the AZ91D magnesium alloys in 1Â mol/L Na2SiO3 with 10Â vol.% silica sol addition under the constant voltage of 60Â V at room temperature by half-wave and full-wave power sources. The weight of the anodic films has been scaled by analytical balance, and the thickness has been measured by eddy current instrument. The surface morphologies, chemical composition and structure of the anodic films have been characterized by scanning electron microscopy (SEM), energy dispersion spectrometry (EDS), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the thickness and weight of the anodic films formed by the two power sources both increase with the anodizing time, and the films anodized by full-wave power source grow faster than that by half-wave one. Furthermore, we have fitted polynomial to the scattered data of the weight and thickness in a least-squares sense with MATLAB, which could express the growth process of the anodic films sufficiently. The full-wave power source is inclined to accelerate the growth of the anodic films, and the half-wave one is mainly contributed to the uniformity and fineness of the films. The anodic film consists of crystalline Mg2SiO4 and amorphous SiO2.
Related Topics
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Authors
Ximei Wang, Liqun Zhu, Weiping Li, Huicong Liu, Yihong Li,