Characterisation by X-ray absorption near-edge spectroscopy of KMnO4-based no-rinse conversion coatings on Al and Al alloys

No-rinse conversion coatings based on KMnO4, were applied to aluminium alloys and pure aluminium, and examined with X-ray absorption near edge spectroscopy (XANES). Some specimens were prepared beforehand and other specimens were freshly prepared immediately before testing, so that early changes in...

Full description

Saved in:
Bibliographic Details
Published in:Corrosion science 2007-04, Vol.49 (4), p.1981-1991
Main Authors: DANILIDIS, I, DAVENPORT, A. J, SYKES, J. M
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion environments
Exact sciences and technology
Metals. Metallurgy
Production techniques
Surface treatment
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:No-rinse conversion coatings based on KMnO4, were applied to aluminium alloys and pure aluminium, and examined with X-ray absorption near edge spectroscopy (XANES). Some specimens were prepared beforehand and other specimens were freshly prepared immediately before testing, so that early changes in the coatings could be studied. A significant difference in composition was found between the one-week old specimens and the fresh. The old specimens consisted predominantly of Mn oxides, while the fresh specimens contained a substantial proportion of KMnO4. When fresh specimens were rinsed with de-ionised water, soluble KMnO4 was removed and the spectrum now showed evidence for mixed oxides, but no KMnO4, like the older specimens. Monitoring of specimens after exposure to 0.5% NaCl solution showed little further change in the film.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2006.09.001