Effect of aluminium alloy surface heterogeneities on anodic layer growth and properties
DOI:
https://doi.org/10.3989/revmetalm.2007.v43.i4.71Keywords:
Anodising, Aluminium, Alloying elements, Surface heterogeneities, Aluminium oxideAbstract
In the present work, X-ray photoelectron spectroscopy (XPS) is used to study sealed and unsealed anodic coatings obtained on pure-Al and on Al-Cu, Al-Mg-Si and Al-Mg alloys. In general, the sealing process is seen to produce a significant increase in the O/Al ratio in the anodic coatings. This increase is more considerable with the Al-Cu and Al-Mg alloys than with the pure Al and the Al-Mg-Si alloy, perhaps due to the greater porosity of the coatings obtained on the former. An attempt is made to establish possible relationships between anodic film characteristics and surface heterogeneities, which also act in the phase prior to anodising. According to the results of this work, these heterogeneities affect the degree of dissolution of the metallic substrate during the anodising operation.
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