ISSN:
0142-2421
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
ac-Phosphoric acid anodizing of aluminium results in the initial formation of a featureless barrier film on the metal surface, followed by nucleation and growth of a filament structure. The rate of filament growth and filament diameter are dependent upon the anodizing temperature. Static secondary ion mass spectrometry (SSIMS) and XPS indicate that organic contamination levels on all anodized surfaces are low regardless of anodizing temperature and that contaminant levels tend to decrease as anodizing proceeds. Apart from the very intense Al+ in the positive ion spectra and the O- and OH- peaks in the negative ion spectra, SSIMS spectra were characterized by the appearance of a series of peaks from AlxOyHz fragments. Appearance of AlO+ or AlOH+ clusters in the positive ion spectra depended on the anodizing conditions. Both XPS and SSIMS confirm the presence of phosphates on the anodized surfaces but differences in results from the two types of analyses imply that unknown factors affect the concentration present.Low contaminant levels, corrosion inhibition from surface phosphates and the filamented topography developed will all affect the adhesive properties of the surface.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/sia.740150605
